blob: 024cedcb5ad69915efae93b1c34d92ee07119a26
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 "libavutil/log.h" |
33 | #include "libavutil/pixdesc.h" |
34 | #include "libavutil/stereo3d.h" |
35 | |
36 | #include "avcodec.h" |
37 | #include "blockdsp.h" |
38 | #include "get_bits.h" |
39 | #include "hpeldsp.h" |
40 | #include "idctdsp.h" |
41 | |
42 | #define MAX_COMPONENTS 4 |
43 | |
44 | typedef struct MJpegDecodeContext { |
45 | AVClass *class; |
46 | AVCodecContext *avctx; |
47 | GetBitContext gb; |
48 | |
49 | int start_code; /* current start code */ |
50 | int buffer_size; |
51 | uint8_t *buffer; |
52 | |
53 | uint16_t quant_matrixes[4][64]; |
54 | VLC vlcs[3][4]; |
55 | int qscale[4]; ///< quantizer scale calculated from quant_matrixes |
56 | |
57 | int org_height; /* size given at codec init */ |
58 | int first_picture; /* true if decoding first picture */ |
59 | int interlaced; /* true if interlaced */ |
60 | int bottom_field; /* true if bottom field */ |
61 | int lossless; |
62 | int ls; |
63 | int progressive; |
64 | int rgb; |
65 | uint8_t upscale_h[4]; |
66 | uint8_t upscale_v[4]; |
67 | int rct; /* standard rct */ |
68 | int pegasus_rct; /* pegasus reversible colorspace transform */ |
69 | int bits; /* bits per component */ |
70 | int colr; |
71 | int xfrm; |
72 | int adobe_transform; |
73 | |
74 | int maxval; |
75 | int near; ///< near lossless bound (si 0 for lossless) |
76 | int t1,t2,t3; |
77 | int reset; ///< context halfing interval ?rename |
78 | |
79 | int width, height; |
80 | int mb_width, mb_height; |
81 | int nb_components; |
82 | int block_stride[MAX_COMPONENTS]; |
83 | int component_id[MAX_COMPONENTS]; |
84 | int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */ |
85 | int v_count[MAX_COMPONENTS]; |
86 | int comp_index[MAX_COMPONENTS]; |
87 | int dc_index[MAX_COMPONENTS]; |
88 | int ac_index[MAX_COMPONENTS]; |
89 | int nb_blocks[MAX_COMPONENTS]; |
90 | int h_scount[MAX_COMPONENTS]; |
91 | int v_scount[MAX_COMPONENTS]; |
92 | int quant_sindex[MAX_COMPONENTS]; |
93 | int h_max, v_max; /* maximum h and v counts */ |
94 | int quant_index[4]; /* quant table index for each component */ |
95 | int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */ |
96 | AVFrame *picture; /* picture structure */ |
97 | AVFrame *picture_ptr; /* pointer to picture structure */ |
98 | int got_picture; ///< we found a SOF and picture is valid, too. |
99 | int linesize[MAX_COMPONENTS]; ///< linesize << interlaced |
100 | int8_t *qscale_table; |
101 | DECLARE_ALIGNED(16, int16_t, block)[64]; |
102 | int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode) |
103 | uint8_t *last_nnz[MAX_COMPONENTS]; |
104 | uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode) |
105 | int palette_index; |
106 | ScanTable scantable; |
107 | BlockDSPContext bdsp; |
108 | HpelDSPContext hdsp; |
109 | IDCTDSPContext idsp; |
110 | |
111 | int restart_interval; |
112 | int restart_count; |
113 | |
114 | int buggy_avid; |
115 | int cs_itu601; |
116 | int interlace_polarity; |
117 | int multiscope; |
118 | |
119 | int mjpb_skiptosod; |
120 | |
121 | int cur_scan; /* current scan, used by JPEG-LS */ |
122 | int flipped; /* true if picture is flipped */ |
123 | |
124 | uint16_t (*ljpeg_buffer)[4]; |
125 | unsigned int ljpeg_buffer_size; |
126 | |
127 | int extern_huff; |
128 | AVDictionary *exif_metadata; |
129 | |
130 | AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation) |
131 | |
132 | const AVPixFmtDescriptor *pix_desc; |
133 | } MJpegDecodeContext; |
134 | |
135 | int ff_mjpeg_decode_init(AVCodecContext *avctx); |
136 | int ff_mjpeg_decode_end(AVCodecContext *avctx); |
137 | int ff_mjpeg_decode_frame(AVCodecContext *avctx, |
138 | void *data, int *got_frame, |
139 | AVPacket *avpkt); |
140 | int ff_mjpeg_decode_dqt(MJpegDecodeContext *s); |
141 | int ff_mjpeg_decode_dht(MJpegDecodeContext *s); |
142 | int ff_mjpeg_decode_sof(MJpegDecodeContext *s); |
143 | int ff_mjpeg_decode_sos(MJpegDecodeContext *s, |
144 | const uint8_t *mb_bitmask,int mb_bitmask_size, |
145 | const AVFrame *reference); |
146 | int ff_mjpeg_find_marker(MJpegDecodeContext *s, |
147 | const uint8_t **buf_ptr, const uint8_t *buf_end, |
148 | const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size); |
149 | |
150 | #endif /* AVCODEC_MJPEGDEC_H */ |
151 |