Mirrors/moonlight-qt
2
0
Fork 0
mirror of https://github.com/moonlight-stream/moonlight-qt synced 2024-12-13 21:02:28 +00:00
Code Issues Projects Releases Packages Wiki Activity

Reduce VideoToolbox renderer video latency

Browse source
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
Show stats Download patch file Download diff file Expand all files Collapse all files

14
app/streaming/video/ffmpeg-renderers/vt.mm
View file

@ -140,15 +140,23 @@ public:
CVReturn CVReturn
displayLinkOutputCallback( displayLinkOutputCallback(
CVDisplayLinkRef, CVDisplayLinkRef,
const CVTimeStamp*, const CVTimeStamp* now,
const CVTimeStamp* vsyncTime, const CVTimeStamp* /* vsyncTime */,
CVOptionFlags, CVOptionFlags,
CVOptionFlags*, CVOptionFlags*,
void *displayLinkContext) void *displayLinkContext)
{ {
VTRenderer* me = reinterpret_cast<VTRenderer*>(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; return kCVReturnSuccess;
} }