NV12转化为RGB

/*
    NV12ToARGB color space conversion CUDA kernel


    This sample uses CUDA to perform a simple NV12 (YUV 4:2:0 planar)
    source and converts to output in ARGB format
*/




#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cudaProcessFrame.h"


__constant__ uint32 constAlpha;


#define MUL(x,y)    (x*y)
__constant__ float  constHueColorSpaceMat[9];




__device__ void YUV2RGB(uint32 *yuvi, float *red, float *green, float *blue)
{
    float luma, chromaCb, chromaCr;


    // Prepare for hue adjustment
    luma     = (float)yuvi[0];
    chromaCb = (float)((int32)yuvi[1] - 512.0f);
    chromaCr = (float)((int32)yuvi[2] - 512.0f);


    // Convert YUV To RGB with hue adjustment
    *red  = MUL(luma,     constHueColorSpaceMat[0]) +
            MUL(chromaCb, constHueColorSpaceMat[1]) +
            MUL(chromaCr, constHueColorSpaceMat[2]);
    *green= MUL(luma,     constHueColorSpaceMat[3]) +
            MUL(chromaCb, constHueColorSpaceMat[4]) +
            MUL(chromaCr, constHueColorSpaceMat[5]);
    *blue = MUL(luma,     constHueColorSpaceMat[6]) +
            MUL(chromaCb, constHueColorSpaceMat[7]) +
            MUL(chromaCr, constHueColorSpaceMat[8]);
}




__device__ uint32 RGBAPACK_8bit(float red, float green, float blue, uint32 alpha)
{
    uint32 ARGBpixel = 0;


    // Clamp final 10 bit results
    red   = min(max(red,   0.0f), 255.0f);
    green = min(max(green, 0.0f), 255.0f);
    blue  = min(max(blue,  0.0f), 255.0f);

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