Removed file RTCCameraVideoCapturer.mm that isn't needed

webrtc/sdk/objc/Framework/Classes/PeerConnection/RTCCameraVideoCapturer.m

 /*
  *  Copyright 2017 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 <Foundation/Foundation.h>
 
 #import "WebRTC/RTCCameraVideoCapturer.h"
 #import "WebRTC/RTCLogging.h"
 #import "WebRTC/RTCVideoFrameBuffer.h"
 
 #if TARGET_OS_IPHONE
 #import "WebRTC/UIDevice+RTCDevice.h"
 #endif
 
-#import "AVCaptureSession+Device.h"
+#import "AVCaptureSession+DevicePosition.h"
 #import "RTCDispatcher+Private.h"
 
 const int64_t kNanosecondsPerSecond = 1000000000;
 
 static inline BOOL IsMediaSubTypeSupported(FourCharCode mediaSubType) {
   return (mediaSubType == kCVPixelFormatType_420YpCbCr8PlanarFullRange ||
           mediaSubType == kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange);
 }
 
 @interface RTCCameraVideoCapturer ()<AVCaptureVideoDataOutputSampleBufferDelegate>
@@ skipping 159 matching lines @@
   }
 
   CVPixelBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
   if (pixelBuffer == nil) {
     return;
   }
 
 #if TARGET_OS_IPHONE
   // Default to portrait orientation on iPhone.
   RTCVideoRotation rotation = RTCVideoRotation_90;
-  // Check here, which camera this frame is from, to avoid any race conditions.
-  AVCaptureDeviceInput *deviceInput =
-      (AVCaptureDeviceInput *)((AVCaptureInputPort *)connection.inputPorts.firstObject).input;
-  BOOL usingFrontCamera = deviceInput.device.position == AVCaptureDevicePositionFront;
-  // Check the image's EXIF for the actual camera the image came as the image could have been
+  BOOL usingFrontCamera = NO;
+  // Check the image's EXIF for the camera the image came from as the image could have been
   // delayed as we set alwaysDiscardsLateVideoFrames to NO.
   AVCaptureDevicePosition cameraPosition =
       [AVCaptureSession devicePositionForSampleBuffer:sampleBuffer];
   if (cameraPosition != AVCaptureDevicePositionUnspecified) {
-    usingFrontCamera = cameraPosition == AVCaptureDevicePositionFront;
+    usingFrontCamera = AVCaptureDevicePositionFront == cameraPosition;
+  } else {
+    AVCaptureDeviceInput *deviceInput =
+        (AVCaptureDeviceInput *)((AVCaptureInputPort *)connection.inputPorts.firstObject).input;
+    usingFrontCamera = AVCaptureDevicePositionFront == deviceInput.device.position;
   }
   switch (_orientation) {
     case UIDeviceOrientationPortrait:
       rotation = RTCVideoRotation_90;
       break;
     case UIDeviceOrientationPortraitUpsideDown:
       rotation = RTCVideoRotation_270;
       break;
     case UIDeviceOrientationLandscapeLeft:
       rotation = usingFrontCamera ? RTCVideoRotation_180 : RTCVideoRotation_0;
@@ skipping 217 matching lines @@
 
 - (void)updateOrientation {
   NSAssert([RTCDispatcher isOnQueueForType:RTCDispatcherTypeCaptureSession],
            @"updateOrientation must be called on the capture queue.");
 #if TARGET_OS_IPHONE
   _orientation = [UIDevice currentDevice].orientation;
 #endif
 }
 
 @end