quant.c
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上传日期:2021-12-09
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文件大小:8k
源码类别:
Audio
开发平台:
Visual C++
- /*****************************************************************************
- * quant.c: h264 encoder library
- *****************************************************************************
- * Copyright (C) 2005-2008 x264 project
- *
- * Authors: Loren Merritt <lorenm@u.washington.edu>
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
- *****************************************************************************/
- #include "common.h"
- #ifdef HAVE_MMX
- #include "x86/quant.h"
- #endif
- #ifdef ARCH_PPC
- # include "ppc/quant.h"
- #endif
- #define QUANT_ONE( coef, mf, f )
- {
- if( (coef) > 0 )
- (coef) = (f + (coef)) * (mf) >> 16;
- else
- (coef) = - ((f - (coef)) * (mf) >> 16);
- }
- static void quant_8x8( int16_t dct[8][8], uint16_t mf[64], uint16_t bias[64] )
- {
- int i;
- for( i = 0; i < 64; i++ )
- QUANT_ONE( dct[0][i], mf[i], bias[i] );
- }
- static void quant_4x4( int16_t dct[4][4], uint16_t mf[16], uint16_t bias[16] )
- {
- int i;
- for( i = 0; i < 16; i++ )
- QUANT_ONE( dct[0][i], mf[i], bias[i] );
- }
- static void quant_4x4_dc( int16_t dct[4][4], int mf, int bias )
- {
- int i;
- for( i = 0; i < 16; i++ )
- QUANT_ONE( dct[0][i], mf, bias );
- }
- static void quant_2x2_dc( int16_t dct[2][2], int mf, int bias )
- {
- QUANT_ONE( dct[0][0], mf, bias );
- QUANT_ONE( dct[0][1], mf, bias );
- QUANT_ONE( dct[0][2], mf, bias );
- QUANT_ONE( dct[0][3], mf, bias );
- }
- #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);
- }
- }
- }
- static void x264_denoise_dct( int16_t *dct, uint32_t *sum, uint16_t *offset, int size )
- {
- int i;
- for( i=1; i<size; i++ )
- {
- int level = dct[i];
- int sign = level>>15;
- level = (level+sign)^sign;
- sum[i] += level;
- level -= offset[i];
- dct[i] = level<0 ? 0 : (level^sign)-sign;
- }
- }
- void x264_quant_init( x264_t *h, int cpu, x264_quant_function_t *pf )
- {
- pf->quant_8x8 = quant_8x8;
- pf->quant_4x4 = quant_4x4;
- pf->quant_4x4_dc = quant_4x4_dc;
- pf->quant_2x2_dc = quant_2x2_dc;
- pf->dequant_4x4 = dequant_4x4;
- pf->dequant_8x8 = dequant_8x8;
- pf->denoise_dct = x264_denoise_dct;
- #ifdef HAVE_MMX
- if( cpu&X264_CPU_MMX )
- {
- #ifdef ARCH_X86
- pf->quant_4x4 = x264_quant_4x4_mmx;
- pf->quant_8x8 = x264_quant_8x8_mmx;
- pf->dequant_4x4 = x264_dequant_4x4_mmx;
- pf->dequant_8x8 = x264_dequant_8x8_mmx;
- if( h->param.i_cqm_preset == X264_CQM_FLAT )
- {
- pf->dequant_4x4 = x264_dequant_4x4_flat16_mmx;
- pf->dequant_8x8 = x264_dequant_8x8_flat16_mmx;
- }
- pf->denoise_dct = x264_denoise_dct_mmx;
- #endif
- }
- if( cpu&X264_CPU_MMXEXT )
- {
- pf->quant_2x2_dc = x264_quant_2x2_dc_mmxext;
- #ifdef ARCH_X86
- pf->quant_4x4_dc = x264_quant_4x4_dc_mmxext;
- #endif
- }
- if( cpu&X264_CPU_SSE2 )
- {
- pf->quant_4x4_dc = x264_quant_4x4_dc_sse2;
- pf->quant_4x4 = x264_quant_4x4_sse2;
- pf->quant_8x8 = x264_quant_8x8_sse2;
- pf->dequant_4x4 = x264_dequant_4x4_sse2;
- pf->dequant_8x8 = x264_dequant_8x8_sse2;
- if( h->param.i_cqm_preset == X264_CQM_FLAT )
- {
- pf->dequant_4x4 = x264_dequant_4x4_flat16_sse2;
- pf->dequant_8x8 = x264_dequant_8x8_flat16_sse2;
- }
- pf->denoise_dct = x264_denoise_dct_sse2;
- }
- if( cpu&X264_CPU_SSSE3 )
- {
- pf->quant_2x2_dc = x264_quant_2x2_dc_ssse3;
- pf->quant_4x4_dc = x264_quant_4x4_dc_ssse3;
- pf->quant_4x4 = x264_quant_4x4_ssse3;
- pf->quant_8x8 = x264_quant_8x8_ssse3;
- pf->denoise_dct = x264_denoise_dct_ssse3;
- }
- #endif // HAVE_MMX
- #ifdef ARCH_PPC
- if( cpu&X264_CPU_ALTIVEC ) {
- pf->quant_2x2_dc = x264_quant_2x2_dc_altivec;
- pf->quant_4x4_dc = x264_quant_4x4_dc_altivec;
- pf->quant_4x4 = x264_quant_4x4_altivec;
- pf->quant_8x8 = x264_quant_8x8_altivec;
- pf->dequant_4x4 = x264_dequant_4x4_altivec;
- pf->dequant_8x8 = x264_dequant_8x8_altivec;
- }
- #endif
- }