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| author | Paul B Mahol <onemda@gmail.com> | 2023-01-30 19:35:36 +0100 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2023-01-31 18:45:22 +0100 |
| commit | fc9a3b584da3cf3fc1f00036be2eaf5dff903ccf (patch) | |
| tree | 01bb8684f561dc1af1ac21caff7859c056f0ceff | |
| parent | 00994e8be185d259fbb8346f45f09bcea4e7f750 (diff) | |
| download | ffmpeg-fc9a3b584da3cf3fc1f00036be2eaf5dff903ccf.tar.gz | |
avcodec/mlpdec: parse and use substream info bits
| -rw-r--r-- | libavcodec/mlp_parse.c | 6 | ||||
| -rw-r--r-- | libavcodec/mlp_parse.h | 3 | ||||
| -rw-r--r-- | libavcodec/mlpdec.c | 15 |
3 files changed, 22 insertions, 2 deletions
diff --git a/libavcodec/mlp_parse.c b/libavcodec/mlp_parse.c index 45715352c2..924c731439 100644 --- a/libavcodec/mlp_parse.c +++ b/libavcodec/mlp_parse.c @@ -159,7 +159,11 @@ int ff_mlp_read_major_sync(void *log, MLPHeaderInfo *mh, GetBitContext *gb) mh->num_substreams = get_bits(gb, 4); - skip_bits_long(gb, 4 + (header_size - 17) * 8); + skip_bits(gb, 2); + mh->extended_substream_info = get_bits(gb, 2); + mh->substream_info = get_bits(gb, 8); + + skip_bits_long(gb, (header_size - 18) * 8); return 0; } diff --git a/libavcodec/mlp_parse.h b/libavcodec/mlp_parse.h index f0d7b41c11..fa6e3d52dc 100644 --- a/libavcodec/mlp_parse.h +++ b/libavcodec/mlp_parse.h @@ -58,6 +58,9 @@ typedef struct MLPHeaderInfo int peak_bitrate; ///< Peak bitrate for VBR, actual bitrate (==peak) for CBR int num_substreams; ///< Number of substreams within stream + + int extended_substream_info; ///< Which substream of substreams carry 16-channel presentation + int substream_info; ///< Which substream of substreams carry 2/6/8-channel presentation } MLPHeaderInfo; static const uint8_t thd_chancount[13] = { diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c index 5b14a3b03b..0ee1f0982c 100644 --- a/libavcodec/mlpdec.c +++ b/libavcodec/mlpdec.c @@ -153,6 +153,12 @@ typedef struct MLPDecodeContext { /// Number of substreams contained within this stream. uint8_t num_substreams; + /// Which substream of substreams carry 16-channel presentation + uint8_t extended_substream_info; + + /// Which substream of substreams carry 2/6/8-channel presentation + uint8_t substream_info; + /// Index of the last substream to decode - further substreams are skipped. uint8_t max_decoded_substream; @@ -384,6 +390,7 @@ 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->substream_info = mh.substream_info; /* 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); @@ -1286,7 +1293,13 @@ static int read_access_unit(AVCodecContext *avctx, AVFrame *frame, if (!s->restart_seen) goto next_substr; - if (substr > 0 && substr < m->max_decoded_substream && + if (((avctx->ch_layout.nb_channels == 6 && + ((m->substream_info >> 2) & 0x3) != 0x3) || + (avctx->ch_layout.nb_channels == 8 && + ((m->substream_info >> 4) & 0x7) != 0x7 && + ((m->substream_info >> 4) & 0x7) != 0x6 && + ((m->substream_info >> 4) & 0x7) != 0x3)) && + substr > 0 && substr < m->max_decoded_substream && (s->min_channel <= m->substream[substr - 1].max_channel)) { av_log(avctx, AV_LOG_DEBUG, "Previous substream(%d) channels overlaps current substream(%d) channels, skipping.\n", |