|  | /* | 
|  | *  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 <WebRTC/RTCMacros.h> | 
|  | #import <WebRTC/RTCVideoSource.h> | 
|  |  | 
|  | @class AVCaptureSession; | 
|  | @class RTCMediaConstraints; | 
|  | @class RTCPeerConnectionFactory; | 
|  |  | 
|  | NS_ASSUME_NONNULL_BEGIN | 
|  |  | 
|  | /** | 
|  | * RTCAVFoundationVideoSource is a video source that uses | 
|  | * webrtc::AVFoundationVideoCapturer. We do not currently provide a wrapper for | 
|  | * that capturer because cricket::VideoCapturer is not ref counted and we cannot | 
|  | * guarantee its lifetime. Instead, we expose its properties through the ref | 
|  | * counted video source interface. | 
|  | */ | 
|  | RTC_EXPORT | 
|  | @interface RTCAVFoundationVideoSource : RTCVideoSource | 
|  |  | 
|  | - (instancetype)init NS_UNAVAILABLE; | 
|  |  | 
|  | /** Returns whether rear-facing camera is available for use. */ | 
|  | @property(nonatomic, readonly) BOOL canUseBackCamera; | 
|  |  | 
|  | /** Switches the camera being used (either front or back). */ | 
|  | @property(nonatomic, assign) BOOL useBackCamera; | 
|  |  | 
|  | /** Returns the active capture session. */ | 
|  | @property(nonatomic, readonly) AVCaptureSession *captureSession; | 
|  |  | 
|  | @end | 
|  |  | 
|  | NS_ASSUME_NONNULL_END |