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 //
  26 // G72X format
  27 //
  28 class WXDLLEXPORT wxSoundFormatG72X: public wxSoundFormatBase {
  29  public:
  30   wxSoundFormatG72X();
  31   ~wxSoundFormatG72X();
  32
  33   void SetG72XType(wxSoundG72XType type);
  34   wxSoundG72XType GetG72XType() const { return m_g72x_type; }
  35
  36   void SetSampleRate(wxUint32 srate);
  37   wxUint32 GetSampleRate() const;
  38
  39   wxSoundFormatType GetType() const { return wxSOUND_G72X; }
  40   wxSoundFormatBase *Clone() const;
  41
  42   wxUint32 GetTimeFromBytes(wxUint32 bytes) const;
  43   wxUint32 GetBytesFromTime(wxUint32 time) const;
  44
  45   bool operator !=(const wxSoundFormatBase& frmt2) const;
  46
  47  protected:
  48   wxUint32 m_srate;
  49   wxSoundG72XType m_g72x_type;
  50 };
  51
  52 //
  53 // ULAW converter class
  54 //
  55
  56 class WXDLLEXPORT wxSoundRouterStream;
  57 class WXDLLEXPORT wxSoundStreamG72X: public wxSoundStreamCodec {
  58  public:
  59   wxSoundStreamG72X(wxSoundStream& sndio);
  60   ~wxSoundStreamG72X();
  61
  62   wxSoundStream& Read(void *buffer, wxUint32 len);
  63   wxSoundStream& Write(const void *buffer, wxUint32 len);
  64
  65   bool SetSoundFormat(const wxSoundFormatBase& format);
  66
  67  protected:
  68   wxSoundRouterStream *m_router;
  69   wxUint8 m_n_bits, m_current_mask, m_current_b_pos, m_current_byte;
  70   wxUint8 *m_io_buffer;
  71   struct g72x_state *m_state;
  72
  73   int (*m_coder)(int code, int in_code, struct g72x_state *state);
  74   int (*m_decoder)(int code, int out_code, struct g72x_state *state);
  75
  76  protected:
  77   void PutBits(wxUint8 bits);
  78   wxUint8 GetBits();
  79 };
  80
  81 #endif