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mlpdec: support TrueHD streams with an Atmos substream 

The fourth substream is being discarded, since its not raw audio data,
but an encoded Atmos stream which needs a specialized decoder.

Fixes decoding of the true hd stream from Transformers\ -\ Age\ of\ Extinction\ 2014\ 1080P-003.mkv

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Hendrik Leppkes 2014-09-26 13:49:21 +02:00 committed by Anton Khirnov
parent f36f6a608b
commit dc2d0e06af
2 changed files with 4 additions and 2 deletions
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2
libavcodec/mlp.h
View File

@ -45,7 +45,7 @@
/** Maximum number of substreams that can be decoded.
* MLP's limit is 2. TrueHD supports at least up to 3.
*/
#define MAX_SUBSTREAMS 3
#define MAX_SUBSTREAMS 4
/** which multiple of 48000 the maximum sample rate is */
#define MAX_RATEFACTOR 4

4
libavcodec/mlpdec.c
View File

@ -355,7 +355,9 @@ static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
m->access_unit_size_pow2 = mh.access_unit_size_pow2;
m->num_substreams = mh.num_substreams;
m->max_decoded_substream = m->num_substreams - 1;
/* limit to decoding 3 substreams, as the 4th is used by Dolby Atmos for non-audio data */
m->max_decoded_substream = FFMIN(m->num_substreams - 1, 2);
m->avctx->sample_rate = mh.group1_samplerate;
m->avctx->frame_size = mh.access_unit_size;