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Wait on the display link callback before rendering to reduce latency

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This commit is contained in:
Cameron Gutman 2022-04-07 22:08:43 -05:00
commit 9790c218dc
1 changed files with 13 additions and 10 deletions
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23
app/streaming/video/ffmpeg-renderers/vt.mm
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@ -158,6 +158,19 @@ public:
return true;
}
virtual void waitToRender() override
{
if (m_DisplayLink != nullptr) {
// Vsync is enabled, so wait for a swap before returning
SDL_LockMutex(m_VsyncMutex);
if (SDL_CondWaitTimeout(m_VsyncPassed, m_VsyncMutex, 100) == SDL_MUTEX_TIMEDOUT) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"V-sync wait timed out after 100 ms");
}
SDL_UnlockMutex(m_VsyncMutex);
}
}
// Caller frees frame after we return
virtual void renderFrame(AVFrame* frame) override
{
@ -230,16 +243,6 @@ public:
}
}
if (m_DisplayLink != nullptr) {
// Vsync is enabled, so wait for a swap before returning
SDL_LockMutex(m_VsyncMutex);
if (SDL_CondWaitTimeout(m_VsyncPassed, m_VsyncMutex, 100) == SDL_MUTEX_TIMEDOUT) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"V-sync wait timed out after 100 ms");
}
SDL_UnlockMutex(m_VsyncMutex);
}
// Queue this sample for the next v-sync
CMSampleTimingInfo timingInfo = {
.duration = kCMTimeInvalid,