Revert of Delete Rtx-related methods from RTPPayloadRegistry.

webrtc/modules/rtp_rtcp/include/rtp_payload_registry.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 35 matching lines @@
                              int8_t* payload_type) const;
 
   bool RtxEnabled() const;
 
   void SetRtxSsrc(uint32_t ssrc);
 
   bool GetRtxSsrc(uint32_t* ssrc) const;
 
   void SetRtxPayloadType(int payload_type, int associated_payload_type);
 
+  bool IsRtx(const RTPHeader& header) const;
+
+  bool RestoreOriginalPacket(uint8_t* restored_packet,
+                             const uint8_t* packet,
+                             size_t* packet_length,
+                             uint32_t original_ssrc,
+                             const RTPHeader& header);
+
   bool IsRed(const RTPHeader& header) const;
 
+  // Returns true if the media of this RTP packet is encapsulated within an
+  // extra header, such as RTX or RED.
+  bool IsEncapsulated(const RTPHeader& header) const;
+
   bool GetPayloadSpecifics(uint8_t payload_type, PayloadUnion* payload) const;
 
   int GetPayloadTypeFrequency(uint8_t payload_type) const;
 
   const RtpUtility::Payload* PayloadTypeToPayload(uint8_t payload_type) const;
 
   void ResetLastReceivedPayloadTypes() {
     rtc::CritScope cs(&crit_sect_);
     last_received_payload_type_ = -1;
     last_received_media_payload_type_ = -1;
@@ skipping 52 matching lines @@
   // video, DCHECK that no instance is used for both audio and video.
 #if RTC_DCHECK_IS_ON
   bool used_for_audio_ GUARDED_BY(crit_sect_) = false;
   bool used_for_video_ GUARDED_BY(crit_sect_) = false;
 #endif
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_INCLUDE_RTP_PAYLOAD_REGISTRY_H_