psfb.cc (1843B)
1 /* 2 * Copyright (c) 2015 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 "modules/rtp_rtcp/source/rtcp_packet/psfb.h" 12 13 #include <cstdint> 14 15 #include "modules/rtp_rtcp/source/byte_io.h" 16 17 namespace webrtc { 18 namespace rtcp { 19 // RFC 4585: Feedback format. 20 // 21 // Common packet format: 22 // 23 // 0 1 2 3 24 // 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 25 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 26 // |V=2|P| FMT | PT | length | 27 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 28 // 0 | SSRC of packet sender | 29 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 30 // 4 | SSRC of media source | 31 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 32 // : Feedback Control Information (FCI) : 33 // : : 34 35 void Psfb::ParseCommonFeedback(const uint8_t* payload) { 36 SetSenderSsrc(ByteReader<uint32_t>::ReadBigEndian(&payload[0])); 37 SetMediaSsrc(ByteReader<uint32_t>::ReadBigEndian(&payload[4])); 38 } 39 40 void Psfb::CreateCommonFeedback(uint8_t* payload) const { 41 ByteWriter<uint32_t>::WriteBigEndian(&payload[0], sender_ssrc()); 42 ByteWriter<uint32_t>::WriteBigEndian(&payload[4], media_ssrc()); 43 } 44 45 } // namespace rtcp 46 } // namespace webrtc