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/rrtr.h"
      12             : 
      13             : #include "webrtc/base/checks.h"
      14             : #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
      15             : 
      16             : namespace webrtc {
      17             : namespace rtcp {
      18             : // Receiver Reference Time Report Block (RFC 3611).
      19             : //
      20             : //   0                   1                   2                   3
      21             : //   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
      22             : //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      23             : //  |     BT=4      |   reserved    |       block length = 2        |
      24             : //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      25             : //  |              NTP timestamp, most significant word             |
      26             : //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      27             : //  |             NTP timestamp, least significant word             |
      28             : //  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      29             : 
      30           0 : void Rrtr::Parse(const uint8_t* buffer) {
      31           0 :   RTC_DCHECK(buffer[0] == kBlockType);
      32             :   // reserved = buffer[1];
      33           0 :   RTC_DCHECK(ByteReader<uint16_t>::ReadBigEndian(&buffer[2]) == kBlockLength);
      34           0 :   uint32_t seconds = ByteReader<uint32_t>::ReadBigEndian(&buffer[4]);
      35           0 :   uint32_t fraction = ByteReader<uint32_t>::ReadBigEndian(&buffer[8]);
      36           0 :   ntp_.Set(seconds, fraction);
      37           0 : }
      38             : 
      39           0 : void Rrtr::Create(uint8_t* buffer) const {
      40           0 :   const uint8_t kReserved = 0;
      41           0 :   buffer[0] = kBlockType;
      42           0 :   buffer[1] = kReserved;
      43           0 :   ByteWriter<uint16_t>::WriteBigEndian(&buffer[2], kBlockLength);
      44           0 :   ByteWriter<uint32_t>::WriteBigEndian(&buffer[4], ntp_.seconds());
      45           0 :   ByteWriter<uint32_t>::WriteBigEndian(&buffer[8], ntp_.fractions());
      46           0 : }
      47             : 
      48             : }  // namespace rtcp
      49             : }  // namespace webrtc