[Bug 779023] New: audio-channel-mixer/audioconvert: 6 channel ac3 audio incorrectly converted to 6 channel output

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779023

            Bug ID: 779023
           Summary: audio-channel-mixer/audioconvert: 6 channel ac3 audio
                    incorrectly converted to 6 channel output
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: abhimanyu.v at imgtec.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 346325
  --> https://bugzilla.gnome.org/attachment.cgi?id=346325&action=edit
audio file

When playing ac3 file with 6 channel, it produces audio with bitmask=0xc0f and
when audioconvert is used which output 6 channel with bitmask=0x3f mixes the
channels to produce incorrect audio output.

gst-launch-1.0 filesrc location=5.1_alldiff.ac3 ! ac3parse ! avdec_ac3 !
audioconvert ! capsfilter caps="audio/x-raw, layout=(string)interleaved,
rate=(int)44100, format=(string)S32LE, channels=(int)6,
channel-mask=(bitmask)0x000000000000003f" ! deinterleave name=d d.src_0 !
alsasink -v

The above command output is mix of 2 channel instead of single channel output.

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