yuyv420转yuyv422

void cvt_420_422(int width, int height, char *src, char *dst)

{

unsigned char *py = (unsigned char *)src;

unsigned char *pu = (unsigned char *)src + width * height;

unsigned char *pv = (unsigned char *)src + width * height * 5 / 4;

unsigned char *pPixels = (unsigned char *)dst;

uint64_t looprow = width / 8;

uint64_t loopcol = height / 2;

uint64_t step1 = width;

uint64_t step2 = width * 2;

__asm__

{

mov rdi, pPixels;

mov rsi, py;

mov r8, step1;

add r8, rsi;

mov r9, pu;

mov r10, pv;

mov r11, step2;

add r11, rdi;

mov rbx, loopcol;

COL:

mov rcx, looprow;

ROW:

movq xmm0, [rsi];

movq xmm1, [r8];

movd xmm3, [r9];

movd xmm4, [r10];

add rsi, 8;

add r8, 8;

add r9, 4;

add r10, 4;

pxor xmm5, xmm5;

punpcklbw xmm3, xmm5;

punpcklbw xmm5, xmm4;

pxor xmm4, xmm4;

punpcklbw xmm4, xmm5;

punpcklbw xmm0, xmm3;

punpcklbw xmm1, xmm3;

por xmm0, xmm4;

por xmm1, xmm4;

movdqu [rdi], xmm0;

movdqu [r11], xmm1;

add rdi, 16;

add r11, 16;

dec rcx;

jnz ROW;

add rdi, step2;

add r11, step2;

add rsi, step1;

add r8, step1;

dec rbx;

jnz COL;

emms;

}

}