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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/pixdesc.h"
34 #include "libavutil/stereo3d.h"
35 
36 #include "avcodec.h"
37 #include "blockdsp.h"
38 #include "get_bits.h"
39 #include "hpeldsp.h"
40 #include "idctdsp.h"
41 
42 #undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */
43 
44 #define MAX_COMPONENTS 4
45 
46 typedef struct MJpegDecodeContext {
47  AVClass *class;
50 
51  int start_code; /* current start code */
54 
55  uint16_t quant_matrixes[4][64];
56  VLC vlcs[3][4];
57  int qscale[4]; ///< quantizer scale calculated from quant_matrixes
58 
59  int org_height; /* size given at codec init */
60  int first_picture; /* true if decoding first picture */
61  int interlaced; /* true if interlaced */
62  int bottom_field; /* true if bottom field */
63  int lossless;
64  int ls;
66  int rgb;
69  int rct; /* standard rct */
70  int pegasus_rct; /* pegasus reversible colorspace transform */
71  int bits; /* bits per component */
72  int colr;
73  int xfrm;
75 
76  int maxval;
77  int near; ///< near lossless bound (si 0 for lossless)
78  int t1,t2,t3;
79  int reset; ///< context halfing interval ?rename
80 
81  int width, height;
86  int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
95  int h_max, v_max; /* maximum h and v counts */
96  int quant_index[4]; /* quant table index for each component */
97  int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
98  AVFrame *picture; /* picture structure */
99  AVFrame *picture_ptr; /* pointer to picture structure */
100  int got_picture; ///< we found a SOF and picture is valid, too.
101  int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
102  int8_t *qscale_table;
103  DECLARE_ALIGNED(32, int16_t, block)[64];
104  int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
106  uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
112 
115 
120 
122 
123  int cur_scan; /* current scan, used by JPEG-LS */
124  int flipped; /* true if picture is flipped */
125 
126  uint16_t (*ljpeg_buffer)[4];
127  unsigned int ljpeg_buffer_size;
128 
131 
132  AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation)
133 
135 
138  int iccnum;
139  int iccread;
141 
145  void *data, int *got_frame,
146  AVPacket *avpkt);
151  const uint8_t *mb_bitmask,int mb_bitmask_size,
152  const AVFrame *reference);
154  const uint8_t **buf_ptr, const uint8_t *buf_end,
155  const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
156 
157 #endif /* AVCODEC_MJPEGDEC_H */
int block_stride[MAX_COMPONENTS]
Definition: mjpegdec.h:84
int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask, int mb_bitmask_size, const AVFrame *reference)
Definition: mjpegdec.c:1490
const AVPixFmtDescriptor * pix_desc
!< stereoscopic information (cached, since it is read before frame allocation)
Definition: mjpegdec.h:134
const char * s
Definition: avisynth_c.h:768
int v_count[MAX_COMPONENTS]
Definition: mjpegdec.h:87
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int h_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:92
BlockDSPContext bdsp
Definition: mjpegdec.h:109
Scantable.
Definition: idctdsp.h:31
int qscale[4]
quantizer scale calculated from quant_matrixes
Definition: mjpegdec.h:57
uint8_t * buffer
Definition: mjpegdec.h:53
int dc_index[MAX_COMPONENTS]
Definition: mjpegdec.h:89
int linesize[MAX_COMPONENTS]
linesize << interlaced
Definition: mjpegdec.h:101
uint8_t upscale_v[4]
Definition: mjpegdec.h:68
int ff_mjpeg_decode_init(AVCodecContext *avctx)
Definition: mjpegdec.c:126
int comp_index[MAX_COMPONENTS]
Definition: mjpegdec.h:88
HpelDSPContext hdsp
Definition: mjpegdec.h:110
int16_t block[64]
Definition: mjpegdec.h:103
uint8_t
Stereo 3D type: this structure describes how two videos are packed within a single video surface...
Definition: stereo3d.h:176
uint16_t(* ljpeg_buffer)[4]
Definition: mjpegdec.h:126
unsigned int ljpeg_buffer_size
Definition: mjpegdec.h:127
uint8_t * last_nnz[MAX_COMPONENTS]
Definition: mjpegdec.h:105
AVFrame * picture_ptr
Definition: mjpegdec.h:99
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:112
int quant_sindex[MAX_COMPONENTS]
Definition: mjpegdec.h:94
#define MAX_COMPONENTS
Definition: mjpegdec.h:44
int h_count[MAX_COMPONENTS]
Definition: mjpegdec.h:86
bitstream reader API header.
int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mjpegdec.c:2180
int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
Definition: mjpegdec.c:186
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:2046
AVDictionary * exif_metadata
Definition: mjpegdec.h:130
uint8_t ** iccdata
Definition: mjpegdec.h:136
int nb_blocks[MAX_COMPONENTS]
Definition: mjpegdec.h:91
VLC vlcs[3][4]
Definition: mjpegdec.h:56
int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
Definition: mjpegdec.c:286
Definition: vlc.h:26
ScanTable scantable
Definition: mjpegdec.h:108
Half-pel DSP context.
Definition: hpeldsp.h:45
int near
near lossless bound (si 0 for lossless)
Definition: mjpegdec.h:77
int component_id[MAX_COMPONENTS]
Definition: mjpegdec.h:85
int quant_index[4]
Definition: mjpegdec.h:96
int v_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:93
GetBitContext gb
Definition: mjpegdec.h:49
int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
Definition: mjpegdec.c:227
IDCTDSPContext idsp
Definition: mjpegdec.h:111
Half-pel DSP functions.
Libavcodec external API header.
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
AVStereo3D * stereo3d
Definition: mjpegdec.h:132
main external API structure.
Definition: avcodec.h:1488
int8_t * qscale_table
Definition: mjpegdec.h:102
Describe the class of an AVClass context structure.
Definition: log.h:67
int ac_index[MAX_COMPONENTS]
Definition: mjpegdec.h:90
int reset
context halfing interval ?rename
Definition: mjpegdec.h:79
uint64_t coefs_finished[MAX_COMPONENTS]
bitmask of which coefs have been completely decoded (progressive mode)
Definition: mjpegdec.h:106
Stereoscopic video.
AVCodecContext * avctx
Definition: mjpegdec.h:48
int got_picture
we found a SOF and picture is valid, too.
Definition: mjpegdec.h:100
int16_t(*[MAX_COMPONENTS] blocks)[64]
intermediate sums (progressive mode)
Definition: mjpegdec.h:104
AVFrame * picture
Definition: mjpegdec.h:98
int last_dc[MAX_COMPONENTS]
Definition: mjpegdec.h:97
uint8_t upscale_h[4]
Definition: mjpegdec.h:67
int ff_mjpeg_decode_end(AVCodecContext *avctx)
Definition: mjpegdec.c:2637
This structure stores compressed data.
Definition: avcodec.h:1377
uint16_t quant_matrixes[4][64]
Definition: mjpegdec.h:55