swscale_template.c

ffmpeg的完整源代码和作者自己写的文档。不但有在Linux的工程哦

    "psllq     $8, %%mm3        \n\t" /* G2        G1       G0    */\
    "por    %%mm1, %%mm6        \n\t"\
    "por    %%mm3, %%mm6        \n\t"\
    MOVNTQ(%%mm6, (dst))\
\
    "psrlq     $8, %%mm4        \n\t" /* 00 G7 G6 G5  G4 G3 G2 G1 */\
    "pshufw $0xA5, %%mm2, %%mm1 \n\t" /* B5 B4 B5 B4  B3 B2 B3 B2 */\
    "pshufw $0x55, %%mm4, %%mm3 \n\t" /* G4 G3 G4 G3  G4 G3 G4 G3 */\
    "pshufw $0xA5, %%mm5, %%mm6 \n\t" /* R5 R4 R5 R4  R3 R2 R3 R2 */\
\
    "pand "MANGLE(M24B)", %%mm1 \n\t" /* B5       B4        B3    */\
    "pand   %%mm7, %%mm3        \n\t" /*       G4        G3       */\
    "pand   %%mm0, %%mm6        \n\t" /*    R4        R3       R2 */\
\
    "por    %%mm1, %%mm3        \n\t" /* B5    G4 B4     G3 B3    */\
    "por    %%mm3, %%mm6        \n\t"\
    MOVNTQ(%%mm6, 8(dst))\
\
    "pshufw $0xFF, %%mm2, %%mm1 \n\t" /* B7 B6 B7 B6  B7 B6 B6 B7 */\
    "pshufw $0xFA, %%mm4, %%mm3 \n\t" /* 00 G7 00 G7  G6 G5 G6 G5 */\
    "pshufw $0xFA, %%mm5, %%mm6 \n\t" /* R7 R6 R7 R6  R5 R4 R5 R4 */\
\
    "pand   %%mm7, %%mm1        \n\t" /*       B7        B6       */\
    "pand   %%mm0, %%mm3        \n\t" /*    G7        G6       G5 */\
    "pand "MANGLE(M24B)", %%mm6 \n\t" /* R7       R6        R5    */\
\
    "por    %%mm1, %%mm3        \n\t"\
    "por    %%mm3, %%mm6        \n\t"\
    MOVNTQ(%%mm6, 16(dst))\
\
    "add      $24, "#dst"       \n\t"\
\
    "add       $8, "#index"     \n\t"\
    "cmp  "#dstw", "#index"     \n\t"\
    " jb       1b               \n\t"

#ifdef HAVE_MMX2
#undef WRITEBGR24
#define WRITEBGR24(dst, dstw, index)  WRITEBGR24MMX2(dst, dstw, index)
#else
#undef WRITEBGR24
#define WRITEBGR24(dst, dstw, index)  WRITEBGR24MMX(dst, dstw, index)
#endif

#define REAL_WRITEYUY2(dst, dstw, index) \
    "packuswb  %%mm3, %%mm3     \n\t"\
    "packuswb  %%mm4, %%mm4     \n\t"\
    "packuswb  %%mm7, %%mm1     \n\t"\
    "punpcklbw %%mm4, %%mm3     \n\t"\
    "movq      %%mm1, %%mm7     \n\t"\
    "punpcklbw %%mm3, %%mm1     \n\t"\
    "punpckhbw %%mm3, %%mm7     \n\t"\
\
    MOVNTQ(%%mm1, (dst, index, 2))\
    MOVNTQ(%%mm7, 8(dst, index, 2))\
\
    "add          $8, "#index"  \n\t"\
    "cmp     "#dstw", "#index"  \n\t"\
    " jb          1b            \n\t"
#define WRITEYUY2(dst, dstw, index)  REAL_WRITEYUY2(dst, dstw, index)


static inline void RENAME(yuv2yuvX)(SwsContext *c, int16_t *lumFilter, int16_t **lumSrc, int lumFilterSize,
                                    int16_t *chrFilter, int16_t **chrSrc, int chrFilterSize,
                                    uint8_t *dest, uint8_t *uDest, uint8_t *vDest, long dstW, long chrDstW)
{
#ifdef HAVE_MMX
    if (c->flags & SWS_ACCURATE_RND){
        if (uDest){
            YSCALEYUV2YV12X_ACCURATE(   0, CHR_MMX_FILTER_OFFSET, uDest, chrDstW)
            YSCALEYUV2YV12X_ACCURATE(4096, CHR_MMX_FILTER_OFFSET, vDest, chrDstW)
        }

        YSCALEYUV2YV12X_ACCURATE(0, LUM_MMX_FILTER_OFFSET, dest, dstW)
    }else{
        if (uDest){
            YSCALEYUV2YV12X(   0, CHR_MMX_FILTER_OFFSET, uDest, chrDstW)
            YSCALEYUV2YV12X(4096, CHR_MMX_FILTER_OFFSET, vDest, chrDstW)
        }

        YSCALEYUV2YV12X(0, LUM_MMX_FILTER_OFFSET, dest, dstW)
    }
#else
#ifdef HAVE_ALTIVEC
yuv2yuvX_altivec_real(lumFilter, lumSrc, lumFilterSize,
                      chrFilter, chrSrc, chrFilterSize,
                      dest, uDest, vDest, dstW, chrDstW);
#else //HAVE_ALTIVEC
yuv2yuvXinC(lumFilter, lumSrc, lumFilterSize,
            chrFilter, chrSrc, chrFilterSize,
            dest, uDest, vDest, dstW, chrDstW);
#endif //!HAVE_ALTIVEC
#endif
}

static inline void RENAME(yuv2nv12X)(SwsContext *c, int16_t *lumFilter, int16_t **lumSrc, int lumFilterSize,
                                     int16_t *chrFilter, int16_t **chrSrc, int chrFilterSize,
                                     uint8_t *dest, uint8_t *uDest, int dstW, int chrDstW, int dstFormat)
{
yuv2nv12XinC(lumFilter, lumSrc, lumFilterSize,
             chrFilter, chrSrc, chrFilterSize,
             dest, uDest, dstW, chrDstW, dstFormat);
}

static inline void RENAME(yuv2yuv1)(int16_t *lumSrc, int16_t *chrSrc,
                                    uint8_t *dest, uint8_t *uDest, uint8_t *vDest, long dstW, long chrDstW)
{
#ifdef HAVE_MMX
    if (uDest != NULL)
    {
        asm volatile(
            YSCALEYUV2YV121
            :: "r" (chrSrc + chrDstW), "r" (uDest + chrDstW),
            "g" (-chrDstW)
            : "%"REG_a
        );

        asm volatile(
            YSCALEYUV2YV121
            :: "r" (chrSrc + 2048 + chrDstW), "r" (vDest + chrDstW),
            "g" (-chrDstW)
            : "%"REG_a
        );
    }

    asm volatile(
        YSCALEYUV2YV121
        :: "r" (lumSrc + dstW), "r" (dest + dstW),
        "g" (-dstW)
        : "%"REG_a
    );
#else
    int i;
    for (i=0; i<dstW; i++)
    {
        int val= lumSrc[i]>>7;

        if (val&256){
            if (val<0) val=0;
            else       val=255;
        }

        dest[i]= val;
    }

    if (uDest != NULL)
        for (i=0; i<chrDstW; i++)
        {
            int u=chrSrc[i]>>7;
            int v=chrSrc[i + 2048]>>7;

            if ((u|v)&256){
                if (u<0)        u=0;
                else if (u>255) u=255;
                if (v<0)        v=0;
                else if (v>255) v=255;
            }

            uDest[i]= u;
            vDest[i]= v;
        }
#endif
}


/**
 * vertical scale YV12 to RGB
 */
static inline void RENAME(yuv2packedX)(SwsContext *c, int16_t *lumFilter, int16_t **lumSrc, int lumFilterSize,
                                       int16_t *chrFilter, int16_t **chrSrc, int chrFilterSize,
                                       uint8_t *dest, long dstW, long dstY)
{
#ifdef HAVE_MMX
    long dummy=0;
    if (c->flags & SWS_ACCURATE_RND){
        switch(c->dstFormat){
        case PIX_FMT_RGB32:
            YSCALEYUV2PACKEDX_ACCURATE
            YSCALEYUV2RGBX
            WRITEBGR32(%4, %5, %%REGa)

            YSCALEYUV2PACKEDX_END
            return;
        case PIX_FMT_BGR24:
            YSCALEYUV2PACKEDX_ACCURATE
            YSCALEYUV2RGBX
            "lea (%%"REG_a", %%"REG_a", 2), %%"REG_c"\n\t" //FIXME optimize
            "add %4, %%"REG_c"                        \n\t"
            WRITEBGR24(%%REGc, %5, %%REGa)


            :: "r" (&c->redDither),
               "m" (dummy), "m" (dummy), "m" (dummy),
               "r" (dest), "m" (dstW)
            : "%"REG_a, "%"REG_c, "%"REG_d, "%"REG_S
            );
            return;
        case PIX_FMT_BGR555:
            YSCALEYUV2PACKEDX_ACCURATE
            YSCALEYUV2RGBX
            /* mm2=B, %%mm4=G, %%mm5=R, %%mm7=0 */
#ifdef DITHER1XBPP
            "paddusb "MANGLE(b5Dither)", %%mm2\n\t"
            "paddusb "MANGLE(g5Dither)", %%mm4\n\t"
            "paddusb "MANGLE(r5Dither)", %%mm5\n\t"
#endif

            WRITEBGR15(%4, %5, %%REGa)
            YSCALEYUV2PACKEDX_END
            return;
        case PIX_FMT_BGR565:
            YSCALEYUV2PACKEDX_ACCURATE
            YSCALEYUV2RGBX
            /* mm2=B, %%mm4=G, %%mm5=R, %%mm7=0 */
#ifdef DITHER1XBPP
            "paddusb "MANGLE(b5Dither)", %%mm2\n\t"
            "paddusb "MANGLE(g6Dither)", %%mm4\n\t"
            "paddusb "MANGLE(r5Dither)", %%mm5\n\t"
#endif

            WRITEBGR16(%4, %5, %%REGa)
            YSCALEYUV2PACKEDX_END
            return;
        case PIX_FMT_YUYV422:
            YSCALEYUV2PACKEDX_ACCURATE
            /* mm2=B, %%mm4=G, %%mm5=R, %%mm7=0 */

            "psraw $3, %%mm3    \n\t"
            "psraw $3, %%mm4    \n\t"
            "psraw $3, %%mm1    \n\t"
            "psraw $3, %%mm7    \n\t"
            WRITEYUY2(%4, %5, %%REGa)
            YSCALEYUV2PACKEDX_END
            return;
    }
    }else{
        switch(c->dstFormat)
        {
        case PIX_FMT_RGB32:
            YSCALEYUV2PACKEDX
            YSCALEYUV2RGBX
            WRITEBGR32(%4, %5, %%REGa)
            YSCALEYUV2PACKEDX_END
            return;
        case PIX_FMT_BGR24:
            YSCALEYUV2PACKEDX
            YSCALEYUV2RGBX
            "lea (%%"REG_a", %%"REG_a", 2), %%"REG_c"   \n\t" //FIXME optimize
            "add                        %4, %%"REG_c"   \n\t"
            WRITEBGR24(%%REGc, %5, %%REGa)

            :: "r" (&c->redDither),
               "m" (dummy), "m" (dummy), "m" (dummy),
               "r" (dest),  "m" (dstW)
            : "%"REG_a, "%"REG_c, "%"REG_d, "%"REG_S
            );
            return;
        case PIX_FMT_BGR555:
            YSCALEYUV2PACKEDX
            YSCALEYUV2RGBX
            /* mm2=B, %%mm4=G, %%mm5=R, %%mm7=0 */
#ifdef DITHER1XBPP
            "paddusb "MANGLE(b5Dither)", %%mm2  \n\t"
            "paddusb "MANGLE(g5Dither)", %%mm4  \n\t"
            "paddusb "MANGLE(r5Dither)", %%mm5  \n\t"
#endif

            WRITEBGR15(%4, %5, %%REGa)
            YSCALEYUV2PACKEDX_END
            return;
        case PIX_FMT_BGR565:
            YSCALEYUV2PACKEDX
            YSCALEYUV2RGBX
            /* mm2=B, %%mm4=G, %%mm5=R, %%mm7=0 */
#ifdef DITHER1XBPP
            "paddusb "MANGLE(b5Dither)", %%mm2  \n\t"
            "paddusb "MANGLE(g6Dither)", %%mm4  \n\t"
            "paddusb "MANGLE(r5Dither)", %%mm5  \n\t"
#endif

            WRITEBGR16(%4, %5, %%REGa)
            YSCALEYUV2PACKEDX_END
            return;
        case PIX_FMT_YUYV422:
            YSCALEYUV2PACKEDX
            /* mm2=B, %%mm4=G, %%mm5=R, %%mm7=0 */

            "psraw $3, %%mm3    \n\t"
            "psraw $3, %%mm4    \n\t"