contrib/include/wx/mmedia/sndmsad.h

   1 // --------------------------------------------------------------------------
   2 // Name: sndmsad(pcm).h
   3 // Purpose: MS ADPCM codec
   4 // Date: 25/02/2000
   5 // Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 2000
   6 // CVSID: $Id$
   7 // --------------------------------------------------------------------------
   8 #ifndef _WX_SNDMSAD_H
   9 #define _WX_SNDMSAD_H
  10
  11 #ifdef __GNUG__
  12 #pragma interface "sndmsad.h"
  13 #endif
  14
  15 #include "wx/defs.h"
  16 #include "wx/dynarray.h"
  17 #include "wx/mmedia/defs.h"
  18 #include "wx/mmedia/sndcodec.h"
  19 #include "wx/mmedia/sndbase.h"
  20
  21 WX_DEFINE_EXPORTED_ARRAY_INT(wxInt16, wxMSAdpcmCoeffs);
  22
  23 //
  24 // MSADPCM format
  25 //
  26 class WXDLLIMPEXP_MMEDIA wxSoundFormatMSAdpcm: public wxSoundFormatBase {
  27 public:
  28     wxSoundFormatMSAdpcm();
  29     ~wxSoundFormatMSAdpcm();
  30
  31     void SetSampleRate(wxUint32 srate);
  32     wxUint32 GetSampleRate() const;
  33
  34     void SetCoefs(wxInt16 **coefs, wxUint16 ncoefs, wxUint16 coefs_len);
  35     void GetCoefs(wxInt16 **&coefs, wxUint16& ncoefs,
  36                   wxUint16& coefs_len) const;
  37
  38     void SetBlockSize(wxUint16 block_size);
  39     wxUint16 GetBlockSize() const;
  40
  41     void SetChannels(wxUint16 channels);
  42     wxUint16 GetChannels() const;
  43
  44     wxSoundFormatType GetType() const { return wxSOUND_MSADPCM; }
  45     wxSoundFormatBase *Clone() const;
  46
  47     wxUint32 GetTimeFromBytes(wxUint32 bytes) const;
  48     wxUint32 GetBytesFromTime(wxUint32 time) const;
  49
  50     bool operator !=(const wxSoundFormatBase& frmt2) const;
  51
  52 protected:
  53     wxUint32 m_srate, m_nchannels;
  54     wxInt16 **m_coefs;
  55     wxUint16 m_ncoefs, m_coefs_len;
  56     wxUint16 m_block_size;
  57 };
  58
  59 //
  60 // MS ADPCM converter class
  61 //
  62 class WXDLLIMPEXP_MMEDIA wxSoundRouterStream;
  63 class WXDLLIMPEXP_MMEDIA wxSoundStreamMSAdpcm: public wxSoundStreamCodec {
  64 public:
  65     wxSoundStreamMSAdpcm(wxSoundStream& sndio);
  66     ~wxSoundStreamMSAdpcm();
  67
  68     wxSoundStream& Read(void *buffer, wxUint32 len);
  69     wxSoundStream& Write(const void *buffer, wxUint32 len);
  70
  71     bool SetSoundFormat(const wxSoundFormatBase& format);
  72
  73     wxUint32 GetBestSize() const;
  74
  75 protected:
  76     wxSoundRouterStream *m_router;
  77
  78     typedef struct {
  79         wxInt32 predictor;
  80         wxInt16 samp1;
  81         wxInt16 samp2;
  82         wxInt16 coeff[2];
  83         wxInt32 iDelta;
  84     } AdpcmState;
  85
  86     AdpcmState m_state[1];
  87
  88     bool     m_got_header;
  89     bool     m_stereo;
  90     wxInt16  **m_coefs;
  91     wxUint16 m_block_size;
  92     wxUint16 m_ncoefs;
  93     wxUint16 m_next_block;
  94
  95 protected:
  96     wxUint32 DecodeMonoADPCM(const void *in_buffer, void *out_buffer,
  97                              wxUint32 in_len);
  98     wxUint32 DecodeStereoADPCM(const void *in_buffer, void *out_buffer,
  99                                wxUint32 in_len);
 100     void Nibble(wxInt8 nyb,
 101                 AdpcmState *state,
 102                 wxInt16 **out_buffer);
 103 };
 104
 105 #endif