Simplify VideoReader and VideoWriter

remoting/protocol/video_writer.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.
-
-// VideoWriter is a generic interface used by ConnectionToClient to
-// write into the video stream. ProtobufVideoWriter implements this
-// interface for protobuf video streams.
-
-#ifndef REMOTING_PROTOCOL_VIDEO_WRITER_H_
-#define REMOTING_PROTOCOL_VIDEO_WRITER_H_
-
-#include "base/basictypes.h"
-#include "base/callback.h"
-#include "remoting/protocol/video_stub.h"
-
-namespace remoting {
-namespace protocol {
-
-class Session;
-class SessionConfig;
-
-class VideoWriter : public VideoStub {
- public:
-  virtual ~VideoWriter();
-
-  // The callback is called when initialization is finished. The
-  // parameter is set to true on success.
-  typedef base::Callback<void(bool)> InitializedCallback;
-
-  static scoped_ptr<VideoWriter> Create(const SessionConfig& config);
-
-  // Initializes the writer.
-  virtual void Init(Session* session, const InitializedCallback& callback) = 0;
-
-  // Stops writing. Must be called on the network thread before this
-  // object is destroyed.
-  virtual void Close() = 0;
-
-  // Returns true if the channel is connected.
-  virtual bool is_connected() = 0;
-
- protected:
-  VideoWriter() { }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(VideoWriter);
-};
-
-}  // namespace protocol
-}  // namespace remoting
-
-#endif  // REMOTING_PROTOCOL_VIDEO_WRITER_H_