iOS: Add ability to specify audio constraints.

webrtc/sdk/objc/Framework/Classes/RTCMediaSource+Private.h

 /*
- *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *  Copyright 2016 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.
  */
 
-#import "WebRTC/RTCVideoSource.h"
+#import "WebRTC/RTCMediaSource.h"
 
 #include "webrtc/api/mediastreaminterface.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface RTCVideoSource ()
+typedef NS_ENUM(NSInteger, RTCMediaSourceType) {
+  RTCMediaSourceTypeAudio,
+  RTCMediaSourceTypeVideo,
+};
 
-/**
- * The VideoTrackSourceInterface object passed to this RTCVideoSource during
- * construction.
- */
+@interface RTCMediaSource ()
+
 @property(nonatomic, readonly)
-    rtc::scoped_refptr<webrtc::VideoTrackSourceInterface>
-        nativeVideoSource;
+    rtc::scoped_refptr<webrtc::MediaSourceInterface> nativeMediaSource;
 
-/** Initialize an RTCVideoSource from a native VideoTrackSourceInterface. */
-- (instancetype)initWithNativeVideoSource:
-    (rtc::scoped_refptr<webrtc::VideoTrackSourceInterface>)nativeVideoSource
+- (instancetype)initWithNativeMediaSource:
+   (rtc::scoped_refptr<webrtc::MediaSourceInterface>)nativeMediaSource
+                                     type:(RTCMediaSourceType)type
     NS_DESIGNATED_INITIALIZER;
 
 + (webrtc::MediaSourceInterface::SourceState)nativeSourceStateForState:
     (RTCSourceState)state;
 
 + (RTCSourceState)sourceStateForNativeState:
     (webrtc::MediaSourceInterface::SourceState)nativeState;
 
 + (NSString *)stringForState:(RTCSourceState)state;
 
 @end
 
 NS_ASSUME_NONNULL_END