Add media::VideoEncodeAccelerator with WebRTC integration

content/common/gpu/client/gpu_video_encode_accelerator_host.h

+// Copyright (c) 2013 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 CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_ENCODE_ACCELERATOR_HOST_H_
+#define CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_ENCODE_ACCELERATOR_HOST_H_
+
+#include <vector>
+
+#include "base/containers/hash_tables.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "ipc/ipc_listener.h"
+#include "media/video/video_encode_accelerator.h"
+
+namespace gfx {
+
+class Size;
+
+}  // namespace gfx
+
+namespace media {
+
+class VideoFrame;
+
+}  // namespace media
+
+namespace content {
+
+class GpuChannelHost;
+
+// This class is the renderer-side host for the VideoEncodeAccelerator in the
+// GPU process, coordinated over IPC.
+class GpuVideoEncodeAcceleratorHost
+    : public IPC::Listener,
+      public media::VideoEncodeAccelerator,
+      public base::SupportsWeakPtr<GpuVideoEncodeAcceleratorHost> {
+ public:
+  // |client| is assumed to outlive this object.  Since the GpuChannelHost does
+  // _not_ own this object, a reference to |gpu_channel_host| is taken.
+  GpuVideoEncodeAcceleratorHost(
+      media::VideoEncodeAccelerator::Client* client,
+      const scoped_refptr<GpuChannelHost>& gpu_channel_host,
+      int32 route_id);
+  virtual ~GpuVideoEncodeAcceleratorHost();
+
+  // Static query for the supported profiles.  This query proxies to
+  // GpuVideoEncodeAccelerator::GetSupportedProfiles().
+  static std::vector<SupportedProfile> GetSupportedProfiles();
+
+  // IPC::Listener implementation.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void OnChannelError() OVERRIDE;
+
+  // media::VideoEncodeAccelerator implementation.
+  virtual void Initialize(media::VideoFrame::Format format,
+                          const gfx::Size& input_visible_size,
+                          media::VideoCodecProfile output_profile,
+                          int32 initial_bitrate) OVERRIDE;
+  virtual void Encode(const scoped_refptr<media::VideoFrame>& frame,
+                      bool force_keyframe) OVERRIDE;
+  virtual void UseOutputBitstreamBuffer(
+      const media::BitstreamBuffer& buffer) OVERRIDE;
+  virtual void RequestEncodingParametersChange(int32 bitrate,
+                                               uint32 framerate_num) OVERRIDE;
+  virtual void Destroy() OVERRIDE;
+
+ private:
+  // Notify |client_| when an error has occured.  Used when notifying from
+  // within a media::VideoEncodeAccelerator entry point, to avoid re-entrancy.
+  void NotifyError(Error error);
+
+  // IPC handlers, proxying media::VideoEncodeAccelerator::Client for the GPU
+  // process.
+  void OnNotifyInitializeDone();
+  void OnRequireBitstreamBuffers(int input_count,
+                                 const gfx::Size& input_coded_size,
+                                 uint32 output_buffer_size);
+  void OnNotifyInputDone(int32 frame_id);
+  void OnBitstreamBufferReady(int32 bitstream_buffer_id,
+                              uint32 payload_size,
+                              bool key_frame);
+  void OnNotifyError(Error error);
+
+  void Send(IPC::Message* message);
+
+  // Weak pointer for client callbacks on the
+  // media::VideoEncodeAccelerator::Client interface.
+  base::WeakPtrFactory<VideoEncodeAccelerator::Client> client_ptr_factory_;
+  base::WeakPtr<VideoEncodeAccelerator::Client> client_;
+
+  // IPC channel and route ID.
+  scoped_refptr<GpuChannelHost> channel_;
+  const int32 route_id_;
+
+  // media::VideoFrames sent to the encoder.
+  // base::IDMap not used here, since that takes pointers, not scoped_refptr.
+  typedef base::hash_map<int32, scoped_refptr<media::VideoFrame> > FrameMap;
+  FrameMap frame_map_;
+
+  // ID serial number for the next frame to send to the GPU process.
+  int32 next_frame_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuVideoEncodeAcceleratorHost);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_CLIENT_GPU_VIDEO_ENCODE_ACCELERATOR_HOST_H_