diff options
Diffstat (limited to 'third_party/libwebrtc/sdk/objc/helpers/AVCaptureSession+DevicePosition.mm')
-rw-r--r-- | third_party/libwebrtc/sdk/objc/helpers/AVCaptureSession+DevicePosition.mm | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/third_party/libwebrtc/sdk/objc/helpers/AVCaptureSession+DevicePosition.mm b/third_party/libwebrtc/sdk/objc/helpers/AVCaptureSession+DevicePosition.mm new file mode 100644 index 0000000000..0814ecc6c5 --- /dev/null +++ b/third_party/libwebrtc/sdk/objc/helpers/AVCaptureSession+DevicePosition.mm @@ -0,0 +1,51 @@ +/* + * 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 "AVCaptureSession+DevicePosition.h" + +BOOL CFStringContainsString(CFStringRef theString, CFStringRef stringToFind) { + return CFStringFindWithOptions(theString, + stringToFind, + CFRangeMake(0, CFStringGetLength(theString)), + kCFCompareCaseInsensitive, + nil); +} + +@implementation AVCaptureSession (DevicePosition) + ++ (AVCaptureDevicePosition)devicePositionForSampleBuffer:(CMSampleBufferRef)sampleBuffer { + // Check the image's EXIF for the camera the image came from. + AVCaptureDevicePosition cameraPosition = AVCaptureDevicePositionUnspecified; + CFDictionaryRef attachments = CMCopyDictionaryOfAttachments( + kCFAllocatorDefault, sampleBuffer, kCMAttachmentMode_ShouldPropagate); + if (attachments) { + int size = CFDictionaryGetCount(attachments); + if (size > 0) { + CFDictionaryRef cfExifDictVal = nil; + if (CFDictionaryGetValueIfPresent( + attachments, (const void *)CFSTR("{Exif}"), (const void **)&cfExifDictVal)) { + CFStringRef cfLensModelStrVal; + if (CFDictionaryGetValueIfPresent(cfExifDictVal, + (const void *)CFSTR("LensModel"), + (const void **)&cfLensModelStrVal)) { + if (CFStringContainsString(cfLensModelStrVal, CFSTR("front"))) { + cameraPosition = AVCaptureDevicePositionFront; + } else if (CFStringContainsString(cfLensModelStrVal, CFSTR("back"))) { + cameraPosition = AVCaptureDevicePositionBack; + } + } + } + } + CFRelease(attachments); + } + return cameraPosition; +} + +@end |