3 * Copyright 2004 Google Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
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11 * this list of conditions and the following disclaimer in the documentation
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28 #include "talk/session/media/ssrcmuxfilter.h"
32 #include "talk/base/logging.h"
33 #include "talk/media/base/rtputils.h"
37 static const uint32 kSsrc01 = 0x01;
39 SsrcMuxFilter::SsrcMuxFilter() {
42 SsrcMuxFilter::~SsrcMuxFilter() {
45 bool SsrcMuxFilter::IsActive() const {
46 return !streams_.empty();
49 bool SsrcMuxFilter::DemuxPacket(const char* data, size_t len, bool rtcp) {
52 GetRtpSsrc(data, len, &ssrc);
55 if (!GetRtcpType(data, len, &pl_type)) return false;
56 if (pl_type == kRtcpTypeSDES) {
57 // SDES packet parsing not supported.
58 LOG(LS_INFO) << "SDES packet received for demux.";
61 if (!GetRtcpSsrc(data, len, &ssrc)) return false;
62 if (ssrc == kSsrc01) {
63 // SSRC 1 has a special meaning and indicates generic feedback on
64 // some systems and should never be dropped. If it is forwarded
65 // incorrectly it will be ignored by lower layers anyway.
70 return FindStream(ssrc);
73 bool SsrcMuxFilter::AddStream(const StreamParams& stream) {
74 if (GetStreamBySsrc(streams_, stream.first_ssrc(), NULL)) {
75 LOG(LS_WARNING) << "Stream already added to filter";
78 streams_.push_back(stream);
82 bool SsrcMuxFilter::RemoveStream(uint32 ssrc) {
83 return RemoveStreamBySsrc(&streams_, ssrc);
86 bool SsrcMuxFilter::FindStream(uint32 ssrc) const {
90 return (GetStreamBySsrc(streams_, ssrc, NULL));
93 } // namespace cricket