我试图在我自己的代码中复制,而不是使用ffmpeg库,ffmpeg将yuv420p转换为rgb的操作。最初我以为它会在函数内部:swyale.c中的xyz12Torgb48但是做一些跟踪,它看起来是在yuv2rgb.c ff_yuv2rgb_c_init_tables中,我看不到它。
好吧,因为没有人提出解决方案,我只想发布我发现使用valgrind tool = callgrind ffmpeg_g这是一个版本的ffmpeg,调试对象向我展示了被调用的函数,在\ libswscale \ x86里面有yuv2rgb_template。 c,在装配中似乎有你做yuv2rgb的操作
* Conversion is performed in usual way:
* R = Y' * Ycoef + Vred * V'
* G = Y' * Ycoef + Vgreen * V' + Ugreen * U'
* B = Y' * Ycoef + Ublue * U'
*
* where X' = X * 8 - Xoffset (multiplication is performed to increase
* precision a bit).
* Since it operates in YUV420 colorspace, Y component is additionally
* split into Y1 and Y2 for even and odd pixels.
*
* Input:
* mm0 - U (4 elems), mm1 - V (4 elems), mm6 - Y (8 elems), mm4 - zero register
* Output:
* mm1 - R, mm2 - G, mm0 - B
*/ ```