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}
113 lines
4.2 KiB
C++
113 lines
4.2 KiB
C++
/*
|
|
* 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/tmmbr.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/rtcp_packet/common_header.h"
|
|
|
|
namespace webrtc {
|
|
namespace rtcp {
|
|
constexpr uint8_t Tmmbr::kFeedbackMessageType;
|
|
// RFC 4585: Feedback format.
|
|
// Common packet format:
|
|
//
|
|
// 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 | PT | length |
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// | SSRC of packet sender |
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// | SSRC of media source (unused) = 0 |
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// : Feedback Control Information (FCI) :
|
|
// : :
|
|
// Temporary Maximum Media Stream Bit Rate Request (TMMBR) (RFC 5104).
|
|
// The Feedback Control Information (FCI) for the TMMBR
|
|
// consists of one or more FCI entries.
|
|
// FCI:
|
|
// 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
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// | SSRC |
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
// | MxTBR Exp | MxTBR Mantissa |Measured Overhead|
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
|
|
Tmmbr::Tmmbr() = default;
|
|
|
|
Tmmbr::~Tmmbr() = default;
|
|
|
|
bool Tmmbr::Parse(const CommonHeader& packet) {
|
|
RTC_DCHECK_EQ(packet.type(), kPacketType);
|
|
RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType);
|
|
|
|
if (packet.payload_size_bytes() < kCommonFeedbackLength + TmmbItem::kLength) {
|
|
LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes()
|
|
<< " is too small for a TMMBR.";
|
|
return false;
|
|
}
|
|
size_t items_size_bytes = packet.payload_size_bytes() - kCommonFeedbackLength;
|
|
if (items_size_bytes % TmmbItem::kLength != 0) {
|
|
LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes()
|
|
<< " is not valid for a TMMBR.";
|
|
return false;
|
|
}
|
|
ParseCommonFeedback(packet.payload());
|
|
|
|
const uint8_t* next_item = packet.payload() + kCommonFeedbackLength;
|
|
size_t number_of_items = items_size_bytes / TmmbItem::kLength;
|
|
items_.resize(number_of_items);
|
|
for (TmmbItem& item : items_) {
|
|
if (!item.Parse(next_item))
|
|
return false;
|
|
next_item += TmmbItem::kLength;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void Tmmbr::AddTmmbr(const TmmbItem& item) {
|
|
items_.push_back(item);
|
|
}
|
|
|
|
size_t Tmmbr::BlockLength() const {
|
|
return kHeaderLength + kCommonFeedbackLength +
|
|
TmmbItem::kLength * items_.size();
|
|
}
|
|
|
|
bool Tmmbr::Create(uint8_t* packet,
|
|
size_t* index,
|
|
size_t max_length,
|
|
RtcpPacket::PacketReadyCallback* callback) const {
|
|
RTC_DCHECK(!items_.empty());
|
|
while (*index + BlockLength() > max_length) {
|
|
if (!OnBufferFull(packet, index, callback))
|
|
return false;
|
|
}
|
|
const size_t index_end = *index + BlockLength();
|
|
|
|
CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet,
|
|
index);
|
|
RTC_DCHECK_EQ(0, Rtpfb::media_ssrc());
|
|
CreateCommonFeedback(packet + *index);
|
|
*index += kCommonFeedbackLength;
|
|
for (const TmmbItem& item : items_) {
|
|
item.Create(packet + *index);
|
|
*index += TmmbItem::kLength;
|
|
}
|
|
RTC_CHECK_EQ(index_end, *index);
|
|
return true;
|
|
}
|
|
} // namespace rtcp
|
|
} // namespace webrtc
|