Libav
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00001 /* 00002 * MJPEG encoder and decoder 00003 * Copyright (c) 2000, 2001 Fabrice Bellard 00004 * Copyright (c) 2003 Alex Beregszaszi 00005 * Copyright (c) 2003-2004 Michael Niedermayer 00006 * 00007 * Support for external huffman table, various fixes (AVID workaround), 00008 * aspecting, new decode_frame mechanism and apple mjpeg-b support 00009 * by Alex Beregszaszi 00010 * 00011 * This file is part of FFmpeg. 00012 * 00013 * FFmpeg is free software; you can redistribute it and/or 00014 * modify it under the terms of the GNU Lesser General Public 00015 * License as published by the Free Software Foundation; either 00016 * version 2.1 of the License, or (at your option) any later version. 00017 * 00018 * FFmpeg is distributed in the hope that it will be useful, 00019 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00020 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00021 * Lesser General Public License for more details. 00022 * 00023 * You should have received a copy of the GNU Lesser General Public 00024 * License along with FFmpeg; if not, write to the Free Software 00025 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00026 */ 00027 00033 #ifndef AVCODEC_MJPEG_H 00034 #define AVCODEC_MJPEG_H 00035 00036 #include "avcodec.h" 00037 #include "put_bits.h" 00038 00039 00040 /* JPEG marker codes */ 00041 typedef enum { 00042 /* start of frame */ 00043 SOF0 = 0xc0, /* baseline */ 00044 SOF1 = 0xc1, /* extended sequential, huffman */ 00045 SOF2 = 0xc2, /* progressive, huffman */ 00046 SOF3 = 0xc3, /* lossless, huffman */ 00047 00048 SOF5 = 0xc5, /* differential sequential, huffman */ 00049 SOF6 = 0xc6, /* differential progressive, huffman */ 00050 SOF7 = 0xc7, /* differential lossless, huffman */ 00051 JPG = 0xc8, /* reserved for JPEG extension */ 00052 SOF9 = 0xc9, /* extended sequential, arithmetic */ 00053 SOF10 = 0xca, /* progressive, arithmetic */ 00054 SOF11 = 0xcb, /* lossless, arithmetic */ 00055 00056 SOF13 = 0xcd, /* differential sequential, arithmetic */ 00057 SOF14 = 0xce, /* differential progressive, arithmetic */ 00058 SOF15 = 0xcf, /* differential lossless, arithmetic */ 00059 00060 DHT = 0xc4, /* define huffman tables */ 00061 00062 DAC = 0xcc, /* define arithmetic-coding conditioning */ 00063 00064 /* restart with modulo 8 count "m" */ 00065 RST0 = 0xd0, 00066 RST1 = 0xd1, 00067 RST2 = 0xd2, 00068 RST3 = 0xd3, 00069 RST4 = 0xd4, 00070 RST5 = 0xd5, 00071 RST6 = 0xd6, 00072 RST7 = 0xd7, 00073 00074 SOI = 0xd8, /* start of image */ 00075 EOI = 0xd9, /* end of image */ 00076 SOS = 0xda, /* start of scan */ 00077 DQT = 0xdb, /* define quantization tables */ 00078 DNL = 0xdc, /* define number of lines */ 00079 DRI = 0xdd, /* define restart interval */ 00080 DHP = 0xde, /* define hierarchical progression */ 00081 EXP = 0xdf, /* expand reference components */ 00082 00083 APP0 = 0xe0, 00084 APP1 = 0xe1, 00085 APP2 = 0xe2, 00086 APP3 = 0xe3, 00087 APP4 = 0xe4, 00088 APP5 = 0xe5, 00089 APP6 = 0xe6, 00090 APP7 = 0xe7, 00091 APP8 = 0xe8, 00092 APP9 = 0xe9, 00093 APP10 = 0xea, 00094 APP11 = 0xeb, 00095 APP12 = 0xec, 00096 APP13 = 0xed, 00097 APP14 = 0xee, 00098 APP15 = 0xef, 00099 00100 JPG0 = 0xf0, 00101 JPG1 = 0xf1, 00102 JPG2 = 0xf2, 00103 JPG3 = 0xf3, 00104 JPG4 = 0xf4, 00105 JPG5 = 0xf5, 00106 JPG6 = 0xf6, 00107 SOF48 = 0xf7, 00108 LSE = 0xf8, 00109 JPG9 = 0xf9, 00110 JPG10 = 0xfa, 00111 JPG11 = 0xfb, 00112 JPG12 = 0xfc, 00113 JPG13 = 0xfd, 00114 00115 COM = 0xfe, /* comment */ 00116 00117 TEM = 0x01, /* temporary private use for arithmetic coding */ 00118 00119 /* 0x02 -> 0xbf reserved */ 00120 } JPEG_MARKER; 00121 00122 static inline void put_marker(PutBitContext *p, int code) 00123 { 00124 put_bits(p, 8, 0xff); 00125 put_bits(p, 8, code); 00126 } 00127 00128 #define PREDICT(ret, topleft, top, left, predictor)\ 00129 switch(predictor){\ 00130 case 1: ret= left; break;\ 00131 case 2: ret= top; break;\ 00132 case 3: ret= topleft; break;\ 00133 case 4: ret= left + top - topleft; break;\ 00134 case 5: ret= left + ((top - topleft)>>1); break;\ 00135 case 6: ret= top + ((left - topleft)>>1); break;\ 00136 default:\ 00137 case 7: ret= (left + top)>>1; break;\ 00138 } 00139 00140 extern const uint8_t ff_mjpeg_bits_dc_luminance[]; 00141 extern const uint8_t ff_mjpeg_val_dc[]; 00142 00143 extern const uint8_t ff_mjpeg_bits_dc_chrominance[]; 00144 00145 extern const uint8_t ff_mjpeg_bits_ac_luminance[]; 00146 extern const uint8_t ff_mjpeg_val_ac_luminance[]; 00147 00148 extern const uint8_t ff_mjpeg_bits_ac_chrominance[]; 00149 extern const uint8_t ff_mjpeg_val_ac_chrominance[]; 00150 00151 void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, 00152 const uint8_t *bits_table, 00153 const uint8_t *val_table); 00154 00155 #endif /* AVCODEC_MJPEG_H */