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 FFMPEG_MJPEGDEC_H
30 #define FFMPEG_MJPEGDEC_H
33 #include "bitstream.h"
35 #include "mpegvideo.h"
37 #define MAX_COMPONENTS 4
39 typedef struct MJpegDecodeContext
{
40 AVCodecContext
*avctx
;
43 int start_code
; /* current start code */
47 int16_t quant_matrixes
[4][64];
49 int qscale
[4]; ///< quantizer scale calculated from quant_matrixes
51 int org_height
; /* size given at codec init */
52 int first_picture
; /* true if decoding first picture */
53 int interlaced
; /* true if interlaced */
54 int bottom_field
; /* true if bottom field */
59 int rct
; /* standard rct */
60 int pegasus_rct
; /* pegasus reversible colorspace transform */
61 int bits
; /* bits per component */
64 int near
; ///< near lossless bound (si 0 for lossless)
66 int reset
; ///< context halfing intervall ?rename
69 int mb_width
, mb_height
;
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 linesize
[MAX_COMPONENTS
]; ///< linesize << interlaced
86 DECLARE_ALIGNED_8(DCTELEM
, block
[64]);
95 int interlace_polarity
;
99 int cur_scan
; /* current scan, used by JPEG-LS */
100 } MJpegDecodeContext
;
102 int ff_mjpeg_decode_init(AVCodecContext
*avctx
);
103 int ff_mjpeg_decode_end(AVCodecContext
*avctx
);
104 int ff_mjpeg_decode_frame(AVCodecContext
*avctx
,
105 void *data
, int *data_size
,
106 uint8_t *buf
, int buf_size
);
107 int ff_mjpeg_decode_dqt(MJpegDecodeContext
*s
);
108 int ff_mjpeg_decode_dht(MJpegDecodeContext
*s
);
109 int ff_mjpeg_decode_sof(MJpegDecodeContext
*s
);
110 int ff_mjpeg_decode_sos(MJpegDecodeContext
*s
);
112 #endif /* FFMPEG_MJPEGDEC_H */