Add VideoReader and VideoWriter interfaces.

remoting/protocol/rtp_writer.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.
 
 #ifndef REMOTING_PROTOCOL_RTP_WRITER_H_
 #define REMOTING_PROTOCOL_RTP_WRITER_H_
 
 #include "net/socket/socket.h"
 #include "remoting/protocol/buffered_socket_writer.h"
 
 namespace remoting {
 
 class RtpWriter {
  public:
   RtpWriter();
   virtual ~RtpWriter();
 
   // Initializes the writer. Must be called on the thread the sockets belong
   // to.
   void Init(net::Socket* rtp_socket, net::Socket* rtcp_socket);
 
-  void SendPacket(const char* buffer, int packet_size,
-                  uint32 timestamp);
+  // Sends next packet.
+  void SendPacket(const char* payload, int payload_size, uint32 timestamp);
+
+  // Returns number of packets queued in the buffer.
+  int GetPendingPackets();
 
   // Stop writing and drop pending data. Must be called from the same thread as
   // Init().
   void Close();
 
  private:
   net::Socket* rtp_socket_;
   net::Socket* rtcp_socket_;
 
   uint32 last_packet_number_;
 
   scoped_refptr<BufferedDatagramWriter> buffered_rtp_writer_;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_RTP_WRITER_H_