132 lines
4 KiB
C
132 lines
4 KiB
C
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/*
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* MJPEG encoder and decoder
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2003 Alex Beregszaszi
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* Copyright (c) 2003-2004 Michael Niedermayer
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*
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* Support for external huffman table, various fixes (AVID workaround),
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* aspecting, new decode_frame mechanism and apple mjpeg-b support
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* by Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MJPEG encoder and decoder.
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*/
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#ifndef AVCODEC_MJPEG_H
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#define AVCODEC_MJPEG_H
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/* JPEG marker codes */
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enum JpegMarker {
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/* start of frame */
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SOF0 = 0xc0, /* baseline */
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SOF1 = 0xc1, /* extended sequential, huffman */
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SOF2 = 0xc2, /* progressive, huffman */
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SOF3 = 0xc3, /* lossless, huffman */
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SOF5 = 0xc5, /* differential sequential, huffman */
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SOF6 = 0xc6, /* differential progressive, huffman */
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SOF7 = 0xc7, /* differential lossless, huffman */
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JPG = 0xc8, /* reserved for JPEG extension */
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SOF9 = 0xc9, /* extended sequential, arithmetic */
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SOF10 = 0xca, /* progressive, arithmetic */
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SOF11 = 0xcb, /* lossless, arithmetic */
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SOF13 = 0xcd, /* differential sequential, arithmetic */
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SOF14 = 0xce, /* differential progressive, arithmetic */
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SOF15 = 0xcf, /* differential lossless, arithmetic */
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DHT = 0xc4, /* define huffman tables */
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DAC = 0xcc, /* define arithmetic-coding conditioning */
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/* restart with modulo 8 count "m" */
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RST0 = 0xd0,
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RST1 = 0xd1,
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RST2 = 0xd2,
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RST3 = 0xd3,
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RST4 = 0xd4,
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RST5 = 0xd5,
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RST6 = 0xd6,
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RST7 = 0xd7,
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SOI = 0xd8, /* start of image */
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EOI = 0xd9, /* end of image */
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SOS = 0xda, /* start of scan */
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DQT = 0xdb, /* define quantization tables */
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DNL = 0xdc, /* define number of lines */
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DRI = 0xdd, /* define restart interval */
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DHP = 0xde, /* define hierarchical progression */
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EXP = 0xdf, /* expand reference components */
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APP0 = 0xe0,
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APP1 = 0xe1,
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APP2 = 0xe2,
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APP3 = 0xe3,
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APP4 = 0xe4,
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APP5 = 0xe5,
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APP6 = 0xe6,
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APP7 = 0xe7,
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APP8 = 0xe8,
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APP9 = 0xe9,
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APP10 = 0xea,
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APP11 = 0xeb,
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APP12 = 0xec,
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APP13 = 0xed,
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APP14 = 0xee,
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APP15 = 0xef,
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JPG0 = 0xf0,
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JPG1 = 0xf1,
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JPG2 = 0xf2,
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JPG3 = 0xf3,
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JPG4 = 0xf4,
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JPG5 = 0xf5,
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JPG6 = 0xf6,
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SOF48 = 0xf7, ///< JPEG-LS
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LSE = 0xf8, ///< JPEG-LS extension parameters
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JPG9 = 0xf9,
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JPG10 = 0xfa,
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JPG11 = 0xfb,
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JPG12 = 0xfc,
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JPG13 = 0xfd,
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COM = 0xfe, /* comment */
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TEM = 0x01, /* temporary private use for arithmetic coding */
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/* 0x02 -> 0xbf reserved */
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};
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#define PREDICT(ret, topleft, top, left, predictor)\
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switch(predictor){\
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case 0: ret= 0; break;\
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case 1: ret= left; break;\
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case 2: ret= top; break;\
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case 3: ret= topleft; break;\
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case 4: ret= left + top - topleft; break;\
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case 5: ret= left + ((top - topleft)>>1); break;\
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case 6: ret= top + ((left - topleft)>>1); break;\
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default:\
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case 7: ret= (left + top)>>1; break;\
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}
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#endif /* AVCODEC_MJPEG_H */
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