## ffmpeg / libavcodec / mjpeg.h @ 5b21bdab

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1 | 6ba04c2b | Aurelien Jacobs | ```
/*
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2 | ```
* MJPEG encoder and decoder
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3 | ```
* Copyright (c) 2000, 2001 Fabrice Bellard.
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4 | ```
* Copyright (c) 2003 Alex Beregszaszi
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5 | ```
* Copyright (c) 2003-2004 Michael Niedermayer
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6 | ```
*
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7 | 7b94177e | Diego Biurrun | ```
* Support for external huffman table, various fixes (AVID workaround),
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8 | ```
* aspecting, new decode_frame mechanism and apple mjpeg-b support
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9 | ```
* by Alex Beregszaszi
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10 | ```
*
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11 | 6ba04c2b | Aurelien Jacobs | ```
* This file is part of FFmpeg.
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12 | ```
*
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13 | ```
* FFmpeg is free software; you can redistribute it and/or
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14 | ```
* modify it under the terms of the GNU Lesser General Public
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15 | ```
* License as published by the Free Software Foundation; either
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16 | ```
* version 2.1 of the License, or (at your option) any later version.
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17 | ```
*
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18 | ```
* FFmpeg is distributed in the hope that it will be useful,
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19 | ```
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 | ```
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 | ```
* Lesser General Public License for more details.
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22 | ```
*
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23 | ```
* You should have received a copy of the GNU Lesser General Public
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24 | ```
* License along with FFmpeg; if not, write to the Free Software
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25 | ```
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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26 | ```
*/
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27 | |||

28 | ```
/**
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29 | ```
* @file mjpeg.h
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30 | ```
* MJPEG encoder and decoder.
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31 | ```
*/
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32 | |||

33 | 5b21bdab | Diego Biurrun | ```
#ifndef FFMPEG_MJPEG_H
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34 | ```
#define FFMPEG_MJPEG_H
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35 | 6ba04c2b | Aurelien Jacobs | |

36 | #include "avcodec.h" |
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37 | #include "bitstream.h" |
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38 | |||

39 | |||

40 | ```
/* JPEG marker codes */
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41 | typedef enum { |
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42 | ```
/* start of frame */
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43 | SOF0 = 0xc0, /* baseline */ |
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44 | SOF1 = 0xc1, /* extended sequential, huffman */ |
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45 | SOF2 = 0xc2, /* progressive, huffman */ |
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46 | SOF3 = 0xc3, /* lossless, huffman */ |
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47 | |||

48 | SOF5 = 0xc5, /* differential sequential, huffman */ |
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49 | SOF6 = 0xc6, /* differential progressive, huffman */ |
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50 | SOF7 = 0xc7, /* differential lossless, huffman */ |
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51 | JPG = 0xc8, /* reserved for JPEG extension */ |
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52 | SOF9 = 0xc9, /* extended sequential, arithmetic */ |
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53 | SOF10 = 0xca, /* progressive, arithmetic */ |
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54 | SOF11 = 0xcb, /* lossless, arithmetic */ |
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55 | |||

56 | SOF13 = 0xcd, /* differential sequential, arithmetic */ |
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57 | SOF14 = 0xce, /* differential progressive, arithmetic */ |
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58 | SOF15 = 0xcf, /* differential lossless, arithmetic */ |
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59 | |||

60 | DHT = 0xc4, /* define huffman tables */ |
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61 | |||

62 | DAC = 0xcc, /* define arithmetic-coding conditioning */ |
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63 | |||

64 | ```
/* restart with modulo 8 count "m" */
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65 | ```
RST0 = 0xd0,
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66 | ```
RST1 = 0xd1,
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67 | ```
RST2 = 0xd2,
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68 | ```
RST3 = 0xd3,
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69 | ```
RST4 = 0xd4,
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70 | ```
RST5 = 0xd5,
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71 | ```
RST6 = 0xd6,
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72 | ```
RST7 = 0xd7,
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73 | |||

74 | SOI = 0xd8, /* start of image */ |
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75 | EOI = 0xd9, /* end of image */ |
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76 | SOS = 0xda, /* start of scan */ |
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77 | DQT = 0xdb, /* define quantization tables */ |
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78 | DNL = 0xdc, /* define number of lines */ |
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79 | DRI = 0xdd, /* define restart interval */ |
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80 | DHP = 0xde, /* define hierarchical progression */ |
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81 | EXP = 0xdf, /* expand reference components */ |
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82 | |||

83 | ```
APP0 = 0xe0,
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84 | ```
APP1 = 0xe1,
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85 | ```
APP2 = 0xe2,
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86 | ```
APP3 = 0xe3,
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87 | ```
APP4 = 0xe4,
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88 | ```
APP5 = 0xe5,
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89 | ```
APP6 = 0xe6,
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90 | ```
APP7 = 0xe7,
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91 | ```
APP8 = 0xe8,
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92 | ```
APP9 = 0xe9,
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93 | ```
APP10 = 0xea,
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94 | ```
APP11 = 0xeb,
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95 | ```
APP12 = 0xec,
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96 | ```
APP13 = 0xed,
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97 | ```
APP14 = 0xee,
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98 | ```
APP15 = 0xef,
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99 | |||

100 | ```
JPG0 = 0xf0,
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101 | ```
JPG1 = 0xf1,
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102 | ```
JPG2 = 0xf2,
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103 | ```
JPG3 = 0xf3,
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104 | ```
JPG4 = 0xf4,
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105 | ```
JPG5 = 0xf5,
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106 | ```
JPG6 = 0xf6,
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107 | SOF48 = 0xf7, ///< JPEG-LS |
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108 | LSE = 0xf8, ///< JPEG-LS extension parameters |
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109 | ```
JPG9 = 0xf9,
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110 | ```
JPG10 = 0xfa,
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111 | ```
JPG11 = 0xfb,
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112 | ```
JPG12 = 0xfc,
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113 | ```
JPG13 = 0xfd,
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114 | |||

115 | COM = 0xfe, /* comment */ |
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116 | |||

117 | TEM = 0x01, /* temporary private use for arithmetic coding */ |
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118 | |||

119 | ```
/* 0x02 -> 0xbf reserved */
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120 | } JPEG_MARKER; |
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121 | |||

122 | static inline void put_marker(PutBitContext *p, int code) |
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123 | { |
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124 | put_bits(p, 8, 0xff); |
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125 | ```
put_bits(p, 8, code);
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126 | } |
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127 | |||

128 | 4922a5b0 | Aurelien Jacobs | ```
#define PREDICT(ret, topleft, top, left, predictor)\
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129 | ```
switch(predictor){\
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130 | case 1: ret= left; break;\ |
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131 | case 2: ret= top; break;\ |
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132 | case 3: ret= topleft; break;\ |
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133 | case 4: ret= left + top - topleft; break;\ |
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134 | case 5: ret= left + ((top - topleft)>>1); break;\ |
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135 | case 6: ret= top + ((left - topleft)>>1); break;\ |
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136 | ```
default:\
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137 | case 7: ret= (left + top)>>1; break;\ |
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138 | } |
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139 | |||

140 | 944721c1 | Aurelien Jacobs | extern const uint8_t ff_mjpeg_bits_dc_luminance[]; |

141 | extern const uint8_t ff_mjpeg_val_dc_luminance[]; |
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142 | 4922a5b0 | Aurelien Jacobs | |

143 | 944721c1 | Aurelien Jacobs | extern const uint8_t ff_mjpeg_bits_dc_chrominance[]; |

144 | extern const uint8_t ff_mjpeg_val_dc_chrominance[]; |
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145 | 4922a5b0 | Aurelien Jacobs | |

146 | 944721c1 | Aurelien Jacobs | extern const uint8_t ff_mjpeg_bits_ac_luminance[]; |

147 | extern const uint8_t ff_mjpeg_val_ac_luminance[]; |
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148 | 4922a5b0 | Aurelien Jacobs | |

149 | 944721c1 | Aurelien Jacobs | extern const uint8_t ff_mjpeg_bits_ac_chrominance[]; |

150 | extern const uint8_t ff_mjpeg_val_ac_chrominance[]; |
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151 | 4922a5b0 | Aurelien Jacobs | |

152 | 944721c1 | Aurelien Jacobs | ```
void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
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153 | ```
const uint8_t *bits_table,
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154 | ```
const uint8_t *val_table);
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155 | 4922a5b0 | Aurelien Jacobs | |

156 | 5b21bdab | Diego Biurrun | #endif /* FFMPEG_MJPEG_H */ |