xref: /third_party/ffmpeg/libavcodec/hqx.h (revision cabdff1a) 
1/*
2 * Canopus HQX decoder
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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_internal.h"
28
29#include "get_bits.h"
30#include "hqxdsp.h"
31
32enum 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
42typedef struct HQXLUT {
43    int16_t lev;
44    uint8_t run;
45    int8_t  bits;
46} HQXLUT;
47
48typedef struct HQXAC {
49    int lut_bits, extra_bits;
50    const HQXLUT *lut;
51} HQXAC;
52
53struct HQXContext;
54
55typedef int (*mb_decode_func)(struct HQXContext *ctx,
56                              int slice_no, int x, int y);
57
58typedef struct HQXSlice {
59    GetBitContext gb;
60    DECLARE_ALIGNED(16, int16_t, block)[16][64];
61} HQXSlice;
62
63typedef 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    const 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_CBP_VLC_BITS 5
82#define HQX_DC_VLC_BITS 9
83
84extern const HQXAC ff_hqx_ac[NUM_HQX_AC];
85
86int ff_hqx_init_vlcs(HQXContext *ctx);
87
88#endif /* AVCODEC_HQX_H */
89