RtpPacket class introduced.

webrtc/modules/rtp_rtcp/source/rtp_header_extension.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 52 matching lines @@
     }
   }
 
   const RTPExtensionType type;
   uint8_t length;
   bool active;
 };
 
 class RtpHeaderExtensionMap {
  public:
+  static constexpr RTPExtensionType kInvalidType = kRtpExtensionNone;
+  static constexpr uint8_t kInvalidId = 0;
   RtpHeaderExtensionMap();
   ~RtpHeaderExtensionMap();
 
   void Erase();
 
   int32_t Register(const RTPExtensionType type, const uint8_t id);
 
   // Active is a concept for a registered rtp header extension which doesn't
   // take effect yet until being activated. Inactive RTP header extensions do
   // not take effect and should not be included in size calculations until they
   // are activated.
   int32_t RegisterInactive(const RTPExtensionType type, const uint8_t id);
   bool SetActive(const RTPExtensionType type, bool active);
 
   int32_t Deregister(const RTPExtensionType type);
 
   bool IsRegistered(RTPExtensionType type) const;
 
   int32_t GetType(const uint8_t id, RTPExtensionType* type) const;
+  // Return kInvalidType if not found.
+  RTPExtensionType GetType(uint8_t id) const;
 
   int32_t GetId(const RTPExtensionType type, uint8_t* id) const;
+  // Return kInvalidId if not found.
+  uint8_t GetId(RTPExtensionType type) const;
 
   //
   // Methods below ignore any inactive rtp header extensions.
   //
 
   size_t GetTotalLengthInBytes() const;
 
   int32_t GetLengthUntilBlockStartInBytes(const RTPExtensionType type) const;
 
   void GetCopy(RtpHeaderExtensionMap* map) const;
 
   int32_t Size() const;
 
   RTPExtensionType First() const;
 
   RTPExtensionType Next(RTPExtensionType type) const;
 
  private:
   int32_t Register(const RTPExtensionType type, const uint8_t id, bool active);
   std::map<uint8_t, HeaderExtension*> extensionMap_;
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSION_H_