| /* |
| * Copyright (c) 2016 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 "webrtc/modules/rtp_rtcp/source/rtcp_packet/rapid_resync_request.h" |
| |
| #include "webrtc/base/checks.h" |
| #include "webrtc/base/logging.h" |
| |
| using webrtc::RTCPUtility::RtcpCommonHeader; |
| |
| namespace webrtc { |
| namespace rtcp { |
| // RFC 4585: Feedback format. |
| // Rapid Resynchronisation Request (draft-perkins-avt-rapid-rtp-sync-03). |
| // |
| // 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=5 | PT=205 | length=2 | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | SSRC of packet sender | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | SSRC of media source | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| bool RapidResyncRequest::Parse(const RtcpCommonHeader& header, |
| const uint8_t* payload) { |
| RTC_CHECK(header.packet_type == kPacketType); |
| RTC_CHECK(header.count_or_format == kFeedbackMessageType); |
| |
| if (header.payload_size_bytes != kCommonFeedbackLength) { |
| LOG(LS_WARNING) << "Packet payload size should be " << kCommonFeedbackLength |
| << " instead of " << header.payload_size_bytes |
| << " to be a valid Rapid Resynchronisation Request"; |
| return false; |
| } |
| |
| ParseCommonFeedback(payload); |
| return true; |
| } |
| |
| bool RapidResyncRequest::Create( |
| uint8_t* packet, |
| size_t* index, |
| size_t max_length, |
| RtcpPacket::PacketReadyCallback* callback) const { |
| while (*index + BlockLength() > max_length) { |
| if (!OnBufferFull(packet, index, callback)) |
| return false; |
| } |
| |
| CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet, |
| index); |
| CreateCommonFeedback(packet + *index); |
| *index += kCommonFeedbackLength; |
| return true; |
| } |
| } // namespace rtcp |
| } // namespace webrtc |