| /* | |
| * Copyright (c) 2015 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 "modules/rtp_rtcp/source/rtcp_packet/psfb.h" | |
| #include "modules/rtp_rtcp/source/byte_io.h" | |
| namespace webrtc { | |
| namespace rtcp { | |
| constexpr uint8_t Psfb::kPacketType; | |
| constexpr uint8_t Psfb::kAfbMessageType; | |
| constexpr size_t Psfb::kCommonFeedbackLength; | |
| // RFC 4585: Feedback format. | |
| // | |
| // Common packet format: | |
| // | |
| // 0 1 2 3 | |
| // 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 | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| // |V=2|P| FMT | PT | length | | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| // 0 | SSRC of packet sender | | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| // 4 | SSRC of media source | | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| // : Feedback Control Information (FCI) : | |
| // : : | |
| void Psfb::ParseCommonFeedback(const uint8_t* payload) { | |
| SetSenderSsrc(ByteReader<uint32_t>::ReadBigEndian(&payload[0])); | |
| SetMediaSsrc(ByteReader<uint32_t>::ReadBigEndian(&payload[4])); | |
| } | |
| void Psfb::CreateCommonFeedback(uint8_t* payload) const { | |
| ByteWriter<uint32_t>::WriteBigEndian(&payload[0], sender_ssrc()); | |
| ByteWriter<uint32_t>::WriteBigEndian(&payload[4], media_ssrc()); | |
| } | |
| } // namespace rtcp | |
| } // namespace webrtc |