Objective C API to read and set RtpParameters

webrtc/api/objc/RTCMediaStreamTrack.mm

 /*
  *  Copyright 2015 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 46 matching lines @@
     (rtc::scoped_refptr<webrtc::MediaStreamTrackInterface>)nativeTrack
                                type:(RTCMediaStreamTrackType)type {
   NSParameterAssert(nativeTrack);
   if (self = [super init]) {
     _nativeTrack = nativeTrack;
     _type = type;
   }
   return self;
 }
 
+- (instancetype)initWithNativeTrack:
+    (rtc::scoped_refptr<webrtc::MediaStreamTrackInterface>)nativeTrack {
+  NSParameterAssert(nativeTrack);
+  if (nativeTrack->kind() ==
+      std::string(webrtc::MediaStreamTrackInterface::kAudioKind)) {
+    return [self initWithNativeTrack:nativeTrack
+                                type:RTCMediaStreamTrackTypeAudio];
+  }
+  if (nativeTrack->kind() ==
+      std::string(webrtc::MediaStreamTrackInterface::kVideoKind)) {
+    return [self initWithNativeTrack:nativeTrack
+                                type:RTCMediaStreamTrackTypeVideo];
+  }
+  return nil;
+}
+
 + (webrtc::MediaStreamTrackInterface::TrackState)nativeTrackStateForState:
     (RTCMediaStreamTrackState)state {
   switch (state) {
     case RTCMediaStreamTrackStateLive:
       return webrtc::MediaStreamTrackInterface::kLive;
     case RTCMediaStreamTrackStateEnded:
       return webrtc::MediaStreamTrackInterface::kEnded;
   }
 }
 
@@ skipping 10 matching lines @@
 + (NSString *)stringForState:(RTCMediaStreamTrackState)state {
   switch (state) {
     case RTCMediaStreamTrackStateLive:
       return @"Live";
     case RTCMediaStreamTrackStateEnded:
       return @"Ended";
   }
 }
 
 @end