Revert of Remove RTPPayloadStrategy and simplify RTPPayloadRegistry

webrtc/modules/rtp_rtcp/source/rtp_utility.h

 /*
  *  Copyright (c) 2012 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 18 matching lines @@
 ReceiveStatistics* NullObjectReceiveStatistics();
 
 namespace RtpUtility {
 
 struct Payload {
   char name[RTP_PAYLOAD_NAME_SIZE];
   bool audio;
   PayloadUnion typeSpecific;
 };
 
+typedef std::map<int8_t, Payload*> PayloadTypeMap;
+
 bool StringCompare(const char* str1, const char* str2, const uint32_t length);
 
 // Round up to the nearest size that is a multiple of 4.
 size_t Word32Align(size_t size);
 
 class RtpHeaderParser {
  public:
   RtpHeaderParser(const uint8_t* rtpData, size_t rtpDataLength);
   ~RtpHeaderParser();
 
   bool RTCP() const;
   bool ParseRtcp(RTPHeader* header) const;
   bool Parse(RTPHeader* parsedPacket,
              RtpHeaderExtensionMap* ptrExtensionMap = nullptr) const;
 
  private:
   void ParseOneByteExtensionHeader(RTPHeader* parsedPacket,
                                    const RtpHeaderExtensionMap* ptrExtensionMap,
                                    const uint8_t* ptrRTPDataExtensionEnd,
                                    const uint8_t* ptr) const;
 
   const uint8_t* const _ptrRTPDataBegin;
   const uint8_t* const _ptrRTPDataEnd;
 };
 }  // namespace RtpUtility
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_UTILITY_H_