af476c737f
There's no longer any need to make the two arguments have the same signedness, so we can drop the "u" suffix on literal integer arguments. NOPRESUBMIT=true BUG=webrtc:6645 Review-Url: https://codereview.webrtc.org/2535593002 Cr-Commit-Position: refs/heads/master@{#15280}
103 lines
4.0 KiB
C++
103 lines
4.0 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|
|
|
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
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);
|
|
}
|
|
|
|
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
|