[FFmpeg-cvslog] mlp_parser: account for AVCodecContext. request_channels when setting the channel layout.

[Tim Walker]

ffmpeg | branch: master | Tim Walker <tdskywalker at gmail.com> | Mon Dec 31 15:33:26 2012 +0100| [b0c7e3ffd09f68022429920da483ad7abed84aa1] | committer: Justin Ruggles

mlp_parser: account for AVCodecContext.request_channels when setting the channel layout.

Allows users to configure the output based on what's actually decoded, rather than the full native layout.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b0c7e3ffd09f68022429920da483ad7abed84aa1
---

 libavcodec/mlp_parser.c |   18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/libavcodec/mlp_parser.c b/libavcodec/mlp_parser.c
index 31c79c9..8c57840 100644
--- a/libavcodec/mlp_parser.c
+++ b/libavcodec/mlp_parser.c
@@ -322,11 +322,23 @@ static int mlp_parse(AVCodecParserContext *s,
 
         if (mh.stream_type == 0xbb) {
             /* MLP stream */
-            avctx->channels       = mh.channels_mlp;
-            avctx->channel_layout = mh.channel_layout_mlp;
+            if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
+                mh.num_substreams > 1) {
+                avctx->channels       = 2;
+                avctx->channel_layout = AV_CH_LAYOUT_STEREO;
+            } else {
+                avctx->channels       = mh.channels_mlp;
+                avctx->channel_layout = mh.channel_layout_mlp;
+            }
         } else { /* mh.stream_type == 0xba */
             /* TrueHD stream */
-            if (mh.channels_thd_stream2) {
+            if (avctx->request_channels > 0 && avctx->request_channels <= 2 &&
+                mh.num_substreams > 1) {
+                avctx->channels       = 2;
+                avctx->channel_layout = AV_CH_LAYOUT_STEREO;
+            } else if (mh.channels_thd_stream2 &&
+                       (avctx->request_channels <= 0 ||
+                        avctx->request_channels > mh.channels_thd_stream1)) {
                 avctx->channels       = mh.channels_thd_stream2;
                 avctx->channel_layout = mh.channel_layout_thd_stream2;
             } else {