diff options
Diffstat (limited to 'webrtc/modules/rtp_rtcp/source/rtcp_packet/pli.cc')
-rw-r--r-- | webrtc/modules/rtp_rtcp/source/rtcp_packet/pli.cc | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet/pli.cc b/webrtc/modules/rtp_rtcp/source/rtcp_packet/pli.cc new file mode 100644 index 0000000000..3673491058 --- /dev/null +++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet/pli.cc @@ -0,0 +1,70 @@ +/* + * Copyright (c) 2015 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/pli.h" + +#include "webrtc/base/checks.h" +#include "webrtc/base/logging.h" + +using webrtc::RTCPUtility::RtcpCommonHeader; + +namespace webrtc { +namespace rtcp { + +// 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 | +// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +// : Feedback Control Information (FCI) : +// : : + +// +// Picture loss indication (PLI) (RFC 4585). +// FCI: no feedback control information. +bool Pli::Parse(const RtcpCommonHeader& header, const uint8_t* payload) { + RTC_DCHECK(header.packet_type == kPacketType); + RTC_DCHECK(header.count_or_format == kFeedbackMessageType); + + if (header.payload_size_bytes < kCommonFeedbackLength) { + LOG(LS_WARNING) << "Packet is too small to be a valid PLI packet"; + return false; + } + + ParseCommonFeedback(payload); + return true; +} + +bool Pli::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 |