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   typedef enum {
  67     WAITING = 0,
  68     ENCODING,
  69     DECODING
  70   } ModeType;
  71  public:
  72   wxSoundCodec();
  73   virtual ~wxSoundCodec();
  74
  75   void SetIOBuffer(wxSndBuffer *sndbuf) { m_io_sndbuf = sndbuf; }
  76   size_t Available();
  77
  78   void InitIO(const wxSoundDataFormat& format);
  79
  80   inline void SetInStream(wxStreamBuffer *s)
  81           { m_in_sound = s; }
  82   inline void SetOutStream(wxStreamBuffer *s)
  83           { m_out_sound = s; }
  84   inline wxStreamBuffer *GetInStream() const { return m_in_sound; }
  85   inline wxStreamBuffer *GetOutStream() const { return m_out_sound; }
  86
  87   inline bool StreamOk() const
  88        { return (m_in_sound->Stream()->LastError() == wxStream_NOERROR) &&
  89                 (m_out_sound->Stream()->LastError() == wxStream_NOERROR); }
  90
  91   virtual size_t GetByteRate() const = 0;
  92   virtual wxSoundDataFormat GetPreferredFormat(int codec = 0) const = 0;
  93
  94   virtual void InitMode(ModeType mode);
  95   virtual void ExitMode();
  96   virtual void Decode() = 0;
  97   virtual void Encode() = 0;
  98
  99   static wxSoundCodec *Get(int no);
 100
 101  protected:
 102   void CopyToOutput();
 103
 104   unsigned short Convert8_16(unsigned char s) { return (s & 0xff) << 8; }
 105   unsigned char Convert16_8(unsigned short s) { return (s & 0xff00) >> 8; }
 106
 107   bool ChainCodecBefore(wxSoundDataFormat& cod_to);
 108   bool ChainCodecAfter(wxSoundDataFormat& cod_to);
 109
 110   // -------------
 111   // wxStream part
 112   // -------------
 113   size_t OnSysWrite(const void *buffer, size_t bsize);
 114   size_t OnSysRead(void *buffer, size_t bsize);
 115
 116  protected:
 117   wxSndBuffer *m_io_sndbuf;
 118   wxSoundDataFormat m_io_format;
 119   wxStreamBuffer *m_in_sound, *m_out_sound;
 120   wxSoundCodec *m_chain_codec;
 121   bool m_init, m_chain_before;
 122   ModeType m_mode;
 123 };
 124
 125 #endif