AuFile.h

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00001 /*
00002  * steghide 0.5.1 - a steganography program
00003  * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
00004  *
00005  * This program is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU General Public License
00007  * as published by the Free Software Foundation; either version 2
00008  * of the License, or (at your option) any later version.
00009  *
00010  * This program is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * GNU General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU General Public License
00016  * along with this program; if not, write to the Free Software
00017  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00018  *
00019  */
00020 
00021 #ifndef SH_AUFILE_H
00022 #define SH_AUFILE_H
00023 
00024 #include <vector>
00025 
00026 #include "AudioData.h"
00027 #include "CvrStgFile.h"
00028 
00029 class BinaryIO ;
00030 
00035 class AuFile : public CvrStgFile {
00036         public:
00037         AuFile (BinaryIO *io) ;
00038         ~AuFile (void) ;
00039 
00040         void read (BinaryIO *io) ;
00041         void write (void) ;
00042 
00043         std::list<CvrStgFile::Property> getProperties (void) const ;
00044         std::vector<MatchingAlgorithm*> getMatchingAlgorithms (Graph* g, Matching* m) const ;
00045 
00046         unsigned long getNumSamples (void) const
00047                 { return Data->getNumSamples() ; } ;
00048 
00049         void replaceSample (const SamplePos pos, const SampleValue* s)
00050                 { return Data->replaceSample(pos, s) ; } ;
00051 
00052         SampleValue* getSampleValue (SamplePos pos) const
00053                 { return Data->getSampleValue(pos) ; } ;
00054 
00055         private:
00056         enum ENCODING { MULAW8 = 1, PCM8 = 2, PCM16 = 3 } ;
00057         class AuHeader {
00058                 public:
00059                 char            id[4] ;
00060                 UWORD32         offset ;
00061                 UWORD32         size ;
00062                 ENCODING        encoding ;
00063                 UWORD32         samplerate ;
00064                 UWORD32         channels ;
00065 
00066                 static const UWORD32 SizeUnknown = 0xFFFFFFFF ;
00067                 static const unsigned short HeaderSize = 24 ;
00068 
00069                 unsigned short getBytesPerSample (void) const ;
00070         } ;
00071 
00072         static const UWORD32 Radius_MuLaw8 = 1 ;
00073         static const UWORD32 Radius_PCM8 = 1 ;
00074         static const UWORD32 Radius_PCM16 = 20 ;
00075         static const unsigned short SamplesPerVertex = 2 ;
00076         static const EmbValue EmbValueModulus = 2 ;
00077 
00078         AuHeader Header ;
00079         std::vector<BYTE> Infofield ;
00080         AudioData* Data ;
00081 } ;
00082 
00083 #endif /* ndef SH_AUFILE_H */

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