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ac3dec: set AV_FRAME_DATA_DOWNMIX_INFO side data.

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This commit is contained in:
Tim Walker 2014-02-15 17:38:15 +00:00
parent c98f3169bf
commit 9cd4bc4176
3 changed files with 39 additions and 2 deletions
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38
libavcodec/ac3dec.c
View File

@ -31,6 +31,7 @@
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/downmix_info.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "aac_ac3_parser.h"
@ -77,6 +78,15 @@ static const float gain_levels[9] = {
LEVEL_MINUS_9DB
};
/** Adjustments in dB gain (LFE, +10 to -21 dB) */
static const float gain_levels_lfe[32] = {
3.162275, 2.818382, 2.511886, 2.238719, 1.995261, 1.778278, 1.584893,
1.412536, 1.258924, 1.122018, 1.000000, 0.891251, 0.794328, 0.707946,
0.630957, 0.562341, 0.501187, 0.446683, 0.398107, 0.354813, 0.316227,
0.281838, 0.251188, 0.223872, 0.199526, 0.177828, 0.158489, 0.141253,
0.125892, 0.112201, 0.100000, 0.089125
};
/**
* Table for default stereo downmixing coefficients
* reference: Section 7.8.2 Downmixing Into Two Channels
@ -1308,6 +1318,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data,
const uint8_t *channel_map;
const float *output[AC3_MAX_CHANNELS];
enum AVMatrixEncoding matrix_encoding;
AVDownmixInfo *downmix_info;
/* copy input buffer to decoder context to avoid reading past the end
of the buffer, which can be caused by a damaged input stream. */
@ -1478,6 +1489,33 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data,
if ((ret = ff_side_data_update_matrix_encoding(frame, matrix_encoding)) < 0)
return ret;
/* AVDownmixInfo */
if ((downmix_info = av_downmix_info_update_side_data(frame))) {
switch (s->preferred_downmix) {
case AC3_DMIXMOD_LTRT:
downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LTRT;
break;
case AC3_DMIXMOD_LORO:
downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_LORO;
break;
case AC3_DMIXMOD_DPLII:
downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_DPLII;
break;
default:
downmix_info->preferred_downmix_type = AV_DOWNMIX_TYPE_UNKNOWN;
break;
}
downmix_info->center_mix_level = gain_levels[s-> center_mix_level];
downmix_info->center_mix_level_ltrt = gain_levels[s-> center_mix_level_ltrt];
downmix_info->surround_mix_level = gain_levels[s-> surround_mix_level];
downmix_info->surround_mix_level_ltrt = gain_levels[s->surround_mix_level_ltrt];
if (s->lfe_mix_level_exists)
downmix_info->lfe_mix_level = gain_levels_lfe[s->lfe_mix_level];
else
downmix_info->lfe_mix_level = 0.0; // -inf dB
} else
return AVERROR(ENOMEM);
*got_frame_ptr = 1;
return FFMIN(buf_size, s->frame_size);

1
libavcodec/eac3dec.c
View File

@ -360,7 +360,6 @@ int ff_eac3_parse_header(AC3DecodeContext *s)
/* lfe mix level */
if (s->lfe_on && (s->lfe_mix_level_exists = get_bits1(gbc))) {
// TODO: use LFE mix level
s->lfe_mix_level = get_bits(gbc, 5);
}

2
libavcodec/version.h
View File

@ -30,7 +30,7 @@
#define LIBAVCODEC_VERSION_MAJOR 55
#define LIBAVCODEC_VERSION_MINOR 34
#define LIBAVCODEC_VERSION_MICRO 0
#define LIBAVCODEC_VERSION_MICRO 1
#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
LIBAVCODEC_VERSION_MINOR, \