1 files changed, 136 insertions, 0 deletions
diff --git a/dom/media/platforms/ffmpeg/FFmpegVideoFramePool.h b/dom/media/platforms/ffmpeg/FFmpegVideoFramePool.h
new file mode 100644
index 0000000000..2f964864ed
--- /dev/null
+++ b/dom/media/platforms/ffmpeg/FFmpegVideoFramePool.h
@@ -0,0 +1,136 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __FFmpegVideoFramePool_h__
+#define __FFmpegVideoFramePool_h__
+
+#include "FFmpegLibWrapper.h"
+#include "FFmpegLibs.h"
+#include "FFmpegLog.h"
+
+#include "mozilla/layers/DMABUFSurfaceImage.h"
+#include "mozilla/widget/DMABufLibWrapper.h"
+#include "mozilla/widget/DMABufSurface.h"
+
+namespace mozilla {
+
+// VideoFrameSurface holds a reference to GPU data with a video frame.
+//
+// Actual GPU pixel data are stored at DMABufSurface and
+// DMABufSurface is passed to gecko GL rendering pipeline via.
+// DMABUFSurfaceImage.
+//
+// VideoFrameSurface can optionally hold VA-API ffmpeg related data to keep
+// GPU data locked untill we need them.
+//
+// VideoFrameSurface is used for both HW accelerated video decoding
+// (VA-API) and ffmpeg SW decoding.
+//
+// VA-API scenario
+//
+// When VA-API decoding is running, ffmpeg allocates AVHWFramesContext - a pool
+// of "hardware" frames. Every "hardware" frame (VASurface) is backed
+// by actual piece of GPU memory which holds the decoded image data.
+//
+// The VASurface is wrapped by DMABufSurface and transferred to
+// rendering queue by DMABUFSurfaceImage, where TextureClient is
+// created and VASurface is used as a texture there.
+//
+// As there's a limited number of VASurfaces, ffmpeg reuses them to decode
+// next frames ASAP even if they are still attached to DMABufSurface
+// and used as a texture in our rendering engine.
+//
+// Unfortunately there isn't any obvious way how to mark particular VASurface
+// as used. The best we can do is to hold a reference to particular AVBuffer
+// from decoded AVFrame and AVHWFramesContext which owns the AVBuffer.
+template <int V>
+class VideoFrameSurface {};
+template <>
+class VideoFrameSurface<LIBAV_VER>;
+
+template <int V>
+class VideoFramePool {};
+template <>
+class VideoFramePool<LIBAV_VER>;
+
+template <>
+class VideoFrameSurface<LIBAV_VER> {
+  friend class VideoFramePool<LIBAV_VER>;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VideoFrameSurface)
+
+  explicit VideoFrameSurface(DMABufSurface* aSurface);
+
+  void SetYUVColorSpace(mozilla::gfx::YUVColorSpace aColorSpace) {
+    mSurface->GetAsDMABufSurfaceYUV()->SetYUVColorSpace(aColorSpace);
+  }
+  void SetColorRange(mozilla::gfx::ColorRange aColorRange) {
+    mSurface->GetAsDMABufSurfaceYUV()->SetColorRange(aColorRange);
+  }
+
+  RefPtr<DMABufSurfaceYUV> GetDMABufSurface() {
+    return mSurface->GetAsDMABufSurfaceYUV();
+  };
+
+  RefPtr<layers::Image> GetAsImage();
+
+  // Don't allow VideoFrameSurface plain copy as it leads to
+  // unexpected DMABufSurface/HW buffer releases and we don't want to
+  // deep copy them.
+  VideoFrameSurface(const VideoFrameSurface&) = delete;
+  const VideoFrameSurface& operator=(VideoFrameSurface const&) = delete;
+
+ protected:
+  // Lock VAAPI related data
+  void LockVAAPIData(AVCodecContext* aAVCodecContext, AVFrame* aAVFrame,
+                     FFmpegLibWrapper* aLib);
+  // Release VAAPI related data, DMABufSurface can be reused
+  // for another frame.
+  void ReleaseVAAPIData(bool aForFrameRecycle = true);
+
+  // Check if DMABufSurface is used by any gecko rendering process
+  // (WebRender or GL compositor) or by DMABUFSurfaceImage/VideoData.
+  bool IsUsed() const { return mSurface->IsGlobalRefSet(); }
+  void MarkAsUsed() { mSurface->GlobalRefAdd(); }
+
+ private:
+  virtual ~VideoFrameSurface();
+
+  const RefPtr<DMABufSurface> mSurface;
+  const FFmpegLibWrapper* mLib;
+  AVBufferRef* mAVHWFrameContext;
+  AVBufferRef* mHWAVBuffer;
+};
+
+// VideoFramePool class is thread-safe.
+template <>
+class VideoFramePool<LIBAV_VER> {
+ public:
+  VideoFramePool();
+  ~VideoFramePool();
+
+  RefPtr<VideoFrameSurface<LIBAV_VER>> GetVideoFrameSurface(
+      VADRMPRIMESurfaceDescriptor& aVaDesc, int aWidth, int aHeight,
+      AVCodecContext* aAVCodecContext, AVFrame* aAVFrame,
+      FFmpegLibWrapper* aLib);
+  void ReleaseUnusedVAAPIFrames();
+
+ private:
+  RefPtr<VideoFrameSurface<LIBAV_VER>> GetFreeVideoFrameSurface();
+
+ private:
+  // Protect mDMABufSurfaces pool access
+  Mutex mSurfaceLock MOZ_UNANNOTATED;
+  nsTArray<RefPtr<VideoFrameSurface<LIBAV_VER>>> mDMABufSurfaces;
+  // We may fail to create texture over DMABuf memory due to driver bugs so
+  // check that before we export first DMABuf video frame.
+  Maybe<bool> mTextureCreationWorks;
+};
+
+}  // namespace mozilla
+
+#endif  // __FFmpegVideoFramePool_h__