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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
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  */
24 /**
25  * @file
26  * MJPEG decoder.
27  */
32 #include "libavutil/log.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/stereo3d.h"
36 #include "avcodec.h"
37 #include "blockdsp.h"
38 #include "get_bits.h"
39 #include "hpeldsp.h"
40 #include "idctdsp.h"
42 #undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */
44 #define MAX_COMPONENTS 4
46 typedef struct MJpegDecodeContext {
47  AVClass *class;
50  int buf_size;
52  int start_code; /* current start code */
56  uint16_t quant_matrixes[4][64];
57  VLC vlcs[3][4];
58  int qscale[4]; ///< quantizer scale calculated from quant_matrixes
60  int org_height; /* size given at codec init */
61  int first_picture; /* true if decoding first picture */
62  int interlaced; /* true if interlaced */
63  int bottom_field; /* true if bottom field */
64  int lossless;
65  int ls;
67  int rgb;
70  int rct; /* standard rct */
71  int pegasus_rct; /* pegasus reversible colorspace transform */
72  int bits; /* bits per component */
73  int colr;
74  int xfrm;
77  int maxval;
78  int near; ///< near lossless bound (si 0 for lossless)
79  int t1,t2,t3;
80  int reset; ///< context halfing interval ?rename
82  int width, height;
87  int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
96  int h_max, v_max; /* maximum h and v counts */
97  int quant_index[4]; /* quant table index for each component */
98  int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
99  AVFrame *picture; /* picture structure */
100  AVFrame *picture_ptr; /* pointer to picture structure */
101  int got_picture; ///< we found a SOF and picture is valid, too.
102  int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
103  int8_t *qscale_table;
104  DECLARE_ALIGNED(32, int16_t, block)[64];
105  int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
107  uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
124  int cur_scan; /* current scan, used by JPEG-LS */
125  int flipped; /* true if picture is flipped */
127  uint16_t (*ljpeg_buffer)[4];
128  unsigned int ljpeg_buffer_size;
133  AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation)
139  int iccnum;
140  int iccread;
142  // Raw stream data for hwaccel use.
159  void *data, int *got_frame,
160  AVPacket *avpkt);
165  const uint8_t *mb_bitmask,int mb_bitmask_size,
166  const AVFrame *reference);
168  const uint8_t **buf_ptr, const uint8_t *buf_end,
169  const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
171 #endif /* AVCODEC_MJPEGDEC_H */
int block_stride[MAX_COMPONENTS]
Definition: mjpegdec.h:85
int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask, int mb_bitmask_size, const AVFrame *reference)
Definition: mjpegdec.c:1541
const AVPixFmtDescriptor * pix_desc
!< stereoscopic information (cached, since it is read before frame allocation)
Definition: mjpegdec.h:135
int v_count[MAX_COMPONENTS]
Definition: mjpegdec.h:88
This structure describes decoded (raw) audio or video data.
Definition: frame.h:218
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
enum AVPixelFormat hwaccel_sw_pix_fmt
Definition: mjpegdec.h:151
size_t raw_image_buffer_size
Definition: mjpegdec.h:144
int h_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:93
BlockDSPContext bdsp
Definition: mjpegdec.h:110
Definition: idctdsp.h:31
int qscale[4]
quantizer scale calculated from quant_matrixes
Definition: mjpegdec.h:58
uint8_t * buffer
Definition: mjpegdec.h:54
int dc_index[MAX_COMPONENTS]
Definition: mjpegdec.h:90
int linesize[MAX_COMPONENTS]
linesize << interlaced
Definition: mjpegdec.h:102
uint8_t upscale_v[4]
Definition: mjpegdec.h:69
int ff_mjpeg_decode_init(AVCodecContext *avctx)
Definition: mjpegdec.c:127
int comp_index[MAX_COMPONENTS]
Definition: mjpegdec.h:89
HpelDSPContext hdsp
Definition: mjpegdec.h:111
const uint8_t * raw_image_buffer
Definition: mjpegdec.h:143
int16_t block[64]
Definition: mjpegdec.h:104
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:127
unsigned int ljpeg_buffer_size
Definition: mjpegdec.h:128
uint8_t * last_nnz[MAX_COMPONENTS]
Definition: mjpegdec.h:106
AVFrame * picture_ptr
Definition: mjpegdec.h:100
#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:95
Definition: mjpegdec.h:44
int h_count[MAX_COMPONENTS]
Definition: mjpegdec.h:87
bitstream reader API header.
int ff_mjpeg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: mjpegdec.c:2241
int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
Definition: mjpegdec.c:188
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:2107
AVDictionary * exif_metadata
Definition: mjpegdec.h:131
uint8_t ** iccdata
Definition: mjpegdec.h:137
int nb_blocks[MAX_COMPONENTS]
Definition: mjpegdec.h:92
VLC vlcs[3][4]
Definition: mjpegdec.h:57
int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
Definition: mjpegdec.c:293
Definition: vlc.h:26
ScanTable scantable
Definition: mjpegdec.h:109
Half-pel DSP context.
Definition: hpeldsp.h:45
int near
near lossless bound (si 0 for lossless)
Definition: mjpegdec.h:78
int component_id[MAX_COMPONENTS]
Definition: mjpegdec.h:86
uint8_t raw_huffman_lengths[2][4][16]
Definition: mjpegdec.h:148
#define s(width, name)
Definition: cbs_vp9.c:257
int quant_index[4]
Definition: mjpegdec.h:97
int v_scount[MAX_COMPONENTS]
Definition: mjpegdec.h:94
GetBitContext gb
Definition: mjpegdec.h:49
int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
Definition: mjpegdec.c:229
IDCTDSPContext idsp
Definition: mjpegdec.h:112
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:133
main external API structure.
Definition: avcodec.h:1519
int8_t * qscale_table
Definition: mjpegdec.h:103
Describe the class of an AVClass context structure.
Definition: log.h:67
int ac_index[MAX_COMPONENTS]
Definition: mjpegdec.h:91
int reset
context halfing interval ?rename
Definition: mjpegdec.h:80
uint64_t coefs_finished[MAX_COMPONENTS]
bitmask of which coefs have been completely decoded (progressive mode)
Definition: mjpegdec.h:107
enum AVPixelFormat hwaccel_pix_fmt
Definition: mjpegdec.h:152
uint8_t raw_huffman_values[2][4][256]
Definition: mjpegdec.h:149
size_t raw_scan_buffer_size
Definition: mjpegdec.h:146
Stereoscopic video.
const uint8_t * raw_scan_buffer
Definition: mjpegdec.h:145
AVCodecContext * avctx
Definition: mjpegdec.h:48
int got_picture
we found a SOF and picture is valid, too.
Definition: mjpegdec.h:101
int16_t(*[MAX_COMPONENTS] blocks)[64]
intermediate sums (progressive mode)
Definition: mjpegdec.h:105
AVFrame * picture
Definition: mjpegdec.h:99
void * hwaccel_picture_private
Definition: mjpegdec.h:153
int last_dc[MAX_COMPONENTS]
Definition: mjpegdec.h:98
uint8_t upscale_h[4]
Definition: mjpegdec.h:68
int ff_mjpeg_decode_end(AVCodecContext *avctx)
Definition: mjpegdec.c:2720
Pixel format.
Definition: pixfmt.h:60
This structure stores compressed data.
Definition: avcodec.h:1408
uint16_t quant_matrixes[4][64]
Definition: mjpegdec.h:56