c20978e581
NOPRESUBMIT=True # cpplint errors that aren't caused by this CL. NOTRY=True NOTREECHECKS=True TBR=kwiberg@webrtc.org, kjellander@webrtc.org Bug: webrtc:7634 Change-Id: I3cca0fbaa807b563c95979cccd6d1bec32055f36 Reviewed-on: https://chromium-review.googlesource.com/562156 Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Cr-Commit-Position: refs/heads/master@{#18919}
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
/*
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* Copyright (c) 2015 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 "webrtc/modules/rtp_rtcp/source/rtcp_packet/pli.h"
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#include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h"
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#include "webrtc/rtc_base/checks.h"
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#include "webrtc/rtc_base/logging.h"
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namespace webrtc {
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namespace rtcp {
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constexpr uint8_t Pli::kFeedbackMessageType;
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// RFC 4585: Feedback format.
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//
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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 |
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// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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// : Feedback Control Information (FCI) :
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// : :
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//
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// Picture loss indication (PLI) (RFC 4585).
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// FCI: no feedback control information.
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bool Pli::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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LOG(LS_WARNING) << "Packet is too small to be a valid PLI packet";
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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 Pli::BlockLength() const {
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return kHeaderLength + kCommonFeedbackLength;
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}
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bool Pli::Create(uint8_t* packet,
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size_t* index,
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size_t max_length,
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RtcpPacket::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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