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Merge pull request #502 from justinweiss/restrict-threaded-rendering-drivers
[pcsx_rearmed.git] / deps / flac-1.3.2 / src / share / grabbag / replaygain.c
CommitLineData
ce188d4d 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
51static const char *reference_format_ = "%s=%2.1f dB";
52static const char *gain_format_ = "%s=%+2.2f dB";
53static const char *peak_format_ = "%s=%1.8f";
54
55static double album_peak_, title_peak_;
56
57const 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
66const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS = (const FLAC__byte * const)"REPLAYGAIN_REFERENCE_LOUDNESS";
67const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN = (const FLAC__byte * const)"REPLAYGAIN_TRACK_GAIN";
68const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK = (const FLAC__byte * const)"REPLAYGAIN_TRACK_PEAK";
69const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_GAIN";
70const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_PEAK";
71
72
73static 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
80static 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
88static 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
118FLAC__bool grabbag__replaygain_is_valid_sample_frequency(unsigned sample_frequency)
119{
120 return ValidGainFrequency( sample_frequency );
121}
122
123FLAC__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
129FLAC__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
239void 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
246void 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
254typedef struct {
255 unsigned channels;
256 unsigned bits_per_sample;
257 unsigned sample_rate;
258 FLAC__bool error;
259} DecoderInstance;
260
261static 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
290static 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
313static 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
322const 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
354const 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
370const 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
384const 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
404const 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
424static 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
480static 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
503const 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
523const 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
543const 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
563const 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
583static 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
607FLAC__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
656double 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}
ARM optimized PCSX fork