| 1 | /* grabbag - Convenience lib for various routines common to several tools |
| 2 | * Copyright (C) 2002-2009 Josh Coalson |
| 3 | * Copyright (C) 2011-2016 Xiph.Org Foundation |
| 4 | * |
| 5 | * This library is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU Lesser General Public |
| 7 | * License as published by the Free Software Foundation; either |
| 8 | * version 2.1 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * This library is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * Lesser General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU Lesser General Public |
| 16 | * License along with this library; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | #ifdef HAVE_CONFIG_H |
| 21 | # include <config.h> |
| 22 | #endif |
| 23 | |
| 24 | #include <locale.h> |
| 25 | #include <math.h> |
| 26 | #include <stdio.h> |
| 27 | #include <stdlib.h> |
| 28 | #include <string.h> |
| 29 | #if defined _MSC_VER || defined __MINGW32__ |
| 30 | #include <io.h> /* for chmod() */ |
| 31 | #endif |
| 32 | #include <sys/stat.h> /* for stat(), maybe chmod() */ |
| 33 | |
| 34 | #include "FLAC/assert.h" |
| 35 | #include "FLAC/metadata.h" |
| 36 | #include "FLAC/stream_decoder.h" |
| 37 | #include "share/grabbag.h" |
| 38 | #include "share/replaygain_analysis.h" |
| 39 | #include "share/safe_str.h" |
| 40 | |
| 41 | #ifdef local_min |
| 42 | #undef local_min |
| 43 | #endif |
| 44 | #define local_min(a,b) ((a)<(b)?(a):(b)) |
| 45 | |
| 46 | #ifdef local_max |
| 47 | #undef local_max |
| 48 | #endif |
| 49 | #define local_max(a,b) ((a)>(b)?(a):(b)) |
| 50 | |
| 51 | static const char *reference_format_ = "%s=%2.1f dB"; |
| 52 | static const char *gain_format_ = "%s=%+2.2f dB"; |
| 53 | static const char *peak_format_ = "%s=%1.8f"; |
| 54 | |
| 55 | static double album_peak_, title_peak_; |
| 56 | |
| 57 | const unsigned GRABBAG__REPLAYGAIN_MAX_TAG_SPACE_REQUIRED = 190; |
| 58 | /* |
| 59 | FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 29 + 1 + 8 + |
| 60 | FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 + |
| 61 | FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12 + |
| 62 | FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 + |
| 63 | FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12 |
| 64 | */ |
| 65 | |
| 66 | const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS = (const FLAC__byte * const)"REPLAYGAIN_REFERENCE_LOUDNESS"; |
| 67 | const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN = (const FLAC__byte * const)"REPLAYGAIN_TRACK_GAIN"; |
| 68 | const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK = (const FLAC__byte * const)"REPLAYGAIN_TRACK_PEAK"; |
| 69 | const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_GAIN"; |
| 70 | const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_PEAK"; |
| 71 | |
| 72 | |
| 73 | static FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats) |
| 74 | { |
| 75 | FLAC__ASSERT(0 != filename); |
| 76 | FLAC__ASSERT(0 != stats); |
| 77 | return (0 == flac_stat(filename, stats)); |
| 78 | } |
| 79 | |
| 80 | static void set_file_stats_(const char *filename, struct flac_stat_s *stats) |
| 81 | { |
| 82 | FLAC__ASSERT(0 != filename); |
| 83 | FLAC__ASSERT(0 != stats); |
| 84 | |
| 85 | (void)flac_chmod(filename, stats->st_mode); |
| 86 | } |
| 87 | |
| 88 | static FLAC__bool append_tag_(FLAC__StreamMetadata *block, const char *format, const FLAC__byte *name, float value) |
| 89 | { |
| 90 | char buffer[256]; |
| 91 | char *saved_locale; |
| 92 | FLAC__StreamMetadata_VorbisComment_Entry entry; |
| 93 | |
| 94 | FLAC__ASSERT(0 != block); |
| 95 | FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); |
| 96 | FLAC__ASSERT(0 != format); |
| 97 | FLAC__ASSERT(0 != name); |
| 98 | |
| 99 | buffer[sizeof(buffer)-1] = '\0'; |
| 100 | /* |
| 101 | * We need to save the old locale and switch to "C" because the locale |
| 102 | * influences the formatting of %f and we want it a certain way. |
| 103 | */ |
| 104 | saved_locale = strdup(setlocale(LC_ALL, 0)); |
| 105 | if (0 == saved_locale) |
| 106 | return false; |
| 107 | setlocale(LC_ALL, "C"); |
| 108 | flac_snprintf(buffer, sizeof(buffer), format, name, value); |
| 109 | setlocale(LC_ALL, saved_locale); |
| 110 | free(saved_locale); |
| 111 | |
| 112 | entry.entry = (FLAC__byte *)buffer; |
| 113 | entry.length = strlen(buffer); |
| 114 | |
| 115 | return FLAC__metadata_object_vorbiscomment_append_comment(block, entry, /*copy=*/true); |
| 116 | } |
| 117 | |
| 118 | FLAC__bool grabbag__replaygain_is_valid_sample_frequency(unsigned sample_frequency) |
| 119 | { |
| 120 | return ValidGainFrequency( sample_frequency ); |
| 121 | } |
| 122 | |
| 123 | FLAC__bool grabbag__replaygain_init(unsigned sample_frequency) |
| 124 | { |
| 125 | title_peak_ = album_peak_ = 0.0; |
| 126 | return InitGainAnalysis((long)sample_frequency) == INIT_GAIN_ANALYSIS_OK; |
| 127 | } |
| 128 | |
| 129 | FLAC__bool grabbag__replaygain_analyze(const FLAC__int32 * const input[], FLAC__bool is_stereo, unsigned bps, unsigned samples) |
| 130 | { |
| 131 | /* using a small buffer improves data locality; we'd like it to fit easily in the dcache */ |
| 132 | static flac_float_t lbuffer[2048], rbuffer[2048]; |
| 133 | static const unsigned nbuffer = sizeof(lbuffer) / sizeof(lbuffer[0]); |
| 134 | FLAC__int32 block_peak = 0, s; |
| 135 | unsigned i, j; |
| 136 | |
| 137 | FLAC__ASSERT(bps >= 4 && bps <= FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE); |
| 138 | FLAC__ASSERT(FLAC__MIN_BITS_PER_SAMPLE == 4); |
| 139 | /* |
| 140 | * We use abs() on a FLAC__int32 which is undefined for the most negative value. |
| 141 | * If the reference codec ever handles 32bps we will have to write a special |
| 142 | * case here. |
| 143 | */ |
| 144 | FLAC__ASSERT(FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE < 32); |
| 145 | |
| 146 | if(bps == 16) { |
| 147 | if(is_stereo) { |
| 148 | j = 0; |
| 149 | while(samples > 0) { |
| 150 | const unsigned n = local_min(samples, nbuffer); |
| 151 | for(i = 0; i < n; i++, j++) { |
| 152 | s = input[0][j]; |
| 153 | lbuffer[i] = (flac_float_t)s; |
| 154 | s = abs(s); |
| 155 | block_peak = local_max(block_peak, s); |
| 156 | |
| 157 | s = input[1][j]; |
| 158 | rbuffer[i] = (flac_float_t)s; |
| 159 | s = abs(s); |
| 160 | block_peak = local_max(block_peak, s); |
| 161 | } |
| 162 | samples -= n; |
| 163 | if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK) |
| 164 | return false; |
| 165 | } |
| 166 | } |
| 167 | else { |
| 168 | j = 0; |
| 169 | while(samples > 0) { |
| 170 | const unsigned n = local_min(samples, nbuffer); |
| 171 | for(i = 0; i < n; i++, j++) { |
| 172 | s = input[0][j]; |
| 173 | lbuffer[i] = (flac_float_t)s; |
| 174 | s = abs(s); |
| 175 | block_peak = local_max(block_peak, s); |
| 176 | } |
| 177 | samples -= n; |
| 178 | if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK) |
| 179 | return false; |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | else { /* bps must be < 32 according to above assertion */ |
| 184 | const double scale = ( |
| 185 | (bps > 16)? |
| 186 | (double)1. / (double)(1u << (bps - 16)) : |
| 187 | (double)(1u << (16 - bps)) |
| 188 | ); |
| 189 | |
| 190 | if(is_stereo) { |
| 191 | j = 0; |
| 192 | while(samples > 0) { |
| 193 | const unsigned n = local_min(samples, nbuffer); |
| 194 | for(i = 0; i < n; i++, j++) { |
| 195 | s = input[0][j]; |
| 196 | lbuffer[i] = (flac_float_t)(scale * (double)s); |
| 197 | s = abs(s); |
| 198 | block_peak = local_max(block_peak, s); |
| 199 | |
| 200 | s = input[1][j]; |
| 201 | rbuffer[i] = (flac_float_t)(scale * (double)s); |
| 202 | s = abs(s); |
| 203 | block_peak = local_max(block_peak, s); |
| 204 | } |
| 205 | samples -= n; |
| 206 | if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK) |
| 207 | return false; |
| 208 | } |
| 209 | } |
| 210 | else { |
| 211 | j = 0; |
| 212 | while(samples > 0) { |
| 213 | const unsigned n = local_min(samples, nbuffer); |
| 214 | for(i = 0; i < n; i++, j++) { |
| 215 | s = input[0][j]; |
| 216 | lbuffer[i] = (flac_float_t)(scale * (double)s); |
| 217 | s = abs(s); |
| 218 | block_peak = local_max(block_peak, s); |
| 219 | } |
| 220 | samples -= n; |
| 221 | if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK) |
| 222 | return false; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | { |
| 228 | const double peak_scale = (double)(1u << (bps - 1)); |
| 229 | double peak = (double)block_peak / peak_scale; |
| 230 | if(peak > title_peak_) |
| 231 | title_peak_ = peak; |
| 232 | if(peak > album_peak_) |
| 233 | album_peak_ = peak; |
| 234 | } |
| 235 | |
| 236 | return true; |
| 237 | } |
| 238 | |
| 239 | void grabbag__replaygain_get_album(float *gain, float *peak) |
| 240 | { |
| 241 | *gain = (float)GetAlbumGain(); |
| 242 | *peak = (float)album_peak_; |
| 243 | album_peak_ = 0.0; |
| 244 | } |
| 245 | |
| 246 | void grabbag__replaygain_get_title(float *gain, float *peak) |
| 247 | { |
| 248 | *gain = (float)GetTitleGain(); |
| 249 | *peak = (float)title_peak_; |
| 250 | title_peak_ = 0.0; |
| 251 | } |
| 252 | |
| 253 | |
| 254 | typedef struct { |
| 255 | unsigned channels; |
| 256 | unsigned bits_per_sample; |
| 257 | unsigned sample_rate; |
| 258 | FLAC__bool error; |
| 259 | } DecoderInstance; |
| 260 | |
| 261 | static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) |
| 262 | { |
| 263 | DecoderInstance *instance = (DecoderInstance*)client_data; |
| 264 | const unsigned bits_per_sample = frame->header.bits_per_sample; |
| 265 | const unsigned channels = frame->header.channels; |
| 266 | const unsigned sample_rate = frame->header.sample_rate; |
| 267 | const unsigned samples = frame->header.blocksize; |
| 268 | |
| 269 | (void)decoder; |
| 270 | |
| 271 | if( |
| 272 | !instance->error && |
| 273 | (channels == 2 || channels == 1) && |
| 274 | bits_per_sample == instance->bits_per_sample && |
| 275 | channels == instance->channels && |
| 276 | sample_rate == instance->sample_rate |
| 277 | ) { |
| 278 | instance->error = !grabbag__replaygain_analyze(buffer, channels==2, bits_per_sample, samples); |
| 279 | } |
| 280 | else { |
| 281 | instance->error = true; |
| 282 | } |
| 283 | |
| 284 | if(!instance->error) |
| 285 | return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; |
| 286 | else |
| 287 | return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; |
| 288 | } |
| 289 | |
| 290 | static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) |
| 291 | { |
| 292 | DecoderInstance *instance = (DecoderInstance*)client_data; |
| 293 | |
| 294 | (void)decoder; |
| 295 | |
| 296 | if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { |
| 297 | instance->bits_per_sample = metadata->data.stream_info.bits_per_sample; |
| 298 | instance->channels = metadata->data.stream_info.channels; |
| 299 | instance->sample_rate = metadata->data.stream_info.sample_rate; |
| 300 | |
| 301 | if(instance->channels != 1 && instance->channels != 2) { |
| 302 | instance->error = true; |
| 303 | return; |
| 304 | } |
| 305 | |
| 306 | if(!grabbag__replaygain_is_valid_sample_frequency(instance->sample_rate)) { |
| 307 | instance->error = true; |
| 308 | return; |
| 309 | } |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) |
| 314 | { |
| 315 | DecoderInstance *instance = (DecoderInstance*)client_data; |
| 316 | |
| 317 | (void)decoder, (void)status; |
| 318 | |
| 319 | instance->error = true; |
| 320 | } |
| 321 | |
| 322 | const char *grabbag__replaygain_analyze_file(const char *filename, float *title_gain, float *title_peak) |
| 323 | { |
| 324 | DecoderInstance instance; |
| 325 | FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new(); |
| 326 | |
| 327 | if(0 == decoder) |
| 328 | return "memory allocation error"; |
| 329 | |
| 330 | instance.error = false; |
| 331 | |
| 332 | /* It does these three by default but lets be explicit: */ |
| 333 | FLAC__stream_decoder_set_md5_checking(decoder, false); |
| 334 | FLAC__stream_decoder_set_metadata_ignore_all(decoder); |
| 335 | FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO); |
| 336 | |
| 337 | if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &instance) != FLAC__STREAM_DECODER_INIT_STATUS_OK) { |
| 338 | FLAC__stream_decoder_delete(decoder); |
| 339 | return "initializing decoder"; |
| 340 | } |
| 341 | |
| 342 | if(!FLAC__stream_decoder_process_until_end_of_stream(decoder) || instance.error) { |
| 343 | FLAC__stream_decoder_delete(decoder); |
| 344 | return "decoding file"; |
| 345 | } |
| 346 | |
| 347 | FLAC__stream_decoder_delete(decoder); |
| 348 | |
| 349 | grabbag__replaygain_get_title(title_gain, title_peak); |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | const char *grabbag__replaygain_store_to_vorbiscomment(FLAC__StreamMetadata *block, float album_gain, float album_peak, float title_gain, float title_peak) |
| 355 | { |
| 356 | const char *error; |
| 357 | |
| 358 | if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block))) |
| 359 | return error; |
| 360 | |
| 361 | if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak))) |
| 362 | return error; |
| 363 | |
| 364 | if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak))) |
| 365 | return error; |
| 366 | |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | const char *grabbag__replaygain_store_to_vorbiscomment_reference(FLAC__StreamMetadata *block) |
| 371 | { |
| 372 | FLAC__ASSERT(0 != block); |
| 373 | FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); |
| 374 | |
| 375 | if(FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS) < 0) |
| 376 | return "memory allocation error"; |
| 377 | |
| 378 | if(!append_tag_(block, reference_format_, GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS, ReplayGainReferenceLoudness)) |
| 379 | return "memory allocation error"; |
| 380 | |
| 381 | return 0; |
| 382 | } |
| 383 | |
| 384 | const char *grabbag__replaygain_store_to_vorbiscomment_album(FLAC__StreamMetadata *block, float album_gain, float album_peak) |
| 385 | { |
| 386 | FLAC__ASSERT(0 != block); |
| 387 | FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); |
| 388 | |
| 389 | if( |
| 390 | FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN) < 0 || |
| 391 | FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK) < 0 |
| 392 | ) |
| 393 | return "memory allocation error"; |
| 394 | |
| 395 | if( |
| 396 | !append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN, album_gain) || |
| 397 | !append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK, album_peak) |
| 398 | ) |
| 399 | return "memory allocation error"; |
| 400 | |
| 401 | return 0; |
| 402 | } |
| 403 | |
| 404 | const char *grabbag__replaygain_store_to_vorbiscomment_title(FLAC__StreamMetadata *block, float title_gain, float title_peak) |
| 405 | { |
| 406 | FLAC__ASSERT(0 != block); |
| 407 | FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); |
| 408 | |
| 409 | if( |
| 410 | FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN) < 0 || |
| 411 | FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK) < 0 |
| 412 | ) |
| 413 | return "memory allocation error"; |
| 414 | |
| 415 | if( |
| 416 | !append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN, title_gain) || |
| 417 | !append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK, title_peak) |
| 418 | ) |
| 419 | return "memory allocation error"; |
| 420 | |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | static const char *store_to_file_pre_(const char *filename, FLAC__Metadata_Chain **chain, FLAC__StreamMetadata **block) |
| 425 | { |
| 426 | FLAC__Metadata_Iterator *iterator; |
| 427 | const char *error; |
| 428 | FLAC__bool found_vc_block = false; |
| 429 | |
| 430 | if(0 == (*chain = FLAC__metadata_chain_new())) |
| 431 | return "memory allocation error"; |
| 432 | |
| 433 | if(!FLAC__metadata_chain_read(*chain, filename)) { |
| 434 | error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)]; |
| 435 | FLAC__metadata_chain_delete(*chain); |
| 436 | return error; |
| 437 | } |
| 438 | |
| 439 | if(0 == (iterator = FLAC__metadata_iterator_new())) { |
| 440 | FLAC__metadata_chain_delete(*chain); |
| 441 | return "memory allocation error"; |
| 442 | } |
| 443 | |
| 444 | FLAC__metadata_iterator_init(iterator, *chain); |
| 445 | |
| 446 | do { |
| 447 | *block = FLAC__metadata_iterator_get_block(iterator); |
| 448 | if((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) |
| 449 | found_vc_block = true; |
| 450 | } while(!found_vc_block && FLAC__metadata_iterator_next(iterator)); |
| 451 | |
| 452 | if(!found_vc_block) { |
| 453 | /* create a new block */ |
| 454 | *block = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT); |
| 455 | if(0 == *block) { |
| 456 | FLAC__metadata_chain_delete(*chain); |
| 457 | FLAC__metadata_iterator_delete(iterator); |
| 458 | return "memory allocation error"; |
| 459 | } |
| 460 | while(FLAC__metadata_iterator_next(iterator)) |
| 461 | ; |
| 462 | if(!FLAC__metadata_iterator_insert_block_after(iterator, *block)) { |
| 463 | error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)]; |
| 464 | FLAC__metadata_chain_delete(*chain); |
| 465 | FLAC__metadata_iterator_delete(iterator); |
| 466 | return error; |
| 467 | } |
| 468 | /* iterator is left pointing to new block */ |
| 469 | FLAC__ASSERT(FLAC__metadata_iterator_get_block(iterator) == *block); |
| 470 | } |
| 471 | |
| 472 | FLAC__metadata_iterator_delete(iterator); |
| 473 | |
| 474 | FLAC__ASSERT(0 != *block); |
| 475 | FLAC__ASSERT((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); |
| 476 | |
| 477 | return 0; |
| 478 | } |
| 479 | |
| 480 | static const char *store_to_file_post_(const char *filename, FLAC__Metadata_Chain *chain, FLAC__bool preserve_modtime) |
| 481 | { |
| 482 | struct flac_stat_s stats; |
| 483 | const FLAC__bool have_stats = get_file_stats_(filename, &stats); |
| 484 | |
| 485 | (void)grabbag__file_change_stats(filename, /*read_only=*/false); |
| 486 | |
| 487 | FLAC__metadata_chain_sort_padding(chain); |
| 488 | if(!FLAC__metadata_chain_write(chain, /*use_padding=*/true, preserve_modtime)) { |
| 489 | const char *error; |
| 490 | error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(chain)]; |
| 491 | FLAC__metadata_chain_delete(chain); |
| 492 | return error; |
| 493 | } |
| 494 | |
| 495 | FLAC__metadata_chain_delete(chain); |
| 496 | |
| 497 | if(have_stats) |
| 498 | set_file_stats_(filename, &stats); |
| 499 | |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | const char *grabbag__replaygain_store_to_file(const char *filename, float album_gain, float album_peak, float title_gain, float title_peak, FLAC__bool preserve_modtime) |
| 504 | { |
| 505 | FLAC__Metadata_Chain *chain; |
| 506 | FLAC__StreamMetadata *block = NULL; |
| 507 | const char *error; |
| 508 | |
| 509 | if(0 != (error = store_to_file_pre_(filename, &chain, &block))) |
| 510 | return error; |
| 511 | |
| 512 | if(0 != (error = grabbag__replaygain_store_to_vorbiscomment(block, album_gain, album_peak, title_gain, title_peak))) { |
| 513 | FLAC__metadata_chain_delete(chain); |
| 514 | return error; |
| 515 | } |
| 516 | |
| 517 | if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) |
| 518 | return error; |
| 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | const char *grabbag__replaygain_store_to_file_reference(const char *filename, FLAC__bool preserve_modtime) |
| 524 | { |
| 525 | FLAC__Metadata_Chain *chain; |
| 526 | FLAC__StreamMetadata *block = NULL; |
| 527 | const char *error; |
| 528 | |
| 529 | if(0 != (error = store_to_file_pre_(filename, &chain, &block))) |
| 530 | return error; |
| 531 | |
| 532 | if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block))) { |
| 533 | FLAC__metadata_chain_delete(chain); |
| 534 | return error; |
| 535 | } |
| 536 | |
| 537 | if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) |
| 538 | return error; |
| 539 | |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | const char *grabbag__replaygain_store_to_file_album(const char *filename, float album_gain, float album_peak, FLAC__bool preserve_modtime) |
| 544 | { |
| 545 | FLAC__Metadata_Chain *chain; |
| 546 | FLAC__StreamMetadata *block = NULL; |
| 547 | const char *error; |
| 548 | |
| 549 | if(0 != (error = store_to_file_pre_(filename, &chain, &block))) |
| 550 | return error; |
| 551 | |
| 552 | if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak))) { |
| 553 | FLAC__metadata_chain_delete(chain); |
| 554 | return error; |
| 555 | } |
| 556 | |
| 557 | if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) |
| 558 | return error; |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | const char *grabbag__replaygain_store_to_file_title(const char *filename, float title_gain, float title_peak, FLAC__bool preserve_modtime) |
| 564 | { |
| 565 | FLAC__Metadata_Chain *chain; |
| 566 | FLAC__StreamMetadata *block = NULL; |
| 567 | const char *error; |
| 568 | |
| 569 | if(0 != (error = store_to_file_pre_(filename, &chain, &block))) |
| 570 | return error; |
| 571 | |
| 572 | if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak))) { |
| 573 | FLAC__metadata_chain_delete(chain); |
| 574 | return error; |
| 575 | } |
| 576 | |
| 577 | if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) |
| 578 | return error; |
| 579 | |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | static FLAC__bool parse_double_(const FLAC__StreamMetadata_VorbisComment_Entry *entry, double *val) |
| 584 | { |
| 585 | char s[32], *end; |
| 586 | const char *p, *q; |
| 587 | double v; |
| 588 | |
| 589 | FLAC__ASSERT(0 != entry); |
| 590 | FLAC__ASSERT(0 != val); |
| 591 | |
| 592 | p = (const char *)entry->entry; |
| 593 | q = strchr(p, '='); |
| 594 | if(0 == q) |
| 595 | return false; |
| 596 | q++; |
| 597 | safe_strncpy(s, q, local_min(sizeof(s), (size_t) (entry->length - (q-p)))); |
| 598 | |
| 599 | v = strtod(s, &end); |
| 600 | if(end == s) |
| 601 | return false; |
| 602 | |
| 603 | *val = v; |
| 604 | return true; |
| 605 | } |
| 606 | |
| 607 | FLAC__bool grabbag__replaygain_load_from_vorbiscomment(const FLAC__StreamMetadata *block, FLAC__bool album_mode, FLAC__bool strict, double *reference, double *gain, double *peak) |
| 608 | { |
| 609 | int reference_offset, gain_offset, peak_offset; |
| 610 | char *saved_locale; |
| 611 | FLAC__bool res = true; |
| 612 | |
| 613 | FLAC__ASSERT(0 != block); |
| 614 | FLAC__ASSERT(0 != reference); |
| 615 | FLAC__ASSERT(0 != gain); |
| 616 | FLAC__ASSERT(0 != peak); |
| 617 | FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); |
| 618 | |
| 619 | /* Default to current level until overridden by a detected tag; this |
| 620 | * will always be true until we change replaygain_analysis.c |
| 621 | */ |
| 622 | *reference = ReplayGainReferenceLoudness; |
| 623 | |
| 624 | /* |
| 625 | * We need to save the old locale and switch to "C" because the locale |
| 626 | * influences the behaviour of strtod and we want it a certain way. |
| 627 | */ |
| 628 | saved_locale = strdup(setlocale(LC_ALL, 0)); |
| 629 | if (0 == saved_locale) |
| 630 | return false; |
| 631 | setlocale(LC_ALL, "C"); |
| 632 | |
| 633 | if(0 <= (reference_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS))) |
| 634 | (void)parse_double_(block->data.vorbis_comment.comments + reference_offset, reference); |
| 635 | |
| 636 | if(0 > (gain_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)(album_mode? GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN : GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN)))) |
| 637 | res = false; |
| 638 | if(0 > (peak_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)(album_mode? GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK : GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK)))) |
| 639 | res = false; |
| 640 | |
| 641 | if(res && !parse_double_(block->data.vorbis_comment.comments + gain_offset, gain)) |
| 642 | res = false; |
| 643 | if(res && !parse_double_(block->data.vorbis_comment.comments + peak_offset, peak)) |
| 644 | res = false; |
| 645 | |
| 646 | setlocale(LC_ALL, saved_locale); |
| 647 | free(saved_locale); |
| 648 | |
| 649 | /* something failed; retry with strict */ |
| 650 | if (!res && !strict) |
| 651 | res = grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak); |
| 652 | |
| 653 | return res; |
| 654 | } |
| 655 | |
| 656 | double grabbag__replaygain_compute_scale_factor(double peak, double gain, double preamp, FLAC__bool prevent_clipping) |
| 657 | { |
| 658 | double scale; |
| 659 | FLAC__ASSERT(peak >= 0.0); |
| 660 | gain += preamp; |
| 661 | scale = (float) pow(10.0, gain * 0.05); |
| 662 | if(prevent_clipping && peak > 0.0) { |
| 663 | const double max_scale = (float)(1.0 / peak); |
| 664 | if(scale > max_scale) |
| 665 | scale = max_scale; |
| 666 | } |
| 667 | return scale; |
| 668 | } |