[Bug 757033] scaletempo: Does not work properly with negative rates playback

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757033

--- Comment #4 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 314019
  --> https://bugzilla.gnome.org/attachment.cgi?id=314019&action=edit
scaletempo: Fix handling of rate < 0

We have to reverse all samples in a buffer before processing them to properly
have continuous data from one buffer to another. As a result we will have a
negative applied rate and a rate of 1.0.

Also copy over the segment event's sequence number to the output segment while
we're at it.

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