[Bug 763308] ahcsrc: failed to run repeated playing and paused actions

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=763308

--- Comment #5 from Justin J. Kim <justin.joy.9to5 at gmail.com> ---
Tbh, the purpose of this patch is somewhat to get advise.

(In reply to Sebastian Dröge (slomo) from comment #4)
> What does that NUM_CALLBACK_BUFFERS mean? Is it the number of buffers we
> allocate, and if all 5 are somehow in use we can't capture anymore? 

It seems to be right. All of allocated buffers are in use even in PAUSED status
and some buffers would be discarded by some reasons (not yet analysed).

http://developer.android.com/reference/android/hardware/Camera.html#addCallbackBuffer(byte[])

> In that case it seems more like something for the maximum latency value.

In my testing on my two devices (Nexus 5x and LG V410), maximum latency value
has no effect.

> For the minimum we should somehow get the maximum time that is taken from
> timestamping the frame to having it inside ahcsrc.

I agree and am trying to get proper values, but it's still vague.

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