| /* |
| * Copyright (c) 2014 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.h" |
| |
| #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h" |
| #include "webrtc/system_wrappers/interface/logging.h" |
| |
| using webrtc::RTCPUtility::PT_BYE; |
| using webrtc::RTCPUtility::PT_PSFB; |
| using webrtc::RTCPUtility::PT_RR; |
| using webrtc::RTCPUtility::PT_RTPFB; |
| using webrtc::RTCPUtility::PT_SR; |
| |
| using webrtc::RTCPUtility::RTCPPacketBYE; |
| using webrtc::RTCPUtility::RTCPPacketPSFBFIR; |
| using webrtc::RTCPUtility::RTCPPacketPSFBFIRItem; |
| using webrtc::RTCPUtility::RTCPPacketPSFBRPSI; |
| using webrtc::RTCPUtility::RTCPPacketReportBlockItem; |
| using webrtc::RTCPUtility::RTCPPacketRR; |
| using webrtc::RTCPUtility::RTCPPacketRTPFBNACK; |
| using webrtc::RTCPUtility::RTCPPacketRTPFBNACKItem; |
| using webrtc::RTCPUtility::RTCPPacketSR; |
| |
| namespace webrtc { |
| namespace rtcp { |
| namespace { |
| // Unused SSRC of media source, set to 0. |
| const uint32_t kUnusedMediaSourceSsrc0 = 0; |
| |
| void AssignUWord8(uint8_t* buffer, uint16_t* offset, uint8_t value) { |
| buffer[(*offset)++] = value; |
| } |
| void AssignUWord16(uint8_t* buffer, uint16_t* offset, uint16_t value) { |
| ModuleRTPUtility::AssignUWord16ToBuffer(buffer + *offset, value); |
| *offset += 2; |
| } |
| void AssignUWord24(uint8_t* buffer, uint16_t* offset, uint32_t value) { |
| ModuleRTPUtility::AssignUWord24ToBuffer(buffer + *offset, value); |
| *offset += 3; |
| } |
| void AssignUWord32(uint8_t* buffer, uint16_t* offset, uint32_t value) { |
| ModuleRTPUtility::AssignUWord32ToBuffer(buffer + *offset, value); |
| *offset += 4; |
| } |
| |
| uint16_t BlockToHeaderLength(uint16_t length_in_bytes) { |
| // Length in 32-bit words minus 1. |
| assert(length_in_bytes > 0); |
| assert(length_in_bytes % 4 == 0); |
| return (length_in_bytes / 4) - 1; |
| } |
| |
| // From RFC 3550, RTP: A Transport Protocol for Real-Time Applications. |
| // |
| // RTP header 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| RC/FMT | PT | length | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| void CreateHeader(uint8_t count_or_format, // Depends on packet type. |
| uint8_t packet_type, |
| uint16_t length, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| const uint8_t kVersion = 2; |
| AssignUWord8(buffer, pos, (kVersion << 6) + count_or_format); |
| AssignUWord8(buffer, pos, packet_type); |
| AssignUWord16(buffer, pos, length); |
| } |
| |
| // Sender report (SR) (RFC 3550). |
| // 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| RC | PT=SR=200 | length | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | SSRC of sender | |
| // +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ |
| // | NTP timestamp, most significant word | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | NTP timestamp, least significant word | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | RTP timestamp | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | sender's packet count | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | sender's octet count | |
| // +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ |
| |
| void CreateSenderReport(const RTCPPacketSR& sr, |
| uint16_t length, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| CreateHeader(sr.NumberOfReportBlocks, PT_SR, length, buffer, pos); |
| AssignUWord32(buffer, pos, sr.SenderSSRC); |
| AssignUWord32(buffer, pos, sr.NTPMostSignificant); |
| AssignUWord32(buffer, pos, sr.NTPLeastSignificant); |
| AssignUWord32(buffer, pos, sr.RTPTimestamp); |
| AssignUWord32(buffer, pos, sr.SenderPacketCount); |
| AssignUWord32(buffer, pos, sr.SenderOctetCount); |
| } |
| |
| // Receiver report (RR), header (RFC 3550). |
| // |
| // 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| RC | PT=RR=201 | length | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | SSRC of packet sender | |
| // +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ |
| |
| void CreateReceiverReport(const RTCPPacketRR& rr, |
| uint16_t length, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| CreateHeader(rr.NumberOfReportBlocks, PT_RR, length, buffer, pos); |
| AssignUWord32(buffer, pos, rr.SenderSSRC); |
| } |
| |
| // Report block (RFC 3550). |
| // |
| // 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 |
| // +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ |
| // | SSRC_1 (SSRC of first source) | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | fraction lost | cumulative number of packets lost | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | extended highest sequence number received | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | interarrival jitter | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | last SR (LSR) | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | delay since last SR (DLSR) | |
| // +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ |
| |
| void CreateReportBlock(const RTCPPacketReportBlockItem& report_block, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| AssignUWord32(buffer, pos, report_block.SSRC); |
| AssignUWord8(buffer, pos, report_block.FractionLost); |
| AssignUWord24(buffer, pos, report_block.CumulativeNumOfPacketsLost); |
| AssignUWord32(buffer, pos, report_block.ExtendedHighestSequenceNumber); |
| AssignUWord32(buffer, pos, report_block.Jitter); |
| AssignUWord32(buffer, pos, report_block.LastSR); |
| AssignUWord32(buffer, pos, report_block.DelayLastSR); |
| } |
| |
| // Bye packet (BYE) (RFC 3550). |
| // |
| // 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| SC | PT=BYE=203 | length | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | SSRC/CSRC | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // : ... : |
| // +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ |
| // (opt) | length | reason for leaving ... |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| void CreateBye(const RTCPPacketBYE& bye, |
| const std::vector<uint32_t>& csrcs, |
| uint16_t length, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| CreateHeader(length, PT_BYE, length, buffer, pos); |
| AssignUWord32(buffer, pos, bye.SenderSSRC); |
| for (std::vector<uint32_t>::const_iterator it = csrcs.begin(); |
| it != csrcs.end(); ++it) { |
| AssignUWord32(buffer, pos, *it); |
| } |
| } |
| |
| // 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) : |
| // : |
| // |
| |
| // Generic NACK (RFC 4585). |
| // |
| // FCI: |
| // |
| // 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 |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | PID | BLP | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| void CreateNack(const RTCPPacketRTPFBNACK& nack, |
| const std::vector<RTCPPacketRTPFBNACKItem>& nack_fields, |
| uint16_t length, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| const uint8_t kFmt = 1; |
| CreateHeader(kFmt, PT_RTPFB, length, buffer, pos); |
| AssignUWord32(buffer, pos, nack.SenderSSRC); |
| AssignUWord32(buffer, pos, nack.MediaSSRC); |
| for (std::vector<RTCPPacketRTPFBNACKItem>::const_iterator |
| it = nack_fields.begin(); it != nack_fields.end(); ++it) { |
| AssignUWord16(buffer, pos, (*it).PacketID); |
| AssignUWord16(buffer, pos, (*it).BitMask); |
| } |
| } |
| |
| // Reference picture selection indication (RPSI) (RFC 4585). |
| // |
| // FCI: |
| // |
| // 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 |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | PB |0| Payload Type| Native RPSI bit string | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | defined per codec ... | Padding (0) | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| void CreateRpsi(const RTCPPacketPSFBRPSI& rpsi, |
| uint8_t padding_bytes, |
| uint16_t length, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| // Native bit string should be a multiple of 8 bits. |
| assert(rpsi.NumberOfValidBits % 8 == 0); |
| const uint8_t kFmt = 3; |
| CreateHeader(kFmt, PT_PSFB, length, buffer, pos); |
| AssignUWord32(buffer, pos, rpsi.SenderSSRC); |
| AssignUWord32(buffer, pos, rpsi.MediaSSRC); |
| AssignUWord8(buffer, pos, padding_bytes * 8); |
| AssignUWord8(buffer, pos, rpsi.PayloadType); |
| memcpy(buffer + *pos, rpsi.NativeBitString, rpsi.NumberOfValidBits / 8); |
| *pos += rpsi.NumberOfValidBits / 8; |
| memset(buffer + *pos, 0, padding_bytes); |
| *pos += padding_bytes; |
| } |
| |
| // Full intra request (FIR) (RFC 5104). |
| // |
| // FCI: |
| // |
| // 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 |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | SSRC | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| // | Seq nr. | Reserved | |
| // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
| void CreateFir(const RTCPPacketPSFBFIR& fir, |
| const RTCPPacketPSFBFIRItem& fir_item, |
| uint16_t length, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| const uint8_t kFmt = 4; |
| CreateHeader(kFmt, PT_PSFB, length, buffer, pos); |
| AssignUWord32(buffer, pos, fir.SenderSSRC); |
| AssignUWord32(buffer, pos, kUnusedMediaSourceSsrc0); |
| AssignUWord32(buffer, pos, fir_item.SSRC); |
| AssignUWord8(buffer, pos, fir_item.CommandSequenceNumber); |
| AssignUWord24(buffer, pos, 0); |
| } |
| |
| template <typename T> |
| void AppendBlocks(const std::vector<T*>& blocks, |
| uint8_t* buffer, |
| uint16_t* pos) { |
| for (typename std::vector<T*>::const_iterator it = blocks.begin(); |
| it != blocks.end(); ++it) { |
| (*it)->Create(buffer, pos); |
| } |
| } |
| } // namespace |
| |
| void RtcpPacket::Append(RtcpPacket* packet) { |
| assert(packet); |
| appended_packets_.push_back(packet); |
| } |
| |
| RawPacket RtcpPacket::Build() const { |
| uint16_t len = 0; |
| uint8_t packet[IP_PACKET_SIZE]; |
| CreateAndAddAppended(packet, &len, IP_PACKET_SIZE); |
| return RawPacket(packet, len); |
| } |
| |
| void RtcpPacket::Build(uint8_t* packet, uint16_t* len, uint16_t max_len) const { |
| *len = 0; |
| CreateAndAddAppended(packet, len, max_len); |
| } |
| |
| void RtcpPacket::CreateAndAddAppended(uint8_t* packet, |
| uint16_t* len, |
| uint16_t max_len) const { |
| Create(packet, len, max_len); |
| for (std::vector<RtcpPacket*>::const_iterator it = appended_packets_.begin(); |
| it != appended_packets_.end(); ++it) { |
| (*it)->CreateAndAddAppended(packet, len, max_len); |
| } |
| } |
| |
| void Empty::Create(uint8_t* packet, uint16_t* len, uint16_t max_len) const { |
| } |
| |
| void SenderReport::Create(uint8_t* packet, |
| uint16_t* len, |
| uint16_t max_len) const { |
| if (*len + Length() > max_len) { |
| LOG(LS_WARNING) << "Max packet size reached."; |
| return; |
| } |
| CreateSenderReport(sr_, BlockToHeaderLength(Length()), packet, len); |
| AppendBlocks(report_blocks_, packet, len); |
| } |
| |
| void SenderReport::WithReportBlock(ReportBlock* block) { |
| assert(block); |
| if (report_blocks_.size() >= kMaxNumberOfReportBlocks) { |
| LOG(LS_WARNING) << "Max report blocks reached."; |
| return; |
| } |
| report_blocks_.push_back(block); |
| sr_.NumberOfReportBlocks = report_blocks_.size(); |
| } |
| |
| void ReceiverReport::Create(uint8_t* packet, |
| uint16_t* len, |
| uint16_t max_len) const { |
| if (*len + Length() > max_len) { |
| LOG(LS_WARNING) << "Max packet size reached."; |
| return; |
| } |
| CreateReceiverReport(rr_, BlockToHeaderLength(Length()), packet, len); |
| AppendBlocks(report_blocks_, packet, len); |
| } |
| |
| void ReceiverReport::WithReportBlock(ReportBlock* block) { |
| assert(block); |
| if (report_blocks_.size() >= kMaxNumberOfReportBlocks) { |
| LOG(LS_WARNING) << "Max report blocks reached."; |
| return; |
| } |
| report_blocks_.push_back(block); |
| rr_.NumberOfReportBlocks = report_blocks_.size(); |
| } |
| |
| void ReportBlock::Create(uint8_t* packet, uint16_t* len) const { |
| CreateReportBlock(report_block_, packet, len); |
| } |
| |
| void Bye::Create(uint8_t* packet, uint16_t* len, uint16_t max_len) const { |
| if (*len + Length() > max_len) { |
| LOG(LS_WARNING) << "Max packet size reached."; |
| return; |
| } |
| CreateBye(bye_, csrcs_, BlockToHeaderLength(Length()), packet, len); |
| } |
| |
| void Bye::WithCsrc(uint32_t csrc) { |
| if (csrcs_.size() >= kMaxNumberOfCsrcs) { |
| LOG(LS_WARNING) << "Max CSRC size reached."; |
| return; |
| } |
| csrcs_.push_back(csrc); |
| } |
| |
| void Nack::Create(uint8_t* packet, uint16_t* len, uint16_t max_len) const { |
| assert(!nack_fields_.empty()); |
| if (*len + Length() > max_len) { |
| LOG(LS_WARNING) << "Max packet size reached."; |
| return; |
| } |
| CreateNack(nack_, nack_fields_, BlockToHeaderLength(Length()), packet, len); |
| } |
| |
| void Nack::WithList(const uint16_t* nack_list, int length) { |
| assert(nack_list); |
| assert(nack_fields_.empty()); |
| int i = 0; |
| while (i < length) { |
| uint16_t pid = nack_list[i++]; |
| // Bitmask specifies losses in any of the 16 packets following the pid. |
| uint16_t bitmask = 0; |
| while (i < length) { |
| int shift = static_cast<uint16_t>(nack_list[i] - pid) - 1; |
| if (shift >= 0 && shift <= 15) { |
| bitmask |= (1 << shift); |
| ++i; |
| } else { |
| break; |
| } |
| } |
| RTCPUtility::RTCPPacketRTPFBNACKItem item; |
| item.PacketID = pid; |
| item.BitMask = bitmask; |
| nack_fields_.push_back(item); |
| } |
| } |
| |
| void Rpsi::Create(uint8_t* packet, uint16_t* len, uint16_t max_len) const { |
| assert(rpsi_.NumberOfValidBits > 0); |
| if (*len + Length() > max_len) { |
| LOG(LS_WARNING) << "Max packet size reached."; |
| return; |
| } |
| CreateRpsi(rpsi_, padding_bytes_, BlockToHeaderLength(Length()), packet, len); |
| } |
| |
| void Rpsi::WithPictureId(uint64_t picture_id) { |
| const uint32_t kPidBits = 7; |
| const uint64_t k7MsbZeroMask = 0x1ffffffffffffff; |
| uint8_t required_bytes = 0; |
| uint64_t shifted_pid = picture_id; |
| do { |
| ++required_bytes; |
| shifted_pid = (shifted_pid >> kPidBits) & k7MsbZeroMask; |
| } while (shifted_pid > 0); |
| |
| // Convert picture id to native bit string (natively defined by the video |
| // codec). |
| int pos = 0; |
| for (int i = required_bytes - 1; i > 0; i--) { |
| rpsi_.NativeBitString[pos++] = |
| 0x80 | static_cast<uint8_t>(picture_id >> (i * kPidBits)); |
| } |
| rpsi_.NativeBitString[pos++] = static_cast<uint8_t>(picture_id & 0x7f); |
| rpsi_.NumberOfValidBits = pos * 8; |
| |
| // Calculate padding bytes (to reach next 32-bit boundary, 1, 2 or 3 bytes). |
| padding_bytes_ = 4 - ((2 + required_bytes) % 4); |
| if (padding_bytes_ == 4) { |
| padding_bytes_ = 0; |
| } |
| } |
| |
| void Fir::Create(uint8_t* packet, uint16_t* len, uint16_t max_len) const { |
| if (*len + Length() > max_len) { |
| LOG(LS_WARNING) << "Max packet size reached."; |
| return; |
| } |
| CreateFir(fir_, fir_item_, BlockToHeaderLength(Length()), packet, len); |
| } |
| } // namespace rtcp |
| } // namespace webrtc |