Commit a49aa440 authored by Alessandro Ghedini's avatar Alessandro Ghedini Committed by Anton Khirnov
Browse files

af_volume: implement replaygain pre-amplification



This adds a new "replaygain_preamp" option to the filter, and simply adds its
value to the replaygain gain value.
Signed-off-by: default avatarAnton Khirnov <anton@khirnov.net>
parent c74b8669
......@@ -633,6 +633,12 @@ Prefer track gain, if present.
@item album
Prefer album gain, if present.
@end table
@item replaygain_preamp
Pre-amplification gain in dB to apply to the selected replaygain gain.
Default value for @var{replaygain_preamp} is 0.0.
@end table
@subsection Examples
......
......@@ -59,6 +59,8 @@ static const AVOption options[] = {
{ "ignore", "replaygain side data is ignored", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_IGNORE }, 0, 0, A, "replaygain" },
{ "track", "track gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_TRACK }, 0, 0, A, "replaygain" },
{ "album", "album gain is preferred", 0, AV_OPT_TYPE_CONST, { .i64 = REPLAYGAIN_ALBUM }, 0, 0, A, "replaygain" },
{ "replaygain_preamp", "Apply replaygain pre-amplification",
OFFSET(replaygain_preamp), AV_OPT_TYPE_DOUBLE, { .dbl = 0.0 }, -15.0, 15.0, A },
{ NULL },
};
......@@ -262,7 +264,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
av_log(inlink->dst, AV_LOG_VERBOSE,
"Using gain %f dB from replaygain side data.\n", g);
vol->volume = pow(10, g / 20);
vol->volume = pow(10, (g + vol->replaygain_preamp) / 20);
vol->volume_i = (int)(vol->volume * 256 + 0.5);
volume_init(vol);
......
......@@ -47,6 +47,7 @@ typedef struct VolumeContext {
AVFloatDSPContext fdsp;
enum PrecisionType precision;
enum ReplayGainType replaygain;
double replaygain_preamp;
double volume;
int volume_i;
int channels;
......
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