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react-native-camera
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react-native-camera/ios/RCTCameraManager.m

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#import "RCTCameraManager.h"
#import "RCTCamera.h"
#import "RCTBridge.h"
#import "RCTEventDispatcher.h"
#import "RCTUtils.h"
#import "RCTLog.h"
#import "UIView+React.h"
#import "NSMutableDictionary+ImageMetadata.m"
#import <AssetsLibrary/ALAssetsLibrary.h>
#import <AVFoundation/AVFoundation.h>
#import <ImageIO/ImageIO.h>
@implementation RCTCameraManager
RCT_EXPORT_MODULE();
- (UIView *)view
{
if(!self.camera){
self.camera = [[RCTCamera alloc] initWithManager:self bridge:self.bridge];
return self.camera;
}
return self.camera;
}
RCT_EXPORT_VIEW_PROPERTY(aspect, NSInteger);
RCT_EXPORT_VIEW_PROPERTY(type, NSInteger);
RCT_EXPORT_VIEW_PROPERTY(orientation, NSInteger);
RCT_EXPORT_VIEW_PROPERTY(flashMode, NSInteger);
RCT_EXPORT_VIEW_PROPERTY(torchMode, NSInteger);
- (NSDictionary *)constantsToExport
{
return @{
@"Aspect": @{
@"stretch": @(RCTCameraAspectStretch),
@"fit": @(RCTCameraAspectFit),
@"fill": @(RCTCameraAspectFill)
},
@"BarCodeType": @{
@"upce": AVMetadataObjectTypeUPCECode,
@"code39": AVMetadataObjectTypeCode39Code,
@"code39mod43": AVMetadataObjectTypeCode39Mod43Code,
@"ean13": AVMetadataObjectTypeEAN13Code,
@"ean8": AVMetadataObjectTypeEAN8Code,
@"code93": AVMetadataObjectTypeCode93Code,
@"code138": AVMetadataObjectTypeCode128Code,
@"pdf417": AVMetadataObjectTypePDF417Code,
@"qr": AVMetadataObjectTypeQRCode,
@"aztec": AVMetadataObjectTypeAztecCode,
@"datamatrix": AVMetadataObjectTypeDataMatrixCode
},
@"Type": @{
@"front": @(RCTCameraTypeFront),
@"back": @(RCTCameraTypeBack)
},
@"CaptureMode": @{
@"still": @(RCTCameraCaptureModeStill),
@"video": @(RCTCameraCaptureModeVideo)
},
@"CaptureTarget": @{
@"memory": @(RCTCameraCaptureTargetMemory),
@"disk": @(RCTCameraCaptureTargetDisk),
@"cameraRoll": @(RCTCameraCaptureTargetCameraRoll)
},
@"Orientation": @{
@"auto": @(RCTCameraOrientationAuto),
@"landscapeLeft": @(RCTCameraOrientationLandscapeLeft),
@"landscapeRight": @(RCTCameraOrientationLandscapeRight),
@"portrait": @(RCTCameraOrientationPortrait),
@"portraitUpsideDown": @(RCTCameraOrientationPortraitUpsideDown)
},
@"FlashMode": @{
@"off": @(RCTCameraFlashModeOff),
@"on": @(RCTCameraFlashModeOn),
@"auto": @(RCTCameraFlashModeAuto)
},
@"TorchMode": @{
@"off": @(RCTCameraTorchModeOff),
@"on": @(RCTCameraTorchModeOn),
@"auto": @(RCTCameraTorchModeAuto)
}
};
}
- (NSArray *)getBarCodeTypes {
return @[
AVMetadataObjectTypeUPCECode,
AVMetadataObjectTypeCode39Code,
AVMetadataObjectTypeCode39Mod43Code,
AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeCode93Code,
AVMetadataObjectTypeCode128Code,
AVMetadataObjectTypePDF417Code,
AVMetadataObjectTypeQRCode,
AVMetadataObjectTypeAztecCode,
AVMetadataObjectTypeDataMatrixCode
];
}
RCT_EXPORT_VIEW_PROPERTY(defaultOnFocusComponent, BOOL);
RCT_EXPORT_VIEW_PROPERTY(onFocusChanged, BOOL)
RCT_EXPORT_VIEW_PROPERTY(onZoomChanged, BOOL)
- (NSArray *)customDirectEventTypes
{
return @[
@"focusChanged",
@"zoomChanged",
];
}
- (id)init {
if ((self = [super init])) {
self.session = [AVCaptureSession new];
self.session.sessionPreset = AVCaptureSessionPresetHigh;
self.previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
self.previewLayer.needsDisplayOnBoundsChange = YES;
self.sessionQueue = dispatch_queue_create("cameraManagerQueue", DISPATCH_QUEUE_SERIAL);
}
return self;
}
RCT_EXPORT_METHOD(checkDeviceAuthorizationStatus:(RCTResponseSenderBlock) callback)
{
NSString *mediaType = AVMediaTypeVideo;
[AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted) {
callback(@[[NSNull null], @(granted)]);
}];
}
RCT_EXPORT_METHOD(changeCamera:(NSInteger)camera) {
dispatch_async(self.sessionQueue, ^{
AVCaptureDevice *currentCaptureDevice = [self.videoCaptureDeviceInput device];
AVCaptureDevicePosition position = (AVCaptureDevicePosition)camera;
AVCaptureDevice *captureDevice = [self deviceWithMediaType:AVMediaTypeVideo preferringPosition:(AVCaptureDevicePosition)position];
if (captureDevice == nil) {
return;
}
self.presetCamera = camera;
NSError *error = nil;
AVCaptureDeviceInput *captureDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
if (error || captureDeviceInput == nil)
{
NSLog(@"%@", error);
return;
}
[self.session beginConfiguration];
[self.session removeInput:self.videoCaptureDeviceInput];
if ([self.session canAddInput:captureDeviceInput])
{
[self.session addInput:captureDeviceInput];
[NSNotificationCenter.defaultCenter removeObserver:self name:AVCaptureDeviceSubjectAreaDidChangeNotification object:currentCaptureDevice];
[NSNotificationCenter.defaultCenter addObserver:self selector:@selector(subjectAreaDidChange:) name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
self.videoCaptureDeviceInput = captureDeviceInput;
}
else
{
[self.session addInput:self.videoCaptureDeviceInput];
}
[self.session commitConfiguration];
});
}
RCT_EXPORT_METHOD(changeAspect:(NSString *)aspect) {
self.previewLayer.videoGravity = aspect;
}
RCT_EXPORT_METHOD(changeFlashMode:(NSInteger)flashMode) {
AVCaptureDevice *device = [self.videoCaptureDeviceInput device];
NSError *error = nil;
if (![device hasFlash]) return;
if (![device lockForConfiguration:&error]) {
NSLog(@"%@", error);
return;
}
[self setFlashMode:flashMode forDevice:device];
[device unlockForConfiguration];
}
RCT_EXPORT_METHOD(changeOrientation:(NSInteger)orientation) {
self.previewLayer.connection.videoOrientation = orientation;
}
RCT_EXPORT_METHOD(changeTorchMode:(NSInteger)torchMode) {
AVCaptureDevice *device = [self.videoCaptureDeviceInput device];
NSError *error = nil;
if (![device hasTorch]) return;
if (![device lockForConfiguration:&error]) {
NSLog(@"%@", error);
return;
}
[device setTorchMode: torchMode];
[device unlockForConfiguration];
}
RCT_EXPORT_METHOD(capture:(NSDictionary *)options callback:(RCTResponseSenderBlock)callback) {
NSInteger captureMode = [[options valueForKey:@"mode"] intValue];
NSInteger captureTarget = [[options valueForKey:@"target"] intValue];
if (captureMode == RCTCameraCaptureModeStill) {
[self captureStill:captureTarget options:options callback:callback];
}
else if (captureMode == RCTCameraCaptureModeVideo) {
[self captureVideo:captureTarget options:options callback:callback];
}
}
RCT_EXPORT_METHOD(stopCapture) {
if (self.movieFileOutput.recording) {
[self.movieFileOutput stopRecording];
}
}
- (void)startSession {
#if TARGET_IPHONE_SIMULATOR
return;
#endif
dispatch_async(self.sessionQueue, ^{
if (self.presetCamera == AVCaptureDevicePositionUnspecified) {
self.presetCamera = AVCaptureDevicePositionBack;
}
AVCaptureStillImageOutput *stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
if ([self.session canAddOutput:stillImageOutput])
{
stillImageOutput.outputSettings = @{AVVideoCodecKey : AVVideoCodecJPEG};
[self.session addOutput:stillImageOutput];
self.stillImageOutput = stillImageOutput;
}
AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
if ([self.session canAddOutput:movieFileOutput])
{
[self.session addOutput:movieFileOutput];
self.movieFileOutput = movieFileOutput;
}
AVCaptureMetadataOutput *metadataOutput = [[AVCaptureMetadataOutput alloc] init];
if ([self.session canAddOutput:metadataOutput]) {
[metadataOutput setMetadataObjectsDelegate:self queue:self.sessionQueue];
[self.session addOutput:metadataOutput];
[metadataOutput setMetadataObjectTypes:metadataOutput.availableMetadataObjectTypes];
self.metadataOutput = metadataOutput;
}
__weak RCTCameraManager *weakSelf = self;
[self setRuntimeErrorHandlingObserver:[NSNotificationCenter.defaultCenter addObserverForName:AVCaptureSessionRuntimeErrorNotification object:self.session queue:nil usingBlock:^(NSNotification *note) {
RCTCameraManager *strongSelf = weakSelf;
dispatch_async(strongSelf.sessionQueue, ^{
// Manually restarting the session since it must have been stopped due to an error.
[strongSelf.session startRunning];
});
}]];
[self.session startRunning];
});
}
- (void)stopSession {
#if TARGET_IPHONE_SIMULATOR
return;
#endif
dispatch_async(self.sessionQueue, ^{
self.camera = nil;
[self.previewLayer removeFromSuperlayer];
[self.session stopRunning];
for(AVCaptureInput *input in self.session.inputs) {
[self.session removeInput:input];
}
for(AVCaptureOutput *output in self.session.outputs) {
[self.session removeOutput:output];
}
});
}
- (void)initializeCaptureSessionInput:(NSString *)type {
dispatch_async(self.sessionQueue, ^{
[self.session beginConfiguration];
NSError *error = nil;
AVCaptureDevice *captureDevice;
if (type == AVMediaTypeAudio) {
captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
}
else if (type == AVMediaTypeVideo) {
captureDevice = [self deviceWithMediaType:AVMediaTypeVideo preferringPosition:self.presetCamera];
}
if (captureDevice == nil) {
return;
}
AVCaptureDeviceInput *captureDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
if (error || captureDeviceInput == nil) {
NSLog(@"%@", error);
return;
}
if (type == AVMediaTypeAudio) {
[self.session removeInput:self.audioCaptureDeviceInput];
}
else if (type == AVMediaTypeVideo) {
[self.session removeInput:self.videoCaptureDeviceInput];
}
if ([self.session canAddInput:captureDeviceInput]) {
[self.session addInput:captureDeviceInput];
if (type == AVMediaTypeAudio) {
self.audioCaptureDeviceInput = captureDeviceInput;
}
else if (type == AVMediaTypeVideo) {
self.videoCaptureDeviceInput = captureDeviceInput;
}
[self.metadataOutput setMetadataObjectTypes:self.metadataOutput.availableMetadataObjectTypes];
}
[self.session commitConfiguration];
});
}
- (void)captureStill:(NSInteger)target options:(NSDictionary *)options callback:(RCTResponseSenderBlock)callback {
dispatch_async(self.sessionQueue, ^{
#if TARGET_IPHONE_SIMULATOR
CGSize size = CGSizeMake(720, 1280);
UIGraphicsBeginImageContextWithOptions(size, YES, 0);
[[UIColor whiteColor] setFill];
UIRectFill(CGRectMake(0, 0, size.width, size.height));
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imageData = UIImageJPEGRepresentation(image, 1.0);
[self saveImage:imageData target:target metadata:nil callback:callback];
#else
[[self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo] setVideoOrientation:self.previewLayer.connection.videoOrientation];
[self.stillImageOutput captureStillImageAsynchronouslyFromConnection:[self.stillImageOutput connectionWithMediaType:AVMediaTypeVideo] completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer) {
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
// Create image source
CGImageSourceRef source = CGImageSourceCreateWithData((CFDataRef)imageData, NULL);
//get all the metadata in the image
NSMutableDictionary *imageMetadata = [(NSDictionary *) CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(source, 0, NULL)) mutableCopy];
// create cgimage
CGImageRef CGImage;
CGImage = CGImageSourceCreateImageAtIndex(source, 0, NULL);
// Rotate it
CGImageRef rotatedCGImage;
if ([options objectForKey:@"rotation"]) {
float rotation = [[options objectForKey:@"rotation"] floatValue];
rotatedCGImage = [self newCGImageRotatedByAngle:CGImage angle:rotation];
} else {
// Get metadata orientation
int metadataOrientation = [[imageMetadata objectForKey:(NSString *)kCGImagePropertyOrientation] intValue];
if (metadataOrientation == 6) {
rotatedCGImage = [self newCGImageRotatedByAngle:CGImage angle:270];
} else if (metadataOrientation == 1) {
rotatedCGImage = [self newCGImageRotatedByAngle:CGImage angle:0];
} else if (metadataOrientation == 3) {
rotatedCGImage = [self newCGImageRotatedByAngle:CGImage angle:180];
} else {
rotatedCGImage = [self newCGImageRotatedByAngle:CGImage angle:0];
}
}
CGImageRelease(CGImage);
// Erase metadata orientation
[imageMetadata removeObjectForKey:(NSString *)kCGImagePropertyOrientation];
// Erase stupid TIFF stuff
[imageMetadata removeObjectForKey:(NSString *)kCGImagePropertyTIFFDictionary];
// Add input metadata
[imageMetadata mergeMetadata:[options objectForKey:@"metadata"]];
// Create destination thing
NSMutableData *rotatedImageData = [NSMutableData data];
CGImageDestinationRef destination = CGImageDestinationCreateWithData((CFMutableDataRef)rotatedImageData, CGImageSourceGetType(source), 1, NULL);
CFRelease(source);
// add the image to the destination, reattaching metadata
CGImageDestinationAddImage(destination, rotatedCGImage, (CFDictionaryRef) imageMetadata);
// And write
CGImageDestinationFinalize(destination);
CFRelease(destination);
[self saveImage:rotatedImageData target:target metadata:imageMetadata callback:callback];
CGImageRelease(rotatedCGImage);
}
else {
callback(@[RCTMakeError(error.description, nil, nil)]);
}
}];
#endif
});
}
- (void)saveImage:(NSData*)imageData target:(NSInteger)target metadata:(NSDictionary *)metadata callback:(RCTResponseSenderBlock)callback {
NSString *responseString;
if (target == RCTCameraCaptureTargetMemory) {
responseString = [imageData base64EncodedStringWithOptions:0];
}
else if (target == RCTCameraCaptureTargetDisk) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths firstObject];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *fullPath = [[documentsDirectory stringByAppendingPathComponent:[[NSUUID UUID] UUIDString]] stringByAppendingPathExtension:@"jpg"];
[fileManager createFileAtPath:fullPath contents:imageData attributes:nil];
responseString = fullPath;
}
else if (target == RCTCameraCaptureTargetCameraRoll) {
[[[ALAssetsLibrary alloc] init] writeImageDataToSavedPhotosAlbum:imageData metadata:metadata completionBlock:^(NSURL* url, NSError* error) {
if (error == nil) {
callback(@[[NSNull null], [url absoluteString]]);
}
else {
callback(@[RCTMakeError(error.description, nil, nil)]);
}
}];
return;
}
callback(@[[NSNull null], responseString]);
}
- (CGImageRef)newCGImageRotatedByAngle:(CGImageRef)imgRef angle:(CGFloat)angle
{
CGFloat angleInRadians = angle * (M_PI / 180);
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGRect imgRect = CGRectMake(0, 0, width, height);
CGAffineTransform transform = CGAffineTransformMakeRotation(angleInRadians);
CGRect rotatedRect = CGRectApplyAffineTransform(imgRect, transform);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef bmContext = CGBitmapContextCreate(NULL, rotatedRect.size.width, rotatedRect.size.height, 8, 0, colorSpace, (CGBitmapInfo) kCGImageAlphaPremultipliedFirst);
CGContextSetAllowsAntialiasing(bmContext, TRUE);
CGContextSetInterpolationQuality(bmContext, kCGInterpolationNone);
CGColorSpaceRelease(colorSpace);
CGContextTranslateCTM(bmContext, +(rotatedRect.size.width/2), +(rotatedRect.size.height/2));
CGContextRotateCTM(bmContext, angleInRadians);
CGContextTranslateCTM(bmContext, -(rotatedRect.size.width/2), -(rotatedRect.size.height/2));
CGContextDrawImage(bmContext, CGRectMake((rotatedRect.size.width-width)/2.0f, (rotatedRect.size.height-height)/2.0f, width, height), imgRef);
CGImageRef rotatedImage = CGBitmapContextCreateImage(bmContext);
CFRelease(bmContext);
return rotatedImage;
}
-(void)captureVideo:(NSInteger)target options:(NSDictionary *)options callback:(RCTResponseSenderBlock)callback {
if (self.movieFileOutput.recording) {
callback(@[RCTMakeError(@"Already Recording", nil, nil)]);
return;
}
if ([options valueForKey:@"audio"]) {
[self initializeCaptureSessionInput:AVMediaTypeAudio];
}
Float64 totalSeconds = [[options valueForKey:@"totalSeconds"] floatValue];
if (totalSeconds > -1) {
int32_t preferredTimeScale = [[options valueForKey:@"preferredTimeScale"] intValue];
CMTime maxDuration = CMTimeMakeWithSeconds(totalSeconds, preferredTimeScale);
self.movieFileOutput.maxRecordedDuration = maxDuration;
}
dispatch_async(self.sessionQueue, ^{
[[self.movieFileOutput connectionWithMediaType:AVMediaTypeVideo] setVideoOrientation:self.previewLayer.connection.videoOrientation];
//Create temporary URL to record to
NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output.mov"];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:outputPath]) {
NSError *error;
if ([fileManager removeItemAtPath:outputPath error:&error] == NO) {
callback(@[RCTMakeError(error.description, nil, nil)]);
return;
}
}
//Start recording
[self.movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];
self.videoCallback = callback;
self.videoTarget = target;
});
}
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
fromConnections:(NSArray *)connections
error:(NSError *)error
{
BOOL recordSuccess = YES;
if ([error code] != noErr) {
// A problem occurred: Find out if the recording was successful.
id value = [[error userInfo] objectForKey:AVErrorRecordingSuccessfullyFinishedKey];
if (value) {
recordSuccess = [value boolValue];
}
}
if (!recordSuccess) {
self.videoCallback(@[RCTMakeError(@"Error while recording", nil, nil)]);
return;
}
if (self.videoTarget == RCTCameraCaptureTargetCameraRoll) {
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputFileURL]) {
[library writeVideoAtPathToSavedPhotosAlbum:outputFileURL
completionBlock:^(NSURL *assetURL, NSError *error) {
if (error) {
self.videoCallback(@[RCTMakeError(error.description, nil, nil)]);
return;
}
self.videoCallback(@[[NSNull null], [assetURL absoluteString]]);
}];
}
}
else if (self.videoTarget == RCTCameraCaptureTargetDisk) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths firstObject];
NSString *fullPath = [[documentsDirectory stringByAppendingPathComponent:[[NSUUID UUID] UUIDString]] stringByAppendingPathExtension:@"mov"];
NSFileManager * fileManager = [NSFileManager defaultManager];
NSError * error = nil;
//copying destination
if (!([fileManager copyItemAtPath:[outputFileURL path] toPath:fullPath error:&error])) {
self.videoCallback(@[RCTMakeError(error.description, nil, nil)]);
return;
}
self.videoCallback(@[[NSNull null], fullPath]);
}
else {
self.videoCallback(@[RCTMakeError(@"Target not supported", nil, nil)]);
}
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
for (AVMetadataMachineReadableCodeObject *metadata in metadataObjects) {
for (id barcodeType in [self getBarCodeTypes]) {
if (metadata.type == barcodeType) {
[self.bridge.eventDispatcher sendDeviceEventWithName:@"CameraBarCodeRead"
body:@{
@"type": metadata.type,
@"data": metadata.stringValue,
@"bounds": @{
@"origin": @{
@"x": [NSString stringWithFormat:@"%f", metadata.bounds.origin.x],
@"y": [NSString stringWithFormat:@"%f", metadata.bounds.origin.y]
},
@"size": @{
@"height": [NSString stringWithFormat:@"%f", metadata.bounds.size.height],
@"width": [NSString stringWithFormat:@"%f", metadata.bounds.size.width],
}
}
}];
}
}
}
}
- (AVCaptureDevice *)deviceWithMediaType:(NSString *)mediaType preferringPosition:(AVCaptureDevicePosition)position
{
NSArray *devices = [AVCaptureDevice devicesWithMediaType:mediaType];
AVCaptureDevice *captureDevice = [devices firstObject];
for (AVCaptureDevice *device in devices)
{
if ([device position] == position)
{
captureDevice = device;
break;
}
}
return captureDevice;
}
- (void)setFlashMode:(AVCaptureFlashMode)flashMode forDevice:(AVCaptureDevice *)device
{
if (device.hasFlash && [device isFlashModeSupported:flashMode])
{
NSError *error = nil;
if ([device lockForConfiguration:&error])
{
[device setFlashMode:flashMode];
[device unlockForConfiguration];
}
else
{
NSLog(@"%@", error);
}
}
}
- (void)subjectAreaDidChange:(NSNotification *)notification
{
CGPoint devicePoint = CGPointMake(.5, .5);
[self focusWithMode:AVCaptureFocusModeContinuousAutoFocus exposeWithMode:AVCaptureExposureModeContinuousAutoExposure atDevicePoint:devicePoint monitorSubjectAreaChange:NO];
}
- (void)focusWithMode:(AVCaptureFocusMode)focusMode exposeWithMode:(AVCaptureExposureMode)exposureMode atDevicePoint:(CGPoint)point monitorSubjectAreaChange:(BOOL)monitorSubjectAreaChange
{
dispatch_async([self sessionQueue], ^{
AVCaptureDevice *device = [[self videoCaptureDeviceInput] device];
NSError *error = nil;
if ([device lockForConfiguration:&error])
{
if ([device isFocusPointOfInterestSupported] && [device isFocusModeSupported:focusMode])
{
[device setFocusMode:focusMode];
[device setFocusPointOfInterest:point];
}
if ([device isExposurePointOfInterestSupported] && [device isExposureModeSupported:exposureMode])
{
[device setExposureMode:exposureMode];
[device setExposurePointOfInterest:point];
}
[device setSubjectAreaChangeMonitoringEnabled:monitorSubjectAreaChange];
[device unlockForConfiguration];
}
else
{
NSLog(@"%@", error);
}
});
}
- (void) focusAtThePoint:(CGPoint) atPoint;
{
Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
if (captureDeviceClass != nil) {
dispatch_async([self sessionQueue], ^{
AVCaptureDevice *device = [[self videoCaptureDeviceInput] device];
if([device isFocusPointOfInterestSupported] &&
[device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
CGRect screenRect = [[UIScreen mainScreen] bounds];
double screenWidth = screenRect.size.width;
double screenHeight = screenRect.size.height;
double focus_x = atPoint.x/screenWidth;
double focus_y = atPoint.y/screenHeight;
if([device lockForConfiguration:nil]) {
[device setFocusPointOfInterest:CGPointMake(focus_x,focus_y)];
[device setFocusMode:AVCaptureFocusModeAutoFocus];
if ([device isExposureModeSupported:AVCaptureExposureModeAutoExpose]){
[device setExposureMode:AVCaptureExposureModeAutoExpose];
}
[device unlockForConfiguration];
}
}
});
}
}
- (void) zoom:(CGFloat)velocity reactTag:(NSNumber *)reactTag{
const CGFloat pinchVelocityDividerFactor = 20.0f; // TODO: calibrate or make this component's property
NSError *error = nil;
AVCaptureDevice *device = [[self videoCaptureDeviceInput] device];
if ([device lockForConfiguration:&error]) {
CGFloat zoomFactor = device.videoZoomFactor + atan(velocity / pinchVelocityDividerFactor);
NSDictionary *event = @{
@"target": reactTag,
@"zoomFactor": [NSNumber numberWithDouble:zoomFactor],
@"velocity": [NSNumber numberWithDouble:velocity]
};
[self.bridge.eventDispatcher sendInputEventWithName:@"zoomChanged" body:event];
device.videoZoomFactor = zoomFactor >= 1.0f ? zoomFactor : 1.0f;
[device unlockForConfiguration];
} else {
NSLog(@"error: %@", error);
}
}
@end
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