return srcSliceH;
static inline void RENAME(yuv420_rgb15)(SwsContext *c, uint8_t* srcParam[], int srcStrideParam[], int srcSliceY,             int srcSliceH, uint8_t* dst[], int dstStride[]){    int srcStride[3];    uint8_t *src[3];    int y, h_size;    sws_orderYUV(c->srcFormat, src, srcStride, srcParam, srcStrideParam);    if(c->srcFormat == IMGFMT_422P){	srcStride[1] *= 2;	srcStride[2] *= 2;    }    h_size= (c->dstW+7)&~7;    if(h_size*2 > dstStride[0]) h_size-=8;        __asm__ __volatile__ ("pxor %mm4, %mm4;" /* zero mm4 */ );//printf("%X %X %X %X %X %X %X %X %X %X\n", (int)&c->redDither, (int)&b5Dither, (int)src[0], (int)src[1], (int)src[2], (int)dst[0],//srcStride[0],srcStride[1],srcStride[2],dstStride[0]);    for (y= 0; y<srcSliceH; y++ ) {	uint8_t *_image = dst[0] + (y+srcSliceY)*dstStride[0];	uint8_t *_py = src[0] + y*srcStride[0];	uint8_t *_pu = src[1] + (y>>1)*srcStride[1];	uint8_t *_pv = src[2] + (y>>1)*srcStride[2];	int index= -h_size/2;	b5Dither= dither8[y&1];	g6Dither= dither4[y&1];	g5Dither= dither8[y&1];	r5Dither= dither8[(y+1)&1];	    /* this mmx assembly code deals with SINGLE scan line at a time, it convert 8	       pixels in each iteration */	    __asm__ __volatile__ (	/* load data for start of next scan line */		     "movd (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */		     "movd (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */		     "movq (%5, %0, 2), %%mm6;" /* Load 8  Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 *///		    ".balign 16			\n\t"		    "1:				\n\t"YUV2RGB#ifdef DITHER1XBPP			"paddusb "MANGLE(b5Dither)", %%mm0	\n\t"			"paddusb "MANGLE(g5Dither)", %%mm2	\n\t"			"paddusb "MANGLE(r5Dither)", %%mm1	\n\t"#endif		     /* mask unneeded bits off */		     "pand "MANGLE(mmx_redmask)", %%mm0;" /* b7b6b5b4 b3_0_0_0 b7b6b5b4 b3_0_0_0 */		     "pand "MANGLE(mmx_redmask)", %%mm2;" /* g7g6g5g4 g3_0_0_0 g7g6g5g4 g3_0_0_0 */		     "pand "MANGLE(mmx_redmask)", %%mm1;" /* r7r6r5r4 r3_0_0_0 r7r6r5r4 r3_0_0_0 */		     "psrlw $3,%%mm0;" /* 0_0_0_b7 b6b5b4b3 0_0_0_b7 b6b5b4b3 */		     "psrlw $1,%%mm1;"            /* 0_r7r6r5  r4r3_0_0 0_r7r6r5 r4r3_0_0 */		     "pxor %%mm4, %%mm4;" /* zero mm4 */		     "movq %%mm0, %%mm5;" /* Copy B7-B0 */		     "movq %%mm2, %%mm7;" /* Copy G7-G0 */		     /* convert rgb24 plane to rgb16 pack for pixel 0-3 */		     "punpcklbw %%mm4, %%mm2;" /* 0_0_0_0 0_0_0_0 g7g6g5g4 g3_0_0_0 */		     "punpcklbw %%mm1, %%mm0;" /* r7r6r5r4 r3_0_0_0 0_0_0_b7 b6b5b4b3 */		     "psllw $2, %%mm2;" /* 0_0_0_0 0_0_g7g6 g5g4g3_0 0_0_0_0 */		     "por %%mm2, %%mm0;" /* 0_r7r6r5 r4r3g7g6 g5g4g3b7 b6b5b4b3 */		     "movq 8 (%5, %0, 2), %%mm6;" /* Load 8 Y Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0 */		     MOVNTQ " %%mm0, (%1);" /* store pixel 0-3 */		     /* convert rgb24 plane to rgb16 pack for pixel 0-3 */		     "punpckhbw %%mm4, %%mm7;" /* 0_0_0_0 0_0_0_0 0_g7g6g5 g4g3_0_0 */		     "punpckhbw %%mm1, %%mm5;" /* r7r6r5r4 r3_0_0_0 0_0_0_b7 b6b5b4b3 */		     "psllw $2, %%mm7;" /* 0_0_0_0 0_0_g7g6 g5g4g3_0 0_0_0_0 */		     "movd 4 (%2, %0), %%mm0;" /* Load 4 Cb 00 00 00 00 u3 u2 u1 u0 */		     "por %%mm7, %%mm5;" /* 0_r7r6r5 r4r3g7g6 g5g4g3b7 b6b5b4b3 */		     "movd 4 (%3, %0), %%mm1;" /* Load 4 Cr 00 00 00 00 v3 v2 v1 v0 */		     MOVNTQ " %%mm5, 8 (%1);" /* store pixel 4-7 */		     		     "addl $16, %1			\n\t"		     "addl $4, %0			\n\t"		     " js 1b				\n\t"		     : "+r" (index), "+r" (_image)		     : "r" (_pu - index), "r" (_pv - index), "r"(&c->redDither), "r" (_py - 2*index)		     );    }    __asm__ __volatile__ (EMMS);}