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      1 /*
      2  * libjingle
      3  * Copyright 2004 Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_SESSION_MEDIA_BUNDLEFILTER_H_
     29 #define TALK_SESSION_MEDIA_BUNDLEFILTER_H_
     30 
     31 #include <set>
     32 #include <vector>
     33 
     34 #include "talk/media/base/streamparams.h"
     35 #include "webrtc/base/basictypes.h"
     36 
     37 namespace cricket {
     38 
     39 // In case of single RTP session and single transport channel, all session
     40 // ( or media) channels share a common transport channel. Hence they all get
     41 // SignalReadPacket when packet received on transport channel. This requires
     42 // cricket::BaseChannel to know all the valid sources, else media channel
     43 // will decode invalid packets.
     44 //
     45 // This class determines whether a packet is destined for cricket::BaseChannel.
     46 // For rtp packets, this is decided based on the payload type. For rtcp packets,
     47 // this is decided based on the sender ssrc values.
     48 class BundleFilter {
     49  public:
     50   BundleFilter();
     51   ~BundleFilter();
     52 
     53   // Determines packet belongs to valid cricket::BaseChannel.
     54   bool DemuxPacket(const char* data, size_t len, bool rtcp);
     55 
     56   // Adds the supported payload type.
     57   void AddPayloadType(int payload_type);
     58 
     59   // Adding a valid source to the filter.
     60   bool AddStream(const StreamParams& stream);
     61 
     62   // Removes source from the filter.
     63   bool RemoveStream(uint32 ssrc);
     64 
     65   // Utility methods added for unitest.
     66   // True if |streams_| is not empty.
     67   bool HasStreams() const;
     68   bool FindStream(uint32 ssrc) const;
     69   bool FindPayloadType(int pl_type) const;
     70   void ClearAllPayloadTypes();
     71 
     72 
     73  private:
     74   std::set<int> payload_types_;
     75   std::vector<StreamParams> streams_;
     76 };
     77 
     78 }  // namespace cricket
     79 
     80 #endif  // TALK_SESSION_MEDIA_BUNDLEFILTER_H_
     81