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Optimize render to decode fence usage to reduce pipeline bubbles

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This commit is contained in:
Cameron Gutman
2026-01-19 18:38:38 -06:00
parent a0a4c1ea83
commit 1e825c85e5
2 changed files with 14 additions and 6 deletions
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17
app/streaming/video/ffmpeg-renderers/d3d11va.cpp
View File

@@ -226,12 +226,13 @@ bool D3D11VARenderer::setupSharedDevice(IDXGIAdapter1* adapter)
}
// Create our decode->render fence
m_DecodeRenderSyncFenceValue = 1;
m_D2RFenceValue = 1;
if (!createSharedFencePair(0, m_DecodeDevice.Get(), m_RenderDevice.Get(), m_DecodeD2RFence, m_RenderD2RFence)) {
goto Exit;
}
// Create our render->decode fence
m_R2DFenceValue = 1;
if (!createSharedFencePair(0, m_DecodeDevice.Get(), m_RenderDevice.Get(), m_DecodeR2DFence, m_RenderR2DFence)) {
goto Exit;
}
@@ -992,8 +993,8 @@ void D3D11VARenderer::renderVideo(AVFrame* frame)
SDL_assert(m_RenderD2RFence);
lockContext(this);
if (SUCCEEDED(m_DecodeDeviceContext->Signal(m_DecodeD2RFence.Get(), m_DecodeRenderSyncFenceValue))) {
m_RenderDeviceContext->Wait(m_RenderD2RFence.Get(), m_DecodeRenderSyncFenceValue++);
if (SUCCEEDED(m_DecodeDeviceContext->Signal(m_DecodeD2RFence.Get(), m_D2RFenceValue))) {
m_RenderDeviceContext->Wait(m_RenderD2RFence.Get(), m_D2RFenceValue++);
}
unlockContext(this);
}
@@ -1046,10 +1047,16 @@ void D3D11VARenderer::renderVideo(AVFrame* frame)
SDL_assert(m_DecodeR2DFence);
SDL_assert(m_RenderR2DFence);
if (SUCCEEDED(m_RenderDeviceContext->Signal(m_RenderR2DFence.Get(), m_DecodeRenderSyncFenceValue))) {
// Because Pacer keeps a reference to the current frame until the next frame is rendered,
// we insert a wait for the previous frame's fence value rather than the current one.
// This means the fence should generally not cause a pipeline bubble for the decoder
// unless rendering is taking much longer than expected.
if (SUCCEEDED(m_RenderDeviceContext->Signal(m_RenderR2DFence.Get(), m_R2DFenceValue))) {
lockContext(this);
m_DecodeDeviceContext->Wait(m_DecodeR2DFence.Get(), m_DecodeRenderSyncFenceValue++);
SDL_assert(m_R2DFenceValue > 0);
m_DecodeDeviceContext->Wait(m_DecodeR2DFence.Get(), m_R2DFenceValue - 1);
unlockContext(this);
m_R2DFenceValue++;
}
}
}

3
app/streaming/video/ffmpeg-renderers/d3d11va.h
View File

@@ -79,8 +79,9 @@ private:
SupportedFenceType m_FenceType;
Microsoft::WRL::ComPtr<ID3D11Fence> m_DecodeD2RFence, m_RenderD2RFence;
UINT64 m_D2RFenceValue;
Microsoft::WRL::ComPtr<ID3D11Fence> m_DecodeR2DFence, m_RenderR2DFence;
UINT64 m_DecodeRenderSyncFenceValue;
UINT64 m_R2DFenceValue;
SDL_mutex* m_ContextLock;
bool m_BindDecoderOutputTextures;