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* cap_ios_photo_camera.mm
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* by Eduard Feicho on 29/07/12
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* Copyright 2012. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#import "opencv2/videoio/cap_ios.h"
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#include "precomp.hpp"
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#pragma mark - Private Interface
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@interface CvPhotoCamera ()
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@property (nonatomic, retain) AVCaptureStillImageOutput* stillImageOutput;
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#pragma mark - Implementation
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@implementation CvPhotoCamera
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@synthesize stillImageOutput;
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#pragma mark - Public interface
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if (cameraAvailable == NO) {
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[self.stillImageOutput captureStillImageAsynchronouslyFromConnection:self.videoCaptureConnection
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^(CMSampleBufferRef imageSampleBuffer, NSError *error)
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if (error == nil && imageSampleBuffer != NULL)
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// NSNumber* imageOrientation = [UIImage cgImageOrientationForUIDeviceOrientation:currentDeviceOrientation];
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// CMSetAttachment(imageSampleBuffer, kCGImagePropertyOrientation, imageOrientation, 1);
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NSData *jpegData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
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dispatch_async(dispatch_get_main_queue(), ^{
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[self.captureSession stopRunning];
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// Make sure we create objects on the main thread in the main context
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UIImage* newImage = [UIImage imageWithData:jpegData];
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//UIImageOrientation orientation = [newImage imageOrientation];
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// TODO: only apply rotation, don't scale, since we can set this directly in the camera
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switch (orientation) {
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case UIImageOrientationUp:
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case UIImageOrientationDown:
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newImage = [newImage imageWithAppliedRotationAndMaxSize:CGSizeMake(640.0, 480.0)];
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case UIImageOrientationLeft:
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case UIImageOrientationRight:
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newImage = [newImage imageWithMaxSize:CGSizeMake(640.0, 480.0)];
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// We have captured the image, we can allow the user to take another picture
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cameraAvailable = YES;
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NSLog(@"CvPhotoCamera captured image");
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[self.delegate photoCamera:self capturedImage:newImage];
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[self.captureSession startRunning];
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self.stillImageOutput = nil;
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#pragma mark - Private Interface
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- (void)createStillImageOutput;
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// setup still image output with jpeg codec
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self.stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
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NSDictionary *outputSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil];
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[self.stillImageOutput setOutputSettings:outputSettings];
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[self.captureSession addOutput:self.stillImageOutput];
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for (AVCaptureConnection *connection in self.stillImageOutput.connections) {
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for (AVCaptureInputPort *port in [connection inputPorts]) {
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if ([port.mediaType isEqual:AVMediaTypeVideo]) {
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self.videoCaptureConnection = connection;
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if (self.videoCaptureConnection) {
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NSLog(@"[Camera] still image output created");
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- (void)createCaptureOutput;
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[self createStillImageOutput];
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- (void)createCustomVideoPreview;
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//do nothing, always use AVCaptureVideoPreviewLayer