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Use C locale when reading ReplayGain tag 

When a locale is in effect that does not use the point as the decimal
mark (e.g., sv_SE or de_DE, which use a comma) and a ReplayGain tag is
read for --apply-replaygain-which-is-not-lossless, the gain value was
misinterpreted (e.g., "-2.29" truncated to "-2"). This is fixed by
resetting the locale to "C" temporarily, based on Josh Coalson's fix
of the dual case (writing ReplayGain tag) in commit cda02d3.

Patch by hhaamu@gmail.com, taken from the Debian patch tracker for
flac 1.2.1-6 (13_replaygain_c_locale.patch).

http://sourceforge.net/p/flac/bugs/380/

Signed-off-by: Erik de Castro Lopo <erikd@mega-nerd.com>
This commit is contained in:
Ulrich Klauer 2013-04-11 22:07:49 +02:00 committed by Erik de Castro Lopo
parent c1ebd2caa4
commit aa285f3ac1
1 changed files with 25 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
src/share/grabbag/replaygain.c
View File

@ -606,6 +606,8 @@ static FLAC__bool parse_double_(const FLAC__StreamMetadata_VorbisComment_Entry *
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);
@ -618,20 +620,36 @@ FLAC__bool grabbag__replaygain_load_from_vorbiscomment(const FLAC__StreamMetadat
*/
*reference = ReplayGainReferenceLoudness;
/*
* 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");
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))))
return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
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))))
return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
res = false;
if(!parse_double_(block->data.vorbis_comment.comments + gain_offset, gain))
return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
if(!parse_double_(block->data.vorbis_comment.comments + peak_offset, peak))
return !strict && grabbag__replaygain_load_from_vorbiscomment(block, !album_mode, /*strict=*/true, reference, gain, peak);
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;
return true;
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)