1 /* grabbag - Convenience lib for various routines common to several tools
2 * Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * This library 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 GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #if HAVE_CONFIG_H
20 # include <config.h>
21 #endif
22
23 #include "share/grabbag.h"
24 #include "share/replaygain_analysis.h"
25 #include "FLAC/assert.h"
26 #include "FLAC/metadata.h"
27 #include "FLAC/stream_decoder.h"
28 #include <locale.h>
29 #include <math.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #if defined _MSC_VER || defined __MINGW32__
34 #include <io.h> /* for chmod() */
35 #endif
36 #include <sys/stat.h> /* for stat(), maybe chmod() */
37
38 #ifdef local_min
39 #undef local_min
40 #endif
41 #define local_min(a,b) ((a)<(b)?(a):(b))
42
43 #ifdef local_max
44 #undef local_max
45 #endif
46 #define local_max(a,b) ((a)>(b)?(a):(b))
47
48 static const char *reference_format_ = "%s=%2.1f dB";
49 static const char *gain_format_ = "%s=%+2.2f dB";
50 static const char *peak_format_ = "%s=%1.8f";
51
52 static double album_peak_, title_peak_;
53
54 const unsigned GRABBAG__REPLAYGAIN_MAX_TAG_SPACE_REQUIRED = 190;
55 /*
56 FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 29 + 1 + 8 +
57 FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 +
58 FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12 +
59 FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 +
60 FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12
61 */
62
63 const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS = (const FLAC__byte * const)"REPLAYGAIN_REFERENCE_LOUDNESS";
64 const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN = (const FLAC__byte * const)"REPLAYGAIN_TRACK_GAIN";
65 const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK = (const FLAC__byte * const)"REPLAYGAIN_TRACK_PEAK";
66 const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_GAIN";
67 const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_PEAK";
68
69
get_file_stats_(const char * filename,struct stat * stats)70 static FLAC__bool get_file_stats_(const char *filename, struct stat *stats)
71 {
72 FLAC__ASSERT(0 != filename);
73 FLAC__ASSERT(0 != stats);
74 return (0 == stat(filename, stats));
75 }
76
set_file_stats_(const char * filename,struct stat * stats)77 static void set_file_stats_(const char *filename, struct stat *stats)
78 {
79 FLAC__ASSERT(0 != filename);
80 FLAC__ASSERT(0 != stats);
81
82 (void)chmod(filename, stats->st_mode);
83 }
84
append_tag_(FLAC__StreamMetadata * block,const char * format,const FLAC__byte * name,float value)85 static FLAC__bool append_tag_(FLAC__StreamMetadata *block, const char *format, const FLAC__byte *name, float value)
86 {
87 char buffer[256];
88 char *saved_locale;
89 FLAC__StreamMetadata_VorbisComment_Entry entry;
90
91 FLAC__ASSERT(0 != block);
92 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
93 FLAC__ASSERT(0 != format);
94 FLAC__ASSERT(0 != name);
95
96 buffer[sizeof(buffer)-1] = '\0';
97 /*
98 * We need to save the old locale and switch to "C" because the locale
99 * influences the formatting of %f and we want it a certain way.
100 */
101 saved_locale = strdup(setlocale(LC_ALL, 0));
102 if (0 == saved_locale)
103 return false;
104 setlocale(LC_ALL, "C");
105 #if defined _MSC_VER || defined __MINGW32__
106 _snprintf(buffer, sizeof(buffer)-1, format, name, value);
107 #else
108 snprintf(buffer, sizeof(buffer)-1, format, name, value);
109 #endif
110 setlocale(LC_ALL, saved_locale);
111 free(saved_locale);
112
113 entry.entry = (FLAC__byte *)buffer;
114 entry.length = strlen(buffer);
115
116 return FLAC__metadata_object_vorbiscomment_append_comment(block, entry, /*copy=*/true);
117 }
118
grabbag__replaygain_is_valid_sample_frequency(unsigned sample_frequency)119 FLAC__bool grabbag__replaygain_is_valid_sample_frequency(unsigned sample_frequency)
120 {
121 static const unsigned valid_sample_rates[] = {
122 8000,
123 11025,
124 12000,
125 16000,
126 22050,
127 24000,
128 32000,
129 44100,
130 48000
131 };
132 static const unsigned n_valid_sample_rates = sizeof(valid_sample_rates) / sizeof(valid_sample_rates[0]);
133
134 unsigned i;
135
136 for(i = 0; i < n_valid_sample_rates; i++)
137 if(sample_frequency == valid_sample_rates[i])
138 return true;
139 return false;
140 }
141
grabbag__replaygain_init(unsigned sample_frequency)142 FLAC__bool grabbag__replaygain_init(unsigned sample_frequency)
143 {
144 title_peak_ = album_peak_ = 0.0;
145 return InitGainAnalysis((long)sample_frequency) == INIT_GAIN_ANALYSIS_OK;
146 }
147
grabbag__replaygain_analyze(const FLAC__int32 * const input[],FLAC__bool is_stereo,unsigned bps,unsigned samples)148 FLAC__bool grabbag__replaygain_analyze(const FLAC__int32 * const input[], FLAC__bool is_stereo, unsigned bps, unsigned samples)
149 {
150 /* using a small buffer improves data locality; we'd like it to fit easily in the dcache */
151 static Float_t lbuffer[2048], rbuffer[2048];
152 static const unsigned nbuffer = sizeof(lbuffer) / sizeof(lbuffer[0]);
153 FLAC__int32 block_peak = 0, s;
154 unsigned i, j;
155
156 FLAC__ASSERT(bps >= 4 && bps <= FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE);
157 FLAC__ASSERT(FLAC__MIN_BITS_PER_SAMPLE == 4);
158 /*
159 * We use abs() on a FLAC__int32 which is undefined for the most negative value.
160 * If the reference codec ever handles 32bps we will have to write a special
161 * case here.
162 */
163 FLAC__ASSERT(FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE < 32);
164
165 if(bps == 16) {
166 if(is_stereo) {
167 j = 0;
168 while(samples > 0) {
169 const unsigned n = local_min(samples, nbuffer);
170 for(i = 0; i < n; i++, j++) {
171 s = input[0][j];
172 lbuffer[i] = (Float_t)s;
173 s = abs(s);
174 block_peak = local_max(block_peak, s);
175
176 s = input[1][j];
177 rbuffer[i] = (Float_t)s;
178 s = abs(s);
179 block_peak = local_max(block_peak, s);
180 }
181 samples -= n;
182 if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK)
183 return false;
184 }
185 }
186 else {
187 j = 0;
188 while(samples > 0) {
189 const unsigned n = local_min(samples, nbuffer);
190 for(i = 0; i < n; i++, j++) {
191 s = input[0][j];
192 lbuffer[i] = (Float_t)s;
193 s = abs(s);
194 block_peak = local_max(block_peak, s);
195 }
196 samples -= n;
197 if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK)
198 return false;
199 }
200 }
201 }
202 else { /* bps must be < 32 according to above assertion */
203 const double scale = (
204 (bps > 16)?
205 (double)1. / (double)(1u << (bps - 16)) :
206 (double)(1u << (16 - bps))
207 );
208
209 if(is_stereo) {
210 j = 0;
211 while(samples > 0) {
212 const unsigned n = local_min(samples, nbuffer);
213 for(i = 0; i < n; i++, j++) {
214 s = input[0][j];
215 lbuffer[i] = (Float_t)(scale * (double)s);
216 s = abs(s);
217 block_peak = local_max(block_peak, s);
218
219 s = input[1][j];
220 rbuffer[i] = (Float_t)(scale * (double)s);
221 s = abs(s);
222 block_peak = local_max(block_peak, s);
223 }
224 samples -= n;
225 if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK)
226 return false;
227 }
228 }
229 else {
230 j = 0;
231 while(samples > 0) {
232 const unsigned n = local_min(samples, nbuffer);
233 for(i = 0; i < n; i++, j++) {
234 s = input[0][j];
235 lbuffer[i] = (Float_t)(scale * (double)s);
236 s = abs(s);
237 block_peak = local_max(block_peak, s);
238 }
239 samples -= n;
240 if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK)
241 return false;
242 }
243 }
244 }
245
246 {
247 const double peak_scale = (double)(1u << (bps - 1));
248 double peak = (double)block_peak / peak_scale;
249 if(peak > title_peak_)
250 title_peak_ = peak;
251 if(peak > album_peak_)
252 album_peak_ = peak;
253 }
254
255 return true;
256 }
257
grabbag__replaygain_get_album(float * gain,float * peak)258 void grabbag__replaygain_get_album(float *gain, float *peak)
259 {
260 *gain = (float)GetAlbumGain();
261 *peak = (float)album_peak_;
262 album_peak_ = 0.0;
263 }
264
grabbag__replaygain_get_title(float * gain,float * peak)265 void grabbag__replaygain_get_title(float *gain, float *peak)
266 {
267 *gain = (float)GetTitleGain();
268 *peak = (float)title_peak_;
269 title_peak_ = 0.0;
270 }
271
272
273 typedef struct {
274 unsigned channels;
275 unsigned bits_per_sample;
276 unsigned sample_rate;
277 FLAC__bool error;
278 } DecoderInstance;
279
write_callback_(const FLAC__StreamDecoder * decoder,const FLAC__Frame * frame,const FLAC__int32 * const buffer[],void * client_data)280 static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data)
281 {
282 DecoderInstance *instance = (DecoderInstance*)client_data;
283 const unsigned bits_per_sample = frame->header.bits_per_sample;
284 const unsigned channels = frame->header.channels;
285 const unsigned sample_rate = frame->header.sample_rate;
286 const unsigned samples = frame->header.blocksize;
287
288 (void)decoder;
289
290 if(
291 !instance->error &&
292 (channels == 2 || channels == 1) &&
293 bits_per_sample == instance->bits_per_sample &&
294 channels == instance->channels &&
295 sample_rate == instance->sample_rate
296 ) {
297 instance->error = !grabbag__replaygain_analyze(buffer, channels==2, bits_per_sample, samples);
298 }
299 else {
300 instance->error = true;
301 }
302
303 if(!instance->error)
304 return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
305 else
306 return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
307 }
308
metadata_callback_(const FLAC__StreamDecoder * decoder,const FLAC__StreamMetadata * metadata,void * client_data)309 static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data)
310 {
311 DecoderInstance *instance = (DecoderInstance*)client_data;
312
313 (void)decoder;
314
315 if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
316 instance->bits_per_sample = metadata->data.stream_info.bits_per_sample;
317 instance->channels = metadata->data.stream_info.channels;
318 instance->sample_rate = metadata->data.stream_info.sample_rate;
319
320 if(instance->channels != 1 && instance->channels != 2) {
321 instance->error = true;
322 return;
323 }
324
325 if(!grabbag__replaygain_is_valid_sample_frequency(instance->sample_rate)) {
326 instance->error = true;
327 return;
328 }
329 }
330 }
331
error_callback_(const FLAC__StreamDecoder * decoder,FLAC__StreamDecoderErrorStatus status,void * client_data)332 static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data)
333 {
334 DecoderInstance *instance = (DecoderInstance*)client_data;
335
336 (void)decoder, (void)status;
337
338 instance->error = true;
339 }
340
grabbag__replaygain_analyze_file(const char * filename,float * title_gain,float * title_peak)341 const char *grabbag__replaygain_analyze_file(const char *filename, float *title_gain, float *title_peak)
342 {
343 DecoderInstance instance;
344 FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new();
345
346 if(0 == decoder)
347 return "memory allocation error";
348
349 instance.error = false;
350
351 /* It does these three by default but lets be explicit: */
352 FLAC__stream_decoder_set_md5_checking(decoder, false);
353 FLAC__stream_decoder_set_metadata_ignore_all(decoder);
354 FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO);
355
356 if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &instance) != FLAC__STREAM_DECODER_INIT_STATUS_OK) {
357 FLAC__stream_decoder_delete(decoder);
358 return "initializing decoder";
359 }
360
361 if(!FLAC__stream_decoder_process_until_end_of_stream(decoder) || instance.error) {
362 FLAC__stream_decoder_delete(decoder);
363 return "decoding file";
364 }
365
366 FLAC__stream_decoder_delete(decoder);
367
368 grabbag__replaygain_get_title(title_gain, title_peak);
369
370 return 0;
371 }
372
grabbag__replaygain_store_to_vorbiscomment(FLAC__StreamMetadata * block,float album_gain,float album_peak,float title_gain,float title_peak)373 const char *grabbag__replaygain_store_to_vorbiscomment(FLAC__StreamMetadata *block, float album_gain, float album_peak, float title_gain, float title_peak)
374 {
375 const char *error;
376
377 if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block)))
378 return error;
379
380 if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak)))
381 return error;
382
383 if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak)))
384 return error;
385
386 return 0;
387 }
388
grabbag__replaygain_store_to_vorbiscomment_reference(FLAC__StreamMetadata * block)389 const char *grabbag__replaygain_store_to_vorbiscomment_reference(FLAC__StreamMetadata *block)
390 {
391 FLAC__ASSERT(0 != block);
392 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
393
394 if(FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS) < 0)
395 return "memory allocation error";
396
397 if(!append_tag_(block, reference_format_, GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS, ReplayGainReferenceLoudness))
398 return "memory allocation error";
399
400 return 0;
401 }
402
grabbag__replaygain_store_to_vorbiscomment_album(FLAC__StreamMetadata * block,float album_gain,float album_peak)403 const char *grabbag__replaygain_store_to_vorbiscomment_album(FLAC__StreamMetadata *block, float album_gain, float album_peak)
404 {
405 FLAC__ASSERT(0 != block);
406 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
407
408 if(
409 FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN) < 0 ||
410 FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK) < 0
411 )
412 return "memory allocation error";
413
414 if(
415 !append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN, album_gain) ||
416 !append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK, album_peak)
417 )
418 return "memory allocation error";
419
420 return 0;
421 }
422
grabbag__replaygain_store_to_vorbiscomment_title(FLAC__StreamMetadata * block,float title_gain,float title_peak)423 const char *grabbag__replaygain_store_to_vorbiscomment_title(FLAC__StreamMetadata *block, float title_gain, float title_peak)
424 {
425 FLAC__ASSERT(0 != block);
426 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
427
428 if(
429 FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN) < 0 ||
430 FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK) < 0
431 )
432 return "memory allocation error";
433
434 if(
435 !append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN, title_gain) ||
436 !append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK, title_peak)
437 )
438 return "memory allocation error";
439
440 return 0;
441 }
442
store_to_file_pre_(const char * filename,FLAC__Metadata_Chain ** chain,FLAC__StreamMetadata ** block)443 static const char *store_to_file_pre_(const char *filename, FLAC__Metadata_Chain **chain, FLAC__StreamMetadata **block)
444 {
445 FLAC__Metadata_Iterator *iterator;
446 const char *error;
447 FLAC__bool found_vc_block = false;
448
449 if(0 == (*chain = FLAC__metadata_chain_new()))
450 return "memory allocation error";
451
452 if(!FLAC__metadata_chain_read(*chain, filename)) {
453 error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)];
454 FLAC__metadata_chain_delete(*chain);
455 return error;
456 }
457
458 if(0 == (iterator = FLAC__metadata_iterator_new())) {
459 FLAC__metadata_chain_delete(*chain);
460 return "memory allocation error";
461 }
462
463 FLAC__metadata_iterator_init(iterator, *chain);
464
465 do {
466 *block = FLAC__metadata_iterator_get_block(iterator);
467 if((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT)
468 found_vc_block = true;
469 } while(!found_vc_block && FLAC__metadata_iterator_next(iterator));
470
471 if(!found_vc_block) {
472 /* create a new block */
473 *block = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT);
474 if(0 == *block) {
475 FLAC__metadata_chain_delete(*chain);
476 FLAC__metadata_iterator_delete(iterator);
477 return "memory allocation error";
478 }
479 while(FLAC__metadata_iterator_next(iterator))
480 ;
481 if(!FLAC__metadata_iterator_insert_block_after(iterator, *block)) {
482 error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)];
483 FLAC__metadata_chain_delete(*chain);
484 FLAC__metadata_iterator_delete(iterator);
485 return error;
486 }
487 /* iterator is left pointing to new block */
488 FLAC__ASSERT(FLAC__metadata_iterator_get_block(iterator) == *block);
489 }
490
491 FLAC__metadata_iterator_delete(iterator);
492
493 FLAC__ASSERT(0 != *block);
494 FLAC__ASSERT((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
495
496 return 0;
497 }
498
store_to_file_post_(const char * filename,FLAC__Metadata_Chain * chain,FLAC__bool preserve_modtime)499 static const char *store_to_file_post_(const char *filename, FLAC__Metadata_Chain *chain, FLAC__bool preserve_modtime)
500 {
501 struct stat stats;
502 const FLAC__bool have_stats = get_file_stats_(filename, &stats);
503
504 (void)grabbag__file_change_stats(filename, /*read_only=*/false);
505
506 FLAC__metadata_chain_sort_padding(chain);
507 if(!FLAC__metadata_chain_write(chain, /*use_padding=*/true, preserve_modtime)) {
508 FLAC__metadata_chain_delete(chain);
509 return FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(chain)];
510 }
511
512 FLAC__metadata_chain_delete(chain);
513
514 if(have_stats)
515 set_file_stats_(filename, &stats);
516
517 return 0;
518 }
519
grabbag__replaygain_store_to_file(const char * filename,float album_gain,float album_peak,float title_gain,float title_peak,FLAC__bool preserve_modtime)520 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)
521 {
522 FLAC__Metadata_Chain *chain;
523 FLAC__StreamMetadata *block;
524 const char *error;
525
526 if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
527 return error;
528
529 if(0 != (error = grabbag__replaygain_store_to_vorbiscomment(block, album_gain, album_peak, title_gain, title_peak))) {
530 FLAC__metadata_chain_delete(chain);
531 return error;
532 }
533
534 if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
535 return error;
536
537 return 0;
538 }
539
grabbag__replaygain_store_to_file_reference(const char * filename,FLAC__bool preserve_modtime)540 const char *grabbag__replaygain_store_to_file_reference(const char *filename, FLAC__bool preserve_modtime)
541 {
542 FLAC__Metadata_Chain *chain;
543 FLAC__StreamMetadata *block;
544 const char *error;
545
546 if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
547 return error;
548
549 if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block))) {
550 FLAC__metadata_chain_delete(chain);
551 return error;
552 }
553
554 if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
555 return error;
556
557 return 0;
558 }
559
grabbag__replaygain_store_to_file_album(const char * filename,float album_gain,float album_peak,FLAC__bool preserve_modtime)560 const char *grabbag__replaygain_store_to_file_album(const char *filename, float album_gain, float album_peak, FLAC__bool preserve_modtime)
561 {
562 FLAC__Metadata_Chain *chain;
563 FLAC__StreamMetadata *block;
564 const char *error;
565
566 if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
567 return error;
568
569 if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak))) {
570 FLAC__metadata_chain_delete(chain);
571 return error;
572 }
573
574 if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
575 return error;
576
577 return 0;
578 }
579
grabbag__replaygain_store_to_file_title(const char * filename,float title_gain,float title_peak,FLAC__bool preserve_modtime)580 const char *grabbag__replaygain_store_to_file_title(const char *filename, float title_gain, float title_peak, FLAC__bool preserve_modtime)
581 {
582 FLAC__Metadata_Chain *chain;
583 FLAC__StreamMetadata *block;
584 const char *error;
585
586 if(0 != (error = store_to_file_pre_(filename, &chain, &block)))
587 return error;
588
589 if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak))) {
590 FLAC__metadata_chain_delete(chain);
591 return error;
592 }
593
594 if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime)))
595 return error;
596
597 return 0;
598 }
599
parse_double_(const FLAC__StreamMetadata_VorbisComment_Entry * entry,double * val)600 static FLAC__bool parse_double_(const FLAC__StreamMetadata_VorbisComment_Entry *entry, double *val)
601 {
602 char s[32], *end;
603 const char *p, *q;
604 double v;
605
606 FLAC__ASSERT(0 != entry);
607 FLAC__ASSERT(0 != val);
608
609 p = (const char *)entry->entry;
610 q = strchr(p, '=');
611 if(0 == q)
612 return false;
613 q++;
614 memset(s, 0, sizeof(s)-1);
615 strncpy(s, q, local_min(sizeof(s)-1, entry->length - (q-p)));
616
617 v = strtod(s, &end);
618 if(end == s)
619 return false;
620
621 *val = v;
622 return true;
623 }
624
grabbag__replaygain_load_from_vorbiscomment(const FLAC__StreamMetadata * block,FLAC__bool album_mode,FLAC__bool strict,double * reference,double * gain,double * peak)625 FLAC__bool grabbag__replaygain_load_from_vorbiscomment(const FLAC__StreamMetadata *block, FLAC__bool album_mode, FLAC__bool strict, double *reference, double *gain, double *peak)
626 {
627 int reference_offset, gain_offset, peak_offset;
628
629 FLAC__ASSERT(0 != block);
630 FLAC__ASSERT(0 != reference);
631 FLAC__ASSERT(0 != gain);
632 FLAC__ASSERT(0 != peak);
633 FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT);
634
635 /* Default to current level until overridden by a detected tag; this
636 * will always be true until we change replaygain_analysis.c
637 */
638 *reference = ReplayGainReferenceLoudness;
639
640 if(0 <= (reference_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS)))
641 (void)parse_double_(block->data.vorbis_comment.comments + reference_offset, reference);
642
643 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))))
644 return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
645 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))))
646 return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
647
648 if(!parse_double_(block->data.vorbis_comment.comments + gain_offset, gain))
649 return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
650 if(!parse_double_(block->data.vorbis_comment.comments + peak_offset, peak))
651 return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
652
653 return true;
654 }
655
grabbag__replaygain_compute_scale_factor(double peak,double gain,double preamp,FLAC__bool prevent_clipping)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 }
669