问题 将UIImage转换为CVPixelBufferRef

您可以使用Core Image从UIImage创建CVPixelBuffer。

// 1. Create a CIImage with the underlying CGImage encapsulated by the UIImage (referred to as 'image'):

CIImage *inputImage = [CIImage imageWithCGImage:image.CGImage];

// 2. Create a CIContext:

Context *ciContext = [CIContext contextWithCGContext:UIGraphicsGetCurrentContext() options:nil];

// 3. Render the CIImage to a CVPixelBuffer (referred to as 'outputBuffer'):

[self.ciContext render:img toCVPixelBuffer:outputBuffer];

AVFoundation提供了读取视频文件（称为资源）的类，以及从处理（或已经读取）资产到像素缓冲区的其他AVFoundation对象的输出。如果这是您唯一关注的问题，您可以在样本照片编辑扩展示例代码中找到您要查找的内容。

如果您的源是从一系列UIImage对象生成的（可能没有源文件，并且您是从用户生成的内容创建新文件），那么上面提供的示例代码就足够了。

注意：它不是最有效的手段，也不是将UIImage转换为CVPixelBuffer的唯一方法;但是，这是最简单的手段。使用Core Graphics将UIImage转换为CVPixelBuffer需要更多代码来设置属性，例如像素缓冲区大小和颜色空间，Core Image会为您处理这些属性。

谷歌永远是你的朋友。搜索“CVPixelBufferRef”第一个结果导致 这个片段 从 snipplr：

- (CVPixelBufferRef)fastImageFromNSImage:(NSImage *)image{
CVPixelBufferRef buffer = NULL;

// config
size_t width = [image size].width;
size_t height = [image size].height;
size_t bitsPerComponent = 8; // *not* CGImageGetBitsPerComponent(image);
CGColorSpaceRef cs = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
CGBitmapInfo bi = kCGImageAlphaNoneSkipFirst; // *not* CGImageGetBitmapInfo(image);
NSDictionary *d = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey, [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, nil];

// create pixel buffer
CVPixelBufferCreate(kCFAllocatorDefault, width, height, k32ARGBPixelFormat, (CFDictionaryRef)d, &buffer);
CVPixelBufferLockBaseAddress(buffer, 0);
void *rasterData = CVPixelBufferGetBaseAddress(buffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(buffer);

// context to draw in, set to pixel buffer's address
CGContextRef ctxt = CGBitmapContextCreate(rasterData, width, height, bitsPerComponent, bytesPerRow, cs, bi);
if(ctxt == NULL){
    NSLog(@"could not create context");
    return NULL;
}

// draw
NSGraphicsContext *nsctxt = [NSGraphicsContext graphicsContextWithGraphicsPort:ctxt flipped:NO];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:nsctxt];
[image compositeToPoint:NSMakePoint(0.0, 0.0) operation:NSCompositeCopy];
[NSGraphicsContext restoreGraphicsState];

CVPixelBufferUnlockBaseAddress(buffer, 0);
CFRelease(ctxt);

return buffer;
}

不过，不知道这是否有效。 （你的里程可能会谨慎:)

CVPixelBufferRef是核心视频用于摄像机输入的内容。

您可以使用CGBitmapContextCreate从图像创建类似的像素位图，然后将图像绘制到位图上下文中。

虽然很晚但是对于需要的人。

 // call like this
    CVPixelBufferRef videobuffer = [self pixelBufferFromCGImage:yourImage.CGImage]; 

//转换的方法

-(CVPixelBufferRef)pixelBufferFromCGImage:(CGImageRef)image{

    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, nil];
    CVPixelBufferRef pxbuffer = NULL;
    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, videoSize.width, videoSize.height,
                                          kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef)options, &pxbuffer);
    NSParameterAssert(status == kCVReturnSuccess && pxbuffer != NULL);

    CVPixelBufferLockBaseAddress(pxbuffer, 0);
    void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
    NSParameterAssert(pxdata != NULL);

    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(pxdata, videoSize.width, videoSize.height, 8, 4*videoSize.width, rgbColorSpace, kCGImageAlphaNoneSkipFirst);
    NSParameterAssert(context);
    CGContextConcatCTM(context, CGAffineTransformIdentity);
    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image);
    CGColorSpaceRelease(rgbColorSpace);
    CGContextRelease(context);
    CVPixelBufferUnlockBaseAddress(pxbuffer, 0);

    return pxbuffer;
}