Add VideoReader and VideoWriter interfaces.

remoting/protocol/video_writer.h

Index: remoting/protocol/video_writer.h
diff --git a/remoting/protocol/video_writer.h b/remoting/protocol/video_writer.h
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+// Copyright (c) 2010 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 for a video stream writer. RtpVideoWriter
+// and ProtobufVideoWriter implement this interface for RTP and protobuf video
+// streams. VideoWriter is used by ConnectionToClient to write into the video
+// stream.
+
+#ifndef REMOTING_PROTOCOL_VIDEO_WRITER_H_
+#define REMOTING_PROTOCOL_VIDEO_WRITER_H_
+
+#include "base/basictypes.h"
+#include "remoting/proto/video.pb.h"
+
+namespace remoting {
+
+class ChromotocolConfig;
+class ChromotocolConnection;
+
+// TODO(sergeyu): VideoWriter should implement VideoStub interface.
+class VideoWriter {
+ public:
+  virtual ~VideoWriter();
+
+  static VideoWriter* Create(const ChromotocolConfig* config);
+
+  // Initializes the writer.
+  virtual void Init(ChromotocolConnection* connection) = 0;
+
+  // Sends the |packet|.
+  virtual void SendPacket(const VideoPacket& packet) = 0;
+
+  // Returns number of packets currently pending in the buffer.
+  virtual int GetPendingPackets() = 0;
+
+  virtual void Close() = 0;
+
+ protected:
+  VideoWriter() { }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoWriter);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_VIDEO_WRITER_H_