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 
34 #include "avcodec.h"
35 #include "get_bits.h"
36 #include "dsputil.h"
37 
38 #define MAX_COMPONENTS 4
39 
40 typedef struct MJpegDecodeContext {
41  AVClass *class;
44 
45  int start_code; /* current start code */
47  uint8_t *buffer;
48 
49  int16_t quant_matrixes[4][64];
50  VLC vlcs[3][4];
51  int qscale[4];
52 
53  int org_height; /* size given at codec init */
54  int first_picture; /* true if decoding first picture */
55  int interlaced; /* true if interlaced */
56  int bottom_field; /* true if bottom field */
57  int lossless;
58  int ls;
60  int rgb;
61  int rct; /* standard rct */
62  int pegasus_rct; /* pegasus reversible colorspace transform */
63  int bits; /* bits per component */
64 
65  int maxval;
66  int near;
67  int t1,t2,t3;
68  int reset;
69 
70  int width, height;
75  int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
83  int h_max, v_max; /* maximum h and v counts */
84  int quant_index[4]; /* quant table index for each component */
85  int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
86  AVFrame picture; /* picture structure */
87  AVFrame *picture_ptr; /* pointer to picture structure */
90  int8_t *qscale_table;
97 
100 
104 
106 
107  int cur_scan; /* current scan, used by JPEG-LS */
108  int flipped; /* true if picture is flipped */
109 
110  uint16_t (*ljpeg_buffer)[4];
111  unsigned int ljpeg_buffer_size;
112 
115 
119  void *data, int *data_size,
120  AVPacket *avpkt);
125  const uint8_t *mb_bitmask, const AVFrame *reference);
127  const uint8_t **buf_ptr, const uint8_t *buf_end,
128  const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
129 
130 #endif /* AVCODEC_MJPEGDEC_H */