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Drop a frame if the rendering time exceeds the v-sync period

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This commit is contained in:
Cameron Gutman
2019-01-20 19:59:29 -08:00
parent d6b4c8e7da
commit c064f87889
2 changed files with 41 additions and 17 deletions
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55
app/streaming/video/ffmpeg-renderers/pacer/pacer.cpp
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@@ -22,6 +22,7 @@
Pacer::Pacer(IFFmpegRenderer* renderer, PVIDEO_STATS videoStats) :
m_FrameQueueLock(0),
m_DropNextFrame(false),
m_VsyncSource(nullptr),
m_VsyncRenderer(renderer),
m_MaxVideoFps(0),
@@ -102,7 +103,8 @@ void Pacer::vsyncCallback(int timeUntilNextVsyncMillis)
SDL_AtomicUnlock(&m_FrameQueueLock);
}
// Nothing to render at this time
// Nothing to render at this time. This counts as a drop.
m_DropNextFrame = false;
return;
}
@@ -111,17 +113,7 @@ RenderNextFrame:
AVFrame* frame = m_FrameQueue.dequeue();
SDL_AtomicUnlock(&m_FrameQueueLock);
// Count time spent in Pacer's queues
Uint32 beforeRender = SDL_GetTicks();
m_VideoStats->totalPacerTime += beforeRender - frame->pts;
// Render it
m_VsyncRenderer->renderFrameAtVsync(frame);
m_VideoStats->totalRenderTime += SDL_GetTicks() - beforeRender;
m_VideoStats->renderedFrames++;
// Free the frame
av_frame_free(&frame);
renderFrame(frame);
}
bool Pacer::initialize(SDL_Window* window, int maxVideoFps, bool enablePacing)
@@ -156,6 +148,39 @@ bool Pacer::initialize(SDL_Window* window, int maxVideoFps, bool enablePacing)
return true;
}
void Pacer::renderFrame(AVFrame* frame)
{
// Drop this frame if we believe we've run into V-sync waits
if (m_DropNextFrame) {
m_VideoStats->pacerDroppedFrames++;
av_frame_free(&frame);
m_DropNextFrame = false;
return;
}
// Count time spent in Pacer's queues
Uint32 beforeRender = SDL_GetTicks();
m_VideoStats->totalPacerTime += beforeRender - frame->pts;
// Render it
m_VsyncRenderer->renderFrameAtVsync(frame);
Uint32 afterRender = SDL_GetTicks();
// If rendering took longer than an entire V-sync interval,
// there must have been a frame pending display that blocked us.
// Drop our next frame to clear the backed up display pipeline.
if (afterRender - beforeRender > 1000 / m_DisplayFps) {
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Render time exceeded V-sync period (%d ms); dropping next frame to reduce latency",
afterRender - beforeRender);
m_DropNextFrame = true;
}
m_VideoStats->totalRenderTime += afterRender - beforeRender;
m_VideoStats->renderedFrames++;
av_frame_free(&frame);
}
void Pacer::submitFrame(AVFrame* frame)
{
// Make sure initialize() has been called
@@ -170,11 +195,7 @@ void Pacer::submitFrame(AVFrame* frame)
SDL_AtomicUnlock(&m_FrameQueueLock);
}
else {
Uint32 beforeRender = SDL_GetTicks();
m_VsyncRenderer->renderFrameAtVsync(frame);
m_VideoStats->totalRenderTime += SDL_GetTicks() - beforeRender;
m_VideoStats->renderedFrames++;
av_frame_free(&frame);
renderFrame(frame);
}
}