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_SSRCMUXFILTER_H_
29#define TALK_SESSION_MEDIA_SSRCMUXFILTER_H_
30
31#include <vector>
32
33#include "talk/base/basictypes.h"
34#include "talk/media/base/streamparams.h"
35
36namespace cricket {
37
38// This class maintains list of recv SSRC's destined for cricket::BaseChannel.
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.
44class SsrcMuxFilter {
45 public:
46  SsrcMuxFilter();
47  ~SsrcMuxFilter();
48
49  // Whether the rtp mux is active for a sdp session.
50  // Returns true if the filter contains a stream.
51  bool IsActive() const;
52  // Determines packet belongs to valid cricket::BaseChannel.
53  bool DemuxPacket(const char* data, size_t len, bool rtcp);
54  // Adding a valid source to the filter.
55  bool AddStream(const StreamParams& stream);
56  // Removes source from the filter.
57  bool RemoveStream(uint32 ssrc);
58  // Utility method added for unitest.
59  bool FindStream(uint32 ssrc) const;
60
61 private:
62  std::vector<StreamParams> streams_;
63};
64
65}  // namespace cricket
66
67#endif  // TALK_SESSION_MEDIA_SSRCMUXFILTER_H_
68