• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /*
2  * MJPEG decoder
3  * Copyright (c) 2000, 2001 Fabrice Bellard
4  * Copyright (c) 2003 Alex Beregszaszi
5  * Copyright (c) 2003-2004 Michael Niedermayer
6  *
7  * This file is part of FFmpeg.
8  *
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.
13  *
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.
18  *
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
22  */
23 
24 /**
25  * @file
26  * MJPEG decoder.
27  */
28 
29 #ifndef AVCODEC_MJPEGDEC_H
30 #define AVCODEC_MJPEGDEC_H
31 
32 #include "libavutil/log.h"
33 #include "libavutil/mem_internal.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/stereo3d.h"
36 
37 #include "avcodec.h"
38 #include "blockdsp.h"
39 #include "get_bits.h"
40 #include "hpeldsp.h"
41 #include "idctdsp.h"
42 
43 #undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */
44 
45 #define MAX_COMPONENTS 4
46 
47 typedef struct ICCEntry {
48     uint8_t *data;
49     int    length;
50 } ICCEntry;
51 
52 typedef struct MJpegDecodeContext {
53     AVClass *class;
54     AVCodecContext *avctx;
55     GetBitContext gb;
56     int buf_size;
57 
58     AVPacket *pkt;
59 
60     int start_code; /* current start code */
61     int buffer_size;
62     uint8_t *buffer;
63 
64     uint16_t quant_matrixes[4][64];
65     VLC vlcs[3][4];
66     int qscale[4];      ///< quantizer scale calculated from quant_matrixes
67 
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 */
72     int lossless;
73     int ls;
74     int progressive;
75     int bayer;          /* true if it's a bayer-encoded JPEG embedded in a DNG */
76     int rgb;
77     uint8_t upscale_h[4];
78     uint8_t upscale_v[4];
79     int rct;            /* standard rct */
80     int pegasus_rct;    /* pegasus reversible colorspace transform */
81     int bits;           /* bits per component */
82     int colr;
83     int xfrm;
84     int adobe_transform;
85 
86     int maxval;
87     int near;         ///< near lossless bound (si 0 for lossless)
88     int t1,t2,t3;
89     int reset;        ///< context halfing interval ?rename
90 
91     int width, height;
92     int mb_width, mb_height;
93     int nb_components;
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)
117     int palette_index;
118     ScanTable scantable;
119     BlockDSPContext bdsp;
120     HpelDSPContext hdsp;
121     IDCTDSPContext idsp;
122 
123     int restart_interval;
124     int restart_count;
125 
126     int buggy_avid;
127     int cs_itu601;
128     int interlace_polarity;
129     int multiscope;
130 
131     int mjpb_skiptosod;
132 
133     int cur_scan; /* current scan, used by JPEG-LS */
134     int flipped; /* true if picture is flipped */
135 
136     uint16_t (*ljpeg_buffer)[4];
137     unsigned int ljpeg_buffer_size;
138 
139     int extern_huff;
140     AVDictionary *exif_metadata;
141 
142     AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation)
143 
144     const AVPixFmtDescriptor *pix_desc;
145 
146     ICCEntry *iccentries;
147     int iccnum;
148     int iccread;
149 
150     AVFrame *smv_frame;
151     int smv_frames_per_jpeg;
152     int smv_next_frame;
153 
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;
159 
160     uint8_t raw_huffman_lengths[2][4][16];
161     uint8_t raw_huffman_values[2][4][256];
162 
163     enum AVPixelFormat hwaccel_sw_pix_fmt;
164     enum AVPixelFormat hwaccel_pix_fmt;
165     void *hwaccel_picture_private;
166 } MJpegDecodeContext;
167 
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);
182 
183 int ff_sp5x_process_packet(AVCodecContext *avctx, AVPacket *avpkt);
184 
185 #endif /* AVCODEC_MJPEGDEC_H */
186