1 files changed, 116 insertions, 0 deletions
diff --git a/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDCaptureController.m b/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDCaptureController.m
new file mode 100644
index 0000000000..26cce9fdaa
--- /dev/null
+++ b/third_party/libwebrtc/examples/objc/AppRTCMobile/ARDCaptureController.m
@@ -0,0 +1,116 @@
+/*
+ *  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 "ARDCaptureController.h"
+
+#import "sdk/objc/base/RTCLogging.h"
+
+#import "ARDSettingsModel.h"
+
+const Float64 kFramerateLimit = 30.0;
+
+@implementation ARDCaptureController {
+  RTC_OBJC_TYPE(RTCCameraVideoCapturer) * _capturer;
+  ARDSettingsModel *_settings;
+  BOOL _usingFrontCamera;
+}
+
+- (instancetype)initWithCapturer:(RTC_OBJC_TYPE(RTCCameraVideoCapturer) *)capturer
+                        settings:(ARDSettingsModel *)settings {
+  if (self = [super init]) {
+    _capturer = capturer;
+    _settings = settings;
+    _usingFrontCamera = YES;
+  }
+
+  return self;
+}
+
+- (void)startCapture {
+  [self startCapture:nil];
+}
+
+- (void)startCapture:(void (^)(NSError *))completion {
+  AVCaptureDevicePosition position =
+      _usingFrontCamera ? AVCaptureDevicePositionFront : AVCaptureDevicePositionBack;
+  AVCaptureDevice *device = [self findDeviceForPosition:position];
+  AVCaptureDeviceFormat *format = [self selectFormatForDevice:device];
+
+  if (format == nil) {
+    RTCLogError(@"No valid formats for device %@", device);
+    NSAssert(NO, @"");
+
+    return;
+  }
+
+  NSInteger fps = [self selectFpsForFormat:format];
+
+  [_capturer startCaptureWithDevice:device format:format fps:fps completionHandler:completion];
+}
+
+- (void)stopCapture {
+  [_capturer stopCapture];
+}
+
+- (void)switchCamera {
+  _usingFrontCamera = !_usingFrontCamera;
+  [self startCapture:nil];
+}
+
+- (void)switchCamera:(void (^)(NSError *))completion {
+  _usingFrontCamera = !_usingFrontCamera;
+  [self startCapture:completion];
+}
+
+#pragma mark - Private
+
+- (AVCaptureDevice *)findDeviceForPosition:(AVCaptureDevicePosition)position {
+  NSArray<AVCaptureDevice *> *captureDevices =
+      [RTC_OBJC_TYPE(RTCCameraVideoCapturer) captureDevices];
+  for (AVCaptureDevice *device in captureDevices) {
+    if (device.position == position) {
+      return device;
+    }
+  }
+  return captureDevices[0];
+}
+
+- (AVCaptureDeviceFormat *)selectFormatForDevice:(AVCaptureDevice *)device {
+  NSArray<AVCaptureDeviceFormat *> *formats =
+      [RTC_OBJC_TYPE(RTCCameraVideoCapturer) supportedFormatsForDevice:device];
+  int targetWidth = [_settings currentVideoResolutionWidthFromStore];
+  int targetHeight = [_settings currentVideoResolutionHeightFromStore];
+  AVCaptureDeviceFormat *selectedFormat = nil;
+  int currentDiff = INT_MAX;
+
+  for (AVCaptureDeviceFormat *format in formats) {
+    CMVideoDimensions dimension = CMVideoFormatDescriptionGetDimensions(format.formatDescription);
+    FourCharCode pixelFormat = CMFormatDescriptionGetMediaSubType(format.formatDescription);
+    int diff = abs(targetWidth - dimension.width) + abs(targetHeight - dimension.height);
+    if (diff < currentDiff) {
+      selectedFormat = format;
+      currentDiff = diff;
+    } else if (diff == currentDiff && pixelFormat == [_capturer preferredOutputPixelFormat]) {
+      selectedFormat = format;
+    }
+  }
+
+  return selectedFormat;
+}
+
+- (NSInteger)selectFpsForFormat:(AVCaptureDeviceFormat *)format {
+  Float64 maxSupportedFramerate = 0;
+  for (AVFrameRateRange *fpsRange in format.videoSupportedFrameRateRanges) {
+    maxSupportedFramerate = fmax(maxSupportedFramerate, fpsRange.maxFrameRate);
+  }
+  return fmin(maxSupportedFramerate, kFramerateLimit);
+}
+
+@end