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