generic-library/ffmpeg
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mlp: store the channel layout for each substream.

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Also stop storing the channel arrangement in the header info, as it's unused outside of ff_mlp_read_major_sync.

Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>

CC:libav-stable@libav.org
This commit is contained in:
Tim Walker 2012-12-31 15:33:23 +01:00 committed by Justin Ruggles
parent 73b704ac60
commit 99ccd2ba10
3 changed files with 43 additions and 13 deletions
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26
libavcodec/mlp_parser.c
View File

@ -126,7 +126,7 @@ static uint64_t truehd_layout(int chanmap)
int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
{
int ratebits;
int ratebits, channel_arrangement;
uint16_t checksum;
assert(get_bits_count(gb) == 0);
@ -157,7 +157,9 @@ int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
skip_bits(gb, 11);
mh->channels_mlp = get_bits(gb, 5);
channel_arrangement = get_bits(gb, 5);
mh->channels_mlp = mlp_channels[channel_arrangement];
mh->channel_layout_mlp = mlp_layout[channel_arrangement];
} else if (mh->stream_type == 0xba) {
mh->group1_bits = 24; // TODO: Is this information actually conveyed anywhere?
mh->group2_bits = 0;
@ -168,11 +170,15 @@ int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb)
skip_bits(gb, 8);
mh->channels_thd_stream1 = get_bits(gb, 5);
channel_arrangement = get_bits(gb, 5);
mh->channels_thd_stream1 = truehd_channels(channel_arrangement);
mh->channel_layout_thd_stream1 = truehd_layout(channel_arrangement);
skip_bits(gb, 2);
mh->channels_thd_stream2 = get_bits(gb, 13);
channel_arrangement = get_bits(gb, 13);
mh->channels_thd_stream2 = truehd_channels(channel_arrangement);
mh->channel_layout_thd_stream2 = truehd_layout(channel_arrangement);
} else
return AVERROR_INVALIDDATA;
@ -316,16 +322,16 @@ static int mlp_parse(AVCodecParserContext *s,
if (mh.stream_type == 0xbb) {
/* MLP stream */
avctx->channels = mlp_channels[mh.channels_mlp];
avctx->channel_layout = mlp_layout[mh.channels_mlp];
avctx->channels = mh.channels_mlp;
avctx->channel_layout = mh.channel_layout_mlp;
} else { /* mh.stream_type == 0xba */
/* TrueHD stream */
if (mh.channels_thd_stream2) {
avctx->channels = truehd_channels(mh.channels_thd_stream2);
avctx->channel_layout = truehd_layout(mh.channels_thd_stream2);
avctx->channels = mh.channels_thd_stream2;
avctx->channel_layout = mh.channel_layout_thd_stream2;
} else {
avctx->channels = truehd_channels(mh.channels_thd_stream1);
avctx->channel_layout = truehd_layout(mh.channels_thd_stream1);
avctx->channels = mh.channels_thd_stream1;
avctx->channel_layout = mh.channel_layout_thd_stream1;
}
}

9
libavcodec/mlp_parser.h
View File

@ -39,9 +39,12 @@ typedef struct MLPHeaderInfo
int group1_samplerate; ///< Sample rate of first substream
int group2_samplerate; ///< Sample rate of second substream (MLP only)
int channels_mlp; ///< Channel arrangement for MLP streams
int channels_thd_stream1; ///< Channel arrangement for substream 1 of TrueHD streams (5.1)
int channels_thd_stream2; ///< Channel arrangement for substream 2 of TrueHD streams (7.1)
int channels_mlp; ///< Channel count for MLP streams
int channels_thd_stream1; ///< Channel count for substream 1 of TrueHD streams ("6-channel presentation")
int channels_thd_stream2; ///< Channel count for substream 2 of TrueHD streams ("8-channel presentation")
uint64_t channel_layout_mlp; ///< Channel layout for MLP streams
uint64_t channel_layout_thd_stream1; ///< Channel layout for substream 1 of TrueHD streams ("6-channel presentation")
uint64_t channel_layout_thd_stream2; ///< Channel layout for substream 2 of TrueHD streams ("8-channel presentation")
int access_unit_size; ///< Number of samples per coded frame
int access_unit_size_pow2; ///< Next power of two above number of samples per frame

21
libavcodec/mlpdec.c
View File

@ -28,6 +28,7 @@
#include "avcodec.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/channel_layout.h"
#include "get_bits.h"
#include "internal.h"
#include "libavutil/crc.h"
@ -56,6 +57,8 @@ typedef struct SubStream {
uint8_t max_matrix_channel;
/// For each channel output by the matrix, the output channel to map it to
uint8_t ch_assign[MAX_CHANNELS];
/// The channel layout for this substream
uint64_t ch_layout;
/// Channel coding parameters for channels in the substream
ChannelParams channel_params[MAX_CHANNELS];
@ -325,6 +328,24 @@ static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
for (substr = 0; substr < MAX_SUBSTREAMS; substr++)
m->substream[substr].restart_seen = 0;
/* Set the layout for each substream. When there's more than one, the first
* substream is Stereo. Subsequent substreams' layouts are indicated in the
* major sync. */
if (m->avctx->codec_id == AV_CODEC_ID_MLP) {
if ((substr = (mh.num_substreams > 1)))
m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO;
m->substream[substr].ch_layout = mh.channel_layout_mlp;
} else {
if ((substr = (mh.num_substreams > 1)))
m->substream[0].ch_layout = AV_CH_LAYOUT_STEREO;
if (mh.num_substreams > 2)
if (mh.channel_layout_thd_stream2)
m->substream[2].ch_layout = mh.channel_layout_thd_stream2;
else
m->substream[2].ch_layout = mh.channel_layout_thd_stream1;
m->substream[substr].ch_layout = mh.channel_layout_thd_stream1;
}
return 0;
}