Add VideoReader and VideoWriter interfaces.

remoting/protocol/video_reader.h

+// 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.
+
+// VideoReader is a generic interface for a video stream reader. RtpVideoReader
+// and ProtobufVideoReader implement this interface for RTP and protobuf video
+// streams. VideoReader is used by ConnectionToHost to read video stream.
+
+#ifndef REMOTING_PROTOCOL_VIDEO_READER_H_
+#define REMOTING_PROTOCOL_VIDEO_READER_H_
+
+#include "base/callback.h"
+#include "remoting/protocol/video_stub.h"
+
+namespace remoting {
+
+class ChromotocolConfig;
+class ChromotocolConnection;
+
+class VideoReader {
+ public:
+  static VideoReader* Create(const ChromotocolConfig* config);
+
+  virtual ~VideoReader();
+
+  // Initializies the reader. Doesn't take ownership of either |connection|
+  // or |video_stub|.
+  virtual void Init(ChromotocolConnection* connection,
+                    VideoStub* video_stub) = 0;
+
+  // Closes the reader. The stub should not be called after Close().
+  virtual void Close() = 0;
+
+ protected:
+  VideoReader() { }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoReader);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_VIDEO_READER_H_