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Don't pace frame delivery if the display refresh rate has dropped

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This commit is contained in:
Cameron Gutman
2022-02-12 19:14:06 -06:00
parent 6435afd229
commit 6fb6b9bf38
1 changed files with 17 additions and 6 deletions
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23
Limelight/Stream/VideoDecoderRenderer.m
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@@ -99,7 +99,10 @@
- (void)start
{
_displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(displayLinkCallback:)];
if (@available(iOS 10.0, tvOS 10.0, *)) {
if (@available(iOS 15.0, tvOS 15.0, *)) {
_displayLink.preferredFrameRateRange = CAFrameRateRangeMake(self->frameRate, self->frameRate, self->frameRate);
}
else if (@available(iOS 10.0, tvOS 10.0, *)) {
_displayLink.preferredFramesPerSecond = self->frameRate;
}
[_displayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
@@ -116,11 +119,19 @@ int DrSubmitDecodeUnit(PDECODE_UNIT decodeUnit);
while (LiPollNextVideoFrame(&handle, &du)) {
LiCompleteVideoFrame(handle, DrSubmitDecodeUnit(du));
if (framePacing){
// Always keep one pending frame smooth out gaps due to
// network jitter at the cost of 1 frame of latency
if (LiGetPendingVideoFrames() == 1) {
break;
if (framePacing) {
// Calculate the actual display refresh rate
double displayRefreshRate = 1 / (_displayLink.targetTimestamp - _displayLink.timestamp);
// Only pace frames if the display refresh rate is >= 90% of our stream frame rate.
// Battery saver, accessibility settings, or device thermals can cause the actual
// refresh rate of the display to drop below the physical maximum.
if (displayRefreshRate >= frameRate * 0.9f) {
// Keep one pending frame to smooth out gaps due to
// network jitter at the cost of 1 frame of latency
if (LiGetPendingVideoFrames() == 1) {
break;
}
}
}
}