Reland of Only compare sequence numbers from the same SSRC in ForwardErrorCorrection.

webrtc/modules/rtp_rtcp/include/ulpfec_receiver.h

 /*
  *  Copyright (c) 2013 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.
  */
 
@@ skipping 13 matching lines @@
         first_packet_time_ms(-1) {}
 
   size_t num_packets;            // Number of received packets.
   size_t num_fec_packets;        // Number of received FEC packets.
   size_t num_recovered_packets;  // Number of recovered media packets using FEC.
   int64_t first_packet_time_ms;  // Time when first packet is received.
 };
 
 class UlpfecReceiver {
  public:
-  static UlpfecReceiver* Create(RecoveredPacketReceiver* callback);
+  static UlpfecReceiver* Create(uint32_t ssrc,
+                                RecoveredPacketReceiver* callback);
 
   virtual ~UlpfecReceiver() {}
 
   // Takes a RED packet, strips the RED header, and adds the resulting
   // "virtual" RTP packet(s) into the internal buffer.
   //
   // TODO(brandtr): Set |ulpfec_payload_type| during constructor call,
   // rather than as a parameter here.
   virtual int32_t AddReceivedRedPacket(const RTPHeader& rtp_header,
                                        const uint8_t* incoming_rtp_packet,
                                        size_t packet_length,
                                        uint8_t ulpfec_payload_type) = 0;
 
   // Sends the received packets to the FEC and returns all packets
   // (both original media and recovered) through the callback.
   virtual int32_t ProcessReceivedFec() = 0;
 
   // Returns a counter describing the added and recovered packets.
   virtual FecPacketCounter GetPacketCounter() const = 0;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_ULPFEC_RECEIVER_H_