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5c3cc41cef
from interface Bug: webrtc:5565 Change-Id: I2df5d7a0554b938888581f1c73dbdb8b85c387cc Reviewed-on: https://webrtc-review.googlesource.com/8680 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21136}
110 lines
4.1 KiB
C++
110 lines
4.1 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 "modules/rtp_rtcp/source/rtcp_packet/tmmbn.h"
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#include "modules/rtp_rtcp/source/byte_io.h"
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#include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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namespace webrtc {
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namespace rtcp {
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constexpr uint8_t Tmmbn::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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// Temporary Maximum Media Stream Bit Rate Notification (TMMBN) (RFC 5104).
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// The Feedback Control Information (FCI) consists of zero, one, or more
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// TMMBN FCI entries.
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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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// | MxTBR Exp | MxTBR Mantissa |Measured Overhead|
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Tmmbn::Tmmbn() = default;
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Tmmbn::~Tmmbn() = default;
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bool Tmmbn::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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if (packet.payload_size_bytes() < kCommonFeedbackLength) {
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RTC_LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes()
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<< " is too small for TMMBN.";
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return false;
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}
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size_t items_size_bytes = packet.payload_size_bytes() - kCommonFeedbackLength;
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if (items_size_bytes % TmmbItem::kLength != 0) {
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RTC_LOG(LS_WARNING) << "Payload length " << packet.payload_size_bytes()
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<< " is not valid for TMMBN.";
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return false;
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}
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ParseCommonFeedback(packet.payload());
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const uint8_t* next_item = packet.payload() + kCommonFeedbackLength;
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size_t number_of_items = items_size_bytes / TmmbItem::kLength;
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items_.resize(number_of_items);
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for (TmmbItem& item : items_) {
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if (!item.Parse(next_item))
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return false;
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next_item += TmmbItem::kLength;
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}
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return true;
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}
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void Tmmbn::AddTmmbr(const TmmbItem& item) {
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items_.push_back(item);
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}
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size_t Tmmbn::BlockLength() const {
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return kHeaderLength + kCommonFeedbackLength +
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TmmbItem::kLength * items_.size();
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}
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bool Tmmbn::Create(uint8_t* packet,
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size_t* index,
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size_t max_length,
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PacketReadyCallback callback) const {
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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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const 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(0, Rtpfb::media_ssrc());
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CreateCommonFeedback(packet + *index);
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*index += kCommonFeedbackLength;
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for (const TmmbItem& item : items_) {
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item.Create(packet + *index);
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*index += TmmbItem::kLength;
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}
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RTC_CHECK_EQ(index_end, *index);
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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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