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Avoid blocking decoding operations during Present calls

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This commit is contained in:
Cameron Gutman
2019-01-20 14:08:53 -08:00
parent 49f0b45fa8
commit d6b4c8e7da
2 changed files with 15 additions and 2 deletions
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16
app/streaming/video/ffmpeg-renderers/dxva2.cpp
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@@ -27,7 +27,8 @@ DXVA2Renderer::DXVA2Renderer() :
m_ProcService(nullptr),
m_Processor(nullptr),
m_FrameIndex(0),
m_OverlayFont(nullptr)
m_OverlayFont(nullptr),
m_BlockingPresent(false)
{
RtlZeroMemory(m_DecSurfaces, sizeof(m_DecSurfaces));
RtlZeroMemory(&m_DXVAContext, sizeof(m_DXVAContext));
@@ -541,6 +542,8 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
d3dpp.BackBufferCount = 1;
}
m_BlockingPresent = false;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"Windowed mode with DWM running");
}
@@ -550,6 +553,7 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_ONE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferCount = 1;
m_BlockingPresent = true;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"V-Sync enabled");
@@ -560,6 +564,7 @@ bool DXVA2Renderer::initializeDevice(SDL_Window* window, bool enableVsync)
d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
d3dpp.BackBufferCount = 1;
m_BlockingPresent = false;
SDL_LogInfo(SDL_LOG_CATEGORY_APPLICATION,
"V-Sync disabled in tearing mode");
@@ -872,7 +877,14 @@ void DXVA2Renderer::renderFrameAtVsync(AVFrame *frame)
return;
}
hr = m_Device->PresentEx(nullptr, nullptr, nullptr, nullptr, 0);
do {
// Use D3DPRESENT_DONOTWAIT if present may block in order to avoid holding the giant
// lock around this D3D device for excessive lengths of time (blocking concurrent decoding tasks).
hr = m_Device->PresentEx(nullptr, nullptr, nullptr, nullptr, m_BlockingPresent ? D3DPRESENT_DONOTWAIT : 0);
if (hr == D3DERR_WASSTILLDRAWING) {
SDL_Delay(1);
}
} while (hr == D3DERR_WASSTILLDRAWING);
if (FAILED(hr)) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
"PresentEx() failed: %x",

1
app/streaming/video/ffmpeg-renderers/dxva2.h
View File

@@ -70,4 +70,5 @@ private:
DXVA2_VideoDesc m_Desc;
REFERENCE_TIME m_FrameIndex;
LPD3DXFONT m_OverlayFont;
bool m_BlockingPresent;
};