Return a copy of the supported RTP header extensions instead of a reference.

talk/media/base/mediaengine.h

 /*
  * libjingle
  * Copyright 2004 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 39 matching lines @@
 #endif
 
 namespace webrtc {
 class Call;
 }
 
 namespace cricket {
 
 class VideoCapturer;
 
+struct RtpCapabilities {
+  std::vector<RtpHeaderExtension> header_extensions;
+};
+
 // MediaEngineInterface is an abstraction of a media engine which can be
 // subclassed to support different media componentry backends.
 // It supports voice and video operations in the same class to facilitate
 // proper synchronization between both media types.
 class MediaEngineInterface {
  public:
   virtual ~MediaEngineInterface() {}
 
   // Initialization
   // Starts the engine.
@@ skipping 31 matching lines @@
   // Device configuration
   // Gets the current speaker volume, as a value between 0 and 255.
   virtual bool GetOutputVolume(int* level) = 0;
   // Sets the current speaker volume, as a value between 0 and 255.
   virtual bool SetOutputVolume(int level) = 0;
 
   // Gets the current microphone level, as a value between 0 and 10.
   virtual int GetInputLevel() = 0;
 
   virtual const std::vector<AudioCodec>& audio_codecs() = 0;
-  virtual const std::vector<RtpHeaderExtension>&
-      audio_rtp_header_extensions() = 0;
+  virtual RtpCapabilities GetAudioCapabilities() = 0;
   virtual const std::vector<VideoCodec>& video_codecs() = 0;
-  virtual const std::vector<RtpHeaderExtension>&
-      video_rtp_header_extensions() = 0;
+  virtual RtpCapabilities GetVideoCapabilities() = 0;
 
   // Starts AEC dump using existing file.
   virtual bool StartAecDump(rtc::PlatformFile file) = 0;
 
   // Stops recording AEC dump.
   virtual void StopAecDump() = 0;
 
   // Starts RtcEventLog using existing file.
   virtual bool StartRtcEventLog(rtc::PlatformFile file) = 0;
 
@@ skipping 69 matching lines @@
   virtual bool SetOutputVolume(int level) {
     return voice_.SetOutputVolume(level);
   }
 
   virtual int GetInputLevel() {
     return voice_.GetInputLevel();
   }
   virtual const std::vector<AudioCodec>& audio_codecs() {
     return voice_.codecs();
   }
-  virtual const std::vector<RtpHeaderExtension>& audio_rtp_header_extensions() {
-    return voice_.rtp_header_extensions();
+  virtual RtpCapabilities GetAudioCapabilities() {
+    return voice_.GetCapabilities();
   }
   virtual const std::vector<VideoCodec>& video_codecs() {
     return video_.codecs();
   }
-  virtual const std::vector<RtpHeaderExtension>& video_rtp_header_extensions() {
-    return video_.rtp_header_extensions();
+  virtual RtpCapabilities GetVideoCapabilities() {
+    return video_.GetCapabilities();
   }
 
   virtual bool StartAecDump(rtc::PlatformFile file) {
     return voice_.StartAecDump(file);
   }
 
   virtual void StopAecDump() {
     voice_.StopAecDump();
   }
 
@@ skipping 17 matching lines @@
 class DataEngineInterface {
  public:
   virtual ~DataEngineInterface() {}
   virtual DataMediaChannel* CreateChannel(DataChannelType type) = 0;
   virtual const std::vector<DataCodec>& data_codecs() = 0;
 };
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_BASE_MEDIAENGINE_H_