include/wx/unix/sound.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        sound.h
   3 // Purpose:     wxSound class
   4 // Author:      Julian Smart, Vaclav Slavik
   5 // Modified by:
   6 // Created:     25/10/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart, Vaclav Slavik
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_SOUND_H_
  13 #define _WX_SOUND_H_
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_SOUND
  18
  19 #include "wx/object.h"
  20
  21 // ----------------------------------------------------------------------------
  22 // wxSound: simple audio playback class
  23 // ----------------------------------------------------------------------------
  24
  25 class WXDLLIMPEXP_ADV wxSoundBackend;
  26 class WXDLLIMPEXP_ADV wxSound;
  27 class WXDLLIMPEXP_BASE wxDynamicLibrary;
  28
  29 /// Sound data, as loaded from .wav file:
  30 class WXDLLIMPEXP_ADV wxSoundData
  31 {
  32 public:
  33     wxSoundData() : m_refCnt(1) {}
  34     void IncRef();
  35     void DecRef();
  36
  37     // .wav header information:
  38     unsigned m_channels;       // num of channels (mono:1, stereo:2)
  39     unsigned m_samplingRate;
  40     unsigned m_bitsPerSample;  // if 8, then m_data contains unsigned 8bit
  41                                // samples (wxUint8), if 16 then signed 16bit
  42                                // (wxInt16)
  43     unsigned m_samples;        // length in samples:
  44
  45     // wave data:
  46     size_t   m_dataBytes;
  47     wxUint8 *m_data;           // m_dataBytes bytes of data
  48
  49 private:
  50     ~wxSoundData();
  51     unsigned m_refCnt;
  52     wxUint8 *m_dataWithHeader; // ditto, but prefixed with .wav header
  53     friend class wxSound;
  54 };
  55
  56
  57 /// Simple sound class:
  58 class WXDLLIMPEXP_ADV wxSound : public wxSoundBase
  59 {
  60 public:
  61     wxSound();
  62     wxSound(const wxString& fileName, bool isResource = false);
  63     wxSound(int size, const wxByte* data);
  64     ~wxSound();
  65
  66     // Create from resource or file
  67     bool Create(const wxString& fileName, bool isResource = false);
  68     // Create from data
  69     bool Create(int size, const wxByte* data);
  70
  71     bool IsOk() const { return m_data != NULL; }
  72
  73     // Stop playing any sound
  74     static void Stop();
  75
  76     // Returns true if a sound is being played
  77     static bool IsPlaying();
  78
  79     // for internal use
  80     static void UnloadBackend();
  81
  82 protected:
  83     bool DoPlay(unsigned flags) const;
  84
  85     static void EnsureBackend();
  86     void Free();
  87     bool LoadWAV(const wxUint8 *data, size_t length, bool copyData);
  88
  89     static wxSoundBackend *ms_backend;
  90 #if wxUSE_LIBSDL && wxUSE_PLUGINS
  91     // FIXME - temporary, until we have plugins architecture
  92     static wxDynamicLibrary *ms_backendSDL;
  93 #endif
  94
  95 private:
  96     wxSoundData *m_data;
  97 };
  98
  99
 100 // ----------------------------------------------------------------------------
 101 // wxSoundBackend:
 102 // ----------------------------------------------------------------------------
 103
 104 // This is interface to sound playing implementation. There are multiple
 105 // sound architectures in use on Unix platforms and wxWidgets can use several
 106 // of them for playback, depending on their availability at runtime; hence
 107 // the need for backends. This class is for use by wxWidgets and people writing
 108 // additional backends only, it is _not_ for use by applications!
 109
 110 // Structure that holds playback status information
 111 struct wxSoundPlaybackStatus
 112 {
 113     // playback is in progress
 114     bool m_playing;
 115     // main thread called wxSound::Stop()
 116     bool m_stopRequested;
 117 };
 118
 119 // Audio backend interface
 120 class WXDLLIMPEXP_ADV wxSoundBackend
 121 {
 122 public:
 123     virtual ~wxSoundBackend() {}
 124
 125     // Returns the name of the backend (e.g. "Open Sound System")
 126     virtual wxString GetName() const = 0;
 127
 128     // Returns priority (higher priority backends are tried first)
 129     virtual int GetPriority() const = 0;
 130
 131     // Checks if the backend's audio system is available and the backend can
 132     // be used for playback
 133     virtual bool IsAvailable() const = 0;
 134
 135     // Returns true if the backend is capable of playing sound asynchronously.
 136     // If false, then wxWidgets creates a playback thread and handles async
 137     // playback, otherwise it is left up to the backend (will usually be more
 138     // effective).
 139     virtual bool HasNativeAsyncPlayback() const = 0;
 140
 141     // Plays the sound. flags are same flags as those passed to wxSound::Play.
 142     // The function should periodically check the value of
 143     // status->m_stopRequested and terminate if it is set to true (it may
 144     // be modified by another thread)
 145     virtual bool Play(wxSoundData *data, unsigned flags,
 146                       volatile wxSoundPlaybackStatus *status) = 0;
 147
 148     // Stops playback (if something is played).
 149     virtual void Stop() = 0;
 150
 151     // Returns true if the backend is playing anything at the moment.
 152     // (This method is never called for backends that don't support async
 153     // playback.)
 154     virtual bool IsPlaying() const = 0;
 155 };
 156
 157
 158 #endif // wxUSE_SOUND
 159
 160 #endif