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vo_vdpau: add an additional check for timestamp robustness 

This might be a good idea in order to prevent queuing a frame too far in
the future (causing apparent freezing of the video display), or dropping
an infinite number of frames (also apparent as freezing).

I think at this point this is most of what we can do if the vdpau time
source is unreliable (like with Mesa). There are still inherent race
conditions which can't be fixed.
This commit is contained in:
wm4 2014-04-08 20:16:53 +02:00
parent a62276bf56
commit 708f32b746
1 changed files with 16 additions and 0 deletions
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16
video/out/vo_vdpau.c
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@ -1037,6 +1037,22 @@ static void flip_page_timed(struct vo *vo, int64_t pts_us, int duration)
uint64_t ideal_pts = pts;
uint64_t npts = duration >= 0 ? pts + duration : UINT64_MAX;
/* This should normally never happen.
* - The last queued frame can't have a PTS that goes more than 50ms in the
* future. This is guaranteed by the playloop, which currently actually
* roughly queues 50ms ahead, plus the flip queue offset. Just to be sure
* give some additional room by doubling the time.
* - The last vsync can never be in the future.
*/
int64_t max_pts_ahead = (vo->flip_queue_offset + 0.050) * 2 * 1e9;
if (vc->last_queue_time > now + max_pts_ahead ||
vc->recent_vsync_time > now)
{
vc->last_queue_time = 0;
vc->recent_vsync_time = 0;
MP_WARN(vo, "Inconsistent timing detected.\n");
}
#define PREV_VSYNC(ts) prev_vsync(vc, ts)
/* We hope to be here at least one vsync before the frame should be shown.