[Bug 751605] New: audio: Add proper support for non-interleaved / planar audio

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751605

            Bug ID: 751605
           Summary: audio: Add proper support for non-interleaved / planar
                    audio
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: slomo at coaxion.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: ensonic at sonicpulse.de
            Blocks: 705986
     GNOME version: ---

This is related to bug #705986. Currently we have a field in the caps for that,
however that's not enough.

Similar to planar video formats, there can be alignment constraints for each
"plane" / channel. So that for each channel you e.g. allocate
GST_ROUND_UP_16(samples*bpf).


This sounds like we need to add a GstAudioNonInterleavedMeta. This should
contain an array of channel offsets at least and the number of samples in this
buffer. Which should be enough to support the two relevant cases: 1) one big
memory with channels at some offset in there, 2) one memory per channel,
according to the buffer each channel directly coming after the previous but
actually in different memory areas.


In theory we could go without the meta by always doing things like in case 2),
and if necessary wrapping multiple GstMemory around a single memory area.
However that would be less efficient.



If the meta is not available, we should assume that one channel comes directly
after the other without any padding/alignment.



Any comments, ideas, ...?

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