仅在iPhone 3G上返回空白图像

Question

我正在使用Apple的示例代码进行Avcapturesession，而创建的UIIMAGE完全是空白的。这仅在iPhone 3G上发生，以及在控制台上显示的独特错误 -

错误：CGDATAPROVIDERCREATEWITHCOPYOFDATA：VM_COPY失败：状态2。

我已经在网上研究了这个错误，发现了这个错误 stackoverflow答案, ，它摆脱了错误...但是图像仍然空白。

有没有其他人经历过这种情况并知道如何解决？

提前致谢。

我的代码 -

CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); 
CVPixelBufferLockBaseAddress(imageBuffer, 0); 

void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer); 
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); 
size_t width = CVPixelBufferGetWidth(imageBuffer); 
size_t height = CVPixelBufferGetHeight(imageBuffer); 

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 

CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); 
CGImageRef quartzImage = CGBitmapContextCreateImage(context); 
CVPixelBufferUnlockBaseAddress(imageBuffer,0);

CGContextRelease(context); 
CGColorSpaceRelease(colorSpace);

UIImage *image = [UIImage imageWithCGImage:quartzImage];

CGImageRelease(quartzImage);

return image;

Answer 1

API中的一些时髦的东西，因此我正在使用的工作是：

//void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);     
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);     
size_t width = CVPixelBufferGetWidth(imageBuffer);     
size_t height = CVPixelBufferGetHeight(imageBuffer);     

// vm_copy fails on older model phones...    
//    
uint8_t *baseAddress = malloc( bytesPerRow * height );    
memcpy( baseAddress, CVPixelBufferGetBaseAddress(imageBuffer), bytesPerRow * height );

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();     

// NO ALPHA CHANNEL ON OLDER MODELS    
// CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);     
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst);     
CGImageRef quartzImage = CGBitmapContextCreateImage(context);     

CVPixelBufferUnlockBaseAddress(imageBuffer,0);    
CGContextRelease(context);     
CGColorSpaceRelease(colorSpace);    
free( baseAddress );

UIImage *image = [UIImage imageWithCGImage:quartzImage];    
CGImageRelease(quartzImage);

return image;