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/media/base/rtputils.h"
31 #include "webrtc/base/logging.h"
32
33 namespace cricket {
34
35 static const uint32 kSsrc01 = 0x01;
36
BundleFilter()37 BundleFilter::BundleFilter() {
38 }
39
~BundleFilter()40 BundleFilter::~BundleFilter() {
41 }
42
DemuxPacket(const char * data,size_t len,bool rtcp)43 bool 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 // It may not be a RTP packet (e.g. SCTP).
51 if (!IsRtpPacket(data, len))
52 return false;
53
54 int payload_type = 0;
55 if (!GetRtpPayloadType(data, len, &payload_type)) {
56 return false;
57 }
58 return FindPayloadType(payload_type);
59 }
60
61 // Rtcp packets using ssrc filter.
62 int pl_type = 0;
63 uint32 ssrc = 0;
64 if (!GetRtcpType(data, len, &pl_type)) return false;
65 if (pl_type == kRtcpTypeSDES) {
66 // SDES packet parsing not supported.
67 LOG(LS_INFO) << "SDES packet received for demux.";
68 return true;
69 } else {
70 if (!GetRtcpSsrc(data, len, &ssrc)) return false;
71 if (ssrc == kSsrc01) {
72 // SSRC 1 has a special meaning and indicates generic feedback on
73 // some systems and should never be dropped. If it is forwarded
74 // incorrectly it will be ignored by lower layers anyway.
75 return true;
76 }
77 }
78 // Pass through if |streams_| is empty to allow early rtcp packets in.
79 return !HasStreams() || FindStream(ssrc);
80 }
81
AddPayloadType(int payload_type)82 void BundleFilter::AddPayloadType(int payload_type) {
83 payload_types_.insert(payload_type);
84 }
85
AddStream(const StreamParams & stream)86 bool BundleFilter::AddStream(const StreamParams& stream) {
87 if (GetStreamBySsrc(streams_, stream.first_ssrc(), NULL)) {
88 LOG(LS_WARNING) << "Stream already added to filter";
89 return false;
90 }
91 streams_.push_back(stream);
92 return true;
93 }
94
RemoveStream(uint32 ssrc)95 bool BundleFilter::RemoveStream(uint32 ssrc) {
96 return RemoveStreamBySsrc(&streams_, ssrc);
97 }
98
HasStreams() const99 bool BundleFilter::HasStreams() const {
100 return !streams_.empty();
101 }
102
FindStream(uint32 ssrc) const103 bool BundleFilter::FindStream(uint32 ssrc) const {
104 if (ssrc == 0) {
105 return false;
106 }
107 return (GetStreamBySsrc(streams_, ssrc, NULL));
108 }
109
FindPayloadType(int pl_type) const110 bool BundleFilter::FindPayloadType(int pl_type) const {
111 return payload_types_.find(pl_type) != payload_types_.end();
112 }
113
ClearAllPayloadTypes()114 void BundleFilter::ClearAllPayloadTypes() {
115 payload_types_.clear();
116 }
117
118 } // namespace cricket
119