/***************************************************************************** * quant.c: h264 encoder library ***************************************************************************** * Copyright (C) 2005 x264 project * * Authors: Christian Heine <sennindemokrit@gmx.net> * * 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. *****************************************************************************/#include "common.h"#ifdef HAVE_MMXEXT#include "i386/quant.h"#endif#define QUANT_ONE( coef, mf ) \{ \    if( (coef) > 0 ) \        (coef) = ( f + (coef) * (mf) ) >> i_qbits; \    else \        (coef) = - ( ( f - (coef) * (mf) ) >> i_qbits ); \}static void quant_8x8_core( int16_t dct[8][8], int quant_mf[8][8], int i_qbits, int f ){    int i;    for( i = 0; i < 64; i++ )        QUANT_ONE( dct[0][i], quant_mf[0][i] );}static void quant_4x4_core( int16_t dct[4][4], int quant_mf[4][4], int i_qbits, int f ){    int i;    for( i = 0; i < 16; i++ )        QUANT_ONE( dct[0][i], quant_mf[0][i] );}static void quant_4x4_dc_core( int16_t dct[4][4], int i_quant_mf, int i_qbits, int f ){    int i;    for( i = 0; i < 16; i++ )        QUANT_ONE( dct[0][i], i_quant_mf );}static void quant_2x2_dc_core( int16_t dct[2][2], int i_quant_mf, int i_qbits, int f ){    QUANT_ONE( dct[0][0], i_quant_mf );    QUANT_ONE( dct[0][1], i_quant_mf );    QUANT_ONE( dct[0][2], i_quant_mf );    QUANT_ONE( dct[0][3], i_quant_mf );}#define DEQUANT_SHL( x ) \    dct[y][x] = ( dct[y][x] * dequant_mf[i_mf][y][x] ) << i_qbits#define DEQUANT_SHR( x ) \    dct[y][x] = ( dct[y][x] * dequant_mf[i_mf][y][x] + f ) >> (-i_qbits)static void dequant_4x4( int16_t dct[4][4], int dequant_mf[6][4][4], int i_qp ){    const int i_mf = i_qp%6;    const int i_qbits = i_qp/6 - 4;    int y;    if( i_qbits >= 0 )    {        for( y = 0; y < 4; y++ )        {            DEQUANT_SHL( 0 );            DEQUANT_SHL( 1 );            DEQUANT_SHL( 2 );            DEQUANT_SHL( 3 );        }    }    else    {        const int f = 1 << (-i_qbits-1);        for( y = 0; y < 4; y++ )        {            DEQUANT_SHR( 0 );            DEQUANT_SHR( 1 );            DEQUANT_SHR( 2 );            DEQUANT_SHR( 3 );        }    }}static void dequant_8x8( int16_t dct[8][8], int dequant_mf[6][8][8], int i_qp ){    const int i_mf = i_qp%6;    const int i_qbits = i_qp/6 - 6;    int y;    if( i_qbits >= 0 )    {        for( y = 0; y < 8; y++ )        {            DEQUANT_SHL( 0 );            DEQUANT_SHL( 1 );            DEQUANT_SHL( 2 );            DEQUANT_SHL( 3 );            DEQUANT_SHL( 4 );            DEQUANT_SHL( 5 );            DEQUANT_SHL( 6 );            DEQUANT_SHL( 7 );        }    }    else    {        const int f = 1 << (-i_qbits-1);        for( y = 0; y < 8; y++ )        {            DEQUANT_SHR( 0 );            DEQUANT_SHR( 1 );            DEQUANT_SHR( 2 );            DEQUANT_SHR( 3 );            DEQUANT_SHR( 4 );            DEQUANT_SHR( 5 );            DEQUANT_SHR( 6 );            DEQUANT_SHR( 7 );        }    }}void x264_mb_dequant_2x2_dc( int16_t dct[2][2], int dequant_mf[6][4][4], int i_qp ){    const int i_qbits = i_qp/6 - 5;    if( i_qbits >= 0 )    {        const int i_dmf = dequant_mf[i_qp%6][0][0] << i_qbits;        dct[0][0] *= i_dmf;        dct[0][1] *= i_dmf;        dct[1][0] *= i_dmf;        dct[1][1] *= i_dmf;    }    else    {        const int i_dmf = dequant_mf[i_qp%6][0][0];        // chroma DC is truncated, not rounded        dct[0][0] = ( dct[0][0] * i_dmf ) >> (-i_qbits);        dct[0][1] = ( dct[0][1] * i_dmf ) >> (-i_qbits);        dct[1][0] = ( dct[1][0] * i_dmf ) >> (-i_qbits);        dct[1][1] = ( dct[1][1] * i_dmf ) >> (-i_qbits);    }}void x264_mb_dequant_4x4_dc( int16_t dct[4][4], int dequant_mf[6][4][4], int i_qp ){    const int i_qbits = i_qp/6 - 6;    int y;    if( i_qbits >= 0 )    {        const int i_dmf = dequant_mf[i_qp%6][0][0] << i_qbits;        for( y = 0; y < 4; y++ )        {            dct[y][0] *= i_dmf;            dct[y][1] *= i_dmf;            dct[y][2] *= i_dmf;            dct[y][3] *= i_dmf;        }    }    else    {        const int i_dmf = dequant_mf[i_qp%6][0][0];        const int f = 1 << (-i_qbits-1);        for( y = 0; y < 4; y++ )        {            dct[y][0] = ( dct[y][0] * i_dmf + f ) >> (-i_qbits);            dct[y][1] = ( dct[y][1] * i_dmf + f ) >> (-i_qbits);            dct[y][2] = ( dct[y][2] * i_dmf + f ) >> (-i_qbits);            dct[y][3] = ( dct[y][3] * i_dmf + f ) >> (-i_qbits);        }    }}void x264_quant_init( x264_t *h, int cpu, x264_quant_function_t *pf ){    int i, maxQ8=0, maxQ4=0, maxQdc=0;    pf->quant_8x8_core = quant_8x8_core;    pf->quant_4x4_core = quant_4x4_core;    pf->quant_4x4_dc_core = quant_4x4_dc_core;    pf->quant_2x2_dc_core = quant_2x2_dc_core;    pf->dequant_4x4 = dequant_4x4;    pf->dequant_8x8 = dequant_8x8;#ifdef HAVE_MMXEXT    /* determine the biggest coeffient in all quant8_mf tables */    for( i = 0; i < 2*6*8*8; i++ )    {        int q = h->quant8_mf[0][0][0][i];        if( maxQ8 < q )            maxQ8 = q;    }    /* determine the biggest coeffient in all quant4_mf tables ( maxQ4 )       and the biggest DC coefficient if all quant4_mf tables ( maxQdc ) */    for( i = 0; i < 4*6*4*4; i++ )    {        int q = h->quant4_mf[0][0][0][i];        if( maxQ4 < q )            maxQ4 = q;        if( maxQdc < q && i%16 == 0 )            maxQdc = q;    }    /* select quant_8x8 based on CPU and maxQ8 */    if( maxQ8 < (1<<15) && cpu&X264_CPU_MMX )        pf->quant_8x8_core = x264_quant_8x8_core15_mmx;    else    if( maxQ8 < (1<<16) && cpu&X264_CPU_MMXEXT )        pf->quant_8x8_core = x264_quant_8x8_core16_mmxext;    else    if( cpu&X264_CPU_MMXEXT )        pf->quant_8x8_core = x264_quant_8x8_core32_mmxext;    /* select quant_4x4 based on CPU and maxQ4 */    if( maxQ4 < (1<<15) && cpu&X264_CPU_MMX )        pf->quant_4x4_core = x264_quant_4x4_core15_mmx;    else    if( maxQ4 < (1<<16) && cpu&X264_CPU_MMXEXT )        pf->quant_4x4_core = x264_quant_4x4_core16_mmxext;    else    if( cpu&X264_CPU_MMXEXT )        pf->quant_4x4_core = x264_quant_4x4_core32_mmxext;    /* select quant_XxX_dc based on CPU and maxQdc */    if( maxQdc < (1<<16) && cpu&X264_CPU_MMXEXT )    {        pf->quant_4x4_dc_core = x264_quant_4x4_dc_core16_mmxext;        pf->quant_2x2_dc_core = x264_quant_2x2_dc_core16_mmxext;    }    else    if( maxQdc < (1<<15) && cpu&X264_CPU_MMX )    {        pf->quant_4x4_dc_core = x264_quant_4x4_dc_core15_mmx;        pf->quant_2x2_dc_core = x264_quant_2x2_dc_core15_mmx;    }    else    if( cpu&X264_CPU_MMXEXT )    {        pf->quant_4x4_dc_core = x264_quant_4x4_dc_core32_mmxext;        pf->quant_2x2_dc_core = x264_quant_2x2_dc_core32_mmxext;    }    if( cpu&X264_CPU_MMX )    {        /* dequant is not subject to the above CQM-dependent overflow issues,         * as long as the inputs are in the range generable by dct+quant.         * that is not guaranteed by the standard, but is true within x264 */        pf->dequant_4x4 = x264_dequant_4x4_mmx;        pf->dequant_8x8 = x264_dequant_8x8_mmx;    }#endif  /* HAVE_MMXEXT */}