我将如何完成这两项任务的部分拼凑在一起,我只是不知道如何将它们放在一起。第一个代码块捕获一个图像,但它只是一个图像缓冲区,不能转换为 UIImage。
- (void) captureStillImage
{
AVCaptureConnection *stillImageConnection = [[self stillImageOutput] connectionWithMediaType:AVMediaTypeVideo];
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:stillImageConnection
completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
if (imageDataSampleBuffer != NULL) {
NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
UIImage *captureImage = [[UIImage alloc] initWithData:imageData];
}
if ([[self delegate] respondsToSelector:@selector(captureManagerStillImageCaptured:)]) {
[[self delegate] captureManagerStillImageCaptured:self];
}
}];
}
这是一个苹果的例子,它使用一个图像缓冲区并将其转换为 UIImage。我如何结合这两种方法一起工作?
-(UIImage*) getUIImageFromBuffer:(CMSampleBufferRef) imageSampleBuffer{
// Get a CMSampleBuffer's Core Video image buffer for the media data
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(imageSampleBuffer);
if (imageBuffer==NULL) {
NSLog(@"No buffer");
}
// Lock the base address of the pixel buffer
if((CVPixelBufferLockBaseAddress(imageBuffer, 0))==kCVReturnSuccess){
NSLog(@"Buffer locked successfully");
}
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
// Get the number of bytes per row for the pixel buffer
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
NSLog(@"bytes per row %zu",bytesPerRow );
// Get the pixel buffer width and height
size_t width = CVPixelBufferGetWidth(imageBuffer);
NSLog(@"width %zu",width);
size_t height = CVPixelBufferGetHeight(imageBuffer);
NSLog(@"height %zu",height);
// Create a device-dependent RGB color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// Create a bitmap graphics context with the sample buffer data
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,
bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
// Create a Quartz image from the pixel data in the bitmap graphics context
CGImageRef quartzImage = CGBitmapContextCreateImage(context);
// Free up the context and color space
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
// Create an image object from the Quartz image
UIImage *image= [UIImage imageWithCGImage:quartzImage];
// Release the Quartz image
CGImageRelease(quartzImage);
// Unlock the pixel buffer
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
return (image );
}