src/libFLAC/stream_decoder.c

   1 /* libFLAC - Free Lossless Audio Codec library
   2  * Copyright (C) 2000,2001,2002,2003,2004,2005,2006,2007  Josh Coalson
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * - Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  * - Redistributions in binary form must reproduce the above copyright
  12  * notice, this list of conditions and the following disclaimer in the
  13  * documentation and/or other materials provided with the distribution.
  14  *
  15  * - Neither the name of the Xiph.org Foundation nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
  23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #if HAVE_CONFIG_H
  33 #  include <config.h>
  34 #endif
  35
  36 #if defined _MSC_VER || defined __MINGW32__
  37 #include <io.h> /* for _setmode() */
  38 #include <fcntl.h> /* for _O_BINARY */
  39 #endif
  40 #if defined __CYGWIN__ || defined __EMX__
  41 #include <io.h> /* for setmode(), O_BINARY */
  42 #include <fcntl.h> /* for _O_BINARY */
  43 #endif
  44 #include <stdio.h>
  45 #include <stdlib.h> /* for malloc() */
  46 #include <string.h> /* for memset/memcpy() */
  47 #include <sys/stat.h> /* for stat() */
  48 #include <sys/types.h> /* for off_t */
  49 #if defined _MSC_VER || defined __BORLANDC__ || defined __MINGW32__
  50 #if _MSC_VER <= 1600 || defined __BORLANDC__ /* @@@ [2G limit] */
  51 #define fseeko fseek
  52 #define ftello ftell
  53 #endif
  54 #endif
  55 #include "FLAC/assert.h"
  56 #include "protected/stream_decoder.h"
  57 #include "private/bitreader.h"
  58 #include "private/bitmath.h"
  59 #include "private/cpu.h"
  60 #include "private/crc.h"
  61 #include "private/fixed.h"
  62 #include "private/format.h"
  63 #include "private/lpc.h"
  64 #include "private/md5.h"
  65 #include "private/memory.h"
  66
  67 #ifdef max
  68 #undef max
  69 #endif
  70 #define max(a,b) ((a)>(b)?(a):(b))
  71
  72 /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
  73 #ifdef _MSC_VER
  74 #define FLAC__U64L(x) x
  75 #else
  76 #define FLAC__U64L(x) x##LLU
  77 #endif
  78
  79
  80 /* technically this should be in an "export.c" but this is convenient enough */
  81 FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC =
  82 #if FLAC__HAS_OGG
  83         1
  84 #else
  85         0
  86 #endif
  87 ;
  88
  89
  90 /***********************************************************************
  91  *
  92  * Private static data
  93  *
  94  ***********************************************************************/
  95
  96 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
  97
  98 /***********************************************************************
  99  *
 100  * Private class method prototypes
 101  *
 102  ***********************************************************************/
 103
 104 static void set_defaults_(FLAC__StreamDecoder *decoder);
 105 static FILE *get_binary_stdin_(void);
 106 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
 107 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
 108 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
 109 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
 110 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
 111 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
 112 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj);
 113 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
 114 static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj);
 115 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
 116 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
 117 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
 118 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
 119 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
 120 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
 121 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
 122 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
 123 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
 124 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended);
 125 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
 126 static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data);
 127 #if FLAC__HAS_OGG
 128 static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes);
 129 static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 130 #endif
 131 static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]);
 132 static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status);
 133 static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
 134 #if FLAC__HAS_OGG
 135 static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample);
 136 #endif
 137 static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data);
 138 static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data);
 139 static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data);
 140 static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data);
 141 static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data);
 142
 143 /***********************************************************************
 144  *
 145  * Private class data
 146  *
 147  ***********************************************************************/
 148
 149 typedef struct FLAC__StreamDecoderPrivate {
 150 #if FLAC__HAS_OGG
 151         FLAC__bool is_ogg;
 152 #endif
 153         FLAC__StreamDecoderReadCallback read_callback;
 154         FLAC__StreamDecoderSeekCallback seek_callback;
 155         FLAC__StreamDecoderTellCallback tell_callback;
 156         FLAC__StreamDecoderLengthCallback length_callback;
 157         FLAC__StreamDecoderEofCallback eof_callback;
 158         FLAC__StreamDecoderWriteCallback write_callback;
 159         FLAC__StreamDecoderMetadataCallback metadata_callback;
 160         FLAC__StreamDecoderErrorCallback error_callback;
 161         /* generic 32-bit datapath: */
 162         void (*local_lpc_restore_signal)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
 163         /* generic 64-bit datapath: */
 164         void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
 165         /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
 166         void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
 167         /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit), AND order <= 8: */
 168         void (*local_lpc_restore_signal_16bit_order8)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
 169         FLAC__bool (*local_bitreader_read_rice_signed_block)(FLAC__BitReader *br, int vals[], unsigned nvals, unsigned parameter);
 170         void *client_data;
 171         FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */
 172         FLAC__BitReader *input;
 173         FLAC__int32 *output[FLAC__MAX_CHANNELS];
 174         FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
 175         FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
 176         unsigned output_capacity, output_channels;
 177         FLAC__uint32 fixed_block_size, next_fixed_block_size;
 178         FLAC__uint64 samples_decoded;
 179         FLAC__bool has_stream_info, has_seek_table;
 180         FLAC__StreamMetadata stream_info;
 181         FLAC__StreamMetadata seek_table;
 182         FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
 183         FLAC__byte *metadata_filter_ids;
 184         unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
 185         FLAC__Frame frame;
 186         FLAC__bool cached; /* true if there is a byte in lookahead */
 187         FLAC__CPUInfo cpuinfo;
 188         FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
 189         FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
 190         /* unaligned (original) pointers to allocated data */
 191         FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
 192         FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */
 193         FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */
 194         FLAC__bool is_seeking;
 195         FLAC__MD5Context md5context;
 196         FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */
 197         /* (the rest of these are only used for seeking) */
 198         FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */
 199         FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */
 200         FLAC__uint64 target_sample;
 201         unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */
 202 #if FLAC__HAS_OGG
 203         FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */
 204 #endif
 205 } FLAC__StreamDecoderPrivate;
 206
 207 /***********************************************************************
 208  *
 209  * Public static class data
 210  *
 211  ***********************************************************************/
 212
 213 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
 214         "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
 215         "FLAC__STREAM_DECODER_READ_METADATA",
 216         "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
 217         "FLAC__STREAM_DECODER_READ_FRAME",
 218         "FLAC__STREAM_DECODER_END_OF_STREAM",
 219         "FLAC__STREAM_DECODER_OGG_ERROR",
 220         "FLAC__STREAM_DECODER_SEEK_ERROR",
 221         "FLAC__STREAM_DECODER_ABORTED",
 222         "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
 223         "FLAC__STREAM_DECODER_UNINITIALIZED"
 224 };
 225
 226 FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = {
 227         "FLAC__STREAM_DECODER_INIT_STATUS_OK",
 228         "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER",
 229         "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS",
 230         "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR",
 231         "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE",
 232         "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED"
 233 };
 234
 235 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
 236         "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
 237         "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
 238         "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
 239 };
 240
 241 FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = {
 242         "FLAC__STREAM_DECODER_SEEK_STATUS_OK",
 243         "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR",
 244         "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED"
 245 };
 246
 247 FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = {
 248         "FLAC__STREAM_DECODER_TELL_STATUS_OK",
 249         "FLAC__STREAM_DECODER_TELL_STATUS_ERROR",
 250         "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED"
 251 };
 252
 253 FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = {
 254         "FLAC__STREAM_DECODER_LENGTH_STATUS_OK",
 255         "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR",
 256         "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED"
 257 };
 258
 259 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
 260         "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
 261         "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
 262 };
 263
 264 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
 265         "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
 266         "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
 267         "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH",
 268         "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM"
 269 };
 270
 271 /***********************************************************************
 272  *
 273  * Class constructor/destructor
 274  *
 275  ***********************************************************************/
 276 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void)
 277 {
 278         FLAC__StreamDecoder *decoder;
 279         unsigned i;
 280
 281         FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
 282
 283         decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder));
 284         if(decoder == 0) {
 285                 return 0;
 286         }
 287
 288         decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected));
 289         if(decoder->protected_ == 0) {
 290                 free(decoder);
 291                 return 0;
 292         }
 293
 294         decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate));
 295         if(decoder->private_ == 0) {
 296                 free(decoder->protected_);
 297                 free(decoder);
 298                 return 0;
 299         }
 300
 301         decoder->private_->input = FLAC__bitreader_new();
 302         if(decoder->private_->input == 0) {
 303                 free(decoder->private_);
 304                 free(decoder->protected_);
 305                 free(decoder);
 306                 return 0;
 307         }
 308
 309         decoder->private_->metadata_filter_ids_capacity = 16;
 310         if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
 311                 FLAC__bitreader_delete(decoder->private_->input);
 312                 free(decoder->private_);
 313                 free(decoder->protected_);
 314                 free(decoder);
 315                 return 0;
 316         }
 317
 318         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 319                 decoder->private_->output[i] = 0;
 320                 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
 321         }
 322
 323         decoder->private_->output_capacity = 0;
 324         decoder->private_->output_channels = 0;
 325         decoder->private_->has_seek_table = false;
 326
 327         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 328                 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
 329
 330         decoder->private_->file = 0;
 331
 332         set_defaults_(decoder);
 333
 334         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 335
 336         return decoder;
 337 }
 338
 339 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
 340 {
 341         unsigned i;
 342
 343         FLAC__ASSERT(0 != decoder);
 344         FLAC__ASSERT(0 != decoder->protected_);
 345         FLAC__ASSERT(0 != decoder->private_);
 346         FLAC__ASSERT(0 != decoder->private_->input);
 347
 348         (void)FLAC__stream_decoder_finish(decoder);
 349
 350         if(0 != decoder->private_->metadata_filter_ids)
 351                 free(decoder->private_->metadata_filter_ids);
 352
 353         FLAC__bitreader_delete(decoder->private_->input);
 354
 355         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 356                 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
 357
 358         free(decoder->private_);
 359         free(decoder->protected_);
 360         free(decoder);
 361 }
 362
 363 /***********************************************************************
 364  *
 365  * Public class methods
 366  *
 367  ***********************************************************************/
 368
 369 static FLAC__StreamDecoderInitStatus init_stream_internal_(
 370         FLAC__StreamDecoder *decoder,
 371         FLAC__StreamDecoderReadCallback read_callback,
 372         FLAC__StreamDecoderSeekCallback seek_callback,
 373         FLAC__StreamDecoderTellCallback tell_callback,
 374         FLAC__StreamDecoderLengthCallback length_callback,
 375         FLAC__StreamDecoderEofCallback eof_callback,
 376         FLAC__StreamDecoderWriteCallback write_callback,
 377         FLAC__StreamDecoderMetadataCallback metadata_callback,
 378         FLAC__StreamDecoderErrorCallback error_callback,
 379         void *client_data,
 380         FLAC__bool is_ogg
 381 )
 382 {
 383         FLAC__ASSERT(0 != decoder);
 384
 385         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 386                 return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
 387
 388 #if !FLAC__HAS_OGG
 389         if(is_ogg)
 390                 return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER;
 391 #endif
 392
 393         if(
 394                 0 == read_callback ||
 395                 0 == write_callback ||
 396                 0 == error_callback ||
 397                 (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback))
 398         )
 399                 return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
 400
 401 #if FLAC__HAS_OGG
 402         decoder->private_->is_ogg = is_ogg;
 403         if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect))
 404                 return decoder->protected_->state = FLAC__STREAM_DECODER_OGG_ERROR;
 405 #endif
 406
 407         /*
 408          * get the CPU info and set the function pointers
 409          */
 410         FLAC__cpu_info(&decoder->private_->cpuinfo);
 411         /* first default to the non-asm routines */
 412         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
 413         decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
 414         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
 415         decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal;
 416         decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block;
 417         /* now override with asm where appropriate */
 418 #ifndef FLAC__NO_ASM
 419         if(decoder->private_->cpuinfo.use_asm) {
 420 #ifdef FLAC__CPU_IA32
 421                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
 422 #ifdef FLAC__HAS_NASM
 423 #if 1 /*@@@@@@ OPT: not clearly faster, needs more testing */
 424                 if(decoder->private_->cpuinfo.data.ia32.bswap)
 425                         decoder->private_->local_bitreader_read_rice_signed_block = FLAC__bitreader_read_rice_signed_block_asm_ia32_bswap;
 426 #endif
 427                 if(decoder->private_->cpuinfo.data.ia32.mmx) {
 428                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 429                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
 430                         decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32_mmx;
 431                 }
 432                 else {
 433                         decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
 434                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
 435                         decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32;
 436                 }
 437 #endif
 438 #elif defined FLAC__CPU_PPC
 439                 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_PPC);
 440                 if(decoder->private_->cpuinfo.data.ppc.altivec) {
 441                         decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ppc_altivec_16;
 442                         decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ppc_altivec_16_order8;
 443                 }
 444 #endif
 445         }
 446 #endif
 447
 448         /* from here on, errors are fatal */
 449
 450         if(!FLAC__bitreader_init(decoder->private_->input, decoder->private_->cpuinfo, read_callback_, decoder)) {
 451                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 452                 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
 453         }
 454
 455         decoder->private_->read_callback = read_callback;
 456         decoder->private_->seek_callback = seek_callback;
 457         decoder->private_->tell_callback = tell_callback;
 458         decoder->private_->length_callback = length_callback;
 459         decoder->private_->eof_callback = eof_callback;
 460         decoder->private_->write_callback = write_callback;
 461         decoder->private_->metadata_callback = metadata_callback;
 462         decoder->private_->error_callback = error_callback;
 463         decoder->private_->client_data = client_data;
 464         decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
 465         decoder->private_->samples_decoded = 0;
 466         decoder->private_->has_stream_info = false;
 467         decoder->private_->cached = false;
 468
 469         decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
 470         decoder->private_->is_seeking = false;
 471
 472         decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */
 473         if(!FLAC__stream_decoder_reset(decoder)) {
 474                 /* above call sets the state for us */
 475                 return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR;
 476         }
 477
 478         return FLAC__STREAM_DECODER_INIT_STATUS_OK;
 479 }
 480
 481 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream(
 482         FLAC__StreamDecoder *decoder,
 483         FLAC__StreamDecoderReadCallback read_callback,
 484         FLAC__StreamDecoderSeekCallback seek_callback,
 485         FLAC__StreamDecoderTellCallback tell_callback,
 486         FLAC__StreamDecoderLengthCallback length_callback,
 487         FLAC__StreamDecoderEofCallback eof_callback,
 488         FLAC__StreamDecoderWriteCallback write_callback,
 489         FLAC__StreamDecoderMetadataCallback metadata_callback,
 490         FLAC__StreamDecoderErrorCallback error_callback,
 491         void *client_data
 492 )
 493 {
 494         return init_stream_internal_(
 495                 decoder,
 496                 read_callback,
 497                 seek_callback,
 498                 tell_callback,
 499                 length_callback,
 500                 eof_callback,
 501                 write_callback,
 502                 metadata_callback,
 503                 error_callback,
 504                 client_data,
 505                 /*is_ogg=*/false
 506         );
 507 }
 508
 509 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream(
 510         FLAC__StreamDecoder *decoder,
 511         FLAC__StreamDecoderReadCallback read_callback,
 512         FLAC__StreamDecoderSeekCallback seek_callback,
 513         FLAC__StreamDecoderTellCallback tell_callback,
 514         FLAC__StreamDecoderLengthCallback length_callback,
 515         FLAC__StreamDecoderEofCallback eof_callback,
 516         FLAC__StreamDecoderWriteCallback write_callback,
 517         FLAC__StreamDecoderMetadataCallback metadata_callback,
 518         FLAC__StreamDecoderErrorCallback error_callback,
 519         void *client_data
 520 )
 521 {
 522         return init_stream_internal_(
 523                 decoder,
 524                 read_callback,
 525                 seek_callback,
 526                 tell_callback,
 527                 length_callback,
 528                 eof_callback,
 529                 write_callback,
 530                 metadata_callback,
 531                 error_callback,
 532                 client_data,
 533                 /*is_ogg=*/true
 534         );
 535 }
 536
 537 static FLAC__StreamDecoderInitStatus init_FILE_internal_(
 538         FLAC__StreamDecoder *decoder,
 539         FILE *file,
 540         FLAC__StreamDecoderWriteCallback write_callback,
 541         FLAC__StreamDecoderMetadataCallback metadata_callback,
 542         FLAC__StreamDecoderErrorCallback error_callback,
 543         void *client_data,
 544         FLAC__bool is_ogg
 545 )
 546 {
 547         FLAC__ASSERT(0 != decoder);
 548         FLAC__ASSERT(0 != file);
 549
 550         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 551                 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
 552
 553         if(0 == write_callback || 0 == error_callback)
 554                 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
 555
 556         /*
 557          * To make sure that our file does not go unclosed after an error, we
 558          * must assign the FILE pointer before any further error can occur in
 559          * this routine.
 560          */
 561         if(file == stdin)
 562                 file = get_binary_stdin_(); /* just to be safe */
 563
 564         decoder->private_->file = file;
 565
 566         return init_stream_internal_(
 567                 decoder,
 568                 file_read_callback_,
 569                 decoder->private_->file == stdin? 0: file_seek_callback_,
 570                 decoder->private_->file == stdin? 0: file_tell_callback_,
 571                 decoder->private_->file == stdin? 0: file_length_callback_,
 572                 file_eof_callback_,
 573                 write_callback,
 574                 metadata_callback,
 575                 error_callback,
 576                 client_data,
 577                 is_ogg
 578         );
 579 }
 580
 581 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE(
 582         FLAC__StreamDecoder *decoder,
 583         FILE *file,
 584         FLAC__StreamDecoderWriteCallback write_callback,
 585         FLAC__StreamDecoderMetadataCallback metadata_callback,
 586         FLAC__StreamDecoderErrorCallback error_callback,
 587         void *client_data
 588 )
 589 {
 590         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
 591 }
 592
 593 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE(
 594         FLAC__StreamDecoder *decoder,
 595         FILE *file,
 596         FLAC__StreamDecoderWriteCallback write_callback,
 597         FLAC__StreamDecoderMetadataCallback metadata_callback,
 598         FLAC__StreamDecoderErrorCallback error_callback,
 599         void *client_data
 600 )
 601 {
 602         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
 603 }
 604
 605 static FLAC__StreamDecoderInitStatus init_file_internal_(
 606         FLAC__StreamDecoder *decoder,
 607         const char *filename,
 608         FLAC__StreamDecoderWriteCallback write_callback,
 609         FLAC__StreamDecoderMetadataCallback metadata_callback,
 610         FLAC__StreamDecoderErrorCallback error_callback,
 611         void *client_data,
 612         FLAC__bool is_ogg
 613 )
 614 {
 615         FILE *file;
 616
 617         FLAC__ASSERT(0 != decoder);
 618
 619         /*
 620          * To make sure that our file does not go unclosed after an error, we
 621          * have to do the same entrance checks here that are later performed
 622          * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned.
 623          */
 624         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 625                 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED;
 626
 627         if(0 == write_callback || 0 == error_callback)
 628                 return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS;
 629
 630         file = filename? fopen(filename, "rb") : stdin;
 631
 632         if(0 == file)
 633                 return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE;
 634
 635         return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg);
 636 }
 637
 638 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file(
 639         FLAC__StreamDecoder *decoder,
 640         const char *filename,
 641         FLAC__StreamDecoderWriteCallback write_callback,
 642         FLAC__StreamDecoderMetadataCallback metadata_callback,
 643         FLAC__StreamDecoderErrorCallback error_callback,
 644         void *client_data
 645 )
 646 {
 647         return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false);
 648 }
 649
 650 FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file(
 651         FLAC__StreamDecoder *decoder,
 652         const char *filename,
 653         FLAC__StreamDecoderWriteCallback write_callback,
 654         FLAC__StreamDecoderMetadataCallback metadata_callback,
 655         FLAC__StreamDecoderErrorCallback error_callback,
 656         void *client_data
 657 )
 658 {
 659         return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true);
 660 }
 661
 662 FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
 663 {
 664         FLAC__bool md5_failed = false;
 665         unsigned i;
 666
 667         FLAC__ASSERT(0 != decoder);
 668         FLAC__ASSERT(0 != decoder->private_);
 669         FLAC__ASSERT(0 != decoder->protected_);
 670
 671         if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
 672                 return true;
 673
 674         /* see the comment in FLAC__seekable_stream_decoder_reset() as to why we
 675          * always call FLAC__MD5Final()
 676          */
 677         FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context);
 678
 679         if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
 680                 free(decoder->private_->seek_table.data.seek_table.points);
 681                 decoder->private_->seek_table.data.seek_table.points = 0;
 682                 decoder->private_->has_seek_table = false;
 683         }
 684         FLAC__bitreader_free(decoder->private_->input);
 685         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
 686                 /* WATCHOUT:
 687                  * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
 688                  * output arrays have a buffer of up to 3 zeroes in front
 689                  * (at negative indices) for alignment purposes; we use 4
 690                  * to keep the data well-aligned.
 691                  */
 692                 if(0 != decoder->private_->output[i]) {
 693                         free(decoder->private_->output[i]-4);
 694                         decoder->private_->output[i] = 0;
 695                 }
 696                 if(0 != decoder->private_->residual_unaligned[i]) {
 697                         free(decoder->private_->residual_unaligned[i]);
 698                         decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
 699                 }
 700         }
 701         decoder->private_->output_capacity = 0;
 702         decoder->private_->output_channels = 0;
 703
 704 #if FLAC__HAS_OGG
 705         if(decoder->private_->is_ogg)
 706                 FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect);
 707 #endif
 708
 709         if(0 != decoder->private_->file) {
 710                 if(decoder->private_->file != stdin)
 711                         fclose(decoder->private_->file);
 712                 decoder->private_->file = 0;
 713         }
 714
 715         if(decoder->private_->do_md5_checking) {
 716                 if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16))
 717                         md5_failed = true;
 718         }
 719         decoder->private_->is_seeking = false;
 720
 721         set_defaults_(decoder);
 722
 723         decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
 724
 725         return !md5_failed;
 726 }
 727
 728 FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value)
 729 {
 730         FLAC__ASSERT(0 != decoder);
 731         FLAC__ASSERT(0 != decoder->private_);
 732         FLAC__ASSERT(0 != decoder->protected_);
 733         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 734                 return false;
 735 #if FLAC__HAS_OGG
 736         /* can't check decoder->private_->is_ogg since that's not set until init time */
 737         FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value);
 738         return true;
 739 #else
 740         (void)value;
 741         return false;
 742 #endif
 743 }
 744
 745 FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value)
 746 {
 747         FLAC__ASSERT(0 != decoder);
 748         FLAC__ASSERT(0 != decoder->protected_);
 749         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 750                 return false;
 751         decoder->protected_->md5_checking = value;
 752         return true;
 753 }
 754
 755 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 756 {
 757         FLAC__ASSERT(0 != decoder);
 758         FLAC__ASSERT(0 != decoder->private_);
 759         FLAC__ASSERT(0 != decoder->protected_);
 760         FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
 761         /* double protection */
 762         if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
 763                 return false;
 764         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 765                 return false;
 766         decoder->private_->metadata_filter[type] = true;
 767         if(type == FLAC__METADATA_TYPE_APPLICATION)
 768                 decoder->private_->metadata_filter_ids_count = 0;
 769         return true;
 770 }
 771
 772 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 773 {
 774         FLAC__ASSERT(0 != decoder);
 775         FLAC__ASSERT(0 != decoder->private_);
 776         FLAC__ASSERT(0 != decoder->protected_);
 777         FLAC__ASSERT(0 != id);
 778         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 779                 return false;
 780
 781         if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 782                 return true;
 783
 784         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 785
 786         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 787                 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2))) {
 788                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 789                         return false;
 790                 }
 791                 decoder->private_->metadata_filter_ids_capacity *= 2;
 792         }
 793
 794         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 795         decoder->private_->metadata_filter_ids_count++;
 796
 797         return true;
 798 }
 799
 800 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
 801 {
 802         unsigned i;
 803         FLAC__ASSERT(0 != decoder);
 804         FLAC__ASSERT(0 != decoder->private_);
 805         FLAC__ASSERT(0 != decoder->protected_);
 806         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 807                 return false;
 808         for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
 809                 decoder->private_->metadata_filter[i] = true;
 810         decoder->private_->metadata_filter_ids_count = 0;
 811         return true;
 812 }
 813
 814 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
 815 {
 816         FLAC__ASSERT(0 != decoder);
 817         FLAC__ASSERT(0 != decoder->private_);
 818         FLAC__ASSERT(0 != decoder->protected_);
 819         FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
 820         /* double protection */
 821         if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
 822                 return false;
 823         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 824                 return false;
 825         decoder->private_->metadata_filter[type] = false;
 826         if(type == FLAC__METADATA_TYPE_APPLICATION)
 827                 decoder->private_->metadata_filter_ids_count = 0;
 828         return true;
 829 }
 830
 831 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
 832 {
 833         FLAC__ASSERT(0 != decoder);
 834         FLAC__ASSERT(0 != decoder->private_);
 835         FLAC__ASSERT(0 != decoder->protected_);
 836         FLAC__ASSERT(0 != id);
 837         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 838                 return false;
 839
 840         if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
 841                 return true;
 842
 843         FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
 844
 845         if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
 846                 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2))) {
 847                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 848                         return false;
 849                 }
 850                 decoder->private_->metadata_filter_ids_capacity *= 2;
 851         }
 852
 853         memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
 854         decoder->private_->metadata_filter_ids_count++;
 855
 856         return true;
 857 }
 858
 859 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
 860 {
 861         FLAC__ASSERT(0 != decoder);
 862         FLAC__ASSERT(0 != decoder->private_);
 863         FLAC__ASSERT(0 != decoder->protected_);
 864         if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
 865                 return false;
 866         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
 867         decoder->private_->metadata_filter_ids_count = 0;
 868         return true;
 869 }
 870
 871 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
 872 {
 873         FLAC__ASSERT(0 != decoder);
 874         FLAC__ASSERT(0 != decoder->protected_);
 875         return decoder->protected_->state;
 876 }
 877
 878 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
 879 {
 880         return FLAC__StreamDecoderStateString[decoder->protected_->state];
 881 }
 882
 883 FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder)
 884 {
 885         FLAC__ASSERT(0 != decoder);
 886         FLAC__ASSERT(0 != decoder->protected_);
 887         return decoder->protected_->md5_checking;
 888 }
 889
 890 FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder)
 891 {
 892         FLAC__ASSERT(0 != decoder);
 893         FLAC__ASSERT(0 != decoder->protected_);
 894         return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0;
 895 }
 896
 897 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
 898 {
 899         FLAC__ASSERT(0 != decoder);
 900         FLAC__ASSERT(0 != decoder->protected_);
 901         return decoder->protected_->channels;
 902 }
 903
 904 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
 905 {
 906         FLAC__ASSERT(0 != decoder);
 907         FLAC__ASSERT(0 != decoder->protected_);
 908         return decoder->protected_->channel_assignment;
 909 }
 910
 911 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
 912 {
 913         FLAC__ASSERT(0 != decoder);
 914         FLAC__ASSERT(0 != decoder->protected_);
 915         return decoder->protected_->bits_per_sample;
 916 }
 917
 918 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
 919 {
 920         FLAC__ASSERT(0 != decoder);
 921         FLAC__ASSERT(0 != decoder->protected_);
 922         return decoder->protected_->sample_rate;
 923 }
 924
 925 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
 926 {
 927         FLAC__ASSERT(0 != decoder);
 928         FLAC__ASSERT(0 != decoder->protected_);
 929         return decoder->protected_->blocksize;
 930 }
 931
 932 FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position)
 933 {
 934         FLAC__ASSERT(0 != decoder);
 935         FLAC__ASSERT(0 != decoder->private_);
 936         FLAC__ASSERT(0 != position);
 937
 938 #if FLAC__HAS_OGG
 939         if(decoder->private_->is_ogg)
 940                 return false;
 941 #endif
 942         if(0 == decoder->private_->tell_callback)
 943                 return false;
 944         if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK)
 945                 return false;
 946         /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */
 947         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input))
 948                 return false;
 949         FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder));
 950         *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder);
 951         return true;
 952 }
 953
 954 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
 955 {
 956         FLAC__ASSERT(0 != decoder);
 957         FLAC__ASSERT(0 != decoder->private_);
 958         FLAC__ASSERT(0 != decoder->protected_);
 959
 960         decoder->private_->samples_decoded = 0;
 961         decoder->private_->do_md5_checking = false;
 962
 963 #if FLAC__HAS_OGG
 964         if(decoder->private_->is_ogg)
 965                 FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect);
 966 #endif
 967
 968         if(!FLAC__bitreader_clear(decoder->private_->input)) {
 969                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
 970                 return false;
 971         }
 972         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
 973
 974         return true;
 975 }
 976
 977 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
 978 {
 979         FLAC__ASSERT(0 != decoder);
 980         FLAC__ASSERT(0 != decoder->private_);
 981         FLAC__ASSERT(0 != decoder->protected_);
 982
 983         if(!FLAC__stream_decoder_flush(decoder)) {
 984                 /* above call sets the state for us */
 985                 return false;
 986         }
 987
 988 #if FLAC__HAS_OGG
 989         /*@@@ could go in !internal_reset_hack block below */
 990         if(decoder->private_->is_ogg)
 991                 FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect);
 992 #endif
 993
 994         /* Rewind if necessary.  If FLAC__stream_decoder_init() is calling us,
 995          * (internal_reset_hack) don't try to rewind since we are already at
 996          * the beginning of the stream and don't want to fail if the input is
 997          * not seekable.
 998          */
 999         if(!decoder->private_->internal_reset_hack) {
1000                 if(decoder->private_->file == stdin)
1001                         return false; /* can't rewind stdin, reset fails */
1002                 if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR)
1003                         return false; /* seekable and seek fails, reset fails */
1004         }
1005         else
1006                 decoder->private_->internal_reset_hack = false;
1007
1008         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
1009
1010         decoder->private_->has_stream_info = false;
1011         if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) {
1012                 free(decoder->private_->seek_table.data.seek_table.points);
1013                 decoder->private_->seek_table.data.seek_table.points = 0;
1014                 decoder->private_->has_seek_table = false;
1015         }
1016         decoder->private_->do_md5_checking = decoder->protected_->md5_checking;
1017         /*
1018          * This goes in reset() and not flush() because according to the spec, a
1019          * fixed-blocksize stream must stay that way through the whole stream.
1020          */
1021         decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0;
1022
1023         /* We initialize the FLAC__MD5Context even though we may never use it.  This
1024          * is because md5 checking may be turned on to start and then turned off if
1025          * a seek occurs.  So we init the context here and finalize it in
1026          * FLAC__stream_decoder_finish() to make sure things are always cleaned up
1027          * properly.
1028          */
1029         FLAC__MD5Init(&decoder->private_->md5context);
1030
1031         decoder->private_->first_frame_offset = 0;
1032         decoder->private_->unparseable_frame_count = 0;
1033
1034         return true;
1035 }
1036
1037 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
1038 {
1039         FLAC__bool got_a_frame;
1040         FLAC__ASSERT(0 != decoder);
1041         FLAC__ASSERT(0 != decoder->protected_);
1042
1043         while(1) {
1044                 switch(decoder->protected_->state) {
1045                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1046                                 if(!find_metadata_(decoder))
1047                                         return false; /* above function sets the status for us */
1048                                 break;
1049                         case FLAC__STREAM_DECODER_READ_METADATA:
1050                                 if(!read_metadata_(decoder))
1051                                         return false; /* above function sets the status for us */
1052                                 else
1053                                         return true;
1054                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1055                                 if(!frame_sync_(decoder))
1056                                         return true; /* above function sets the status for us */
1057                                 break;
1058                         case FLAC__STREAM_DECODER_READ_FRAME:
1059                                 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
1060                                         return false; /* above function sets the status for us */
1061                                 if(got_a_frame)
1062                                         return true; /* above function sets the status for us */
1063                                 break;
1064                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1065                         case FLAC__STREAM_DECODER_ABORTED:
1066                                 return true;
1067                         default:
1068                                 FLAC__ASSERT(0);
1069                                 return false;
1070                 }
1071         }
1072 }
1073
1074 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
1075 {
1076         FLAC__ASSERT(0 != decoder);
1077         FLAC__ASSERT(0 != decoder->protected_);
1078
1079         while(1) {
1080                 switch(decoder->protected_->state) {
1081                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1082                                 if(!find_metadata_(decoder))
1083                                         return false; /* above function sets the status for us */
1084                                 break;
1085                         case FLAC__STREAM_DECODER_READ_METADATA:
1086                                 if(!read_metadata_(decoder))
1087                                         return false; /* above function sets the status for us */
1088                                 break;
1089                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1090                         case FLAC__STREAM_DECODER_READ_FRAME:
1091                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1092                         case FLAC__STREAM_DECODER_ABORTED:
1093                                 return true;
1094                         default:
1095                                 FLAC__ASSERT(0);
1096                                 return false;
1097                 }
1098         }
1099 }
1100
1101 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
1102 {
1103         FLAC__bool dummy;
1104         FLAC__ASSERT(0 != decoder);
1105         FLAC__ASSERT(0 != decoder->protected_);
1106
1107         while(1) {
1108                 switch(decoder->protected_->state) {
1109                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1110                                 if(!find_metadata_(decoder))
1111                                         return false; /* above function sets the status for us */
1112                                 break;
1113                         case FLAC__STREAM_DECODER_READ_METADATA:
1114                                 if(!read_metadata_(decoder))
1115                                         return false; /* above function sets the status for us */
1116                                 break;
1117                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1118                                 if(!frame_sync_(decoder))
1119                                         return true; /* above function sets the status for us */
1120                                 break;
1121                         case FLAC__STREAM_DECODER_READ_FRAME:
1122                                 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
1123                                         return false; /* above function sets the status for us */
1124                                 break;
1125                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1126                         case FLAC__STREAM_DECODER_ABORTED:
1127                                 return true;
1128                         default:
1129                                 FLAC__ASSERT(0);
1130                                 return false;
1131                 }
1132         }
1133 }
1134
1135 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
1136 {
1137         FLAC__bool got_a_frame;
1138         FLAC__ASSERT(0 != decoder);
1139         FLAC__ASSERT(0 != decoder->protected_);
1140
1141         while(1) {
1142                 switch(decoder->protected_->state) {
1143                         case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
1144                         case FLAC__STREAM_DECODER_READ_METADATA:
1145                                 return false; /* above function sets the status for us */
1146                         case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
1147                                 if(!frame_sync_(decoder))
1148                                         return true; /* above function sets the status for us */
1149                                 break;
1150                         case FLAC__STREAM_DECODER_READ_FRAME:
1151                                 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
1152                                         return false; /* above function sets the status for us */
1153                                 if(got_a_frame)
1154                                         return true; /* above function sets the status for us */
1155                                 break;
1156                         case FLAC__STREAM_DECODER_END_OF_STREAM:
1157                         case FLAC__STREAM_DECODER_ABORTED:
1158                                 return true;
1159                         default:
1160                                 FLAC__ASSERT(0);
1161                                 return false;
1162                 }
1163         }
1164 }
1165
1166 FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample)
1167 {
1168         FLAC__uint64 length;
1169
1170         FLAC__ASSERT(0 != decoder);
1171
1172         if(
1173                 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA &&
1174                 decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA &&
1175                 decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC &&
1176                 decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME &&
1177                 decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM
1178         )
1179                 return false;
1180
1181         if(0 == decoder->private_->seek_callback)
1182                 return false;
1183
1184         FLAC__ASSERT(decoder->private_->seek_callback);
1185         FLAC__ASSERT(decoder->private_->tell_callback);
1186         FLAC__ASSERT(decoder->private_->length_callback);
1187         FLAC__ASSERT(decoder->private_->eof_callback);
1188
1189         if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder))
1190                 return false;
1191
1192         decoder->private_->is_seeking = true;
1193
1194         /* turn off md5 checking if a seek is attempted */
1195         decoder->private_->do_md5_checking = false;
1196
1197         /* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */
1198         if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) {
1199                 decoder->private_->is_seeking = false;
1200                 return false;
1201         }
1202
1203         /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */
1204         if(
1205                 decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA ||
1206                 decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA
1207         ) {
1208                 if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) {
1209                         /* above call sets the state for us */
1210                         decoder->private_->is_seeking = false;
1211                         return false;
1212                 }
1213                 /* check this again in case we didn't know total_samples the first time */
1214                 if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) {
1215                         decoder->private_->is_seeking = false;
1216                         return false;
1217                 }
1218         }
1219
1220         {
1221                 const FLAC__bool ok =
1222 #if FLAC__HAS_OGG
1223                         decoder->private_->is_ogg?
1224                         seek_to_absolute_sample_ogg_(decoder, length, sample) :
1225 #endif
1226                         seek_to_absolute_sample_(decoder, length, sample)
1227                 ;
1228                 decoder->private_->is_seeking = false;
1229                 return ok;
1230         }
1231 }
1232
1233 /***********************************************************************
1234  *
1235  * Protected class methods
1236  *
1237  ***********************************************************************/
1238
1239 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
1240 {
1241         FLAC__ASSERT(0 != decoder);
1242         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1243         FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7));
1244         return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8;
1245 }
1246
1247 /***********************************************************************
1248  *
1249  * Private class methods
1250  *
1251  ***********************************************************************/
1252
1253 void set_defaults_(FLAC__StreamDecoder *decoder)
1254 {
1255 #if FLAC__HAS_OGG
1256         decoder->private_->is_ogg = false;
1257 #endif
1258         decoder->private_->read_callback = 0;
1259         decoder->private_->seek_callback = 0;
1260         decoder->private_->tell_callback = 0;
1261         decoder->private_->length_callback = 0;
1262         decoder->private_->eof_callback = 0;
1263         decoder->private_->write_callback = 0;
1264         decoder->private_->metadata_callback = 0;
1265         decoder->private_->error_callback = 0;
1266         decoder->private_->client_data = 0;
1267
1268         memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
1269         decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
1270         decoder->private_->metadata_filter_ids_count = 0;
1271
1272         decoder->protected_->md5_checking = false;
1273
1274 #if FLAC__HAS_OGG
1275         FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect);
1276 #endif
1277 }
1278
1279 /*
1280  * This will forcibly set stdin to binary mode (for OSes that require it)
1281  */
1282 FILE *get_binary_stdin_(void)
1283 {
1284         /* if something breaks here it is probably due to the presence or
1285          * absence of an underscore before the identifiers 'setmode',
1286          * 'fileno', and/or 'O_BINARY'; check your system header files.
1287          */
1288 #if defined _MSC_VER || defined __MINGW32__
1289         _setmode(_fileno(stdin), _O_BINARY);
1290 #elif defined __CYGWIN__ || defined __EMX__
1291         /* almost certainly not needed for any modern Cygwin, but let's be safe... */
1292         setmode(_fileno(stdin), _O_BINARY);
1293 #endif
1294
1295         return stdin;
1296 }
1297
1298 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
1299 {
1300         unsigned i;
1301         FLAC__int32 *tmp;
1302
1303         if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
1304                 return true;
1305
1306         /* simply using realloc() is not practical because the number of channels may change mid-stream */
1307
1308         for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
1309                 if(0 != decoder->private_->output[i]) {
1310                         free(decoder->private_->output[i]-4);
1311                         decoder->private_->output[i] = 0;
1312                 }
1313                 if(0 != decoder->private_->residual_unaligned[i]) {
1314                         free(decoder->private_->residual_unaligned[i]);
1315                         decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
1316                 }
1317         }
1318
1319         for(i = 0; i < channels; i++) {
1320                 /* WATCHOUT:
1321                  * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
1322                  * output arrays have a buffer of up to 3 zeroes in front
1323                  * (at negative indices) for alignment purposes; we use 4
1324                  * to keep the data well-aligned.
1325                  */
1326                 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
1327                 if(tmp == 0) {
1328                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1329                         return false;
1330                 }
1331                 memset(tmp, 0, sizeof(FLAC__int32)*4);
1332                 decoder->private_->output[i] = tmp + 4;
1333
1334                 /* WATCHOUT:
1335                  * minimum of quadword alignment for PPC vector optimizations is REQUIRED:
1336                  */
1337                 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
1338                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1339                         return false;
1340                 }
1341         }
1342
1343         decoder->private_->output_capacity = size;
1344         decoder->private_->output_channels = channels;
1345
1346         return true;
1347 }
1348
1349 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
1350 {
1351         unsigned i;
1352
1353         FLAC__ASSERT(0 != decoder);
1354         FLAC__ASSERT(0 != decoder->private_);
1355
1356         for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
1357                 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
1358                         return true;
1359
1360         return false;
1361 }
1362
1363 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
1364 {
1365         FLAC__uint32 x;
1366         unsigned i, id;
1367         FLAC__bool first = true;
1368
1369         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1370
1371         for(i = id = 0; i < 4; ) {
1372                 if(decoder->private_->cached) {
1373                         x = (FLAC__uint32)decoder->private_->lookahead;
1374                         decoder->private_->cached = false;
1375                 }
1376                 else {
1377                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1378                                 return false; /* read_callback_ sets the state for us */
1379                 }
1380                 if(x == FLAC__STREAM_SYNC_STRING[i]) {
1381                         first = true;
1382                         i++;
1383                         id = 0;
1384                         continue;
1385                 }
1386                 if(x == ID3V2_TAG_[id]) {
1387                         id++;
1388                         i = 0;
1389                         if(id == 3) {
1390                                 if(!skip_id3v2_tag_(decoder))
1391                                         return false; /* skip_id3v2_tag_ sets the state for us */
1392                         }
1393                         continue;
1394                 }
1395                 id = 0;
1396                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1397                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1398                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1399                                 return false; /* read_callback_ sets the state for us */
1400
1401                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1402                         /* else we have to check if the second byte is the end of a sync code */
1403                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1404                                 decoder->private_->lookahead = (FLAC__byte)x;
1405                                 decoder->private_->cached = true;
1406                         }
1407                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1408                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1409                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1410                                 return true;
1411                         }
1412                 }
1413                 i = 0;
1414                 if(first) {
1415                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1416                         first = false;
1417                 }
1418         }
1419
1420         decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
1421         return true;
1422 }
1423
1424 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
1425 {
1426         FLAC__bool is_last;
1427         FLAC__uint32 i, x, type, length;
1428
1429         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1430
1431         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN))
1432                 return false; /* read_callback_ sets the state for us */
1433         is_last = x? true : false;
1434
1435         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN))
1436                 return false; /* read_callback_ sets the state for us */
1437
1438         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN))
1439                 return false; /* read_callback_ sets the state for us */
1440
1441         if(type == FLAC__METADATA_TYPE_STREAMINFO) {
1442                 if(!read_metadata_streaminfo_(decoder, is_last, length))
1443                         return false;
1444
1445                 decoder->private_->has_stream_info = true;
1446                 if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16))
1447                         decoder->private_->do_md5_checking = false;
1448                 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback)
1449                         decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
1450         }
1451         else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
1452                 if(!read_metadata_seektable_(decoder, is_last, length))
1453                         return false;
1454
1455                 decoder->private_->has_seek_table = true;
1456                 if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback)
1457                         decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
1458         }
1459         else {
1460                 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
1461                 unsigned real_length = length;
1462                 FLAC__StreamMetadata block;
1463
1464                 block.is_last = is_last;
1465                 block.type = (FLAC__MetadataType)type;
1466                 block.length = length;
1467
1468                 if(type == FLAC__METADATA_TYPE_APPLICATION) {
1469                         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))
1470                                 return false; /* read_callback_ sets the state for us */
1471
1472                         real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
1473
1474                         if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
1475                                 skip_it = !skip_it;
1476                 }
1477
1478                 if(skip_it) {
1479                         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1480                                 return false; /* read_callback_ sets the state for us */
1481                 }
1482                 else {
1483                         switch(type) {
1484                                 case FLAC__METADATA_TYPE_PADDING:
1485                                         /* skip the padding bytes */
1486                                         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length))
1487                                                 return false; /* read_callback_ sets the state for us */
1488                                         break;
1489                                 case FLAC__METADATA_TYPE_APPLICATION:
1490                                         /* remember, we read the ID already */
1491                                         if(real_length > 0) {
1492                                                 if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) {
1493                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1494                                                         return false;
1495                                                 }
1496                                                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length))
1497                                                         return false; /* read_callback_ sets the state for us */
1498                                         }
1499                                         else
1500                                                 block.data.application.data = 0;
1501                                         break;
1502                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1503                                         if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment))
1504                                                 return false;
1505                                         break;
1506                                 case FLAC__METADATA_TYPE_CUESHEET:
1507                                         if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
1508                                                 return false;
1509                                         break;
1510                                 case FLAC__METADATA_TYPE_PICTURE:
1511                                         if(!read_metadata_picture_(decoder, &block.data.picture))
1512                                                 return false;
1513                                         break;
1514                                 case FLAC__METADATA_TYPE_STREAMINFO:
1515                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1516                                         FLAC__ASSERT(0);
1517                                         break;
1518                                 default:
1519                                         if(real_length > 0) {
1520                                                 if(0 == (block.data.unknown.data = (FLAC__byte*)malloc(real_length))) {
1521                                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1522                                                         return false;
1523                                                 }
1524                                                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length))
1525                                                         return false; /* read_callback_ sets the state for us */
1526                                         }
1527                                         else
1528                                                 block.data.unknown.data = 0;
1529                                         break;
1530                         }
1531                         if(!decoder->private_->is_seeking && decoder->private_->metadata_callback)
1532                                 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1533
1534                         /* now we have to free any malloc'ed data in the block */
1535                         switch(type) {
1536                                 case FLAC__METADATA_TYPE_PADDING:
1537                                         break;
1538                                 case FLAC__METADATA_TYPE_APPLICATION:
1539                                         if(0 != block.data.application.data)
1540                                                 free(block.data.application.data);
1541                                         break;
1542                                 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1543                                         if(0 != block.data.vorbis_comment.vendor_string.entry)
1544                                                 free(block.data.vorbis_comment.vendor_string.entry);
1545                                         if(block.data.vorbis_comment.num_comments > 0)
1546                                                 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1547                                                         if(0 != block.data.vorbis_comment.comments[i].entry)
1548                                                                 free(block.data.vorbis_comment.comments[i].entry);
1549                                         if(0 != block.data.vorbis_comment.comments)
1550                                                 free(block.data.vorbis_comment.comments);
1551                                         break;
1552                                 case FLAC__METADATA_TYPE_CUESHEET:
1553                                         if(block.data.cue_sheet.num_tracks > 0)
1554                                                 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1555                                                         if(0 != block.data.cue_sheet.tracks[i].indices)
1556                                                                 free(block.data.cue_sheet.tracks[i].indices);
1557                                         if(0 != block.data.cue_sheet.tracks)
1558                                                 free(block.data.cue_sheet.tracks);
1559                                         break;
1560                                 case FLAC__METADATA_TYPE_PICTURE:
1561                                         if(0 != block.data.picture.mime_type)
1562                                                 free(block.data.picture.mime_type);
1563                                         if(0 != block.data.picture.description)
1564                                                 free(block.data.picture.description);
1565                                         if(0 != block.data.picture.data)
1566                                                 free(block.data.picture.data);
1567                                         break;
1568                                 case FLAC__METADATA_TYPE_STREAMINFO:
1569                                 case FLAC__METADATA_TYPE_SEEKTABLE:
1570                                         FLAC__ASSERT(0);
1571                                 default:
1572                                         if(0 != block.data.unknown.data)
1573                                                 free(block.data.unknown.data);
1574                                         break;
1575                         }
1576                 }
1577         }
1578
1579         if(is_last) {
1580                 /* if this fails, it's OK, it's just a hint for the seek routine */
1581                 if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset))
1582                         decoder->private_->first_frame_offset = 0;
1583                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1584         }
1585
1586         return true;
1587 }
1588
1589 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1590 {
1591         FLAC__uint32 x;
1592         unsigned bits, used_bits = 0;
1593
1594         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1595
1596         decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1597         decoder->private_->stream_info.is_last = is_last;
1598         decoder->private_->stream_info.length = length;
1599
1600         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1601         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits))
1602                 return false; /* read_callback_ sets the state for us */
1603         decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1604         used_bits += bits;
1605
1606         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1607         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN))
1608                 return false; /* read_callback_ sets the state for us */
1609         decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1610         used_bits += bits;
1611
1612         bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1613         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN))
1614                 return false; /* read_callback_ sets the state for us */
1615         decoder->private_->stream_info.data.stream_info.min_framesize = x;
1616         used_bits += bits;
1617
1618         bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1619         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN))
1620                 return false; /* read_callback_ sets the state for us */
1621         decoder->private_->stream_info.data.stream_info.max_framesize = x;
1622         used_bits += bits;
1623
1624         bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1625         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN))
1626                 return false; /* read_callback_ sets the state for us */
1627         decoder->private_->stream_info.data.stream_info.sample_rate = x;
1628         used_bits += bits;
1629
1630         bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1631         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN))
1632                 return false; /* read_callback_ sets the state for us */
1633         decoder->private_->stream_info.data.stream_info.channels = x+1;
1634         used_bits += bits;
1635
1636         bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1637         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN))
1638                 return false; /* read_callback_ sets the state for us */
1639         decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1640         used_bits += bits;
1641
1642         bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1643         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN))
1644                 return false; /* read_callback_ sets the state for us */
1645         used_bits += bits;
1646
1647         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16))
1648                 return false; /* read_callback_ sets the state for us */
1649         used_bits += 16*8;
1650
1651         /* skip the rest of the block */
1652         FLAC__ASSERT(used_bits % 8 == 0);
1653         length -= (used_bits / 8);
1654         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1655                 return false; /* read_callback_ sets the state for us */
1656
1657         return true;
1658 }
1659
1660 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1661 {
1662         FLAC__uint32 i, x;
1663         FLAC__uint64 xx;
1664
1665         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1666
1667         decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1668         decoder->private_->seek_table.is_last = is_last;
1669         decoder->private_->seek_table.length = length;
1670
1671         decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1672
1673         /* use realloc since we may pass through here several times (e.g. after seeking) */
1674         if(0 == (decoder->private_->seek_table.data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint)))) {
1675                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1676                 return false;
1677         }
1678         for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1679                 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN))
1680                         return false; /* read_callback_ sets the state for us */
1681                 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1682
1683                 if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN))
1684                         return false; /* read_callback_ sets the state for us */
1685                 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1686
1687                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN))
1688                         return false; /* read_callback_ sets the state for us */
1689                 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1690         }
1691         length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1692         /* if there is a partial point left, skip over it */
1693         if(length > 0) {
1694                 /*@@@ do a send_error_to_client_() here?  there's an argument for either way */
1695                 if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length))
1696                         return false; /* read_callback_ sets the state for us */
1697         }
1698
1699         return true;
1700 }
1701
1702 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj)
1703 {
1704         FLAC__uint32 i;
1705
1706         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1707
1708         /* read vendor string */
1709         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1710         if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length))
1711                 return false; /* read_callback_ sets the state for us */
1712         if(obj->vendor_string.length > 0) {
1713                 if(0 == (obj->vendor_string.entry = (FLAC__byte*)malloc(obj->vendor_string.length+1))) {
1714                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1715                         return false;
1716                 }
1717                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length))
1718                         return false; /* read_callback_ sets the state for us */
1719                 obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1720         }
1721         else
1722                 obj->vendor_string.entry = 0;
1723
1724         /* read num comments */
1725         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1726         if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments))
1727                 return false; /* read_callback_ sets the state for us */
1728
1729         /* read comments */
1730         if(obj->num_comments > 0) {
1731                 if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)malloc(obj->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1732                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1733                         return false;
1734                 }
1735                 for(i = 0; i < obj->num_comments; i++) {
1736                         FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1737                         if(!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length))
1738                                 return false; /* read_callback_ sets the state for us */
1739                         if(obj->comments[i].length > 0) {
1740                                 if(0 == (obj->comments[i].entry = (FLAC__byte*)malloc(obj->comments[i].length+1))) {
1741                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1742                                         return false;
1743                                 }
1744                                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length))
1745                                         return false; /* read_callback_ sets the state for us */
1746                                 obj->comments[i].entry[obj->comments[i].length] = '\0';
1747                         }
1748                         else
1749                                 obj->comments[i].entry = 0;
1750                 }
1751         }
1752         else {
1753                 obj->comments = 0;
1754         }
1755
1756         return true;
1757 }
1758
1759 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1760 {
1761         FLAC__uint32 i, j, x;
1762
1763         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1764
1765         memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1766
1767         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1768         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8))
1769                 return false; /* read_callback_ sets the state for us */
1770
1771         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN))
1772                 return false; /* read_callback_ sets the state for us */
1773
1774         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN))
1775                 return false; /* read_callback_ sets the state for us */
1776         obj->is_cd = x? true : false;
1777
1778         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN))
1779                 return false; /* read_callback_ sets the state for us */
1780
1781         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN))
1782                 return false; /* read_callback_ sets the state for us */
1783         obj->num_tracks = x;
1784
1785         if(obj->num_tracks > 0) {
1786                 if(0 == (obj->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1787                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1788                         return false;
1789                 }
1790                 for(i = 0; i < obj->num_tracks; i++) {
1791                         FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1792                         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN))
1793                                 return false; /* read_callback_ sets the state for us */
1794
1795                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN))
1796                                 return false; /* read_callback_ sets the state for us */
1797                         track->number = (FLAC__byte)x;
1798
1799                         FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1800                         if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8))
1801                                 return false; /* read_callback_ sets the state for us */
1802
1803                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN))
1804                                 return false; /* read_callback_ sets the state for us */
1805                         track->type = x;
1806
1807                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN))
1808                                 return false; /* read_callback_ sets the state for us */
1809                         track->pre_emphasis = x;
1810
1811                         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN))
1812                                 return false; /* read_callback_ sets the state for us */
1813
1814                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN))
1815                                 return false; /* read_callback_ sets the state for us */
1816                         track->num_indices = (FLAC__byte)x;
1817
1818                         if(track->num_indices > 0) {
1819                                 if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1820                                         decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1821                                         return false;
1822                                 }
1823                                 for(j = 0; j < track->num_indices; j++) {
1824                                         FLAC__StreamMetadata_CueSheet_Index *index = &track->indices[j];
1825                                         if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &index->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN))
1826                                                 return false; /* read_callback_ sets the state for us */
1827
1828                                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN))
1829                                                 return false; /* read_callback_ sets the state for us */
1830                                         index->number = (FLAC__byte)x;
1831
1832                                         if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN))
1833                                                 return false; /* read_callback_ sets the state for us */
1834                                 }
1835                         }
1836                 }
1837         }
1838
1839         return true;
1840 }
1841
1842 FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj)
1843 {
1844         FLAC__uint32 x;
1845
1846         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
1847
1848         /* read type */
1849         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN))
1850                 return false; /* read_callback_ sets the state for us */
1851         obj->type = x;
1852
1853         /* read MIME type */
1854         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN))
1855                 return false; /* read_callback_ sets the state for us */
1856         if(0 == (obj->mime_type = (char*)malloc(x+1))) {
1857                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1858                 return false;
1859         }
1860         if(x > 0) {
1861                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x))
1862                         return false; /* read_callback_ sets the state for us */
1863         }
1864         obj->mime_type[x] = '\0';
1865
1866         /* read description */
1867         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN))
1868                 return false; /* read_callback_ sets the state for us */
1869         if(0 == (obj->description = (FLAC__byte*)malloc(x+1))) {
1870                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1871                 return false;
1872         }
1873         if(x > 0) {
1874                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x))
1875                         return false; /* read_callback_ sets the state for us */
1876         }
1877         obj->description[x] = '\0';
1878
1879         /* read width */
1880         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN))
1881                 return false; /* read_callback_ sets the state for us */
1882
1883         /* read height */
1884         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN))
1885                 return false; /* read_callback_ sets the state for us */
1886
1887         /* read depth */
1888         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN))
1889                 return false; /* read_callback_ sets the state for us */
1890
1891         /* read colors */
1892         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN))
1893                 return false; /* read_callback_ sets the state for us */
1894
1895         /* read data */
1896         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN))
1897                 return false; /* read_callback_ sets the state for us */
1898         if(0 == (obj->data = (FLAC__byte*)malloc(obj->data_length))) {
1899                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1900                 return false;
1901         }
1902         if(obj->data_length > 0) {
1903                 if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length))
1904                         return false; /* read_callback_ sets the state for us */
1905         }
1906
1907         return true;
1908 }
1909
1910 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1911 {
1912         FLAC__uint32 x;
1913         unsigned i, skip;
1914
1915         /* skip the version and flags bytes */
1916         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24))
1917                 return false; /* read_callback_ sets the state for us */
1918         /* get the size (in bytes) to skip */
1919         skip = 0;
1920         for(i = 0; i < 4; i++) {
1921                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1922                         return false; /* read_callback_ sets the state for us */
1923                 skip <<= 7;
1924                 skip |= (x & 0x7f);
1925         }
1926         /* skip the rest of the tag */
1927         if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip))
1928                 return false; /* read_callback_ sets the state for us */
1929         return true;
1930 }
1931
1932 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1933 {
1934         FLAC__uint32 x;
1935         FLAC__bool first = true;
1936
1937         /* If we know the total number of samples in the stream, stop if we've read that many. */
1938         /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1939         if(FLAC__stream_decoder_get_total_samples(decoder) > 0) {
1940                 if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) {
1941                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1942                         return true;
1943                 }
1944         }
1945
1946         /* make sure we're byte aligned */
1947         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
1948                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
1949                         return false; /* read_callback_ sets the state for us */
1950         }
1951
1952         while(1) {
1953                 if(decoder->private_->cached) {
1954                         x = (FLAC__uint32)decoder->private_->lookahead;
1955                         decoder->private_->cached = false;
1956                 }
1957                 else {
1958                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1959                                 return false; /* read_callback_ sets the state for us */
1960                 }
1961                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1962                         decoder->private_->header_warmup[0] = (FLAC__byte)x;
1963                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
1964                                 return false; /* read_callback_ sets the state for us */
1965
1966                         /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1967                         /* else we have to check if the second byte is the end of a sync code */
1968                         if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1969                                 decoder->private_->lookahead = (FLAC__byte)x;
1970                                 decoder->private_->cached = true;
1971                         }
1972                         else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1973                                 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1974                                 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1975                                 return true;
1976                         }
1977                 }
1978                 if(first) {
1979                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
1980                         first = false;
1981                 }
1982         }
1983
1984         return true;
1985 }
1986
1987 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
1988 {
1989         unsigned channel;
1990         unsigned i;
1991         FLAC__int32 mid, side;
1992         unsigned frame_crc; /* the one we calculate from the input stream */
1993         FLAC__uint32 x;
1994
1995         *got_a_frame = false;
1996
1997         /* init the CRC */
1998         frame_crc = 0;
1999         frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
2000         frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
2001         FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc);
2002
2003         if(!read_frame_header_(decoder))
2004                 return false;
2005         if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */
2006                 return true;
2007         if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
2008                 return false;
2009         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2010                 /*
2011                  * first figure the correct bits-per-sample of the subframe
2012                  */
2013                 unsigned bps = decoder->private_->frame.header.bits_per_sample;
2014                 switch(decoder->private_->frame.header.channel_assignment) {
2015                         case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2016                                 /* no adjustment needed */
2017                                 break;
2018                         case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2019                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2020                                 if(channel == 1)
2021                                         bps++;
2022                                 break;
2023                         case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2024                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2025                                 if(channel == 0)
2026                                         bps++;
2027                                 break;
2028                         case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2029                                 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2030                                 if(channel == 1)
2031                                         bps++;
2032                                 break;
2033                         default:
2034                                 FLAC__ASSERT(0);
2035                 }
2036                 /*
2037                  * now read it
2038                  */
2039                 if(!read_subframe_(decoder, channel, bps, do_full_decode))
2040                         return false;
2041                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2042                         return true;
2043         }
2044         if(!read_zero_padding_(decoder))
2045                 return false;
2046
2047         /*
2048          * Read the frame CRC-16 from the footer and check
2049          */
2050         frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input);
2051         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN))
2052                 return false; /* read_callback_ sets the state for us */
2053         if(frame_crc == x) {
2054                 if(do_full_decode) {
2055                         /* Undo any special channel coding */
2056                         switch(decoder->private_->frame.header.channel_assignment) {
2057                                 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
2058                                         /* do nothing */
2059                                         break;
2060                                 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
2061                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2062                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2063                                                 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
2064                                         break;
2065                                 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
2066                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2067                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2068                                                 decoder->private_->output[0][i] += decoder->private_->output[1][i];
2069                                         break;
2070                                 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
2071                                         FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
2072                                         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2073 #if 1
2074                                                 mid = decoder->private_->output[0][i];
2075                                                 side = decoder->private_->output[1][i];
2076                                                 mid <<= 1;
2077                                                 mid |= (side & 1); /* i.e. if 'side' is odd... */
2078                                                 decoder->private_->output[0][i] = (mid + side) >> 1;
2079                                                 decoder->private_->output[1][i] = (mid - side) >> 1;
2080 #else
2081                                                 /* OPT: without 'side' temp variable */
2082                                                 mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */
2083                                                 decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1;
2084                                                 decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1;
2085 #endif
2086                                         }
2087                                         break;
2088                                 default:
2089                                         FLAC__ASSERT(0);
2090                                         break;
2091                         }
2092                 }
2093         }
2094         else {
2095                 /* Bad frame, emit error and zero the output signal */
2096                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH);
2097                 if(do_full_decode) {
2098                         for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
2099                                 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2100                         }
2101                 }
2102         }
2103
2104         *got_a_frame = true;
2105
2106         /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */
2107         if(decoder->private_->next_fixed_block_size)
2108                 decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size;
2109
2110         /* put the latest values into the public section of the decoder instance */
2111         decoder->protected_->channels = decoder->private_->frame.header.channels;
2112         decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
2113         decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
2114         decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
2115         decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
2116
2117         FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2118         decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
2119
2120         /* write it */
2121         if(do_full_decode) {
2122                 if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE)
2123                         return false;
2124         }
2125
2126         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2127         return true;
2128 }
2129
2130 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
2131 {
2132         FLAC__uint32 x;
2133         FLAC__uint64 xx;
2134         unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
2135         FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
2136         unsigned raw_header_len;
2137         FLAC__bool is_unparseable = false;
2138
2139         FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input));
2140
2141         /* init the raw header with the saved bits from synchronization */
2142         raw_header[0] = decoder->private_->header_warmup[0];
2143         raw_header[1] = decoder->private_->header_warmup[1];
2144         raw_header_len = 2;
2145
2146         /* check to make sure that reserved bit is 0 */
2147         if(raw_header[1] & 0x02) /* MAGIC NUMBER */
2148                 is_unparseable = true;
2149
2150         /*
2151          * Note that along the way as we read the header, we look for a sync
2152          * code inside.  If we find one it would indicate that our original
2153          * sync was bad since there cannot be a sync code in a valid header.
2154          *
2155          * Three kinds of things can go wrong when reading the frame header:
2156          *  1) We may have sync'ed incorrectly and not landed on a frame header.
2157          *     If we don't find a sync code, it can end up looking like we read
2158          *     a valid but unparseable header, until getting to the frame header
2159          *     CRC.  Even then we could get a false positive on the CRC.
2160          *  2) We may have sync'ed correctly but on an unparseable frame (from a
2161          *     future encoder).
2162          *  3) We may be on a damaged frame which appears valid but unparseable.
2163          *
2164          * For all these reasons, we try and read a complete frame header as
2165          * long as it seems valid, even if unparseable, up until the frame
2166          * header CRC.
2167          */
2168
2169         /*
2170          * read in the raw header as bytes so we can CRC it, and parse it on the way
2171          */
2172         for(i = 0; i < 2; i++) {
2173                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2174                         return false; /* read_callback_ sets the state for us */
2175                 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
2176                         /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
2177                         decoder->private_->lookahead = (FLAC__byte)x;
2178                         decoder->private_->cached = true;
2179                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2180                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2181                         return true;
2182                 }
2183                 raw_header[raw_header_len++] = (FLAC__byte)x;
2184         }
2185
2186         switch(x = raw_header[2] >> 4) {
2187                 case 0:
2188                         is_unparseable = true;
2189                         break;
2190                 case 1:
2191                         decoder->private_->frame.header.blocksize = 192;
2192                         break;
2193                 case 2:
2194                 case 3:
2195                 case 4:
2196                 case 5:
2197                         decoder->private_->frame.header.blocksize = 576 << (x-2);
2198                         break;
2199                 case 6:
2200                 case 7:
2201                         blocksize_hint = x;
2202                         break;
2203                 case 8:
2204                 case 9:
2205                 case 10:
2206                 case 11:
2207                 case 12:
2208                 case 13:
2209                 case 14:
2210                 case 15:
2211                         decoder->private_->frame.header.blocksize = 256 << (x-8);
2212                         break;
2213                 default:
2214                         FLAC__ASSERT(0);
2215                         break;
2216         }
2217
2218         switch(x = raw_header[2] & 0x0f) {
2219                 case 0:
2220                         if(decoder->private_->has_stream_info)
2221                                 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
2222                         else
2223                                 is_unparseable = true;
2224                         break;
2225                 case 1:
2226                         decoder->private_->frame.header.sample_rate = 88200;
2227                         break;
2228                 case 2:
2229                         decoder->private_->frame.header.sample_rate = 176400;
2230                         break;
2231                 case 3:
2232                         decoder->private_->frame.header.sample_rate = 192000;
2233                         break;
2234                 case 4:
2235                         decoder->private_->frame.header.sample_rate = 8000;
2236                         break;
2237                 case 5:
2238                         decoder->private_->frame.header.sample_rate = 16000;
2239                         break;
2240                 case 6:
2241                         decoder->private_->frame.header.sample_rate = 22050;
2242                         break;
2243                 case 7:
2244                         decoder->private_->frame.header.sample_rate = 24000;
2245                         break;
2246                 case 8:
2247                         decoder->private_->frame.header.sample_rate = 32000;
2248                         break;
2249                 case 9:
2250                         decoder->private_->frame.header.sample_rate = 44100;
2251                         break;
2252                 case 10:
2253                         decoder->private_->frame.header.sample_rate = 48000;
2254                         break;
2255                 case 11:
2256                         decoder->private_->frame.header.sample_rate = 96000;
2257                         break;
2258                 case 12:
2259                 case 13:
2260                 case 14:
2261                         sample_rate_hint = x;
2262                         break;
2263                 case 15:
2264                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2265                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2266                         return true;
2267                 default:
2268                         FLAC__ASSERT(0);
2269         }
2270
2271         x = (unsigned)(raw_header[3] >> 4);
2272         if(x & 8) {
2273                 decoder->private_->frame.header.channels = 2;
2274                 switch(x & 7) {
2275                         case 0:
2276                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
2277                                 break;
2278                         case 1:
2279                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
2280                                 break;
2281                         case 2:
2282                                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
2283                                 break;
2284                         default:
2285                                 is_unparseable = true;
2286                                 break;
2287                 }
2288         }
2289         else {
2290                 decoder->private_->frame.header.channels = (unsigned)x + 1;
2291                 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
2292         }
2293
2294         switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
2295                 case 0:
2296                         if(decoder->private_->has_stream_info)
2297                                 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2298                         else
2299                                 is_unparseable = true;
2300                         break;
2301                 case 1:
2302                         decoder->private_->frame.header.bits_per_sample = 8;
2303                         break;
2304                 case 2:
2305                         decoder->private_->frame.header.bits_per_sample = 12;
2306                         break;
2307                 case 4:
2308                         decoder->private_->frame.header.bits_per_sample = 16;
2309                         break;
2310                 case 5:
2311                         decoder->private_->frame.header.bits_per_sample = 20;
2312                         break;
2313                 case 6:
2314                         decoder->private_->frame.header.bits_per_sample = 24;
2315                         break;
2316                 case 3:
2317                 case 7:
2318                         is_unparseable = true;
2319                         break;
2320                 default:
2321                         FLAC__ASSERT(0);
2322                         break;
2323         }
2324
2325         /* check to make sure that reserved bit is 0 */
2326         if(raw_header[3] & 0x01) /* MAGIC NUMBER */
2327                 is_unparseable = true;
2328
2329         /* read the frame's starting sample number (or frame number as the case may be) */
2330         if(
2331                 raw_header[1] & 0x01 ||
2332                 /*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */
2333                 (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize)
2334         ) { /* variable blocksize */
2335                 if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len))
2336                         return false; /* read_callback_ sets the state for us */
2337                 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
2338                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2339                         decoder->private_->cached = true;
2340                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2341                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2342                         return true;
2343                 }
2344                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2345                 decoder->private_->frame.header.number.sample_number = xx;
2346         }
2347         else { /* fixed blocksize */
2348                 if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len))
2349                         return false; /* read_callback_ sets the state for us */
2350                 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
2351                         decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
2352                         decoder->private_->cached = true;
2353                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2354                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2355                         return true;
2356                 }
2357                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER;
2358                 decoder->private_->frame.header.number.frame_number = x;
2359         }
2360
2361         if(blocksize_hint) {
2362                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2363                         return false; /* read_callback_ sets the state for us */
2364                 raw_header[raw_header_len++] = (FLAC__byte)x;
2365                 if(blocksize_hint == 7) {
2366                         FLAC__uint32 _x;
2367                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2368                                 return false; /* read_callback_ sets the state for us */
2369                         raw_header[raw_header_len++] = (FLAC__byte)_x;
2370                         x = (x << 8) | _x;
2371                 }
2372                 decoder->private_->frame.header.blocksize = x+1;
2373         }
2374
2375         if(sample_rate_hint) {
2376                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2377                         return false; /* read_callback_ sets the state for us */
2378                 raw_header[raw_header_len++] = (FLAC__byte)x;
2379                 if(sample_rate_hint != 12) {
2380                         FLAC__uint32 _x;
2381                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8))
2382                                 return false; /* read_callback_ sets the state for us */
2383                         raw_header[raw_header_len++] = (FLAC__byte)_x;
2384                         x = (x << 8) | _x;
2385                 }
2386                 if(sample_rate_hint == 12)
2387                         decoder->private_->frame.header.sample_rate = x*1000;
2388                 else if(sample_rate_hint == 13)
2389                         decoder->private_->frame.header.sample_rate = x;
2390                 else
2391                         decoder->private_->frame.header.sample_rate = x*10;
2392         }
2393
2394         /* read the CRC-8 byte */
2395         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8))
2396                 return false; /* read_callback_ sets the state for us */
2397         crc8 = (FLAC__byte)x;
2398
2399         if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
2400                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER);
2401                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2402                 return true;
2403         }
2404
2405         /* calculate the sample number from the frame number if needed */
2406         decoder->private_->next_fixed_block_size = 0;
2407         if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) {
2408                 x = decoder->private_->frame.header.number.frame_number;
2409                 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
2410                 if(decoder->private_->fixed_block_size)
2411                         decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x;
2412                 else if(decoder->private_->has_stream_info) {
2413                         if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) {
2414                                 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
2415                                 decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize;
2416                         }
2417                         else
2418                                 is_unparseable = true;
2419                 }
2420                 else if(x == 0) {
2421                         decoder->private_->frame.header.number.sample_number = 0;
2422                         decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize;
2423                 }
2424                 else {
2425                         /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */
2426                         decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
2427                 }
2428         }
2429
2430         if(is_unparseable) {
2431                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2432                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2433                 return true;
2434         }
2435
2436         return true;
2437 }
2438
2439 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2440 {
2441         FLAC__uint32 x;
2442         FLAC__bool wasted_bits;
2443         unsigned i;
2444
2445         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */
2446                 return false; /* read_callback_ sets the state for us */
2447
2448         wasted_bits = (x & 1);
2449         x &= 0xfe;
2450
2451         if(wasted_bits) {
2452                 unsigned u;
2453                 if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u))
2454                         return false; /* read_callback_ sets the state for us */
2455                 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
2456                 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
2457         }
2458         else
2459                 decoder->private_->frame.subframes[channel].wasted_bits = 0;
2460
2461         /*
2462          * Lots of magic numbers here
2463          */
2464         if(x & 0x80) {
2465                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2466                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2467                 return true;
2468         }
2469         else if(x == 0) {
2470                 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
2471                         return false;
2472         }
2473         else if(x == 2) {
2474                 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
2475                         return false;
2476         }
2477         else if(x < 16) {
2478                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2479                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2480                 return true;
2481         }
2482         else if(x <= 24) {
2483                 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
2484                         return false;
2485                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2486                         return true;
2487         }
2488         else if(x < 64) {
2489                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2490                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2491                 return true;
2492         }
2493         else {
2494                 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
2495                         return false;
2496                 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */
2497                         return true;
2498         }
2499
2500         if(wasted_bits && do_full_decode) {
2501                 x = decoder->private_->frame.subframes[channel].wasted_bits;
2502                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2503                         decoder->private_->output[channel][i] <<= x;
2504         }
2505
2506         return true;
2507 }
2508
2509 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2510 {
2511         FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
2512         FLAC__int32 x;
2513         unsigned i;
2514         FLAC__int32 *output = decoder->private_->output[channel];
2515
2516         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
2517
2518         if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2519                 return false; /* read_callback_ sets the state for us */
2520
2521         subframe->value = x;
2522
2523         /* decode the subframe */
2524         if(do_full_decode) {
2525                 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
2526                         output[i] = x;
2527         }
2528
2529         return true;
2530 }
2531
2532 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
2533 {
2534         FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
2535         FLAC__int32 i32;
2536         FLAC__uint32 u32;
2537         unsigned u;
2538
2539         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
2540
2541         subframe->residual = decoder->private_->residual[channel];
2542         subframe->order = order;
2543
2544         /* read warm-up samples */
2545         for(u = 0; u < order; u++) {
2546                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2547                         return false; /* read_callback_ sets the state for us */
2548                 subframe->warmup[u] = i32;
2549         }
2550
2551         /* read entropy coding method info */
2552         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2553                 return false; /* read_callback_ sets the state for us */
2554         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2555         switch(subframe->entropy_coding_method.type) {
2556                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2557                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2558                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2559                                 return false; /* read_callback_ sets the state for us */
2560                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2561                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2562                         break;
2563                 default:
2564                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2565                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2566                         return true;
2567         }
2568
2569         /* read residual */
2570         switch(subframe->entropy_coding_method.type) {
2571                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2572                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2573                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2574                                 return false;
2575                         break;
2576                 default:
2577                         FLAC__ASSERT(0);
2578         }
2579
2580         /* decode the subframe */
2581         if(do_full_decode) {
2582                 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2583                 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
2584         }
2585
2586         return true;
2587 }
2588
2589 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
2590 {
2591         FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
2592         FLAC__int32 i32;
2593         FLAC__uint32 u32;
2594         unsigned u;
2595
2596         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
2597
2598         subframe->residual = decoder->private_->residual[channel];
2599         subframe->order = order;
2600
2601         /* read warm-up samples */
2602         for(u = 0; u < order; u++) {
2603                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps))
2604                         return false; /* read_callback_ sets the state for us */
2605                 subframe->warmup[u] = i32;
2606         }
2607
2608         /* read qlp coeff precision */
2609         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN))
2610                 return false; /* read_callback_ sets the state for us */
2611         if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
2612                 send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2613                 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2614                 return true;
2615         }
2616         subframe->qlp_coeff_precision = u32+1;
2617
2618         /* read qlp shift */
2619         if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN))
2620                 return false; /* read_callback_ sets the state for us */
2621         subframe->quantization_level = i32;
2622
2623         /* read quantized lp coefficiencts */
2624         for(u = 0; u < order; u++) {
2625                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision))
2626                         return false; /* read_callback_ sets the state for us */
2627                 subframe->qlp_coeff[u] = i32;
2628         }
2629
2630         /* read entropy coding method info */
2631         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN))
2632                 return false; /* read_callback_ sets the state for us */
2633         subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2634         switch(subframe->entropy_coding_method.type) {
2635                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2636                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2637                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN))
2638                                 return false; /* read_callback_ sets the state for us */
2639                         subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2640                         subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2641                         break;
2642                 default:
2643                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM);
2644                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2645                         return true;
2646         }
2647
2648         /* read residual */
2649         switch(subframe->entropy_coding_method.type) {
2650                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2651                 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2:
2652                         if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2))
2653                                 return false;
2654                         break;
2655                 default:
2656                         FLAC__ASSERT(0);
2657         }
2658
2659         /* decode the subframe */
2660         if(do_full_decode) {
2661                 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2662                 /*@@@@@@ technically not pessimistic enough, should be more like
2663                 if( (FLAC__uint64)order * ((((FLAC__uint64)1)<<bps)-1) * ((1<<subframe->qlp_coeff_precision)-1) < (((FLAC__uint64)-1) << 32) )
2664                 */
2665                 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2666                         if(bps <= 16 && subframe->qlp_coeff_precision <= 16) {
2667                                 if(order <= 8)
2668                                         decoder->private_->local_lpc_restore_signal_16bit_order8(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2669                                 else
2670                                         decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2671                         }
2672                         else
2673                                 decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2674                 else
2675                         decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2676         }
2677
2678         return true;
2679 }
2680
2681 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2682 {
2683         FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2684         FLAC__int32 x, *residual = decoder->private_->residual[channel];
2685         unsigned i;
2686
2687         decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2688
2689         subframe->data = residual;
2690
2691         for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2692                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps))
2693                         return false; /* read_callback_ sets the state for us */
2694                 residual[i] = x;
2695         }
2696
2697         /* decode the subframe */
2698         if(do_full_decode)
2699                 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2700
2701         return true;
2702 }
2703
2704 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended)
2705 {
2706         FLAC__uint32 rice_parameter;
2707         int i;
2708         unsigned partition, sample, u;
2709         const unsigned partitions = 1u << partition_order;
2710         const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
2711         const unsigned plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN;
2712         const unsigned pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER;
2713
2714         /* sanity checks */
2715         if(partition_order == 0) {
2716                 if(decoder->private_->frame.header.blocksize < predictor_order) {
2717                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2718                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2719                         return true;
2720                 }
2721         }
2722         else {
2723                 if(partition_samples < predictor_order) {
2724                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2725                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2726                         return true;
2727                 }
2728         }
2729
2730         if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) {
2731                 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2732                 return false;
2733         }
2734
2735         sample = 0;
2736         for(partition = 0; partition < partitions; partition++) {
2737                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen))
2738                         return false; /* read_callback_ sets the state for us */
2739                 partitioned_rice_contents->parameters[partition] = rice_parameter;
2740                 if(rice_parameter < pesc) {
2741                         partitioned_rice_contents->raw_bits[partition] = 0;
2742                         u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
2743                         if(!decoder->private_->local_bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter))
2744                                 return false; /* read_callback_ sets the state for us */
2745                         sample += u;
2746                 }
2747                 else {
2748                         if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN))
2749                                 return false; /* read_callback_ sets the state for us */
2750                         partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2751                         for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2752                                 if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter))
2753                                         return false; /* read_callback_ sets the state for us */
2754                                 residual[sample] = i;
2755                         }
2756                 }
2757         }
2758
2759         return true;
2760 }
2761
2762 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2763 {
2764         if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) {
2765                 FLAC__uint32 zero = 0;
2766                 if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input)))
2767                         return false; /* read_callback_ sets the state for us */
2768                 if(zero != 0) {
2769                         send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC);
2770                         decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2771                 }
2772         }
2773         return true;
2774 }
2775
2776 FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data)
2777 {
2778         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2779
2780         if(
2781 #if FLAC__HAS_OGG
2782                 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2783                 !decoder->private_->is_ogg &&
2784 #endif
2785                 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2786         ) {
2787                 *bytes = 0;
2788                 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2789                 return false;
2790         }
2791         else if(*bytes > 0) {
2792                 /* While seeking, it is possible for our seek to land in the
2793                  * middle of audio data that looks exactly like a frame header
2794                  * from a future version of an encoder.  When that happens, our
2795                  * error callback will get an
2796                  * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its
2797                  * unparseable_frame_count.  But there is a remote possibility
2798                  * that it is properly synced at such a "future-codec frame",
2799                  * so to make sure, we wait to see many "unparseable" errors in
2800                  * a row before bailing out.
2801                  */
2802                 if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) {
2803                         decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2804                         return false;
2805                 }
2806                 else {
2807                         const FLAC__StreamDecoderReadStatus status =
2808 #if FLAC__HAS_OGG
2809                                 decoder->private_->is_ogg?
2810                                 read_callback_ogg_aspect_(decoder, buffer, bytes) :
2811 #endif
2812                                 decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data)
2813                         ;
2814                         if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) {
2815                                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2816                                 return false;
2817                         }
2818                         else if(*bytes == 0) {
2819                                 if(
2820                                         status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM ||
2821                                         (
2822 #if FLAC__HAS_OGG
2823                                                 /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */
2824                                                 !decoder->private_->is_ogg &&
2825 #endif
2826                                                 decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data)
2827                                         )
2828                                 ) {
2829                                         decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2830                                         return false;
2831                                 }
2832                                 else
2833                                         return true;
2834                         }
2835                         else
2836                                 return true;
2837                 }
2838         }
2839         else {
2840                 /* abort to avoid a deadlock */
2841                 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2842                 return false;
2843         }
2844         /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around
2845          * for Ogg FLAC.  This is because the ogg decoder aspect can lose sync
2846          * and at the same time hit the end of the stream (for example, seeking
2847          * to a point that is after the beginning of the last Ogg page).  There
2848          * is no way to report an Ogg sync loss through the callbacks (see note
2849          * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0.
2850          * So to keep the decoder from stopping at this point we gate the call
2851          * to the eof_callback and let the Ogg decoder aspect set the
2852          * end-of-stream state when it is needed.
2853          */
2854 }
2855
2856 #if FLAC__HAS_OGG
2857 FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes)
2858 {
2859         switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) {
2860                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK:
2861                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2862                 /* we don't really have a way to handle lost sync via read
2863                  * callback so we'll let it pass and let the underlying
2864                  * FLAC decoder catch the error
2865                  */
2866                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC:
2867                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2868                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM:
2869                         return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
2870                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC:
2871                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION:
2872                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT:
2873                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR:
2874                 case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR:
2875                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2876                 default:
2877                         FLAC__ASSERT(0);
2878                         /* double protection */
2879                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
2880         }
2881 }
2882
2883 FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
2884 {
2885         FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder;
2886
2887         switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) {
2888                 case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE:
2889                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK;
2890                 case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM:
2891                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM;
2892                 case FLAC__STREAM_DECODER_READ_STATUS_ABORT:
2893                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2894                 default:
2895                         /* double protection: */
2896                         FLAC__ASSERT(0);
2897                         return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT;
2898         }
2899 }
2900 #endif
2901
2902 FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[])
2903 {
2904         if(decoder->private_->is_seeking) {
2905                 FLAC__uint64 this_frame_sample = frame->header.number.sample_number;
2906                 FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize;
2907                 FLAC__uint64 target_sample = decoder->private_->target_sample;
2908
2909                 FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
2910
2911 #if FLAC__HAS_OGG
2912                 decoder->private_->got_a_frame = true;
2913 #endif
2914                 decoder->private_->last_frame = *frame; /* save the frame */
2915                 if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */
2916                         unsigned delta = (unsigned)(target_sample - this_frame_sample);
2917                         /* kick out of seek mode */
2918                         decoder->private_->is_seeking = false;
2919                         /* shift out the samples before target_sample */
2920                         if(delta > 0) {
2921                                 unsigned channel;
2922                                 const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS];
2923                                 for(channel = 0; channel < frame->header.channels; channel++)
2924                                         newbuffer[channel] = buffer[channel] + delta;
2925                                 decoder->private_->last_frame.header.blocksize -= delta;
2926                                 decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta;
2927                                 /* write the relevant samples */
2928                                 return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data);
2929                         }
2930                         else {
2931                                 /* write the relevant samples */
2932                                 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2933                         }
2934                 }
2935                 else {
2936                         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
2937                 }
2938         }
2939         else {
2940                 /*
2941                  * If we never got STREAMINFO, turn off MD5 checking to save
2942                  * cycles since we don't have a sum to compare to anyway
2943                  */
2944                 if(!decoder->private_->has_stream_info)
2945                         decoder->private_->do_md5_checking = false;
2946                 if(decoder->private_->do_md5_checking) {
2947                         if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8))
2948                                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
2949                 }
2950                 return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data);
2951         }
2952 }
2953
2954 void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status)
2955 {
2956         if(!decoder->private_->is_seeking)
2957                 decoder->private_->error_callback(decoder, status, decoder->private_->client_data);
2958         else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM)
2959                 decoder->private_->unparseable_frame_count++;
2960 }
2961
2962 FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
2963 {
2964         FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample;
2965         FLAC__int64 pos = -1;
2966         int i;
2967         unsigned approx_bytes_per_frame;
2968         FLAC__bool first_seek = true;
2969         const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder);
2970         const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
2971         const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize;
2972         const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize;
2973         const unsigned min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize;
2974         /* take these from the current frame in case they've changed mid-stream */
2975         unsigned channels = FLAC__stream_decoder_get_channels(decoder);
2976         unsigned bps = FLAC__stream_decoder_get_bits_per_sample(decoder);
2977         const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0;
2978
2979         /* use values from stream info if we didn't decode a frame */
2980         if(channels == 0)
2981                 channels = decoder->private_->stream_info.data.stream_info.channels;
2982         if(bps == 0)
2983                 bps = decoder->private_->stream_info.data.stream_info.bits_per_sample;
2984
2985         /* we are just guessing here */
2986         if(max_framesize > 0)
2987                 approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1;
2988         /*
2989          * Check if it's a known fixed-blocksize stream.  Note that though
2990          * the spec doesn't allow zeroes in the STREAMINFO block, we may
2991          * never get a STREAMINFO block when decoding so the value of
2992          * min_blocksize might be zero.
2993          */
2994         else if(min_blocksize == max_blocksize && min_blocksize > 0) {
2995                 /* note there are no () around 'bps/8' to keep precision up since it's an integer calulation */
2996                 approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64;
2997         }
2998         else
2999                 approx_bytes_per_frame = 4096 * channels * bps/8 + 64;
3000
3001         /*
3002          * First, we set an upper and lower bound on where in the
3003          * stream we will search.  For now we assume the worst case
3004          * scenario, which is our best guess at the beginning of
3005          * the first frame and end of the stream.
3006          */
3007         lower_bound = first_frame_offset;
3008         lower_bound_sample = 0;
3009         upper_bound = stream_length;
3010         upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/;
3011
3012         /*
3013          * Now we refine the bounds if we have a seektable with
3014          * suitable points.  Note that according to the spec they
3015          * must be ordered by ascending sample number.
3016          *
3017          * Note: to protect against invalid seek tables we will ignore points
3018          * that have frame_samples==0 or sample_number>=total_samples
3019          */
3020         if(seek_table) {
3021                 FLAC__uint64 new_lower_bound = lower_bound;
3022                 FLAC__uint64 new_upper_bound = upper_bound;
3023                 FLAC__uint64 new_lower_bound_sample = lower_bound_sample;
3024                 FLAC__uint64 new_upper_bound_sample = upper_bound_sample;
3025
3026                 /* find the closest seek point <= target_sample, if it exists */
3027                 for(i = (int)seek_table->num_points - 1; i >= 0; i--) {
3028                         if(
3029                                 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3030                                 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3031                                 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3032                                 seek_table->points[i].sample_number <= target_sample
3033                         )
3034                                 break;
3035                 }
3036                 if(i >= 0) { /* i.e. we found a suitable seek point... */
3037                         new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset;
3038                         new_lower_bound_sample = seek_table->points[i].sample_number;
3039                 }
3040
3041                 /* find the closest seek point > target_sample, if it exists */
3042                 for(i = 0; i < (int)seek_table->num_points; i++) {
3043                         if(
3044                                 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
3045                                 seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */
3046                                 (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */
3047                                 seek_table->points[i].sample_number > target_sample
3048                         )
3049                                 break;
3050                 }
3051                 if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */
3052                         new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset;
3053                         new_upper_bound_sample = seek_table->points[i].sample_number;
3054                 }
3055                 /* final protection against unsorted seek tables; keep original values if bogus */
3056                 if(new_upper_bound >= new_lower_bound) {
3057                         lower_bound = new_lower_bound;
3058                         upper_bound = new_upper_bound;
3059                         lower_bound_sample = new_lower_bound_sample;
3060                         upper_bound_sample = new_upper_bound_sample;
3061                 }
3062         }
3063
3064         FLAC__ASSERT(upper_bound_sample >= lower_bound_sample);
3065         /* there are 2 insidious ways that the following equality occurs, which
3066          * we need to fix:
3067          *  1) total_samples is 0 (unknown) and target_sample is 0
3068          *  2) total_samples is 0 (unknown) and target_sample happens to be
3069          *     exactly equal to the last seek point in the seek table; this
3070          *     means there is no seek point above it, and upper_bound_samples
3071          *     remains equal to the estimate (of target_samples) we made above
3072          * in either case it does not hurt to move upper_bound_sample up by 1
3073          */
3074         if(upper_bound_sample == lower_bound_sample)
3075                 upper_bound_sample++;
3076
3077         decoder->private_->target_sample = target_sample;
3078         while(1) {
3079                 /* check if the bounds are still ok */
3080                 if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) {
3081                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3082                         return false;
3083                 }
3084 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3085 #if defined _MSC_VER || defined __MINGW32__
3086                 /* with VC++ you have to spoon feed it the casting */
3087                 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(FLAC__int64)(target_sample - lower_bound_sample) / (FLAC__double)(FLAC__int64)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(FLAC__int64)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3088 #else
3089                 pos = (FLAC__int64)lower_bound + (FLAC__int64)((FLAC__double)(target_sample - lower_bound_sample) / (FLAC__double)(upper_bound_sample - lower_bound_sample) * (FLAC__double)(upper_bound - lower_bound)) - approx_bytes_per_frame;
3090 #endif
3091 #else
3092                 /* a little less accurate: */
3093                 if(upper_bound - lower_bound < 0xffffffff)
3094                         pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_sample - lower_bound_sample) * (upper_bound - lower_bound)) / (upper_bound_sample - lower_bound_sample)) - approx_bytes_per_frame;
3095                 else /* @@@ WATCHOUT, ~2TB limit */
3096                         pos = (FLAC__int64)lower_bound + (FLAC__int64)((((target_sample - lower_bound_sample)>>8) * ((upper_bound - lower_bound)>>8)) / ((upper_bound_sample - lower_bound_sample)>>16)) - approx_bytes_per_frame;
3097 #endif
3098                 if(pos >= (FLAC__int64)upper_bound)
3099                         pos = (FLAC__int64)upper_bound - 1;
3100                 if(pos < (FLAC__int64)lower_bound)
3101                         pos = (FLAC__int64)lower_bound;
3102                 if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3103                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3104                         return false;
3105                 }
3106                 if(!FLAC__stream_decoder_flush(decoder)) {
3107                         /* above call sets the state for us */
3108                         return false;
3109                 }
3110                 /* Now we need to get a frame.  First we need to reset our
3111                  * unparseable_frame_count; if we get too many unparseable
3112                  * frames in a row, the read callback will return
3113                  * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing
3114                  * FLAC__stream_decoder_process_single() to return false.
3115                  */
3116                 decoder->private_->unparseable_frame_count = 0;
3117                 if(!FLAC__stream_decoder_process_single(decoder)) {
3118                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3119                         return false;
3120                 }
3121                 /* our write callback will change the state when it gets to the target frame */
3122                 /* actually, we could have got_a_frame if our decoder is at FLAC__STREAM_DECODER_END_OF_STREAM so we need to check for that also */
3123 #if 0
3124                 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */
3125                 if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM)
3126                         break;
3127 #endif
3128                 if(!decoder->private_->is_seeking)
3129                         break;
3130
3131                 FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3132                 this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3133
3134                 if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) {
3135                         if (pos == (FLAC__int64)lower_bound) {
3136                                 /* can't move back any more than the first frame, something is fatally wrong */
3137                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3138                                 return false;
3139                         }
3140                         /* our last move backwards wasn't big enough, try again */
3141                         approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16;
3142                         continue;
3143                 }
3144                 /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */
3145                 first_seek = false;
3146
3147                 /* make sure we are not seeking in corrupted stream */
3148                 if (this_frame_sample < lower_bound_sample) {
3149                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3150                         return false;
3151                 }
3152
3153                 /* we need to narrow the search */
3154                 if(target_sample < this_frame_sample) {
3155                         upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3156 /*@@@@@@ what will decode position be if at end of stream? */
3157                         if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) {
3158                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3159                                 return false;
3160                         }
3161                         approx_bytes_per_frame = (unsigned)(2 * (upper_bound - pos) / 3 + 16);
3162                 }
3163                 else { /* target_sample >= this_frame_sample + this frame's blocksize */
3164                         lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize;
3165                         if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) {
3166                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3167                                 return false;
3168                         }
3169                         approx_bytes_per_frame = (unsigned)(2 * (lower_bound - pos) / 3 + 16);
3170                 }
3171         }
3172
3173         return true;
3174 }
3175
3176 #if FLAC__HAS_OGG
3177 FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample)
3178 {
3179         FLAC__uint64 left_pos = 0, right_pos = stream_length;
3180         FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder);
3181         FLAC__uint64 this_frame_sample = 0; /* only initialized to avoid compiler warning */
3182         FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */
3183         FLAC__bool did_a_seek;
3184         unsigned iteration = 0;
3185
3186         /* In the first iterations, we will calculate the target byte position
3187          * by the distance from the target sample to left_sample and
3188          * right_sample (let's call it "proportional search").  After that, we
3189          * will switch to binary search.
3190          */
3191         unsigned BINARY_SEARCH_AFTER_ITERATION = 2;
3192
3193         /* We will switch to a linear search once our current sample is less
3194          * than this number of samples ahead of the target sample
3195          */
3196         static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2;
3197
3198         /* If the total number of samples is unknown, use a large value, and
3199          * force binary search immediately.
3200          */
3201         if(right_sample == 0) {
3202                 right_sample = (FLAC__uint64)(-1);
3203                 BINARY_SEARCH_AFTER_ITERATION = 0;
3204         }
3205
3206         decoder->private_->target_sample = target_sample;
3207         for( ; ; iteration++) {
3208                 if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) {
3209                         if (iteration >= BINARY_SEARCH_AFTER_ITERATION) {
3210                                 pos = (right_pos + left_pos) / 2;
3211                         }
3212                         else {
3213 #ifndef FLAC__INTEGER_ONLY_LIBRARY
3214 #if defined _MSC_VER || defined __MINGW32__
3215                                 /* with MSVC you have to spoon feed it the casting */
3216                                 pos = (FLAC__uint64)((FLAC__double)(FLAC__int64)(target_sample - left_sample) / (FLAC__double)(FLAC__int64)(right_sample - left_sample) * (FLAC__double)(FLAC__int64)(right_pos - left_pos));
3217 #else
3218                                 pos = (FLAC__uint64)((FLAC__double)(target_sample - left_sample) / (FLAC__double)(right_sample - left_sample) * (FLAC__double)(right_pos - left_pos));
3219 #endif
3220 #else
3221                                 /* a little less accurate: */
3222                                 if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff))
3223                                         pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample));
3224                                 else /* @@@ WATCHOUT, ~2TB limit */
3225                                         pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16));
3226 #endif
3227                                 /* @@@ TODO: might want to limit pos to some distance
3228                                  * before EOF, to make sure we land before the last frame,
3229                                  * thereby getting a this_frame_sample and so having a better
3230                                  * estimate.  @@@@@@DELETE:this would also mostly (or totally if we could
3231                                  * be sure to land before the last frame) avoid the
3232                                  * end-of-stream case we have to check later.
3233                                  */
3234                         }
3235
3236                         /* physical seek */
3237                         if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) {
3238                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3239                                 return false;
3240                         }
3241                         if(!FLAC__stream_decoder_flush(decoder)) {
3242                                 /* above call sets the state for us */
3243                                 return false;
3244                         }
3245                         did_a_seek = true;
3246                 }
3247                 else
3248                         did_a_seek = false;
3249
3250                 decoder->private_->got_a_frame = false;
3251                 if(!FLAC__stream_decoder_process_single(decoder)) {
3252                         decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3253                         return false;
3254                 }
3255                 if(!decoder->private_->got_a_frame) {
3256                         if(did_a_seek) {
3257                                 /* this can happen if we seek to a point after the last frame; we drop
3258                                  * to binary search right away in this case to avoid any wasted
3259                                  * iterations of proportional search.
3260                                  */
3261                                 right_pos = pos;
3262                                 BINARY_SEARCH_AFTER_ITERATION = 0;
3263                         }
3264                         else {
3265                                 /* this can probably only happen if total_samples is unknown and the
3266                                  * target_sample is past the end of the stream
3267                                  */
3268                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3269                                 return false;
3270                         }
3271                 }
3272                 /* our write callback will change the state when it gets to the target frame */
3273                 else if(!decoder->private_->is_seeking/*@@@@@@ && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM*/) {
3274                         break;
3275                 }
3276                 else {
3277                         this_frame_sample = decoder->private_->last_frame.header.number.sample_number;
3278                         FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
3279
3280                         if (did_a_seek) {
3281                                 if (this_frame_sample <= target_sample) {
3282                                         /* The 'equal' case should not happen, since
3283                                          * FLAC__stream_decoder_process_single()
3284                                          * should recognize that it has hit the
3285                                          * target sample and we would exit through
3286                                          * the 'break' above.
3287                                          */
3288                                         FLAC__ASSERT(this_frame_sample != target_sample);
3289
3290                                         left_sample = this_frame_sample;
3291                                         /* sanity check to avoid infinite loop */
3292                                         if (left_pos == pos) {
3293                                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3294                                                 return false;
3295                                         }
3296                                         left_pos = pos;
3297                                 }
3298                                 else if(this_frame_sample > target_sample) {
3299                                         right_sample = this_frame_sample;
3300                                         /* sanity check to avoid infinite loop */
3301                                         if (right_pos == pos) {
3302                                                 decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR;
3303                                                 return false;
3304                                         }
3305                                         right_pos = pos;
3306                                 }
3307                         }
3308                 }
3309         }
3310
3311         return true;
3312 }
3313 #endif
3314
3315 FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data)
3316 {
3317         (void)client_data;
3318
3319         if(*bytes > 0) {
3320                 *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file);
3321                 if(ferror(decoder->private_->file))
3322                         return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
3323                 else if(*bytes == 0)
3324                         return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
3325                 else
3326                         return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
3327         }
3328         else
3329                 return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */
3330 }
3331
3332 FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data)
3333 {
3334         (void)client_data;
3335
3336         if(decoder->private_->file == stdin)
3337                 return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
3338         else if(fseeko(decoder->private_->file, (off_t)absolute_byte_offset, SEEK_SET) < 0)
3339                 return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
3340         else
3341                 return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
3342 }
3343
3344 FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
3345 {
3346         off_t pos;
3347         (void)client_data;
3348
3349         if(decoder->private_->file == stdin)
3350                 return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
3351         else if((pos = ftello(decoder->private_->file)) < 0)
3352                 return FLAC__STREAM_DECODER_TELL_STATUS_ERROR;
3353         else {
3354                 *absolute_byte_offset = (FLAC__uint64)pos;
3355                 return FLAC__STREAM_DECODER_TELL_STATUS_OK;
3356         }
3357 }
3358
3359 FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data)
3360 {
3361         struct stat filestats;
3362         (void)client_data;
3363
3364         if(decoder->private_->file == stdin)
3365                 return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
3366         else if(fstat(fileno(decoder->private_->file), &filestats) != 0)
3367                 return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR;
3368         else {
3369                 *stream_length = (FLAC__uint64)filestats.st_size;
3370                 return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
3371         }
3372 }
3373
3374 FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data)
3375 {
3376         (void)client_data;
3377
3378         return feof(decoder->private_->file)? true : false;
3379 }