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#include "talk/session/media/bundlefilter.h"
29
30#include "talk/base/logging.h"
31#include "talk/media/base/rtputils.h"
32
33namespace cricket {
34
35static const uint32 kSsrc01 = 0x01;
36
37BundleFilter::BundleFilter() {
38}
39
40BundleFilter::~BundleFilter() {
41}
42
43bool BundleFilter::DemuxPacket(const char* data, size_t len, bool rtcp) {
44  // For rtp packets, we check whether the payload type can be found.
45  // For rtcp packets, we check whether the ssrc can be found or is the special
46  // value 1 except for SDES packets which always pass through. Plus, if
47  // |streams_| is empty, we will allow all rtcp packets pass through provided
48  // that they are valid rtcp packets in case that they are for early media.
49  if (!rtcp) {
50    int payload_type = 0;
51    if (!GetRtpPayloadType(data, len, &payload_type)) {
52      return false;
53    }
54    return FindPayloadType(payload_type);
55  }
56
57  // Rtcp packets using ssrc filter.
58  int pl_type = 0;
59  uint32 ssrc = 0;
60  if (!GetRtcpType(data, len, &pl_type)) return false;
61  if (pl_type == kRtcpTypeSDES) {
62    // SDES packet parsing not supported.
63    LOG(LS_INFO) << "SDES packet received for demux.";
64    return true;
65  } else {
66    if (!GetRtcpSsrc(data, len, &ssrc)) return false;
67    if (ssrc == kSsrc01) {
68      // SSRC 1 has a special meaning and indicates generic feedback on
69      // some systems and should never be dropped.  If it is forwarded
70      // incorrectly it will be ignored by lower layers anyway.
71      return true;
72    }
73  }
74  // Pass through if |streams_| is empty to allow early rtcp packets in.
75  return !HasStreams() || FindStream(ssrc);
76}
77
78void BundleFilter::AddPayloadType(int payload_type) {
79  payload_types_.insert(payload_type);
80}
81
82bool BundleFilter::AddStream(const StreamParams& stream) {
83  if (GetStreamBySsrc(streams_, stream.first_ssrc(), NULL)) {
84      LOG(LS_WARNING) << "Stream already added to filter";
85      return false;
86  }
87  streams_.push_back(stream);
88  return true;
89}
90
91bool BundleFilter::RemoveStream(uint32 ssrc) {
92  return RemoveStreamBySsrc(&streams_, ssrc);
93}
94
95bool BundleFilter::HasStreams() const {
96  return !streams_.empty();
97}
98
99bool BundleFilter::FindStream(uint32 ssrc) const {
100  if (ssrc == 0) {
101    return false;
102  }
103  return (GetStreamBySsrc(streams_, ssrc, NULL));
104}
105
106bool BundleFilter::FindPayloadType(int pl_type) const {
107  return payload_types_.find(pl_type) != payload_types_.end();
108}
109
110void BundleFilter::ClearAllPayloadTypes() {
111  payload_types_.clear();
112}
113
114}  // namespace cricket
115