The method imageFromSampleBuffer
does work in fact I'm using a changed version of it, but if I remember correctly you need to set the outputSettings right. I think you need to set the key as kCVPixelBufferPixelFormatTypeKey
and the value as kCVPixelFormatType_32BGRA
.
So for example:
NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;
NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
NSDictionary* outputSettings = [NSDictionary dictionaryWithObject:value forKey:key];
[newStillImageOutput setOutputSettings:outputSettings];
EDIT
I am using those settings to take stillImages not video. Is your sessionPreset AVCaptureSessionPresetPhoto? There may be problems with that
AVCaptureSession *newCaptureSession = [[AVCaptureSession alloc] init];
[newCaptureSession setSessionPreset:AVCaptureSessionPresetPhoto];
EDIT 2
The part about saving it to UIImage is identical with the one from the documentation. That's the reason I was asking for other origins of the problem, but I guess that was just grasping for straws. There is another way I know of, but that requires OpenCV.
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer{
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer, 0);
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
// Get the number of bytes per row for the pixel buffer
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
// Get the pixel buffer width and height
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
// 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);
// Unlock the pixel buffer
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
// 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);
return (image);
}
I guess that is of no help to you, sorry. I don't know enough to think of other origins for your problem.