Libav
mjpegdec.h
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1 /*
2  * MJPEG decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * This file is part of Libav.
8  *
9  * Libav is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * Libav 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 GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with Libav; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23 
29 #ifndef AVCODEC_MJPEGDEC_H
30 #define AVCODEC_MJPEGDEC_H
31 
32 #include "libavutil/log.h"
33 #include "libavutil/pixdesc.h"
34 
35 #include "avcodec.h"
36 #include "get_bits.h"
37 #include "dsputil.h"
38 #include "hpeldsp.h"
39 
40 #define MAX_COMPONENTS 4
41 
42 typedef struct MJpegDecodeContext {
43  AVClass *class;
46 
47  int start_code; /* current start code */
50 
51  int16_t quant_matrixes[4][64];
52  VLC vlcs[3][4];
53  int qscale[4];
54 
55  int org_height; /* size given at codec init */
56  int first_picture; /* true if decoding first picture */
57  int interlaced; /* true if interlaced */
58  int bottom_field; /* true if bottom field */
59  int lossless;
60  int ls;
62  int rgb;
63  int rct; /* standard rct */
64  int pegasus_rct; /* pegasus reversible colorspace transform */
65  int bits; /* bits per component */
66 
67  int maxval;
68  int near;
69  int t1,t2,t3;
70  int reset;
71 
72  int width, height;
77  int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
85  int h_max, v_max; /* maximum h and v counts */
86  int quant_index[4]; /* quant table index for each component */
87  int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
88  AVFrame *picture; /* picture structure */
89  AVFrame *picture_ptr; /* pointer to picture structure */
92  int8_t *qscale_table;
93  DECLARE_ALIGNED(16, int16_t, block)[64];
94  int16_t (*blocks[MAX_COMPONENTS])[64];
100 
103 
107 
109 
110  int cur_scan; /* current scan, used by JPEG-LS */
111  int flipped; /* true if picture is flipped */
112 
113  uint16_t (*ljpeg_buffer)[4];
114  unsigned int ljpeg_buffer_size;
115 
117 
120 
124  void *data, int *got_frame,
125  AVPacket *avpkt);
130  const uint8_t *mb_bitmask, const AVFrame *reference);
132  const uint8_t **buf_ptr, const uint8_t *buf_end,
133  const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
134 
135 #endif /* AVCODEC_MJPEGDEC_H */