如何将 C.AVFrame* 转换为图像。图像？

Question

我有 C.AVFrame* 原始图像。从C.AVFrame*转换为jpg后，我正在处理jpg解码后的Go图像。有没有办法直接从C.AVFrame*创建Go图像？

Answer 1

这是一个很好的起点：https://github.com/nareix/joy4/blob/05a4ffbb53695aaacf9a2e2624472686280ab6dc/cgo/ffmpeg/video.go#L64-L88

一旦你拥有了你所能做到的：*C.AVFrameframe

func fromCPtr(buf unsafe.Pointer, size int) (ret []uint8) {

    hdr := (*reflect.SliceHeader)((unsafe.Pointer(&ret)))

    hdr.Cap = size

    hdr.Len = size

    hdr.Data = uintptr(buf)

    return

}

w := int(frame.width)

h := int(frame.height)

ys := int(frame.linesize[0])

cs := int(frame.linesize[1])

img = image.YCbCr{

    Y: fromCPtr(unsafe.Pointer(frame.data[0]), ys*h),

    Cb: fromCPtr(unsafe.Pointer(frame.data[1]), cs*h/2),

    Cr: fromCPtr(unsafe.Pointer(frame.data[2]), cs*h/2),

    YStride: ys,

    CStride: cs,

    SubsampleRatio: image.YCbCrSubsampleRatio420,

    Rect: image.Rect(0, 0, w, h),

}

在 哪个实现中填充映像image.YCbCrimage.Image