utils/wxMMedia/sndfrmt.h

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