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x11grab: fixed next frame capture time calculation

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The next frame time could slip, causing the frame rate to drop until
 frames were dropped. Now will capture at the next correct moment instead.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Trevor \\\\ Higgins 2016-02-03 09:10:01 -05:00 committed by Michael Niedermayer
parent 1bbfaba196
commit 6632802aa0
1 changed files with 5 additions and 5 deletions
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10
libavdevice/x11grab.c
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@ -526,16 +526,11 @@ static int x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
int64_t curtime, delay;
struct timespec ts;
/* Calculate the time of the next frame */
s->time_frame += INT64_C(1000000);
/* wait based on the frame rate */
for (;;) {
curtime = av_gettime();
delay = s->time_frame * av_q2d(s->time_base) - curtime;
if (delay <= 0) {
if (delay < INT64_C(-1000000) * av_q2d(s->time_base))
s->time_frame += INT64_C(1000000);
break;
}
ts.tv_sec = delay / 1000000;
@ -543,6 +538,11 @@ static int x11grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
nanosleep(&ts, NULL);
}
/* Calculate the time of the next frame */
do {
s->time_frame += INT64_C(1000000);
} while ((s->time_frame * av_q2d(s->time_base) - curtime) <= 0);
av_init_packet(pkt);
pkt->data = image->data;
pkt->size = s->frame_size;