8fa21c49ef
1. To make the files conform to chromium-style guidelines, and stop the compiler from complaing: 1.1. Move constructors out of .h file. 1.2. Move destructors out of .h file. 1.3. Move virtual functions out of .h file. 2. BlockLength() and Create() did not have consistent access modifiers in the various subclasses of RtcpPacket. Change the access level to public throughout. 3. Reorder BlockLength() and Create() where necessary, to reflect the order defined in the parent class (RtcpPacket). BUG=None Review-Url: https://codereview.webrtc.org/2937403002 Cr-Commit-Position: refs/heads/master@{#18633}
112 lines
4.3 KiB
C++
112 lines
4.3 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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#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h"
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namespace webrtc {
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namespace rtcp {
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constexpr uint8_t Fir::kFeedbackMessageType;
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// RFC 4585: Feedback format.
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// Common packet format:
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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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// |V=2|P| FMT | PT | length |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC of packet sender |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC of media source (unused) = 0 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// : Feedback Control Information (FCI) :
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// : :
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// Full intra request (FIR) (RFC 5104).
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// The Feedback Control Information (FCI) for the Full Intra Request
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// consists of one or more FCI entries.
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// FCI:
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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 = 0 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Fir::Fir() = default;
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Fir::~Fir() = default;
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bool Fir::Parse(const CommonHeader& packet) {
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RTC_DCHECK_EQ(packet.type(), kPacketType);
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RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType);
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// The FCI field MUST contain one or more FIR entries.
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if (packet.payload_size_bytes() < kCommonFeedbackLength + kFciLength) {
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LOG(LS_WARNING) << "Packet is too small to be a valid FIR packet.";
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return false;
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}
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if ((packet.payload_size_bytes() - kCommonFeedbackLength) % kFciLength != 0) {
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LOG(LS_WARNING) << "Invalid size for a valid FIR packet.";
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return false;
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}
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ParseCommonFeedback(packet.payload());
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size_t number_of_fci_items =
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(packet.payload_size_bytes() - kCommonFeedbackLength) / kFciLength;
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const uint8_t* next_fci = packet.payload() + kCommonFeedbackLength;
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items_.resize(number_of_fci_items);
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for (Request& request : items_) {
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request.ssrc = ByteReader<uint32_t>::ReadBigEndian(next_fci);
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request.seq_nr = ByteReader<uint8_t>::ReadBigEndian(next_fci + 4);
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next_fci += kFciLength;
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}
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return true;
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}
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size_t Fir::BlockLength() const {
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return kHeaderLength + kCommonFeedbackLength + kFciLength * items_.size();
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}
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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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RTC_DCHECK(!items_.empty());
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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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size_t index_end = *index + BlockLength();
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CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet,
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index);
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RTC_DCHECK_EQ(Psfb::media_ssrc(), 0);
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CreateCommonFeedback(packet + *index);
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*index += kCommonFeedbackLength;
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constexpr uint32_t kReserved = 0;
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for (const Request& request : items_) {
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ByteWriter<uint32_t>::WriteBigEndian(packet + *index, request.ssrc);
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ByteWriter<uint8_t>::WriteBigEndian(packet + *index + 4, request.seq_nr);
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ByteWriter<uint32_t, 3>::WriteBigEndian(packet + *index + 5, kReserved);
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*index += kFciLength;
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}
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RTC_CHECK_EQ(*index, index_end);
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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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