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