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* Copyright 2004--2011, Google Inc.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "talk/session/phone/ssrcmuxfilter.h"
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#include "talk/base/logging.h"
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#include "talk/session/phone/rtputils.h"
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static const uint32 kSsrc01 = 0x01;
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SsrcMuxFilter::SsrcMuxFilter() {
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SsrcMuxFilter::~SsrcMuxFilter() {
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bool SsrcMuxFilter::IsActive() const {
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return !streams_.empty();
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bool SsrcMuxFilter::DemuxPacket(const char* data, size_t len, bool rtcp) {
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GetRtpSsrc(data, len, &ssrc);
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if (!GetRtcpType(data, len, &pl_type)) return false;
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if (pl_type == kRtcpTypeSDES) {
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// SDES packet parsing not supported.
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LOG(LS_INFO) << "SDES packet received for demux.";
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if (!GetRtcpSsrc(data, len, &ssrc)) return false;
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if (ssrc == kSsrc01) {
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// SSRC 1 has a special meaning and indicates generic feedback on
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// some systems and should never be dropped. If it is forwarded
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// incorrectly it will be ignored by lower layers anyway.
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return FindStream(ssrc);
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bool SsrcMuxFilter::AddStream(const StreamParams& stream) {
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if (GetStreamBySsrc(streams_, stream.first_ssrc(), NULL)) {
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LOG(LS_WARNING) << "Stream already added to filter";
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streams_.push_back(stream);
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bool SsrcMuxFilter::RemoveStream(uint32 ssrc) {
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return RemoveStreamBySsrc(&streams_, ssrc);
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bool SsrcMuxFilter::FindStream(uint32 ssrc) const {
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return (GetStreamBySsrc(streams_, ssrc, NULL));
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} // namespace cricket