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