utils/wxMMedia2/lib/sndg72x.h

   1 // --------------------------------------------------------------------------
   2 // Name: sndg72x.h
   3 // Purpose:
   4 // Date: 08/26/1999
   5 // Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999
   6 // CVSID: $Id$
   7 // --------------------------------------------------------------------------
   8 #ifndef _WX_SNDG72X_H
   9 #define _WX_SNDG72X_H
  10
  11 #ifdef __GNUG__
  12 #pragma interface "sndg72x.h"
  13 #endif
  14
  15 #include <stddef.h>
  16 #include "sndcodec.h"
  17 #include "sndbase.h"
  18
  19 typedef enum {
  20   wxSOUND_G721,
  21   wxSOUND_G723_24,
  22   wxSOUND_G723_40
  23 } wxSoundG72XType;
  24
  25 // This fixes a bug in Mingw95
  26 typedef struct g72x_state g72state;
  27
  28 //
  29 // G72X format
  30 //
  31 class WXDLLEXPORT wxSoundFormatG72X: public wxSoundFormatBase {
  32  public:
  33   wxSoundFormatG72X();
  34   ~wxSoundFormatG72X();
  35
  36   void SetG72XType(wxSoundG72XType type);
  37   wxSoundG72XType GetG72XType() const { return m_g72x_type; }
  38
  39   void SetSampleRate(wxUint32 srate);
  40   wxUint32 GetSampleRate() const;
  41
  42   wxSoundFormatType GetType() const { return wxSOUND_G72X; }
  43   wxSoundFormatBase *Clone() const;
  44
  45   wxUint32 GetTimeFromBytes(wxUint32 bytes) const;
  46   wxUint32 GetBytesFromTime(wxUint32 time) const;
  47
  48   bool operator !=(const wxSoundFormatBase& frmt2) const;
  49
  50  protected:
  51   wxUint32 m_srate;
  52   wxSoundG72XType m_g72x_type;
  53 };
  54
  55 //
  56 // ULAW converter class
  57 //
  58
  59 class WXDLLEXPORT wxSoundRouterStream;
  60 class WXDLLEXPORT wxSoundStreamG72X: public wxSoundStreamCodec {
  61  public:
  62   wxSoundStreamG72X(wxSoundStream& sndio);
  63   ~wxSoundStreamG72X();
  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  protected:
  71   wxSoundRouterStream *m_router;
  72   wxUint8 m_n_bits, m_current_mask, m_current_b_pos, m_current_byte;
  73   wxUint8 *m_io_buffer;
  74   g72state *m_state;
  75
  76   int (*m_coder)(int code, int in_code, struct g72x_state *state);
  77   int (*m_decoder)(int code, int out_code, struct g72x_state *state);
  78
  79  protected:
  80   void PutBits(wxUint8 bits);
  81   wxUint8 GetBits();
  82 };
  83
  84 #endif