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Limit the number of queued frames in Pacer to prevent excessive memory consumption if the renderer gets blocked for a while

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This commit is contained in:
Cameron Gutman 2019-02-18 12:13:45 -08:00
parent b6872456cd
commit e5a8b49c93
2 changed files with 18 additions and 0 deletions
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16
app/streaming/video/ffmpeg-renderers/pacer/pacer.cpp
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@ -14,6 +14,10 @@
#include "dxvsyncsource.h"
#endif
// Limit the number of queued frames to prevent excessive memory consumption
// if the V-Sync source or renderer is blocked for a while.
#define MAX_QUEUED_FRAMES 8
// We may be woken up slightly late so don't go all the way
// up to the next V-sync since we may accidentally step into
// the next V-sync period. It also takes some amount of time
@ -162,6 +166,7 @@ void Pacer::vsyncCallback(int timeUntilNextVsyncMillis)
}
// Place the first frame on the render queue
dropFrameForEnqueue(m_RenderQueue);
m_RenderQueue.enqueue(m_PacingQueue.dequeue());
m_FrameQueueLock.unlock();
m_RenderQueueNotEmpty.wakeOne();
@ -253,6 +258,15 @@ void Pacer::renderFrame(AVFrame* frame)
m_FrameQueueLock.unlock();
}
void Pacer::dropFrameForEnqueue(QQueue<AVFrame*>& queue)
{
SDL_assert(queue.size() <= MAX_QUEUED_FRAMES);
if (queue.size() == MAX_QUEUED_FRAMES) {
AVFrame* frame = queue.dequeue();
av_frame_free(&frame);
}
}
void Pacer::submitFrame(AVFrame* frame)
{
// Make sure initialize() has been called
@ -261,9 +275,11 @@ void Pacer::submitFrame(AVFrame* frame)
// Queue the frame and possibly wake up the render thread
m_FrameQueueLock.lock();
if (m_VsyncSource != nullptr) {
dropFrameForEnqueue(m_PacingQueue);
m_PacingQueue.enqueue(frame);
}
else {
dropFrameForEnqueue(m_RenderQueue);
m_RenderQueue.enqueue(frame);
}
m_FrameQueueLock.unlock();

2
app/streaming/video/ffmpeg-renderers/pacer/pacer.h
View file

@ -31,6 +31,8 @@ private:
void renderFrame(AVFrame* frame);
void dropFrameForEnqueue(QQueue<AVFrame*>& queue);
QQueue<AVFrame*> m_RenderQueue;
QQueue<AVFrame*> m_PacingQueue;
QQueue<int> m_PacingQueueHistory;