NV12转化为BMP函数

void SaveBMP ( BYTE* data, int w, int h ) // data指代的是解码后的原始数据，格式为：NV12

{

FILE *f;

unsigned char *img = NULL;

int filesize = 54 + 3*w*h; //w is your image width, h is image height, both int

if( img ) { free( img ); }

img = (unsigned char *)malloc(3*w*h);

memset(img,0,sizeof(img));

for(int j=0; j<h; j++)

{

for(int i=0; i<w; i++)

{

unsigned char r,g,b;

r = data[(((j*w)+i)*4)+2];

g = data[(((j*w)+i)*4)+1];

b = data[(((j*w)+i)*4)+0];

img[(((j*w)+i)*3)+2] = (r);

img[(((j*w)+i)*3)+1] = (g);

img[(((j*w)+i)*3)+0] = (b);

}

}

unsigned char bmpfileheader[14] = {'B','M', 0,0,0,0, 0,0, 0,0, 54,0,0,0};

unsigned char bmpinfoheader[40] = {40,0,0,0, 0,0,0,0, 0,0,0,0, 1,0, 24,0};

unsigned char bmppad[3] = {0,0,0};

bmpfileheader[ 2] = (unsigned char)(filesize );

bmpfileheader[ 3] = (unsigned char)(filesize>> 8);

bmpfileheader[ 4] = (unsigned char)(filesize>>16);

bmpfileheader[ 5] = (unsigned char)(filesize>>24);

bmpinfoheader[ 4] = (unsigned char)( w );

bmpinfoheader[ 5] = (unsigned char)( w>> 8);

bmpinfoheader[ 6] = (unsigned char)( w>>16);

bmpinfoheader[ 7] = (unsigned char)( w>>24);

bmpinfoheader[ 8] = (unsigned char)( h );

bmpinfoheader[ 9] = (unsigned char)( h>> 8);

bmpinfoheader[10] = (unsigned char)( h>>16);

bmpinfoheader[11] = (unsigned char)( h>>24);

g_FrameCapFile[] = "framecap.bmp"; //保存的图片名称

f = fopen(g_FrameCapFile,"wb");

fwrite(bmpfileheader,1,14,f);

fwrite(bmpinfoheader,1,40,f);

for(int i=0; i<h; i++)

{

fwrite(img+(w*(h-i-1)*3),3,w,f);

fwrite(bmppad,1,(4-(w*3)%4)%4,f);

}

fclose(f);

printf("saved frame capture file width = %d, height = %d\n", w, h);

}