Building a Native Camera Access Library - Part III.pdf

1. Building Native Camera Access - Part III

2. #import <Foundation/Foundation.h> @interface com_codename1_camerakit_impl_CameraNativeAccessImpl : NSObject { } -(void)start; -(void)stop; -(void)setVideoBitRate:(int)param; -(int)getPreviewWidth; -(BOOL)isStarted; -(void)setMethod:(int)param; -(void*)getView; -(void)setPermissions:(int)param; -(int)getFacing; -(void)setZoom:(float)param; -(int)toggleFacing; -(int)getCaptureWidth; -(float)getHorizontalViewingAngle; -(void)setJpegQuality:(int)param; -(void)stopVideo; -(BOOL)isFacingBack; -(int)getFlash; -(void)captureImage; -(int)getPreviewHeight; -(void)captureVideoFile:(NSString*)param; -(void)setLockVideoAspectRatio:(BOOL)param; -(void)setFocus:(int)param; com_codename1_camerakit_impl_CameraNativeAccessImpl.h

6. #import "com_codename1_camerakit_impl_CameraNativeAccessImpl.h" @implementation com_codename1_camerakit_impl_CameraNativeAccessImpl -(void)start{} -(void)stop{} -(void)setVideoBitRate:(int)param{} -(int)getPreviewWidth{ return 0; } -(BOOL)isStarted{ return NO; } -(void)setMethod:(int)param{} -(void*)getView{ return nil; } -(void)setPermissions:(int)param{} -(int)getFacing{ return 0; } -(void)setZoom:(float)param{} -(int)toggleFacing{ return 0; } com_codename1_camerakit_impl_CameraNativeAccessImpl.m

11. #import <AVFoundation/AVFoundation.h> const int FACING_BACK = 0; const int FACING_FRONT = 1; const int FLASH_OFF = 0; const int FLASH_ON = 1; const int FLASH_AUTO = 2; const int FLASH_TORCH = 3; const int FOCUS_OFF = 0; const int FOCUS_CONTINUOUS = 1; const int FOCUS_TAP = 2; const int FOCUS_TAP_WITH_MARKER = 3; const int METHOD_STANDARD = 0; const int METHOD_STILL = 1; const int VIDEO_QUALITY_480P = 0; const int VIDEO_QUALITY_720P = 1; const int VIDEO_QUALITY_1080P = 2; const int VIDEO_QUALITY_2160P = 3; const int VIDEO_QUALITY_HIGHEST = 4; const int VIDEO_QUALITY_LOWEST = 5; const int VIDEO_QUALITY_QVGA = 6; com_codename1_camerakit_impl_CameraNativeAccessImpl.h

12. BOOL firstTimeCameraKitLaunch = YES; @implementation com_codename1_camerakit_impl_CameraNativeAccessImpl -(void)start{ if(firstTimeCameraKitLaunch) { direction = FACING_BACK; flash = FLASH_OFF; focus = FOCUS_CONTINUOUS; method = METHOD_STANDARD; videoQuality = VIDEO_QUALITY_480P; previewLayer = nil; device = nil; photoOutput = nil; captureSession = nil; stillImageOutput = nil; firstTimeCameraKitLaunch = NO; zoom = 1; [self lazyInit]; } else { dispatch_sync(dispatch_get_main_queue(), ^{ [captureSession startRunning]; }); } } com_codename1_camerakit_impl_CameraNativeAccessImpl.m

17. #import "CameraKitView.h" @interface com_codename1_camerakit_impl_CameraNativeAccessImpl : NSObject { int direction; int flash; int focus; int method; int videoQuality; float zoom; BOOL authorized; BOOL capturingVideo; CameraKitView* container; AVCaptureDevice* device; AVCaptureSession* captureSession; AVCaptureVideoPreviewLayer* previewLayer; AVCaptureMovieFileOutput* movieOutput; AVCapturePhotoOutput* photoOutput; AVCaptureStillImageOutput* stillImageOutput; } com_codename1_camerakit_impl_CameraNativeAccessImpl.h

32. -(void)lazyInit { dispatch_sync(dispatch_get_main_queue(), ^{ container = [[CameraKitView alloc] init]; switch ([AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo]) { case AVAuthorizationStatusNotDetermined: [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^( BOOL granted ) { if ( ! granted ) { authorized = NO; return; } authorized = YES; [self lazyInitPostAuthorization]; }]; break; case AVAuthorizationStatusDenied: case AVAuthorizationStatusRestricted: authorized = NO; break; case AVAuthorizationStatusAuthorized: authorized = YES; [self lazyInitPostAuthorization]; break; } }); } com_codename1_camerakit_impl_CameraNativeAccessImpl.m

40. -(void)lazyInitPostAuthorization { if ([AVCaptureDeviceDiscoverySession class]) { if(direction == FACING_FRONT) { device = [AVCaptureDevice defaultDeviceWithDeviceType: AVCaptureDeviceTypeBuiltInWideAngleCamera mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionFront]; } else { device = [AVCaptureDevice defaultDeviceWithDeviceType: AVCaptureDeviceTypeBuiltInWideAngleCamera mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionBack]; } } else { if(direction == FACING_FRONT) { for(AVCaptureDevice* d in [AVCaptureDevice devices]) { if(d.position == AVCaptureDevicePositionFront) { device = d; break; } com_codename1_camerakit_impl_CameraNativeAccessImpl.m

43. mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionBack]; } } else { if(direction == FACING_FRONT) { for(AVCaptureDevice* d in [AVCaptureDevice devices]) { if(d.position == AVCaptureDevicePositionFront) { device = d; break; } } } else { for(AVCaptureDevice* d in [AVCaptureDevice devices]) { if(d.position == AVCaptureDevicePositionBack) { device = d; break; } } } } // ... common device code ... } com_codename1_camerakit_impl_CameraNativeAccessImpl.m

44. mediaType:AVMediaTypeVideo position:AVCaptureDevicePositionBack]; } } else { if(direction == FACING_FRONT) { for(AVCaptureDevice* d in [AVCaptureDevice devices]) { if(d.position == AVCaptureDevicePositionFront) { device = d; break; } } } else { for(AVCaptureDevice* d in [AVCaptureDevice devices]) { if(d.position == AVCaptureDevicePositionBack) { device = d; break; } } } } // ... common device code ... } com_codename1_camerakit_impl_CameraNativeAccessImpl.m

45. NSError *error = nil; AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error]; captureSession = [[AVCaptureSession alloc] init]; [captureSession addInput:input]; previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession]; previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [container setLayer:previewLayer]; [container.layer addSublayer:previewLayer]; [self updateFlash]; [self updateZoom]; [self updateFocus]; [self updateVideoQuality]; [captureSession startRunning]; com_codename1_camerakit_impl_CameraNativeAccessImpl.m

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Building a Native Camera Access Library - Part III.pdf