predict.c

X264的纯C语言的的原码

/*****************************************************************************
 * predict.c: h264 encoder
 *****************************************************************************
 * Copyright (C) 2003 Laurent Aimar
 * $Id: predict.c,v 1.1 2004/06/03 19:27:07 fenrir Exp $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Loren Merritt <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/* predict4x4 are inspired from ffmpeg h264 decoder */


#include "common.h"
#include "clip1.h"

#ifdef _MSC_VER
#undef HAVE_MMXEXT  /* not finished now */
#endif
#ifdef HAVE_MMXEXT
#   include "i386/predict.h"
#endif

/****************************************************************************
 * 16x16 prediction for intra luma block
 ****************************************************************************/

#define PREDICT_16x16_DC(v) \
    for( i = 0; i < 16; i++ )\
    {\
        uint32_t *p = (uint32_t*)src;\
        *p++ = v;\
        *p++ = v;\
        *p++ = v;\
        *p++ = v;\
        src += FDEC_STRIDE;\
    }

static void predict_16x16_dc( uint8_t *src )
{
    uint32_t dc = 0;
    int i;

    for( i = 0; i < 16; i++ )
    {
        dc += src[-1 + i * FDEC_STRIDE];
        dc += src[i - FDEC_STRIDE];
    }
    dc = (( dc + 16 ) >> 5) * 0x01010101;

    PREDICT_16x16_DC(dc);
}
static void predict_16x16_dc_left( uint8_t *src )
{
    uint32_t dc = 0;
    int i;

    for( i = 0; i < 16; i++ )
    {
        dc += src[-1 + i * FDEC_STRIDE];
    }
    dc = (( dc + 8 ) >> 4) * 0x01010101;

    PREDICT_16x16_DC(dc);
}
static void predict_16x16_dc_top( uint8_t *src )
{
    uint32_t dc = 0;
    int i;

    for( i = 0; i < 16; i++ )
    {
        dc += src[i - FDEC_STRIDE];
    }
    dc = (( dc + 8 ) >> 4) * 0x01010101;

    PREDICT_16x16_DC(dc);
}
static void predict_16x16_dc_128( uint8_t *src )
{
    int i;
    PREDICT_16x16_DC(0x80808080);
}
static void predict_16x16_h( uint8_t *src )
{
    int i;

    for( i = 0; i < 16; i++ )
    {
        const uint32_t v = 0x01010101 * src[-1];
        uint32_t *p = (uint32_t*)src;

        *p++ = v;
        *p++ = v;
        *p++ = v;
        *p++ = v;

        src += FDEC_STRIDE;

    }
}
static void predict_16x16_v( uint8_t *src )
{
    uint32_t v0 = *(uint32_t*)&src[ 0-FDEC_STRIDE];
    uint32_t v1 = *(uint32_t*)&src[ 4-FDEC_STRIDE];
    uint32_t v2 = *(uint32_t*)&src[ 8-FDEC_STRIDE];
    uint32_t v3 = *(uint32_t*)&src[12-FDEC_STRIDE];
    int i;

    for( i = 0; i < 16; i++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = v0;
        *p++ = v1;
        *p++ = v2;
        *p++ = v3;
        src += FDEC_STRIDE;
    }
}
static void predict_16x16_p( uint8_t *src )
{
    int x, y, i;
    int a, b, c;
    int H = 0;
    int V = 0;
    int i00;

    /* calcule H and V */
    for( i = 0; i <= 7; i++ )
    {
        H += ( i + 1 ) * ( src[ 8 + i - FDEC_STRIDE ] - src[6 -i -FDEC_STRIDE] );
        V += ( i + 1 ) * ( src[-1 + (8+i)*FDEC_STRIDE] - src[-1 + (6-i)*FDEC_STRIDE] );
    }

    a = 16 * ( src[-1 + 15*FDEC_STRIDE] + src[15 - FDEC_STRIDE] );
    b = ( 5 * H + 32 ) >> 6;
    c = ( 5 * V + 32 ) >> 6;

    i00 = a - b * 7 - c * 7 + 16;

    for( y = 0; y < 16; y++ )
    {
        int pix = i00;
        for( x = 0; x < 16; x++ )
        {
            src[x] = x264_clip_uint8( pix>>5 );
            pix += b;
        }
        src += FDEC_STRIDE;
        i00 += c;
    }
}


/****************************************************************************
 * 8x8 prediction for intra chroma block
 ****************************************************************************/

static void predict_8x8c_dc_128( uint8_t *src )
{
    int y;

    for( y = 0; y < 8; y++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = 0x80808080;
        *p++ = 0x80808080;
        src += FDEC_STRIDE;
    }
}
static void predict_8x8c_dc_left( uint8_t *src )
{
    int y;
    uint32_t dc0 = 0, dc1 = 0;

    for( y = 0; y < 4; y++ )
    {
        dc0 += src[y * FDEC_STRIDE     - 1];
        dc1 += src[(y+4) * FDEC_STRIDE - 1];
    }
    dc0 = (( dc0 + 2 ) >> 2)*0x01010101;
    dc1 = (( dc1 + 2 ) >> 2)*0x01010101;

    for( y = 0; y < 4; y++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = dc0;
        *p++ = dc0;
        src += FDEC_STRIDE;
    }
    for( y = 0; y < 4; y++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = dc1;
        *p++ = dc1;
        src += FDEC_STRIDE;
    }

}
static void predict_8x8c_dc_top( uint8_t *src )
{
    int y, x;
    uint32_t dc0 = 0, dc1 = 0;

    for( x = 0; x < 4; x++ )
    {
        dc0 += src[x     - FDEC_STRIDE];
        dc1 += src[x + 4 - FDEC_STRIDE];
    }
    dc0 = (( dc0 + 2 ) >> 2)*0x01010101;
    dc1 = (( dc1 + 2 ) >> 2)*0x01010101;

    for( y = 0; y < 8; y++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = dc0;
        *p++ = dc1;
        src += FDEC_STRIDE;
    }
}
static void predict_8x8c_dc( uint8_t *src )
{
    int y;
    int s0 = 0, s1 = 0, s2 = 0, s3 = 0;
    uint32_t dc0, dc1, dc2, dc3;
    int i;

    /*
          s0 s1
       s2
       s3
    */
    for( i = 0; i < 4; i++ )
    {
        s0 += src[i - FDEC_STRIDE];
        s1 += src[i + 4 - FDEC_STRIDE];
        s2 += src[-1 + i * FDEC_STRIDE];
        s3 += src[-1 + (i+4)*FDEC_STRIDE];
    }
    /*
       dc0 dc1
       dc2 dc3
     */
    dc0 = (( s0 + s2 + 4 ) >> 3)*0x01010101;
    dc1 = (( s1 + 2 ) >> 2)*0x01010101;
    dc2 = (( s3 + 2 ) >> 2)*0x01010101;
    dc3 = (( s1 + s3 + 4 ) >> 3)*0x01010101;

    for( y = 0; y < 4; y++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = dc0;
        *p++ = dc1;
        src += FDEC_STRIDE;
    }

    for( y = 0; y < 4; y++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = dc2;
        *p++ = dc3;
        src += FDEC_STRIDE;
    }
}
static void predict_8x8c_h( uint8_t *src )
{
    int i;

    for( i = 0; i < 8; i++ )
    {
        uint32_t v = 0x01010101 * src[-1];
        uint32_t *p = (uint32_t*)src;
        *p++ = v;
        *p++ = v;
        src += FDEC_STRIDE;
    }
}
static void predict_8x8c_v( uint8_t *src )
{
    uint32_t v0 = *(uint32_t*)&src[0-FDEC_STRIDE];
    uint32_t v1 = *(uint32_t*)&src[4-FDEC_STRIDE];
    int i;

    for( i = 0; i < 8; i++ )
    {
        uint32_t *p = (uint32_t*)src;
        *p++ = v0;
        *p++ = v1;
        src += FDEC_STRIDE;
    }
}
static void predict_8x8c_p( uint8_t *src )
{
    int i;
    int x,y;
    int a, b, c;
    int H = 0;
    int V = 0;
    int i00;

    for( i = 0; i < 4; i++ )
    {
        H += ( i + 1 ) * ( src[4+i - FDEC_STRIDE] - src[2 - i -FDEC_STRIDE] );
        V += ( i + 1 ) * ( src[-1 +(i+4)*FDEC_STRIDE] - src[-1+(2-i)*FDEC_STRIDE] );
    }

    a = 16 * ( src[-1+7*FDEC_STRIDE] + src[7 - FDEC_STRIDE] );
    b = ( 17 * H + 16 ) >> 5;
    c = ( 17 * V + 16 ) >> 5;
    i00 = a -3*b -3*c + 16;

    for( y = 0; y < 8; y++ )
    {
        int pix = i00;
        for( x = 0; x < 8; x++ )
        {
            src[x] = x264_clip_uint8( pix>>5 );
            pix += b;
        }
        src += FDEC_STRIDE;
        i00 += c;
    }
}

/****************************************************************************
 * 4x4 prediction for intra luma block
 ****************************************************************************/

#define PREDICT_4x4_DC(v) \
{\
    *(uint32_t*)&src[0*FDEC_STRIDE] =\
    *(uint32_t*)&src[1*FDEC_STRIDE] =\
    *(uint32_t*)&src[2*FDEC_STRIDE] =\
    *(uint32_t*)&src[3*FDEC_STRIDE] = v;\
}

static void predict_4x4_dc_128( uint8_t *src )
{
    PREDICT_4x4_DC(0x80808080);
}
static void predict_4x4_dc_left( uint8_t *src )
{
    uint32_t dc = (( src[-1+0*FDEC_STRIDE] + src[-1+FDEC_STRIDE]+
                     src[-1+2*FDEC_STRIDE] + src[-1+3*FDEC_STRIDE] + 2 ) >> 2)*0x01010101;
    PREDICT_4x4_DC(dc);
}
static void predict_4x4_dc_top( uint8_t *src )
{
    uint32_t dc = (( src[0 - FDEC_STRIDE] + src[1 - FDEC_STRIDE] +
                     src[2 - FDEC_STRIDE] + src[3 - FDEC_STRIDE] + 2 ) >> 2)*0x01010101;
    PREDICT_4x4_DC(dc);
}
static void predict_4x4_dc( uint8_t *src )
{
    uint32_t dc = (( src[-1+0*FDEC_STRIDE] + src[-1+FDEC_STRIDE] +
                     src[-1+2*FDEC_STRIDE] + src[-1+3*FDEC_STRIDE] +
                     src[0 - FDEC_STRIDE]  + src[1 - FDEC_STRIDE] +
                     src[2 - FDEC_STRIDE]  + src[3 - FDEC_STRIDE] + 4 ) >> 3)*0x01010101;
    PREDICT_4x4_DC(dc);
}
static void predict_4x4_h( uint8_t *src )
{
    *(uint32_t*)&src[0*FDEC_STRIDE] = src[0*FDEC_STRIDE-1] * 0x01010101;
    *(uint32_t*)&src[1*FDEC_STRIDE] = src[1*FDEC_STRIDE-1] * 0x01010101;
    *(uint32_t*)&src[2*FDEC_STRIDE] = src[2*FDEC_STRIDE-1] * 0x01010101;
    *(uint32_t*)&src[3*FDEC_STRIDE] = src[3*FDEC_STRIDE-1] * 0x01010101;
}
static void predict_4x4_v( uint8_t *src )
{
    uint32_t top = *((uint32_t*)&src[-FDEC_STRIDE]);
    PREDICT_4x4_DC(top);
}

#define PREDICT_4x4_LOAD_LEFT \
    const int l0 = src[-1+0*FDEC_STRIDE];   \
    const int l1 = src[-1+1*FDEC_STRIDE];   \
    const int l2 = src[-1+2*FDEC_STRIDE];   \
    UNUSED const int l3 = src[-1+3*FDEC_STRIDE];

#define PREDICT_4x4_LOAD_TOP \
    const int t0 = src[0-1*FDEC_STRIDE];   \
    const int t1 = src[1-1*FDEC_STRIDE];   \
    const int t2 = src[2-1*FDEC_STRIDE];   \
    UNUSED const int t3 = src[3-1*FDEC_STRIDE];

#define PREDICT_4x4_LOAD_TOP_RIGHT \
    const int t4 = src[4-1*FDEC_STRIDE];   \
    const int t5 = src[5-1*FDEC_STRIDE];   \
    const int t6 = src[6-1*FDEC_STRIDE];   \
    UNUSED const int t7 = src[7-1*FDEC_STRIDE];

static void predict_4x4_ddl( uint8_t *src )
{
    PREDICT_4x4_LOAD_TOP
    PREDICT_4x4_LOAD_TOP_RIGHT

    src[0*FDEC_STRIDE+0] = ( t0 + 2*t1 + t2 + 2 ) >> 2;

    src[0*FDEC_STRIDE+1] =
    src[1*FDEC_STRIDE+0] = ( t1 + 2*t2 + t3 + 2 ) >> 2;

    src[0*FDEC_STRIDE+2] =
    src[1*FDEC_STRIDE+1] =
    src[2*FDEC_STRIDE+0] = ( t2 + 2*t3 + t4 + 2 ) >> 2;

    src[0*FDEC_STRIDE+3] =
    src[1*FDEC_STRIDE+2] =
    src[2*FDEC_STRIDE+1] =
    src[3*FDEC_STRIDE+0] = ( t3 + 2*t4 + t5 + 2 ) >> 2;

    src[1*FDEC_STRIDE+3] =
    src[2*FDEC_STRIDE+2] =
    src[3*FDEC_STRIDE+1] = ( t4 + 2*t5 + t6 + 2 ) >> 2;

    src[2*FDEC_STRIDE+3] =
    src[3*FDEC_STRIDE+2] = ( t5 + 2*t6 + t7 + 2 ) >> 2;

    src[3*FDEC_STRIDE+3] = ( t6 + 3*t7 + 2 ) >> 2;
}
static void predict_4x4_ddr( uint8_t *src )
{
    const int lt = src[-1-FDEC_STRIDE];
    PREDICT_4x4_LOAD_LEFT
    PREDICT_4x4_LOAD_TOP

    src[0*FDEC_STRIDE+0] =
    src[1*FDEC_STRIDE+1] =
    src[2*FDEC_STRIDE+2] =
    src[3*FDEC_STRIDE+3] = ( t0 + 2 * lt + l0 + 2 ) >> 2;

    src[0*FDEC_STRIDE+1] =
    src[1*FDEC_STRIDE+2] =
    src[2*FDEC_STRIDE+3] = ( lt + 2 * t0 + t1 + 2 ) >> 2;

    src[0*FDEC_STRIDE+2] =
    src[1*FDEC_STRIDE+3] = ( t0 + 2 * t1 + t2 + 2 ) >> 2;

    src[0*FDEC_STRIDE+3] = ( t1 + 2 * t2 + t3 + 2 ) >> 2;

    src[1*FDEC_STRIDE+0] =
    src[2*FDEC_STRIDE+1] =
    src[3*FDEC_STRIDE+2] = ( lt + 2 * l0 + l1 + 2 ) >> 2;

    src[2*FDEC_STRIDE+0] =
    src[3*FDEC_STRIDE+1] = ( l0 + 2 * l1 + l2 + 2 ) >> 2;

    src[3*FDEC_STRIDE+0] = ( l1 + 2 * l2 + l3 + 2 ) >> 2;
}