ffmpeg/libavcodec/mjpeg.h

   1 /*
   2  * MJPEG encoder and decoder
   3  * Copyright (c) 2000, 2001 Fabrice Bellard
   4  * Copyright (c) 2003 Alex Beregszaszi
   5  * Copyright (c) 2003-2004 Michael Niedermayer
   6  *
   7  * Support for external huffman table, various fixes (AVID workaround),
   8  * aspecting, new decode_frame mechanism and apple mjpeg-b support
   9  *                                  by Alex Beregszaszi
  10  *
  11  * This file is part of FFmpeg.
  12  *
  13  * FFmpeg is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU Lesser General Public
  15  * License as published by the Free Software Foundation; either
  16  * version 2.1 of the License, or (at your option) any later version.
  17  *
  18  * FFmpeg is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21  * Lesser General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU Lesser General Public
  24  * License along with FFmpeg; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  26  */
  27
  28 /**
  29  * @file
  30  * MJPEG encoder and decoder.
  31  */
  32
  33 #ifndef AVCODEC_MJPEG_H
  34 #define AVCODEC_MJPEG_H
  35
  36 #include "libavutil/internal.h"
  37
  38 #include "avcodec.h"
  39 #include "put_bits.h"
  40
  41 /* JPEG marker codes */
  42 typedef enum {
  43     /* start of frame */
  44     SOF0  = 0xc0,       /* baseline */
  45     SOF1  = 0xc1,       /* extended sequential, huffman */
  46     SOF2  = 0xc2,       /* progressive, huffman */
  47     SOF3  = 0xc3,       /* lossless, huffman */
  48
  49     SOF5  = 0xc5,       /* differential sequential, huffman */
  50     SOF6  = 0xc6,       /* differential progressive, huffman */
  51     SOF7  = 0xc7,       /* differential lossless, huffman */
  52     JPG   = 0xc8,       /* reserved for JPEG extension */
  53     SOF9  = 0xc9,       /* extended sequential, arithmetic */
  54     SOF10 = 0xca,       /* progressive, arithmetic */
  55     SOF11 = 0xcb,       /* lossless, arithmetic */
  56
  57     SOF13 = 0xcd,       /* differential sequential, arithmetic */
  58     SOF14 = 0xce,       /* differential progressive, arithmetic */
  59     SOF15 = 0xcf,       /* differential lossless, arithmetic */
  60
  61     DHT   = 0xc4,       /* define huffman tables */
  62
  63     DAC   = 0xcc,       /* define arithmetic-coding conditioning */
  64
  65     /* restart with modulo 8 count "m" */
  66     RST0  = 0xd0,
  67     RST1  = 0xd1,
  68     RST2  = 0xd2,
  69     RST3  = 0xd3,
  70     RST4  = 0xd4,
  71     RST5  = 0xd5,
  72     RST6  = 0xd6,
  73     RST7  = 0xd7,
  74
  75     SOI   = 0xd8,       /* start of image */
  76     EOI   = 0xd9,       /* end of image */
  77     SOS   = 0xda,       /* start of scan */
  78     DQT   = 0xdb,       /* define quantization tables */
  79     DNL   = 0xdc,       /* define number of lines */
  80     DRI   = 0xdd,       /* define restart interval */
  81     DHP   = 0xde,       /* define hierarchical progression */
  82     EXP   = 0xdf,       /* expand reference components */
  83
  84     APP0  = 0xe0,
  85     APP1  = 0xe1,
  86     APP2  = 0xe2,
  87     APP3  = 0xe3,
  88     APP4  = 0xe4,
  89     APP5  = 0xe5,
  90     APP6  = 0xe6,
  91     APP7  = 0xe7,
  92     APP8  = 0xe8,
  93     APP9  = 0xe9,
  94     APP10 = 0xea,
  95     APP11 = 0xeb,
  96     APP12 = 0xec,
  97     APP13 = 0xed,
  98     APP14 = 0xee,
  99     APP15 = 0xef,
 100
 101     JPG0  = 0xf0,
 102     JPG1  = 0xf1,
 103     JPG2  = 0xf2,
 104     JPG3  = 0xf3,
 105     JPG4  = 0xf4,
 106     JPG5  = 0xf5,
 107     JPG6  = 0xf6,
 108     SOF48 = 0xf7,       ///< JPEG-LS
 109     LSE   = 0xf8,       ///< JPEG-LS extension parameters
 110     JPG9  = 0xf9,
 111     JPG10 = 0xfa,
 112     JPG11 = 0xfb,
 113     JPG12 = 0xfc,
 114     JPG13 = 0xfd,
 115
 116     COM   = 0xfe,       /* comment */
 117
 118     TEM   = 0x01,       /* temporary private use for arithmetic coding */
 119
 120     /* 0x02 -> 0xbf reserved */
 121 } JPEG_MARKER;
 122
 123 static inline void put_marker(PutBitContext *p, int code)
 124 {
 125     put_bits(p, 8, 0xff);
 126     put_bits(p, 8, code);
 127 }
 128
 129 #define PREDICT(ret, topleft, top, left, predictor)\
 130     switch(predictor){\
 131         case 0: ret= 0; break;\
 132         case 1: ret= left; break;\
 133         case 2: ret= top; break;\
 134         case 3: ret= topleft; break;\
 135         case 4: ret= left   +   top - topleft; break;\
 136         case 5: ret= left   + ((top - topleft)>>1); break;\
 137         case 6: ret= top + ((left   - topleft)>>1); break;\
 138         default:\
 139         case 7: ret= (left + top)>>1; break;\
 140     }
 141
 142 extern av_export const uint8_t avpriv_mjpeg_bits_dc_luminance[];
 143 extern av_export const uint8_t avpriv_mjpeg_val_dc[];
 144
 145 extern av_export const uint8_t avpriv_mjpeg_bits_dc_chrominance[];
 146
 147 extern av_export const uint8_t avpriv_mjpeg_bits_ac_luminance[];
 148 extern av_export const uint8_t avpriv_mjpeg_val_ac_luminance[];
 149
 150 extern av_export const uint8_t avpriv_mjpeg_bits_ac_chrominance[];
 151 extern av_export const uint8_t avpriv_mjpeg_val_ac_chrominance[];
 152
 153 void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
 154                                   const uint8_t *bits_table,
 155                                   const uint8_t *val_table);
 156
 157 #endif /* AVCODEC_MJPEG_H */