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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from George Kiagiadakis <gkiagia at tolabaki.gr> ---
(In reply to Sebastian Dröge (slomo) from comment #5)
> Making the meta mandatory is problematic as various elements can already
> handle non-interleaved audio. Without meta, it has to be tightly packed.

Is that really true? Do they really handle non-interleaved audio? Is it tested?
It seemed to me that they advertise it, but nobody really supports it. For
example, audioresample advertises it, but it actually crashes if you negotiate
it with non-interleaved.

A reason for making it mandatory is that there is API that won't be able to
handle non-interleaved audio otherwise, like gst_audio_buffer_clip() (the
arguments of the function are not sufficient). It is also incredibly convenient
for mapping the audio buffer without having to take cases.

> Also why (multiple) offsets for the meta instead of a single "stride"?

This allows to do zero-copy clipping as well as channel reordering. As long as
every element uses the new gst_audio_buffer_map/unmap() API, clipping or
reordering is just a matter of modifying the offsets and/or the 'samples'
variable.

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