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replaygain: allow exporting already decoded replaygain values 

This adds a function to export raw replaygain values (i.e. in the (u)int32_t
form). It first checks whether AV_PKT_DATA_REPLAYGAIN side data is present, in
which case it does nothing.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Alessandro Ghedini 2014-04-12 18:25:40 +02:00 committed by Anton Khirnov
parent 21d8f4da91
commit ae43c10e36
2 changed files with 21 additions and 15 deletions
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29
libavformat/replaygain.c
View File

@ -66,23 +66,22 @@ static int32_t parse_value(const char *value, int32_t min)
return db * 100000 + sign * mb;
}
static int replaygain_export(AVStream *st,
const uint8_t *track_gain, const uint8_t *track_peak,
const uint8_t *album_gain, const uint8_t *album_peak)
int ff_replaygain_export_raw(AVStream *st, int32_t tg, uint32_t tp,
int32_t ag, uint32_t ap)
{
AVPacketSideData *sd, *tmp;
AVReplayGain *replaygain;
int32_t tg, ag;
uint32_t tp, ap;
tg = parse_value(track_gain, INT32_MIN);
ag = parse_value(album_gain, INT32_MIN);
tp = parse_value(track_peak, 0);
ap = parse_value(album_peak, 0);
if (tg == INT32_MIN && ag == INT32_MIN)
return 0;
for (int i = 0; i < st->nb_side_data; i++) {
AVPacketSideData *src_sd = &st->side_data[i];
if (src_sd->type == AV_PKT_DATA_REPLAYGAIN)
return 0;
}
replaygain = av_mallocz(sizeof(*replaygain));
if (!replaygain)
return AVERROR(ENOMEM);
@ -117,9 +116,9 @@ int ff_replaygain_export(AVStream *st, AVDictionary *metadata)
ag = av_dict_get(metadata, "REPLAYGAIN_ALBUM_GAIN", NULL, 0);
ap = av_dict_get(metadata, "REPLAYGAIN_ALBUM_PEAK", NULL, 0);
return replaygain_export(st,
tg ? tg->value : NULL,
tp ? tp->value : NULL,
ag ? ag->value : NULL,
ap ? ap->value : NULL);
return ff_replaygain_export_raw(st,
parse_value(tg ? tg->value : NULL, INT32_MIN),
parse_value(tp ? tp->value : NULL, 0),
parse_value(ag ? ag->value : NULL, INT32_MIN),
parse_value(ap ? ap->value : NULL, 0));
}

7
libavformat/replaygain.h
View File

@ -28,4 +28,11 @@
*/
int ff_replaygain_export(AVStream *st, AVDictionary *metadata);
/**
* Export already decoded replaygain values as per-stream side data.
*/
int ff_replaygain_export_raw(AVStream *st, int32_t tg, uint32_t tp,
int32_t ag, uint32_t ap);
#endif /* AVFORMAT_REPLAYGAIN_H */