generic-library/ffmpeg
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mlp: improve request_channel_layout behavior.

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Don't decode further substreams if request_channel_layout
is a subset of the current substream's channel_layout.

Before, we would only discard further substreams if
request_channel_layout matched the substream's
channel_layout extactly, thus decoding additional
channels which the caller would probably end up downmixing.
This commit is contained in:
Tim Walker 2014-02-06 21:50:38 +00:00
parent 5c1c6e8226
commit c0c45188e5
2 changed files with 5 additions and 4 deletions
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5
libavcodec/mlp_parser.c
View File

@ -362,8 +362,9 @@ FF_ENABLE_DEPRECATION_WARNINGS
mh.num_substreams > 1) {
avctx->channels = 2;
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
} else if (avctx->request_channel_layout == mh.channel_layout_thd_stream1 ||
!mh.channels_thd_stream2) {
} else if (!mh.channels_thd_stream2 ||
(mh.channel_layout_thd_stream1 & avctx->request_channel_layout) ==
avctx->request_channel_layout) {
avctx->channels = mh.channels_thd_stream1;
avctx->channel_layout = mh.channel_layout_thd_stream1;
} else {

4
libavcodec/mlpdec.c
View File

@ -504,8 +504,8 @@ FF_DISABLE_DEPRECATION_WARNINGS
} else
FF_ENABLE_DEPRECATION_WARNINGS
#endif
if (m->avctx->request_channel_layout == s->ch_layout &&
m->max_decoded_substream > substr) {
if ((s->ch_layout & m->avctx->request_channel_layout) ==
m->avctx->request_channel_layout && m->max_decoded_substream > substr) {
av_log(m->avctx, AV_LOG_DEBUG,
"Extracting %d-channel downmix (0x%"PRIx64") from substream %d. "
"Further substreams will be skipped.\n",