blob: 185011dff19fe1b0f9ac27dbfde482b967602e20 [file] [log] [blame]
/*
* 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/receiver_report.h"
#include <utility>
#include "modules/rtp_rtcp/source/byte_io.h"
#include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
namespace rtcp {
constexpr uint8_t ReceiverReport::kPacketType;
constexpr size_t ReceiverReport::kMaxNumberOfReportBlocks;
// RTCP receiver report (RFC 3550).
//
// 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| RC | PT=RR=201 | length |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | SSRC of packet sender |
// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
// | report block(s) |
// | .... |
ReceiverReport::ReceiverReport() = default;
ReceiverReport::ReceiverReport(const ReceiverReport& rhs) = default;
ReceiverReport::~ReceiverReport() = default;
bool ReceiverReport::Parse(const CommonHeader& packet) {
RTC_DCHECK_EQ(packet.type(), kPacketType);
const uint8_t report_blocks_count = packet.count();
if (packet.payload_size_bytes() <
kRrBaseLength + report_blocks_count * ReportBlock::kLength) {
RTC_LOG(LS_WARNING) << "Packet is too small to contain all the data.";
return false;
}
SetSenderSsrc(ByteReader<uint32_t>::ReadBigEndian(packet.payload()));
const uint8_t* next_report_block = packet.payload() + kRrBaseLength;
report_blocks_.resize(report_blocks_count);
for (ReportBlock& block : report_blocks_) {
block.Parse(next_report_block, ReportBlock::kLength);
next_report_block += ReportBlock::kLength;
}
RTC_DCHECK_LE(next_report_block - packet.payload(),
static_cast<ptrdiff_t>(packet.payload_size_bytes()));
return true;
}
size_t ReceiverReport::BlockLength() const {
return kHeaderLength + kRrBaseLength +
report_blocks_.size() * ReportBlock::kLength;
}
bool ReceiverReport::Create(uint8_t* packet,
size_t* index,
size_t max_length,
PacketReadyCallback callback) const {
while (*index + BlockLength() > max_length) {
if (!OnBufferFull(packet, index, callback))
return false;
}
CreateHeader(report_blocks_.size(), kPacketType, HeaderLength(), packet,
index);
ByteWriter<uint32_t>::WriteBigEndian(packet + *index, sender_ssrc());
*index += kRrBaseLength;
for (const ReportBlock& block : report_blocks_) {
block.Create(packet + *index);
*index += ReportBlock::kLength;
}
return true;
}
bool ReceiverReport::AddReportBlock(const ReportBlock& block) {
if (report_blocks_.size() >= kMaxNumberOfReportBlocks) {
RTC_LOG(LS_WARNING) << "Max report blocks reached.";
return false;
}
report_blocks_.push_back(block);
return true;
}
bool ReceiverReport::SetReportBlocks(std::vector<ReportBlock> blocks) {
if (blocks.size() > kMaxNumberOfReportBlocks) {
RTC_LOG(LS_WARNING) << "Too many report blocks (" << blocks.size()
<< ") for receiver report.";
return false;
}
report_blocks_ = std::move(blocks);
return true;
}
} // namespace rtcp
} // namespace webrtc