| 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 */ |