wxWidgets/contrib/include/wx/mmedia/sndmsad.h

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// --------------------------------------------------------------------------
// Name: sndmsad(pcm).h
// Purpose: MS ADPCM codec
// Date: 25/02/2000
// Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 2000
// CVSID: $Id$
// --------------------------------------------------------------------------
#ifndef _WX_SNDMSAD_H
#define _WX_SNDMSAD_H
#ifdef __GNUG__
#pragma interface "sndmsad.h"
#endif
#include "wx/defs.h"
#include "wx/dynarray.h"
#include "wx/mmedia/sndcodec.h"
#include "wx/mmedia/sndbase.h"
WX_DEFINE_EXPORTED_ARRAY(wxInt16, wxMSAdpcmCoeffs);
//
// MSADPCM format
//
class WXDLLEXPORT wxSoundFormatMSAdpcm: public wxSoundFormatBase {
public:
wxSoundFormatMSAdpcm();
~wxSoundFormatMSAdpcm();
void SetSampleRate(wxUint32 srate);
wxUint32 GetSampleRate() const;
void SetCoefs(wxInt16 **coefs, wxUint16 ncoefs, wxUint16 coefs_len);
void GetCoefs(wxInt16 **&coefs, wxUint16& ncoefs,
wxUint16& coefs_len) const;
void SetBlockSize(wxUint16 block_size);
wxUint16 GetBlockSize() const;
void SetChannels(wxUint16 channels);
wxUint16 GetChannels() const;
wxSoundFormatType GetType() const { return wxSOUND_MSADPCM; }
wxSoundFormatBase *Clone() const;
wxUint32 GetTimeFromBytes(wxUint32 bytes) const;
wxUint32 GetBytesFromTime(wxUint32 time) const;
bool operator !=(const wxSoundFormatBase& frmt2) const;
protected:
wxUint32 m_srate, m_nchannels;
wxInt16 **m_coefs;
wxUint16 m_ncoefs, m_coefs_len;
wxUint16 m_block_size;
};
//
// MS ADPCM converter class
//
class WXDLLEXPORT wxSoundRouterStream;
class WXDLLEXPORT wxSoundStreamMSAdpcm: public wxSoundStreamCodec {
public:
wxSoundStreamMSAdpcm(wxSoundStream& sndio);
~wxSoundStreamMSAdpcm();
wxSoundStream& Read(void *buffer, wxUint32 len);
wxSoundStream& Write(const void *buffer, wxUint32 len);
bool SetSoundFormat(const wxSoundFormatBase& format);
wxUint32 GetBestSize() const;
protected:
wxSoundRouterStream *m_router;
typedef struct {
wxInt32 predictor;
wxInt16 samp1;
wxInt16 samp2;
wxInt16 coeff[2];
wxInt32 iDelta;
} AdpcmState;
AdpcmState m_state[1];
bool m_got_header;
bool m_stereo;
wxInt16 **m_coefs;
wxUint16 m_block_size;
wxUint16 m_ncoefs;
wxUint16 m_next_block;
protected:
wxUint32 DecodeMonoADPCM(const void *in_buffer, void *out_buffer,
wxUint32 in_len);
wxUint32 DecodeStereoADPCM(const void *in_buffer, void *out_buffer,
wxUint32 in_len);
void Nibble(wxInt8 nyb,
AdpcmState *state,
wxInt16 **out_buffer);
};
#endif