[rtcp] Fir/Sli/Rpsi updated not to use RTCPUtility

webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.cc

 /*
  *  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/psfb.h"
 
 #include "webrtc/modules/rtp_rtcp/source/byte_io.h"
 
 namespace webrtc {
 namespace rtcp {
-
+constexpr uint8_t Psfb::kPacketType;
+constexpr size_t Psfb::kCommonFeedbackLength;
 // 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               |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 // 0 |                  SSRC of packet sender                        |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 // 4 |                  SSRC of media source                         |
 //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 //   :            Feedback Control Information (FCI)                 :
 //   :                                                               :
 
 void Psfb::ParseCommonFeedback(const uint8_t* payload) {
   sender_ssrc_ = ByteReader<uint32_t>::ReadBigEndian(&payload[0]);
   media_ssrc_ = ByteReader<uint32_t>::ReadBigEndian(&payload[4]);
 }
 
 void Psfb::CreateCommonFeedback(uint8_t* payload) const {
   ByteWriter<uint32_t>::WriteBigEndian(&payload[0], sender_ssrc_);
   ByteWriter<uint32_t>::WriteBigEndian(&payload[4], media_ssrc_);
 }
 
 }  // namespace rtcp
 }  // namespace webrtc