1 /*****************************************************************************
2 * clip1.h: h264 encoder library
3 *****************************************************************************
4 * Copyright (C) 2003 Laurent Aimar
5 * $Id: clip1.h,v 1.1 2004/06/03 19:27:06 fenrir Exp $
7 * Authors: Laurent Aimar <fenrir@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 *****************************************************************************/
28 * XXX : only for tap filter.
30 * With tap filter (( 1, -5, 20, 20, -5, 1 ) + 16 )/ 32
31 * -> (-2*5 * 255+16)/32 <= out <= (2*1*255 + 2*20*255+16)/32
32 * -> -80 <= out <= 335
33 * So we need a table of 80+335+1 = 416 entries
36 static const uint8_t x264_mc_clip1_table[80+1+335] =
39 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
40 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
43 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17,
44 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
45 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
46 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71,
47 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
48 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100,101,102,103,104,105,106,107,
49 108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,
50 126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
51 144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,
52 162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,
53 180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,
54 198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,
55 216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,
56 234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,
59 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
60 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
61 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
62 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
63 255,255,255,255,255,255,255,255,
66 static inline uint8_t x264_mc_clip1( int x )
68 return x264_mc_clip1_table[x+80];
71 static inline uint8_t x264_clip_uint8( int x )
73 return x&(~255) ? (-x)>>31 : x;