blob: 943c2386941368054b429041541dd10fe3d76f05 [file] [log] [blame]
/*
* 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/rapid_resync_request.h"
#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h"
#include "webrtc/rtc_base/checks.h"
#include "webrtc/rtc_base/logging.h"
namespace webrtc {
namespace rtcp {
constexpr uint8_t RapidResyncRequest::kFeedbackMessageType;
// RFC 4585: Feedback format.
// Rapid Resynchronisation Request (draft-perkins-avt-rapid-rtp-sync-03).
//
// 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=5 | PT=205 | length=2 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | SSRC of packet sender |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | SSRC of media source |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
bool RapidResyncRequest::Parse(const CommonHeader& packet) {
RTC_DCHECK_EQ(packet.type(), kPacketType);
RTC_DCHECK_EQ(packet.fmt(), kFeedbackMessageType);
if (packet.payload_size_bytes() != kCommonFeedbackLength) {
LOG(LS_WARNING) << "Packet payload size should be " << kCommonFeedbackLength
<< " instead of " << packet.payload_size_bytes()
<< " to be a valid Rapid Resynchronisation Request";
return false;
}
ParseCommonFeedback(packet.payload());
return true;
}
size_t RapidResyncRequest::BlockLength() const {
return kHeaderLength + kCommonFeedbackLength;
}
bool RapidResyncRequest::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;
}
CreateHeader(kFeedbackMessageType, kPacketType, HeaderLength(), packet,
index);
CreateCommonFeedback(packet + *index);
*index += kCommonFeedbackLength;
return true;
}
} // namespace rtcp
} // namespace webrtc