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 FFmpeg.
8 *
9 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24/**
25 * @file
26 * MJPEG decoder.
27 */
28
29#ifndef AVCODEC_MJPEGDEC_H
30#define AVCODEC_MJPEGDEC_H
31
32#include "avcodec.h"
33#include "get_bits.h"
34#include "dsputil.h"
35
36#define MAX_COMPONENTS 4
37
38typedef struct MJpegDecodeContext {
39    AVCodecContext *avctx;
40    GetBitContext gb;
41
42    int start_code; /* current start code */
43    int buffer_size;
44    uint8_t *buffer;
45
46    int16_t quant_matrixes[4][64];
47    VLC vlcs[2][4];
48    int qscale[4];      ///< quantizer scale calculated from quant_matrixes
49
50    int org_height;  /* size given at codec init */
51    int first_picture;    /* true if decoding first picture */
52    int interlaced;     /* true if interlaced */
53    int bottom_field;   /* true if bottom field */
54    int lossless;
55    int ls;
56    int progressive;
57    int rgb;
58    int rct;            /* standard rct */
59    int pegasus_rct;    /* pegasus reversible colorspace transform */
60    int bits;           /* bits per component */
61
62    int maxval;
63    int near;         ///< near lossless bound (si 0 for lossless)
64    int t1,t2,t3;
65    int reset;        ///< context halfing intervall ?rename
66
67    int width, height;
68    int mb_width, mb_height;
69    int nb_components;
70    int block_stride[MAX_COMPONENTS];
71    int component_id[MAX_COMPONENTS];
72    int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
73    int v_count[MAX_COMPONENTS];
74    int comp_index[MAX_COMPONENTS];
75    int dc_index[MAX_COMPONENTS];
76    int ac_index[MAX_COMPONENTS];
77    int nb_blocks[MAX_COMPONENTS];
78    int h_scount[MAX_COMPONENTS];
79    int v_scount[MAX_COMPONENTS];
80    int h_max, v_max; /* maximum h and v counts */
81    int quant_index[4];   /* quant table index for each component */
82    int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
83    AVFrame picture; /* picture structure */
84    int got_picture;                                ///< we found a SOF and picture is valid, too.
85    int linesize[MAX_COMPONENTS];                   ///< linesize << interlaced
86    int8_t *qscale_table;
87    DECLARE_ALIGNED(16, DCTELEM, block)[64];
88    DCTELEM (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
89    uint8_t *last_nnz[MAX_COMPONENTS];
90    uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
91    ScanTable scantable;
92    DSPContext dsp;
93
94    int restart_interval;
95    int restart_count;
96
97    int buggy_avid;
98    int cs_itu601;
99    int interlace_polarity;
100
101    int mjpb_skiptosod;
102
103    int cur_scan; /* current scan, used by JPEG-LS */
104    int flipped; /* true if picture is flipped */
105
106    uint16_t (*ljpeg_buffer)[4];
107    unsigned int ljpeg_buffer_size;
108} MJpegDecodeContext;
109
110int ff_mjpeg_decode_init(AVCodecContext *avctx);
111int ff_mjpeg_decode_end(AVCodecContext *avctx);
112int ff_mjpeg_decode_frame(AVCodecContext *avctx,
113                          void *data, int *data_size,
114                          AVPacket *avpkt);
115int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
116int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
117int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
118int ff_mjpeg_decode_sos(MJpegDecodeContext *s);
119
120#endif /* AVCODEC_MJPEGDEC_H */
121