diff options
Diffstat (limited to 'deps/flac-1.3.2/src/share/grabbag/replaygain.c')
| -rw-r--r-- | deps/flac-1.3.2/src/share/grabbag/replaygain.c | 668 |
1 files changed, 0 insertions, 668 deletions
diff --git a/deps/flac-1.3.2/src/share/grabbag/replaygain.c b/deps/flac-1.3.2/src/share/grabbag/replaygain.c deleted file mode 100644 index ad3138f..0000000 --- a/deps/flac-1.3.2/src/share/grabbag/replaygain.c +++ /dev/null @@ -1,668 +0,0 @@ -/* grabbag - Convenience lib for various routines common to several tools - * Copyright (C) 2002-2009 Josh Coalson - * Copyright (C) 2011-2016 Xiph.Org Foundation - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.1 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif - -#include <locale.h> -#include <math.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#if defined _MSC_VER || defined __MINGW32__ -#include <io.h> /* for chmod() */ -#endif -#include <sys/stat.h> /* for stat(), maybe chmod() */ - -#include "FLAC/assert.h" -#include "FLAC/metadata.h" -#include "FLAC/stream_decoder.h" -#include "share/grabbag.h" -#include "share/replaygain_analysis.h" -#include "share/safe_str.h" - -#ifdef local_min -#undef local_min -#endif -#define local_min(a,b) ((a)<(b)?(a):(b)) - -#ifdef local_max -#undef local_max -#endif -#define local_max(a,b) ((a)>(b)?(a):(b)) - -static const char *reference_format_ = "%s=%2.1f dB"; -static const char *gain_format_ = "%s=%+2.2f dB"; -static const char *peak_format_ = "%s=%1.8f"; - -static double album_peak_, title_peak_; - -const unsigned GRABBAG__REPLAYGAIN_MAX_TAG_SPACE_REQUIRED = 190; -/* - FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 29 + 1 + 8 + - FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 + - FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12 + - FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 10 + - FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN/8 + 21 + 1 + 12 -*/ - -const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS = (const FLAC__byte * const)"REPLAYGAIN_REFERENCE_LOUDNESS"; -const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN = (const FLAC__byte * const)"REPLAYGAIN_TRACK_GAIN"; -const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK = (const FLAC__byte * const)"REPLAYGAIN_TRACK_PEAK"; -const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_GAIN"; -const FLAC__byte * const GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK = (const FLAC__byte * const)"REPLAYGAIN_ALBUM_PEAK"; - - -static FLAC__bool get_file_stats_(const char *filename, struct flac_stat_s *stats) -{ - FLAC__ASSERT(0 != filename); - FLAC__ASSERT(0 != stats); - return (0 == flac_stat(filename, stats)); -} - -static void set_file_stats_(const char *filename, struct flac_stat_s *stats) -{ - FLAC__ASSERT(0 != filename); - FLAC__ASSERT(0 != stats); - - (void)flac_chmod(filename, stats->st_mode); -} - -static FLAC__bool append_tag_(FLAC__StreamMetadata *block, const char *format, const FLAC__byte *name, float value) -{ - char buffer[256]; - char *saved_locale; - FLAC__StreamMetadata_VorbisComment_Entry entry; - - FLAC__ASSERT(0 != block); - FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); - FLAC__ASSERT(0 != format); - FLAC__ASSERT(0 != name); - - buffer[sizeof(buffer)-1] = '\0'; - /* - * We need to save the old locale and switch to "C" because the locale - * influences the formatting of %f and we want it a certain way. - */ - saved_locale = strdup(setlocale(LC_ALL, 0)); - if (0 == saved_locale) - return false; - setlocale(LC_ALL, "C"); - flac_snprintf(buffer, sizeof(buffer), format, name, value); - setlocale(LC_ALL, saved_locale); - free(saved_locale); - - entry.entry = (FLAC__byte *)buffer; - entry.length = strlen(buffer); - - return FLAC__metadata_object_vorbiscomment_append_comment(block, entry, /*copy=*/true); -} - -FLAC__bool grabbag__replaygain_is_valid_sample_frequency(unsigned sample_frequency) -{ - return ValidGainFrequency( sample_frequency ); -} - -FLAC__bool grabbag__replaygain_init(unsigned sample_frequency) -{ - title_peak_ = album_peak_ = 0.0; - return InitGainAnalysis((long)sample_frequency) == INIT_GAIN_ANALYSIS_OK; -} - -FLAC__bool grabbag__replaygain_analyze(const FLAC__int32 * const input[], FLAC__bool is_stereo, unsigned bps, unsigned samples) -{ - /* using a small buffer improves data locality; we'd like it to fit easily in the dcache */ - static flac_float_t lbuffer[2048], rbuffer[2048]; - static const unsigned nbuffer = sizeof(lbuffer) / sizeof(lbuffer[0]); - FLAC__int32 block_peak = 0, s; - unsigned i, j; - - FLAC__ASSERT(bps >= 4 && bps <= FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE); - FLAC__ASSERT(FLAC__MIN_BITS_PER_SAMPLE == 4); - /* - * We use abs() on a FLAC__int32 which is undefined for the most negative value. - * If the reference codec ever handles 32bps we will have to write a special - * case here. - */ - FLAC__ASSERT(FLAC__REFERENCE_CODEC_MAX_BITS_PER_SAMPLE < 32); - - if(bps == 16) { - if(is_stereo) { - j = 0; - while(samples > 0) { - const unsigned n = local_min(samples, nbuffer); - for(i = 0; i < n; i++, j++) { - s = input[0][j]; - lbuffer[i] = (flac_float_t)s; - s = abs(s); - block_peak = local_max(block_peak, s); - - s = input[1][j]; - rbuffer[i] = (flac_float_t)s; - s = abs(s); - block_peak = local_max(block_peak, s); - } - samples -= n; - if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK) - return false; - } - } - else { - j = 0; - while(samples > 0) { - const unsigned n = local_min(samples, nbuffer); - for(i = 0; i < n; i++, j++) { - s = input[0][j]; - lbuffer[i] = (flac_float_t)s; - s = abs(s); - block_peak = local_max(block_peak, s); - } - samples -= n; - if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK) - return false; - } - } - } - else { /* bps must be < 32 according to above assertion */ - const double scale = ( - (bps > 16)? - (double)1. / (double)(1u << (bps - 16)) : - (double)(1u << (16 - bps)) - ); - - if(is_stereo) { - j = 0; - while(samples > 0) { - const unsigned n = local_min(samples, nbuffer); - for(i = 0; i < n; i++, j++) { - s = input[0][j]; - lbuffer[i] = (flac_float_t)(scale * (double)s); - s = abs(s); - block_peak = local_max(block_peak, s); - - s = input[1][j]; - rbuffer[i] = (flac_float_t)(scale * (double)s); - s = abs(s); - block_peak = local_max(block_peak, s); - } - samples -= n; - if(AnalyzeSamples(lbuffer, rbuffer, n, 2) != GAIN_ANALYSIS_OK) - return false; - } - } - else { - j = 0; - while(samples > 0) { - const unsigned n = local_min(samples, nbuffer); - for(i = 0; i < n; i++, j++) { - s = input[0][j]; - lbuffer[i] = (flac_float_t)(scale * (double)s); - s = abs(s); - block_peak = local_max(block_peak, s); - } - samples -= n; - if(AnalyzeSamples(lbuffer, 0, n, 1) != GAIN_ANALYSIS_OK) - return false; - } - } - } - - { - const double peak_scale = (double)(1u << (bps - 1)); - double peak = (double)block_peak / peak_scale; - if(peak > title_peak_) - title_peak_ = peak; - if(peak > album_peak_) - album_peak_ = peak; - } - - return true; -} - -void grabbag__replaygain_get_album(float *gain, float *peak) -{ - *gain = (float)GetAlbumGain(); - *peak = (float)album_peak_; - album_peak_ = 0.0; -} - -void grabbag__replaygain_get_title(float *gain, float *peak) -{ - *gain = (float)GetTitleGain(); - *peak = (float)title_peak_; - title_peak_ = 0.0; -} - - -typedef struct { - unsigned channels; - unsigned bits_per_sample; - unsigned sample_rate; - FLAC__bool error; -} DecoderInstance; - -static FLAC__StreamDecoderWriteStatus write_callback_(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *client_data) -{ - DecoderInstance *instance = (DecoderInstance*)client_data; - const unsigned bits_per_sample = frame->header.bits_per_sample; - const unsigned channels = frame->header.channels; - const unsigned sample_rate = frame->header.sample_rate; - const unsigned samples = frame->header.blocksize; - - (void)decoder; - - if( - !instance->error && - (channels == 2 || channels == 1) && - bits_per_sample == instance->bits_per_sample && - channels == instance->channels && - sample_rate == instance->sample_rate - ) { - instance->error = !grabbag__replaygain_analyze(buffer, channels==2, bits_per_sample, samples); - } - else { - instance->error = true; - } - - if(!instance->error) - return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; - else - return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; -} - -static void metadata_callback_(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data) -{ - DecoderInstance *instance = (DecoderInstance*)client_data; - - (void)decoder; - - if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) { - instance->bits_per_sample = metadata->data.stream_info.bits_per_sample; - instance->channels = metadata->data.stream_info.channels; - instance->sample_rate = metadata->data.stream_info.sample_rate; - - if(instance->channels != 1 && instance->channels != 2) { - instance->error = true; - return; - } - - if(!grabbag__replaygain_is_valid_sample_frequency(instance->sample_rate)) { - instance->error = true; - return; - } - } -} - -static void error_callback_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data) -{ - DecoderInstance *instance = (DecoderInstance*)client_data; - - (void)decoder, (void)status; - - instance->error = true; -} - -const char *grabbag__replaygain_analyze_file(const char *filename, float *title_gain, float *title_peak) -{ - DecoderInstance instance; - FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new(); - - if(0 == decoder) - return "memory allocation error"; - - instance.error = false; - - /* It does these three by default but lets be explicit: */ - FLAC__stream_decoder_set_md5_checking(decoder, false); - FLAC__stream_decoder_set_metadata_ignore_all(decoder); - FLAC__stream_decoder_set_metadata_respond(decoder, FLAC__METADATA_TYPE_STREAMINFO); - - if(FLAC__stream_decoder_init_file(decoder, filename, write_callback_, metadata_callback_, error_callback_, &instance) != FLAC__STREAM_DECODER_INIT_STATUS_OK) { - FLAC__stream_decoder_delete(decoder); - return "initializing decoder"; - } - - if(!FLAC__stream_decoder_process_until_end_of_stream(decoder) || instance.error) { - FLAC__stream_decoder_delete(decoder); - return "decoding file"; - } - - FLAC__stream_decoder_delete(decoder); - - grabbag__replaygain_get_title(title_gain, title_peak); - - return 0; -} - -const char *grabbag__replaygain_store_to_vorbiscomment(FLAC__StreamMetadata *block, float album_gain, float album_peak, float title_gain, float title_peak) -{ - const char *error; - - if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block))) - return error; - - if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak))) - return error; - - if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak))) - return error; - - return 0; -} - -const char *grabbag__replaygain_store_to_vorbiscomment_reference(FLAC__StreamMetadata *block) -{ - FLAC__ASSERT(0 != block); - FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); - - if(FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS) < 0) - return "memory allocation error"; - - if(!append_tag_(block, reference_format_, GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS, ReplayGainReferenceLoudness)) - return "memory allocation error"; - - return 0; -} - -const char *grabbag__replaygain_store_to_vorbiscomment_album(FLAC__StreamMetadata *block, float album_gain, float album_peak) -{ - FLAC__ASSERT(0 != block); - FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); - - if( - FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN) < 0 || - FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK) < 0 - ) - return "memory allocation error"; - - if( - !append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_GAIN, album_gain) || - !append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_ALBUM_PEAK, album_peak) - ) - return "memory allocation error"; - - return 0; -} - -const char *grabbag__replaygain_store_to_vorbiscomment_title(FLAC__StreamMetadata *block, float title_gain, float title_peak) -{ - FLAC__ASSERT(0 != block); - FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); - - if( - FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN) < 0 || - FLAC__metadata_object_vorbiscomment_remove_entries_matching(block, (const char *)GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK) < 0 - ) - return "memory allocation error"; - - if( - !append_tag_(block, gain_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_GAIN, title_gain) || - !append_tag_(block, peak_format_, GRABBAG__REPLAYGAIN_TAG_TITLE_PEAK, title_peak) - ) - return "memory allocation error"; - - return 0; -} - -static const char *store_to_file_pre_(const char *filename, FLAC__Metadata_Chain **chain, FLAC__StreamMetadata **block) -{ - FLAC__Metadata_Iterator *iterator; - const char *error; - FLAC__bool found_vc_block = false; - - if(0 == (*chain = FLAC__metadata_chain_new())) - return "memory allocation error"; - - if(!FLAC__metadata_chain_read(*chain, filename)) { - error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)]; - FLAC__metadata_chain_delete(*chain); - return error; - } - - if(0 == (iterator = FLAC__metadata_iterator_new())) { - FLAC__metadata_chain_delete(*chain); - return "memory allocation error"; - } - - FLAC__metadata_iterator_init(iterator, *chain); - - do { - *block = FLAC__metadata_iterator_get_block(iterator); - if((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT) - found_vc_block = true; - } while(!found_vc_block && FLAC__metadata_iterator_next(iterator)); - - if(!found_vc_block) { - /* create a new block */ - *block = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT); - if(0 == *block) { - FLAC__metadata_chain_delete(*chain); - FLAC__metadata_iterator_delete(iterator); - return "memory allocation error"; - } - while(FLAC__metadata_iterator_next(iterator)) - ; - if(!FLAC__metadata_iterator_insert_block_after(iterator, *block)) { - error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(*chain)]; - FLAC__metadata_chain_delete(*chain); - FLAC__metadata_iterator_delete(iterator); - return error; - } - /* iterator is left pointing to new block */ - FLAC__ASSERT(FLAC__metadata_iterator_get_block(iterator) == *block); - } - - FLAC__metadata_iterator_delete(iterator); - - FLAC__ASSERT(0 != *block); - FLAC__ASSERT((*block)->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); - - return 0; -} - -static const char *store_to_file_post_(const char *filename, FLAC__Metadata_Chain *chain, FLAC__bool preserve_modtime) -{ - struct flac_stat_s stats; - const FLAC__bool have_stats = get_file_stats_(filename, &stats); - - (void)grabbag__file_change_stats(filename, /*read_only=*/false); - - FLAC__metadata_chain_sort_padding(chain); - if(!FLAC__metadata_chain_write(chain, /*use_padding=*/true, preserve_modtime)) { - const char *error; - error = FLAC__Metadata_ChainStatusString[FLAC__metadata_chain_status(chain)]; - FLAC__metadata_chain_delete(chain); - return error; - } - - FLAC__metadata_chain_delete(chain); - - if(have_stats) - set_file_stats_(filename, &stats); - - return 0; -} - -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) -{ - FLAC__Metadata_Chain *chain; - FLAC__StreamMetadata *block = NULL; - const char *error; - - if(0 != (error = store_to_file_pre_(filename, &chain, &block))) - return error; - - if(0 != (error = grabbag__replaygain_store_to_vorbiscomment(block, album_gain, album_peak, title_gain, title_peak))) { - FLAC__metadata_chain_delete(chain); - return error; - } - - if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) - return error; - - return 0; -} - -const char *grabbag__replaygain_store_to_file_reference(const char *filename, FLAC__bool preserve_modtime) -{ - FLAC__Metadata_Chain *chain; - FLAC__StreamMetadata *block = NULL; - const char *error; - - if(0 != (error = store_to_file_pre_(filename, &chain, &block))) - return error; - - if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_reference(block))) { - FLAC__metadata_chain_delete(chain); - return error; - } - - if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) - return error; - - return 0; -} - -const char *grabbag__replaygain_store_to_file_album(const char *filename, float album_gain, float album_peak, FLAC__bool preserve_modtime) -{ - FLAC__Metadata_Chain *chain; - FLAC__StreamMetadata *block = NULL; - const char *error; - - if(0 != (error = store_to_file_pre_(filename, &chain, &block))) - return error; - - if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_album(block, album_gain, album_peak))) { - FLAC__metadata_chain_delete(chain); - return error; - } - - if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) - return error; - - return 0; -} - -const char *grabbag__replaygain_store_to_file_title(const char *filename, float title_gain, float title_peak, FLAC__bool preserve_modtime) -{ - FLAC__Metadata_Chain *chain; - FLAC__StreamMetadata *block = NULL; - const char *error; - - if(0 != (error = store_to_file_pre_(filename, &chain, &block))) - return error; - - if(0 != (error = grabbag__replaygain_store_to_vorbiscomment_title(block, title_gain, title_peak))) { - FLAC__metadata_chain_delete(chain); - return error; - } - - if(0 != (error = store_to_file_post_(filename, chain, preserve_modtime))) - return error; - - return 0; -} - -static FLAC__bool parse_double_(const FLAC__StreamMetadata_VorbisComment_Entry *entry, double *val) -{ - char s[32], *end; - const char *p, *q; - double v; - - FLAC__ASSERT(0 != entry); - FLAC__ASSERT(0 != val); - - p = (const char *)entry->entry; - q = strchr(p, '='); - if(0 == q) - return false; - q++; - safe_strncpy(s, q, local_min(sizeof(s), (size_t) (entry->length - (q-p)))); - - v = strtod(s, &end); - if(end == s) - return false; - - *val = v; - return true; -} - -FLAC__bool grabbag__replaygain_load_from_vorbiscomment(const FLAC__StreamMetadata *block, FLAC__bool album_mode, FLAC__bool strict, double *reference, double *gain, double *peak) -{ - int reference_offset, gain_offset, peak_offset; - char *saved_locale; - FLAC__bool res = true; - - FLAC__ASSERT(0 != block); - FLAC__ASSERT(0 != reference); - FLAC__ASSERT(0 != gain); - FLAC__ASSERT(0 != peak); - FLAC__ASSERT(block->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); - - /* Default to current level until overridden by a detected tag; this - * will always be true until we change replaygain_analysis.c - */ - *reference = ReplayGainReferenceLoudness; - - /* - * We need to save the old locale and switch to "C" because the locale - * influences the behaviour of strtod and we want it a certain way. - */ - saved_locale = strdup(setlocale(LC_ALL, 0)); - if (0 == saved_locale) - return false; - setlocale(LC_ALL, "C"); - - if(0 <= (reference_offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, /*offset=*/0, (const char *)GRABBAG__REPLAYGAIN_TAG_REFERENCE_LOUDNESS))) - (void)parse_double_(block->data.vorbis_comment.comments + reference_offset, reference); - - 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)))) - res = false; - 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)))) - res = false; - - if(res && !parse_double_(block->data.vorbis_comment.comments + gain_offset, gain)) - res = false; - if(res && !parse_double_(block->data.vorbis_comment.comments + peak_offset, peak)) - res = false; - - setlocale(LC_ALL, saved_locale); - free(saved_locale); - - /* something failed; retry with strict */ - if (!res && !strict) - res = grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak); - - return res; -} - -double grabbag__replaygain_compute_scale_factor(double peak, double gain, double preamp, FLAC__bool prevent_clipping) -{ - double scale; - FLAC__ASSERT(peak >= 0.0); - gain += preamp; - scale = (float) pow(10.0, gain * 0.05); - if(prevent_clipping && peak > 0.0) { - const double max_scale = (float)(1.0 / peak); - if(scale > max_scale) - scale = max_scale; - } - return scale; -} |