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/*
* 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_t 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_t 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())) {
LOG(LS_WARNING) << "Stream already added to filter";
return false;
}
streams_.push_back(stream);
return true;
}
bool BundleFilter::RemoveStream(uint32_t ssrc) {
return RemoveStreamBySsrc(&streams_, ssrc);
}
bool BundleFilter::HasStreams() const {
return !streams_.empty();
}
bool BundleFilter::FindStream(uint32_t ssrc) const {
return ssrc == 0 ? false : GetStreamBySsrc(streams_, ssrc) != nullptr;
}
bool BundleFilter::FindPayloadType(int pl_type) const {
return payload_types_.find(pl_type) != payload_types_.end();
}
void BundleFilter::ClearAllPayloadTypes() {
payload_types_.clear();
}
} // namespace cricket
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