modules/highgui/src/cap_ios_photo_camera.mm

   1 /*
   2  *  cap_ios_photo_camera.mm
   3  *  For iOS video I/O
   4  *  by Eduard Feicho on 29/07/12
   5  *  Copyright 2012. All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright notice,
  11  *    this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright notice,
  13  *    this list of conditions and the following disclaimer in the documentation
  14  *    and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
  21  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  23  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  24  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  25  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  27  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  */
  30
  31
  32 #import "opencv2/highgui/cap_ios.h"
  33 #include "precomp.hpp"
  34
  35 #pragma mark - Private Interface
  36
  37
  38 @interface CvPhotoCamera ()
  39
  40 @property (nonatomic, retain) AVCaptureStillImageOutput* stillImageOutput;
  41
  42 @end
  43
  44
  45
  46 #pragma mark - Implementation
  47
  48
  49 @implementation CvPhotoCamera
  50
  51
  52
  53 #pragma mark Public
  54
  55 @synthesize stillImageOutput;
  56 @synthesize delegate;
  57
  58
  59 #pragma mark - Public interface
  60
  61
  62 - (void)takePicture
  63 {
  64     if (cameraAvailable == NO) {
  65         return;
  66     }
  67     cameraAvailable = NO;
  68
  69
  70     [self.stillImageOutput captureStillImageAsynchronouslyFromConnection:self.videoCaptureConnection
  71                                                        completionHandler:
  72      ^(CMSampleBufferRef imageSampleBuffer, NSError *error)
  73      {
  74          if (error == nil && imageSampleBuffer != NULL)
  75          {
  76              // TODO check
  77              //                  NSNumber* imageOrientation = [UIImage cgImageOrientationForUIDeviceOrientation:currentDeviceOrientation];
  78              //                  CMSetAttachment(imageSampleBuffer, kCGImagePropertyOrientation, imageOrientation, 1);
  79
  80              NSData *jpegData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];
  81
  82              dispatch_async(dispatch_get_main_queue(), ^{
  83                  [self.captureSession stopRunning];
  84
  85                  // Make sure we create objects on the main thread in the main context
  86                  UIImage* newImage = [UIImage imageWithData:jpegData];
  87
  88                  //UIImageOrientation orientation = [newImage imageOrientation];
  89
  90                  // TODO: only apply rotation, don't scale, since we can set this directly in the camera
  91                  /*
  92                   switch (orientation) {
  93                   case UIImageOrientationUp:
  94                   case UIImageOrientationDown:
  95                   newImage = [newImage imageWithAppliedRotationAndMaxSize:CGSizeMake(640.0, 480.0)];
  96                   break;
  97                   case UIImageOrientationLeft:
  98                   case UIImageOrientationRight:
  99                   newImage = [newImage imageWithMaxSize:CGSizeMake(640.0, 480.0)];
 100                   default:
 101                   break;
 102                   }
 103                   */
 104
 105                  // We have captured the image, we can allow the user to take another picture
 106                  cameraAvailable = YES;
 107
 108                  NSLog(@"CvPhotoCamera captured image");
 109                  if (self.delegate) {
 110                      [self.delegate photoCamera:self capturedImage:newImage];
 111                  }
 112
 113                  [self.captureSession startRunning];
 114              });
 115          }
 116      }];
 117
 118
 119 }
 120
 121 - (void)stop;
 122 {
 123     [super stop];
 124     self.stillImageOutput = nil;
 125 }
 126
 127
 128 #pragma mark - Private Interface
 129
 130
 131 - (void)createStillImageOutput;
 132 {
 133     // setup still image output with jpeg codec
 134     self.stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
 135     NSDictionary *outputSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecJPEG, AVVideoCodecKey, nil];
 136     [self.stillImageOutput setOutputSettings:outputSettings];
 137     [self.captureSession addOutput:self.stillImageOutput];
 138
 139     for (AVCaptureConnection *connection in self.stillImageOutput.connections) {
 140         for (AVCaptureInputPort *port in [connection inputPorts]) {
 141             if ([port.mediaType isEqual:AVMediaTypeVideo]) {
 142                 self.videoCaptureConnection = connection;
 143                 break;
 144             }
 145         }
 146         if (self.videoCaptureConnection) {
 147             break;
 148         }
 149     }
 150     NSLog(@"[Camera] still image output created");
 151 }
 152
 153
 154 - (void)createCaptureOutput;
 155 {
 156     [self createStillImageOutput];
 157 }
 158
 159 - (void)createCustomVideoPreview;
 160 {
 161     //do nothing, always use AVCaptureVideoPreviewLayer
 162 }
 163
 164
 165 @end