swscale.c

ffmpeg移植到symbian的全部源代码

                    if (Y2>255)   Y2=255;
                    else if (Y2<0)Y2=0;
                }
                acc+= acc + g[Y1+d128[(i+0)&7]];
                acc+= acc + g[Y2+d128[(i+1)&7]];
                if ((i&7)==6){
                    ((uint8_t*)dest)[0]= acc;
                    dest++;
                }
            }
        }
        break;
    case PIX_FMT_YUYV422:
        YSCALE_YUV_2_PACKEDX_C(void)
            ((uint8_t*)dest)[2*i2+0]= Y1;
            ((uint8_t*)dest)[2*i2+1]= U;
            ((uint8_t*)dest)[2*i2+2]= Y2;
            ((uint8_t*)dest)[2*i2+3]= V;
        }
        break;
    case PIX_FMT_UYVY422:
        YSCALE_YUV_2_PACKEDX_C(void)
            ((uint8_t*)dest)[2*i2+0]= U;
            ((uint8_t*)dest)[2*i2+1]= Y1;
            ((uint8_t*)dest)[2*i2+2]= V;
            ((uint8_t*)dest)[2*i2+3]= Y2;
        }
        break;
    }
}


//Note: we have C, X86, MMX, MMX2, 3DNOW version therse no 3DNOW+MMX2 one
//Plain C versions
#if !defined (HAVE_MMX) || defined (RUNTIME_CPUDETECT) || !defined(CONFIG_GPL)
#define COMPILE_C
#endif

#ifdef ARCH_POWERPC
#if (defined (HAVE_ALTIVEC) || defined (RUNTIME_CPUDETECT)) && defined (CONFIG_GPL)
#define COMPILE_ALTIVEC
#endif //HAVE_ALTIVEC
#endif //ARCH_POWERPC

#if defined(ARCH_X86)

#if ((defined (HAVE_MMX) && !defined (HAVE_3DNOW) && !defined (HAVE_MMX2)) || defined (RUNTIME_CPUDETECT)) && defined (CONFIG_GPL)
#define COMPILE_MMX
#endif

#if (defined (HAVE_MMX2) || defined (RUNTIME_CPUDETECT)) && defined (CONFIG_GPL)
#define COMPILE_MMX2
#endif

#if ((defined (HAVE_3DNOW) && !defined (HAVE_MMX2)) || defined (RUNTIME_CPUDETECT)) && defined (CONFIG_GPL)
#define COMPILE_3DNOW
#endif
#endif //ARCH_X86 || ARCH_X86_64

#undef HAVE_MMX
#undef HAVE_MMX2
#undef HAVE_3DNOW

#ifdef COMPILE_C
#undef HAVE_MMX
#undef HAVE_MMX2
#undef HAVE_3DNOW
#undef HAVE_ALTIVEC
#define RENAME(a) a ## _C
#include "swscale_template.c"
#endif

#ifdef COMPILE_ALTIVEC
#undef RENAME
#define HAVE_ALTIVEC
#define RENAME(a) a ## _altivec
#include "swscale_template.c"
#endif

#if defined(ARCH_X86)

//X86 versions
/*
#undef RENAME
#undef HAVE_MMX
#undef HAVE_MMX2
#undef HAVE_3DNOW
#define ARCH_X86
#define RENAME(a) a ## _X86
#include "swscale_template.c"
*/
//MMX versions
#ifdef COMPILE_MMX
#undef RENAME
#define HAVE_MMX
#undef HAVE_MMX2
#undef HAVE_3DNOW
#define RENAME(a) a ## _MMX
#include "swscale_template.c"
#endif

//MMX2 versions
#ifdef COMPILE_MMX2
#undef RENAME
#define HAVE_MMX
#define HAVE_MMX2
#undef HAVE_3DNOW
#define RENAME(a) a ## _MMX2
#include "swscale_template.c"
#endif

//3DNOW versions
#ifdef COMPILE_3DNOW
#undef RENAME
#define HAVE_MMX
#undef HAVE_MMX2
#define HAVE_3DNOW
#define RENAME(a) a ## _3DNow
#include "swscale_template.c"
#endif

#endif //ARCH_X86 || ARCH_X86_64

// minor note: the HAVE_xyz is messed up after that line so don't use it

static double getSplineCoeff(double a, double b, double c, double d, double dist)
{
//    printf("%f %f %f %f %f\n", a,b,c,d,dist);
    if (dist<=1.0)      return ((d*dist + c)*dist + b)*dist +a;
    else                return getSplineCoeff(        0.0,
                                             b+ 2.0*c + 3.0*d,
                                                    c + 3.0*d,
                                            -b- 3.0*c - 6.0*d,
                                            dist-1.0);
}

static inline int initFilter(int16_t **outFilter, int16_t **filterPos, int *outFilterSize, int xInc,
                             int srcW, int dstW, int filterAlign, int one, int flags,
                             SwsVector *srcFilter, SwsVector *dstFilter, double param[2])
{
    int i;
    int filterSize;
    int filter2Size;
    int minFilterSize;
    double *filter=NULL;
    double *filter2=NULL;
#if defined(ARCH_X86)
    if (flags & SWS_CPU_CAPS_MMX)
        asm volatile("emms\n\t"::: "memory"); //FIXME this should not be required but it IS (even for non-MMX versions)
#endif

    // Note the +1 is for the MMXscaler which reads over the end
    *filterPos = av_malloc((dstW+1)*sizeof(int16_t));

    if (FFABS(xInc - 0x10000) <10) // unscaled
    {
        int i;
        filterSize= 1;
        filter= av_malloc(dstW*sizeof(double)*filterSize);
        for (i=0; i<dstW*filterSize; i++) filter[i]=0;

        for (i=0; i<dstW; i++)
        {
            filter[i*filterSize]=1;
            (*filterPos)[i]=i;
        }

    }
    else if (flags&SWS_POINT) // lame looking point sampling mode
    {
        int i;
        int xDstInSrc;
        filterSize= 1;
        filter= av_malloc(dstW*sizeof(double)*filterSize);

        xDstInSrc= xInc/2 - 0x8000;
        for (i=0; i<dstW; i++)
        {
            int xx= (xDstInSrc - ((filterSize-1)<<15) + (1<<15))>>16;

            (*filterPos)[i]= xx;
            filter[i]= 1.0;
            xDstInSrc+= xInc;
        }
    }
    else if ((xInc <= (1<<16) && (flags&SWS_AREA)) || (flags&SWS_FAST_BILINEAR)) // bilinear upscale
    {
        int i;
        int xDstInSrc;
        if      (flags&SWS_BICUBIC) filterSize= 4;
        else if (flags&SWS_X      ) filterSize= 4;
        else                        filterSize= 2; // SWS_BILINEAR / SWS_AREA
        filter= av_malloc(dstW*sizeof(double)*filterSize);

        xDstInSrc= xInc/2 - 0x8000;
        for (i=0; i<dstW; i++)
        {
            int xx= (xDstInSrc - ((filterSize-1)<<15) + (1<<15))>>16;
            int j;

            (*filterPos)[i]= xx;
                //Bilinear upscale / linear interpolate / Area averaging
                for (j=0; j<filterSize; j++)
                {
                    double d= FFABS((xx<<16) - xDstInSrc)/(double)(1<<16);
                    double coeff= 1.0 - d;
                    if (coeff<0) coeff=0;
                    filter[i*filterSize + j]= coeff;
                    xx++;
                }
            xDstInSrc+= xInc;
        }
    }
    else
    {
        double xDstInSrc;
        double sizeFactor, filterSizeInSrc;
        const double xInc1= (double)xInc / (double)(1<<16);

        if      (flags&SWS_BICUBIC)      sizeFactor=  4.0;
        else if (flags&SWS_X)            sizeFactor=  8.0;
        else if (flags&SWS_AREA)         sizeFactor=  1.0; //downscale only, for upscale it is bilinear
        else if (flags&SWS_GAUSS)        sizeFactor=  8.0;   // infinite ;)
        else if (flags&SWS_LANCZOS)      sizeFactor= param[0] != SWS_PARAM_DEFAULT ? 2.0*param[0] : 6.0;
        else if (flags&SWS_SINC)         sizeFactor= 20.0; // infinite ;)
        else if (flags&SWS_SPLINE)       sizeFactor= 20.0;  // infinite ;)
        else if (flags&SWS_BILINEAR)     sizeFactor=  2.0;
        else {
            sizeFactor= 0.0; //GCC warning killer
            assert(0);
        }

        if (xInc1 <= 1.0)       filterSizeInSrc= sizeFactor; // upscale
        else                    filterSizeInSrc= sizeFactor*srcW / (double)dstW;

        filterSize= (int)ceil(1 + filterSizeInSrc); // will be reduced later if possible
        if (filterSize > srcW-2) filterSize=srcW-2;

        filter= av_malloc(dstW*sizeof(double)*filterSize);

        xDstInSrc= xInc1 / 2.0 - 0.5;
        for (i=0; i<dstW; i++)
        {
            int xx= (int)(xDstInSrc - (filterSize-1)*0.5 + 0.5);
            int j;
            (*filterPos)[i]= xx;
            for (j=0; j<filterSize; j++)
            {
                double d= FFABS(xx - xDstInSrc)/filterSizeInSrc*sizeFactor;
                double coeff;
                if (flags & SWS_BICUBIC)
                {
                    double B= param[0] != SWS_PARAM_DEFAULT ? param[0] : 0.0;
                    double C= param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6;

                    if (d<1.0)
                        coeff = (12-9*B-6*C)*d*d*d + (-18+12*B+6*C)*d*d + 6-2*B;
                    else if (d<2.0)
                        coeff = (-B-6*C)*d*d*d + (6*B+30*C)*d*d + (-12*B-48*C)*d +8*B+24*C;
                    else
                        coeff=0.0;
                }
/*                else if (flags & SWS_X)
                {
                    double p= param ? param*0.01 : 0.3;
                    coeff = d ? sin(d*PI)/(d*PI) : 1.0;
                    coeff*= pow(2.0, - p*d*d);
                }*/
                else if (flags & SWS_X)
                {
                    double A= param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;

                    if (d<1.0)
                        coeff = cos(d*PI);
                    else
                        coeff=-1.0;
                    if (coeff<0.0)      coeff= -pow(-coeff, A);
                    else                coeff=  pow( coeff, A);
                    coeff= coeff*0.5 + 0.5;
                }
                else if (flags & SWS_AREA)
                {
                    double srcPixelSize= 1.0/xInc1;
                    if      (d + srcPixelSize/2 < 0.5) coeff= 1.0;
                    else if (d - srcPixelSize/2 < 0.5) coeff= (0.5-d)/srcPixelSize + 0.5;
                    else coeff=0.0;
                }
                else if (flags & SWS_GAUSS)
                {
                    double p= param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
                    coeff = pow(2.0, - p*d*d);
                }
                else if (flags & SWS_SINC)
                {
                    coeff = d ? sin(d*PI)/(d*PI) : 1.0;
                }
                else if (flags & SWS_LANCZOS)
                {
                    double p= param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
                    coeff = d ? sin(d*PI)*sin(d*PI/p)/(d*d*PI*PI/p) : 1.0;
                    if (d>p) coeff=0;
                }
                else if (flags & SWS_BILINEAR)
                {
                    coeff= 1.0 - d;
                    if (coeff<0) coeff=0;
                }
                else if (flags & SWS_SPLINE)
                {
                    double p=-2.196152422706632;
                    coeff = getSplineCoeff(1.0, 0.0, p, -p-1.0, d);
                }
                else {
                    coeff= 0.0; //GCC warning killer
                    assert(0);
                }

                filter[i*filterSize + j]= coeff;
                xx++;
            }
            xDstInSrc+= xInc1;
        }
    }

    /* apply src & dst Filter to filter -> filter2
       av_free(filter);
    */
    assert(filterSize>0);
    filter2Size= filterSize;
    if (srcFilter) filter2Size+= srcFilter->length - 1;
    if (dstFilter) filter2Size+= dstFilter->length - 1;
    assert(filter2Size>0);
    filter2= av_malloc(filter2Size*dstW*sizeof(double));

    for (i=0; i<dstW; i++)
    {
        int j;
        SwsVector scaleFilter;
        SwsVector *outVec;

        scaleFilter.coeff= filter + i*filterSize;
        scaleFilter.length= filterSize;

        if (srcFilter) outVec= sws_getConvVec(srcFilter, &scaleFilter);
        else           outVec= &scaleFilter;

        assert(outVec->length == filter2Size);
        //FIXME dstFilter

        for (j=0; j<outVec->length; j++)
        {
            filter2[i*filter2Size + j]= outVec->coeff[j];
        }

        (*filterPos)[i]+= (filterSize-1)/2 - (filter2Size-1)/2;

        if (outVec != &scaleFilter) sws_freeVec(outVec);
    }
    av_free(filter); filter=NULL;

    /* try to reduce the filter-size (step1 find size and shift left) */
    // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).
    minFilterSize= 0;
    for (i=dstW-1; i>=0; i--)
    {
        int min= filter2Size;
        int j;
        double cutOff=0.0;

        /* get rid off near zero elements on the left by shifting left */
        for (j=0; j<filter2Size; j++)
        {
            int k;
            cutOff += FFABS(filter2[i*filter2Size]);

            if (cutOff > SWS_MAX_REDUCE_CUTOFF) break;

            /* preserve monotonicity because the core can't handle the filter otherwise */
            if (i<dstW-1 && (*filterPos)[i] >= (*filterPos)[i+1]) break;

            // Move filter coeffs left
            for (k=1; k<filter2Size; k++)
                filter2[i*filter2Size + k - 1]= filter2[i*filter2Size + k];
            filter2[i*filter2Size + k - 1]= 0.0;
            (*filterPos)[i]++;
        }

        cutOff=0.0;
        /* count near zeros on the right */
        for (j=filter2Size-1; j>0; j--)
        {
            cutOff += FFABS(filter2[i*filter2Size + j]);

            if (cutOff > SWS_MAX_REDUCE_CUTOFF) break;