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"
38 #define MAX_COMPONENTS 4
40 typedef struct MJpegDecodeContext {
42 AVCodecContext *avctx;
45 int start_code; /* current start code */
49 int16_t quant_matrixes[4][64];
51 int qscale[4]; ///< quantizer scale calculated from quant_matrixes
53 int org_height; /* size given at codec init */
54 int first_picture; /* true if decoding first picture */
55 int interlaced; /* true if interlaced */
56 int bottom_field; /* true if bottom field */
63 int rct; /* standard rct */
64 int pegasus_rct; /* pegasus reversible colorspace transform */
65 int bits; /* bits per component */
68 int near; ///< near lossless bound (si 0 for lossless)
70 int reset; ///< context halfing intervall ?rename
73 int mb_width, mb_height;
75 int block_stride[MAX_COMPONENTS];
76 int component_id[MAX_COMPONENTS];
77 int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
78 int v_count[MAX_COMPONENTS];
79 int comp_index[MAX_COMPONENTS];
80 int dc_index[MAX_COMPONENTS];
81 int ac_index[MAX_COMPONENTS];
82 int nb_blocks[MAX_COMPONENTS];
83 int h_scount[MAX_COMPONENTS];
84 int v_scount[MAX_COMPONENTS];
85 int h_max, v_max; /* maximum h and v counts */
86 int quant_index[4]; /* quant table index for each component */
87 int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
88 AVFrame picture; /* picture structure */
89 AVFrame *picture_ptr; /* pointer to picture structure */
90 int got_picture; ///< we found a SOF and picture is valid, too.
91 int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
93 DECLARE_ALIGNED(16, DCTELEM, block)[64];
94 DCTELEM (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
95 uint8_t *last_nnz[MAX_COMPONENTS];
96 uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
100 int restart_interval;
105 int interlace_polarity;
109 int cur_scan; /* current scan, used by JPEG-LS */
110 int flipped; /* true if picture is flipped */
112 uint16_t (*ljpeg_buffer)[4];
113 unsigned int ljpeg_buffer_size;
116 } MJpegDecodeContext;
118 int ff_mjpeg_decode_init(AVCodecContext *avctx);
119 int ff_mjpeg_decode_end(AVCodecContext *avctx);
120 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
121 void *data, int *data_size,
123 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
124 int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
125 int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
126 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
127 const uint8_t *mb_bitmask, const AVFrame *reference);
128 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
129 const uint8_t **buf_ptr, const uint8_t *buf_end,
130 const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
132 #endif /* AVCODEC_MJPEGDEC_H */