[rtp_rtcp] rtcp::Fir moved into own file

webrtc/modules/rtp_rtcp/source/rtcp_packet.cc

Index: webrtc/modules/rtp_rtcp/source/rtcp_packet.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtcp_packet.cc b/webrtc/modules/rtp_rtcp/source/rtcp_packet.cc
index eef29783714ac73cd672e57e9e133aa65820b85a..906255990f8f8b8ab313f5ef3b9ffa8262404704 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_packet.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_packet.cc
@@ -30,8 +30,6 @@ using webrtc::RTCPUtility::PT_XR;
 
 using webrtc::RTCPUtility::RTCPPacketAPP;
 using webrtc::RTCPUtility::RTCPPacketPSFBAPP;
-using webrtc::RTCPUtility::RTCPPacketPSFBFIR;
-using webrtc::RTCPUtility::RTCPPacketPSFBFIRItem;
 using webrtc::RTCPUtility::RTCPPacketPSFBREMBItem;
 using webrtc::RTCPUtility::RTCPPacketPSFBRPSI;
 using webrtc::RTCPUtility::RTCPPacketReportBlockItem;
@@ -54,10 +52,6 @@ void AssignUWord16(uint8_t* buffer, size_t* offset, uint16_t value) {
   ByteWriter<uint16_t>::WriteBigEndian(buffer + *offset, value);
   *offset += 2;
 }
-void AssignUWord24(uint8_t* buffer, size_t* offset, uint32_t value) {
-  ByteWriter<uint32_t, 3>::WriteBigEndian(buffer + *offset, value);
-  *offset += 3;
-}
 void AssignUWord32(uint8_t* buffer, size_t* offset, uint32_t value) {
   ByteWriter<uint32_t>::WriteBigEndian(buffer + *offset, value);
   *offset += 4;
@@ -207,29 +201,6 @@ void CreateRpsi(const RTCPPacketPSFBRPSI& rpsi,
   *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,
-               uint8_t* buffer,
-               size_t* 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);
-}
-
 // Receiver Estimated Max Bitrate (REMB) (draft-alvestrand-rmcat-remb).
 //
 //    0                   1                   2                   3
@@ -499,20 +470,6 @@ void Rpsi::WithPictureId(uint64_t picture_id) {
   }
 }
 
-bool Fir::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;
-  }
-  const uint8_t kFmt = 4;
-  CreateHeader(kFmt, PT_PSFB, HeaderLength(), packet, index);
-  CreateFir(fir_, fir_item_, packet, index);
-  return true;
-}
-
 bool Remb::Create(uint8_t* packet,
                   size_t* index,
                   size_t max_length,