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Merge commit '23d461fe8714a20ee5e6929f22c61512fdda568e'

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* commit '23d461fe8714a20ee5e6929f22c61512fdda568e':
  ac3dec: Allow asymmetric application of DRC when drc_scale > 1

Conflicts:
	libavcodec/ac3dec.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-01-30 14:55:03 +01:00
commit 3c7195a969
1 changed files with 8 additions and 3 deletions
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11
libavcodec/ac3dec.c
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@ -782,8 +782,13 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
i = !s->channel_mode;
do {
if (get_bits1(gbc)) {
s->dynamic_range[i] = powf(dynamic_range_tab[get_bits(gbc, 8)],
s->drc_scale);
/* Allow asymmetric application of DRC when drc_scale > 1.
Amplification of quiet sounds is enhanced */
float range = dynamic_range_tab[get_bits(gbc, 8)];
if (range > 1.0 || s->drc_scale <= 1.0)
s->dynamic_range[i] = powf(range, s->drc_scale);
else
s->dynamic_range[i] = range;
} else if (blk == 0) {
s->dynamic_range[i] = 1.0f;
}
@ -1504,7 +1509,7 @@ static av_cold int ac3_decode_end(AVCodecContext *avctx)
#define OFFSET(x) offsetof(AC3DecodeContext, x)
#define PAR (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_AUDIO_PARAM)
static const AVOption options[] = {
{ "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 1.0, PAR },
{ "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },
{"dmix_mode", "Preferred Stereo Downmix Mode", OFFSET(preferred_stereo_downmix), AV_OPT_TYPE_INT, {.i64 = -1 }, -1, 2, 0, "dmix_mode"},
{"ltrt_cmixlev", "Lt/Rt Center Mix Level", OFFSET(ltrt_center_mix_level), AV_OPT_TYPE_FLOAT, {.dbl = -1.0 }, -1.0, 2.0, 0},