ArcBridge: Add VideoEncodeAccelerator implementation.

chrome/gpu/gpu_arc_video_encode_accelerator.h

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_GPU_GPU_ARC_VIDEO_ENCODE_ACCELERATOR_H_
+#define CHROME_GPU_GPU_ARC_VIDEO_ENCODE_ACCELERATOR_H_
+
+#include <memory>
+#include <vector>
+
+#include "base/files/scoped_file.h"
+#include "base/macros.h"
+#include "components/arc/common/video_encode_accelerator.mojom.h"
+#include "components/arc/video_accelerator/video_accelerator.h"
+#include "gpu/command_buffer/service/gpu_preferences.h"
+#include "media/video/video_encode_accelerator.h"
+
+namespace chromeos {
+namespace arc {
+
+// GpuArcVideoEncodeAccelerator manages life-cycle and IPC message translation
+// for media::VideoEncodeAccelerator.
+class GpuArcVideoEncodeAccelerator
+    : public ::arc::mojom::VideoEncodeAccelerator,
+      public media::VideoEncodeAccelerator::Client {
+ public:
+  explicit GpuArcVideoEncodeAccelerator(
+      const gpu::GpuPreferences& gpu_preferences);
+  ~GpuArcVideoEncodeAccelerator() override;
+
+ private:
+  using VideoPixelFormat = media::VideoPixelFormat;
+  using VideoCodecProfile = media::VideoCodecProfile;
+  using Error = media::VideoEncodeAccelerator::Error;
+  using VideoEncodeClientPtr = ::arc::mojom::VideoEncodeClientPtr;
+
+  // VideoEncodeAccelerator::Client implementation.
+  void RequireBitstreamBuffers(unsigned int input_count,
+                               const gfx::Size& input_coded_size,
+                               size_t output_buffer_size) override;
+  void BitstreamBufferReady(int32_t bitstream_buffer_id,
+                            size_t payload_size,
+                            bool key_frame,
+                            base::TimeDelta timestamp) override;
+  void NotifyError(Error error) override;
+
+  // ::arc::mojom::VideoEncodeAccelerator implementation.
+  void GetSupportedProfiles(
+      const GetSupportedProfilesCallback& callback) override;
+  void Initialize(VideoPixelFormat input_format,
+                  const gfx::Size& visible_size,
+                  VideoEncodeAccelerator::StorageType input_storage,
+                  VideoCodecProfile output_profile,
+                  uint32_t initial_bitrate,
+                  VideoEncodeClientPtr client,
+                  const InitializeCallback& callback) override;
+  void Encode(mojo::ScopedHandle fd,
+              std::vector<::arc::VideoFramePlane> planes,
+              int64_t timestamp,
+              bool force_keyframe) override;
+  void UseOutputBitstreamBuffer(int32_t bitstream_buffer_id,
+                                mojo::ScopedHandle shmem_fd,
+                                uint32_t offset,
+                                uint32_t size) override;
+  void RequestEncodingParametersChange(uint32_t bitrate,
+                                       uint32_t framerate) override;
+
+  // Unwraps a file descriptor from the given mojo::ScopedHandle.
+  // At errors, returns an invalid base::ScopedFD and notifies client about

[Luis Héctor Chávez, 2017/06/08 15:00:43]

nit: "If an error is encountered, it returns..." 

[Owen Lin, 2017/06/09 06:03:53]

Done. Thanks.

+  // the error via VideoEncodeClient::NotifyError.
+  base::ScopedFD UnwrapFdFromMojoHandle(mojo::ScopedHandle handle);
+
+  gpu::GpuPreferences gpu_preferences_;
+  std::unique_ptr<media::VideoEncodeAccelerator> accelerator_;
+  ::arc::mojom::VideoEncodeClientPtr client_;
+  gfx::Size coded_size_;
+  gfx::Size visible_size_;
+  media::VideoPixelFormat input_pixel_format_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuArcVideoEncodeAccelerator);
+};
+
+}  // namespace arc
+}  // namespace chromeos
+
+#endif  // CHROME_GPU_GPU_ARC_VIDEO_ENCODE_ACCELERATOR_H_