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changeset: 544864:a8603f131703
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tag: tip
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parent: 544861:161920b70ae4
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user: Martin Stransky <stransky@redhat.com>
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date: Fri Jul 31 13:39:48 2020 +0200
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files: dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
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description:
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Bug 1645671 [Linux/VA-API] Create DMABufSurfaceWrapper directly at nsTAttay and disable DMABufSurfaceWrapper class copy and assignment constructors, r?jya
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When DMABufSurfaceWrapper is added to nsTArray, a temporary local DMABufSurfaceWrapper object is created. When the temporary
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object is deleted after the adding, associated dmabuf data is released which leads to rendering artifact during VA-API video playback.
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As a fix in this patch we create DMABufSurfaceWrapper 'in-place' at nsTAttay.
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We also disable DMABufSurfaceWrapper class copy and assignment constructors to avoid similar potential issues.
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Differential Revision: https://phabricator.services.mozilla.com/D85152
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diff --git a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
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--- a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
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+++ b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
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@@ -777,17 +777,17 @@ MediaResult FFmpegVideoDecoder
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RESULT_DETAIL("Unable to get DMABufSurfaceYUV"));
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}
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# ifdef MOZ_LOGGING
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static int uid = 0;
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surface->SetUID(++uid);
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FFMPEG_LOG("Created new DMABufSurface UID = %d", uid);
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# endif
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- mDMABufSurfaces.AppendElement(DMABufSurfaceWrapper(surface, mLib));
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+ mDMABufSurfaces.EmplaceBack(surface, mLib);
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surfaceWrapper = &(mDMABufSurfaces[mDMABufSurfaces.Length() - 1]);
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} else {
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surface = surfaceWrapper->GetDMABufSurface();
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bool ret;
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if (mVAAPIDeviceContext) {
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ret = surface->UpdateYUVData(vaDesc);
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} else {
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diff --git a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
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--- a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
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+++ b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
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@@ -70,16 +70,22 @@ class DMABufSurfaceWrapper final {
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// Check if DMABufSurface is used by any gecko rendering process
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// (WebRender or GL compositor) or by DMABUFSurfaceImage/VideoData.
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bool IsUsed() const { return mSurface->IsGlobalRefSet(); }
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RefPtr<DMABufSurfaceYUV> GetDMABufSurface() const {
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return mSurface->GetAsDMABufSurfaceYUV();
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}
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+ // Don't allow DMABufSurfaceWrapper plain copy as it leads to
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+ // enexpected DMABufSurface/HW buffer releases and we don't want to
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+ // deep copy them.
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+ DMABufSurfaceWrapper(const DMABufSurfaceWrapper&) = delete;
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+ const DMABufSurfaceWrapper& operator=(DMABufSurfaceWrapper const&) = delete;
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+
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private:
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const RefPtr<DMABufSurface> mSurface;
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const FFmpegLibWrapper* mLib;
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AVBufferRef* mAVHWFramesContext;
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AVBufferRef* mHWAVBuffer;
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};
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#endif
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