| /* |
| * libjingle |
| * Copyright 2004 Google Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * 3. The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
| * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
| * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "talk/session/media/bundlefilter.h" |
| |
| #include "talk/media/base/rtputils.h" |
| #include "webrtc/base/logging.h" |
| |
| namespace cricket { |
| |
| static const uint32 kSsrc01 = 0x01; |
| |
| BundleFilter::BundleFilter() { |
| } |
| |
| BundleFilter::~BundleFilter() { |
| } |
| |
| bool BundleFilter::DemuxPacket(const char* data, size_t len, bool rtcp) { |
| // For rtp packets, we check whether the payload type can be found. |
| // For rtcp packets, we check whether the ssrc can be found or is the special |
| // value 1 except for SDES packets which always pass through. Plus, if |
| // |streams_| is empty, we will allow all rtcp packets pass through provided |
| // that they are valid rtcp packets in case that they are for early media. |
| if (!rtcp) { |
| // It may not be a RTP packet (e.g. SCTP). |
| if (!IsRtpPacket(data, len)) |
| return false; |
| |
| int payload_type = 0; |
| if (!GetRtpPayloadType(data, len, &payload_type)) { |
| return false; |
| } |
| return FindPayloadType(payload_type); |
| } |
| |
| // Rtcp packets using ssrc filter. |
| int pl_type = 0; |
| uint32 ssrc = 0; |
| if (!GetRtcpType(data, len, &pl_type)) return false; |
| if (pl_type == kRtcpTypeSDES) { |
| // SDES packet parsing not supported. |
| LOG(LS_INFO) << "SDES packet received for demux."; |
| return true; |
| } else { |
| if (!GetRtcpSsrc(data, len, &ssrc)) return false; |
| if (ssrc == kSsrc01) { |
| // SSRC 1 has a special meaning and indicates generic feedback on |
| // some systems and should never be dropped. If it is forwarded |
| // incorrectly it will be ignored by lower layers anyway. |
| return true; |
| } |
| } |
| // Pass through if |streams_| is empty to allow early rtcp packets in. |
| return !HasStreams() || FindStream(ssrc); |
| } |
| |
| void BundleFilter::AddPayloadType(int payload_type) { |
| payload_types_.insert(payload_type); |
| } |
| |
| bool BundleFilter::AddStream(const StreamParams& stream) { |
| if (GetStreamBySsrc(streams_, stream.first_ssrc(), NULL)) { |
| LOG(LS_WARNING) << "Stream already added to filter"; |
| return false; |
| } |
| streams_.push_back(stream); |
| return true; |
| } |
| |
| bool BundleFilter::RemoveStream(uint32 ssrc) { |
| return RemoveStreamBySsrc(&streams_, ssrc); |
| } |
| |
| bool BundleFilter::HasStreams() const { |
| return !streams_.empty(); |
| } |
| |
| bool BundleFilter::FindStream(uint32 ssrc) const { |
| if (ssrc == 0) { |
| return false; |
| } |
| return (GetStreamBySsrc(streams_, ssrc, NULL)); |
| } |
| |
| bool BundleFilter::FindPayloadType(int pl_type) const { |
| return payload_types_.find(pl_type) != payload_types_.end(); |
| } |
| |
| void BundleFilter::ClearAllPayloadTypes() { |
| payload_types_.clear(); |
| } |
| |
| } // namespace cricket |