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.h"
28 #include "get_bits.h"
29 #include "hqxdsp.h"
30 
31 enum HQXACMode {
32     HQX_AC_Q0 = 0,
33     HQX_AC_Q8,
34     HQX_AC_Q16,
35     HQX_AC_Q32,
36     HQX_AC_Q64,
37     HQX_AC_Q128,
38     NUM_HQX_AC
39 };
40 
41 typedef struct HQXLUT {
42     int16_t lev;
43     uint8_t run;
44     int8_t  bits;
45 } HQXLUT;
46 
47 typedef struct HQXAC {
48     int lut_bits, extra_bits;
49     const HQXLUT *lut;
50 } HQXAC;
51 
52 struct HQXContext;
53 
54 typedef int (*mb_decode_func)(struct HQXContext *ctx,
55                               int slice_no, int x, int y);
56 
57 typedef struct HQXSlice {
58     GetBitContext gb;
59     DECLARE_ALIGNED(16, int16_t, block)[16][64];
60 } HQXSlice;
61 
62 typedef struct HQXContext {
63     HQXDSPContext hqxdsp;
64     HQXSlice slice[16];
65 
66     AVFrame *pic;
67     mb_decode_func decode_func;
68 
69     int format, dcb, width, height;
70     int interlaced;
71 
72     uint8_t *src;
73     unsigned int data_size;
74     uint32_t slice_off[17];
75 
76     VLC cbp_vlc;
77     VLC dc_vlc[3];
78 } HQXContext;
79 
80 #define HQX_DC_VLC_BITS 9
81 
82 extern const HQXAC ff_hqx_ac[NUM_HQX_AC];
83 
84 int ff_hqx_init_vlcs(HQXContext *ctx);
85 
86 #endif /* AVCODEC_HQX_H */
87