[Bug 725078] audiobasesink: clip start samples to match clipped timestamp from skew algorithm

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725078
  GStreamer | gst-plugins-base | git

--- Comment #7 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2014-11-12 13:40:02 UTC ---
Sorry to ping again on this one, but the patch seems obviously correct to me,
so I'll try to explain it with an example.

Imagine you get a buffer with ts 3, duration 2, and 200 samples. That makes 100
samples per second, starting at 3 and ending at 5.

Imagine now that the skew algorithm offsets the timestamps by -3.5: the start
value goes from 3 to -0.5, end to 1.5. The start value will get clipped to 0,
so the buffer will start at 0 and have duration 1.5.

Those samples corresponding to the -0.5 - 0 interval now need to be dropped in
order for the samples in positive time to play at the correct time. So dropping
the first 50 samples gives us a buffer with the last 150 samples, starting at
0, and ending at 1.5.

Does this convince you ?

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