5679da1291
Cleaning/Parsing will be done in the https://codereview.webrtc.org/1544403002 BUG=webrtc:5260 R=asapersson@webrtc.org, åsapersson Review URL: https://codereview.webrtc.org/1581983003 . Cr-Commit-Position: refs/heads/master@{#11269}
79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/fir.h"
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#include "webrtc/base/checks.h"
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#include "webrtc/base/logging.h"
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#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
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using webrtc::RTCPUtility::PT_PSFB;
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using webrtc::RTCPUtility::RTCPPacketPSFBFIR;
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using webrtc::RTCPUtility::RTCPPacketPSFBFIRItem;
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namespace webrtc {
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namespace rtcp {
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namespace {
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const uint32_t kUnusedMediaSourceSsrc0 = 0;
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void AssignUWord8(uint8_t* buffer, size_t* offset, uint8_t value) {
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buffer[(*offset)++] = value;
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}
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void AssignUWord24(uint8_t* buffer, size_t* offset, uint32_t value) {
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ByteWriter<uint32_t, 3>::WriteBigEndian(buffer + *offset, value);
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*offset += 3;
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}
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void AssignUWord32(uint8_t* buffer, size_t* offset, uint32_t value) {
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ByteWriter<uint32_t>::WriteBigEndian(buffer + *offset, value);
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*offset += 4;
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}
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// Full intra request (FIR) (RFC 5104).
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//
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// FCI:
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//
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// 0 1 2 3
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// 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
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | Seq nr. | Reserved |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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void CreateFir(const RTCPPacketPSFBFIR& fir,
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const RTCPPacketPSFBFIRItem& fir_item,
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uint8_t* buffer,
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size_t* pos) {
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AssignUWord32(buffer, pos, fir.SenderSSRC);
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AssignUWord32(buffer, pos, kUnusedMediaSourceSsrc0);
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AssignUWord32(buffer, pos, fir_item.SSRC);
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AssignUWord8(buffer, pos, fir_item.CommandSequenceNumber);
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AssignUWord24(buffer, pos, 0);
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}
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} // namespace
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bool Fir::Create(uint8_t* packet,
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size_t* index,
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size_t max_length,
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RtcpPacket::PacketReadyCallback* callback) const {
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while (*index + BlockLength() > max_length) {
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if (!OnBufferFull(packet, index, callback))
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return false;
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}
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const uint8_t kFmt = 4;
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CreateHeader(kFmt, PT_PSFB, HeaderLength(), packet, index);
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CreateFir(fir_, fir_item_, packet, index);
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return true;
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}
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} // namespace rtcp
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} // namespace webrtc
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