1 /*
2 * JPEG-LS common code
3 * Copyright (c) 2003 Michael Niedermayer
4 * Copyright (c) 2006 Konstantin Shishkov
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * JPEG-LS common code.
26 */
27
28 #include <stddef.h>
32
34 {
36
39
40 // QBPP = ceil(log2(RANGE))
42 ;
43
46
47 for (
i = 0;
i < 367;
i++) {
50 }
51 }
52
53 /**
54 * Custom value clipping function used in T1, T2, T3 calculation
55 */
56 static inline int iso_clip(
int v,
int vmin,
int vmax)
57 {
58 if (v > vmax || v < vmin)
59 return vmin;
60 else
61 return v;
62 }
63
65 {
66 const int basic_t1 = 3;
67 const int basic_t2 = 7;
68 const int basic_t3 = 21;
70
71 if (
s->maxval == 0 || reset_all)
72 s->maxval = (1 <<
s->bpp) - 1;
73
74 if (
s->maxval >= 128) {
76
77 if (
s->T1 == 0 || reset_all)
79 s->near + 1,
s->maxval);
80 if (
s->T2 == 0 || reset_all)
83 if (
s->T3 == 0 || reset_all)
86 } else {
88
89 if (
s->T1 == 0 || reset_all)
91 s->near + 1,
s->maxval);
92 if (
s->T2 == 0 || reset_all)
95 if (
s->T3 == 0 || reset_all)
98 }
99
100 if (
s->reset == 0 || reset_all)
102 ff_dlog(
NULL,
"[JPEG-LS RESET] T=%i,%i,%i\n",
s->T1,
s->T2,
s->T3);
103 }