Added missing const for comparision operators.

[wxWidgets.git] / include / wx / unix / sound.h

diff --git a/include/wx/unix/sound.h b/include/wx/unix/sound.h
index c85b0ef8666d7df02d6b4b369b3067c24b05c207..2d2a349869cbc0215ffd772a3b06e491b40784f5 100644 (file)
--- a/include/wx/unix/sound.h
+++ b/include/wx/unix/sound.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        wave.h
+// Name:        sound.h
 // Purpose:     wxSound class
 // Author:      Julian Smart, Vaclav Slavik
 // Modified by:
@@ -14,7 +14,7 @@
 
 #include "wx/defs.h"
 
-#if wxUSE_WAVE
+#if wxUSE_SOUND
 
 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
 #pragma interface "sound.h"
@@ -73,12 +73,18 @@ public:
     bool Create(int size, const wxByte* data);
 
     bool IsOk() const { return m_data != NULL; }
+   
+    // Stop playing any sound
+    static void Stop();
+
+    // Returns true if a sound is being played
+    static bool IsPlaying();
     
     // for internal use
     static void UnloadBackend();
     
 protected:
-    bool DoPlay(unsigned flags);
+    bool DoPlay(unsigned flags) const;
 
     static void EnsureBackend();
     void Free();
@@ -105,6 +111,16 @@ private:
 // the need for backends. This class is for use by wxWindows and people writing
 // additional backends only, it is _not_ for use by applications! 
 
+// Structure that holds playback status information
+struct wxSoundPlaybackStatus
+{
+    // playback is in progress
+    bool m_playing;
+    // main thread called wxSound::Stop()
+    bool m_stopRequested;
+};
+
+// Audio backend interface
 class wxSoundBackend
 {
 public:
@@ -123,14 +139,26 @@ public:
     // Returns true if the backend is capable of playing sound asynchronously.
     // If false, then wxWindows creates a playback thread and handles async
     // playback, otherwise it is left up to the backend (will usually be more
-    // effective)
+    // effective).
     virtual bool HasNativeAsyncPlayback() const = 0;
-
-    // Plays the sound. flags are same flags as those passed to wxSound::Play
-    virtual bool Play(wxSoundData *data, unsigned flags) = 0;
+    
+    // Plays the sound. flags are same flags as those passed to wxSound::Play.
+    // The function should periodically check the value of
+    // status->m_stopRequested and terminate if it is set to true (it may
+    // be modified by another thread)
+    virtual bool Play(wxSoundData *data, unsigned flags,
+                      volatile wxSoundPlaybackStatus *status) = 0;
+
+    // Stops playback (if something is played).
+    virtual void Stop() = 0;
+
+    // Returns true if the backend is playing anything at the moment.
+    // (This method is never called for backends that don't support async
+    // playback.)
+    virtual bool IsPlaying() const = 0;
 };
 
 
-#endif // wxUSE_WAVE
+#endif // wxUSE_SOUND
 
 #endif