src/flac/decode.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 <assert.h> /* for FILE */
  26 #include <stdio.h> /* for FILE */
  27 #include <string.h> /* for strcmp() */
  28 #include "FLAC/all.h"
  29 #include "decode.h"
  30
  31 typedef struct {
  32         FILE *fout;
  33         bool abort_flag;
  34         bool analysis_mode;
  35         bool test_only;
  36         bool is_wave_out;
  37         bool is_big_endian;
  38         bool is_unsigned_samples;
  39         uint64 total_samples;
  40         unsigned bps;
  41         unsigned channels;
  42         unsigned sample_rate;
  43         bool verbose;
  44         uint64 skip;
  45         uint64 samples_processed;
  46         unsigned frame_counter;
  47 } stream_info_struct;
  48
  49 static FLAC__FileDecoder *decoder;
  50 static bool is_big_endian_host;
  51
  52 /* local routines */
  53 static bool init(const char *infile, stream_info_struct *stream_info);
  54 static bool write_little_endian_uint16(FILE *f, uint16 val);
  55 static bool write_little_endian_uint32(FILE *f, uint32 val);
  56 static FLAC__StreamDecoderWriteStatus write_callback(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data);
  57 static void metadata_callback(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data);
  58 static void error_callback(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
  59 static void print_stats(const stream_info_struct *stream_info);
  60
  61 int decode_wav(const char *infile, const char *outfile, bool analysis_mode, bool verbose, uint64 skip)
  62 {
  63         bool md5_failure = false;
  64         stream_info_struct stream_info;
  65
  66         decoder = 0;
  67         stream_info.abort_flag = false;
  68         stream_info.analysis_mode = analysis_mode;
  69         stream_info.test_only = (outfile == 0);
  70         stream_info.is_wave_out = true;
  71         stream_info.verbose = verbose;
  72         stream_info.skip = skip;
  73         stream_info.samples_processed = 0;
  74         stream_info.frame_counter = 0;
  75
  76         assert(!(stream_info.test_only && stream_info.analysis_mode));
  77
  78         if(!stream_info.test_only) {
  79                 if(0 == strcmp(outfile, "-")) {
  80                         stream_info.fout = stdout;
  81                 }
  82                 else {
  83                         if(0 == (stream_info.fout = fopen(outfile, "wb"))) {
  84                                 fprintf(stderr, "ERROR: can't open output file %s\n", outfile);
  85                                 return false;
  86                         }
  87                 }
  88         }
  89
  90         if(!init(infile, &stream_info))
  91                 goto wav_abort_;
  92
  93         if(skip > 0) {
  94                 if(!FLAC__file_decoder_process_metadata(decoder)) {
  95                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
  96                         goto wav_abort_;
  97                 }
  98                 if(!FLAC__file_decoder_seek_absolute(decoder, skip)) {
  99                         fprintf(stderr, "%s: ERROR seeking while skipping bytes\n", infile);
 100                         goto wav_abort_;
 101                 }
 102                 if(!FLAC__file_decoder_process_remaining_frames(decoder)) {
 103                         if(verbose) { printf("\n"); fflush(stdout); }
 104                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 105                         goto wav_abort_;
 106                 }
 107                 if(decoder->state != FLAC__FILE_DECODER_OK && decoder->state != FLAC__FILE_DECODER_END_OF_FILE) {
 108                         if(verbose) { printf("\n"); fflush(stdout); }
 109                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 110                         goto wav_abort_;
 111                 }
 112         }
 113         else {
 114                 if(!FLAC__file_decoder_process_whole_file(decoder)) {
 115                         if(verbose) { printf("\n"); fflush(stdout); }
 116                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 117                         goto wav_abort_;
 118                 }
 119                 if(decoder->state != FLAC__FILE_DECODER_OK && decoder->state != FLAC__FILE_DECODER_END_OF_FILE) {
 120                         if(verbose) { printf("\n"); fflush(stdout); }
 121                         fprintf(stderr, "%s: ERROR during decoding, state=%d:%s\n", infile, decoder->state, FLAC__FileDecoderStateString[decoder->state]);
 122                         goto wav_abort_;
 123                 }
 124         }
 125
 126         if(decoder) {
 127                 if(decoder->state != FLAC__FILE_DECODER_UNINITIALIZED)
 128                         md5_failure = !FLAC__file_decoder_finish(decoder);
 129                 print_stats(&stream_info);
 130                 FLAC__file_decoder_free_instance(decoder);
 131         }
 132         if(!stream_info.test_only)
 133                 fclose(stream_info.fout);
 134         if(verbose)
 135                 printf("\n");
 136         fflush(stdout);
 137         if(md5_failure) {
 138                 fprintf(stderr, "%s: WARNING, MD5 signature mismatch\n", infile);
 139                 return 1;
 140         }
 141         else {
 142                 if(stream_info.test_only)
 143                         printf("%s: ok\n", infile);
 144         }
 145         return 0;
 146 wav_abort_:
 147         if(decoder) {
 148                 if(decoder->state != FLAC__FILE_DECODER_UNINITIALIZED)
 149                         FLAC__file_decoder_finish(decoder);
 150                 FLAC__file_decoder_free_instance(decoder);
 151         }
 152         if(!stream_info.test_only) {
 153                 fclose(stream_info.fout);
 154                 unlink(outfile);
 155         }
 156         return 1;
 157 }
 158
 159 int decode_raw(const char *infile, const char *outfile, bool analysis_mode, bool verbose, uint64 skip, bool is_big_endian, bool is_unsigned_samples)
 160 {
 161         bool md5_failure = false;
 162         stream_info_struct stream_info;
 163
 164         decoder = 0;
 165         stream_info.abort_flag = false;
 166         stream_info.analysis_mode = analysis_mode;
 167         stream_info.test_only = (outfile == 0);
 168         stream_info.is_wave_out = false;
 169         stream_info.is_big_endian = is_big_endian;
 170         stream_info.is_unsigned_samples = is_unsigned_samples;
 171         stream_info.verbose = verbose;
 172         stream_info.skip = skip;
 173         stream_info.samples_processed = 0;
 174         stream_info.frame_counter = 0;
 175
 176         assert(!(stream_info.test_only && stream_info.analysis_mode));
 177
 178         if(!stream_info.test_only) {
 179                 if(0 == strcmp(outfile, "-")) {
 180                         stream_info.fout = stdout;
 181                 }
 182                 else {
 183                         if(0 == (stream_info.fout = fopen(outfile, "wb"))) {
 184                                 fprintf(stderr, "ERROR: can't open output file %s\n", outfile);
 185                                 return false;
 186                         }
 187                 }
 188         }
 189
 190         if(!init(infile, &stream_info))
 191                 goto raw_abort_;
 192
 193         if(skip > 0) {
 194                 if(!FLAC__file_decoder_process_metadata(decoder)) {
 195                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 196                         goto raw_abort_;
 197                 }
 198                 if(!FLAC__file_decoder_seek_absolute(decoder, skip)) {
 199                         fprintf(stderr, "%s: ERROR seeking while skipping bytes\n", infile);
 200                         goto raw_abort_;
 201                 }
 202                 if(!FLAC__file_decoder_process_remaining_frames(decoder)) {
 203                         if(verbose) { printf("\n"); fflush(stdout); }
 204                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 205                         goto raw_abort_;
 206                 }
 207                 if(decoder->state != FLAC__FILE_DECODER_OK && decoder->state != FLAC__FILE_DECODER_END_OF_FILE) {
 208                         if(verbose) { printf("\n"); fflush(stdout); }
 209                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 210                         goto raw_abort_;
 211                 }
 212         }
 213         else {
 214                 if(!FLAC__file_decoder_process_whole_file(decoder)) {
 215                         if(verbose) { printf("\n"); fflush(stdout); }
 216                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 217                         goto raw_abort_;
 218                 }
 219                 if(decoder->state != FLAC__FILE_DECODER_OK && decoder->state != FLAC__FILE_DECODER_END_OF_FILE) {
 220                         if(verbose) { printf("\n"); fflush(stdout); }
 221                         fprintf(stderr, "%s: ERROR during decoding\n", infile);
 222                         goto raw_abort_;
 223                 }
 224         }
 225
 226         if(decoder) {
 227                 if(decoder->state != FLAC__FILE_DECODER_UNINITIALIZED)
 228                         md5_failure = !FLAC__file_decoder_finish(decoder);
 229                 print_stats(&stream_info);
 230                 FLAC__file_decoder_free_instance(decoder);
 231         }
 232         if(!stream_info.test_only)
 233                 fclose(stream_info.fout);
 234         if(verbose)
 235                 printf("\n");
 236         fflush(stdout);
 237         if(md5_failure) {
 238                 fprintf(stderr, "%s: WARNING, MD5 signature mismatch\n", infile);
 239                 return 1;
 240         }
 241         else {
 242                 if(stream_info.test_only)
 243                         printf("%s: ok\n", infile);
 244         }
 245         return 0;
 246 raw_abort_:
 247         if(decoder) {
 248                 if(decoder->state != FLAC__FILE_DECODER_UNINITIALIZED)
 249                         FLAC__file_decoder_finish(decoder);
 250                 FLAC__file_decoder_free_instance(decoder);
 251         }
 252         if(!stream_info.test_only) {
 253                 fclose(stream_info.fout);
 254                 unlink(outfile);
 255         }
 256         return 1;
 257 }
 258
 259 bool init(const char *infile, stream_info_struct *stream_info)
 260 {
 261         uint32 test = 1;
 262
 263         is_big_endian_host = (*((byte*)(&test)))? false : true;
 264
 265         decoder = FLAC__file_decoder_get_new_instance();
 266         if(0 == decoder) {
 267                 fprintf(stderr, "ERROR creating the decoder instance\n");
 268                 return false;
 269         }
 270         decoder->check_md5 = true;
 271
 272         if(FLAC__file_decoder_init(decoder, infile, write_callback, metadata_callback, error_callback, stream_info) != FLAC__FILE_DECODER_OK) {
 273                 fprintf(stderr, "ERROR initializing decoder, state = %d\n", decoder->state);
 274                 return false;
 275         }
 276
 277         return true;
 278 }
 279
 280 bool write_little_endian_uint16(FILE *f, uint16 val)
 281 {
 282         byte *b = (byte*)(&val);
 283         if(is_big_endian_host) {
 284                 byte tmp;
 285                 tmp = b[1]; b[1] = b[0]; b[0] = tmp;
 286         }
 287         return fwrite(b, 1, 2, f) == 2;
 288 }
 289
 290 bool write_little_endian_uint32(FILE *f, uint32 val)
 291 {
 292         byte *b = (byte*)(&val);
 293         if(is_big_endian_host) {
 294                 byte tmp;
 295                 tmp = b[3]; b[3] = b[0]; b[0] = tmp;
 296                 tmp = b[2]; b[2] = b[1]; b[1] = tmp;
 297         }
 298         return fwrite(b, 1, 4, f) == 4;
 299 }
 300
 301 FLAC__StreamDecoderWriteStatus write_callback(const FLAC__FileDecoder *decoder, const FLAC__Frame *frame, const int32 *buffer[], void *client_data)
 302 {
 303         stream_info_struct *stream_info = (stream_info_struct *)client_data;
 304         FILE *fout = stream_info->fout;
 305         unsigned bps = stream_info->bps, channels = stream_info->channels;
 306         bool is_big_endian = (stream_info->is_wave_out? false : stream_info->is_big_endian);
 307         bool is_unsigned_samples = (stream_info->is_wave_out? bps==8 : stream_info->is_unsigned_samples);
 308         unsigned wide_samples = frame->header.blocksize, wide_sample, sample, channel, byte;
 309         static signed char scbuffer[FLAC__MAX_BLOCK_SIZE * FLAC__MAX_CHANNELS * ((FLAC__MAX_BITS_PER_SAMPLE+7)>>3)]; /* WATCHOUT: can be up to 2 megs */
 310         unsigned char *ucbuffer = (unsigned char *)scbuffer;
 311         signed short *ssbuffer = (signed short *)scbuffer;
 312         unsigned short *usbuffer = (unsigned short *)scbuffer;
 313
 314         (void)decoder;
 315
 316         if(stream_info->abort_flag)
 317                 return FLAC__STREAM_DECODER_WRITE_ABORT;
 318
 319         stream_info->samples_processed += wide_samples;
 320         stream_info->frame_counter++;
 321
 322         if(stream_info->verbose && !(stream_info->frame_counter & 0x1f))
 323                 print_stats(stream_info);
 324
 325         if(stream_info->analysis_mode) {
 326                 fprintf(fout, "frame=%u\tblocksize=%u\tsample_rate=%u\tchannels=%u\tchannel_assignment=%s\n", stream_info->frame_counter-1, frame->header.blocksize, frame->header.sample_rate, frame->header.channels, FLAC__ChannelAssignmentString[frame->header.channel_assignment]);
 327                 for(channel = 0; channel < channels; channel++) {
 328                         const FLAC__Subframe *subframe = frame->subframes+channel;
 329                         fprintf(fout, "\tsubframe=%u\ttype=%s", channel, FLAC__SubframeTypeString[subframe->type]);
 330                         switch(subframe->type) {
 331                                 case FLAC__SUBFRAME_TYPE_CONSTANT:
 332                                         fprintf(fout, "\tvalue=%d\n", subframe->data.constant.value);
 333                                         break;
 334                                 case FLAC__SUBFRAME_TYPE_FIXED:
 335                                         fprintf(fout, "\torder=%u\tpartition_order=%u\n", subframe->data.fixed.order, subframe->data.fixed.entropy_coding_method.data.partitioned_rice.order); /*@@@ assumes method is partitioned-rice */
 336                                         break;
 337                                 case FLAC__SUBFRAME_TYPE_LPC:
 338                                         fprintf(fout, "\torder=%u\tpartition_order=%u\tqlp_coeff_precision=%u\tquantization_level=%d\n", subframe->data.lpc.order, subframe->data.lpc.entropy_coding_method.data.partitioned_rice.order, subframe->data.lpc.qlp_coeff_precision, subframe->data.lpc.quantization_level); /*@@@ assumes method is partitioned-rice */
 339                                         break;
 340                                 case FLAC__SUBFRAME_TYPE_VERBATIM:
 341                                         fprintf(fout, "\n");
 342                                         break;
 343                         }
 344                 }
 345         }
 346         else if(!stream_info->test_only) {
 347                 if(bps == 8) {
 348                         if(is_unsigned_samples) {
 349                                 for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 350                                         for(channel = 0; channel < channels; channel++, sample++)
 351                                                 ucbuffer[sample] = buffer[channel][wide_sample] + 128;
 352                         }
 353                         else {
 354                                 for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 355                                         for(channel = 0; channel < channels; channel++, sample++)
 356                                                 scbuffer[sample] = buffer[channel][wide_sample];
 357                         }
 358                         if(fwrite(ucbuffer, 1, sample, fout) != sample)
 359                                 return FLAC__STREAM_DECODER_WRITE_ABORT;
 360                 }
 361                 else { /* bps == 16 */
 362                         if(is_unsigned_samples) {
 363                                 for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 364                                         for(channel = 0; channel < channels; channel++, sample++)
 365                                                 usbuffer[sample] = buffer[channel][wide_sample] + 32768;
 366                         }
 367                         else {
 368                                 for(sample = wide_sample = 0; wide_sample < wide_samples; wide_sample++)
 369                                         for(channel = 0; channel < channels; channel++, sample++)
 370                                                 ssbuffer[sample] = buffer[channel][wide_sample];
 371                         }
 372                         if(is_big_endian != is_big_endian_host) {
 373                                 unsigned char tmp;
 374                                 for(byte = 0; byte < sample<<1; byte += 2) {
 375                                         tmp = ucbuffer[byte];
 376                                         ucbuffer[byte] = ucbuffer[byte+1];
 377                                         ucbuffer[byte+1] = tmp;
 378                                 }
 379                         }
 380                         if(fwrite(usbuffer, 2, sample, fout) != sample)
 381                                 return FLAC__STREAM_DECODER_WRITE_ABORT;
 382                 }
 383         }
 384         return FLAC__STREAM_DECODER_WRITE_CONTINUE;
 385 }
 386
 387 void metadata_callback(const FLAC__FileDecoder *decoder, const FLAC__StreamMetaData *metadata, void *client_data)
 388 {
 389         stream_info_struct *stream_info = (stream_info_struct *)client_data;
 390         (void)decoder;
 391         if(metadata->type == FLAC__METADATA_TYPE_ENCODING) {
 392                 stream_info->total_samples = metadata->data.encoding.total_samples - stream_info->skip;
 393                 stream_info->bps = metadata->data.encoding.bits_per_sample;
 394                 stream_info->channels = metadata->data.encoding.channels;
 395                 stream_info->sample_rate = metadata->data.encoding.sample_rate;
 396
 397                 if(stream_info->bps != 8 && stream_info->bps != 16) {
 398                         fprintf(stderr, "ERROR: bits per sample is not 8 or 16\n");
 399                         stream_info->abort_flag = true;
 400                         return;
 401                 }
 402
 403                 /* write the WAVE headers if necessary */
 404                 if(!stream_info->analysis_mode && !stream_info->test_only && stream_info->is_wave_out) {
 405                         uint64 data_size = stream_info->total_samples * stream_info->channels * ((stream_info->bps+7)/8);
 406                         if(data_size >= 0xFFFFFFDC) {
 407                                 fprintf(stderr, "ERROR: stream is too big for a wave file\n");
 408                                 stream_info->abort_flag = true;
 409                                 return;
 410                         }
 411                         if(fwrite("RIFF", 1, 4, stream_info->fout) != 4) stream_info->abort_flag = true;
 412                         if(!write_little_endian_uint32(stream_info->fout, (uint32)(data_size+36))) stream_info->abort_flag = true; /* filesize-8 */
 413                         if(fwrite("WAVEfmt ", 1, 8, stream_info->fout) != 8) stream_info->abort_flag = true;
 414                         if(fwrite("\020\000\000\000", 1, 4, stream_info->fout) != 4) stream_info->abort_flag = true; /* chunk size = 16 */
 415                         if(fwrite("\001\000", 1, 2, stream_info->fout) != 2) stream_info->abort_flag = true; /* compression code == 1 */
 416                         if(!write_little_endian_uint16(stream_info->fout, (uint16)(stream_info->channels))) stream_info->abort_flag = true;
 417                         if(!write_little_endian_uint32(stream_info->fout, stream_info->sample_rate)) stream_info->abort_flag = true;
 418                         if(!write_little_endian_uint32(stream_info->fout, stream_info->sample_rate * stream_info->channels * ((stream_info->bps+7) / 8))) stream_info->abort_flag = true; /* @@@ or is it (sample_rate*channels*bps) / 8 ??? */
 419                         if(!write_little_endian_uint16(stream_info->fout, (uint16)(stream_info->channels * ((stream_info->bps+7) / 8)))) stream_info->abort_flag = true; /* block align */
 420                         if(!write_little_endian_uint16(stream_info->fout, (uint16)(stream_info->bps))) stream_info->abort_flag = true; /* bits per sample */
 421                         if(fwrite("data", 1, 4, stream_info->fout) != 4) stream_info->abort_flag = true;
 422                         if(!write_little_endian_uint32(stream_info->fout, (uint32)data_size)) stream_info->abort_flag = true; /* data size */
 423                 }
 424         }
 425 }
 426
 427 void error_callback(const FLAC__FileDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
 428 {
 429         stream_info_struct *stream_info = (stream_info_struct *)client_data;
 430         (void)decoder;
 431         fprintf(stderr, "*** Got error code %d\n", status);
 432         stream_info->abort_flag = true;
 433 }
 434
 435 void print_stats(const stream_info_struct *stream_info)
 436 {
 437         if(stream_info->verbose) {
 438                 printf("\r%s %u of %u samples, %6.2f%% complete",
 439                         stream_info->test_only? "tested" : stream_info->analysis_mode? "analyzed" : "wrote",
 440                         (unsigned)stream_info->samples_processed,
 441                         (unsigned)stream_info->total_samples,
 442 #ifdef _MSC_VER
 443                         /* with VC++ you have to spoon feed it the casting */
 444                         (double)(int64)stream_info->samples_processed / (double)(int64)stream_info->total_samples * 100.0
 445 #else
 446                         (double)stream_info->samples_processed / (double)stream_info->total_samples * 100.0
 447 #endif
 448                 );
 449                 fflush(stdout);
 450         }
 451 }