1 /*****************************************************************************
2 * vdec_idct.c : common IDCT functions
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
5 * $Id: vdec_idct.c,v 1.2 2001/07/17 09:48:07 massiot Exp $
7 * Authors: Gaƫl Hendryckx <jimmy@via.ecp.fr>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /* MODULE_NAME defined in Makefile together with -DBUILTIN */
26 # include "modules_inner.h"
28 # define _M( foo ) foo
31 /*****************************************************************************
33 *****************************************************************************/
36 #include <string.h> /* memcpy(), memset() */
44 #include "video_output.h"
48 #include "vdec_ext-plugins.h"
49 #include "vdec_idct.h"
51 /*****************************************************************************
52 * vdec_InitIDCT : initialize datas for vdec_SparseIDCT
53 *****************************************************************************/
54 void _M( vdec_InitIDCT ) ( vdec_thread_t * p_vdec )
59 p_vdec->p_idct_data = malloc( sizeof(dctelem_t) * 64 * 64 );
60 p_pre = (dctelem_t *) p_vdec->p_idct_data;
61 memset( p_pre, 0, 64 * 64 * sizeof(dctelem_t) );
63 for( i=0 ; i < 64 ; i++ )
65 p_pre[i*64+i] = 1 << SPARSE_SCALE_FACTOR;
66 _M( vdec_IDCT )( p_vdec, &p_pre[i*64], 0) ;
71 /*****************************************************************************
72 * vdec_SparseIDCT : IDCT function for sparse matrices
73 *****************************************************************************/
74 void _M( vdec_SparseIDCT ) ( void * p_idct_data,
75 dctelem_t * p_block, int i_sparse_pos )
83 dctelem_t * p_pre = (dctelem_t *) p_idct_data;
85 /* If DC Coefficient. */
86 if ( i_sparse_pos == 0 )
89 val=RIGHT_SHIFT((*p_block + 4), 3);
90 /* Compute int to assign. This speeds things up a bit */
91 v = ((val & 0xffff) | (val << 16));
92 dp[0] = v; dp[1] = v; dp[2] = v; dp[3] = v;
93 dp[4] = v; dp[5] = v; dp[6] = v; dp[7] = v;
94 dp[8] = v; dp[9] = v; dp[10] = v; dp[11] = v;
95 dp[12] = v; dp[13] = v; dp[14] = v; dp[15] = v;
96 dp[16] = v; dp[17] = v; dp[18] = v; dp[19] = v;
97 dp[20] = v; dp[21] = v; dp[22] = v; dp[23] = v;
98 dp[24] = v; dp[25] = v; dp[26] = v; dp[27] = v;
99 dp[28] = v; dp[29] = v; dp[30] = v; dp[31] = v;
102 /* Some other coefficient. */
103 p_dest = (s16*)p_block;
104 p_source = (s16*)&p_pre[i_sparse_pos * 64];
105 coeff = (int)p_dest[i_sparse_pos];
106 for( rr=0 ; rr < 4 ; rr++ )
108 p_dest[0] = (p_source[0] * coeff) >> SPARSE_SCALE_FACTOR;
109 p_dest[1] = (p_source[1] * coeff) >> SPARSE_SCALE_FACTOR;
110 p_dest[2] = (p_source[2] * coeff) >> SPARSE_SCALE_FACTOR;
111 p_dest[3] = (p_source[3] * coeff) >> SPARSE_SCALE_FACTOR;
112 p_dest[4] = (p_source[4] * coeff) >> SPARSE_SCALE_FACTOR;
113 p_dest[5] = (p_source[5] * coeff) >> SPARSE_SCALE_FACTOR;
114 p_dest[6] = (p_source[6] * coeff) >> SPARSE_SCALE_FACTOR;
115 p_dest[7] = (p_source[7] * coeff) >> SPARSE_SCALE_FACTOR;
116 p_dest[8] = (p_source[8] * coeff) >> SPARSE_SCALE_FACTOR;
117 p_dest[9] = (p_source[9] * coeff) >> SPARSE_SCALE_FACTOR;
118 p_dest[10] = (p_source[10] * coeff) >> SPARSE_SCALE_FACTOR;
119 p_dest[11] = (p_source[11] * coeff) >> SPARSE_SCALE_FACTOR;
120 p_dest[12] = (p_source[12] * coeff) >> SPARSE_SCALE_FACTOR;
121 p_dest[13] = (p_source[13] * coeff) >> SPARSE_SCALE_FACTOR;
122 p_dest[14] = (p_source[14] * coeff) >> SPARSE_SCALE_FACTOR;
123 p_dest[15] = (p_source[15] * coeff) >> SPARSE_SCALE_FACTOR;