Add header extension filtering for WebRtcVoiceEngine/MediaChannel.

talk/media/webrtc/webrtcmediaengine.h

 /*
  * libjingle
  * Copyright 2011 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 10 matching lines @@
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef TALK_MEDIA_WEBRTCMEDIAENGINE_H_
 #define TALK_MEDIA_WEBRTCMEDIAENGINE_H_
 
+#include <string>
+#include <vector>
+
 #include "talk/media/base/mediaengine.h"
+#include "webrtc/config.h"
 
 namespace webrtc {
 class AudioDeviceModule;
 }
 namespace cricket {
 class WebRtcVideoDecoderFactory;
 class WebRtcVideoEncoderFactory;
 }
 
 namespace cricket {
 
 class WebRtcMediaEngineFactory {
  public:
   static MediaEngineInterface* Create(
       webrtc::AudioDeviceModule* adm,
       WebRtcVideoEncoderFactory* encoder_factory,
       WebRtcVideoDecoderFactory* decoder_factory);
 };
 
-extern const char* kBweExtensionPriorities[];
-extern const size_t kBweExtensionPrioritiesLength;
+// Verify that extension IDs are within 1-byte extension range and are not
+// overlapping.
+bool ValidateRtpExtensions(const std::vector<RtpHeaderExtension>& extensions);
 
-std::vector<RtpHeaderExtension> FilterRedundantRtpExtensions(
+// Convert cricket::RtpHeaderExtension:s to webrtc::RtpExtension:s, discarding
+// any extensions not validated by the 'supported' predicate. Duplicate
+// extensions are removed if 'filter_redundant_extensions' is set, and also any
+// mutually exclusive extensions (see implementation for details).
+std::vector<webrtc::RtpExtension> FilterRtpExtensions(
     const std::vector<RtpHeaderExtension>& extensions,
-    const char* extension_prios[],
-    size_t extension_prios_length);
+    bool (*supported)(const std::string&),
+    bool filter_redundant_extensions);
 
 }  // namespace cricket
 
 #endif  // TALK_MEDIA_WEBRTCMEDIAENGINE_H_