/***************************************************************************** * dct.c: h264 encoder library ***************************************************************************** * Copyright (C) 2003 Laurent Aimar * $Id: dct.c,v 1.1 2004/06/03 19:27:06 fenrir Exp $ * * Authors: Laurent Aimar * * 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. *****************************************************************************/ #ifdef HAVE_STDINT_H #include #else #include #endif #include #include #include "x264.h" #include "dct.h" #ifdef HAVE_MMXEXT # include "i386/dct.h" #endif static inline int clip_uint8( int a ) { if (a&(~255)) return (-a)>>31; else return a; } /* * XXX For all dct dc : input could be equal to output so ... */ static void dct2x2dc( int16_t d[2][2] ) { int tmp[2][2]; tmp[0][0] = d[0][0] + d[0][1]; tmp[1][0] = d[0][0] - d[0][1]; tmp[0][1] = d[1][0] + d[1][1]; tmp[1][1] = d[1][0] - d[1][1]; d[0][0] = tmp[0][0] + tmp[0][1]; d[0][1] = tmp[1][0] + tmp[1][1]; d[1][0] = tmp[0][0] - tmp[0][1]; d[1][1] = tmp[1][0] - tmp[1][1]; } static void dct4x4dc( int16_t d[4][4] ) { int16_t tmp[4][4]; int s01, s23; int d01, d23; int i; for( i = 0; i < 4; i++ ) { s01 = d[i][0] + d[i][1]; d01 = d[i][0] - d[i][1]; s23 = d[i][2] + d[i][3]; d23 = d[i][2] - d[i][3]; tmp[0][i] = s01 + s23; tmp[1][i] = s01 - s23; tmp[2][i] = d01 - d23; tmp[3][i] = d01 + d23; } for( i = 0; i < 4; i++ ) { s01 = tmp[i][0] + tmp[i][1]; d01 = tmp[i][0] - tmp[i][1]; s23 = tmp[i][2] + tmp[i][3]; d23 = tmp[i][2] - tmp[i][3]; d[0][i] = ( s01 + s23 + 1 ) >> 1; d[1][i] = ( s01 - s23 + 1 ) >> 1; d[2][i] = ( d01 - d23 + 1 ) >> 1; d[3][i] = ( d01 + d23 + 1 ) >> 1; } } static void idct4x4dc( int16_t d[4][4] ) { int16_t tmp[4][4]; int s01, s23; int d01, d23; int i; for( i = 0; i < 4; i++ ) { s01 = d[0][i] + d[1][i]; d01 = d[0][i] - d[1][i]; s23 = d[2][i] + d[3][i]; d23 = d[2][i] - d[3][i]; tmp[0][i] = s01 + s23; tmp[1][i] = s01 - s23; tmp[2][i] = d01 - d23; tmp[3][i] = d01 + d23; } for( i = 0; i < 4; i++ ) { s01 = tmp[i][0] + tmp[i][1]; d01 = tmp[i][0] - tmp[i][1]; s23 = tmp[i][2] + tmp[i][3]; d23 = tmp[i][2] - tmp[i][3]; d[i][0] = s01 + s23; d[i][1] = s01 - s23; d[i][2] = d01 - d23; d[i][3] = d01 + d23; } } static void sub4x4_dct( int16_t dct[4][4], uint8_t *pix1, int i_pix1, uint8_t *pix2, int i_pix2 ) { int16_t d[4][4]; int16_t tmp[4][4]; int y, x; int i; for( y = 0; y < 4; y++ ) { for( x = 0; x < 4; x++ ) { d[y][x] = pix1[x] - pix2[x]; } pix1 += i_pix1; pix2 += i_pix2; } for( i = 0; i < 4; i++ ) { const int s03 = d[i][0] + d[i][3]; const int s12 = d[i][1] + d[i][2]; const int d03 = d[i][0] - d[i][3]; const int d12 = d[i][1] - d[i][2]; tmp[0][i] = s03 + s12; tmp[1][i] = 2*d03 + d12; tmp[2][i] = s03 - s12; tmp[3][i] = d03 - 2*d12; } for( i = 0; i < 4; i++ ) { const int s03 = tmp[i][0] + tmp[i][3]; const int s12 = tmp[i][1] + tmp[i][2]; const int d03 = tmp[i][0] - tmp[i][3]; const int d12 = tmp[i][1] - tmp[i][2]; dct[0][i] = s03 + s12; dct[1][i] = 2*d03 + d12; dct[2][i] = s03 - s12; dct[3][i] = d03 - 2*d12; } } static void sub8x8_dct( int16_t dct[4][4][4], uint8_t *pix1, int i_pix1, uint8_t *pix2, int i_pix2 ) { sub4x4_dct( dct[0], &pix1[0], i_pix1, &pix2[0], i_pix2 ); sub4x4_dct( dct[1], &pix1[4], i_pix1, &pix2[4], i_pix2 ); sub4x4_dct( dct[2], &pix1[4*i_pix1+0], i_pix1, &pix2[4*i_pix2+0], i_pix2 ); sub4x4_dct( dct[3], &pix1[4*i_pix1+4], i_pix1, &pix2[4*i_pix2+4], i_pix2 ); } static void sub16x16_dct( int16_t dct[16][4][4], uint8_t *pix1, int i_pix1, uint8_t *pix2, int i_pix2 ) { sub8x8_dct( &dct[ 0], pix1, i_pix1, pix2, i_pix2 ); sub8x8_dct( &dct[ 4], &pix1[8], i_pix1, &pix2[8], i_pix2 ); sub8x8_dct( &dct[ 8], &pix1[8*i_pix1], i_pix1, &pix2[8*i_pix2], i_pix2 ); sub8x8_dct( &dct[12], &pix1[8*i_pix1+8], i_pix1, &pix2[8*i_pix2+8], i_pix2 ); } static void add4x4_idct( uint8_t *p_dst, int i_dst, int16_t dct[4][4] ) { int16_t d[4][4]; int16_t tmp[4][4]; int x, y; int i; for( i = 0; i < 4; i++ ) { const int s02 = dct[i][0] + dct[i][2]; const int d02 = dct[i][0] - dct[i][2]; const int s13 = dct[i][1] + (dct[i][3]>>1); const int d13 = (dct[i][1]>>1) - dct[i][3]; tmp[i][0] = s02 + s13; tmp[i][1] = d02 + d13; tmp[i][2] = d02 - d13; tmp[i][3] = s02 - s13; } for( i = 0; i < 4; i++ ) { const int s02 = tmp[0][i] + tmp[2][i]; const int d02 = tmp[0][i] - tmp[2][i]; const int s13 = tmp[1][i] + (tmp[3][i]>>1); const int d13 = (tmp[1][i]>>1) - tmp[3][i]; d[0][i] = ( s02 + s13 + 32 ) >> 6; d[1][i] = ( d02 + d13 + 32 ) >> 6; d[2][i] = ( d02 - d13 + 32 ) >> 6; d[3][i] = ( s02 - s13 + 32 ) >> 6; } for( y = 0; y < 4; y++ ) { for( x = 0; x < 4; x++ ) { p_dst[x] = clip_uint8( p_dst[x] + d[y][x] ); } p_dst += i_dst; } } static void add8x8_idct( uint8_t *p_dst, int i_dst, int16_t dct[4][4][4] ) { add4x4_idct( p_dst, i_dst, dct[0] ); add4x4_idct( &p_dst[4], i_dst, dct[1] ); add4x4_idct( &p_dst[4*i_dst+0], i_dst, dct[2] ); add4x4_idct( &p_dst[4*i_dst+4], i_dst, dct[3] ); } static void add16x16_idct( uint8_t *p_dst, int i_dst, int16_t dct[16][4][4] ) { add8x8_idct( &p_dst[0], i_dst, &dct[0] ); add8x8_idct( &p_dst[8], i_dst, &dct[4] ); add8x8_idct( &p_dst[8*i_dst], i_dst, &dct[8] ); add8x8_idct( &p_dst[8*i_dst+8], i_dst, &dct[12] ); } /**************************************************************************** * x264_dct_init: ****************************************************************************/ void x264_dct_init( int cpu, x264_dct_function_t *dctf ) { dctf->sub4x4_dct = sub4x4_dct; dctf->add4x4_idct = add4x4_idct; dctf->sub8x8_dct = sub8x8_dct; dctf->add8x8_idct = add8x8_idct; dctf->sub16x16_dct = sub16x16_dct; dctf->add16x16_idct = add16x16_idct; dctf->dct4x4dc = dct4x4dc; dctf->idct4x4dc = idct4x4dc; dctf->dct2x2dc = dct2x2dc; dctf->idct2x2dc = dct2x2dc; #ifdef HAVE_MMXEXT if( cpu&X264_CPU_MMXEXT ) { dctf->sub4x4_dct = x264_sub4x4_dct_mmxext; dctf->sub8x8_dct = x264_sub8x8_dct_mmxext; dctf->sub16x16_dct = x264_sub16x16_dct_mmxext; dctf->add4x4_idct = x264_add4x4_idct_mmxext; dctf->add8x8_idct = x264_add8x8_idct_mmxext; dctf->add16x16_idct = x264_add16x16_idct_mmxext; dctf->dct4x4dc = x264_dct4x4dc_mmxext; dctf->idct4x4dc = x264_idct4x4dc_mmxext; } #endif }