src/flac/decode.c

   1 /* flac - Command-line FLAC encoder/decoder
   2  * Copyright (C) 2000,2001,2002,2003,2004  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 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #if defined _WIN32 && !defined __CYGWIN__
  24 /* where MSVC puts unlink() */
  25 # include <io.h>
  26 #else
  27 # include <unistd.h>
  28 #endif
  29 #include <math.h> /* for floor() */
  30 #include <stdio.h> /* for FILE et al. */
  31 #include <string.h> /* for strcmp() */
  32 #include "FLAC/all.h"
  33 #include "share/grabbag.h"
  34 #include "share/replaygain_synthesis.h"
  35 #include "decode.h"
  36
  37 #ifdef FLAC__HAS_OGG
  38 #include "OggFLAC/file_decoder.h"
  39 #endif
  40
  41 typedef struct {
  42 #ifdef FLAC__HAS_OGG
  43         FLAC__bool is_ogg;
  44 #endif
  45
  46         FLAC__bool verbose;
  47         FLAC__bool is_aiff_out;
  48         FLAC__bool is_wave_out;
  49         FLAC__bool continue_through_decode_errors;
  50
  51         struct {
  52                 replaygain_synthesis_spec_t spec;
  53                 FLAC__bool apply; /* 'spec.apply' is just a request; this 'apply' means we actually parsed the RG tags and are ready to go */
  54                 double scale;
  55                 DitherContext dither_context;
  56         } replaygain;
  57
  58         FLAC__bool test_only;
  59         FLAC__bool analysis_mode;
  60         analysis_options aopts;
  61         utils__SkipUntilSpecification *skip_specification;
  62         utils__SkipUntilSpecification *until_specification; /* a canonicalized value of 0 mean end-of-stream (i.e. --until=-0) */
  63         utils__CueSpecification *cue_specification;
  64
  65         const char *inbasefilename;
  66         const char *outfilename;
  67
  68         FLAC__uint64 samples_processed;
  69         unsigned frame_counter;
  70         FLAC__bool abort_flag;
  71         FLAC__bool aborting_due_to_until; /* true if we intentionally abort decoding prematurely because we hit the --until point */
  72
  73         struct {
  74                 FLAC__bool needs_fixup;
  75                 unsigned riff_offset; /* or FORM offset for AIFF */
  76                 unsigned data_offset; /* or SSND offset for AIFF */
  77                 unsigned frames_offset; /* AIFF only */
  78         } wave_chunk_size_fixup;
  79
  80         FLAC__bool is_big_endian;
  81         FLAC__bool is_unsigned_samples;
  82         FLAC__uint64 total_samples;
  83         unsigned bps;
  84         unsigned channels;
  85         unsigned sample_rate;
  86
  87         union {
  88                 union {
  89                         FLAC__FileDecoder *file;
  90                 } flac;
  91 #ifdef FLAC__HAS_OGG
  92                 union {
  93                         OggFLAC__FileDecoder *file;
  94                 } ogg;
  95 #endif
  96         } decoder;
  97
  98         FILE *fout;
  99 } DecoderSession;
 100
 101
 102 static FLAC__bool is_big_endian_host_;
 103
 104
 105 /*
 106  * local routines
 107  */
 108 static FLAC__bool DecoderSession_construct(DecoderSession *d, FLAC__bool is_ogg, FLAC__bool verbose, FLAC__bool is_aiff_out, FLAC__bool is_wave_out, FLAC__bool continue_through_decode_errors, replaygain_synthesis_spec_t replaygain_synthesis_spec, FLAC__bool analysis_mode, analysis_options aopts, utils__SkipUntilSpecification *skip_specification, utils__SkipUntilSpecification *until_specification, utils__CueSpecification *cue_specification, const char *infilename, const char *outfilename);
 109 static void DecoderSession_destroy(DecoderSession *d, FLAC__bool error_occurred);
 110 static FLAC__bool DecoderSession_init_decoder(DecoderSession *d, decode_options_t decode_options, const char *infilename);
 111 static FLAC__bool DecoderSession_process(DecoderSession *d);
 112 static int DecoderSession_finish_ok(DecoderSession *d);
 113 static int DecoderSession_finish_error(DecoderSession *d);
 114 static FLAC__bool canonicalize_until_specification(utils__SkipUntilSpecification *spec, const char *inbasefilename, unsigned sample_rate, FLAC__uint64 skip, FLAC__uint64 total_samples_in_input);
 115 static FLAC__bool write_necessary_headers(DecoderSession *decoder_session);
 116 static FLAC__bool write_little_endian_uint16(FILE *f, FLAC__uint16 val);
 117 static FLAC__bool write_little_endian_uint32(FILE *f, FLAC__uint32 val);
 118 static FLAC__bool write_big_endian_uint16(FILE *f, FLAC__uint16 val);
 119 static FLAC__bool write_big_endian_uint32(FILE *f, FLAC__uint32 val);
 120 static FLAC__bool write_sane_extended(FILE *f, unsigned val);
 121 static FLAC__bool fixup_wave_chunk_size(const char *outfilename, FLAC__bool is_wave_out, unsigned riff_offset, unsigned data_offset, unsigned frames_offset, FLAC__uint32 total_samples, unsigned channels, unsigned bps);
 122 /*
 123  * We use 'void *' so that we can use the same callbacks for the
 124  * FLAC__StreamDecoder and FLAC__FileDecoder.  The 'decoder' argument is
 125  * actually never used in the callbacks.
 126  */
 127 static FLAC__StreamDecoderWriteStatus write_callback(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data);
 128 static void metadata_callback(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
 129 static void error_callback(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
 130 static void print_error_with_state(const DecoderSession *d, const char *message);
 131 static void print_stats(const DecoderSession *decoder_session);
 132
 133
 134 /*
 135  * public routines
 136  */
 137 int flac__decode_aiff(const char *infilename, const char *outfilename, FLAC__bool analysis_mode, analysis_options aopts, wav_decode_options_t options)
 138 {
 139         DecoderSession decoder_session;
 140
 141         if(!
 142                 DecoderSession_construct(
 143                         &decoder_session,
 144 #ifdef FLAC__HAS_OGG
 145                         options.common.is_ogg,
 146 #else
 147                         /*is_ogg=*/false,
 148 #endif
 149                         options.common.verbose,
 150                         /*is_aiff_out=*/true,
 151                         /*is_wave_out=*/false,
 152                         options.common.continue_through_decode_errors,
 153                         options.common.replaygain_synthesis_spec,
 154                         analysis_mode,
 155                         aopts,
 156                         &options.common.skip_specification,
 157                         &options.common.until_specification,
 158                         options.common.has_cue_specification? &options.common.cue_specification : 0,
 159                         infilename,
 160                         outfilename
 161                 )
 162         )
 163                 return 1;
 164
 165         if(!DecoderSession_init_decoder(&decoder_session, options.common, infilename))
 166                 return DecoderSession_finish_error(&decoder_session);
 167
 168         if(!DecoderSession_process(&decoder_session))
 169                 return DecoderSession_finish_error(&decoder_session);
 170
 171         return DecoderSession_finish_ok(&decoder_session);
 172 }
 173
 174 int flac__decode_wav(const char *infilename, const char *outfilename, FLAC__bool analysis_mode, analysis_options aopts, wav_decode_options_t options)
 175 {
 176         DecoderSession decoder_session;
 177
 178         if(!
 179                 DecoderSession_construct(
 180                         &decoder_session,
 181 #ifdef FLAC__HAS_OGG
 182                         options.common.is_ogg,
 183 #else
 184                         /*is_ogg=*/false,
 185 #endif
 186                         options.common.verbose,
 187                         /*is_aiff_out=*/false,
 188                         /*is_wave_out=*/true,
 189                         options.common.continue_through_decode_errors,
 190                         options.common.replaygain_synthesis_spec,
 191                         analysis_mode,
 192                         aopts,
 193                         &options.common.skip_specification,
 194                         &options.common.until_specification,
 195                         options.common.has_cue_specification? &options.common.cue_specification : 0,
 196                         infilename,
 197                         outfilename
 198                 )
 199         )
 200                 return 1;
 201
 202         if(!DecoderSession_init_decoder(&decoder_session, options.common, infilename))
 203                 return DecoderSession_finish_error(&decoder_session);
 204
 205         if(!DecoderSession_process(&decoder_session))
 206                 return DecoderSession_finish_error(&decoder_session);
 207
 208         return DecoderSession_finish_ok(&decoder_session);
 209 }
 210
 211 int flac__decode_raw(const char *infilename, const char *outfilename, FLAC__bool analysis_mode, analysis_options aopts, raw_decode_options_t options)
 212 {
 213         DecoderSession decoder_session;
 214
 215         decoder_session.is_big_endian = options.is_big_endian;
 216         decoder_session.is_unsigned_samples = options.is_unsigned_samples;
 217
 218         if(!
 219                 DecoderSession_construct(
 220                         &decoder_session,
 221 #ifdef FLAC__HAS_OGG
 222                         options.common.is_ogg,
 223 #else
 224                         /*is_ogg=*/false,
 225 #endif
 226                         options.common.verbose,
 227                         /*is_aiff_out=*/false,
 228                         /*is_wave_out=*/false,
 229                         options.common.continue_through_decode_errors,
 230                         options.common.replaygain_synthesis_spec,
 231                         analysis_mode,
 232                         aopts,
 233                         &options.common.skip_specification,
 234                         &options.common.until_specification,
 235                         options.common.has_cue_specification? &options.common.cue_specification : 0,
 236                         infilename,
 237                         outfilename
 238                 )
 239         )
 240                 return 1;
 241
 242         if(!DecoderSession_init_decoder(&decoder_session, options.common, infilename))
 243                 return DecoderSession_finish_error(&decoder_session);
 244
 245         if(!DecoderSession_process(&decoder_session))
 246                 return DecoderSession_finish_error(&decoder_session);
 247
 248         return DecoderSession_finish_ok(&decoder_session);
 249 }
 250
 251 FLAC__bool DecoderSession_construct(DecoderSession *d, FLAC__bool is_ogg, FLAC__bool verbose, FLAC__bool is_aiff_out, FLAC__bool is_wave_out, FLAC__bool continue_through_decode_errors, replaygain_synthesis_spec_t replaygain_synthesis_spec, FLAC__bool analysis_mode, analysis_options aopts, utils__SkipUntilSpecification *skip_specification, utils__SkipUntilSpecification *until_specification, utils__CueSpecification *cue_specification, const char *infilename, const char *outfilename)
 252 {
 253 #ifdef FLAC__HAS_OGG
 254         d->is_ogg = is_ogg;
 255 #else
 256         (void)is_ogg;
 257 #endif
 258
 259         d->verbose = verbose;
 260         d->is_aiff_out = is_aiff_out;
 261         d->is_wave_out = is_wave_out;
 262         d->continue_through_decode_errors = continue_through_decode_errors;
 263         d->replaygain.spec = replaygain_synthesis_spec;
 264         d->replaygain.apply = false;
 265         d->replaygain.scale = 0.0;
 266         /* d->replaygain.dither_context gets initialized later once we know the sample resolution */
 267         d->test_only = (0 == outfilename);
 268         d->analysis_mode = analysis_mode;
 269         d->aopts = aopts;
 270         d->skip_specification = skip_specification;
 271         d->until_specification = until_specification;
 272         d->cue_specification = cue_specification;
 273
 274         d->inbasefilename = grabbag__file_get_basename(infilename);
 275         d->outfilename = outfilename;
 276
 277         d->samples_processed = 0;
 278         d->frame_counter = 0;
 279         d->abort_flag = false;
 280         d->aborting_due_to_until = false;
 281
 282         d->wave_chunk_size_fixup.needs_fixup = false;
 283
 284         d->decoder.flac.file = 0;
 285 #ifdef FLAC__HAS_OGG
 286         d->decoder.ogg.file = 0;
 287 #endif
 288
 289         d->fout = 0; /* initialized with an open file later if necessary */
 290
 291         FLAC__ASSERT(!(d->test_only && d->analysis_mode));
 292
 293         if(!d->test_only) {
 294                 if(0 == strcmp(outfilename, "-")) {
 295                         d->fout = grabbag__file_get_binary_stdout();
 296                 }
 297                 else {
 298                         if(0 == (d->fout = fopen(outfilename, "wb"))) {
 299                                 fprintf(stderr, "%s: ERROR: can't open output file %s\n", d->inbasefilename, outfilename);
 300                                 DecoderSession_destroy(d, /*error_occurred=*/true);
 301                                 return false;
 302                         }
 303                 }
 304         }
 305
 306         if(analysis_mode)
 307                 flac__analyze_init(aopts);
 308
 309         return true;
 310 }
 311
 312 void DecoderSession_destroy(DecoderSession *d, FLAC__bool error_occurred)
 313 {
 314         if(0 != d->fout && d->fout != stdout) {
 315                 fclose(d->fout);
 316                 if(error_occurred)
 317                         unlink(d->outfilename);
 318         }
 319 }
 320
 321 FLAC__bool DecoderSession_init_decoder(DecoderSession *decoder_session, decode_options_t decode_options, const char *infilename)
 322 {
 323         FLAC__uint32 test = 1;
 324
 325         is_big_endian_host_ = (*((FLAC__byte*)(&test)))? false : true;
 326
 327 #ifdef FLAC__HAS_OGG
 328         if(decoder_session->is_ogg) {
 329                 decoder_session->decoder.ogg.file = OggFLAC__file_decoder_new();
 330
 331                 if(0 == decoder_session->decoder.ogg.file) {
 332                         fprintf(stderr, "%s: ERROR creating the decoder instance\n", decoder_session->inbasefilename);
 333                         return false;
 334                 }
 335
 336                 OggFLAC__file_decoder_set_md5_checking(decoder_session->decoder.ogg.file, true);
 337                 OggFLAC__file_decoder_set_filename(decoder_session->decoder.ogg.file, infilename);
 338                 if(!decode_options.use_first_serial_number)
 339                         OggFLAC__file_decoder_set_serial_number(decoder_session->decoder.ogg.file, decode_options.serial_number);
 340                 if (0 != decoder_session->cue_specification)
 341                         OggFLAC__file_decoder_set_metadata_respond(decoder_session->decoder.ogg.file, FLAC__METADATA_TYPE_CUESHEET);
 342                 if (decoder_session->replaygain.spec.apply)
 343                         OggFLAC__file_decoder_set_metadata_respond(decoder_session->decoder.ogg.file, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 344
 345                 /*
 346                  * The three ugly casts here are to 'downcast' the 'void *' argument of
 347                  * the callback down to 'OggFLAC__FileDecoder *'.  In C++ this would be
 348                  * unnecessary but here the cast makes the C compiler happy.
 349                  */
 350                 OggFLAC__file_decoder_set_write_callback(decoder_session->decoder.ogg.file, (FLAC__StreamDecoderWriteStatus (*)(const OggFLAC__FileDecoder *, const FLAC__Frame *, const FLAC__int32 * const [], void *))write_callback);
 351                 OggFLAC__file_decoder_set_metadata_callback(decoder_session->decoder.ogg.file, (void (*)(const OggFLAC__FileDecoder *, const FLAC__StreamMetadata *, void *))metadata_callback);
 352                 OggFLAC__file_decoder_set_error_callback(decoder_session->decoder.ogg.file, (void (*)(const OggFLAC__FileDecoder *, FLAC__StreamDecoderErrorStatus, void *))error_callback);
 353                 OggFLAC__file_decoder_set_client_data(decoder_session->decoder.ogg.file, decoder_session);
 354
 355                 if(OggFLAC__file_decoder_init(decoder_session->decoder.ogg.file) != OggFLAC__FILE_DECODER_OK) {
 356                         print_error_with_state(decoder_session, "ERROR initializing decoder");
 357                         return false;
 358                 }
 359         }
 360         else
 361 #else
 362         (void)decode_options;
 363 #endif
 364         {
 365                 decoder_session->decoder.flac.file = FLAC__file_decoder_new();
 366
 367                 if(0 == decoder_session->decoder.flac.file) {
 368                         fprintf(stderr, "%s: ERROR creating the decoder instance\n", decoder_session->inbasefilename);
 369                         return false;
 370                 }
 371
 372                 FLAC__file_decoder_set_md5_checking(decoder_session->decoder.flac.file, true);
 373                 FLAC__file_decoder_set_filename(decoder_session->decoder.flac.file, infilename);
 374                 if (0 != decoder_session->cue_specification)
 375                         FLAC__file_decoder_set_metadata_respond(decoder_session->decoder.flac.file, FLAC__METADATA_TYPE_CUESHEET);
 376                 if (decoder_session->replaygain.spec.apply)
 377                         FLAC__file_decoder_set_metadata_respond(decoder_session->decoder.flac.file, FLAC__METADATA_TYPE_VORBIS_COMMENT);
 378                 /*
 379                  * The three ugly casts here are to 'downcast' the 'void *' argument of
 380                  * the callback down to 'FLAC__FileDecoder *'.
 381                  */
 382                 FLAC__file_decoder_set_write_callback(decoder_session->decoder.flac.file, (FLAC__StreamDecoderWriteStatus (*)(const FLAC__FileDecoder *, const FLAC__Frame *, const FLAC__int32 * const [], void *))write_callback);
 383                 FLAC__file_decoder_set_metadata_callback(decoder_session->decoder.flac.file, (void (*)(const FLAC__FileDecoder *, const FLAC__StreamMetadata *, void *))metadata_callback);
 384                 FLAC__file_decoder_set_error_callback(decoder_session->decoder.flac.file, (void (*)(const FLAC__FileDecoder *, FLAC__StreamDecoderErrorStatus, void *))error_callback);
 385                 FLAC__file_decoder_set_client_data(decoder_session->decoder.flac.file, decoder_session);
 386
 387                 if(FLAC__file_decoder_init(decoder_session->decoder.flac.file) != FLAC__FILE_DECODER_OK) {
 388                         print_error_with_state(decoder_session, "ERROR initializing decoder");
 389                         return false;
 390                 }
 391         }
 392
 393         return true;
 394 }
 395
 396 FLAC__bool DecoderSession_process(DecoderSession *d)
 397 {
 398 #ifdef FLAC__HAS_OGG
 399         if(d->is_ogg) {
 400                 if(!OggFLAC__file_decoder_process_until_end_of_metadata(d->decoder.ogg.file)) {
 401                         if(d->verbose) fprintf(stderr, "\n");
 402                         print_error_with_state(d, "ERROR while decoding metadata");
 403                         return false;
 404                 }
 405                 if(OggFLAC__file_decoder_get_state(d->decoder.ogg.file) != OggFLAC__FILE_DECODER_OK && OggFLAC__file_decoder_get_state(d->decoder.ogg.file) != OggFLAC__FILE_DECODER_END_OF_FILE) {
 406                         if(d->verbose) fprintf(stderr, "\n");
 407                         print_error_with_state(d, "ERROR during metadata decoding");
 408                         return false;
 409                 }
 410         }
 411         else
 412 #endif
 413         {
 414                 if(!FLAC__file_decoder_process_until_end_of_metadata(d->decoder.flac.file)) {
 415                         if(d->verbose) fprintf(stderr, "\n");
 416                         print_error_with_state(d, "ERROR while decoding metadata");
 417                         return false;
 418                 }
 419                 if(FLAC__file_decoder_get_state(d->decoder.flac.file) != FLAC__FILE_DECODER_OK && FLAC__file_decoder_get_state(d->decoder.flac.file) != FLAC__FILE_DECODER_END_OF_FILE) {
 420                         if(d->verbose) fprintf(stderr, "\n");
 421                         print_error_with_state(d, "ERROR during metadata decoding");
 422                         return false;
 423                 }
 424         }
 425         if(d->abort_flag)
 426                 return false;
 427
 428         /* write the WAVE/AIFF headers if necessary */
 429         if(!write_necessary_headers(d)) {
 430                 d->abort_flag = true;
 431                 return false;
 432         }
 433
 434         if(d->skip_specification->value.samples > 0) {
 435                 const FLAC__uint64 skip = (FLAC__uint64)d->skip_specification->value.samples;
 436
 437 #ifdef FLAC__HAS_OGG
 438                 if(d->is_ogg) {
 439                         if(!OggFLAC__file_decoder_seek_absolute(d->decoder.ogg.file, skip)) {
 440                                 print_error_with_state(d, "ERROR seeking while skipping bytes");
 441                                 return false;
 442                         }
 443                         if(!OggFLAC__file_decoder_process_until_end_of_file(d->decoder.ogg.file) && !d->aborting_due_to_until) {
 444                                 if(d->verbose) fprintf(stderr, "\n");
 445                                 print_error_with_state(d, "ERROR while decoding frames");
 446                                 return false;
 447                         }
 448                         if(OggFLAC__file_decoder_get_state(d->decoder.ogg.file) != OggFLAC__FILE_DECODER_OK && OggFLAC__file_decoder_get_state(d->decoder.ogg.file) != OggFLAC__FILE_DECODER_END_OF_FILE && !d->aborting_due_to_until) {
 449                                 if(d->verbose) fprintf(stderr, "\n");
 450                                 print_error_with_state(d, "ERROR during decoding");
 451                                 return false;
 452                         }
 453                 }
 454                 else
 455 #endif
 456                 {
 457                         if(!FLAC__file_decoder_seek_absolute(d->decoder.flac.file, skip)) {
 458                                 print_error_with_state(d, "ERROR seeking while skipping bytes");
 459                                 return false;
 460                         }
 461                         if(!FLAC__file_decoder_process_until_end_of_file(d->decoder.flac.file) && !d->aborting_due_to_until) {
 462                                 if(d->verbose) fprintf(stderr, "\n");
 463                                 print_error_with_state(d, "ERROR while decoding frames");
 464                                 return false;
 465                         }
 466                         if(FLAC__file_decoder_get_state(d->decoder.flac.file) != FLAC__FILE_DECODER_OK && FLAC__file_decoder_get_state(d->decoder.flac.file) != FLAC__FILE_DECODER_END_OF_FILE && !d->aborting_due_to_until) {
 467                                 if(d->verbose) fprintf(stderr, "\n");
 468                                 print_error_with_state(d, "ERROR during decoding");
 469                                 return false;
 470                         }
 471                 }
 472         }
 473         else {
 474 #ifdef FLAC__HAS_OGG
 475                 if(d->is_ogg) {
 476                         if(!OggFLAC__file_decoder_process_until_end_of_file(d->decoder.ogg.file) && !d->aborting_due_to_until) {
 477                                 if(d->verbose) fprintf(stderr, "\n");
 478                                 print_error_with_state(d, "ERROR while decoding data");
 479                                 return false;
 480                         }
 481                         if(OggFLAC__file_decoder_get_state(d->decoder.ogg.file) != OggFLAC__FILE_DECODER_OK && OggFLAC__file_decoder_get_state(d->decoder.ogg.file) != OggFLAC__FILE_DECODER_END_OF_FILE && !d->aborting_due_to_until) {
 482                                 if(d->verbose) fprintf(stderr, "\n");
 483                                 print_error_with_state(d, "ERROR during decoding");
 484                                 return false;
 485                         }
 486                 }
 487                 else
 488 #endif
 489                 {
 490                         if(!FLAC__file_decoder_process_until_end_of_file(d->decoder.flac.file) && !d->aborting_due_to_until) {
 491                                 if(d->verbose) fprintf(stderr, "\n");
 492                                 print_error_with_state(d, "ERROR while decoding data");
 493                                 return false;
 494                         }
 495                         if(FLAC__file_decoder_get_state(d->decoder.flac.file) != FLAC__FILE_DECODER_OK && FLAC__file_decoder_get_state(d->decoder.flac.file) != FLAC__FILE_DECODER_END_OF_FILE && !d->aborting_due_to_until) {
 496                                 if(d->verbose) fprintf(stderr, "\n");
 497                                 print_error_with_state(d, "ERROR during decoding");
 498                                 return false;
 499                         }
 500                 }
 501         }
 502
 503         if(d->is_aiff_out && ((d->total_samples * d->channels * ((d->bps+7)/8)) & 1)) {
 504                 if(flac__utils_fwrite("\000", 1, 1, d->fout) != 1) {
 505                         print_error_with_state(d, "ERROR writing pad byte to AIFF SSND chunk");
 506                         return false;
 507                 }
 508         }
 509
 510         return true;
 511 }
 512
 513 int DecoderSession_finish_ok(DecoderSession *d)
 514 {
 515         FLAC__bool md5_failure = false;
 516
 517 #ifdef FLAC__HAS_OGG
 518         if(d->is_ogg) {
 519                 if(d->decoder.ogg.file) {
 520                         md5_failure = !OggFLAC__file_decoder_finish(d->decoder.ogg.file) && !d->aborting_due_to_until;
 521                         print_stats(d);
 522                         OggFLAC__file_decoder_delete(d->decoder.ogg.file);
 523                 }
 524         }
 525         else
 526 #endif
 527         {
 528                 if(d->decoder.flac.file) {
 529                         md5_failure = !FLAC__file_decoder_finish(d->decoder.flac.file) && !d->aborting_due_to_until;
 530                         print_stats(d);
 531                         FLAC__file_decoder_delete(d->decoder.flac.file);
 532                 }
 533         }
 534         if(d->analysis_mode)
 535                 flac__analyze_finish(d->aopts);
 536         if(md5_failure) {
 537                 fprintf(stderr, "\r%s: WARNING, MD5 signature mismatch\n", d->inbasefilename);
 538         }
 539         else {
 540                 if(d->verbose)
 541                         fprintf(stderr, "\r%s: %s         \n", d->inbasefilename, d->test_only? "ok           ":d->analysis_mode?"done           ":"done");
 542         }
 543         DecoderSession_destroy(d, /*error_occurred=*/false);
 544         if((d->is_wave_out || d->is_aiff_out) && d->wave_chunk_size_fixup.needs_fixup)
 545                 if(!fixup_wave_chunk_size(d->outfilename, d->is_wave_out, d->wave_chunk_size_fixup.riff_offset, d->wave_chunk_size_fixup.data_offset, d->wave_chunk_size_fixup.frames_offset, (FLAC__uint32)d->samples_processed, d->channels, d->bps))
 546                         return 1;
 547         return 0;
 548 }
 549
 550 int DecoderSession_finish_error(DecoderSession *d)
 551 {
 552 #ifdef FLAC__HAS_OGG
 553         if(d->is_ogg) {
 554                 if(d->decoder.ogg.file) {
 555                         OggFLAC__file_decoder_finish(d->decoder.ogg.file);
 556                         OggFLAC__file_decoder_delete(d->decoder.ogg.file);
 557                 }
 558         }
 559         else
 560 #endif
 561         {
 562                 if(d->decoder.flac.file) {
 563                         FLAC__file_decoder_finish(d->decoder.flac.file);
 564                         FLAC__file_decoder_delete(d->decoder.flac.file);
 565                 }
 566         }
 567         if(d->analysis_mode)
 568                 flac__analyze_finish(d->aopts);
 569         DecoderSession_destroy(d, /*error_occurred=*/true);
 570         return 1;
 571 }
 572
 573 FLAC__bool canonicalize_until_specification(utils__SkipUntilSpecification *spec, const char *inbasefilename, unsigned sample_rate, FLAC__uint64 skip, FLAC__uint64 total_samples_in_input)
 574 {
 575         /* convert from mm:ss.sss to sample number if necessary */
 576         flac__utils_canonicalize_skip_until_specification(spec, sample_rate);
 577
 578         /* special case: if "--until=-0", use the special value '0' to mean "end-of-stream" */
 579         if(spec->is_relative && spec->value.samples == 0) {
 580                 spec->is_relative = false;
 581                 return true;
 582         }
 583
 584         /* in any other case the total samples in the input must be known */
 585         if(total_samples_in_input == 0) {
 586                 fprintf(stderr, "%s: ERROR, cannot use --until when FLAC metadata has total sample count of 0\n", inbasefilename);
 587                 return false;
 588         }
 589
 590         FLAC__ASSERT(spec->value_is_samples);
 591
 592         /* convert relative specifications to absolute */
 593         if(spec->is_relative) {
 594                 if(spec->value.samples <= 0)
 595                         spec->value.samples += (FLAC__int64)total_samples_in_input;
 596                 else
 597                         spec->value.samples += skip;
 598                 spec->is_relative = false;
 599         }
 600
 601         /* error check */
 602         if(spec->value.samples < 0) {
 603                 fprintf(stderr, "%s: ERROR, --until value is before beginning of input\n", inbasefilename);
 604                 return false;
 605         }
 606         if((FLAC__uint64)spec->value.samples <= skip) {
 607                 fprintf(stderr, "%s: ERROR, --until value is before --skip point\n", inbasefilename);
 608                 return false;
 609         }
 610         if((FLAC__uint64)spec->value.samples > total_samples_in_input) {
 611                 fprintf(stderr, "%s: ERROR, --until value is after end of input\n", inbasefilename);
 612                 return false;
 613         }
 614
 615         return true;
 616 }
 617
 618 FLAC__bool write_necessary_headers(DecoderSession *decoder_session)
 619 {
 620         /* write the WAVE/AIFF headers if necessary */
 621         if(!decoder_session->analysis_mode && !decoder_session->test_only && (decoder_session->is_wave_out || decoder_session->is_aiff_out)) {
 622                 const char *fmt_desc = decoder_session->is_wave_out? "WAVE" : "AIFF";
 623                 FLAC__uint64 data_size = decoder_session->total_samples * decoder_session->channels * ((decoder_session->bps+7)/8);
 624                 if(decoder_session->total_samples == 0) {
 625                         if(decoder_session->fout == stdout) {
 626                                 fprintf(stderr, "%s: WARNING, don't have accurate sample count available for %s header.\n", decoder_session->inbasefilename, fmt_desc);
 627                                 fprintf(stderr, "             Generated %s file will have a data chunk size of 0.  Try\n", fmt_desc);
 628                                 fprintf(stderr, "             decoding directly to a file instead.\n");
 629                         }
 630                         else {
 631                                 decoder_session->wave_chunk_size_fixup.needs_fixup = true;
 632                         }
 633                 }
 634                 if(data_size >= 0xFFFFFFDC) {
 635                         fprintf(stderr, "%s: ERROR: stream is too big to fit in a single %s file chunk\n", decoder_session->inbasefilename, fmt_desc);
 636                         return false;
 637                 }
 638                 if(decoder_session->is_wave_out) {
 639                         if(flac__utils_fwrite("RIFF", 1, 4, decoder_session->fout) != 4)
 640                                 return false;
 641
 642                         if(decoder_session->wave_chunk_size_fixup.needs_fixup)
 643                                 decoder_session->wave_chunk_size_fixup.riff_offset = ftell(decoder_session->fout);
 644
 645                         if(!write_little_endian_uint32(decoder_session->fout, (FLAC__uint32)(data_size+36))) /* filesize-8 */
 646                                 return false;
 647
 648                         if(flac__utils_fwrite("WAVEfmt ", 1, 8, decoder_session->fout) != 8)
 649                                 return false;
 650
 651                         if(flac__utils_fwrite("\020\000\000\000", 1, 4, decoder_session->fout) != 4) /* chunk size = 16 */
 652                                 return false;
 653
 654                         if(flac__utils_fwrite("\001\000", 1, 2, decoder_session->fout) != 2) /* compression code == 1 */
 655                                 return false;
 656
 657                         if(!write_little_endian_uint16(decoder_session->fout, (FLAC__uint16)(decoder_session->channels)))
 658                                 return false;
 659
 660                         if(!write_little_endian_uint32(decoder_session->fout, decoder_session->sample_rate))
 661                                 return false;
 662
 663                         if(!write_little_endian_uint32(decoder_session->fout, decoder_session->sample_rate * decoder_session->channels * ((decoder_session->bps+7) / 8))) /* @@@ or is it (sample_rate*channels*bps) / 8 ??? */
 664                                 return false;
 665
 666                         if(!write_little_endian_uint16(decoder_session->fout, (FLAC__uint16)(decoder_session->channels * ((decoder_session->bps+7) / 8)))) /* block align */
 667                                 return false;
 668
 669                         if(!write_little_endian_uint16(decoder_session->fout, (FLAC__uint16)(decoder_session->bps))) /* bits per sample */
 670                                 return false;
 671
 672                         if(flac__utils_fwrite("data", 1, 4, decoder_session->fout) != 4)
 673                                 return false;
 674
 675                         if(decoder_session->wave_chunk_size_fixup.needs_fixup)
 676                                 decoder_session->wave_chunk_size_fixup.data_offset = ftell(decoder_session->fout);
 677
 678                         if(!write_little_endian_uint32(decoder_session->fout, (FLAC__uint32)data_size)) /* data size */
 679                                 return false;
 680                 }
 681                 else {
 682                         const FLAC__uint32 aligned_data_size = (FLAC__uint32)((data_size+1) & (~1U));
 683
 684                         if(flac__utils_fwrite("FORM", 1, 4, decoder_session->fout) != 4)
 685                                 return false;
 686
 687                         if(decoder_session->wave_chunk_size_fixup.needs_fixup)
 688                                 decoder_session->wave_chunk_size_fixup.riff_offset = ftell(decoder_session->fout);
 689
 690                         if(!write_big_endian_uint32(decoder_session->fout, (FLAC__uint32)(aligned_data_size+46))) /* filesize-8 */
 691                                 return false;
 692
 693                         if(flac__utils_fwrite("AIFFCOMM", 1, 8, decoder_session->fout) != 8)
 694                                 return false;
 695
 696                         if(flac__utils_fwrite("\000\000\000\022", 1, 4, decoder_session->fout) != 4) /* chunk size = 18 */
 697                                 return false;
 698
 699                         if(!write_big_endian_uint16(decoder_session->fout, (FLAC__uint16)(decoder_session->channels)))
 700                                 return false;
 701
 702                         if(decoder_session->wave_chunk_size_fixup.needs_fixup)
 703                                 decoder_session->wave_chunk_size_fixup.frames_offset = ftell(decoder_session->fout);
 704
 705                         if(!write_big_endian_uint32(decoder_session->fout, (FLAC__uint32)decoder_session->total_samples))
 706                                 return false;
 707
 708                         if(!write_big_endian_uint16(decoder_session->fout, (FLAC__uint16)(decoder_session->bps)))
 709                                 return false;
 710
 711                         if(!write_sane_extended(decoder_session->fout, decoder_session->sample_rate))
 712                                 return false;
 713
 714                         if(flac__utils_fwrite("SSND", 1, 4, decoder_session->fout) != 4)
 715                                 return false;
 716
 717                         if(decoder_session->wave_chunk_size_fixup.needs_fixup)
 718                                 decoder_session->wave_chunk_size_fixup.data_offset = ftell(decoder_session->fout);
 719
 720                         if(!write_big_endian_uint32(decoder_session->fout, (FLAC__uint32)data_size+8)) /* data size */
 721                                 return false;
 722
 723                         if(!write_big_endian_uint32(decoder_session->fout, 0/*offset*/))
 724                                 return false;
 725
 726                         if(!write_big_endian_uint32(decoder_session->fout, 0/*block_size*/))
 727                                 return false;
 728                 }
 729         }
 730
 731         return true;
 732 }
 733
 734 FLAC__bool write_little_endian_uint16(FILE *f, FLAC__uint16 val)
 735 {
 736         FLAC__byte *b = (FLAC__byte*)(&val);
 737         if(is_big_endian_host_) {
 738                 FLAC__byte tmp;
 739                 tmp = b[1]; b[1] = b[0]; b[0] = tmp;
 740         }
 741         return flac__utils_fwrite(b, 1, 2, f) == 2;
 742 }
 743
 744 FLAC__bool write_little_endian_uint32(FILE *f, FLAC__uint32 val)
 745 {
 746         FLAC__byte *b = (FLAC__byte*)(&val);
 747         if(is_big_endian_host_) {
 748                 FLAC__byte tmp;
 749                 tmp = b[3]; b[3] = b[0]; b[0] = tmp;
 750                 tmp = b[2]; b[2] = b[1]; b[1] = tmp;
 751         }
 752         return flac__utils_fwrite(b, 1, 4, f) == 4;
 753 }
 754
 755 FLAC__bool write_big_endian_uint16(FILE *f, FLAC__uint16 val)
 756 {
 757         FLAC__byte *b = (FLAC__byte*)(&val);
 758         if(!is_big_endian_host_) {
 759                 FLAC__byte tmp;
 760                 tmp = b[1]; b[1] = b[0]; b[0] = tmp;
 761         }
 762         return flac__utils_fwrite(b, 1, 2, f) == 2;
 763 }
 764
 765 FLAC__bool write_big_endian_uint32(FILE *f, FLAC__uint32 val)
 766 {
 767         FLAC__byte *b = (FLAC__byte*)(&val);
 768         if(!is_big_endian_host_) {
 769                 FLAC__byte tmp;
 770                 tmp = b[3]; b[3] = b[0]; b[0] = tmp;
 771                 tmp = b[2]; b[2] = b[1]; b[1] = tmp;
 772         }
 773         return flac__utils_fwrite(b, 1, 4, f) == 4;
 774 }
 775
 776 FLAC__bool write_sane_extended(FILE *f, unsigned val)
 777         /* Write to 'f' a SANE extended representation of 'val'.  Return false if
 778         * the write succeeds; return true otherwise.
 779         *
 780         * SANE extended is an 80-bit IEEE-754 representation with sign bit, 15 bits
 781         * of exponent, and 64 bits of significand (mantissa).  Unlike most IEEE-754
 782         * representations, it does not imply a 1 above the MSB of the significand.
 783         *
 784         * Preconditions:
 785         *  val!=0U
 786         */
 787 {
 788         unsigned int shift, exponent;
 789
 790         FLAC__ASSERT(val!=0U); /* handling 0 would require a special case */
 791
 792         for(shift= 0U; (val>>(31-shift))==0U; ++shift)
 793                 ;
 794         val<<= shift;
 795         exponent= 63U-(shift+32U); /* add 32 for unused second word */
 796
 797         if(!write_big_endian_uint16(f, (FLAC__uint16)(exponent+0x3FFF)))
 798                 return false;
 799         if(!write_big_endian_uint32(f, val))
 800                 return false;
 801         if(!write_big_endian_uint32(f, 0)) /* unused second word */
 802                 return false;
 803
 804         return true;
 805 }
 806
 807 FLAC__bool fixup_wave_chunk_size(const char *outfilename, FLAC__bool is_wave_out, unsigned riff_offset, unsigned data_offset, unsigned frames_offset, FLAC__uint32 total_samples, unsigned channels, unsigned bps)
 808 {
 809         const char *fmt_desc = (is_wave_out? "WAVE" : "AIFF");
 810         FLAC__bool (*write_it)(FILE *, FLAC__uint32) = (is_wave_out? write_little_endian_uint32 : write_big_endian_uint32);
 811         FILE *f = fopen(outfilename, "r+b");
 812         FLAC__uint32 data_size, aligned_data_size;
 813
 814         if(0 == f) {
 815                 fprintf(stderr, "ERROR, couldn't open file %s while fixing up %s chunk size\n", outfilename, fmt_desc);
 816                 return false;
 817         }
 818
 819         data_size = aligned_data_size = total_samples * channels * ((bps+7)/8);
 820         if(!is_wave_out && (aligned_data_size & 1))
 821                 aligned_data_size++;
 822
 823         if(fseek(f, riff_offset, SEEK_SET) < 0) {
 824                 fprintf(stderr, "ERROR, couldn't seek in file %s while fixing up %s chunk size\n", outfilename, fmt_desc);
 825                 fclose(f);
 826                 return false;
 827         }
 828         if(!write_it(f, aligned_data_size + (is_wave_out? 36 : 46))) {
 829                 fprintf(stderr, "ERROR, couldn't write size in file %s while fixing up %s chunk size\n", outfilename, fmt_desc);
 830                 fclose(f);
 831                 return false;
 832         }
 833         if(!is_wave_out) {
 834                 if(fseek(f, frames_offset, SEEK_SET) < 0) {
 835                         fprintf(stderr, "ERROR, couldn't seek in file %s while fixing up %s chunk size\n", outfilename, fmt_desc);
 836                         fclose(f);
 837                         return false;
 838                 }
 839                 if(!write_it(f, total_samples)) {
 840                         fprintf(stderr, "ERROR, couldn't write size in file %s while fixing up %s chunk size\n", outfilename, fmt_desc);
 841                         fclose(f);
 842                         return false;
 843                 }
 844         }
 845         if(fseek(f, data_offset, SEEK_SET) < 0) {
 846                 fprintf(stderr, "ERROR, couldn't seek in file %s while fixing up %s chunk size\n", outfilename, fmt_desc);
 847                 fclose(f);
 848                 return false;
 849         }
 850         if(!write_it(f, data_size + (is_wave_out? 0 : 8))) {
 851                 fprintf(stderr, "ERROR, couldn't write size in file %s while fixing up %s chunk size\n", outfilename, fmt_desc);
 852                 fclose(f);
 853                 return false;
 854         }
 855         fclose(f);
 856         return true;
 857 }
 858
 859 FLAC__StreamDecoderWriteStatus write_callback(const void *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
 860 {
 861         DecoderSession *decoder_session = (DecoderSession*)client_data;
 862         FILE *fout = decoder_session->fout;
 863         const unsigned bps = frame->header.bits_per_sample, channels = frame->header.channels;
 864         FLAC__bool is_big_endian = (decoder_session->is_aiff_out? true : (decoder_session->is_wave_out? false : decoder_session->is_big_endian));
 865         FLAC__bool is_unsigned_samples = (decoder_session->is_aiff_out? false : (decoder_session->is_wave_out? bps<=8 : decoder_session->is_unsigned_samples));
 866         unsigned wide_samples = frame->header.blocksize, wide_sample, sample, channel, byte;
 867         static FLAC__int8 s8buffer[FLAC__MAX_BLOCK_SIZE * FLAC__MAX_CHANNELS * sizeof(FLAC__int32)]; /* WATCHOUT: can be up to 2 megs */
 868         FLAC__uint8  *u8buffer  = (FLAC__uint8  *)s8buffer;
 869         FLAC__int16  *s16buffer = (FLAC__int16  *)s8buffer;
 870         FLAC__uint16 *u16buffer = (FLAC__uint16 *)s8buffer;
 871         FLAC__int32  *s32buffer = (FLAC__int32  *)s8buffer;
 872         FLAC__uint32 *u32buffer = (FLAC__uint32 *)s8buffer;
 873
 874         (void)decoder;
 875
 876         if(decoder_session->abort_flag)
 877                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 878
 879         if(bps != decoder_session->bps) {
 880                 fprintf(stderr, "%s: ERROR, bits-per-sample is %u in frame but %u in STREAMINFO\n", decoder_session->inbasefilename, bps, decoder_session->bps);
 881                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 882         }
 883         if(channels != decoder_session->channels) {
 884                 fprintf(stderr, "%s: ERROR, channels is %u in frame but %u in STREAMINFO\n", decoder_session->inbasefilename, channels, decoder_session->channels);
 885                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 886         }
 887         if(frame->header.sample_rate != decoder_session->sample_rate) {
 888                 fprintf(stderr, "%s: ERROR, sample rate is %u in frame but %u in STREAMINFO\n", decoder_session->inbasefilename, frame->header.sample_rate, decoder_session->sample_rate);
 889                 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 890         }
 891
 892         /*
 893          * limit the number of samples to accept based on --until
 894          */
 895         FLAC__ASSERT(!decoder_session->skip_specification->is_relative);
 896         FLAC__ASSERT(decoder_session->skip_specification->value.samples >= 0);
 897         FLAC__ASSERT(!decoder_session->until_specification->is_relative);
 898         FLAC__ASSERT(decoder_session->until_specification->value.samples >= 0);
 899         if(decoder_session->until_specification->value.samples > 0) {
 900                 const FLAC__uint64 skip = (FLAC__uint64)decoder_session->skip_specification->value.samples;
 901                 const FLAC__uint64 until = (FLAC__uint64)decoder_session->until_specification->value.samples;
 902                 const FLAC__uint64 input_samples_passed = skip + decoder_session->samples_processed;
 903                 FLAC__ASSERT(until >= input_samples_passed);
 904                 if(input_samples_passed + wide_samples > until)
 905                         wide_samples = (unsigned)(until - input_samples_passed);
 906                 if (wide_samples == 0) {
 907                         decoder_session->abort_flag = true;
 908                         decoder_session->aborting_due_to_until = true;
 909                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 910                 }
 911         }
 912
 913         if(wide_samples > 0) {
 914                 decoder_session->samples_processed += wide_samples;
 915                 decoder_session->frame_counter++;
 916
 917                 if(decoder_session->verbose && !(decoder_session->frame_counter & 0x3f))
 918                         print_stats(decoder_session);
 919
 920                 if(decoder_session->analysis_mode) {
 921                         flac__analyze_frame(frame, decoder_session->frame_counter-1, decoder_session->aopts, fout);
 922                 }
 923                 else if(!decoder_session->test_only) {
 924                         if (decoder_session->replaygain.apply) {
 925                                 const size_t n = FLAC__replaygain_synthesis__apply_gain(
 926                                         u8buffer,
 927                                         !is_big_endian,
 928                                         is_unsigned_samples,
 929                                         buffer,
 930                                         wide_samples,
 931                                         channels,
 932                                         bps, /* source_bps */
 933                                         bps, /* target_bps */
 934                                         decoder_session->replaygain.scale,
 935                                         decoder_session->replaygain.spec.limiter == RGSS_LIMIT__HARD, /* hard_limit */
 936                                         decoder_session->replaygain.spec.noise_shaping != NOISE_SHAPING_NONE, /* do_dithering */
 937                                         &decoder_session->replaygain.dither_context
 938                                 );
 939                                 if(flac__utils_fwrite(u8buffer, 1, n, fout) != n)
 940                                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 941                         }
 942                         else if(bps == 8) {
 943                                 if(is_unsigned_samples) {
 944                                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 945                                                 for(channel = 0; channel < channels; channel++, sample++)
 946                                                         u8buffer[sample] = (FLAC__uint8)(buffer[channel][wide_sample] + 0x80);
 947                                 }
 948                                 else {
 949                                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 950                                                 for(channel = 0; channel < channels; channel++, sample++)
 951                                                         s8buffer[sample] = (FLAC__int8)(buffer[channel][wide_sample]);
 952                                 }
 953                                 if(flac__utils_fwrite(u8buffer, 1, sample, fout) != sample)
 954                                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 955                         }
 956                         else if(bps == 16) {
 957                                 if(is_unsigned_samples) {
 958                                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 959                                                 for(channel = 0; channel < channels; channel++, sample++)
 960                                                         u16buffer[sample] = (FLAC__uint16)(buffer[channel][wide_sample] + 0x8000);
 961                                 }
 962                                 else {
 963                                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 964                                                 for(channel = 0; channel < channels; channel++, sample++)
 965                                                         s16buffer[sample] = (FLAC__int16)(buffer[channel][wide_sample]);
 966                                 }
 967                                 if(is_big_endian != is_big_endian_host_) {
 968                                         unsigned char tmp;
 969                                         const unsigned bytes = sample * 2;
 970                                         for(byte = 0; byte < bytes; byte += 2) {
 971                                                 tmp = u8buffer[byte];
 972                                                 u8buffer[byte] = u8buffer[byte+1];
 973                                                 u8buffer[byte+1] = tmp;
 974                                         }
 975                                 }
 976                                 if(flac__utils_fwrite(u16buffer, 2, sample, fout) != sample)
 977                                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
 978                         }
 979                         else if(bps == 24) {
 980                                 if(is_unsigned_samples) {
 981                                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 982                                                 for(channel = 0; channel < channels; channel++, sample++)
 983                                                         u32buffer[sample] = buffer[channel][wide_sample] + 0x800000;
 984                                 }
 985                                 else {
 986                                         for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 987                                                 for(channel = 0; channel < channels; channel++, sample++)
 988                                                         s32buffer[sample] = buffer[channel][wide_sample];
 989                                 }
 990                                 if(is_big_endian != is_big_endian_host_) {
 991                                         unsigned char tmp;
 992                                         const unsigned bytes = sample * 4;
 993                                         for(byte = 0; byte < bytes; byte += 4) {
 994                                                 tmp = u8buffer[byte];
 995                                                 u8buffer[byte] = u8buffer[byte+3];
 996                                                 u8buffer[byte+3] = tmp;
 997                                                 tmp = u8buffer[byte+1];
 998                                                 u8buffer[byte+1] = u8buffer[byte+2];
 999                                                 u8buffer[byte+2] = tmp;
1000                                         }
1001                                 }
1002                                 if(is_big_endian) {
1003                                         unsigned lbyte;
1004                                         const unsigned bytes = sample * 4;
1005                                         for(lbyte = byte = 0; byte < bytes; ) {
1006                                                 byte++;
1007                                                 u8buffer[lbyte++] = u8buffer[byte++];
1008                                                 u8buffer[lbyte++] = u8buffer[byte++];
1009                                                 u8buffer[lbyte++] = u8buffer[byte++];
1010                                         }
1011                                 }
1012                                 else {
1013                                         unsigned lbyte;
1014                                         const unsigned bytes = sample * 4;
1015                                         for(lbyte = byte = 0; byte < bytes; ) {
1016                                                 u8buffer[lbyte++] = u8buffer[byte++];
1017                                                 u8buffer[lbyte++] = u8buffer[byte++];
1018                                                 u8buffer[lbyte++] = u8buffer[byte++];
1019                                                 byte++;
1020                                         }
1021                                 }
1022                                 if(flac__utils_fwrite(u8buffer, 3, sample, fout) != sample)
1023                                         return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
1024                         }
1025                         else {
1026                                 FLAC__ASSERT(0);
1027                         }
1028                 }
1029         }
1030         return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
1031 }
1032
1033 void metadata_callback(const void *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
1034 {
1035         DecoderSession *decoder_session = (DecoderSession*)client_data;
1036         (void)decoder;
1037         if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
1038                 FLAC__uint64 skip, until;
1039                 decoder_session->bps = metadata->data.stream_info.bits_per_sample;
1040                 decoder_session->channels = metadata->data.stream_info.channels;
1041                 decoder_session->sample_rate = metadata->data.stream_info.sample_rate;
1042
1043                 flac__utils_canonicalize_skip_until_specification(decoder_session->skip_specification, decoder_session->sample_rate);
1044                 FLAC__ASSERT(decoder_session->skip_specification->value.samples >= 0);
1045                 skip = (FLAC__uint64)decoder_session->skip_specification->value.samples;
1046
1047                 /* remember, metadata->data.stream_info.total_samples can be 0, meaning 'unknown' */
1048                 if(metadata->data.stream_info.total_samples > 0 && skip >= metadata->data.stream_info.total_samples) {
1049                         fprintf(stderr, "%s: ERROR trying to --skip more samples than in stream\n", decoder_session->inbasefilename);
1050                         decoder_session->abort_flag = true;
1051                         return;
1052                 }
1053                 else if(metadata->data.stream_info.total_samples == 0 && skip > 0) {
1054                         fprintf(stderr, "%s: ERROR, can't --skip when FLAC metadata has total sample count of 0\n", decoder_session->inbasefilename);
1055                         decoder_session->abort_flag = true;
1056                         return;
1057                 }
1058                 FLAC__ASSERT(skip == 0 || 0 == decoder_session->cue_specification);
1059                 decoder_session->total_samples = metadata->data.stream_info.total_samples - skip;
1060
1061                 /* note that we use metadata->data.stream_info.total_samples instead of decoder_session->total_samples */
1062                 if(!canonicalize_until_specification(decoder_session->until_specification, decoder_session->inbasefilename, decoder_session->sample_rate, skip, metadata->data.stream_info.total_samples)) {
1063                         decoder_session->abort_flag = true;
1064                         return;
1065                 }
1066                 FLAC__ASSERT(decoder_session->until_specification->value.samples >= 0);
1067                 until = (FLAC__uint64)decoder_session->until_specification->value.samples;
1068
1069                 if(until > 0) {
1070                         FLAC__ASSERT(decoder_session->total_samples != 0);
1071                         FLAC__ASSERT(0 == decoder_session->cue_specification);
1072                         decoder_session->total_samples -= (metadata->data.stream_info.total_samples - until);
1073                 }
1074
1075                 if(decoder_session->bps != 8 && decoder_session->bps != 16 && decoder_session->bps != 24) {
1076                         fprintf(stderr, "%s: ERROR: bits per sample is not 8/16/24\n", decoder_session->inbasefilename);
1077                         decoder_session->abort_flag = true;
1078                         return;
1079                 }
1080         }
1081         else if(metadata->type == FLAC__METADATA_TYPE_CUESHEET) {
1082                 /* remember, at this point, decoder_session->total_samples can be 0, meaning 'unknown' */
1083                 if(decoder_session->total_samples == 0) {
1084                         fprintf(stderr, "%s: ERROR can't use --cue when FLAC metadata has total sample count of 0\n", decoder_session->inbasefilename);
1085                         decoder_session->abort_flag = true;
1086                         return;
1087                 }
1088
1089                 flac__utils_canonicalize_cue_specification(decoder_session->cue_specification, &metadata->data.cue_sheet, decoder_session->total_samples, decoder_session->skip_specification, decoder_session->until_specification);
1090
1091                 FLAC__ASSERT(!decoder_session->skip_specification->is_relative);
1092                 FLAC__ASSERT(decoder_session->skip_specification->value_is_samples);
1093
1094                 FLAC__ASSERT(!decoder_session->until_specification->is_relative);
1095                 FLAC__ASSERT(decoder_session->until_specification->value_is_samples);
1096
1097                 FLAC__ASSERT(decoder_session->skip_specification->value.samples >= 0);
1098                 FLAC__ASSERT(decoder_session->until_specification->value.samples >= 0);
1099                 FLAC__ASSERT((FLAC__uint64)decoder_session->until_specification->value.samples <= decoder_session->total_samples);
1100                 FLAC__ASSERT(decoder_session->skip_specification->value.samples <= decoder_session->until_specification->value.samples);
1101
1102                 decoder_session->total_samples = decoder_session->until_specification->value.samples - decoder_session->skip_specification->value.samples;
1103         }
1104         else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
1105                 if (decoder_session->replaygain.spec.apply) {
1106                         double gain, peak;
1107                         if (!(decoder_session->replaygain.apply = grabbag__replaygain_load_from_vorbiscomment(metadata, decoder_session->replaygain.spec.use_album_gain, &gain, &peak))) {
1108                                 fprintf(stderr, "%s: WARNING: can't get %s ReplayGain tag\n", decoder_session->inbasefilename, decoder_session->replaygain.spec.use_album_gain? "album":"track");
1109                         }
1110                         else {
1111                                 const char *ls[] = { "no", "peak", "hard" };
1112                                 const char *ns[] = { "no", "low", "medium", "high" };
1113                                 decoder_session->replaygain.scale = grabbag__replaygain_compute_scale_factor(peak, gain, decoder_session->replaygain.spec.preamp, decoder_session->replaygain.spec.limiter == RGSS_LIMIT__PEAK);
1114                                 FLAC__ASSERT(decoder_session->bps > 0 && decoder_session->bps <= 32);
1115                                 FLAC__replaygain_synthesis__init_dither_context(&decoder_session->replaygain.dither_context, decoder_session->bps, decoder_session->replaygain.spec.noise_shaping);
1116                                 fprintf(stderr, "%s: INFO: applying %s ReplayGain (gain=%0.2fdB+preamp=%0.1fdB, %s noise shaping, %s limiting) to output\n", decoder_session->inbasefilename, decoder_session->replaygain.spec.use_album_gain? "album":"track", gain, decoder_session->replaygain.spec.preamp, ns[decoder_session->replaygain.spec.noise_shaping], ls[decoder_session->replaygain.spec.limiter]);
1117                                 fprintf(stderr, "%s: WARNING: applying ReplayGain is not lossless\n", decoder_session->inbasefilename);
1118                         }
1119                 }
1120         }
1121 }
1122
1123 void error_callback(const void *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
1124 {
1125         DecoderSession *decoder_session = (DecoderSession*)client_data;
1126         (void)decoder;
1127         fprintf(stderr, "%s: *** Got error code %d:%s\n", decoder_session->inbasefilename, status, FLAC__StreamDecoderErrorStatusString[status]);
1128         if(!decoder_session->continue_through_decode_errors)
1129                 decoder_session->abort_flag = true;
1130 }
1131
1132 void print_error_with_state(const DecoderSession *d, const char *message)
1133 {
1134         const int ilen = strlen(d->inbasefilename) + 1;
1135
1136         fprintf(stderr, "\n%s: %s\n", d->inbasefilename, message);
1137
1138 #ifdef FLAC__HAS_OGG
1139         if(d->is_ogg) {
1140                 const OggFLAC__FileDecoderState ofd_state = OggFLAC__file_decoder_get_state(d->decoder.ogg.file);
1141                 if(ofd_state != OggFLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR) {
1142                         fprintf(stderr, "%*s state = %d:%s\n", ilen, "", (int)ofd_state, OggFLAC__FileDecoderStateString[ofd_state]);
1143                 }
1144                 else {
1145                         const OggFLAC__SeekableStreamDecoderState ossd_state = OggFLAC__file_decoder_get_seekable_stream_decoder_state(d->decoder.ogg.file);
1146                         if(ossd_state != OggFLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR) {
1147                                 fprintf(stderr, "%*s state = %d:%s\n", ilen, "", (int)ossd_state, OggFLAC__SeekableStreamDecoderStateString[ossd_state]);
1148                         }
1149                         else {
1150                                 const OggFLAC__StreamDecoderState osd_state = OggFLAC__file_decoder_get_state(d->decoder.ogg.file);
1151                                 if(osd_state != OggFLAC__STREAM_DECODER_FLAC_STREAM_DECODER_ERROR) {
1152                                         fprintf(stderr, "%*s state = %d:%s\n", ilen, "", (int)osd_state, OggFLAC__StreamDecoderStateString[osd_state]);
1153                                 }
1154                                 else {
1155                                         const FLAC__StreamDecoderState fsd_state = OggFLAC__file_decoder_get_FLAC_stream_decoder_state(d->decoder.ogg.file);
1156                                         fprintf(stderr, "%*s state = %d:%s\n", ilen, "", (int)fsd_state, FLAC__StreamDecoderStateString[fsd_state]);
1157                                 }
1158                         }
1159                 }
1160         }
1161         else
1162 #endif
1163         {
1164                 const FLAC__FileDecoderState ffd_state = FLAC__file_decoder_get_state(d->decoder.flac.file);
1165                 if(ffd_state != FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR) {
1166                         fprintf(stderr, "%*s state = %d:%s\n", ilen, "", (int)ffd_state, FLAC__FileDecoderStateString[ffd_state]);
1167                 }
1168                 else {
1169                         const FLAC__SeekableStreamDecoderState fssd_state = FLAC__file_decoder_get_seekable_stream_decoder_state(d->decoder.flac.file);
1170                         if(fssd_state != FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR) {
1171                                 fprintf(stderr, "%*s state = %d:%s\n", ilen, "", (int)fssd_state, FLAC__SeekableStreamDecoderStateString[fssd_state]);
1172                         }
1173                         else {
1174                                 const FLAC__StreamDecoderState fsd_state = FLAC__file_decoder_get_stream_decoder_state(d->decoder.flac.file);
1175                                 fprintf(stderr, "%*s state = %d:%s\n", ilen, "", (int)fsd_state, FLAC__StreamDecoderStateString[fsd_state]);
1176                         }
1177                 }
1178         }
1179 }
1180
1181 void print_stats(const DecoderSession *decoder_session)
1182 {
1183         if(decoder_session->verbose) {
1184 #if defined _MSC_VER || defined __MINGW32__
1185                 /* with VC++ you have to spoon feed it the casting */
1186                 const double progress = (double)(FLAC__int64)decoder_session->samples_processed / (double)(FLAC__int64)decoder_session->total_samples * 100.0;
1187 #else
1188                 const double progress = (double)decoder_session->samples_processed / (double)decoder_session->total_samples * 100.0;
1189 #endif
1190                 if(decoder_session->total_samples > 0) {
1191                         fprintf(stderr, "\r%s: %s%u%% complete",
1192                                 decoder_session->inbasefilename,
1193                                 decoder_session->test_only? "testing, " : decoder_session->analysis_mode? "analyzing, " : "",
1194                                 (unsigned)floor(progress + 0.5)
1195                         );
1196                 }
1197                 else {
1198                         fprintf(stderr, "\r%s: %s %u samples",
1199                                 decoder_session->inbasefilename,
1200                                 decoder_session->test_only? "tested" : decoder_session->analysis_mode? "analyzed" : "wrote",
1201                                 (unsigned)decoder_session->samples_processed
1202                         );
1203                 }
1204         }
1205 }