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 */