我在控制台中看到以下错误信息:
: CGBitmapContextCreate: 数据字节/行无效:每个整数位元组件至少应为1920,3个组件,kCGImageAlphaPremultipliedFirst。 : CGBitmapContextCreateImage: 无效的上下文0x0。
我使用以下代码:
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{
// Get a CMSampleBuffer's Core Video image buffer for the media data
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
// Lock the base address of the pixel buffer
CVPixelBufferLockBaseAddress(imageBuffer, 0);
// Get the number of bytes per row for the pixel buffer
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);
}
bytesPerRow
、width
和height
,将得到什么结果? - WildakerCGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
之前添加NSLog(@"%zi, %zi, %zi",width,height,bytesPerRow);
,控制台会输出什么? - WildakersampleBuffer
肯定有问题。一个有效的BGRACMSampleBufferRef
每行字节数至少是所表示图像宽度的四倍。你的问题几乎肯定不在这段代码上(反正这只是从苹果复制粘贴过来的),而是在调用它的代码上,看起来是这样的。 - Wildaker