src/flac/encode.c

   1 /* flac - Command-line FLAC encoder/decoder
   2  * Copyright (C) 2000,2001  Josh Coalson
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #if defined _WIN32 && !defined __CYGWIN__
  20 /* where MSVC puts unlink() */
  21 # include <io.h>
  22 #else
  23 # include <unistd.h>
  24 #endif
  25 #include <stdio.h> /* for FILE et al. */
  26 #include <stdlib.h> /* for malloc */
  27 #include <string.h> /* for strcmp() */
  28 #include "FLAC/all.h"
  29 #include "encode.h"
  30
  31 #ifdef min
  32 #undef min
  33 #endif
  34 #define min(x,y) ((x)<(y)?(x):(y))
  35
  36 #define CHUNK_OF_SAMPLES 2048
  37
  38 typedef enum {
  39         FLAC__VERIFY_OK,
  40         FLAC__VERIFY_FAILED_IN_FRAME,
  41         FLAC__VERIFY_FAILED_IN_METADATA
  42 } verify_code;
  43
  44 static const char *verify_code_string[] = {
  45         "FLAC__VERIFY_OK",
  46         "FLAC__VERIFY_FAILED_IN_FRAME",
  47         "FLAC__VERIFY_FAILED_IN_METADATA"
  48 };
  49
  50 typedef struct {
  51         int32 *original[FLAC__MAX_CHANNELS];
  52         unsigned size; /* of each original[] in samples */
  53         unsigned tail; /* in wide samples */
  54         const byte *encoded_signal;
  55         unsigned encoded_signal_capacity;
  56         unsigned encoded_bytes;
  57         bool into_frames;
  58         verify_code result;
  59         FLAC__StreamDecoder *decoder;
  60 } verify_fifo_struct;
  61
  62 typedef struct {
  63         FILE *fout;
  64         const char *outfilename;
  65         FLAC__StreamEncoder *encoder;
  66         bool verify;
  67         bool verbose;
  68         uint64 unencoded_size;
  69         uint64 total_samples_to_encode;
  70         uint64 bytes_written;
  71         uint64 samples_written;
  72         uint64 stream_offset; /* i.e. number of bytes before the first byte of the the first frame's header */
  73         unsigned current_frame;
  74         verify_fifo_struct verify_fifo;
  75         FLAC__StreamMetaData_SeekTable seek_table;
  76         unsigned first_seek_point_to_check;
  77 } encoder_wrapper_struct;
  78
  79 static bool is_big_endian_host;
  80
  81 static unsigned char ucbuffer[CHUNK_OF_SAMPLES*FLAC__MAX_CHANNELS*((FLAC__MAX_BITS_PER_SAMPLE+7)/8)];
  82 static signed char *scbuffer = (signed char *)ucbuffer;
  83 static uint16 *usbuffer = (uint16 *)ucbuffer;
  84 static int16 *ssbuffer = (int16 *)ucbuffer;
  85
  86 static int32 in[FLAC__MAX_CHANNELS][CHUNK_OF_SAMPLES];
  87 static int32 *input[FLAC__MAX_CHANNELS];
  88
  89 /* local routines */
  90 static bool init(encoder_wrapper_struct *encoder_wrapper);
  91 static bool init_encoder(bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned channels, unsigned bps, unsigned sample_rate, unsigned padding, char *requested_seek_points, int num_requested_seek_points, encoder_wrapper_struct *encoder_wrapper);
  92 static bool convert_to_seek_table(char *requested_seek_points, int num_requested_seek_points, uint64 stream_samples, unsigned blocksize, FLAC__StreamMetaData_SeekTable *seek_table);
  93 static void append_point_to_seek_table(FLAC__StreamMetaData_SeekTable *seek_table, uint64 sample, uint64 stream_samples, uint64 blocksize);
  94 static int seekpoint_compare(const FLAC__StreamMetaData_SeekPoint *l, const FLAC__StreamMetaData_SeekPoint *r);
  95 static void format_input(unsigned wide_samples, bool is_big_endian, bool is_unsigned_samples, unsigned channels, unsigned bps, encoder_wrapper_struct *encoder_wrapper);
  96 static FLAC__StreamEncoderWriteStatus write_callback(const FLAC__StreamEncoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data);
  97 static void metadata_callback(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data);
  98 static FLAC__StreamDecoderReadStatus verify_read_callback(const FLAC__StreamDecoder *decoder, byte buffer[], unsigned *bytes, void *client_data);
  99 static FLAC__StreamDecoderWriteStatus verify_write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data);
 100 static void verify_metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
 101 static void verify_error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
 102 static void print_stats(const encoder_wrapper_struct *encoder_wrapper);
 103 static bool read_little_endian_uint16(FILE *f, uint16 *val, bool eof_ok);
 104 static bool read_little_endian_uint32(FILE *f, uint32 *val, bool eof_ok);
 105 static bool write_big_endian_uint16(FILE *f, uint16 val);
 106 static bool write_big_endian_uint64(FILE *f, uint64 val);
 107
 108 int flac__encode_wav(FILE *infile, long infilesize, const char *infilename, const char *outfilename, const byte *lookahead, unsigned lookahead_length, bool verbose, uint64 skip, bool verify, bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned padding, char *requested_seek_points, int num_requested_seek_points)
 109 {
 110         encoder_wrapper_struct encoder_wrapper;
 111         bool is_unsigned_samples = false;
 112         unsigned channels = 0, bps = 0, sample_rate = 0, data_bytes;
 113         size_t bytes_per_wide_sample, bytes_read;
 114         uint16 x;
 115         uint32 xx;
 116         bool got_fmt_chunk = false, got_data_chunk = false;
 117
 118         encoder_wrapper.encoder = 0;
 119         encoder_wrapper.verify = verify;
 120         encoder_wrapper.verbose = verbose;
 121         encoder_wrapper.bytes_written = 0;
 122         encoder_wrapper.samples_written = 0;
 123         encoder_wrapper.stream_offset = 0;
 124         encoder_wrapper.outfilename = outfilename;
 125         encoder_wrapper.seek_table.points = 0;
 126         encoder_wrapper.first_seek_point_to_check = 0;
 127         (void)infilesize;
 128         (void)lookahead;
 129         (void)lookahead_length;
 130
 131         if(0 == strcmp(outfilename, "-")) {
 132                 encoder_wrapper.fout = stdout;
 133         }
 134         else {
 135                 if(0 == (encoder_wrapper.fout = fopen(outfilename, "wb"))) {
 136                         fprintf(stderr, "ERROR: can't open output file %s\n", outfilename);
 137                         fclose(infile);
 138                         return false;
 139                 }
 140         }
 141
 142         if(!init(&encoder_wrapper))
 143                 goto wav_abort_;
 144
 145         /*
 146          * lookahead[] already has "RIFFxxxxWAVE", do sub-chunks
 147          */
 148         while(!feof(infile)) {
 149                 if(!read_little_endian_uint32(infile, &xx, true))
 150                         goto wav_abort_;
 151                 if(feof(infile))
 152                         break;
 153                 if(xx == 0x20746d66) { /* "fmt " */
 154                         if(got_fmt_chunk) {
 155                                 fprintf(stderr, "WARNING: skipping extra 'fmt ' sub-chunk\n");
 156                         }
 157                         else {
 158                                 /* fmt sub-chunk size */
 159                                 if(!read_little_endian_uint32(infile, &xx, false))
 160                                         goto wav_abort_;
 161                                 if(xx != 16) {
 162                                         fprintf(stderr, "ERROR: unsupported non-standard 'fmt ' sub-chunk has length %u != 16\n", (unsigned)xx);
 163                                         goto wav_abort_;
 164                                 }
 165                                 /* compression code */
 166                                 if(!read_little_endian_uint16(infile, &x, false))
 167                                         goto wav_abort_;
 168                                 if(x != 1) {
 169                                         fprintf(stderr, "ERROR: unsupported compression type %u\n", (unsigned)x);
 170                                         goto wav_abort_;
 171                                 }
 172                                 /* number of channels */
 173                                 if(!read_little_endian_uint16(infile, &x, false))
 174                                         goto wav_abort_;
 175                                 if(x == 0 || x > FLAC__MAX_CHANNELS) {
 176                                         fprintf(stderr, "ERROR: unsupported number channels %u\n", (unsigned)x);
 177                                         goto wav_abort_;
 178                                 }
 179                                 channels = x;
 180                                 /* sample rate */
 181                                 if(!read_little_endian_uint32(infile, &xx, false))
 182                                         goto wav_abort_;
 183                                 if(xx == 0 || xx > FLAC__MAX_SAMPLE_RATE) {
 184                                         fprintf(stderr, "ERROR: unsupported sample rate %u\n", (unsigned)xx);
 185                                         goto wav_abort_;
 186                                 }
 187                                 sample_rate = xx;
 188                                 /* avg bytes per second (ignored) */
 189                                 if(!read_little_endian_uint32(infile, &xx, false))
 190                                         goto wav_abort_;
 191                                 /* block align (ignored) */
 192                                 if(!read_little_endian_uint16(infile, &x, false))
 193                                         goto wav_abort_;
 194                                 /* bits per sample */
 195                                 if(!read_little_endian_uint16(infile, &x, false))
 196                                         goto wav_abort_;
 197                                 if(x != 8 && x != 16) {
 198                                         fprintf(stderr, "ERROR: unsupported bits per sample %u\n", (unsigned)x);
 199                                         goto wav_abort_;
 200                                 }
 201                                 bps = x;
 202                                 is_unsigned_samples = (x == 8);
 203
 204                                 got_fmt_chunk = true;
 205                         }
 206                 }
 207                 else if(xx == 0x61746164) { /* "data" */
 208                         if(got_data_chunk) {
 209                                 fprintf(stderr, "WARNING: skipping extra 'data' sub-chunk\n");
 210                         }
 211                         else if(!got_fmt_chunk) {
 212                                 fprintf(stderr, "ERROR: got data sub-chunk before fmt sub-chunk\n");
 213                                 goto wav_abort_;
 214                         }
 215                         else {
 216                                 /* data size */
 217                                 if(!read_little_endian_uint32(infile, &xx, false))
 218                                         goto wav_abort_;
 219                                 data_bytes = xx;
 220
 221                                 bytes_per_wide_sample = channels * (bps >> 3);
 222
 223                                 if(skip > 0) {
 224                                         if(infile != stdin) {
 225                                                 if(-1 == fseek(infile, bytes_per_wide_sample * (unsigned)skip, SEEK_CUR)) {
 226                                                         fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 227                                                         goto wav_abort_;
 228                                                 }
 229                                         }
 230                                         else {
 231                                                 unsigned left, need;
 232                                                 for(left = skip; left > 0; ) {
 233                                                         need = min(left, CHUNK_OF_SAMPLES);
 234                                                         if(fread(ucbuffer, 1, bytes_per_wide_sample * need, infile) < need) {
 235                                                                 fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 236                                                                 goto wav_abort_;
 237                                                         }
 238                                                         left -= need;
 239                                                 }
 240                                         }
 241                                 }
 242
 243                                 encoder_wrapper.total_samples_to_encode = data_bytes / bytes_per_wide_sample - skip;
 244                                 encoder_wrapper.unencoded_size = encoder_wrapper.total_samples_to_encode * bytes_per_wide_sample + 44; /* 44 for the size of the WAV headers */
 245
 246                                 if(!init_encoder(lax, do_mid_side, loose_mid_side, do_exhaustive_model_search, do_qlp_coeff_prec_search, min_residual_partition_order, max_residual_partition_order, rice_parameter_search_dist, max_lpc_order, blocksize, qlp_coeff_precision, channels, bps, sample_rate, padding, requested_seek_points, num_requested_seek_points, &encoder_wrapper))
 247                                         goto wav_abort_;
 248
 249                                 encoder_wrapper.verify_fifo.into_frames = true;
 250
 251                                 while(data_bytes > 0) {
 252                                         bytes_read = fread(ucbuffer, sizeof(unsigned char), CHUNK_OF_SAMPLES * bytes_per_wide_sample, infile);
 253                                         if(bytes_read == 0) {
 254                                                 if(ferror(infile)) {
 255                                                         fprintf(stderr, "ERROR reading from %s\n", infilename);
 256                                                         goto wav_abort_;
 257                                                 }
 258                                                 else if(feof(infile))
 259                                                         break;
 260                                         }
 261                                         else {
 262                                                 if(bytes_read > data_bytes)
 263                                                         bytes_read = data_bytes; /* chop off anything after the end of the data sub-chunk */
 264                                                 if(bytes_read % bytes_per_wide_sample != 0) {
 265                                                         fprintf(stderr, "ERROR, got partial sample from input file %s\n", infilename);
 266                                                         goto wav_abort_;
 267                                                 }
 268                                                 else {
 269                                                         unsigned wide_samples = bytes_read / bytes_per_wide_sample;
 270                                                         format_input(wide_samples, false, is_unsigned_samples, channels, bps, &encoder_wrapper);
 271
 272                                                         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 2 here: */
 273                                                         if(!FLAC__stream_encoder_process(encoder_wrapper.encoder, input, wide_samples)) {
 274                                                                 fprintf(stderr, "ERROR during encoding, state = %d:%s\n", FLAC__stream_encoder_state(encoder_wrapper.encoder), FLAC__StreamEncoderStateString[FLAC__stream_encoder_state(encoder_wrapper.encoder)]);
 275                                                                 goto wav_abort_;
 276                                                         }
 277                                                         data_bytes -= bytes_read;
 278                                                 }
 279                                         }
 280                                 }
 281                                 got_data_chunk = true;
 282                         }
 283                 }
 284                 else {
 285                         fprintf(stderr, "WARNING: skipping unknown sub-chunk '%c%c%c%c'\n", (char)(xx&255), (char)((xx>>8)&255), (char)((xx>>16)&255), (char)(xx>>24));
 286                         /* sub-chunk size */
 287                         if(!read_little_endian_uint32(infile, &xx, false))
 288                                 goto wav_abort_;
 289                         if(infile != stdin) {
 290                                 if(-1 == fseek(infile, xx, SEEK_CUR)) {
 291                                         fprintf(stderr, "ERROR seeking ahead while skipping unsupported sub-chunk in input file %s\n", infilename);
 292                                         goto wav_abort_;
 293                                 }
 294                         }
 295                         else {
 296                                 unsigned left, need;
 297                                 const unsigned chunk = sizeof(ucbuffer);
 298                                 for(left = xx; left > 0; ) {
 299                                         need = min(left, chunk);
 300                                         if(fread(ucbuffer, 1, need, infile) < need) {
 301                                                 fprintf(stderr, "ERROR seeking while skipping unsupported sub-chunk in input file %s\n", infilename);
 302                                                 goto wav_abort_;
 303                                         }
 304                                         left -= need;
 305                                 }
 306                         }
 307                 }
 308         }
 309
 310         if(encoder_wrapper.encoder) {
 311                 if(FLAC__stream_encoder_state(encoder_wrapper.encoder) == FLAC__STREAM_ENCODER_OK)
 312                         FLAC__stream_encoder_finish(encoder_wrapper.encoder);
 313                 FLAC__stream_encoder_delete(encoder_wrapper.encoder);
 314         }
 315         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0) {
 316                 print_stats(&encoder_wrapper);
 317                 fprintf(stderr, "\n");
 318         }
 319         if(0 != encoder_wrapper.seek_table.points)
 320                 free(encoder_wrapper.seek_table.points);
 321         if(verify) {
 322                 FLAC__stream_decoder_finish(encoder_wrapper.verify_fifo.decoder);
 323                 FLAC__stream_decoder_delete(encoder_wrapper.verify_fifo.decoder);
 324                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 325                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 326                         return 1;
 327                 }
 328                 else if(encoder_wrapper.verbose) {
 329                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 330                 }
 331         }
 332         if(infile != stdin)
 333                 fclose(infile);
 334         return 0;
 335 wav_abort_:
 336         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0)
 337                 fprintf(stderr, "\n");
 338         if(encoder_wrapper.encoder) {
 339                 if(FLAC__stream_encoder_state(encoder_wrapper.encoder) == FLAC__STREAM_ENCODER_OK)
 340                         FLAC__stream_encoder_finish(encoder_wrapper.encoder);
 341                 FLAC__stream_encoder_delete(encoder_wrapper.encoder);
 342         }
 343         if(0 != encoder_wrapper.seek_table.points)
 344                 free(encoder_wrapper.seek_table.points);
 345         if(verify) {
 346                 FLAC__stream_decoder_finish(encoder_wrapper.verify_fifo.decoder);
 347                 FLAC__stream_decoder_delete(encoder_wrapper.verify_fifo.decoder);
 348                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 349                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 350                         return 1;
 351                 }
 352                 else if(encoder_wrapper.verbose) {
 353                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 354                 }
 355         }
 356         if(infile != stdin)
 357                 fclose(infile);
 358         unlink(outfilename);
 359         return 1;
 360 }
 361
 362 int flac__encode_raw(FILE *infile, long infilesize, const char *infilename, const char *outfilename, const byte *lookahead, unsigned lookahead_length, bool verbose, uint64 skip, bool verify, bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned padding, char *requested_seek_points, int num_requested_seek_points, bool is_big_endian, bool is_unsigned_samples, unsigned channels, unsigned bps, unsigned sample_rate)
 363 {
 364         encoder_wrapper_struct encoder_wrapper;
 365         size_t bytes_read;
 366         const size_t bytes_per_wide_sample = channels * (bps >> 3);
 367
 368         encoder_wrapper.encoder = 0;
 369         encoder_wrapper.verify = verify;
 370         encoder_wrapper.verbose = verbose;
 371         encoder_wrapper.bytes_written = 0;
 372         encoder_wrapper.samples_written = 0;
 373         encoder_wrapper.stream_offset = 0;
 374         encoder_wrapper.outfilename = outfilename;
 375         encoder_wrapper.seek_table.points = 0;
 376         encoder_wrapper.first_seek_point_to_check = 0;
 377
 378         if(0 == strcmp(outfilename, "-")) {
 379                 encoder_wrapper.fout = stdout;
 380         }
 381         else {
 382                 if(0 == (encoder_wrapper.fout = fopen(outfilename, "wb"))) {
 383                         fprintf(stderr, "ERROR: can't open output file %s\n", outfilename);
 384                         fclose(infile);
 385                         return false;
 386                 }
 387         }
 388
 389         if(!init(&encoder_wrapper))
 390                 goto raw_abort_;
 391
 392         /* get the file length */
 393         if(infilesize < 0) {
 394                 encoder_wrapper.total_samples_to_encode = encoder_wrapper.unencoded_size = 0;
 395         }
 396         else {
 397                 encoder_wrapper.unencoded_size = (unsigned)infilesize - skip * bytes_per_wide_sample;
 398                 encoder_wrapper.total_samples_to_encode = (unsigned)infilesize / bytes_per_wide_sample - skip;
 399         }
 400
 401         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode <= 0)
 402                 fprintf(stderr, "(No runtime statistics possible; please wait for encoding to finish...)\n");
 403
 404         if(skip > 0) {
 405                 unsigned skip_bytes = bytes_per_wide_sample * (unsigned)skip;
 406                 if(skip_bytes > lookahead_length) {
 407                         skip_bytes -= lookahead_length;
 408                         lookahead_length = 0;
 409                         if(infile != stdin) {
 410                                 if(-1 == fseek(infile, (long)skip_bytes, SEEK_SET)) {
 411                                         fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 412                                         goto raw_abort_;
 413                                 }
 414                         }
 415                         else {
 416                                 unsigned left, need;
 417                                 const unsigned chunk = sizeof(ucbuffer);
 418                                 for(left = skip_bytes; left > 0; ) {
 419                                         need = min(left, chunk);
 420                                         if(fread(ucbuffer, 1, need, infile) < need) {
 421                                                 fprintf(stderr, "ERROR seeking while skipping samples in input file %s\n", infilename);
 422                                                 goto raw_abort_;
 423                                         }
 424                                         left -= need;
 425                                 }
 426                         }
 427                 }
 428                 else {
 429                         lookahead += skip_bytes;
 430                         lookahead_length -= skip_bytes;
 431                 }
 432         }
 433         else {
 434                 fseek(infile, 0, SEEK_SET);
 435         }
 436
 437         if(!init_encoder(lax, do_mid_side, loose_mid_side, do_exhaustive_model_search, do_qlp_coeff_prec_search, min_residual_partition_order, max_residual_partition_order, rice_parameter_search_dist, max_lpc_order, blocksize, qlp_coeff_precision, channels, bps, sample_rate, padding, requested_seek_points, num_requested_seek_points, &encoder_wrapper))
 438                 goto raw_abort_;
 439
 440         encoder_wrapper.verify_fifo.into_frames = true;
 441
 442         while(!feof(infile)) {
 443                 if(lookahead_length > 0) {
 444                         FLAC__ASSERT(lookahead_length < CHUNK_OF_SAMPLES * bytes_per_wide_sample);
 445                         memcpy(ucbuffer, lookahead, lookahead_length);
 446                         bytes_read = fread(ucbuffer+lookahead_length, sizeof(unsigned char), CHUNK_OF_SAMPLES * bytes_per_wide_sample - lookahead_length, infile) + lookahead_length;
 447                         if(ferror(infile)) {
 448                                 fprintf(stderr, "ERROR reading from %s\n", infilename);
 449                                 goto raw_abort_;
 450                         }
 451                         lookahead_length = 0;
 452                 }
 453                 else
 454                         bytes_read = fread(ucbuffer, sizeof(unsigned char), CHUNK_OF_SAMPLES * bytes_per_wide_sample, infile);
 455
 456                 if(bytes_read == 0) {
 457                         if(ferror(infile)) {
 458                                 fprintf(stderr, "ERROR reading from %s\n", infilename);
 459                                 goto raw_abort_;
 460                         }
 461                 }
 462                 else if(bytes_read % bytes_per_wide_sample != 0) {
 463                         fprintf(stderr, "ERROR, got partial sample from input file %s\n", infilename);
 464                         goto raw_abort_;
 465                 }
 466                 else {
 467                         unsigned wide_samples = bytes_read / bytes_per_wide_sample;
 468                         format_input(wide_samples, is_big_endian, is_unsigned_samples, channels, bps, &encoder_wrapper);
 469
 470                         /* NOTE: some versions of GCC can't figure out const-ness right and will give you an 'incompatible pointer type' warning on arg 2 here: */
 471                         if(!FLAC__stream_encoder_process(encoder_wrapper.encoder, input, wide_samples)) {
 472                                 fprintf(stderr, "ERROR during encoding, state = %d:%s\n", FLAC__stream_encoder_state(encoder_wrapper.encoder), FLAC__StreamEncoderStateString[FLAC__stream_encoder_state(encoder_wrapper.encoder)]);
 473                                 goto raw_abort_;
 474                         }
 475                 }
 476         }
 477
 478         if(encoder_wrapper.encoder) {
 479                 if(FLAC__stream_encoder_state(encoder_wrapper.encoder) == FLAC__STREAM_ENCODER_OK)
 480                         FLAC__stream_encoder_finish(encoder_wrapper.encoder);
 481                 FLAC__stream_encoder_delete(encoder_wrapper.encoder);
 482         }
 483         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0) {
 484                 print_stats(&encoder_wrapper);
 485                 fprintf(stderr, "\n");
 486         }
 487         if(0 != encoder_wrapper.seek_table.points)
 488                 free(encoder_wrapper.seek_table.points);
 489         if(verify) {
 490                 FLAC__stream_decoder_finish(encoder_wrapper.verify_fifo.decoder);
 491                 FLAC__stream_decoder_delete(encoder_wrapper.verify_fifo.decoder);
 492                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 493                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 494                         return 1;
 495                 }
 496                 else if(encoder_wrapper.verbose) {
 497                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 498                 }
 499         }
 500         if(infile != stdin)
 501                 fclose(infile);
 502         return 0;
 503 raw_abort_:
 504         if(encoder_wrapper.verbose && encoder_wrapper.total_samples_to_encode > 0)
 505                 fprintf(stderr, "\n");
 506         if(encoder_wrapper.encoder) {
 507                 if(FLAC__stream_encoder_state(encoder_wrapper.encoder) == FLAC__STREAM_ENCODER_OK)
 508                         FLAC__stream_encoder_finish(encoder_wrapper.encoder);
 509                 FLAC__stream_encoder_delete(encoder_wrapper.encoder);
 510         }
 511         if(0 != encoder_wrapper.seek_table.points)
 512                 free(encoder_wrapper.seek_table.points);
 513         if(verify) {
 514                 FLAC__stream_decoder_finish(encoder_wrapper.verify_fifo.decoder);
 515                 FLAC__stream_decoder_delete(encoder_wrapper.verify_fifo.decoder);
 516                 if(encoder_wrapper.verify_fifo.result != FLAC__VERIFY_OK) {
 517                         fprintf(stderr, "%s: Verify FAILED! (%s)  Do not trust %s\n", infilename, verify_code_string[encoder_wrapper.verify_fifo.result], outfilename);
 518                         return 1;
 519                 }
 520                 else if(encoder_wrapper.verbose) {
 521                         fprintf(stderr, "%s: Verify succeeded\n", infilename);
 522                 }
 523         }
 524         if(infile != stdin)
 525                 fclose(infile);
 526         unlink(outfilename);
 527         return 1;
 528 }
 529
 530 bool init(encoder_wrapper_struct *encoder_wrapper)
 531 {
 532         unsigned i;
 533         uint32 test = 1;
 534
 535         is_big_endian_host = (*((byte*)(&test)))? false : true;
 536
 537         for(i = 0; i < FLAC__MAX_CHANNELS; i++)
 538                 input[i] = &(in[i][0]);
 539
 540         encoder_wrapper->encoder = FLAC__stream_encoder_new();
 541         if(0 == encoder_wrapper->encoder) {
 542                 fprintf(stderr, "ERROR creating the encoder instance\n");
 543                 return false;
 544         }
 545
 546         return true;
 547 }
 548
 549 bool init_encoder(bool lax, bool do_mid_side, bool loose_mid_side, bool do_exhaustive_model_search, bool do_qlp_coeff_prec_search, unsigned min_residual_partition_order, unsigned max_residual_partition_order, unsigned rice_parameter_search_dist, unsigned max_lpc_order, unsigned blocksize, unsigned qlp_coeff_precision, unsigned channels, unsigned bps, unsigned sample_rate, unsigned padding, char *requested_seek_points, int num_requested_seek_points, encoder_wrapper_struct *encoder_wrapper)
 550 {
 551         unsigned i;
 552
 553         if(channels != 2)
 554                 do_mid_side = loose_mid_side = false;
 555
 556         if(encoder_wrapper->verify) {
 557                 /* set up the fifo which will hold the original signal to compare against */
 558                 encoder_wrapper->verify_fifo.size = blocksize + CHUNK_OF_SAMPLES;
 559                 for(i = 0; i < channels; i++) {
 560                         if(0 == (encoder_wrapper->verify_fifo.original[i] = (int32*)malloc(sizeof(int32) * encoder_wrapper->verify_fifo.size))) {
 561                                 fprintf(stderr, "ERROR allocating verify buffers\n");
 562                                 return false;
 563                         }
 564                 }
 565                 encoder_wrapper->verify_fifo.tail = 0;
 566                 encoder_wrapper->verify_fifo.into_frames = false;
 567                 encoder_wrapper->verify_fifo.result = FLAC__VERIFY_OK;
 568
 569                 /* set up a stream decoder for verification */
 570                 encoder_wrapper->verify_fifo.decoder = FLAC__stream_decoder_new();
 571                 if(0 == encoder_wrapper->verify_fifo.decoder) {
 572                         fprintf(stderr, "ERROR creating the verify decoder instance\n");
 573                         return false;
 574                 }
 575                 if(FLAC__stream_decoder_init(encoder_wrapper->verify_fifo.decoder, verify_read_callback, verify_write_callback, verify_metadata_callback, verify_error_callback, encoder_wrapper) != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA) {
 576                         fprintf(stderr, "ERROR initializing decoder, state = %d:%s\n", FLAC__stream_decoder_state(encoder_wrapper->verify_fifo.decoder), FLAC__StreamDecoderStateString[FLAC__stream_decoder_state(encoder_wrapper->verify_fifo.decoder)]);
 577                         return false;
 578                 }
 579         }
 580
 581         if(!convert_to_seek_table(requested_seek_points, num_requested_seek_points, encoder_wrapper->total_samples_to_encode, blocksize, &encoder_wrapper->seek_table)) {
 582                 fprintf(stderr, "ERROR allocating seek table\n");
 583                 return false;
 584         }
 585
 586         if(FLAC__stream_encoder_init(encoder_wrapper->encoder, !lax, do_mid_side, loose_mid_side, channels, bps, sample_rate, blocksize, max_lpc_order, qlp_coeff_precision, do_qlp_coeff_prec_search, do_exhaustive_model_search, min_residual_partition_order, max_residual_partition_order, rice_parameter_search_dist, encoder_wrapper->total_samples_to_encode, (encoder_wrapper->seek_table.num_points > 0)? &encoder_wrapper->seek_table : 0, padding, true /*last_metadata_is_last*/, write_callback, metadata_callback, encoder_wrapper) != FLAC__STREAM_ENCODER_OK) {
 587                 fprintf(stderr, "ERROR initializing encoder, state = %d:%s\n", FLAC__stream_encoder_state(encoder_wrapper->encoder), FLAC__StreamEncoderStateString[FLAC__stream_encoder_state(encoder_wrapper->encoder)]);
 588                 return false;
 589         }
 590
 591         /* the above call writes all the metadata, so we save the stream offset now */
 592         encoder_wrapper->stream_offset = encoder_wrapper->bytes_written;
 593
 594         return true;
 595 }
 596
 597 bool convert_to_seek_table(char *requested_seek_points, int num_requested_seek_points, uint64 stream_samples, unsigned blocksize, FLAC__StreamMetaData_SeekTable *seek_table)
 598 {
 599         unsigned i, j, real_points, placeholders;
 600         char *pt = requested_seek_points, *q;
 601         bool first;
 602
 603         seek_table->num_points = 0;
 604
 605         if(num_requested_seek_points == 0)
 606                 return true;
 607
 608         if(num_requested_seek_points < 0) {
 609                 strcpy(requested_seek_points, "100x<");
 610                 num_requested_seek_points = 1;
 611         }
 612
 613         /* first count how many individual seek point we may need */
 614         real_points = placeholders = 0;
 615         for(i = 0; i < (unsigned)num_requested_seek_points; i++) {
 616                 q = strchr(pt, '<');
 617                 FLAC__ASSERT(0 != q);
 618                 *q = '\0';
 619
 620                 if(0 == strcmp(pt, "X")) { /* -S X */
 621                         placeholders++;
 622                 }
 623                 else if(pt[strlen(pt)-1] == 'x') { /* -S #x */
 624                         if(stream_samples > 0) /* we can only do these if we know the number of samples to encode up front */
 625                                 real_points += (unsigned)atoi(pt);
 626                 }
 627                 else { /* -S # */
 628                         real_points++;
 629                 }
 630                 *q++ = '<';
 631
 632                 pt = q;
 633         }
 634         pt = requested_seek_points;
 635
 636         /* make some space */
 637         if(0 == (seek_table->points = (FLAC__StreamMetaData_SeekPoint*)malloc(sizeof(FLAC__StreamMetaData_SeekPoint) * (real_points+placeholders))))
 638                 return false;
 639
 640         /* initialize the seek_table.  we set frame_samples to zero to signify the points have not yet been hit by a frame write yet. */
 641         for(i = 0; i < real_points+placeholders; i++) {
 642                 seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 643                 seek_table->points[i].stream_offset = 0;
 644                 seek_table->points[i].frame_samples = 0;
 645         }
 646
 647         for(i = 0; i < (unsigned)num_requested_seek_points; i++) {
 648                 q = strchr(pt, '<');
 649                 FLAC__ASSERT(0 != q);
 650                 *q++ = '\0';
 651
 652                 if(0 == strcmp(pt, "X")) { /* -S X */
 653                         ; /* we append placeholders later */
 654                 }
 655                 else if(pt[strlen(pt)-1] == 'x') { /* -S #x */
 656                         if(stream_samples > 0) { /* we can only do these if we know the number of samples to encode up front */
 657                                 unsigned j, n;
 658                                 n = (unsigned)atoi(pt);
 659                                 for(j = 0; j < n; j++)
 660                                         append_point_to_seek_table(seek_table, stream_samples * (uint64)j / (uint64)n, stream_samples, blocksize);
 661                         }
 662                 }
 663                 else { /* -S # */
 664                         append_point_to_seek_table(seek_table, (uint64)atoi(pt), stream_samples, blocksize);
 665                 }
 666
 667                 pt = q;
 668         }
 669
 670         /* sort the seekpoints */
 671         qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetaData_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare);
 672
 673         /* uniqify the seekpoints */
 674         first = true;
 675         for(i = j = 0; i < seek_table->num_points; i++) {
 676                 if(!first) {
 677                         if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)
 678                                 continue;
 679                 }
 680                 first = false;
 681                 seek_table->points[j++] = seek_table->points[i];
 682         }
 683         seek_table->num_points = j;
 684
 685         /* append placeholders */
 686         for(i = 0, j = seek_table->num_points; i < placeholders; i++, j++)
 687                 seek_table->points[j].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 688         seek_table->num_points += placeholders;
 689
 690         return true;
 691 }
 692
 693 void append_point_to_seek_table(FLAC__StreamMetaData_SeekTable *seek_table, uint64 sample, uint64 stream_samples, uint64 blocksize)
 694 {
 695         const uint64 target_sample = (sample / blocksize) * blocksize;
 696
 697         if(stream_samples == 0 || target_sample < stream_samples)
 698                 seek_table->points[seek_table->num_points++].sample_number = target_sample;
 699 }
 700
 701 int seekpoint_compare(const FLAC__StreamMetaData_SeekPoint *l, const FLAC__StreamMetaData_SeekPoint *r)
 702 {
 703         /* we don't just 'return l->sample_number - r->sample_number' since the result (int64) might overflow an 'int' */
 704         if(l->sample_number == r->sample_number)
 705                 return 0;
 706         else if(l->sample_number < r->sample_number)
 707                 return -1;
 708         else
 709                 return 1;
 710 }
 711
 712 void format_input(unsigned wide_samples, bool is_big_endian, bool is_unsigned_samples, unsigned channels, unsigned bps, encoder_wrapper_struct *encoder_wrapper)
 713 {
 714         unsigned wide_sample, sample, channel, byte;
 715
 716         if(bps == 8) {
 717                 if(is_unsigned_samples) {
 718                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 719                                 for(channel = 0; channel < channels; channel++, sample++)
 720                                         input[channel][wide_sample] = (int32)ucbuffer[sample] - 0x80;
 721                 }
 722                 else {
 723                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 724                                 for(channel = 0; channel < channels; channel++, sample++)
 725                                         input[channel][wide_sample] = (int32)scbuffer[sample];
 726                 }
 727         }
 728         else if(bps == 16) {
 729                 if(is_big_endian != is_big_endian_host) {
 730                         unsigned char tmp;
 731                         const unsigned bytes = wide_samples * channels * (bps >> 3);
 732                         for(byte = 0; byte < bytes; byte += 2) {
 733                                 tmp = ucbuffer[byte];
 734                                 ucbuffer[byte] = ucbuffer[byte+1];
 735                                 ucbuffer[byte+1] = tmp;
 736                         }
 737                 }
 738                 if(is_unsigned_samples) {
 739                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 740                                 for(channel = 0; channel < channels; channel++, sample++)
 741                                         input[channel][wide_sample] = (int32)usbuffer[sample] - 0x8000;
 742                 }
 743                 else {
 744                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 745                                 for(channel = 0; channel < channels; channel++, sample++)
 746                                         input[channel][wide_sample] = (int32)ssbuffer[sample];
 747                 }
 748         }
 749         else if(bps == 24) {
 750                 if(!is_big_endian) {
 751                         unsigned char tmp;
 752                         const unsigned bytes = wide_samples * channels * (bps >> 3);
 753                         for(byte = 0; byte < bytes; byte += 3) {
 754                                 tmp = ucbuffer[byte];
 755                                 ucbuffer[byte] = ucbuffer[byte+2];
 756                                 ucbuffer[byte+2] = tmp;
 757                         }
 758                 }
 759                 if(is_unsigned_samples) {
 760                         for(byte = sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 761                                 for(channel = 0; channel < channels; channel++, sample++) {
 762                                         input[channel][wide_sample]  = ucbuffer[byte++]; input[channel][wide_sample] <<= 8;
 763                                         input[channel][wide_sample] |= ucbuffer[byte++]; input[channel][wide_sample] <<= 8;
 764                                         input[channel][wide_sample] |= ucbuffer[byte++];
 765                                         input[channel][wide_sample] -= 0x800000;
 766                                 }
 767                 }
 768                 else {
 769                         for(byte = sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 770                                 for(channel = 0; channel < channels; channel++, sample++) {
 771                                         input[channel][wide_sample]  = scbuffer[byte++]; input[channel][wide_sample] <<= 8;
 772                                         input[channel][wide_sample] |= ucbuffer[byte++]; input[channel][wide_sample] <<= 8;
 773                                         input[channel][wide_sample] |= ucbuffer[byte++];
 774                                 }
 775                 }
 776         }
 777         else {
 778                 FLAC__ASSERT(0);
 779         }
 780
 781         if(encoder_wrapper->verify) {
 782                 for(channel = 0; channel < channels; channel++)
 783                         memcpy(&encoder_wrapper->verify_fifo.original[channel][encoder_wrapper->verify_fifo.tail], &input[channel][0], sizeof(int32) * wide_samples);
 784                 encoder_wrapper->verify_fifo.tail += wide_samples;
 785                 FLAC__ASSERT(encoder_wrapper->verify_fifo.tail <= encoder_wrapper->verify_fifo.size);
 786         }
 787 }
 788
 789 FLAC__StreamEncoderWriteStatus write_callback(const FLAC__StreamEncoder *encoder, const byte buffer[], unsigned bytes, unsigned samples, unsigned current_frame, void *client_data)
 790 {
 791         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 792         const unsigned mask = (FLAC__stream_encoder_do_exhaustive_model_search(encoder) || FLAC__stream_encoder_do_qlp_coeff_prec_search(encoder))? 0x1f : 0x7f;
 793
 794         /* mark the current seek point if hit (if stream_offset == 0 that means we're still writing metadata and haven't hit the first frame yet) */
 795         if(encoder_wrapper->stream_offset > 0 && encoder_wrapper->seek_table.num_points > 0) {
 796                 uint64 current_sample = (uint64)current_frame * (uint64)FLAC__stream_encoder_blocksize(encoder), test_sample;
 797                 unsigned i;
 798                 for(i = encoder_wrapper->first_seek_point_to_check; i < encoder_wrapper->seek_table.num_points; i++) {
 799                         test_sample = encoder_wrapper->seek_table.points[i].sample_number;
 800                         if(test_sample > current_sample) {
 801                                 break;
 802                         }
 803                         else if(test_sample == current_sample) {
 804                                 encoder_wrapper->seek_table.points[i].stream_offset = encoder_wrapper->bytes_written - encoder_wrapper->stream_offset;
 805                                 encoder_wrapper->seek_table.points[i].frame_samples = FLAC__stream_encoder_blocksize(encoder);
 806                                 encoder_wrapper->first_seek_point_to_check++;
 807                                 break;
 808                         }
 809                         else {
 810                                 encoder_wrapper->first_seek_point_to_check++;
 811                         }
 812                 }
 813         }
 814
 815         encoder_wrapper->bytes_written += bytes;
 816         encoder_wrapper->samples_written += samples;
 817         encoder_wrapper->current_frame = current_frame;
 818
 819         if(samples && encoder_wrapper->verbose && encoder_wrapper->total_samples_to_encode > 0 && !(current_frame & mask))
 820                 print_stats(encoder_wrapper);
 821
 822         if(encoder_wrapper->verify) {
 823                 encoder_wrapper->verify_fifo.encoded_signal = buffer;
 824                 encoder_wrapper->verify_fifo.encoded_bytes = bytes;
 825                 if(encoder_wrapper->verify_fifo.into_frames) {
 826                         if(!FLAC__stream_decoder_process_one_frame(encoder_wrapper->verify_fifo.decoder)) {
 827                                 encoder_wrapper->verify_fifo.result = FLAC__VERIFY_FAILED_IN_FRAME;
 828                                 return FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR;
 829                         }
 830                 }
 831                 else {
 832                         if(!FLAC__stream_decoder_process_metadata(encoder_wrapper->verify_fifo.decoder)) {
 833                                 encoder_wrapper->verify_fifo.result = FLAC__VERIFY_FAILED_IN_METADATA;
 834                                 return FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR;
 835                         }
 836                 }
 837         }
 838
 839         if(fwrite(buffer, sizeof(byte), bytes, encoder_wrapper->fout) == bytes)
 840                 return FLAC__STREAM_ENCODER_WRITE_OK;
 841         else
 842                 return FLAC__STREAM_ENCODER_WRITE_FATAL_ERROR;
 843 }
 844
 845 void metadata_callback(const FLAC__StreamEncoder *encoder, const FLAC__StreamMetaData *metadata, void *client_data)
 846 {
 847         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 848         byte b;
 849         FILE *f;
 850         const uint64 samples = metadata->data.stream_info.total_samples;
 851         const unsigned min_framesize = metadata->data.stream_info.min_framesize;
 852         const unsigned max_framesize = metadata->data.stream_info.max_framesize;
 853
 854         FLAC__ASSERT(metadata->type == FLAC__METADATA_TYPE_STREAMINFO);
 855
 856         /*
 857          * we get called by the encoder when the encoding process has
 858          * finished so that we can update the STREAMINFO and SEEKTABLE
 859          * blocks.
 860          */
 861
 862         (void)encoder; /* silence compiler warning about unused parameter */
 863
 864         if(encoder_wrapper->fout == stdout)
 865                 return;
 866
 867         fclose(encoder_wrapper->fout);
 868         if(0 == (f = fopen(encoder_wrapper->outfilename, "r+b")))
 869                 return;
 870
 871         /* all this is based on intimate knowledge of the stream header
 872          * layout, but a change to the header format that would break this
 873          * would also break all streams encoded in the previous format.
 874          */
 875
 876         if(-1 == fseek(f, 26, SEEK_SET)) goto samples_;
 877         fwrite(metadata->data.stream_info.md5sum, 1, 16, f);
 878
 879 samples_:
 880         if(-1 == fseek(f, 21, SEEK_SET)) goto framesize_;
 881         if(fread(&b, 1, 1, f) != 1) goto framesize_;
 882         if(-1 == fseek(f, 21, SEEK_SET)) goto framesize_;
 883         b = (b & 0xf0) | (byte)((samples >> 32) & 0x0F);
 884         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 885         b = (byte)((samples >> 24) & 0xFF);
 886         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 887         b = (byte)((samples >> 16) & 0xFF);
 888         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 889         b = (byte)((samples >> 8) & 0xFF);
 890         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 891         b = (byte)(samples & 0xFF);
 892         if(fwrite(&b, 1, 1, f) != 1) goto framesize_;
 893
 894 framesize_:
 895         if(-1 == fseek(f, 12, SEEK_SET)) goto seektable_;
 896         b = (byte)((min_framesize >> 16) & 0xFF);
 897         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 898         b = (byte)((min_framesize >> 8) & 0xFF);
 899         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 900         b = (byte)(min_framesize & 0xFF);
 901         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 902         b = (byte)((max_framesize >> 16) & 0xFF);
 903         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 904         b = (byte)((max_framesize >> 8) & 0xFF);
 905         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 906         b = (byte)(max_framesize & 0xFF);
 907         if(fwrite(&b, 1, 1, f) != 1) goto seektable_;
 908
 909 seektable_:
 910         if(encoder_wrapper->seek_table.num_points > 0) {
 911                 long pos;
 912                 unsigned i;
 913
 914                 /* convert any unused seek points to placeholders */
 915                 for(i = 0; i < encoder_wrapper->seek_table.num_points; i++) {
 916                         if(encoder_wrapper->seek_table.points[i].sample_number == FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER)
 917                                 break;
 918                         else if(encoder_wrapper->seek_table.points[i].frame_samples == 0)
 919                                 encoder_wrapper->seek_table.points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
 920                 }
 921
 922                 /* the offset of the seek table data 'pos' should be after then stream sync and STREAMINFO block and SEEKTABLE header */
 923                 pos = (FLAC__STREAM_SYNC_LEN + FLAC__STREAM_METADATA_IS_LAST_LEN + FLAC__STREAM_METADATA_TYPE_LEN + FLAC__STREAM_METADATA_LENGTH_LEN) / 8;
 924                 pos += metadata->length;
 925                 pos += (FLAC__STREAM_METADATA_IS_LAST_LEN + FLAC__STREAM_METADATA_TYPE_LEN + FLAC__STREAM_METADATA_LENGTH_LEN) / 8;
 926                 if(-1 == fseek(f, pos, SEEK_SET)) goto end_;
 927                 for(i = 0; i < encoder_wrapper->seek_table.num_points; i++) {
 928                         if(!write_big_endian_uint64(f, encoder_wrapper->seek_table.points[i].sample_number)) goto end_;
 929                         if(!write_big_endian_uint64(f, encoder_wrapper->seek_table.points[i].stream_offset)) goto end_;
 930                         if(!write_big_endian_uint16(f, encoder_wrapper->seek_table.points[i].frame_samples)) goto end_;
 931                 }
 932         }
 933
 934 end_:
 935         fclose(f);
 936         return;
 937 }
 938
 939 FLAC__StreamDecoderReadStatus verify_read_callback(const FLAC__StreamDecoder *decoder, byte buffer[], unsigned *bytes, void *client_data)
 940 {
 941         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 942         const unsigned encoded_bytes = encoder_wrapper->verify_fifo.encoded_bytes;
 943         (void)decoder;
 944
 945         if(encoded_bytes <= *bytes) {
 946                 *bytes = encoded_bytes;
 947                 memcpy(buffer, encoder_wrapper->verify_fifo.encoded_signal, *bytes);
 948         }
 949         else {
 950                 memcpy(buffer, encoder_wrapper->verify_fifo.encoded_signal, *bytes);
 951                 encoder_wrapper->verify_fifo.encoded_signal += *bytes;
 952                 encoder_wrapper->verify_fifo.encoded_bytes -= *bytes;
 953         }
 954
 955         return FLAC__STREAM_DECODER_READ_CONTINUE;
 956 }
 957
 958 FLAC__StreamDecoderWriteStatus verify_write_callback(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data)
 959 {
 960         encoder_wrapper_struct *encoder_wrapper = (encoder_wrapper_struct *)client_data;
 961         unsigned channel, l, r;
 962         const unsigned channels = FLAC__stream_decoder_channels(decoder);
 963         const unsigned bytes_per_block = sizeof(int32) * FLAC__stream_decoder_blocksize(decoder);
 964
 965         for(channel = 0; channel < channels; channel++) {
 966                 if(0 != memcmp(buffer[channel], encoder_wrapper->verify_fifo.original[channel], bytes_per_block)) {
 967                         fprintf(stderr, "\nERROR: mismatch in decoded data, verify FAILED!\n");
 968                         fprintf(stderr, "       Please submit a bug report to\n");
 969                         fprintf(stderr, "           http://sourceforge.net/bugs/?func=addbug&group_id=13478\n");
 970                         fprintf(stderr, "       Make sure to include an email contact in the comment and/or use the\n");
 971                         fprintf(stderr, "       \"Monitor\" feature to monitor the bug status.\n");
 972                         return FLAC__STREAM_DECODER_WRITE_ABORT;
 973                 }
 974         }
 975         /* dequeue the frame from the fifo */
 976         for(channel = 0; channel < channels; channel++) {
 977                 for(l = 0, r = frame->header.blocksize; r < encoder_wrapper->verify_fifo.tail; l++, r++) {
 978                         encoder_wrapper->verify_fifo.original[channel][l] = encoder_wrapper->verify_fifo.original[channel][r];
 979                 }
 980         }
 981         encoder_wrapper->verify_fifo.tail -= frame->header.blocksize;
 982         return FLAC__STREAM_DECODER_WRITE_CONTINUE;
 983 }
 984
 985 void verify_metadata_callback(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)
 986 {
 987         (void)decoder;
 988         (void)metadata;
 989         (void)client_data;
 990 }
 991
 992 void verify_error_callback(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 993 {
 994         (void)decoder;
 995         (void)client_data;
 996         fprintf(stderr, "\nERROR: verification decoder returned error %d:%s\n", status, FLAC__StreamDecoderErrorStatusString[status]);
 997 }
 998
 999 void print_stats(const encoder_wrapper_struct *encoder_wrapper)
1000 {
1001 #ifdef _MSC_VER
1002         /* with VC++ you have to spoon feed it the casting */
1003         double progress = (double)(int64)encoder_wrapper->samples_written / (double)(int64)encoder_wrapper->total_samples_to_encode;
1004 #else
1005         double progress = (double)encoder_wrapper->samples_written / (double)encoder_wrapper->total_samples_to_encode;
1006 #endif
1007         fprintf(stderr, "\r%0.2f%% complete: frame %u, wrote %u bytes (%u/%u samples), r=%5.3f",
1008                 progress * 100.0, encoder_wrapper->current_frame,
1009                 (unsigned)encoder_wrapper->bytes_written, (unsigned)encoder_wrapper->samples_written, (unsigned)encoder_wrapper->total_samples_to_encode,
1010 #ifdef _MSC_VER
1011                 /* with VC++ you have to spoon feed it the casting */
1012                 (double)(int64)encoder_wrapper->bytes_written / ((double)(int64)encoder_wrapper->unencoded_size * progress)
1013 #else
1014                 (double)encoder_wrapper->bytes_written / ((double)encoder_wrapper->unencoded_size * progress)
1015 #endif
1016         );
1017 }
1018
1019 bool read_little_endian_uint16(FILE *f, uint16 *val, bool eof_ok)
1020 {
1021         size_t bytes_read = fread(val, 1, 2, f);
1022
1023         if(bytes_read == 0) {
1024                 if(!eof_ok) {
1025                         fprintf(stderr, "ERROR: unexpected EOF\n");
1026                         return false;
1027                 }
1028                 else
1029                         return true;
1030         }
1031         else if(bytes_read < 2) {
1032                 fprintf(stderr, "ERROR: unexpected EOF\n");
1033                 return false;
1034         }
1035         else {
1036                 if(is_big_endian_host) {
1037                         byte tmp, *b = (byte*)val;
1038                         tmp = b[1]; b[1] = b[0]; b[0] = tmp;
1039                 }
1040                 return true;
1041         }
1042 }
1043
1044 bool read_little_endian_uint32(FILE *f, uint32 *val, bool eof_ok)
1045 {
1046         size_t bytes_read = fread(val, 1, 4, f);
1047
1048         if(bytes_read == 0) {
1049                 if(!eof_ok) {
1050                         fprintf(stderr, "ERROR: unexpected EOF\n");
1051                         return false;
1052                 }
1053                 else
1054                         return true;
1055         }
1056         else if(bytes_read < 4) {
1057                 fprintf(stderr, "ERROR: unexpected EOF\n");
1058                 return false;
1059         }
1060         else {
1061                 if(is_big_endian_host) {
1062                         byte tmp, *b = (byte*)val;
1063                         tmp = b[3]; b[3] = b[0]; b[0] = tmp;
1064                         tmp = b[2]; b[2] = b[1]; b[1] = tmp;
1065                 }
1066                 return true;
1067         }
1068 }
1069
1070 bool write_big_endian_uint16(FILE *f, uint16 val)
1071 {
1072         if(!is_big_endian_host) {
1073                 byte *b = (byte *)&val, tmp;
1074                 tmp = b[0]; b[0] = b[1]; b[1] = tmp;
1075         }
1076         return fwrite(&val, 1, 2, f) == 2;
1077 }
1078
1079 bool write_big_endian_uint64(FILE *f, uint64 val)
1080 {
1081         if(!is_big_endian_host) {
1082                 byte *b = (byte *)&val, tmp;
1083                 tmp = b[0]; b[0] = b[7]; b[7] = tmp;
1084                 tmp = b[1]; b[1] = b[6]; b[6] = tmp;
1085                 tmp = b[2]; b[2] = b[5]; b[5] = tmp;
1086                 tmp = b[3]; b[3] = b[4]; b[4] = tmp;
1087         }
1088         return fwrite(&val, 1, 8, f) == 8;
1089 }