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Método para encontrar la resolución de la cámara del dispositivo iOS (5)

Cuál es el mejor método para encontrar la resolución de la imagen que se va a capturar usando la configuración AVCaptureSessionPresetPhoto .
Estoy tratando de encontrar la resolución antes de capturar la imagen.

Aquí está la tabla de todas las sesiones de cámara probadas. Preset`s en dispositivos, compatibles con iOS 9

+-----------------------+--------------+---------------------------------+---------------+ | Device | Camera | AVCaptureSessionPreset | Resolution | +-----------------------+--------------+---------------------------------+---------------+ | iPhone 4S | FRONT | | | | | | AVCaptureSessionPresetPhoto | 640x480 | | | | AVCaptureSessionPresetHigh | 640x480 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | not supported | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 3264x2448 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+ | iPhone 5/5C/5S/6/6+ | | | | | | FRONT | | | | | | AVCaptureSessionPresetPhoto | 1280x960 | | | | AVCaptureSessionPresetHigh | 1280x720 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 3264x2448 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+ | iPhone 6S/6S | | | | | | FRONT camera | | | | | | AVCaptureSessionPresetPhoto | 1280x960 | | | | AVCaptureSessionPresetHigh | 1280x720 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK camera | | | | | | AVCaptureSessionPresetPhoto | 4032x3024 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+ | iPad 2 | | | | | | FRONT | | | | | | AVCaptureSessionPresetPhoto | 640x480 | | | | AVCaptureSessionPresetHigh | 640x480 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | not supported | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 960x720 | | | | AVCaptureSessionPresetHigh | 1280x720 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | not supported | +-----------------------+--------------+---------------------------------+---------------+ | iPad 3 | | | | | | FRONT | | | | | | AVCaptureSessionPresetPhoto | 640x480 | | | | AVCaptureSessionPresetHigh | 640x480 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | not supported | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 2592x1936 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+ | iPad 4/Air | | | | | iPad Mini 1/2/3 | | | | | iPod 5G | | | | | | FRONT | | | | | | AVCaptureSessionPresetPhoto | 1280x960 | | | | AVCaptureSessionPresetHigh | 1280x720 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 2592x1936 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+ | iPad Air 2 | | | | | iPad Mini 4 | | | | | iPad Pro | | | | | | FRONT | | | | | | AVCaptureSessionPresetPhoto | 1280x960 | | | | AVCaptureSessionPresetHigh | 1280x720 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 3264x2448 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+ | iPod Touch 5 | | | | | | FRONT | | | | | | AVCaptureSessionPresetPhoto | 1280x960 | | | | AVCaptureSessionPresetHigh | 1280x720 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 2592x1936 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+ | iPod Touch 6 | | | | | | FRONT | | | | | | AVCaptureSessionPresetPhoto | 1280x960 | | | | AVCaptureSessionPresetHigh | 1280x720 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | not supported | | | BACK | | | | | | AVCaptureSessionPresetPhoto | 3264x2448 | | | | AVCaptureSessionPresetHigh | 1920x1080 | | | | AVCaptureSessionPresetMedium | 480x360 | | | | AVCaptureSessionPresetLow | 192x144 | | | | AVCaptureSessionPreset640x480 | 640x480 | | | | AVCaptureSessionPreset1280x720 | 1280x720 | | | | AVCaptureSessionPreset1920x1080 | 1920x1080 | +-----------------------+--------------+---------------------------------+---------------+

CÓDIGO

+ (NSDictionary*) cameraResolutions { NSString* deviceModel = [self deviceModel]; // iPhone 4S if ([deviceModel isEqualToString:@"iPhone4,1"]) { NSString* lFrontCam = @"640x480,480x360,192x144"; NSString* lBackCam = @"3264x2448,1920x1080,1280x720,640x480,480x360,192x144"; NSDictionary* lCamResolutions = @{@"front":lFrontCam, @"back":lBackCam}; return lCamResolutions; } // iPhone 5/5C/5S/6/6+/iPod 6 else if ([deviceModel isEqualToString:@"iPhone5,1"] || [deviceModel isEqualToString:@"iPhone5,2"] || [deviceModel isEqualToString:@"iPhone5,3"] || [deviceModel isEqualToString:@"iPhone5,4"] || [deviceModel isEqualToString:@"iPhone6,1"] || [deviceModel isEqualToString:@"iPhone6,2"] || [deviceModel isEqualToString:@"iPhone7,1"] || [deviceModel isEqualToString:@"iPhone7,2"] || [deviceModel isEqualToString:@"iPod7,1"]) { NSString* lFrontCam = @"1280x960,1280x720,640x480,480x360,192x144"; NSString* lBackCam = @"3264x2448,1920x1080,1280x720,640x480,480x360,192x144"; NSDictionary* lCamResolutions = @{@"front":lFrontCam, @"back":lBackCam}; return lCamResolutions; } // iPhone 6S/6S+ else if ([deviceModel isEqualToString:@"iPhone8,1"] || [deviceModel isEqualToString:@"iPhone8,2"]) { NSString* lFrontCam = @"1280x960,1280x720,640x480,480x360,192x144"; NSString* lBackCam = @"4032x3024,1920x1080,1280x720,640x480,480x360,192x144"; NSDictionary* lCamResolutions = @{@"front":lFrontCam, @"back":lBackCam}; return lCamResolutions; } // iPad 2 else if ([deviceModel isEqualToString:@"iPad2,1"] || [deviceModel isEqualToString:@"iPad2,2"] || [deviceModel isEqualToString:@"iPad2,3"] || [deviceModel isEqualToString:@"iPad2,4"]) { NSString* lFrontCam = @"640x480,480x360,192x144"; NSString* lBackCam = @"1280x720,960x720,480x360,192x144,640x480"; NSDictionary* lCamResolutions = @{@"front":lFrontCam, @"back":lBackCam}; return lCamResolutions; } // iPad 3 else if ([deviceModel isEqualToString:@"iPad3,1"] || [deviceModel isEqualToString:@"iPad3,2"] || [deviceModel isEqualToString:@"iPad3,3"]) { NSString* lFrontCam = @"640x480,480x360,192x144"; NSString* lBackCam = @"2592x1936,1920x1080,1280x720,640x480,480x360,192x144"; NSDictionary* lCamResolutions = @{@"front":lFrontCam, @"back":lBackCam}; return lCamResolutions; } // iPad 4/Air/Mini/Mini 2/Mini 3/iPod 5G else if ([deviceModel isEqualToString:@"iPad3,4"] || [deviceModel isEqualToString:@"iPad3,5"] || [deviceModel isEqualToString:@"iPad3,6"] || [deviceModel isEqualToString:@"iPad4,1"] || [deviceModel isEqualToString:@"iPad4,2"] || [deviceModel isEqualToString:@"iPad4,3"] || [deviceModel isEqualToString:@"iPad4,4"] || [deviceModel isEqualToString:@"iPad4,5"] || [deviceModel isEqualToString:@"iPad4,6"] || [deviceModel isEqualToString:@"iPad4,7"] || [deviceModel isEqualToString:@"iPad4,8"] || [deviceModel isEqualToString:@"iPod5,1"]) { NSString* lFrontCam = @"1280x960,1280x720,640x480,480x360,192x144"; NSString* lBackCam = @"2592x1936,1920x1080,1280x720,640x480,480x360,192x144"; NSDictionary* lCamResolutions = @{@"front":lFrontCam, @"back":lBackCam}; return lCamResolutions; } // iPad Air 2/Mini 4/Pro else if ([deviceModel isEqualToString:@"iPad5,3"] || [deviceModel isEqualToString:@"iPad5,4"]) { NSString* lFrontCam = @"1280x960,1280x720,640x480,480x360,192x144"; NSString* lBackCam = @"3264x2448,1920x1080,1280x720,640x480,480x360,192x144"; NSDictionary* lCamResolutions = @{@"front":lFrontCam, @"back":lBackCam}; return lCamResolutions; } return nil; }

Con la siguiente función, puede obtener la resolución de activeFormat mediante activeFormat antes de que comience la captura, aunque no antes de agregar entradas y salidas: https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVCaptureDevice_Class/index.html#//apple_ref/occ/instp/AVCaptureDevice/activeFormat

private func getCaptureResolution() -> CGSize { // Define default resolution var resolution = CGSize(width: 0, height: 0) // Get cur video device let curVideoDevice = useBackCamera ? backCameraDevice : frontCameraDevice // Set if video portrait orientation let portraitOrientation = orientation == .Portrait || orientation == .PortraitUpsideDown // Get video dimensions if let formatDescription = curVideoDevice?.activeFormat.formatDescription { let dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription) resolution = CGSize(width: CGFloat(dimensions.width), height: CGFloat(dimensions.height)) if portraitOrientation { resolution = CGSize(width: resolution.height, height: resolution.width) } } // Return resolution return resolution }

Probablemente no hay manera de obtener directamente la resolución de la cámara antes de capturar una imagen.

Apple proporciona una tabla para varios dispositivos y presets:

Capturar imágenes fijas

Pruebe este código para obtener la máxima resolución de imagen para cámaras de dispositivos:

- (CMVideoDimensions) getCameraMaxStillImageResolution:(AVCaptureDevicePosition) cameraPosition { CMVideoDimensions max_resolution; max_resolution.width = 0; max_resolution.height = 0; AVCaptureDevice *captureDevice = nil; NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; for (AVCaptureDevice *device in devices) { if ([device position] == cameraPosition) { captureDevice = device; break; } } if (captureDevice == nil) { return max_resolution; } NSArray* availFormats=captureDevice.formats; for (AVCaptureDeviceFormat* format in availFormats) { CMVideoDimensions resolution = format.highResolutionStillImageDimensions; int w = resolution.width; int h = resolution.height; if ((w * h) > (max_resolution.width * max_resolution.height)) { max_resolution.width = w; max_resolution.height = h; } } return max_resolution; } - (void) printCamerasInfo { CMVideoDimensions res; res = [self getCameraMaxStillImageResolution:AVCaptureDevicePositionBack]; NSLog(@" Back Camera max Image resolution: %d x %d", res.width, res.height); res = [self getCameraMaxStillImageResolution:AVCaptureDevicePositionFront]; NSLog(@" Front Camera max Image resolution: %d x %d", res.width, res.height); }

Se puede hacer de esta manera:

/* Callback that is called when you activate the capture session. */ - (void) avCaptureInputPortFormatDescriptionDidChangeNotification:(NSNotification *)notification { CMFormatDescriptionRef formatDescription = nil; NSArray *ports = [deviceInput ports]; AVCaptureInputPort *usePort = nil; for (AVCaptureInputPort *port in ports) { if (usePort == nil || [port.mediaType isEqualToString:AVMediaTypeVideo]) { usePort = port; break; } } if (usePort != nil) formatDescription = usePort.formatDescription; if (formatDescription != nil) { /*------------>>>>>>> THIS IS YOUR RESOLUTION */ CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription); self.frameSize = CGSizeMake(dimensions.width, dimensions.height); [[NSNotificationCenter defaultCenter] removeObserver:self]; NSLog(@"Capturing with %dx%d", (int)self.frameSize.width, (int)self.frameSize.height); } else { NSLog(@"Failed to detect resolution, using default one."); self.frameSize = CGSizeMake(640.0f, 480.0f); } } - (id) init { if ((self = [super init])) { /* Default framesize. */ self.frameSize = CGSizeMake(640.0f, 480.0f); AVCaptureSession *capSession = [[AVCaptureSession alloc] init]; /* -------->>>>>>> REQUESTED RESOLUTION, CAN BE SOMTHING ELSE */ [capSession setSessionPreset:AVCaptureSessionPresetHigh]; // if (([modelName rangeOfString:@"iPhone 5"].length != 0) || ([modelName rangeOfString:@"iPhone 6"].length != 0)) { // [capSession setSessionPreset:AVCaptureSessionPresetHigh]; // } else { // [capSession setSessionPreset:AVCaptureSessionPreset640x480]; // } // self.captureSession = capSession; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(avCaptureInputPortFormatDescriptionDidChangeNotification:) name:AVCaptureInputPortFormatDescriptionDidChangeNotification object:nil]; } return self; } - (void) dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; if (self.captureSession.isRunning) [self.captureSession stopRunning]; self.captureSession = nil; } - (void) addRawViewOutput { /* We setup the output */ AVCaptureVideoDataOutput *captureOutput = [[AVCaptureVideoDataOutput alloc] init]; /* While a frame is processes in -captureOutput:didOutputSampleBuffer:fromConnection: delegate methods no other frames are added in the queue. If you don''t want this behaviour set the property to NO */ captureOutput.alwaysDiscardsLateVideoFrames = YES; /*We specify a minimum duration for each frame (play with this settings to avoid having too many frames waiting in the queue because it can cause memory issues). It is similar to the inverse of the maximum framerate. In this example we set a min frame duration of 1/10 seconds so a maximum framerate of 10fps. We say that we are not able to process more than 10 frames per second.*/ //captureOutput.minFrameDuration = CMTimeMake(1, 10); /*We create a serial queue to handle the processing of our frames*/ dispatch_queue_t queue; queue = dispatch_queue_create("com.YourApp.cameraQueue", NULL); [captureOutput setSampleBufferDelegate:self queue:queue]; // dispatch_release(queue); // Set the video output to store frame in BGRA (It is supposed to be faster) NSString *key = (NSString*)kCVPixelBufferPixelFormatTypeKey; NSNumber *value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA]; NSDictionary *videoSettings = [NSDictionary dictionaryWithObject:value forKey:key]; [captureOutput setVideoSettings:videoSettings]; // Register an output [self.captureSession addOutput:captureOutput]; } - (bool) startWithDevicePosition:(AVCaptureDevicePosition)devicePosition { AVCaptureDevice *videoDevice = [self cameraWithPosition:devicePosition]; if (!videoDevice) return FALSE; NSError *error; AVCaptureDeviceInput *videoIn = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error]; self.deviceInput = videoIn; if (!error) { if ([[self captureSession] canAddInput:videoIn]) { [[self captureSession] addInput:videoIn]; } else { NSLog(@"Couldn''t add video input"); return FALSE; } } else { NSLog(@"Couldn''t create video input"); return FALSE; } [self addRawViewOutput]; [self resume]; return TRUE; } -(void) pause { self.paused = YES; if (self.captureSession.isRunning) [captureSession stopRunning]; } -(void) resume { if (!self.captureSession.isRunning) [captureSession startRunning]; self.paused = NO; } #pragma mark - #pragma mark AVCaptureSession delegate - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); /* Lock the image buffer */ CVPixelBufferLockBaseAddress(imageBuffer,0); /* Get information about the image */ uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer); size_t width = CVPixelBufferGetWidth(imageBuffer); size_t height = CVPixelBufferGetHeight(imageBuffer); size_t stride = CVPixelBufferGetBytesPerRow(imageBuffer); size_t size = CVPixelBufferGetDataSize(imageBuffer); BGRAVideoFrame frame = {(int)width, (int)height, (int)stride, (int)size, baseAddress}; [delegate frameReady:frame]; /* We unlock the image buffer */ CVPixelBufferUnlockBaseAddress(imageBuffer,0); }