Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/extended_jitter_report.h"
      12             : 
      13             : #include <utility>
      14             : 
      15             : #include "webrtc/base/checks.h"
      16             : #include "webrtc/base/logging.h"
      17             : #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
      18             : #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/common_header.h"
      19             : 
      20             : namespace webrtc {
      21             : namespace rtcp {
      22             : constexpr uint8_t ExtendedJitterReport::kPacketType;
      23             : // Transmission Time Offsets in RTP Streams (RFC 5450).
      24             : //
      25             : //      0                   1                   2                   3
      26             : //      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
      27             : //     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      28             : // hdr |V=2|P|    RC   |   PT=IJ=195   |             length            |
      29             : //     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      30             : //     |                      inter-arrival jitter                     |
      31             : //     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      32             : //     .                                                               .
      33             : //     .                                                               .
      34             : //     .                                                               .
      35             : //     |                      inter-arrival jitter                     |
      36             : //     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      37             : //
      38             : //  If present, this RTCP packet must be placed after a receiver report
      39             : //  (inside a compound RTCP packet), and MUST have the same value for RC
      40             : //  (reception report count) as the receiver report.
      41             : 
      42           0 : bool ExtendedJitterReport::Parse(const CommonHeader& packet) {
      43           0 :   RTC_DCHECK_EQ(packet.type(), kPacketType);
      44             : 
      45           0 :   const uint8_t number_of_jitters = packet.count();
      46             : 
      47           0 :   if (packet.payload_size_bytes() < number_of_jitters * kJitterSizeBytes) {
      48           0 :     LOG(LS_WARNING) << "Packet is too small to contain all the jitter.";
      49           0 :     return false;
      50             :   }
      51             : 
      52           0 :   inter_arrival_jitters_.resize(number_of_jitters);
      53           0 :   for (size_t index = 0; index < number_of_jitters; ++index) {
      54           0 :     inter_arrival_jitters_[index] = ByteReader<uint32_t>::ReadBigEndian(
      55           0 :         &packet.payload()[index * kJitterSizeBytes]);
      56             :   }
      57             : 
      58           0 :   return true;
      59             : }
      60             : 
      61           0 : bool ExtendedJitterReport::SetJitterValues(std::vector<uint32_t> values) {
      62           0 :   if (values.size() > kMaxNumberOfJitterValues) {
      63           0 :     LOG(LS_WARNING) << "Too many inter-arrival jitter items.";
      64           0 :     return false;
      65             :   }
      66           0 :   inter_arrival_jitters_ = std::move(values);
      67           0 :   return true;
      68             : }
      69             : 
      70           0 : bool ExtendedJitterReport::Create(
      71             :     uint8_t* packet,
      72             :     size_t* index,
      73             :     size_t max_length,
      74             :     RtcpPacket::PacketReadyCallback* callback) const {
      75           0 :   while (*index + BlockLength() > max_length) {
      76           0 :     if (!OnBufferFull(packet, index, callback))
      77           0 :       return false;
      78             :   }
      79           0 :   const size_t index_end = *index + BlockLength();
      80           0 :   size_t length = inter_arrival_jitters_.size();
      81           0 :   CreateHeader(length, kPacketType, length, packet, index);
      82             : 
      83           0 :   for (uint32_t jitter : inter_arrival_jitters_) {
      84           0 :     ByteWriter<uint32_t>::WriteBigEndian(packet + *index, jitter);
      85           0 :     *index += kJitterSizeBytes;
      86             :   }
      87             :   // Sanity check.
      88           0 :   RTC_DCHECK_EQ(index_end, *index);
      89           0 :   return true;
      90             : }
      91             : 
      92             : }  // namespace rtcp
      93             : }  // namespace webrtc