WavFile.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_WAVFILE_H
00022 #define SH_WAVFILE_H
00023 
00024 #include <vector>
00025 
00026 #include "CvrStgFile.h"
00027 
00028 class BinaryIO ;
00029 class WavChunkHeader ;
00030 class WavChunkUnused ;
00031 class WavFormatChunk ;
00032 
00033 class WavFile : public CvrStgFile {
00034         public:
00035         WavFile (void) ;
00036         WavFile (BinaryIO *io) ;
00037         ~WavFile (void) ;
00038 
00039         void read (BinaryIO *io) ;
00040         void write (void) ;
00041 
00042         std::list<CvrStgFile::Property> getProperties (void) const ;
00043 
00044         unsigned long getNumSamples (void) const ;
00045         void replaceSample (const SamplePos pos, const SampleValue* s) ;
00046         SampleValue* getSampleValue (SamplePos pos) const ;
00047 
00048         std::vector<SampleValueAdjacencyList*> calcSVAdjacencyLists (const std::vector<SampleValue*>& svs) const ;
00049         std::vector<MatchingAlgorithm*> getMatchingAlgorithms (Graph* g, Matching* m) const ;
00050 
00051         unsigned short getBitsPerSample (void) const ;
00052 
00053         private:
00054         static const signed short       FormatPCM = 1 ;
00055 
00056         static const unsigned short SamplesPerVertex = 2 ;
00057         static const UWORD32 Radius_small = 1 ;
00058         static const UWORD32 Radius_large = 20 ;
00059         static const EmbValue EmbValueModulus = 2 ;
00060 
00061         WavChunkHeader *riffchhdr ;
00062         char id_wave[4] ;
00063 
00064         WavFormatChunk *FormatChunk ;
00065 
00066         WavChunkHeader *datachhdr ;
00068         std::vector<unsigned char> data_small ;
00070         std::vector<int> data_large ;   // it is assumed that an int can hold 32 bits
00071         
00072         std::vector<WavChunkUnused*> UnusedBeforeData ;
00073         std::vector<BYTE> UnusedAfterData ;
00074 
00075         void readheaders (void) ;
00076         void readdata (void) ;
00077         void writeheaders (void) ;
00078         void writedata (void) ;
00079         void calcpos (SamplePos n, unsigned long *bytepos, unsigned short *firstbitpos) const ;
00084         unsigned short getFirstBitPosinSample (void) ;
00085         unsigned short getBytesPerSample (void) ;
00086 } ;
00087 
00088 #endif // ndef SH_WAVFILE_H

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