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   int GetCodecNo() { return m_codno; }
  40   void SetCodecCreate(bool create) { m_codcreate = create; }
  41
  42   int GetSampleRate() const { return m_srate; }
  43   int GetChannels()  const { return m_channels; }
  44   bool GetStereo() const { return (m_channels == 2); }
  45   int GetCodecNo() const { return m_codno; }
  46
  47   wxSoundCodec *GetCodec();
  48
  49   wxSoundDataFormat& operator =(const wxSoundDataFormat& format);
  50   bool operator ==(const wxSoundDataFormat& format) const;
  51   bool operator !=(const wxSoundDataFormat& format) const
  52         { return !(operator ==(format)); }
  53
  54   /// PCM format
  55   void SetByteOrder(int order);
  56   void SetSign(int sign);
  57   int GetByteOrder() const { return m_byteorder; }
  58   int GetSign() const { return m_sign; }
  59
  60   void SetBps(int bps);
  61   int GetBps() const { return m_bps; }
  62
  63  protected:
  64   void CodecChange();
  65
  66  protected:
  67   int m_srate, m_bps, m_channels, m_codno;
  68   int m_byteorder, m_sign;
  69   bool m_codchange, m_codcreate;
  70   wxSoundCodec *m_codec;
  71 };
  72
  73 class wxSoundCodec : public wxObject, public wxStreamBase {
  74   DECLARE_ABSTRACT_CLASS(wxSoundCodec)
  75  public:
  76   typedef enum {
  77     WAITING = 0,
  78     ENCODING,
  79     DECODING
  80   } ModeType;
  81  public:
  82   wxSoundCodec();
  83   virtual ~wxSoundCodec();
  84
  85   void SetIOBuffer(wxSndBuffer *sndbuf) { m_io_sndbuf = sndbuf; }
  86   size_t Available();
  87
  88   void InitIO(const wxSoundDataFormat& format);
  89   virtual void InitWith(const wxSoundDataFormat& format) {}
  90
  91   inline void SetInStream(wxStreamBuffer *s)
  92           { m_in_sound = s; }
  93   inline void SetOutStream(wxStreamBuffer *s)
  94           { m_out_sound = s; }
  95   inline wxStreamBuffer *GetInStream() const { return m_in_sound; }
  96   inline wxStreamBuffer *GetOutStream() const { return m_out_sound; }
  97
  98   inline bool StreamOk() const
  99        { return (m_in_sound->Stream()->LastError() == wxStream_NOERROR) &&
 100                 (m_out_sound->Stream()->LastError() == wxStream_NOERROR); }
 101
 102   virtual size_t GetByteRate() const = 0;
 103   virtual wxSoundDataFormat GetPreferredFormat(int codec = 0) const = 0;
 104
 105   virtual void InitMode(ModeType mode);
 106   virtual void ExitMode();
 107   virtual void Decode() = 0;
 108   virtual void Encode() = 0;
 109
 110   static wxSoundCodec *Get(int no);
 111
 112  protected:
 113   void CopyToOutput();
 114
 115   unsigned short Convert8_16(unsigned char s) { return (s & 0xff) << 8; }
 116   unsigned char Convert16_8(unsigned short s) { return (s & 0xff00) >> 8; }
 117
 118   bool ChainCodecBefore(wxSoundDataFormat& cod_to);
 119   bool ChainCodecAfter(wxSoundDataFormat& cod_to);
 120
 121   // -------------
 122   // wxStream part
 123   // -------------
 124   size_t OnSysWrite(const void *buffer, size_t bsize);
 125   size_t OnSysRead(void *buffer, size_t bsize);
 126
 127  protected:
 128   wxSndBuffer *m_io_sndbuf;
 129   wxSoundDataFormat m_io_format;
 130   wxStreamBuffer *m_in_sound, *m_out_sound;
 131   wxSoundCodec *m_chain_codec;
 132   bool m_init, m_chain_before;
 133   ModeType m_mode;
 134 };
 135
 136 #endif