3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
7 * This file is part of FFmpeg.
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.
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.
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
29 #ifndef AVCODEC_MJPEGDEC_H
30 #define AVCODEC_MJPEGDEC_H
32 #include "libavutil/log.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/stereo3d.h"
42 #define MAX_COMPONENTS 4
44 typedef struct MJpegDecodeContext
{
46 AVCodecContext
*avctx
;
49 int start_code
; /* current start code */
53 int16_t quant_matrixes
[4][64];
55 int qscale
[4]; ///< quantizer scale calculated from quant_matrixes
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 */
67 int rct
; /* standard rct */
68 int pegasus_rct
; /* pegasus reversible colorspace transform */
69 int bits
; /* bits per component */
75 int near
; ///< near lossless bound (si 0 for lossless)
77 int reset
; ///< context halfing interval ?rename
80 int mb_width
, mb_height
;
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)
107 BlockDSPContext bdsp
;
111 int restart_interval
;
116 int interlace_polarity
;
120 int cur_scan
; /* current scan, used by JPEG-LS */
121 int flipped
; /* true if picture is flipped */
123 uint16_t (*ljpeg_buffer
)[4];
124 unsigned int ljpeg_buffer_size
;
127 AVDictionary
*exif_metadata
;
129 AVStereo3D
*stereo3d
; ///!< stereoscopic information (cached, since it is read before frame allocation)
131 const AVPixFmtDescriptor
*pix_desc
;
132 } MJpegDecodeContext
;
134 int ff_mjpeg_decode_init(AVCodecContext
*avctx
);
135 int ff_mjpeg_decode_end(AVCodecContext
*avctx
);
136 int ff_mjpeg_decode_frame(AVCodecContext
*avctx
,
137 void *data
, int *got_frame
,
139 int ff_mjpeg_decode_dqt(MJpegDecodeContext
*s
);
140 int ff_mjpeg_decode_dht(MJpegDecodeContext
*s
);
141 int ff_mjpeg_decode_sof(MJpegDecodeContext
*s
);
142 int ff_mjpeg_decode_sos(MJpegDecodeContext
*s
,
143 const uint8_t *mb_bitmask
,int mb_bitmask_size
,
144 const AVFrame
*reference
);
145 int ff_mjpeg_find_marker(MJpegDecodeContext
*s
,
146 const uint8_t **buf_ptr
, const uint8_t *buf_end
,
147 const uint8_t **unescaped_buf_ptr
, int *unescaped_buf_size
);
149 #endif /* AVCODEC_MJPEGDEC_H */