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/mem_internal.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/stereo3d.h"
43 #undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */
45 #define MAX_COMPONENTS 4
47 typedef struct ICCEntry {
54 typedef struct MJpegDecodeContext {
56 AVCodecContext *avctx;
62 int start_code; /* current start code */
66 uint16_t quant_matrixes[4][64];
68 int qscale[4]; ///< quantizer scale calculated from quant_matrixes
70 int orig_height; /* size given at codec init */
71 int first_picture; /* true if decoding first picture */
72 int interlaced; /* true if interlaced */
73 int bottom_field; /* true if bottom field */
77 int bayer; /* true if it's a bayer-encoded JPEG embedded in a DNG */
81 int rct; /* standard rct */
82 int pegasus_rct; /* pegasus reversible colorspace transform */
83 int bits; /* bits per component */
89 int near; ///< near lossless bound (si 0 for lossless)
91 int reset; ///< context halfing interval ?rename
94 int mb_width, mb_height;
96 int block_stride[MAX_COMPONENTS];
97 int component_id[MAX_COMPONENTS];
98 int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
99 int v_count[MAX_COMPONENTS];
100 int comp_index[MAX_COMPONENTS];
101 int dc_index[MAX_COMPONENTS];
102 int ac_index[MAX_COMPONENTS];
103 int nb_blocks[MAX_COMPONENTS];
104 int h_scount[MAX_COMPONENTS];
105 int v_scount[MAX_COMPONENTS];
106 int quant_sindex[MAX_COMPONENTS];
107 int h_max, v_max; /* maximum h and v counts */
108 int quant_index[4]; /* quant table index for each component */
109 int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
110 AVFrame *picture; /* picture structure */
111 AVFrame *picture_ptr; /* pointer to picture structure */
112 int got_picture; ///< we found a SOF and picture is valid, too.
113 int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
114 int8_t *qscale_table;
115 DECLARE_ALIGNED(32, int16_t, block)[64];
116 int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
117 uint8_t *last_nnz[MAX_COMPONENTS];
118 uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
121 BlockDSPContext bdsp;
125 int restart_interval;
130 int interlace_polarity;
135 int cur_scan; /* current scan, used by JPEG-LS */
136 int flipped; /* true if picture is flipped */
138 uint16_t (*ljpeg_buffer)[4];
139 unsigned int ljpeg_buffer_size;
142 AVDictionary *exif_metadata;
144 AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation)
146 const AVPixFmtDescriptor *pix_desc;
148 ICCEntry *iccentries;
153 int smv_frames_per_jpeg;
156 // Raw stream data for hwaccel use.
157 const uint8_t *raw_image_buffer;
158 size_t raw_image_buffer_size;
159 const uint8_t *raw_scan_buffer;
160 size_t raw_scan_buffer_size;
162 uint8_t raw_huffman_lengths[2][4][16];
163 uint8_t raw_huffman_values[2][4][256];
165 enum AVPixelFormat hwaccel_sw_pix_fmt;
166 enum AVPixelFormat hwaccel_pix_fmt;
167 void *hwaccel_picture_private;
168 struct JLSState *jls_state;
169 } MJpegDecodeContext;
171 int ff_mjpeg_build_vlc(VLC *vlc, const uint8_t *bits_table,
172 const uint8_t *val_table, int is_ac, void *logctx);
173 int ff_mjpeg_decode_init(AVCodecContext *avctx);
174 int ff_mjpeg_decode_end(AVCodecContext *avctx);
175 int ff_mjpeg_receive_frame(AVCodecContext *avctx, AVFrame *frame);
176 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
177 int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
178 int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
179 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
180 const uint8_t *mb_bitmask,int mb_bitmask_size,
181 const AVFrame *reference);
182 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
183 const uint8_t **buf_ptr, const uint8_t *buf_end,
184 const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
186 int ff_sp5x_process_packet(AVCodecContext *avctx, AVPacket *avpkt);
188 #endif /* AVCODEC_MJPEGDEC_H */