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/*
* Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "call/rtp_rtcp_demuxer_helper.h"
#include "modules/rtp_rtcp/source/byte_io.h"
#include "modules/rtp_rtcp/source/rtcp_packet/bye.h"
#include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
#include "modules/rtp_rtcp/source/rtcp_packet/extended_reports.h"
#include "modules/rtp_rtcp/source/rtcp_packet/psfb.h"
#include "modules/rtp_rtcp/source/rtcp_packet/receiver_report.h"
#include "modules/rtp_rtcp/source/rtcp_packet/rtpfb.h"
#include "modules/rtp_rtcp/source/rtcp_packet/sender_report.h"
namespace webrtc {
absl::optional<uint32_t> ParseRtcpPacketSenderSsrc(
rtc::ArrayView<const uint8_t> packet) {
rtcp::CommonHeader header;
for (const uint8_t* next_packet = packet.begin(); next_packet < packet.end();
next_packet = header.NextPacket()) {
if (!header.Parse(next_packet, packet.end() - next_packet)) {
return absl::nullopt;
}
switch (header.type()) {
case rtcp::Bye::kPacketType:
case rtcp::ExtendedReports::kPacketType:
case rtcp::Psfb::kPacketType:
case rtcp::ReceiverReport::kPacketType:
case rtcp::Rtpfb::kPacketType:
case rtcp::SenderReport::kPacketType: {
// Sender SSRC at the beginning of the RTCP payload.
if (header.payload_size_bytes() >= sizeof(uint32_t)) {
const uint32_t ssrc_sender =
ByteReader<uint32_t>::ReadBigEndian(header.payload());
return ssrc_sender;
} else {
return absl::nullopt;
}
}
}
}
return absl::nullopt;
}
} // namespace webrtc
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