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IOS编码有些新颖;尽管对编程并不陌生;试图了解如何实现Jonathan Wight在几年前如何实施AVFoundation这个有趣的例子。AVFoundation示例方法实现？
所以我复制并粘贴到它自己的NSObject ccamera.h & ccamera.m类文件;然后将其声明为sharedInstance。我可以打电话给startRunning方法......但还有一点点失去了对下一步...
ccamera *newcamera = [ccamera sharedInstance];
[newcamera startRunning];
任何人可以帮助/明白我需要说下做的，拍摄静止与此代码框架？
感谢
//
// CCamera.h
// CCamera
//
// Created by Jonathan Wight on 7/12/12.
// Copyright (c) 2012 Jonathan Wight. All rights reserved.
//
#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
@interface CCamera : NSObject
@property (readwrite, nonatomic, assign) AVCaptureDevicePosition captureDevicePosition;
@property (readwrite, nonatomic, strong) NSString *preset;
@property (readonly, nonatomic, strong) AVCaptureDevice *captureDevice;
@property (readonly, nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;
+ (CCamera *)sharedInstance;
- (void)startRunning;
- (void)stopRunning;
- (CGSize)size;
- (void)captureStillCMSampleBuffer:(void (^)(CMSampleBufferRef sampleBuffer, NSError *error))inCompletionBlock;
- (void)captureStillCVImageBuffer:(void (^)(CVImageBufferRef imageBuffer, NSError *error))inCompletionBlock;
- (void)captureStillCIImage:(void (^)(CIImage *image, NSError *error))inCompletionBlock;
- (void)captureStillCGImage:(void (^)(CGImageRef image, NSError *error))inCompletionBlock;
- (void)captureStillUIImage:(void (^)(UIImage *image, NSError *error))inCompletionBlock;
@end
//
// CCamera.m
// Camera
//
// Created by Jonathan Wight on 7/12/12.
// Copyright (c) 2012 Jonathan Wight. All rights reserved.
//
#import "CCamera.h"
#import <AVFoundation/AVFoundation.h>
#import <QuartzCore/QuartzCore.h>
@interface CCamera()
@property (readwrite, nonatomic, strong) AVCaptureSession *captureSession;
@property (readwrite, nonatomic, strong) AVCaptureDevice *captureDevice;
@property (readwrite, nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;
@property (readwrite, nonatomic, strong) AVCaptureStillImageOutput *imageOutput;
@end
#pragma mark -
@implementation CCamera
static CCamera *gSharedInstance = NULL;
+ (CCamera *)sharedInstance
{
static dispatch_once_t sOnceToken = 0;
dispatch_once(&sOnceToken, ^{
gSharedInstance = [[CCamera alloc] init];
});
return(gSharedInstance);
}
- (id)init
{
if ((self = [super init]) != NULL)
{
_captureDevicePosition = AVCaptureDevicePositionUnspecified;
_preset = AVCaptureSessionPresetPhoto;
}
return(self);
}
- (void)dealloc
{
[_captureSession stopRunning];
}
- (AVCaptureDevice *)captureDevice
{
if (_captureDevice == NULL)
{
if (self.captureDevicePosition == AVCaptureDevicePositionUnspecified)
{
_captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
}
else
{
for (AVCaptureDevice *theDevice in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo])
{
if (theDevice.position == self.captureDevicePosition)
{
_captureDevice = theDevice;
break;
}
}
}
}
return(_captureDevice);
}
- (AVCaptureVideoPreviewLayer *)previewLayer
{
if (_previewLayer == NULL)
{
_previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
}
return(_previewLayer);
}
- (void)startRunning
{
NSError *theError = NULL;
self.captureSession = [[AVCaptureSession alloc] init];
self.captureSession.sessionPreset = self.preset;
AVCaptureDeviceInput *theCaptureDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:self.captureDevice error:&theError];
[self.captureSession addInput:theCaptureDeviceInput];
self.imageOutput = [[AVCaptureStillImageOutput alloc] init];
self.imageOutput.outputSettings = @{
(__bridge NSString *)kCVPixelBufferPixelFormatTypeKey : @(kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange)
};
[self.captureSession addOutput:self.imageOutput];
[self.captureSession startRunning];
}
- (void)stopRunning
{
[self.captureSession stopRunning];
self.captureDevice = NULL;
self.captureSession = NULL;
self.imageOutput = NULL;
self.previewLayer = NULL;
}
- (CGSize)size
{
AVCaptureConnection *theConnection = [self.imageOutput.connections objectAtIndex:0];
__block BOOL theFinishedFlag = NO;
__block CGSize theSize;
[self.imageOutput captureStillImageAsynchronouslyFromConnection:theConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
CVImageBufferRef theImageBuffer = CMSampleBufferGetImageBuffer(imageDataSampleBuffer);
theSize = CVImageBufferGetEncodedSize(theImageBuffer);
theFinishedFlag = YES;
}];
while (theFinishedFlag == NO)
{
[[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.1]];
}
return(theSize);
}
#pragma mark -
- (void)captureStillCMSampleBuffer:(void (^)(CMSampleBufferRef sampleBuffer, NSError *error))inCompletionBlock
{
NSParameterAssert(inCompletionBlock != NULL);
AVCaptureConnection *theConnection = [self.imageOutput.connections objectAtIndex:0];
[self.imageOutput captureStillImageAsynchronouslyFromConnection:theConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
inCompletionBlock(imageDataSampleBuffer, error);
}];
}
- (void)captureStillCVImageBuffer:(void (^)(CVImageBufferRef imageBuffer, NSError *error))inCompletionBlock
{
NSParameterAssert(inCompletionBlock != NULL);
[self captureStillCMSampleBuffer:^(CMSampleBufferRef sampleBuffer, NSError *error) {
CVImageBufferRef theImageBuffer = NULL;
if (sampleBuffer != NULL)
{
theImageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
}
inCompletionBlock(theImageBuffer, error);
}];
}
- (void)captureStillCIImage:(void (^)(CIImage *image, NSError *error))inCompletionBlock
{
NSParameterAssert(inCompletionBlock != NULL);
[self captureStillCVImageBuffer:^(CVImageBufferRef imageBuffer, NSError *error) {
CIImage *theImage = NULL;
if (imageBuffer != NULL)
{
theImage = [CIImage imageWithCVPixelBuffer:imageBuffer];
}
inCompletionBlock(theImage, error);
}];
}
- (void)captureStillCGImage:(void (^)(CGImageRef image, NSError *error))inCompletionBlock
{
NSParameterAssert(inCompletionBlock != NULL);
[self captureStillCIImage:^(CIImage *image, NSError *error) {
CGImageRef theCGImage = NULL;
if (image != NULL)
{
NSDictionary *theOptions = @{
// TODO
};
CIContext *theCIContext = [CIContext contextWithOptions:theOptions];
theCGImage = [theCIContext createCGImage:image fromRect:image.extent];
}
inCompletionBlock(theCGImage, error);
CGImageRelease(theCGImage);
}];
}
- (void)captureStillUIImage:(void (^)(UIImage *image, NSError *error))inCompletionBlock
{
NSParameterAssert(inCompletionBlock != NULL);
[self captureStillCIImage:^(CIImage *image, NSError *error) {
UIImage *theUIImage = NULL;
if (image != NULL)
{
theUIImage = [UIImage imageWithCIImage:image];
}
inCompletionBlock(theUIImage, error);
}];
}
@end