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#ifndef _ADPCMCODEC_H_
#define _ADPCMCODEC_H_
//
// File : adpcmcodec.h
// Creation date : Wed Aug 22 19:12:46 2001 GMT by Szymon Stefanek
//
// This file is part of the KVirc irc client distribution
// Code derived from adpcm.c : Intel ADPCM coder/decoder
// Adapted for the KVirc distribution by Szymon Stefanek (pragma at kvirc dot net)
// Last revision : 22 Aug 2001
// See kvi_adpcm.cpp for the complete copyright notice.
//
//
// adpcm.h - include file for adpcm coder.
//
// Version 1.0, 7-Jul-92.
//
//
// Average compression speed experiment: P166MMX 32MEG
//
// INPUT | OUTPUT | COMPRESSION TIME
// ------------------------------------------------------------------------
// shorts bytes | bytes | min msec. avrg. high peak (1 time)
// ------------------------------------------------------------------------
// 512 1024 | 256 | ~4 4 34
// 1024 2048 | 512 | ~7 8 75
// 2048 4096 | 1024 | ~13 15 175 (!!!)
// 4096 8192 | 2048 | ~26 33 91
// 8192 16384 | 4096 | ~57 80 220 (~1 sec of audio)
// 16384 32768 | 8192 | ~110 250 290
//
#include <qstring.h> // fix for qtextstream.h
#include "codec.h"
typedef struct adpcm_state
{
short valprev; /* Previous output value */
char index; /* Index into stepsize table */
} ADPCM_state;
class KviDccVoiceAdpcmCodec : public KviDccVoiceCodec
{
public:
KviDccVoiceAdpcmCodec();
virtual ~KviDccVoiceAdpcmCodec();
private:
ADPCM_state * m_pEncodeState;
ADPCM_state * m_pDecodeState;
public:
virtual void encode(KviDataBuffer * signal,KviDataBuffer * stream);
virtual void decode(KviDataBuffer * stream,KviDataBuffer * signal);
virtual int encodedFrameSize();
virtual int decodedFrameSize();
};
#endif //_ADPCMCODEC_H_
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