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