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