111 lines
3.5 KiB
C++
Executable File
111 lines
3.5 KiB
C++
Executable File
/******************************************************************************\
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* Copyright (c) 2004-2006
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*
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* Author(s):
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* Volker Fischer, Erik de Castro Lopo
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*
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******************************************************************************
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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\******************************************************************************/
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#if !defined(AUDIOCOMPR_H_OIHGE76GEKJH3249_GEG98EG3_43441912__INCLUDED_)
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#define AUDIOCOMPR_H_OIHGE76GEKJH3249_GEG98EG3_43441912__INCLUDED_
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#include "util.h"
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#include "global.h"
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#include "buffer.h"
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/* Definitions ****************************************************************/
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/* tables */
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static int ima_indx_adjust[16] =
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{ -1, -1, -1, -1, /* +0 - +3, decrease the step size */
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2, 4, 6, 8, /* +4 - +7, increase the step size */
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-1, -1, -1, -1, /* -0 - -3, decrease the step size */
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2, 4, 6, 8, /* -4 - -7, increase the step size */
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};
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#define IMA_STEP_SIZE_TAB_LEN 89
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static int ima_step_size[IMA_STEP_SIZE_TAB_LEN] =
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{ 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
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50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173, 190, 209, 230,
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253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658, 724, 796, 876, 963,
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1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327,
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3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630, 9493, 10442,
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11487, 12635, 13899, 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794,
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32767
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};
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/* Classes ********************************************************************/
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/* IMA-ADPCM ---------------------------------------------------------------- */
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class CImaAdpcm
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{
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public:
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CImaAdpcm() : iStepindEnc ( 0 ) {}
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virtual ~CImaAdpcm() {}
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int Init ( const int iNewAudioLen );
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CVector<unsigned char> Encode ( const CVector<short>& vecsAudio );
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CVector<short> Decode ( const CVector<unsigned char>& vecbyAdpcm );
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protected:
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int iAudSize;
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int iAdpcmSize;
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int iStepindEnc;
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/* inline functions must be declared in the header */
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inline int CheckBounds ( const int iData, const int iMin, const int iMax )
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{
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if ( iData > iMax )
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{
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return iMax;
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}
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if ( iData < iMin )
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{
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return iMin;
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}
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return iData;
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}
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};
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/* Audio compression class -------------------------------------------------- */
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class CAudioCompression
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{
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public:
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enum EAudComprType { CT_NONE, CT_IMAADPCM };
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CAudioCompression() {}
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virtual ~CAudioCompression() {}
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int Init ( const int iNewAudioLen,
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const EAudComprType eNewAuCoTy );
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CVector<unsigned char> Encode ( const CVector<short>& vecsAudio );
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CVector<short> Decode ( const CVector<unsigned char>& vecbyAdpcm );
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protected:
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EAudComprType eAudComprType;
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CImaAdpcm ImaAdpcm;
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int iCodeSize;
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};
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#endif /* !defined(AUDIOCOMPR_H_OIHGE76GEKJH3249_GEG98EG3_43441912__INCLUDED_) */
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