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 #undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */
44 #define MAX_COMPONENTS 4
46 typedef struct MJpegDecodeContext {
48 AVCodecContext *avctx;
52 int start_code; /* current start code */
56 uint16_t quant_matrixes[4][64];
58 int qscale[4]; ///< quantizer scale calculated from quant_matrixes
60 int org_height; /* size given at codec init */
61 int first_picture; /* true if decoding first picture */
62 int interlaced; /* true if interlaced */
63 int bottom_field; /* true if bottom field */
70 int rct; /* standard rct */
71 int pegasus_rct; /* pegasus reversible colorspace transform */
72 int bits; /* bits per component */
78 int near; ///< near lossless bound (si 0 for lossless)
80 int reset; ///< context halfing interval ?rename
83 int mb_width, mb_height;
85 int block_stride[MAX_COMPONENTS];
86 int component_id[MAX_COMPONENTS];
87 int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
88 int v_count[MAX_COMPONENTS];
89 int comp_index[MAX_COMPONENTS];
90 int dc_index[MAX_COMPONENTS];
91 int ac_index[MAX_COMPONENTS];
92 int nb_blocks[MAX_COMPONENTS];
93 int h_scount[MAX_COMPONENTS];
94 int v_scount[MAX_COMPONENTS];
95 int quant_sindex[MAX_COMPONENTS];
96 int h_max, v_max; /* maximum h and v counts */
97 int quant_index[4]; /* quant table index for each component */
98 int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
99 AVFrame *picture; /* picture structure */
100 AVFrame *picture_ptr; /* pointer to picture structure */
101 int got_picture; ///< we found a SOF and picture is valid, too.
102 int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
103 int8_t *qscale_table;
104 DECLARE_ALIGNED(32, int16_t, block)[64];
105 int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
106 uint8_t *last_nnz[MAX_COMPONENTS];
107 uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
110 BlockDSPContext bdsp;
114 int restart_interval;
119 int interlace_polarity;
124 int cur_scan; /* current scan, used by JPEG-LS */
125 int flipped; /* true if picture is flipped */
127 uint16_t (*ljpeg_buffer)[4];
128 unsigned int ljpeg_buffer_size;
131 AVDictionary *exif_metadata;
133 AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation)
135 const AVPixFmtDescriptor *pix_desc;
142 // Raw stream data for hwaccel use.
143 const uint8_t *raw_image_buffer;
144 size_t raw_image_buffer_size;
145 const uint8_t *raw_scan_buffer;
146 size_t raw_scan_buffer_size;
148 uint8_t raw_huffman_lengths[2][4][16];
149 uint8_t raw_huffman_values[2][4][256];
151 enum AVPixelFormat hwaccel_sw_pix_fmt;
152 enum AVPixelFormat hwaccel_pix_fmt;
153 void *hwaccel_picture_private;
154 } MJpegDecodeContext;
156 int ff_mjpeg_decode_init(AVCodecContext *avctx);
157 int ff_mjpeg_decode_end(AVCodecContext *avctx);
158 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
159 void *data, int *got_frame,
161 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
162 int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
163 int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
164 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
165 const uint8_t *mb_bitmask,int mb_bitmask_size,
166 const AVFrame *reference);
167 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
168 const uint8_t **buf_ptr, const uint8_t *buf_end,
169 const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
171 #endif /* AVCODEC_MJPEGDEC_H */