jamulus/src/audiocompr.h
2007-12-31 13:09:12 +00:00

111 lines
3.9 KiB
C++
Executable file

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