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/*
* 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 "webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_jitter_report.h"
#include "webrtc/base/checks.h"
#include "webrtc/base/logging.h"
#include "webrtc/modules/rtp_rtcp/source/byte_io.h"
#include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
using webrtc::RTCPUtility::RtcpCommonHeader;
namespace webrtc {
namespace rtcp {
// Transmission Time Offsets in RTP Streams (RFC 5450).
//
// 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
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// hdr |V=2|P| RC | PT=IJ=195 | length |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | inter-arrival jitter |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// . .
// . .
// . .
// | inter-arrival jitter |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// If present, this RTCP packet must be placed after a receiver report
// (inside a compound RTCP packet), and MUST have the same value for RC
// (reception report count) as the receiver report.
bool ExtendedJitterReport::Parse(const RtcpCommonHeader& header,
const uint8_t* payload) {
RTC_DCHECK(header.packet_type == kPacketType);
const uint8_t jitters_count = header.count_or_format;
const size_t kJitterSizeBytes = 4u;
if (header.payload_size_bytes < jitters_count * kJitterSizeBytes) {
LOG(LS_WARNING) << "Packet is too small to contain all the jitter.";
return false;
}
inter_arrival_jitters_.resize(jitters_count);
for (size_t index = 0; index < jitters_count; ++index) {
inter_arrival_jitters_[index] =
ByteReader<uint32_t>::ReadBigEndian(&payload[index * kJitterSizeBytes]);
}
return true;
}
bool ExtendedJitterReport::WithJitter(uint32_t jitter) {
if (inter_arrival_jitters_.size() >= kMaxNumberOfJitters) {
LOG(LS_WARNING) << "Max inter-arrival jitter items reached.";
return false;
}
inter_arrival_jitters_.push_back(jitter);
return true;
}
bool ExtendedJitterReport::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;
}
const size_t index_end = *index + BlockLength();
size_t length = inter_arrival_jitters_.size();
CreateHeader(length, kPacketType, length, packet, index);
for (uint32_t jitter : inter_arrival_jitters_) {
ByteWriter<uint32_t>::WriteBigEndian(packet + *index, jitter);
*index += sizeof(uint32_t);
}
// Sanity check.
RTC_DCHECK_EQ(index_end, *index);
return true;
}
} // namespace rtcp
} // namespace webrtc
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