[libav-devel] [PATCH 4/5] If AVCodecContext.channels is 0 and AVCodecContext.channel_layout is non-zero, set channels based on channel_layout.

[Justin Ruggles]

This allows the user to set only channel_layout and not channels.
---
 libavcodec/utils.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)


diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index e03a4c9..1f0a0c5 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -584,6 +584,8 @@ int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
                 ret = AVERROR(EINVAL);
                 goto free_and_end;
             }
+        } else if (avctx->channel_layout) {
+            avctx->channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
         }
     }
 

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