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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  20 #pragma interface "sound.h"
  21 #endif
  22
  23 #include "wx/object.h"
  24
  25 // ----------------------------------------------------------------------------
  26 // wxSound: simple audio playback class
  27 // ----------------------------------------------------------------------------
  28
  29 class wxSoundBackend;
  30 class wxSound;
  31 class wxDynamicLibrary;
  32
  33 /// Sound data, as loaded from .wav file:
  34 class wxSoundData
  35 {
  36 public:
  37     wxSoundData() : m_refCnt(1) {}
  38     void IncRef();
  39     void DecRef();
  40
  41     // .wav header information:
  42     unsigned m_channels;       // num of channels (mono:1, stereo:2)
  43     unsigned m_samplingRate;
  44     unsigned m_bitsPerSample;  // if 8, then m_data contains unsigned 8bit
  45                                // samples (wxUint8), if 16 then signed 16bit
  46                                // (wxInt16)
  47     unsigned m_samples;        // length in samples:
  48
  49     // wave data:
  50     size_t   m_dataBytes;
  51     wxUint8 *m_data;           // m_dataBytes bytes of data
  52
  53 private:
  54     ~wxSoundData();
  55     unsigned m_refCnt;
  56     wxUint8 *m_dataWithHeader; // ditto, but prefixed with .wav header
  57     friend class wxSound;
  58 };
  59
  60
  61 /// Simple sound class:
  62 class wxSound : public wxSoundBase
  63 {
  64 public:
  65     wxSound();
  66     wxSound(const wxString& fileName, bool isResource = false);
  67     wxSound(int size, const wxByte* data);
  68     ~wxSound();
  69
  70     // Create from resource or file
  71     bool Create(const wxString& fileName, bool isResource = false);
  72     // Create from data
  73     bool Create(int size, const wxByte* data);
  74
  75     bool IsOk() const { return m_data != NULL; }
  76
  77     // Stop playing any sound
  78     static void Stop();
  79
  80     // Returns true if a sound is being played
  81     static bool IsPlaying();
  82
  83     // for internal use
  84     static void UnloadBackend();
  85
  86 protected:
  87     bool DoPlay(unsigned flags) const;
  88
  89     static void EnsureBackend();
  90     void Free();
  91     bool LoadWAV(const wxUint8 *data, size_t length, bool copyData);
  92
  93     static wxSoundBackend *ms_backend;
  94 #if wxUSE_LIBSDL && wxUSE_PLUGINS
  95     // FIXME - temporary, until we have plugins architecture
  96     static wxDynamicLibrary *ms_backendSDL;
  97 #endif
  98
  99 private:
 100     wxSoundData *m_data;
 101 };
 102
 103
 104 // ----------------------------------------------------------------------------
 105 // wxSoundBackend:
 106 // ----------------------------------------------------------------------------
 107
 108 // This is interface to sound playing implementation. There are multiple
 109 // sound architectures in use on Unix platforms and wxWidgets can use several
 110 // of them for playback, depending on their availability at runtime; hence
 111 // the need for backends. This class is for use by wxWidgets and people writing
 112 // additional backends only, it is _not_ for use by applications!
 113
 114 // Structure that holds playback status information
 115 struct wxSoundPlaybackStatus
 116 {
 117     // playback is in progress
 118     bool m_playing;
 119     // main thread called wxSound::Stop()
 120     bool m_stopRequested;
 121 };
 122
 123 // Audio backend interface
 124 class wxSoundBackend
 125 {
 126 public:
 127     virtual ~wxSoundBackend() {}
 128
 129     // Returns the name of the backend (e.g. "Open Sound System")
 130     virtual wxString GetName() const = 0;
 131
 132     // Returns priority (higher priority backends are tried first)
 133     virtual int GetPriority() const = 0;
 134
 135     // Checks if the backend's audio system is available and the backend can
 136     // be used for playback
 137     virtual bool IsAvailable() const = 0;
 138
 139     // Returns true if the backend is capable of playing sound asynchronously.
 140     // If false, then wxWidgets creates a playback thread and handles async
 141     // playback, otherwise it is left up to the backend (will usually be more
 142     // effective).
 143     virtual bool HasNativeAsyncPlayback() const = 0;
 144
 145     // Plays the sound. flags are same flags as those passed to wxSound::Play.
 146     // The function should periodically check the value of
 147     // status->m_stopRequested and terminate if it is set to true (it may
 148     // be modified by another thread)
 149     virtual bool Play(wxSoundData *data, unsigned flags,
 150                       volatile wxSoundPlaybackStatus *status) = 0;
 151
 152     // Stops playback (if something is played).
 153     virtual void Stop() = 0;
 154
 155     // Returns true if the backend is playing anything at the moment.
 156     // (This method is never called for backends that don't support async
 157     // playback.)
 158     virtual bool IsPlaying() const = 0;
 159 };
 160
 161
 162 #endif // wxUSE_SOUND
 163
 164 #endif