[Bug 757043] audioresample and other audio filters with history: Does not work properly with negative rates playback

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757043

--- Comment #1 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
A patch for the same problem in scaletempo is in the linked bug. We'll have to
do more or less the same for other elements. So need
- a function to reverse audio samples in a buffer
- adjust the segment, which basetransform does not really support right now
(different input than output segment)
- adjust the timestamps of buffers

We can probably implement that in GstAudioFilter behind a flag, but
audioresample and audioconvert are not using GstAudioFilter for example.

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