Move RTCAVFoundationCapturer to webrtc/api/objc.

webrtc/api/objc/RTCAVFoundationVideoSource.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.
+ */
+
+#import "RTCAVFoundationVideoSource+Private.h"
+
+#import "webrtc/api/objc/RTCMediaConstraints+Private.h"
+#import "webrtc/api/objc/RTCPeerConnectionFactory+Private.h"
+#import "webrtc/api/objc/RTCVideoSource+Private.h"
+
+@implementation RTCAVFoundationVideoSource
+
+- (instancetype)initWithFactory:(RTCPeerConnectionFactory *)factory
+                    constraints:(RTCMediaConstraints *)constraints {
+  NSParameterAssert(factory);
+  rtc::scoped_ptr<webrtc::AVFoundationVideoCapturer> capturer;
+  capturer.reset(new webrtc::AVFoundationVideoCapturer());
+  rtc::scoped_refptr<webrtc::VideoSourceInterface> source =
+      factory.nativeFactory->CreateVideoSource(capturer.release(),
+          constraints.nativeConstraints.get());
+  return [super initWithNativeVideoSource:source];
+}
+
+- (BOOL)useBackCamera {
+  return self.capturer->GetUseBackCamera();
+}
+
+- (void)setUseBackCamera:(BOOL)useBackCamera {
+  self.capturer->SetUseBackCamera(useBackCamera);
+}
+
+- (AVCaptureSession *)captureSession {
+  return self.capturer->GetCaptureSession();
+}
+
+- (webrtc::AVFoundationVideoCapturer *)capturer {
+  cricket::VideoCapturer *capturer = self.nativeVideoSource->GetVideoCapturer();
+  // This should be safe because no one should have changed the underlying video
+  // source.
+  webrtc::AVFoundationVideoCapturer *foundationCapturer =
+      static_cast<webrtc::AVFoundationVideoCapturer *>(capturer);
+  return foundationCapturer;
+}
+
+@end