void yuy2toyv12(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst, unsigned num_pixels)
void yuy2toyv12(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst, int width, int height, int lumStride, int chromStride, int srcStride)
void yuy2toyv12(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst, unsigned num_pixels){#ifdef HAVE_MMX	asm volatile(		"xorl %%eax, %%eax		\n\t"		"pcmpeqw %%mm7, %%mm7		\n\t"		"psrlw $8, %%mm7		\n\t" // FF,00,FF,00...		"1:				\n\t"		PREFETCH" 64(%0, %%eax, 4)	\n\t"		"movq (%0, %%eax, 4), %%mm0	\n\t" // YUYV YUYV(0)		"movq 8(%0, %%eax, 4), %%mm1	\n\t" // YUYV YUYV(4)		"movq %%mm0, %%mm2		\n\t" // YUYV YUYV(0)		"movq %%mm1, %%mm3		\n\t" // YUYV YUYV(4)		"psrlw $8, %%mm0		\n\t" // U0V0 U0V0(0)		"psrlw $8, %%mm1		\n\t" // U0V0 U0V0(4)		"pand %%mm7, %%mm2		\n\t" // Y0Y0 Y0Y0(0)		"pand %%mm7, %%mm3		\n\t" // Y0Y0 Y0Y0(4)		"packuswb %%mm1, %%mm0		\n\t" // UVUV UVUV(0)		"packuswb %%mm3, %%mm2		\n\t" // YYYY YYYY(0)		MOVNTQ" %%mm2, (%1, %%eax, 2)	\n\t"		"movq 16(%0, %%eax, 4), %%mm1	\n\t" // YUYV YUYV(8)		"movq 24(%0, %%eax, 4), %%mm2	\n\t" // YUYV YUYV(12)		"movq %%mm1, %%mm3		\n\t" // YUYV YUYV(8)		"movq %%mm2, %%mm4		\n\t" // YUYV YUYV(12)		"psrlw $8, %%mm1		\n\t" // U0V0 U0V0(8)		"psrlw $8, %%mm2		\n\t" // U0V0 U0V0(12)		"pand %%mm7, %%mm3		\n\t" // Y0Y0 Y0Y0(8)		"pand %%mm7, %%mm4		\n\t" // Y0Y0 Y0Y0(12)		"packuswb %%mm2, %%mm1		\n\t" // UVUV UVUV(8)		"packuswb %%mm4, %%mm3		\n\t" // YYYY YYYY(8)		MOVNTQ" %%mm3, 8(%1, %%eax, 2)	\n\t"		"movq %%mm0, %%mm2		\n\t" // UVUV UVUV(0)		"movq %%mm1, %%mm3		\n\t" // UVUV UVUV(8)		"psrlw $8, %%mm0		\n\t" // V0V0 V0V0(0)		"psrlw $8, %%mm1		\n\t" // V0V0 V0V0(8)		"pand %%mm7, %%mm2		\n\t" // U0U0 U0U0(0)		"pand %%mm7, %%mm3		\n\t" // U0U0 U0U0(8)		"packuswb %%mm1, %%mm0		\n\t" // VVVV VVVV(0)		"packuswb %%mm3, %%mm2		\n\t" // UUUU UUUU(0)		MOVNTQ" %%mm0, (%3, %%eax)	\n\t"		MOVNTQ" %%mm2, (%2, %%eax)	\n\t"		"addl $8, %%eax			\n\t"		"cmpl %4, %%eax			\n\t"		" jb 1b				\n\t"		EMMS" \n\t"		SFENCE		::"r"(src), "r"(ydst), "r"(udst), "r"(vdst), "r" (num_pixels>>1)		: "memory", "%eax"	);#else	int i;	num_pixels>>=1;	for(i=0; i<num_pixels; i++)	{		 ydst[2*i+0] 	= src[4*i+0];		 udst[i] 	= src[4*i+1];		 ydst[2*i+1] 	= src[4*i+2];		 vdst[i] 	= src[4*i+3];	}#endif}