| /* |
| * 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 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) { |
| sender_ssrc_ = ByteReader<uint32_t>::ReadBigEndian(&payload[0]); |
| media_ssrc_ = 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 |
