Add VideoProcessor interface.

remoting/client/software_video_renderer.h

+// Copyright (c) 2012 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 REMOTING_CLIENT_SOFTWARE_VIDEO_RENDERER_H_
+#define REMOTING_CLIENT_SOFTWARE_VIDEO_RENDERER_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "remoting/client/chromoting_stats.h"
+#include "remoting/client/frame_consumer_proxy.h"
+#include "remoting/client/frame_producer.h"
+#include "remoting/client/video_renderer.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}  // namespace base
+
+namespace remoting {
+
+class ChromotingStats;
+
+// Implementation of VideoRenderer interface that decodes frame on CPU (on a
+// decode thread) and then passes decoded frames to a FrameConsumer.
+// FrameProducer methods can be called on any thread. All other methods must be

[Wez, 2014/01/22 20:17:31]

How do we guarantee that that other thread doesn't call FrameProducer methods
after we've deleted this object - can we clarify that guarantee here?

[Sergey Ulanov, 2014/01/23 01:02:43]

Done.

+// called in the main thread.

[Wez, 2014/01/22 20:17:31]

nit: in -> on

[Sergey Ulanov, 2014/01/23 01:02:43]

Done.

+class SoftwareVideoRenderer : public VideoRenderer,
+                              public FrameProducer,
+                              public base::NonThreadSafe {
+ public:
+  // Creates an update decoder on |main_task_runner_| and |decode_task_runner_|,
+  // outputting to |consumer|. The |main_task_runner_| is responsible for
+  // receiving and queueing packets. The |decode_task_runner_| is responsible
+  // for decoding the video packets.
+  // TODO(wez): Replace the ref-counted proxy with an owned FrameConsumer.
+  SoftwareVideoRenderer(
+      scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner,
+      scoped_refptr<FrameConsumerProxy> consumer);
+  virtual ~SoftwareVideoRenderer();
+
+  // VideoRenderer implementation.
+  virtual void Initialize(const protocol::SessionConfig& config) OVERRIDE;
+  virtual ChromotingStats* GetStats() OVERRIDE;
+  virtual void ProcessVideoPacket(scoped_ptr<VideoPacket> packet,
+                                  const base::Closure& done) OVERRIDE;
+
+  // FrameProducer implementation. These methods may be called before we are
+  // Initialize()d, or we know the source screen size. These methods may be
+  // called on any thread.
+  //
+  // TODO(sergeyu): On Android a separate display thread is used for drawing.
+  // FrameConsumer calls FrameProducer on that thread. Can we avoid having a
+  // separate display thread? E.g. can we do everything on the decode thread?
+  virtual void DrawBuffer(webrtc::DesktopFrame* buffer) OVERRIDE;
+  virtual void InvalidateRegion(const webrtc::DesktopRegion& region) OVERRIDE;
+  virtual void RequestReturnBuffers(const base::Closure& done) OVERRIDE;
+  virtual void SetOutputSizeAndClip(
+      const webrtc::DesktopSize& view_size,
+      const webrtc::DesktopRect& clip_area) OVERRIDE;
+
+ private:
+  class Core;
+
+  // Callback method when a VideoPacket is processed. |decode_start| contains
+  // the timestamp when the packet will start to be processed.
+  void OnPacketDone(base::Time decode_start, const base::Closure& done);
+
+  scoped_refptr<base::SingleThreadTaskRunner> decode_task_runner_;
+  scoped_ptr<Core> core_;
+
+  ChromotingStats stats_;
+
+  // Keep track of the most recent sequence number bounced back from the host.
+  int64 latest_sequence_number_;
+
+  base::WeakPtrFactory<SoftwareVideoRenderer> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(SoftwareVideoRenderer);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_CLIENT_SOFTWARE_VIDEO_RENDERER_H_