snow.c

从FFMPEG转换而来的H264解码程序,VC下编译..

    }
    if(width&1)
        temp[x   ]= b[2*x    ];
    memcpy(b, temp, width*sizeof(int));
}

static void horizontal_composeX(DWTELEM *b, int width){
    DWTELEM temp[width];
    const int width2= width>>1;
    int x;
    const int w2= (width+1)>>1;

    memcpy(temp, b, width*sizeof(int));
    for(x=0; x<width2; x++){
        b[2*x    ]= temp[x   ];
        b[2*x + 1]= temp[x+w2];
    }
    if(width&1)
        b[2*x    ]= temp[x   ];

    inplace_lift(b, width, COEFFS4, N4, SHIFT4, LX0, 1);
    inplace_lift(b, width, COEFFS3, N3, SHIFT3, LX1, 1);
    inplace_lift(b, width, COEFFS2, N2, SHIFT2, LX0, 1);
    inplace_lift(b, width, COEFFS1, N1, SHIFT1, LX1, 1);
}

static void spatial_decomposeX(DWTELEM *buffer, int width, int height, int stride){
    int x, y;

    for(y=0; y<height; y++){
        for(x=0; x<width; x++){
            buffer[y*stride + x] *= SCALEX;
        }
    }

    for(y=0; y<height; y++){
        horizontal_decomposeX(buffer + y*stride, width);
    }

    inplace_liftV(buffer, width, height, stride, COEFFS1, N1, SHIFT1, LX1, 0);
    inplace_liftV(buffer, width, height, stride, COEFFS2, N2, SHIFT2, LX0, 0);
    inplace_liftV(buffer, width, height, stride, COEFFS3, N3, SHIFT3, LX1, 0);
    inplace_liftV(buffer, width, height, stride, COEFFS4, N4, SHIFT4, LX0, 0);
}

static void spatial_composeX(DWTELEM *buffer, int width, int height, int stride){
    int x, y;

    inplace_liftV(buffer, width, height, stride, COEFFS4, N4, SHIFT4, LX0, 1);
    inplace_liftV(buffer, width, height, stride, COEFFS3, N3, SHIFT3, LX1, 1);
    inplace_liftV(buffer, width, height, stride, COEFFS2, N2, SHIFT2, LX0, 1);
    inplace_liftV(buffer, width, height, stride, COEFFS1, N1, SHIFT1, LX1, 1);

    for(y=0; y<height; y++){
        horizontal_composeX(buffer + y*stride, width);
    }

    for(y=0; y<height; y++){
        for(x=0; x<width; x++){
            buffer[y*stride + x] /= SCALEX;
        }
    }
}

static void horizontal_decompose53i(DWTELEM *b, int width){
    DWTELEM temp[width];
    const int width2= width>>1;
    int x;
    const int w2= (width+1)>>1;

    for(x=0; x<width2; x++){
        temp[x   ]= b[2*x    ];
        temp[x+w2]= b[2*x + 1];
    }
    if(width&1)
        temp[x   ]= b[2*x    ];

    lift(b+w2, temp+w2, temp, 1, 1, 1, width, -1, 0, 1, 1, 0);
    lift(b   , temp   , b+w2, 1, 1, 1, width,  1, 2, 2, 0, 0);
}

static void vertical_decompose53iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] -= (b0[i] + b2[i])>>1;
    }
}

static void vertical_decompose53iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] += (b0[i] + b2[i] + 2)>>2;
    }
}

static void spatial_decompose53i(DWTELEM *buffer, int width, int height, int stride){
    int y;
    DWTELEM *b0= buffer + mirror(-2-1, height-1)*stride;
    DWTELEM *b1= buffer + mirror(-2  , height-1)*stride;

    for(y=-2; y<height; y+=2){
        DWTELEM *b2= buffer + mirror(y+1, height-1)*stride;
        DWTELEM *b3= buffer + mirror(y+2, height-1)*stride;

        if(y+1<(unsigned)height) horizontal_decompose53i(b2, width);
        if(y+2<(unsigned)height) horizontal_decompose53i(b3, width);

        if(y+1<(unsigned)height) vertical_decompose53iH0(b1, b2, b3, width);
        if(y+0<(unsigned)height) vertical_decompose53iL0(b0, b1, b2, width);

        b0=b2;
        b1=b3;
    }
}

static void horizontal_decompose97i(DWTELEM *b, int width){
    DWTELEM temp[width];
    const int w2= (width+1)>>1;

    lift (temp+w2, b    +1, b      , 1, 2, 2, width, -W_AM, W_AO, W_AS, 1, 0);
    liftS(temp   , b      , temp+w2, 1, 2, 1, width, -W_BM, W_BO, W_BS, 0, 0);
    lift5(b   +w2, temp+w2, temp   , 1, 1, 1, width,  W_CM, W_CO, W_CS, 1, 0);
    lift (b      , temp   , b   +w2, 1, 1, 1, width,  W_DM, W_DO, W_DS, 0, 0);
}


static void vertical_decompose97iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] -= (W_AM*(b0[i] + b2[i])+W_AO)>>W_AS;
    }
}

static void vertical_decompose97iH1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
#ifdef lift5
        b1[i] += (W_CM*(b0[i] + b2[i])+W_CO)>>W_CS;
#else
        int r= 3*(b0[i] + b2[i]);
        r+= r>>4;
        r+= r>>8;
        b1[i] += (r+W_CO)>>W_CS;
#endif
    }
}

static void vertical_decompose97iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
#ifdef liftS
        b1[i] -= (W_BM*(b0[i] + b2[i])+W_BO)>>W_BS;
#else
        b1[i] = (16*4*b1[i] - 4*(b0[i] + b2[i]) + 8*5 + (5<<27)) / (5*16) - (1<<23);
#endif
    }
}

static void vertical_decompose97iL1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] += (W_DM*(b0[i] + b2[i])+W_DO)>>W_DS;
    }
}

static void spatial_decompose97i(DWTELEM *buffer, int width, int height, int stride){
    int y;
    DWTELEM *b0= buffer + mirror(-4-1, height-1)*stride;
    DWTELEM *b1= buffer + mirror(-4  , height-1)*stride;
    DWTELEM *b2= buffer + mirror(-4+1, height-1)*stride;
    DWTELEM *b3= buffer + mirror(-4+2, height-1)*stride;

    for(y=-4; y<height; y+=2){
        DWTELEM *b4= buffer + mirror(y+3, height-1)*stride;
        DWTELEM *b5= buffer + mirror(y+4, height-1)*stride;

        if(y+3<(unsigned)height) horizontal_decompose97i(b4, width);
        if(y+4<(unsigned)height) horizontal_decompose97i(b5, width);

        if(y+3<(unsigned)height) vertical_decompose97iH0(b3, b4, b5, width);
        if(y+2<(unsigned)height) vertical_decompose97iL0(b2, b3, b4, width);
        if(y+1<(unsigned)height) vertical_decompose97iH1(b1, b2, b3, width);
        if(y+0<(unsigned)height) vertical_decompose97iL1(b0, b1, b2, width);

        b0=b2;
        b1=b3;
        b2=b4;
        b3=b5;
    }
}

void ff_spatial_dwt(DWTELEM *buffer, int width, int height, int stride, int type, int decomposition_count){
    int level;

    for(level=0; level<decomposition_count; level++){
        switch(type){
        case DWT_97: spatial_decompose97i(buffer, width>>level, height>>level, stride<<level); break;
        case DWT_53: spatial_decompose53i(buffer, width>>level, height>>level, stride<<level); break;
        case DWT_X: spatial_decomposeX  (buffer, width>>level, height>>level, stride<<level); break;
        }
    }
}

static void horizontal_compose53i(DWTELEM *b, int width){
    DWTELEM temp[width];
    const int width2= width>>1;
    const int w2= (width+1)>>1;
    int x;

    lift(temp   , b   , b+w2, 1, 1, 1, width,  1, 2, 2, 0, 1);
    lift(temp+w2, b+w2, temp, 1, 1, 1, width, -1, 0, 1, 1, 1);

    for(x=0; x<width2; x++){
        b[2*x    ]= temp[x   ];
        b[2*x + 1]= temp[x+w2];
    }
    if(width&1)
        b[2*x    ]= temp[x   ];
}

static void vertical_compose53iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] += (b0[i] + b2[i])>>1;
    }
}

static void vertical_compose53iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] -= (b0[i] + b2[i] + 2)>>2;
    }
}

static void spatial_compose53i_buffered_init(dwt_compose_t *cs, slice_buffer * sb, int height, int stride_line){
    cs->b0 = slice_buffer_get_line(sb, mirror(-1-1, height-1) * stride_line);
    cs->b1 = slice_buffer_get_line(sb, mirror(-1  , height-1) * stride_line);
    cs->y = -1;
}

static void spatial_compose53i_init(dwt_compose_t *cs, DWTELEM *buffer, int height, int stride){
    cs->b0 = buffer + mirror(-1-1, height-1)*stride;
    cs->b1 = buffer + mirror(-1  , height-1)*stride;
    cs->y = -1;
}

static void spatial_compose53i_dy_buffered(dwt_compose_t *cs, slice_buffer * sb, int width, int height, int stride_line){
    int y= cs->y;

    DWTELEM *b0= cs->b0;
    DWTELEM *b1= cs->b1;
    DWTELEM *b2= slice_buffer_get_line(sb, mirror(y+1, height-1) * stride_line);
    DWTELEM *b3= slice_buffer_get_line(sb, mirror(y+2, height-1) * stride_line);

        if(y+1<(unsigned)height) vertical_compose53iL0(b1, b2, b3, width);
        if(y+0<(unsigned)height) vertical_compose53iH0(b0, b1, b2, width);

        if(y-1<(unsigned)height) horizontal_compose53i(b0, width);
        if(y+0<(unsigned)height) horizontal_compose53i(b1, width);

    cs->b0 = b2;
    cs->b1 = b3;
    cs->y += 2;
}

static void spatial_compose53i_dy(dwt_compose_t *cs, DWTELEM *buffer, int width, int height, int stride){
    int y= cs->y;
    DWTELEM *b0= cs->b0;
    DWTELEM *b1= cs->b1;
    DWTELEM *b2= buffer + mirror(y+1, height-1)*stride;
    DWTELEM *b3= buffer + mirror(y+2, height-1)*stride;

        if(y+1<(unsigned)height) vertical_compose53iL0(b1, b2, b3, width);
        if(y+0<(unsigned)height) vertical_compose53iH0(b0, b1, b2, width);

        if(y-1<(unsigned)height) horizontal_compose53i(b0, width);
        if(y+0<(unsigned)height) horizontal_compose53i(b1, width);

    cs->b0 = b2;
    cs->b1 = b3;
    cs->y += 2;
}

static void spatial_compose53i(DWTELEM *buffer, int width, int height, int stride){
    dwt_compose_t cs;
    spatial_compose53i_init(&cs, buffer, height, stride);
    while(cs.y <= height)
        spatial_compose53i_dy(&cs, buffer, width, height, stride);
}


void ff_snow_horizontal_compose97i(DWTELEM *b, int width){
    DWTELEM temp[width];
    const int w2= (width+1)>>1;

    lift (temp   , b      , b   +w2, 1, 1, 1, width,  W_DM, W_DO, W_DS, 0, 1);
    lift5(temp+w2, b   +w2, temp   , 1, 1, 1, width,  W_CM, W_CO, W_CS, 1, 1);
    liftS(b      , temp   , temp+w2, 2, 1, 1, width, -W_BM, W_BO, W_BS, 0, 1);
    lift (b+1    , temp+w2, b      , 2, 1, 2, width, -W_AM, W_AO, W_AS, 1, 1);
}

static void vertical_compose97iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] += (W_AM*(b0[i] + b2[i])+W_AO)>>W_AS;
    }
}

static void vertical_compose97iH1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
#ifdef lift5
        b1[i] -= (W_CM*(b0[i] + b2[i])+W_CO)>>W_CS;
#else
        int r= 3*(b0[i] + b2[i]);
        r+= r>>4;
        r+= r>>8;
        b1[i] -= (r+W_CO)>>W_CS;
#endif
    }
}

static void vertical_compose97iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
#ifdef liftS
        b1[i] += (W_BM*(b0[i] + b2[i])+W_BO)>>W_BS;
#else
        b1[i] += (W_BM*(b0[i] + b2[i])+4*b1[i]+W_BO)>>W_BS;
#endif
    }
}

static void vertical_compose97iL1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, int width){
    int i;

    for(i=0; i<width; i++){
        b1[i] -= (W_DM*(b0[i] + b2[i])+W_DO)>>W_DS;
    }
}

void ff_snow_vertical_compose97i(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2, DWTELEM *b3, DWTELEM *b4, DWTELEM *b5, int width){
    int i;

    for(i=0; i<width; i++){
#ifndef lift5
        int r;
#endif
        b4[i] -= (W_DM*(b3[i] + b5[i])+W_DO)>>W_DS;
#ifdef lift5
        b3[i] -= (W_CM*(b2[i] + b4[i])+W_CO)>>W_CS;
#else
        r= 3*(b2[i] + b4[i]);
        r+= r>>4;
        r+= r>>8;
        b3[i] -= (r+W_CO)>>W_CS;
#endif
#ifdef liftS