Show Camera streaming from frames by using UIImageView memory leak crash - ios

Question

I am using QCAR library, and I get the camera Frame from the library in each frame.
I am trying to show this frame by using setImage on my UIImageView* mCurFrameView. This works at first, and I am able to see the frames run smooth, but after 20 seconds it crashes.
Sometimes I get EXC_BAD_ACCESS on
int retVal = UIApplicationMain(argc, argv, nil, nil);
Sometimes it's just gdb and paused.
Sometimes before he crash I get
2012-02-24 15:59:15.726 QRAR_nextGen[226:707] Received memory warning.
Here's my code:
-(void)SaveCurrentFrame:(UIImage*)image
{
mCurFrameView.image = image;
}
- (void)renderFrameQCAR
{
cout<<"I am starting"<<endl;
QCAR::State state = QCAR::Renderer::getInstance().begin();
QCAR::setFrameFormat(QCAR::RGB888, true);
const QCAR::Image *image = state.getFrame().getImage(1);// 0: YUV, 1: Grayscale image
if (image)
{
const char *data = (const char *)image->getPixels();
int width = image->getWidth(); int height = image->getHeight();
colorSpace = CGColorSpaceCreateDeviceRGB();
bitmapInfo = kCGBitmapByteOrderDefault;
provider = CGDataProviderCreateWithData(NULL, data, width*height*3, NULL);
intent = kCGRenderingIntentDefault;
imageRef = CGImageCreate(width, height, 8, 8*3, width * 3, colorSpace, bitmapInfo, provider, NULL, NO, intent);
mCurFrame = [UIImage imageWithCGImage:imageRef];
cout<<"I am waiting"<<endl;
[self performSelectorOnMainThread:#selector(SaveCurrentFrame:) withObject:mCurFrame waitUntilDone:YES];
}
I've tried several things: showing CALayer to show the camera, release, retain, autorelease, defining and not defining property and synthesizing.
I'd appreciate it a lot if some one could help me. I am losing my mind. Thanks A lot.

Answer 1

You are not releasing (leaking) each CGDataProvider, that means you are storing all the images data on memory. Try doing CGDataProviderRelease(provider) after performSelectorOnMainThread.

Answer 2

Maybe you are missing this:
QCAR::Renderer::getInstance().end();
Here's a snippet working on iPhone 4S/5 iOS 6
- (void)renderFrameIntoImage {
QCAR::State state = QCAR::Renderer::getInstance().begin();
QCAR::setFrameFormat(QCAR::GRAYSCALE, true);
const QCAR::Image *image = state.getFrame().getImage(0); // 0: YUV, 1: Grayscale image
const char *data = (const char *)image->getPixels();
int width = image->getWidth(); int height = image->getHeight();
CGColorSpace *colorSpace = CGColorSpaceCreateDeviceGray();
CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
CGDataProvider *provider = CGDataProviderCreateWithData(NULL, data, width*height, NULL);
CGColorRenderingIntent intent = kCGRenderingIntentDefault;
CGImageRef imageRef = CGImageCreate(width, height, 8, 8, width * 1, colorSpace, bitmapInfo, provider, NULL, NO, intent);
UIImage *myImage = [UIImage imageWithCGImage:imageRef];
QCAR::Renderer::getInstance().end();
UIImageWriteToSavedPhotosAlbum(myImage, nil, nil, NULL);
}
Regards...

Answer 3

You have three leaks.
You must call a Release method for every CoreFoundation method with the word Create in it.
CGColorSpaceRelease(colorSpace);
CGDataProviderRelease(provider);
CGImageRelease(imageRef);
A C++ method to do the QCAR::Image to UIImage conversion
inline UIImage *imageWithQCARCameraImage(const QCAR::Image *cameraImage)
{
UIImage *image = nil;
if (cameraImage) {
CGColorSpaceRef colorSpace = NULL;
QCAR::PIXEL_FORMAT pixelFormat = cameraImage->getFormat();
int bitsPerPixel = QCAR::getBitsPerPixel(pixelFormat);
switch (pixelFormat) {
case QCAR::RGB888:
colorSpace = CGColorSpaceCreateDeviceRGB();
break;
case QCAR::GRAYSCALE:
colorSpace = CGColorSpaceCreateDeviceGray();
break;
case QCAR::YUV:
case QCAR::RGB565:
case QCAR::RGBA8888:
case QCAR::INDEXED:
std::cerr << "Image format conversion not implemented." << std::endl;
break;
case QCAR::UNKNOWN_FORMAT:
std::cerr << "Image format unknown." << std::endl;
break;
}
float width = cameraImage->getWidth();
float height = cameraImage->getHeight();
int bytesPerRow = cameraImage->getStride();
const void *baseAddress = cameraImage->getPixels();
size_t totalBytes = QCAR::getBufferSize(width, height, pixelFormat);
if (bitsPerPixel > 0 && colorSpace != NULL) {
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL,
baseAddress,
totalBytes,
NULL);
int bitsPerComponent = 8;
CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault | kCGImageAlphaNone;
CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;
CGImageRef imageRef = CGImageCreate(width,
height,
bitsPerComponent,
bitsPerPixel,
bytesPerRow,
colorSpace,
bitmapInfo,
provider,
NULL,
NO,
renderingIntent);
image = [UIImage imageWithCGImage:imageRef];
CGColorSpaceRelease(colorSpace);
CGDataProviderRelease(provider);
CGImageRelease(imageRef);
}
}
return image;
}