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af_volume: add replaygain support 

This adds the options replaygain-track and replaygain-album. If either is set,
the replaygain track or album gain will be automatically read from the track
metadata and the volume adjusted accordingly.

This only supports reading REPLAYGAIN_(TRACK|ALBUM)_GAIN tags. Other formats
like LAME's info header would probably require support from libav.
This commit is contained in:
Alessandro Ghedini 2014-03-12 11:14:10 +01:00 committed by wm4
parent 04e14ec8f6
commit 3f0139e5db
2 changed files with 28 additions and 0 deletions
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6
DOCS/man/en/af.rst
View File

@ -279,6 +279,12 @@ Available filters are:
Sets the desired gain in dB for all channels in the stream from -200dB
to +60dB, where -200dB mutes the sound completely and +60dB equals a
gain of 1000 (default: 0).
``replaygain-track``
Adjust volume gain according to the track-gain replaygain value stored
in the file metadata. Note that this only supports reading REPLAYGAIN_*
tags, as written by mp3gain, metaflac, etc...
``replaygain-album``
Like replaygain-track, but using the album-gain value instead.
``<softclip>``
Turns soft clipping on. Soft-clipping can make the
sound more smooth if very high volume levels are used. Enable this

22
audio/filter/af_volume.c
View File

@ -28,9 +28,12 @@
#include "common/common.h"
#include "af.h"
#include "demux/demux.h"
struct priv {
float level; // Gain level for each channel
int rgain_track; // Enable/disable track based replaygain
int rgain_album; // Enable/disable album based replaygain
int soft; // Enable/disable soft clipping
int fast; // Use fix-point volume control
float cfg_volume;
@ -54,6 +57,23 @@ static int control(struct af_instance *af, int cmd, void *arg)
}
if (af_fmt_is_planar(in->format))
mp_audio_set_format(af->data, af_fmt_to_planar(af->data->format));
if ((s->rgain_track || s->rgain_album) && af->metadata) {
char *rgain = NULL, *rest;
if (s->rgain_track) {
rgain = mp_tags_get_str(af->metadata, "REPLAYGAIN_TRACK_GAIN");
} else if (s->rgain_album) {
rgain = mp_tags_get_str(af->metadata, "REPLAYGAIN_ALBUM_GAIN");
}
if (rgain) {
float db = strtod(rgain, &rest);
if (rest && (rest != rgain) && isfinite(db))
af_from_dB(1, &db, &s->level, 20.0, -200.0, 60.0);
else
mp_msg(af->log, MSGL_ERR, "Invalid replaygain value\n");
} else {
mp_msg(af->log, MSGL_ERR, "Replaygain tags not found\n");
}
}
return af_test_output(af, in);
}
case AF_CONTROL_SET_VOLUME:
@ -119,6 +139,8 @@ struct af_info af_info_volume = {
.priv_size = sizeof(struct priv),
.options = (const struct m_option[]) {
OPT_FLOATRANGE("volumedb", cfg_volume, 0, -200, 60),
OPT_FLAG("replaygain-track", rgain_track, 0),
OPT_FLAG("replaygain-album", rgain_album, 0),
OPT_FLAG("softclip", soft, 0),
OPT_FLAG("s16", fast, 0),
{0}