e8f7c627fb70ac587eea966ce60af538b90aa99a
[libav.git] / libavcodec / hqx.h
1 /*
2 * Canopus HQX decoder
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_HQX_H
22 #define AVCODEC_HQX_H
23
24 #include <stdint.h>
25
26 #include "libavutil/frame.h"
27 #include "libavutil/mem.h"
28
29 #include "bitstream.h"
30 #include "hqxdsp.h"
31
32 enum HQXACMode {
33 HQX_AC_Q0 = 0,
34 HQX_AC_Q8,
35 HQX_AC_Q16,
36 HQX_AC_Q32,
37 HQX_AC_Q64,
38 HQX_AC_Q128,
39 NUM_HQX_AC
40 };
41
42 typedef struct HQXLUT {
43 int16_t lev;
44 uint8_t run;
45 int8_t bits;
46 } HQXLUT;
47
48 typedef struct HQXAC {
49 int lut_bits, extra_bits;
50 const HQXLUT *lut;
51 } HQXAC;
52
53 struct HQXContext;
54
55 typedef int (*mb_decode_func)(struct HQXContext *ctx,
56 int slice_no, int x, int y);
57
58 typedef struct HQXSlice {
59 BitstreamContext bc;
60 DECLARE_ALIGNED(16, int16_t, block)[16][64];
61 } HQXSlice;
62
63 typedef struct HQXContext {
64 HQXDSPContext hqxdsp;
65 HQXSlice slice[16];
66
67 AVFrame *pic;
68 mb_decode_func decode_func;
69
70 int format, dcb, width, height;
71 int interlaced;
72
73 uint8_t *src;
74 unsigned int data_size;
75 uint32_t slice_off[17];
76
77 VLC cbp_vlc;
78 VLC dc_vlc[3];
79 } HQXContext;
80
81 #define HQX_DC_VLC_BITS 9
82
83 extern const HQXAC ff_hqx_ac[NUM_HQX_AC];
84
85 int ff_hqx_init_vlcs(HQXContext *ctx);
86
87 #endif /* AVCODEC_HQX_H */