[Bug 690267] New: interleave: negotiation failure on sinkpads when channel-mask is specified

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=690267
  GStreamer | gst-plugins-good | git

           Summary: interleave: negotiation failure on sinkpads when
                    channel-mask is specified
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: phil at base-art.net
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


GST_DEBUG=interleave:4,wavparse:3 gst-launch-1.0 interleave name=i !
audioconvert ! wavenc ! filesink location=file.wav  filesrc location=mono.wav !
decodebin  ! "audio/x-raw, channels=(int)1, rate=(int)44100,
layout=(string)interleaved, format=(string)F32LE,
channel-mask=(bitmask)0x0000000000000001" ! audioconvert ! queue ! i.   filesrc
location=mono.wav ! decodebin ! "audio/x-raw, channels=(int)1, rate=(int)44100,
layout=(string)interleaved, format=(string)F32LE,
channel-mask=(bitmask)0x0000000000000002" ! audioconvert ! queue ! i.

0:00:00.063537894 32410  0x9aabf80 WARN              interleave
interleave.c:290:gst_interleave_set_channel_positions:<i> Invalid channel
positions, using NONE
0:00:00.065703846 32410  0x9bcb320 WARN                wavparse
gstwavparse.c:2386:gst_wavparse_loop:<wavparse1> error: Internal data flow
error.
0:00:00.065723740 32410  0x9bcb320 WARN                wavparse
gstwavparse.c:2386:gst_wavparse_loop:<wavparse1> error: streaming task paused,
reason not-negotiated (-4)

I think this is because interleave sets its src pad caps once only when it
receives the CAPS event. In this case it attempts to set caps for a stereo
stream with pos[0]=0x0000000000000001 and pos[1]=NONE and fails.

I wonder if we should set the src pad caps when we receive the last CAPS event
instead.

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