Build dynamic iOS SDK.

webrtc/base/objc/RTCCameraPreviewView.m

-/*
- *  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.
- */
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-#import "webrtc/base/objc/RTCCameraPreviewView.h"
-
-#import <AVFoundation/AVFoundation.h>
-
-#import "webrtc/base/objc/RTCDispatcher.h"
-
-@implementation RTCCameraPreviewView
-
-@synthesize captureSession = _captureSession;
-
-+ (Class)layerClass {
-  return [AVCaptureVideoPreviewLayer class];
-}
-
-- (void)setCaptureSession:(AVCaptureSession *)captureSession {
-  if (_captureSession == captureSession) {
-    return;
-  }
-  _captureSession = captureSession;
-  AVCaptureVideoPreviewLayer *previewLayer = [self previewLayer];
-  [RTCDispatcher dispatchAsyncOnType:RTCDispatcherTypeCaptureSession
-                               block:^{
-    previewLayer.session = captureSession;
-  }];
-}
-
-#pragma mark - Private
-
-- (AVCaptureVideoPreviewLayer *)previewLayer {
-  return (AVCaptureVideoPreviewLayer *)self.layer;
-}
-
-@end