FFmpeg  4.4.4
mjpegdec.h
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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 {
49  int length;
50 } ICCEntry;
51 
52 typedef struct MJpegDecodeContext {
53  AVClass *class;
56  int buf_size;
57 
59 
60  int start_code; /* current start code */
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;
75  int bayer; /* true if it's a bayer-encoded JPEG embedded in a DNG */
76  int rgb;
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;
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;
96  int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
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)
116  uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
122 
125 
130 
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 
141 
142  AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation)
143 
145 
147  int iccnum;
148  int iccread;
149 
153 
154  // Raw stream data for hwaccel use.
159 
162 
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);
177  const uint8_t *mb_bitmask,int mb_bitmask_size,
178  const AVFrame *reference);
180  const uint8_t **buf_ptr, const uint8_t *buf_end,
181  const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
182 
184 
185 #endif /* AVCODEC_MJPEGDEC_H */
uint8_t
Libavcodec external API header.
#define s(width, name)
Definition: cbs_vp9.c:257
static AVFrame * frame
bitstream reader API header.
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:117
Stereoscopic video.
int ff_sp5x_process_packet(AVCodecContext *avctx, AVPacket *avpkt)
Definition: sp5xdec.c:33
int ff_mjpeg_find_marker(MJpegDecodeContext *s, const uint8_t **buf_ptr, const uint8_t *buf_end, const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size)
Definition: mjpegdec.c:2205
int ff_mjpeg_decode_init(AVCodecContext *avctx)
Definition: mjpegdec.c:117
int ff_mjpeg_decode_end(AVCodecContext *avctx)
Definition: mjpegdec.c:2892
int ff_mjpeg_build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, int is_ac, void *logctx)
#define MAX_COMPONENTS
Definition: mjpegdec.h:45
int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
Definition: mjpegdec.c:195
int ff_mjpeg_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Definition: mjpegdec.c:2399
int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask, int mb_bitmask_size, const AVFrame *reference)
Definition: mjpegdec.c:1633
int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
Definition: mjpegdec.c:297
int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
Definition: mjpegdec.c:236
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
Describe the class of an AVClass context structure.
Definition: log.h:67
main external API structure.
Definition: avcodec.h:536
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
This structure stores compressed data.
Definition: packet.h:346
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
Stereo 3D type: this structure describes how two videos are packed within a single video surface,...
Definition: stereo3d.h:176
Half-pel DSP context.
Definition: hpeldsp.h:45
uint8_t * data
Definition: mjpegdec.h:48
int length
Definition: mjpegdec.h:49
uint8_t upscale_v[4]
Definition: mjpegdec.h:78
AVStereo3D * stereo3d
Definition: mjpegdec.h:142
HpelDSPContext hdsp
Definition: mjpegdec.h:120
int block_stride[MAX_COMPONENTS]
Definition: mjpegdec.h:94
int reset
context halfing interval ?rename
Definition: mjpegdec.h:89
size_t raw_scan_buffer_size
Definition: mjpegdec.h:158
AVPacket * pkt
Definition: mjpegdec.h:58
enum AVPixelFormat hwaccel_pix_fmt
Definition: mjpegdec.h:164
int nb_blocks[MAX_COMPONENTS]
Definition: mjpegdec.h:101
int ac_index[MAX_COMPONENTS]
Definition: mjpegdec.h:100
ICCEntry * iccentries
Definition: mjpegdec.h:146
int h_count[MAX_COMPONENTS]
Definition: mjpegdec.h:96
uint8_t raw_huffman_lengths[2][4][16]
Definition: mjpegdec.h:160
int16_t block[64]
Definition: mjpegdec.h:113
int linesize[MAX_COMPONENTS]
linesize << interlaced
Definition: mjpegdec.h:111
IDCTDSPContext idsp
Definition: mjpegdec.h:121
void * hwaccel_picture_private
Definition: mjpegdec.h:165
int component_id[MAX_COMPONENTS]
Definition: mjpegdec.h:95
uint8_t * buffer
Definition: mjpegdec.h:62
int qscale[4]
quantizer scale calculated from quant_matrixes
Definition: mjpegdec.h:66
uint8_t * last_nnz[MAX_COMPONENTS]
Definition: mjpegdec.h:115
AVFrame * picture_ptr
Definition: mjpegdec.h:109
GetBitContext gb
Definition: mjpegdec.h:55
uint8_t raw_huffman_values[2][4][256]
Definition: mjpegdec.h:161
int comp_index[MAX_COMPONENTS]
Definition: mjpegdec.h:98
int quant_sindex[MAX_COMPONENTS]
Definition: mjpegdec.h:104
uint64_t coefs_finished[MAX_COMPONENTS]
bitmask of which coefs have been completely decoded (progressive mode)
Definition: mjpegdec.h:116
uint16_t quant_matrixes[4][64]
Definition: mjpegdec.h:64
enum AVPixelFormat hwaccel_sw_pix_fmt
Definition: mjpegdec.h:163
const AVPixFmtDescriptor * pix_desc
!< stereoscopic information (cached, since it is read before frame allocation)
Definition: mjpegdec.h:144
AVFrame * smv_frame
Definition: mjpegdec.h:150
int v_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:103
ScanTable scantable
Definition: mjpegdec.h:118
int16_t(*[MAX_COMPONENTS] blocks)[64]
intermediate sums (progressive mode)
Definition: mjpegdec.h:114
uint8_t upscale_h[4]
Definition: mjpegdec.h:77
int got_picture
we found a SOF and picture is valid, too.
Definition: mjpegdec.h:110
size_t raw_image_buffer_size
Definition: mjpegdec.h:156
int quant_index[4]
Definition: mjpegdec.h:106
uint16_t(* ljpeg_buffer)[4]
Definition: mjpegdec.h:136
int8_t * qscale_table
Definition: mjpegdec.h:112
int dc_index[MAX_COMPONENTS]
Definition: mjpegdec.h:99
int h_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:102
AVDictionary * exif_metadata
Definition: mjpegdec.h:140
VLC vlcs[3][4]
Definition: mjpegdec.h:65
int v_count[MAX_COMPONENTS]
Definition: mjpegdec.h:97
int near
near lossless bound (si 0 for lossless)
Definition: mjpegdec.h:87
const uint8_t * raw_scan_buffer
Definition: mjpegdec.h:157
BlockDSPContext bdsp
Definition: mjpegdec.h:119
const uint8_t * raw_image_buffer
Definition: mjpegdec.h:155
AVCodecContext * avctx
Definition: mjpegdec.h:54
unsigned int ljpeg_buffer_size
Definition: mjpegdec.h:137
AVFrame * picture
Definition: mjpegdec.h:108
int last_dc[MAX_COMPONENTS]
Definition: mjpegdec.h:107
Scantable.
Definition: idctdsp.h:31
Definition: vlc.h:26