在YUV中绘制CGImageRef [英] Drawing CGImageRef in YUV

问题描述

我在这里使用代码在OS X上将CGImageRef转换为CVPixelBufferRef.

I am using the code here to convert a CGImageRef into a CVPixelBufferRef on OS X .

将UIImage转换为CVImageBufferRef

但是，我需要在YUV (kCVPixelFormatType_420YpCbCr8Planar)中而不是现在的RBG中绘制图像.

However, I need the image to be drawn in YUV (kCVPixelFormatType_420YpCbCr8Planar) instead of RBG as it is now.

无论如何，是否可以在YUV色彩空间中直接绘制CGImage?如果不是，是否有人能提供将CVPixedBufferRef从 RBG 转换为 YUV 的最佳方法的例子?

Is there anyway to directly draw a CGImage in YUV colorspace? And if not, does anyone have an example for the best way to go about converting the CVPixedBufferRef from RBG into YUV?

我了解转换的公式，但是在CPU上进行转换的速度非常慢.

I understand the formulas for the conversion but doing it on the CPU is painfully slow.

推荐答案

使用以下方法找出答案:

Figured it out using:

CVPixelBufferRef converted_frame;

CVPixelBufferCreate(kCFAllocatorDefault, width, height, kCVPixelFormatType_420YpCbCr8Planar, 0, &converted_frame);

VTPixelTransferSessionTransferImage(_vtpt_ref, imageBuffer, converted_frame);

其中imageBuffer是来源CVPixedBufferRef

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