talk/session/phone/ssrcmuxfilter.h

/*
 * libjingle
 * Copyright 2004--2011, Google Inc.
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#ifndef TALK_SESSION_PHONE_SSRCMUXFILTER_H_
#define TALK_SESSION_PHONE_SSRCMUXFILTER_H_

#include <vector>

#include "talk/base/basictypes.h"
#include "talk/session/phone/streamparams.h"

namespace cricket {

// This class maintains list of recv SSRC's destined for cricket::BaseChannel.
// In case of single RTP session and single transport channel, all session
// ( or media) channels share a common transport channel. Hence they all get
// SignalReadPacket when packet received on transport channel. This requires
// cricket::BaseChannel to know all the valid sources, else media channel
// will decode invalid packets.
class SsrcMuxFilter {
 public:
  SsrcMuxFilter();
  ~SsrcMuxFilter();

  // Whether the rtp mux is active for a sdp session.
  // Returns true if the filter contains a stream.
  bool IsActive() const;
  // Determines packet belongs to valid cricket::BaseChannel.
  bool DemuxPacket(const char* data, size_t len, bool rtcp);
  // Adding a valid source to the filter.
  bool AddStream(const StreamParams& stream);
  // Removes source from the filter.
  bool RemoveStream(uint32 ssrc);
  // Utility method added for unitest.
  bool FindStream(uint32 ssrc) const;

 private:
  std::vector<StreamParams> streams_;
};

}  // namespace cricket

#endif  // TALK_SESSION_PHONE_SSRCMUXFILTER_H_