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