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/* JPEG marker codes */ 37enum JpegMarker { 38 /* start of frame */ 39 SOF0 = 0xc0, /* baseline */ 40 SOF1 = 0xc1, /* extended sequential, huffman */ 41 SOF2 = 0xc2, /* progressive, huffman */ 42 SOF3 = 0xc3, /* lossless, huffman */ 43 44 SOF5 = 0xc5, /* differential sequential, huffman */ 45 SOF6 = 0xc6, /* differential progressive, huffman */ 46 SOF7 = 0xc7, /* differential lossless, huffman */ 47 JPG = 0xc8, /* reserved for JPEG extension */ 48 SOF9 = 0xc9, /* extended sequential, arithmetic */ 49 SOF10 = 0xca, /* progressive, arithmetic */ 50 SOF11 = 0xcb, /* lossless, arithmetic */ 51 52 SOF13 = 0xcd, /* differential sequential, arithmetic */ 53 SOF14 = 0xce, /* differential progressive, arithmetic */ 54 SOF15 = 0xcf, /* differential lossless, arithmetic */ 55 56 DHT = 0xc4, /* define huffman tables */ 57 58 DAC = 0xcc, /* define arithmetic-coding conditioning */ 59 60 /* restart with modulo 8 count "m" */ 61 RST0 = 0xd0, 62 RST1 = 0xd1, 63 RST2 = 0xd2, 64 RST3 = 0xd3, 65 RST4 = 0xd4, 66 RST5 = 0xd5, 67 RST6 = 0xd6, 68 RST7 = 0xd7, 69 70 SOI = 0xd8, /* start of image */ 71 EOI = 0xd9, /* end of image */ 72 SOS = 0xda, /* start of scan */ 73 DQT = 0xdb, /* define quantization tables */ 74 DNL = 0xdc, /* define number of lines */ 75 DRI = 0xdd, /* define restart interval */ 76 DHP = 0xde, /* define hierarchical progression */ 77 EXP = 0xdf, /* expand reference components */ 78 79 APP0 = 0xe0, 80 APP1 = 0xe1, 81 APP2 = 0xe2, 82 APP3 = 0xe3, 83 APP4 = 0xe4, 84 APP5 = 0xe5, 85 APP6 = 0xe6, 86 APP7 = 0xe7, 87 APP8 = 0xe8, 88 APP9 = 0xe9, 89 APP10 = 0xea, 90 APP11 = 0xeb, 91 APP12 = 0xec, 92 APP13 = 0xed, 93 APP14 = 0xee, 94 APP15 = 0xef, 95 96 JPG0 = 0xf0, 97 JPG1 = 0xf1, 98 JPG2 = 0xf2, 99 JPG3 = 0xf3, 100 JPG4 = 0xf4, 101 JPG5 = 0xf5, 102 JPG6 = 0xf6, 103 SOF48 = 0xf7, ///< JPEG-LS 104 LSE = 0xf8, ///< JPEG-LS extension parameters 105 JPG9 = 0xf9, 106 JPG10 = 0xfa, 107 JPG11 = 0xfb, 108 JPG12 = 0xfc, 109 JPG13 = 0xfd, 110 111 COM = 0xfe, /* comment */ 112 113 TEM = 0x01, /* temporary private use for arithmetic coding */ 114 115 /* 0x02 -> 0xbf reserved */ 116}; 117 118#define PREDICT(ret, topleft, top, left, predictor)\ 119 switch(predictor){\ 120 case 0: ret= 0; break;\ 121 case 1: ret= left; break;\ 122 case 2: ret= top; break;\ 123 case 3: ret= topleft; break;\ 124 case 4: ret= left + top - topleft; break;\ 125 case 5: ret= left + ((top - topleft)>>1); break;\ 126 case 6: ret= top + ((left - topleft)>>1); break;\ 127 default:\ 128 case 7: ret= (left + top)>>1; break;\ 129 } 130 131#endif /* AVCODEC_MJPEG_H */ 132