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avcodec/mlpdec: relax channels checking

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Internal TrueHD decoder channel rematrix can mix 2 stereo substreams
into single mono stream.

Fixes #1726
This commit is contained in:
Paul B Mahol 2022-09-17 14:08:58 +02:00
parent ed83a3a5bd
commit adaa06581c
1 changed files with 1 additions and 22 deletions
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23
libavcodec/mlpdec.c
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@ -425,6 +425,7 @@ static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
mh.stream_type);
return AVERROR_PATCHWELCOME;
}
m->substream[1].mask = mh.channel_layout_thd_stream1;
if (mh.channels_thd_stream1 == 2 &&
mh.channels_thd_stream2 == 2 &&
m->avctx->ch_layout.nb_channels == 2)
@ -438,16 +439,6 @@ static int read_major_sync(MLPDecodeContext *m, GetBitContext *gb)
m->substream[2].mask = mh.channel_layout_thd_stream1;
if (m->avctx->ch_layout.nb_channels > 2)
m->substream[mh.num_substreams > 1].mask = mh.channel_layout_thd_stream1;
if (m->avctx->ch_layout.nb_channels <= 2 &&
m->substream[substr].mask == AV_CH_LAYOUT_MONO && m->max_decoded_substream == 1) {
av_log(m->avctx, AV_LOG_DEBUG, "Mono stream with 2 substreams, ignoring 2nd\n");
m->max_decoded_substream = 0;
if (m->avctx->ch_layout.nb_channels == 2) {
av_channel_layout_uninit(&m->avctx->ch_layout);
m->avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
}
}
}
m->needs_reordering = mh.channel_arrangement >= 18 && mh.channel_arrangement <= 20;
@ -541,12 +532,6 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
return AVERROR_INVALIDDATA;
}
if (max_channel != max_matrix_channel) {
av_log(m->avctx, AV_LOG_ERROR,
"Max channel must be equal max matrix channel.\n");
return AVERROR_INVALIDDATA;
}
/* This should happen for TrueHD streams with >6 channels and MLP's noise
* type. It is not yet known if this is allowed. */
if (max_channel > MAX_MATRIX_CHANNEL_MLP && !noise_type) {
@ -557,12 +542,6 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp,
return AVERROR_PATCHWELCOME;
}
if (min_channel > max_channel) {
av_log(m->avctx, AV_LOG_ERROR,
"Substream min channel cannot be greater than max channel.\n");
return AVERROR_INVALIDDATA;
}
s->min_channel = min_channel;
s->max_channel = max_channel;
s->coded_channels = ((1LL << (max_channel - min_channel + 1)) - 1) << min_channel;