avauddec: Read channels from the channels field

If there is no layout, just read the channel count from the
channels field.

https://bugzilla.gnome.org/show_bug.cgi?id=752186

diff --git a/ext/libav/gstavauddec.c b/ext/libav/gstavauddec.c
index 360d168..17eb773 100644 (file)
--- a/ext/libav/gstavauddec.c
+++ b/ext/libav/gstavauddec.c
@@ -381,6 +381,8 @@ gst_ffmpegauddec_negotiate (GstFFMpegAudDec * ffmpegdec,
   channels =
       av_get_channel_layout_nb_channels (av_frame_get_channel_layout (frame));
   if (channels == 0)
+    channels = av_frame_get_channels (frame);
+  if (channels == 0)
     goto no_caps;
 
   if (!force && !settings_changed (ffmpegdec, frame))