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 "modules/rtp_rtcp/source/byte_io.h" 14 15 namespace webrtc { 16 namespace rtcp { 17 constexpr uint8_t Psfb::kPacketType; 18 constexpr uint8_t Psfb::kAfbMessageType; 19 constexpr size_t Psfb::kCommonFeedbackLength; 20 // RFC 4585: Feedback format. 21 // 22 // Common packet format: 23 // 24 // 0 1 2 3 25 // 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 26 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 27 // |V=2|P| FMT | PT | length | 28 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 29 // 0 | SSRC of packet sender | 30 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 31 // 4 | SSRC of media source | 32 // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 33 // : Feedback Control Information (FCI) : 34 // : : 35 ParseCommonFeedback(const uint8_t * payload)36void Psfb::ParseCommonFeedback(const uint8_t* payload) { 37 SetSenderSsrc(ByteReader<uint32_t>::ReadBigEndian(&payload[0])); 38 SetMediaSsrc(ByteReader<uint32_t>::ReadBigEndian(&payload[4])); 39 } 40 CreateCommonFeedback(uint8_t * payload) const41void Psfb::CreateCommonFeedback(uint8_t* payload) const { 42 ByteWriter<uint32_t>::WriteBigEndian(&payload[0], sender_ssrc()); 43 ByteWriter<uint32_t>::WriteBigEndian(&payload[4], media_ssrc()); 44 } 45 46 } // namespace rtcp 47 } // namespace webrtc 48