dct.h

X264的纯C语言的的原码

/*****************************************************************************
 * dct.h: h264 encoder library
 *****************************************************************************
 * Copyright (C) 2003 Laurent Aimar
 * $Id: dct.h,v 1.1 2004/06/03 19:27:06 fenrir Exp $
 *
 * Authors: Laurent Aimar <[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.
 *****************************************************************************/

#ifndef _DCT_H
#define _DCT_H 1

/* the inverse of the scaling factors introduced by 8x8 fdct */
#define W(i) (i==0 ? FIX8(1.0000) :\
              i==1 ? FIX8(0.8859) :\
              i==2 ? FIX8(1.6000) :\
              i==3 ? FIX8(0.9415) :\
              i==4 ? FIX8(1.2651) :\
              i==5 ? FIX8(1.1910) :0)
static const int x264_dct8_weight_tab[64] = {
    W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
    W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),

    W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
    W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1)
};
#undef W

/* inverse squared */
#define W(i) (i==0 ? FIX8(3.125) :\
              i==1 ? FIX8(1.25) :\
              i==2 ? FIX8(0.5) :0)
static const int x264_dct4_weight2_tab[16] = {
    W(0), W(1), W(0), W(1),
    W(1), W(2), W(1), W(2),
    W(0), W(1), W(0), W(1),
    W(1), W(2), W(1), W(2)
};
static const int x264_dct4_weight2_zigzag[16] = {
    W(0), W(1), W(1), W(0), W(2), W(0), W(1), W(1),
    W(1), W(1), W(2), W(0), W(2), W(1), W(1), W(2)
};
#undef W

#define W(i) (i==0 ? FIX8(1.00000) :\
              i==1 ? FIX8(0.78487) :\
              i==2 ? FIX8(2.56132) :\
              i==3 ? FIX8(0.88637) :\
              i==4 ? FIX8(1.60040) :\
              i==5 ? FIX8(1.41850) :0)
static const int x264_dct8_weight2_tab[64] = {
    W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
    W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),

    W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
    W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
    W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1)
};
static const int x264_dct8_weight2_zigzag[64] = {
    W(0), W(3), W(3), W(4), W(1), W(4), W(3), W(5),
    W(5), W(3), W(0), W(1), W(2), W(1), W(0), W(3),
    W(3), W(5), W(5), W(3), W(3), W(4), W(1), W(4),
    W(1), W(4), W(1), W(4), W(3), W(5), W(5), W(3),
    W(3), W(5), W(5), W(3), W(1), W(2), W(1), W(0),
    W(1), W(2), W(1), W(5), W(5), W(3), W(3), W(5),
    W(5), W(1), W(4), W(1), W(4), W(1), W(3), W(5),
    W(5), W(3), W(1), W(2), W(1), W(5), W(5), W(1)
};
#undef W

typedef struct
{
    // pix1  stride = FENC_STRIDE
    // pix2  stride = FDEC_STRIDE
    // p_dst stride = FDEC_STRIDE
    void (*sub4x4_dct)   ( int16_t dct[4][4], uint8_t *pix1, uint8_t *pix2 );
    void (*add4x4_idct)  ( uint8_t *p_dst, int16_t dct[4][4] );

    void (*sub8x8_dct)   ( int16_t dct[4][4][4], uint8_t *pix1, uint8_t *pix2 );
    void (*add8x8_idct)  ( uint8_t *p_dst, int16_t dct[4][4][4] );

    void (*sub16x16_dct) ( int16_t dct[16][4][4], uint8_t *pix1, uint8_t *pix2 );
    void (*add16x16_idct)( uint8_t *p_dst, int16_t dct[16][4][4] );

    void (*sub8x8_dct8)  ( int16_t dct[8][8], uint8_t *pix1, uint8_t *pix2 );
    void (*add8x8_idct8) ( uint8_t *p_dst, int16_t dct[8][8] );

    void (*sub16x16_dct8) ( int16_t dct[4][8][8], uint8_t *pix1, uint8_t *pix2 );
    void (*add16x16_idct8)( uint8_t *p_dst, int16_t dct[4][8][8] );

    void (*dct4x4dc) ( int16_t d[4][4] );
    void (*idct4x4dc)( int16_t d[4][4] );

    void (*dct2x2dc) ( int16_t d[2][2] );
    void (*idct2x2dc)( int16_t d[2][2] );

} x264_dct_function_t;

void x264_dct_init( int cpu, x264_dct_function_t *dctf );

#endif