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| 1 /* |
| 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #include "webrtc/call/rtp_rtcp_demuxer_helper.h" |
| 12 |
| 13 #include "webrtc/modules/rtp_rtcp/source/byte_io.h" |
| 14 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/bye.h" |
| 15 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h" |
| 16 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_reports.h" |
| 17 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h" |
| 18 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/receiver_report.h" |
| 19 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/rtpfb.h" |
| 20 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/sender_report.h" |
| 21 |
| 22 namespace webrtc { |
| 23 |
| 24 rtc::Optional<uint32_t> ParseRtcpPacketSenderSsrc( |
| 25 rtc::ArrayView<const uint8_t> packet) { |
| 26 rtcp::CommonHeader header; |
| 27 for (const uint8_t* next_packet = packet.begin(); next_packet < packet.end(); |
| 28 next_packet = header.NextPacket()) { |
| 29 if (!header.Parse(next_packet, packet.end() - next_packet)) { |
| 30 return rtc::Optional<uint32_t>(); |
| 31 } |
| 32 |
| 33 switch (header.type()) { |
| 34 case rtcp::Bye::kPacketType: |
| 35 case rtcp::ExtendedReports::kPacketType: |
| 36 case rtcp::Psfb::kPacketType: |
| 37 case rtcp::ReceiverReport::kPacketType: |
| 38 case rtcp::Rtpfb::kPacketType: |
| 39 case rtcp::SenderReport::kPacketType: { |
| 40 // Sender SSRC at the beginning of the RTCP payload. |
| 41 if (header.payload_size_bytes() >= sizeof(uint32_t)) { |
| 42 const uint32_t ssrc_sender = |
| 43 ByteReader<uint32_t>::ReadBigEndian(header.payload()); |
| 44 return rtc::Optional<uint32_t>(ssrc_sender); |
| 45 } else { |
| 46 return rtc::Optional<uint32_t>(); |
| 47 } |
| 48 } |
| 49 } |
| 50 } |
| 51 |
| 52 return rtc::Optional<uint32_t>(); |
| 53 } |
| 54 |
| 55 } // namespace webrtc |
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