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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}
68 lines
2.6 KiB
C++
68 lines
2.6 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/rapid_resync_request.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 RapidResyncRequest::kFeedbackMessageType;
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// RFC 4585: Feedback format.
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// Rapid Resynchronisation Request (draft-perkins-avt-rapid-rtp-sync-03).
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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=5 | PT=205 | length=2 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC of packet sender |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// | SSRC of media source |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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bool RapidResyncRequest::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) << "Packet payload size should be "
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<< kCommonFeedbackLength << " instead of "
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<< packet.payload_size_bytes()
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<< " to be a valid Rapid Resynchronisation Request";
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return false;
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}
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ParseCommonFeedback(packet.payload());
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return true;
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}
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size_t RapidResyncRequest::BlockLength() const {
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return kHeaderLength + kCommonFeedbackLength;
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}
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bool RapidResyncRequest::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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CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet,
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index);
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CreateCommonFeedback(packet + *index);
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*index += kCommonFeedbackLength;
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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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