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 33 namespace cricket { 34 35 static const uint32 kSsrc01 = 0x01; 36 37 BundleFilter::BundleFilter() { 38 } 39 40 BundleFilter::~BundleFilter() { 41 } 42 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 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 78 void BundleFilter::AddPayloadType(int payload_type) { 79 payload_types_.insert(payload_type); 80 } 81 82 bool 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 91 bool BundleFilter::RemoveStream(uint32 ssrc) { 92 return RemoveStreamBySsrc(&streams_, ssrc); 93 } 94 95 bool BundleFilter::HasStreams() const { 96 return !streams_.empty(); 97 } 98 99 bool BundleFilter::FindStream(uint32 ssrc) const { 100 if (ssrc == 0) { 101 return false; 102 } 103 return (GetStreamBySsrc(streams_, ssrc, NULL)); 104 } 105 106 bool BundleFilter::FindPayloadType(int pl_type) const { 107 return payload_types_.find(pl_type) != payload_types_.end(); 108 } 109 110 void BundleFilter::ClearAllPayloadTypes() { 111 payload_types_.clear(); 112 } 113 114 } // namespace cricket 115