utils/wxMMedia/sndfrmt.h

   1 ////////////////////////////////////////////////////////////////////////////////
   2 // Name:       sndfrmt.h
   3 // Purpose:    wxMMedia
   4 // Author:     Guilhem Lavaux
   5 // Created:    1998
   6 // Updated:    December 1998
   7 // Copyright:  (C) 1997, 1998, Guilhem Lavaux
   8 // License:    wxWindows license
   9 ////////////////////////////////////////////////////////////////////////////////
  10 #ifndef __SNDFRMT_H__
  11 #define __SNDFRMT_H__
  12
  13 #ifdef __GNUG__
  14 #pragma interface
  15 #endif
  16
  17 #include <wx/object.h>
  18 #include <wx/stream.h>
  19
  20 class wxSndBuffer;
  21
  22 // Standard Microsoft types (why change ?)
  23 #define WXSOUND_PCM   0x0001
  24 #define WXSOUND_ADPCM 0x0002
  25 #define WXSOUND_ALAW  0x0006
  26 #define WXSOUND_ULAW  0x0007
  27
  28 class wxSoundCodec;
  29 class wxSoundDataFormat {
  30  public:
  31   wxSoundDataFormat();
  32   wxSoundDataFormat(const wxSoundDataFormat& format);
  33   ~wxSoundDataFormat();
  34
  35   void SetSampleRate(int srate) { m_srate = srate; }
  36   void SetChannels(int channels);
  37   void SetStereo(bool on);
  38   void SetCodecNo(int no);
  39   void SetCodecCreate(bool create) { m_codcreate = create; }
  40
  41   int GetSampleRate() const { return m_srate; }
  42   int GetChannels()  const { return m_channels; }
  43   bool GetStereo() const { return (m_channels == 2); }
  44   int GetCodecNo() const { return m_codno; }
  45
  46   wxSoundCodec *GetCodec();
  47
  48   wxSoundDataFormat& operator =(const wxSoundDataFormat& format);
  49   bool operator ==(const wxSoundDataFormat& format) const;
  50   bool operator !=(const wxSoundDataFormat& format) const
  51         { return !(operator ==(format)); }
  52
  53   /// PCM format
  54   void SetByteOrder(int order);
  55   void SetSign(int sign);
  56   int GetByteOrder() const { return m_byteorder; }
  57   int GetSign() const { return m_sign; }
  58
  59   void SetBps(int bps);
  60   int GetBps() const { return m_bps; }
  61
  62  protected:
  63   void CodecChange();
  64
  65  protected:
  66   int m_srate, m_bps, m_channels, m_codno;
  67   int m_byteorder, m_sign;
  68   bool m_codchange, m_codcreate;
  69   wxSoundCodec *m_codec;
  70 };
  71
  72 class wxSoundCodec : public wxObject, public wxStreamBase {
  73   DECLARE_ABSTRACT_CLASS(wxSoundCodec)
  74  public:
  75   typedef enum {
  76     WAITING = 0,
  77     ENCODING,
  78     DECODING
  79   } ModeType;
  80  public:
  81   wxSoundCodec();
  82   virtual ~wxSoundCodec();
  83
  84   void SetIOBuffer(wxSndBuffer *sndbuf) { m_io_sndbuf = sndbuf; }
  85   size_t Available();
  86
  87   void InitIO(const wxSoundDataFormat& format);
  88
  89   inline void SetInStream(wxStreamBuffer *s)
  90           { m_in_sound = s; }
  91   inline void SetOutStream(wxStreamBuffer *s)
  92           { m_out_sound = s; }
  93   inline wxStreamBuffer *GetInStream() const { return m_in_sound; }
  94   inline wxStreamBuffer *GetOutStream() const { return m_out_sound; }
  95
  96   inline bool StreamOk() const
  97        { return (m_in_sound->Stream()->LastError() == wxStream_NOERROR) &&
  98                 (m_out_sound->Stream()->LastError() == wxStream_NOERROR); }
  99
 100   virtual size_t GetByteRate() const = 0;
 101   virtual wxSoundDataFormat GetPreferredFormat(int codec = 0) const = 0;
 102
 103   virtual void InitMode(ModeType mode);
 104   virtual void ExitMode();
 105   virtual void Decode() = 0;
 106   virtual void Encode() = 0;
 107
 108   static wxSoundCodec *Get(int no);
 109
 110  protected:
 111   void CopyToOutput();
 112
 113   unsigned short Convert8_16(unsigned char s) { return (s & 0xff) << 8; }
 114   unsigned char Convert16_8(unsigned short s) { return (s & 0xff00) >> 8; }
 115
 116   bool ChainCodecBefore(wxSoundDataFormat& cod_to);
 117   bool ChainCodecAfter(wxSoundDataFormat& cod_to);
 118
 119   // -------------
 120   // wxStream part
 121   // -------------
 122   size_t OnSysWrite(const void *buffer, size_t bsize);
 123   size_t OnSysRead(void *buffer, size_t bsize);
 124
 125  protected:
 126   wxSndBuffer *m_io_sndbuf;
 127   wxSoundDataFormat m_io_format;
 128   wxStreamBuffer *m_in_sound, *m_out_sound;
 129   wxSoundCodec *m_chain_codec;
 130   bool m_init, m_chain_before;
 131   ModeType m_mode;
 132 };
 133
 134 #endif