mc.c.svn-base

关于x.264视频格式源码

    uint8_t *src1 = src[hpel_ref0[qpel_idx]] + offset + ((mvy&3) == 3) * i_src_stride;

    if( qpel_idx & 5 ) /* qpel interpolation needed */
    {
        uint8_t *src2 = src[hpel_ref1[qpel_idx]] + offset + ((mvx&3) == 3);
        pixel_avg( dst, *i_dst_stride, src1, i_src_stride,
                   src2, i_src_stride, i_width, i_height );
        return dst;
    }
    else
    {
        *i_dst_stride = i_src_stride;
        return src1;
    }
}

/* full chroma mc (ie until 1/8 pixel)*/
static void motion_compensation_chroma( uint8_t *src, int i_src_stride,
                                        uint8_t *dst, int i_dst_stride,
                                        int mvx, int mvy,
                                        int i_width, int i_height )
{
    uint8_t *srcp;
    int x, y;

    const int d8x = mvx&0x07;
    const int d8y = mvy&0x07;

    const int cA = (8-d8x)*(8-d8y);
    const int cB = d8x    *(8-d8y);
    const int cC = (8-d8x)*d8y;
    const int cD = d8x    *d8y;

    src  += (mvy >> 3) * i_src_stride + (mvx >> 3);
    srcp = &src[i_src_stride];

    for( y = 0; y < i_height; y++ )
    {
        for( x = 0; x < i_width; x++ )
        {
            dst[x] = ( cA*src[x]  + cB*src[x+1] +
                       cC*srcp[x] + cD*srcp[x+1] + 32 ) >> 6;
        }
        dst  += i_dst_stride;

        src   = srcp;
        srcp += i_src_stride;
    }
}

#define MC_COPY(W) \
static void mc_copy_w##W( uint8_t *dst, int i_dst, uint8_t *src, int i_src, int i_height ) \
{ \
    mc_copy( src, i_src, dst, i_dst, W, i_height ); \
}
MC_COPY( 16 )
MC_COPY( 8 )
MC_COPY( 4 )

static void plane_copy( uint8_t *dst, int i_dst,
                        uint8_t *src, int i_src, int w, int h)
{
    while( h-- )
    {
        memcpy( dst, src, w );
        dst += i_dst;
        src += i_src;
    }
}

void prefetch_fenc_null( uint8_t *pix_y, int stride_y,
                         uint8_t *pix_uv, int stride_uv, int mb_x )
{}

void prefetch_ref_null( uint8_t *pix, int stride, int parity )
{}

void x264_mc_init( int cpu, x264_mc_functions_t *pf )
{
    pf->mc_luma   = mc_luma;
    pf->get_ref   = get_ref;
    pf->mc_chroma = motion_compensation_chroma;

    pf->avg[PIXEL_16x16]= pixel_avg_16x16;
    pf->avg[PIXEL_16x8] = pixel_avg_16x8;
    pf->avg[PIXEL_8x16] = pixel_avg_8x16;
    pf->avg[PIXEL_8x8]  = pixel_avg_8x8;
    pf->avg[PIXEL_8x4]  = pixel_avg_8x4;
    pf->avg[PIXEL_4x8]  = pixel_avg_4x8;
    pf->avg[PIXEL_4x4]  = pixel_avg_4x4;
    pf->avg[PIXEL_4x2]  = pixel_avg_4x2;
    pf->avg[PIXEL_2x4]  = pixel_avg_2x4;
    pf->avg[PIXEL_2x2]  = pixel_avg_2x2;
    
    pf->avg_weight[PIXEL_16x16]= pixel_avg_weight_16x16;
    pf->avg_weight[PIXEL_16x8] = pixel_avg_weight_16x8;
    pf->avg_weight[PIXEL_8x16] = pixel_avg_weight_8x16;
    pf->avg_weight[PIXEL_8x8]  = pixel_avg_weight_8x8;
    pf->avg_weight[PIXEL_8x4]  = pixel_avg_weight_8x4;
    pf->avg_weight[PIXEL_4x8]  = pixel_avg_weight_4x8;
    pf->avg_weight[PIXEL_4x4]  = pixel_avg_weight_4x4;
    pf->avg_weight[PIXEL_4x2]  = pixel_avg_weight_4x2;
    pf->avg_weight[PIXEL_2x4]  = pixel_avg_weight_2x4;
    pf->avg_weight[PIXEL_2x2]  = pixel_avg_weight_2x2;

    pf->copy[PIXEL_16x16] = mc_copy_w16;
    pf->copy[PIXEL_8x8]   = mc_copy_w8;
    pf->copy[PIXEL_4x4]   = mc_copy_w4;

    pf->plane_copy = plane_copy;

    pf->prefetch_fenc = prefetch_fenc_null;
    pf->prefetch_ref  = prefetch_ref_null;

#ifdef HAVE_MMX
    if( cpu&X264_CPU_MMXEXT ) {
        x264_mc_mmxext_init( pf );
        pf->mc_chroma = x264_mc_chroma_mmxext;
    }
    if( cpu&X264_CPU_SSE2 )
        x264_mc_sse2_init( pf );
#endif
#ifdef ARCH_PPC
    if( cpu&X264_CPU_ALTIVEC )
        x264_mc_altivec_init( pf );
#endif
}

extern void x264_hpel_filter_mmxext( uint8_t *dsth, uint8_t *dstv, uint8_t *dstc, uint8_t *src,
                                     int i_stride, int i_width, int i_height );

void x264_frame_filter( int cpu, x264_frame_t *frame, int b_interlaced, int mb_y, int b_end )
{
    const int x_inc = 16, y_inc = 16;
    const int stride = frame->i_stride[0] << b_interlaced;
    int start = (mb_y*16 >> b_interlaced) - 8;
    int height = ((b_end ? frame->i_lines[0] : mb_y*16) >> b_interlaced) + 8;
    int x, y;

    if( mb_y & b_interlaced )
        return;
    mb_y >>= b_interlaced;

#ifdef HAVE_MMX
    if ( cpu & X264_CPU_MMXEXT )
    {
        // buffer = 4 for deblock + 3 for 6tap, rounded to 8
        int offs = start*stride - 8;
        x264_hpel_filter_mmxext(
            frame->filtered[1] + offs,
            frame->filtered[2] + offs,
            frame->filtered[3] + offs,
            frame->plane[0] + offs,
            stride, stride - 48, height - start );
    }
    else
#endif
    {
        for( y = start; y < height; y += y_inc )
        {
            uint8_t *p_in = frame->plane[0] + y * stride - 8;
            uint8_t *p_h  = frame->filtered[1] + y * stride - 8;
            uint8_t *p_v  = frame->filtered[2] + y * stride - 8;
            uint8_t *p_c  = frame->filtered[3] + y * stride - 8;
            for( x = -8; x < stride - 64 + 8; x += x_inc )
            {
                mc_hh( p_in, stride, p_h, stride, x_inc, y_inc );
                mc_hv( p_in, stride, p_v, stride, x_inc, y_inc );
                mc_hc( p_in, stride, p_c, stride, x_inc, y_inc );

                p_h += x_inc;
                p_v += x_inc;
                p_c += x_inc;
                p_in += x_inc;
            }
        }
    }

    /* generate integral image:
     * frame->integral contains 2 planes. in the upper plane, each element is
     * the sum of an 8x8 pixel region with top-left corner on that point.
     * in the lower plane, 4x4 sums (needed only with --partitions p4x4). */

    if( frame->integral )
    {
        if( start < 0 )
        {
            memset( frame->integral - 32 * stride - 32, 0, stride * sizeof(uint16_t) );
            start = -32;
        }
        if( b_end )
            height += 24;
        for( y = start; y < height; y++ )
        {
            uint8_t  *ref  = frame->plane[0] + y * stride - 32;
            uint16_t *line = frame->integral + (y+1) * stride - 31;
            uint16_t v = line[0] = 0;
            for( x = 0; x < stride-1; x++ )
                line[x] = v += ref[x] + line[x-stride] - line[x-stride-1];
            line -= 8*stride;
            if( y >= 8-31 )
            {
                uint16_t *sum4 = line + frame->i_stride[0] * (frame->i_lines[0] + 64);
                for( x = 1; x < stride-8; x++, line++, sum4++ )
                {
                    sum4[0] =  line[4+4*stride] - line[4] - line[4*stride] + line[0];
                    line[0] += line[8+8*stride] - line[8] - line[8*stride];
                }
            }
        }
    }
}

void x264_frame_init_lowres( int cpu, x264_frame_t *frame )
{
    // FIXME: tapfilter?
    const int i_stride = frame->i_stride[0];
    const int i_stride2 = frame->i_stride_lowres;
    const int i_width2 = i_stride2 - 64;
    int x, y, i;
    for( y = 0; y < frame->i_lines_lowres - 1; y++ )
    {
        uint8_t *src0 = &frame->plane[0][2*y*i_stride];
        uint8_t *src1 = src0+i_stride;
        uint8_t *src2 = src1+i_stride;
        uint8_t *dst0 = &frame->lowres[0][y*i_stride2];
        uint8_t *dsth = &frame->lowres[1][y*i_stride2];
        uint8_t *dstv = &frame->lowres[2][y*i_stride2];
        uint8_t *dstc = &frame->lowres[3][y*i_stride2];
        for( x = 0; x < i_width2 - 1; x++ )
        {
            dst0[x] = (src0[2*x  ] + src0[2*x+1] + src1[2*x  ] + src1[2*x+1] + 2) >> 2;
            dsth[x] = (src0[2*x+1] + src0[2*x+2] + src1[2*x+1] + src1[2*x+2] + 2) >> 2;
            dstv[x] = (src1[2*x  ] + src1[2*x+1] + src2[2*x  ] + src2[2*x+1] + 2) >> 2;
            dstc[x] = (src1[2*x+1] + src1[2*x+2] + src2[2*x+1] + src2[2*x+2] + 2) >> 2;
        }
        dst0[x] = (src0[2*x  ] + src0[2*x+1] + src1[2*x  ] + src1[2*x+1] + 2) >> 2;
        dstv[x] = (src1[2*x  ] + src1[2*x+1] + src2[2*x  ] + src2[2*x+1] + 2) >> 2;
        dsth[x] = (src0[2*x+1] + src1[2*x+1] + 1) >> 1;
        dstc[x] = (src1[2*x+1] + src2[2*x+1] + 1) >> 1;
    }
    for( i = 0; i < 4; i++ )
        memcpy( &frame->lowres[i][y*i_stride2], &frame->lowres[i][(y-1)*i_stride2], i_width2 );

    for( y = 0; y < 16; y++ )
        for( x = 0; x < 16; x++ )
            frame->i_cost_est[x][y] = -1;

    x264_frame_expand_border_lowres( frame );
}