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Reduce VideoToolbox renderer video latency

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This commit is contained in:
Cameron Gutman 2018-07-18 22:25:46 -07:00
parent e32aace443
commit e85ca2a6c9
1 changed files with 11 additions and 3 deletions
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14
app/streaming/video/ffmpeg-renderers/vt.mm
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@ -140,15 +140,23 @@ public:
CVReturn
displayLinkOutputCallback(
CVDisplayLinkRef,
const CVTimeStamp*,
const CVTimeStamp* vsyncTime,
const CVTimeStamp* now,
const CVTimeStamp* /* vsyncTime */,
CVOptionFlags,
CVOptionFlags*,
void *displayLinkContext)
{
VTRenderer* me = reinterpret_cast<VTRenderer*>(displayLinkContext);
me->drawFrame(vsyncTime->hostTime);
// In my testing on macOS 10.13, this callback is invoked about 24 ms
// prior to the specified v-sync time (now - vsyncTime). Since this is
// greater than the standard v-sync interval (16 ms = 60 FPS), we will
// draw using the current host time, rather than the actual v-sync target
// time. Because the CVDisplayLink is in sync with the actual v-sync
// interval, even if many ms prior, we can safely use the current host time
// and get a consistent callback for each v-sync. This reduces video latency
// by at least 1 frame vs. rendering with the actual vsyncTime.
me->drawFrame(now->hostTime);
return kCVReturnSuccess;
}