src/unix/sound.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/unix/sound.cpp
   3 // Purpose:     wxSound
   4 // Author:      Marcel Rasche, Vaclav Slavik
   5 // Modified by:
   6 // Created:     25/10/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart, Open Source Applications Foundation
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // for compilers that support precompilation, includes "wx.h".
  13 #include "wx/wxprec.h"
  14
  15 #if defined(__BORLANDC__)
  16 #pragma hdrstop
  17 #endif
  18
  19 #if wxUSE_SOUND
  20
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <sys/ioctl.h>
  25
  26 #ifdef HAVE_SYS_SOUNDCARD_H
  27 #include <sys/soundcard.h>
  28 #endif
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/event.h"
  32     #include "wx/intl.h"
  33     #include "wx/log.h"
  34 #endif
  35
  36 #include "wx/thread.h"
  37 #include "wx/file.h"
  38 #include "wx/module.h"
  39 #include "wx/sound.h"
  40 #include "wx/dynlib.h"
  41
  42
  43 #if wxUSE_THREADS
  44 // mutex for all wxSound's synchronization
  45 static wxMutex gs_soundMutex;
  46 #endif
  47
  48 // ----------------------------------------------------------------------------
  49 // wxSoundData
  50 // ----------------------------------------------------------------------------
  51
  52 void wxSoundData::IncRef()
  53 {
  54 #if wxUSE_THREADS
  55     wxMutexLocker locker(gs_soundMutex);
  56 #endif
  57     m_refCnt++;
  58 }
  59
  60 void wxSoundData::DecRef()
  61 {
  62 #if wxUSE_THREADS
  63     wxMutexLocker locker(gs_soundMutex);
  64 #endif
  65     if (--m_refCnt == 0)
  66         delete this;
  67 }
  68
  69 wxSoundData::~wxSoundData()
  70 {
  71     delete[] m_dataWithHeader;
  72 }
  73
  74
  75 // ----------------------------------------------------------------------------
  76 // wxSoundBackendNull, used in absence of audio API or card
  77 // ----------------------------------------------------------------------------
  78
  79 class wxSoundBackendNull : public wxSoundBackend
  80 {
  81 public:
  82     wxString GetName() const { return _("No sound"); }
  83     int GetPriority() const { return 0; }
  84     bool IsAvailable() const { return true; }
  85     bool HasNativeAsyncPlayback() const { return true; }
  86     bool Play(wxSoundData *WXUNUSED(data), unsigned WXUNUSED(flags),
  87               volatile wxSoundPlaybackStatus *WXUNUSED(status))
  88         { return true; }
  89     void Stop() {}
  90     bool IsPlaying() const { return false; }
  91 };
  92
  93
  94 // ----------------------------------------------------------------------------
  95 // wxSoundBackendOSS, for Linux
  96 // ----------------------------------------------------------------------------
  97
  98 #ifdef HAVE_SYS_SOUNDCARD_H
  99
 100 #ifndef AUDIODEV
 101 #define AUDIODEV   "/dev/dsp"    // Default path for audio device
 102 #endif
 103
 104 class wxSoundBackendOSS : public wxSoundBackend
 105 {
 106 public:
 107     wxString GetName() const { return _T("Open Sound System"); }
 108     int GetPriority() const { return 10; }
 109     bool IsAvailable() const;
 110     bool HasNativeAsyncPlayback() const { return false; }
 111     bool Play(wxSoundData *data, unsigned flags,
 112               volatile wxSoundPlaybackStatus *status);
 113     void Stop() {}
 114     bool IsPlaying() const { return false; }
 115
 116 private:
 117     int OpenDSP(const wxSoundData *data);
 118     bool InitDSP(int dev, const wxSoundData *data);
 119
 120     int m_DSPblkSize;        // Size of the DSP buffer
 121     bool m_needConversion;
 122 };
 123
 124 bool wxSoundBackendOSS::IsAvailable() const
 125 {
 126     int fd;
 127     fd = open(AUDIODEV, O_WRONLY | O_NONBLOCK);
 128     if (fd < 0)
 129         return false;
 130     close(fd);
 131     return true;
 132 }
 133
 134 bool wxSoundBackendOSS::Play(wxSoundData *data, unsigned flags,
 135                              volatile wxSoundPlaybackStatus *status)
 136 {
 137     int dev = OpenDSP(data);
 138
 139     if (dev < 0)
 140         return false;
 141
 142     ioctl(dev, SNDCTL_DSP_SYNC, 0);
 143
 144     do
 145     {
 146         bool play = true;
 147         int i;
 148         unsigned l = 0;
 149         size_t datasize = data->m_dataBytes;
 150
 151         do
 152         {
 153             if (status->m_stopRequested)
 154             {
 155                 wxLogTrace(_T("sound"), _T("playback stopped"));
 156                 close(dev);
 157                 return true;
 158             }
 159
 160             i= (int)((l + m_DSPblkSize) < datasize ?
 161                      m_DSPblkSize : (datasize - l));
 162             if (write(dev, &data->m_data[l], i) != i)
 163             {
 164                 play = false;
 165             }
 166             l += i;
 167         } while (play && l < datasize);
 168     } while (flags & wxSOUND_LOOP);
 169
 170     close(dev);
 171     return true;
 172 }
 173
 174 int wxSoundBackendOSS::OpenDSP(const wxSoundData *data)
 175 {
 176     int dev = -1;
 177
 178     if ((dev = open(AUDIODEV, O_WRONLY, 0)) <0)
 179         return -1;
 180
 181     if (!InitDSP(dev, data) || m_needConversion)
 182     {
 183         close(dev);
 184         return -1;
 185     }
 186
 187     return dev;
 188 }
 189
 190
 191 bool wxSoundBackendOSS::InitDSP(int dev, const wxSoundData *data)
 192 {
 193     unsigned tmp;
 194
 195     // Reset the dsp
 196     if (ioctl(dev, SNDCTL_DSP_RESET, 0) < 0)
 197     {
 198         wxLogTrace(_T("sound"), _T("unable to reset dsp"));
 199         return false;
 200     }
 201
 202     m_needConversion = false;
 203
 204     tmp = data->m_bitsPerSample;
 205     if (ioctl(dev, SNDCTL_DSP_SAMPLESIZE, &tmp) < 0)
 206     {
 207         wxLogTrace(_T("sound"), _T("IOCTL failure (SNDCTL_DSP_SAMPLESIZE)"));
 208         return false;
 209     }
 210     if (tmp != data->m_bitsPerSample)
 211     {
 212         wxLogTrace(_T("sound"),
 213                    _T("Unable to set DSP sample size to %d (wants %d)"),
 214                    data->m_bitsPerSample, tmp);
 215         m_needConversion = true;
 216     }
 217
 218     unsigned stereo = data->m_channels == 1 ? 0 : 1;
 219     tmp = stereo;
 220     if (ioctl(dev, SNDCTL_DSP_STEREO, &tmp) < 0)
 221     {
 222         wxLogTrace(_T("sound"), _T("IOCTL failure (SNDCTL_DSP_STEREO)"));
 223         return false;
 224     }
 225     if (tmp != stereo)
 226     {
 227         wxLogTrace(_T("sound"), _T("Unable to set DSP to %s."), stereo?  _T("stereo"):_T("mono"));
 228         m_needConversion = true;
 229     }
 230
 231     tmp = data->m_samplingRate;
 232     if (ioctl(dev, SNDCTL_DSP_SPEED, &tmp) < 0)
 233     {
 234         wxLogTrace(_T("sound"), _T("IOCTL failure (SNDCTL_DSP_SPEED)"));
 235        return false;
 236     }
 237     if (tmp != data->m_samplingRate)
 238     {
 239         // If the rate the sound card is using is not within 1% of what the
 240         // data specified then override the data setting.  The only reason not
 241         // to always override this is because of clock-rounding
 242         // problems. Sound cards will sometimes use things like 44101 when you
 243         // ask for 44100.  No need overriding this and having strange output
 244         // file rates for something that we can't hear anyways.
 245         if (data->m_samplingRate - tmp > (tmp * .01) ||
 246             tmp - data->m_samplingRate > (tmp * .01)) {
 247             wxLogTrace(_T("sound"),
 248                        _T("Unable to set DSP sampling rate to %d (wants %d)"),
 249                        data->m_samplingRate, tmp);
 250             m_needConversion = true;
 251         }
 252     }
 253
 254     // Do this last because some drivers can adjust the buffer sized based on
 255     // the sampling rate, etc.
 256     if (ioctl(dev, SNDCTL_DSP_GETBLKSIZE, &m_DSPblkSize) < 0)
 257     {
 258         wxLogTrace(_T("sound"), _T("IOCTL failure (SNDCTL_DSP_GETBLKSIZE)"));
 259         return false;
 260     }
 261     return true;
 262 }
 263
 264 #endif // HAVE_SYS_SOUNDCARD_H
 265
 266 // ----------------------------------------------------------------------------
 267 // wxSoundSyncOnlyAdaptor
 268 // ----------------------------------------------------------------------------
 269
 270 #if wxUSE_THREADS
 271
 272 class wxSoundSyncOnlyAdaptor;
 273
 274 // this class manages asynchronous playback of audio if the backend doesn't
 275 // support it natively (e.g. OSS backend)
 276 class wxSoundAsyncPlaybackThread : public wxThread
 277 {
 278 public:
 279     wxSoundAsyncPlaybackThread(wxSoundSyncOnlyAdaptor *adaptor,
 280                               wxSoundData *data, unsigned flags)
 281         : wxThread(), m_adapt(adaptor), m_data(data), m_flags(flags) {}
 282     virtual ExitCode Entry();
 283
 284 protected:
 285     wxSoundSyncOnlyAdaptor *m_adapt;
 286     wxSoundData *m_data;
 287     unsigned m_flags;
 288 };
 289
 290 #endif // wxUSE_THREADS
 291
 292 // This class turns wxSoundBackend that doesn't support asynchronous playback
 293 // into one that does
 294 class wxSoundSyncOnlyAdaptor : public wxSoundBackend
 295 {
 296 public:
 297     wxSoundSyncOnlyAdaptor(wxSoundBackend *backend)
 298         : m_backend(backend), m_playing(false) {}
 299     ~wxSoundSyncOnlyAdaptor()
 300     {
 301         delete m_backend;
 302     }
 303     wxString GetName() const
 304     {
 305         return m_backend->GetName();
 306     }
 307     int GetPriority() const
 308     {
 309         return m_backend->GetPriority();
 310     }
 311     bool IsAvailable() const
 312     {
 313         return m_backend->IsAvailable();
 314     }
 315     bool HasNativeAsyncPlayback() const
 316     {
 317         return true;
 318     }
 319     bool Play(wxSoundData *data, unsigned flags,
 320               volatile wxSoundPlaybackStatus *status);
 321     void Stop();
 322     bool IsPlaying() const;
 323
 324 private:
 325     friend class wxSoundAsyncPlaybackThread;
 326
 327     wxSoundBackend *m_backend;
 328     bool m_playing;
 329 #if wxUSE_THREADS
 330     // player thread holds this mutex and releases it after it finishes
 331     // playing, so that the main thread knows when it can play sound
 332     wxMutex m_mutexRightToPlay;
 333     wxSoundPlaybackStatus m_status;
 334 #endif
 335 };
 336
 337
 338 #if wxUSE_THREADS
 339 wxThread::ExitCode wxSoundAsyncPlaybackThread::Entry()
 340 {
 341     m_adapt->m_backend->Play(m_data, m_flags & ~wxSOUND_ASYNC,
 342                              &m_adapt->m_status);
 343
 344     m_data->DecRef();
 345     m_adapt->m_playing = false;
 346     m_adapt->m_mutexRightToPlay.Unlock();
 347     wxLogTrace(_T("sound"), _T("terminated async playback thread"));
 348     return 0;
 349 }
 350 #endif
 351
 352 bool wxSoundSyncOnlyAdaptor::Play(wxSoundData *data, unsigned flags,
 353                                   volatile wxSoundPlaybackStatus *status)
 354 {
 355     Stop();
 356     if (flags & wxSOUND_ASYNC)
 357     {
 358 #if wxUSE_THREADS
 359         m_mutexRightToPlay.Lock();
 360         m_status.m_playing = true;
 361         m_status.m_stopRequested = false;
 362         data->IncRef();
 363         wxThread *th = new wxSoundAsyncPlaybackThread(this, data, flags);
 364         th->Create();
 365         th->Run();
 366         wxLogTrace(_T("sound"), _T("launched async playback thread"));
 367         return true;
 368 #else
 369         wxLogError(_("Unable to play sound asynchronously."));
 370         return false;
 371 #endif
 372     }
 373     else
 374     {
 375 #if wxUSE_THREADS
 376         m_mutexRightToPlay.Lock();
 377 #endif
 378         bool rv = m_backend->Play(data, flags, status);
 379 #if wxUSE_THREADS
 380         m_mutexRightToPlay.Unlock();
 381 #endif
 382         return rv;
 383     }
 384 }
 385
 386 void wxSoundSyncOnlyAdaptor::Stop()
 387 {
 388     wxLogTrace(_T("sound"), _T("asking audio to stop"));
 389
 390 #if wxUSE_THREADS
 391     // tell the player thread (if running) to stop playback ASAP:
 392     m_status.m_stopRequested = true;
 393
 394     // acquire the mutex to be sure no sound is being played, then
 395     // release it because we don't need it for anything (the effect of this
 396     // is that calling thread will wait until playback thread reacts to
 397     // our request to interrupt playback):
 398     m_mutexRightToPlay.Lock();
 399     m_mutexRightToPlay.Unlock();
 400     wxLogTrace(_T("sound"), _T("audio was stopped"));
 401 #endif
 402 }
 403
 404 bool wxSoundSyncOnlyAdaptor::IsPlaying() const
 405 {
 406 #if wxUSE_THREADS
 407     return m_status.m_playing;
 408 #else
 409     return false;
 410 #endif
 411 }
 412
 413
 414 // ----------------------------------------------------------------------------
 415 // wxSound
 416 // ----------------------------------------------------------------------------
 417
 418 wxSoundBackend *wxSound::ms_backend = NULL;
 419
 420 // FIXME - temporary, until we have plugins architecture
 421 #if wxUSE_LIBSDL
 422     #if wxUSE_PLUGINS
 423         wxDynamicLibrary *wxSound::ms_backendSDL = NULL;
 424     #else
 425         extern "C" wxSoundBackend *wxCreateSoundBackendSDL();
 426     #endif
 427 #endif
 428
 429 wxSound::wxSound() : m_data(NULL)
 430 {
 431 }
 432
 433 wxSound::wxSound(const wxString& sFileName, bool isResource) : m_data(NULL)
 434 {
 435     Create(sFileName, isResource);
 436 }
 437
 438 wxSound::wxSound(int size, const wxByte* data) : m_data(NULL)
 439 {
 440     Create(size, data);
 441 }
 442
 443 wxSound::~wxSound()
 444 {
 445     Free();
 446 }
 447
 448 bool wxSound::Create(const wxString& fileName,
 449                      bool WXUNUSED_UNLESS_DEBUG(isResource))
 450 {
 451     wxASSERT_MSG( !isResource,
 452              _T("Loading sound from resources is only supported on Windows") );
 453
 454     Free();
 455
 456     wxFile fileWave;
 457     if (!fileWave.Open(fileName, wxFile::read))
 458     {
 459         return false;
 460     }
 461
 462     wxFileOffset lenOrig = fileWave.Length();
 463     if ( lenOrig == wxInvalidOffset )
 464         return false;
 465
 466     size_t len = wx_truncate_cast(size_t, lenOrig);
 467     wxUint8 *data = new wxUint8[len];
 468     if ( fileWave.Read(data, len) != lenOrig )
 469     {
 470         delete [] data;
 471         wxLogError(_("Couldn't load sound data from '%s'."), fileName.c_str());
 472         return false;
 473     }
 474
 475     if (!LoadWAV(data, len, false))
 476     {
 477         delete [] data;
 478         wxLogError(_("Sound file '%s' is in unsupported format."),
 479                    fileName.c_str());
 480         return false;
 481     }
 482
 483     return true;
 484 }
 485
 486 bool wxSound::Create(int size, const wxByte* data)
 487 {
 488     wxASSERT( data != NULL );
 489
 490     Free();
 491     if (!LoadWAV(data, size, true))
 492     {
 493         wxLogError(_("Sound data are in unsupported format."));
 494         return false;
 495     }
 496     return true;
 497 }
 498
 499 /*static*/ void wxSound::EnsureBackend()
 500 {
 501     if (!ms_backend)
 502     {
 503         // FIXME -- make this fully dynamic when plugins architecture is in
 504         // place
 505 #if wxUSE_LIBSDL
 506         //if (!ms_backend)
 507         {
 508 #if !wxUSE_PLUGINS
 509             ms_backend = wxCreateSoundBackendSDL();
 510 #else
 511             wxString dllname;
 512             dllname.Printf(_T("%s/%s"),
 513                 wxDynamicLibrary::GetPluginsDirectory().c_str(),
 514                 wxDynamicLibrary::CanonicalizePluginName(
 515                     _T("sound_sdl"), wxDL_PLUGIN_BASE).c_str());
 516             wxLogTrace(_T("sound"),
 517                        _T("trying to load SDL plugin from '%s'..."),
 518                        dllname.c_str());
 519             wxLogNull null;
 520             ms_backendSDL = new wxDynamicLibrary(dllname, wxDL_NOW);
 521             if (!ms_backendSDL->IsLoaded())
 522             {
 523                 wxDELETE(ms_backendSDL);
 524             }
 525             else
 526             {
 527                 typedef wxSoundBackend *(*wxCreateSoundBackend_t)();
 528                 wxDYNLIB_FUNCTION(wxCreateSoundBackend_t,
 529                                   wxCreateSoundBackendSDL, *ms_backendSDL);
 530                 if (pfnwxCreateSoundBackendSDL)
 531                 {
 532                     ms_backend = (*pfnwxCreateSoundBackendSDL)();
 533                 }
 534             }
 535 #endif
 536             if (ms_backend && !ms_backend->IsAvailable())
 537             {
 538                 wxDELETE(ms_backend);
 539             }
 540         }
 541 #endif
 542
 543 #ifdef HAVE_SYS_SOUNDCARD_H
 544         if (!ms_backend)
 545         {
 546             ms_backend = new wxSoundBackendOSS();
 547             if (!ms_backend->IsAvailable())
 548             {
 549                 wxDELETE(ms_backend);
 550             }
 551         }
 552 #endif
 553
 554         if (!ms_backend)
 555             ms_backend = new wxSoundBackendNull();
 556
 557         if (!ms_backend->HasNativeAsyncPlayback())
 558             ms_backend = new wxSoundSyncOnlyAdaptor(ms_backend);
 559
 560         wxLogTrace(_T("sound"),
 561                    _T("using backend '%s'"), ms_backend->GetName().c_str());
 562     }
 563 }
 564
 565 /*static*/ void wxSound::UnloadBackend()
 566 {
 567     if (ms_backend)
 568     {
 569         wxLogTrace(_T("sound"), _T("unloading backend"));
 570
 571         Stop();
 572
 573         delete ms_backend;
 574         ms_backend = NULL;
 575 #if wxUSE_LIBSDL && wxUSE_PLUGINS
 576         delete ms_backendSDL;
 577 #endif
 578     }
 579 }
 580
 581 bool wxSound::DoPlay(unsigned flags) const
 582 {
 583     wxCHECK_MSG( IsOk(), false, _T("Attempt to play invalid wave data") );
 584
 585     EnsureBackend();
 586     wxSoundPlaybackStatus status;
 587     status.m_playing = true;
 588     status.m_stopRequested = false;
 589     return ms_backend->Play(m_data, flags, &status);
 590 }
 591
 592 /*static*/ void wxSound::Stop()
 593 {
 594     if (ms_backend)
 595         ms_backend->Stop();
 596 }
 597
 598 /*static*/ bool wxSound::IsPlaying()
 599 {
 600     if (ms_backend)
 601         return ms_backend->IsPlaying();
 602     else
 603         return false;
 604 }
 605
 606 void wxSound::Free()
 607 {
 608     if (m_data)
 609         m_data->DecRef();
 610 }
 611
 612 typedef struct
 613 {
 614     wxUint32      uiSize;
 615     wxUint16      uiFormatTag;
 616     wxUint16      uiChannels;
 617     wxUint32      ulSamplesPerSec;
 618     wxUint32      ulAvgBytesPerSec;
 619     wxUint16      uiBlockAlign;
 620     wxUint16      uiBitsPerSample;
 621 } WAVEFORMAT;
 622
 623 #define WAVE_FORMAT_PCM  1
 624 #define WAVE_INDEX       8
 625 #define FMT_INDEX       12
 626
 627 bool wxSound::LoadWAV(const wxUint8 *data, size_t length, bool copyData)
 628 {
 629     // the simplest wave file header consists of 44 bytes:
 630     //
 631     //      0   "RIFF"
 632     //      4   file size - 8
 633     //      8   "WAVE"
 634     //
 635     //      12  "fmt "
 636     //      16  chunk size                  |
 637     //      20  format tag                  |
 638     //      22  number of channels          |
 639     //      24  sample rate                 | WAVEFORMAT
 640     //      28  average bytes per second    |
 641     //      32  bytes per frame             |
 642     //      34  bits per sample             |
 643     //
 644     //      36  "data"
 645     //      40  number of data bytes
 646     //      44  (wave signal) data
 647     //
 648     // so check that we have at least as much
 649     if ( length < 44 )
 650         return false;
 651
 652     WAVEFORMAT waveformat;
 653     memcpy(&waveformat, &data[FMT_INDEX + 4], sizeof(WAVEFORMAT));
 654     waveformat.uiSize = wxUINT32_SWAP_ON_BE(waveformat.uiSize);
 655     waveformat.uiFormatTag = wxUINT16_SWAP_ON_BE(waveformat.uiFormatTag);
 656     waveformat.uiChannels = wxUINT16_SWAP_ON_BE(waveformat.uiChannels);
 657     waveformat.ulSamplesPerSec = wxUINT32_SWAP_ON_BE(waveformat.ulSamplesPerSec);
 658     waveformat.ulAvgBytesPerSec = wxUINT32_SWAP_ON_BE(waveformat.ulAvgBytesPerSec);
 659     waveformat.uiBlockAlign = wxUINT16_SWAP_ON_BE(waveformat.uiBlockAlign);
 660     waveformat.uiBitsPerSample = wxUINT16_SWAP_ON_BE(waveformat.uiBitsPerSample);
 661
 662     // get the sound data size
 663     wxUint32 ul;
 664     memcpy(&ul, &data[FMT_INDEX + waveformat.uiSize + 12], 4);
 665     ul = wxUINT32_SWAP_ON_BE(ul);
 666
 667     if ( length < ul + FMT_INDEX + waveformat.uiSize + 16 )
 668         return false;
 669
 670     if (memcmp(data, "RIFF", 4) != 0)
 671         return false;
 672     if (memcmp(&data[WAVE_INDEX], "WAVE", 4) != 0)
 673         return false;
 674     if (memcmp(&data[FMT_INDEX], "fmt ", 4) != 0)
 675         return false;
 676     if (memcmp(&data[FMT_INDEX + waveformat.uiSize + 8], "data", 4) != 0)
 677         return false;
 678
 679     if (waveformat.uiFormatTag != WAVE_FORMAT_PCM)
 680         return false;
 681
 682     if (waveformat.ulSamplesPerSec !=
 683         waveformat.ulAvgBytesPerSec / waveformat.uiBlockAlign)
 684         return false;
 685
 686     m_data = new wxSoundData;
 687     m_data->m_channels = waveformat.uiChannels;
 688     m_data->m_samplingRate = waveformat.ulSamplesPerSec;
 689     m_data->m_bitsPerSample = waveformat.uiBitsPerSample;
 690     m_data->m_samples = ul / (m_data->m_channels * m_data->m_bitsPerSample / 8);
 691     m_data->m_dataBytes = ul;
 692
 693     if (copyData)
 694     {
 695         m_data->m_dataWithHeader = new wxUint8[length];
 696         memcpy(m_data->m_dataWithHeader, data, length);
 697     }
 698     else
 699         m_data->m_dataWithHeader = (wxUint8*)data;
 700
 701     m_data->m_data =
 702         (&m_data->m_dataWithHeader[FMT_INDEX + waveformat.uiSize + 8]);
 703
 704     return true;
 705 }
 706
 707
 708 // ----------------------------------------------------------------------------
 709 // wxSoundCleanupModule
 710 // ----------------------------------------------------------------------------
 711
 712 class wxSoundCleanupModule: public wxModule
 713 {
 714 public:
 715     bool OnInit() { return true; }
 716     void OnExit() { wxSound::UnloadBackend(); }
 717     DECLARE_DYNAMIC_CLASS(wxSoundCleanupModule)
 718 };
 719
 720 IMPLEMENT_DYNAMIC_CLASS(wxSoundCleanupModule, wxModule)
 721
 722 #endif