quant.c
资源名称:chapter15.rar [点击查看]
上传用户:hjq518
上传日期:2021-12-09
资源大小:5084k
文件大小:8k
源码类别:
Audio
开发平台:
Visual C++
- /*****************************************************************************
- * 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 */
- }