avauddec: fix unnecessary reconfiguration if the audio layout isn't specified

It would constantly want to renegotiate (and spam the debug log) even
though the channel layout hasn't actually changed. We use the same
fallback in gst_ffmpegauddec_negotiate() already.

This happens with WMA files for example.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3103>

diff --git a/subprojects/gst-libav/ext/libav/gstavauddec.c b/subprojects/gst-libav/ext/libav/gstavauddec.c
index 4bdb197..68ab1dc 100644 (file)
--- a/subprojects/gst-libav/ext/libav/gstavauddec.c
+++ b/subprojects/gst-libav/ext/libav/gstavauddec.c
@@ -358,6 +358,9 @@ settings_changed (GstFFMpegAudDec * ffmpegdec, AVFrame * frame)
   GstAudioLayout layout;
   gint channels = av_get_channel_layout_nb_channels (frame->channel_layout);
 
+  if (channels == 0)
+    channels = frame->channels;
+
   format = gst_ffmpeg_smpfmt_to_audioformat (frame->format, &layout);
   if (format == GST_AUDIO_FORMAT_UNKNOWN)
     return TRUE;