git.sesse.net Git - vlc/blob - modules/video_output/directx/aout.c

   1 /*****************************************************************************
   2  * aout.c: Windows DirectX audio output method
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: aout.c,v 1.9 2002/08/30 23:27:06 massiot Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <errno.h>                                                 /* ENOMEM */
  28 #include <fcntl.h>                                       /* open(), O_WRONLY */
  29 #include <string.h>                                            /* strerror() */
  30
  31 #include <stdlib.h>                            /* calloc(), malloc(), free() */
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc/aout.h>
  35 #include "aout_internal.h"
  36
  37 #include <mmsystem.h>
  38 #include <dsound.h>
  39
  40 #define FRAME_SIZE 2048              /* The size is in samples, not in bytes */
  41
  42 /*****************************************************************************
  43  * DirectSound GUIDs.
  44  * Defining them here allows us to get rid of the dxguid library during
  45  * the linking stage.
  46  *****************************************************************************/
  47 #include <initguid.h>
  48 DEFINE_GUID(IID_IDirectSoundNotify, 0xb0210783, 0x89cd, 0x11d0, 0xaf, 0x8, 0x0, 0xa0, 0xc9, 0x25, 0xcd, 0x16);
  49
  50 /*****************************************************************************
  51  * notification_thread_t: DirectX event thread
  52  *****************************************************************************/
  53 typedef struct notification_thread_t
  54 {
  55     VLC_COMMON_MEMBERS
  56
  57     aout_instance_t * p_aout;
  58     DSBPOSITIONNOTIFY p_events[2];               /* play notification events */
  59     int i_buffer_size;                         /* Size in bytes of one frame */
  60
  61 } notification_thread_t;
  62
  63 /*****************************************************************************
  64  * aout_sys_t: directx audio output method descriptor
  65  *****************************************************************************
  66  * This structure is part of the audio output thread descriptor.
  67  * It describes the direct sound specific properties of an audio device.
  68  *****************************************************************************/
  69
  70 struct aout_sys_t
  71 {
  72     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
  73
  74     LPDIRECTSOUNDBUFFER p_dsbuffer_primary;     /* the actual sound card buffer
  75                                                    (not used directly) */
  76
  77     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
  78                                        * takes care of mixing all the
  79                                        * secondary buffers into the primary) */
  80
  81     LPDIRECTSOUNDNOTIFY p_dsnotify;         /* the position notify interface */
  82
  83     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
  84
  85     vlc_mutex_t buffer_lock;                            /* audio buffer lock */
  86
  87     notification_thread_t * p_notif;                 /* DirectSoundThread id */
  88
  89 };
  90
  91 /*****************************************************************************
  92  * Local prototypes.
  93  *****************************************************************************/
  94 static void Play      ( aout_instance_t * );
  95
  96 /* local functions */
  97 static int  DirectxCreateSecondaryBuffer ( aout_instance_t * );
  98 static void DirectxDestroySecondaryBuffer( aout_instance_t * );
  99 static int  DirectxInitDSound            ( aout_instance_t * );
 100 static void DirectSoundThread            ( notification_thread_t * );
 101
 102 /*****************************************************************************
 103  * OpenAudio: open the audio device
 104  *****************************************************************************
 105  * This function opens and setups Direct Sound.
 106  *****************************************************************************/
 107 int E_(OpenAudio) ( vlc_object_t *p_this )
 108 {
 109     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 110     HRESULT dsresult;
 111     DSBUFFERDESC dsbuffer_desc;
 112
 113     msg_Dbg( p_aout, "Open" );
 114
 115    /* Allocate structure */
 116     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 117     if( p_aout->output.p_sys == NULL )
 118     {
 119         msg_Err( p_aout, "out of memory" );
 120         return 1;
 121     }
 122
 123     /* Initialize some variables */
 124     p_aout->output.p_sys->p_dsobject = NULL;
 125     p_aout->output.p_sys->p_dsbuffer_primary = NULL;
 126     p_aout->output.p_sys->p_dsbuffer = NULL;
 127     p_aout->output.p_sys->p_dsnotify = NULL;
 128     p_aout->output.p_sys->p_notif = NULL;
 129     vlc_mutex_init( p_aout, &p_aout->output.p_sys->buffer_lock );
 130
 131     p_aout->output.pf_play = Play;
 132
 133     /* Initialise DirectSound */
 134     if( DirectxInitDSound( p_aout ) )
 135     {
 136         msg_Err( p_aout, "cannot initialize DirectSound" );
 137         goto error;
 138     }
 139
 140     /* Obtain (not create) Direct Sound primary buffer */
 141     memset( &dsbuffer_desc, 0, sizeof(DSBUFFERDESC) );
 142     dsbuffer_desc.dwSize = sizeof(DSBUFFERDESC);
 143     dsbuffer_desc.dwFlags = DSBCAPS_PRIMARYBUFFER;
 144     msg_Warn( p_aout, "create direct sound primary buffer" );
 145     dsresult = IDirectSound_CreateSoundBuffer(p_aout->output.p_sys->p_dsobject,
 146                                      &dsbuffer_desc,
 147                                      &p_aout->output.p_sys->p_dsbuffer_primary,
 148                                      NULL);
 149     if( dsresult != DS_OK )
 150     {
 151         msg_Err( p_aout, "cannot create direct sound primary buffer" );
 152         goto error;
 153     }
 154
 155     /* Now we need to setup DirectSound play notification */
 156     p_aout->output.p_sys->p_notif =
 157         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 158     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 159
 160     /* first we need to create the notification events */
 161     p_aout->output.p_sys->p_notif->p_events[0].hEventNotify =
 162         CreateEvent( NULL, FALSE, FALSE, NULL );
 163     p_aout->output.p_sys->p_notif->p_events[1].hEventNotify =
 164         CreateEvent( NULL, FALSE, FALSE, NULL );
 165
 166     vlc_mutex_lock( &p_aout->output.p_sys->buffer_lock );
 167
 168     /* first release the current secondary buffer */
 169     DirectxDestroySecondaryBuffer( p_aout );
 170
 171     /* calculate the frame size in bytes */
 172     p_aout->output.p_sys->p_notif->i_buffer_size = FRAME_SIZE * sizeof(s16)
 173                                             * p_aout->output.output.i_channels;
 174
 175     /* then create a new secondary buffer */
 176     if( DirectxCreateSecondaryBuffer( p_aout ) )
 177     {
 178         msg_Err( p_aout, "cannot create buffer" );
 179         vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 180         return 1;
 181     }
 182
 183     vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 184
 185     /* start playing the buffer */
 186     dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 187                                         0,                         /* Unused */
 188                                         0,                         /* Unused */
 189                                         DSBPLAY_LOOPING );          /* Flags */
 190     if( dsresult == DSERR_BUFFERLOST )
 191     {
 192         IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 193         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 194                                             0,                     /* Unused */
 195                                             0,                     /* Unused */
 196                                             DSBPLAY_LOOPING );      /* Flags */
 197     }
 198     if( dsresult != DS_OK )
 199     {
 200         msg_Warn( p_aout, "cannot play buffer" );
 201     }
 202
 203     /* then launch the notification thread */
 204     msg_Dbg( p_aout, "creating DirectSoundThread" );
 205     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 206                            "DirectSound Notification Thread",
 207                            DirectSoundThread, VLC_THREAD_PRIORITY_OUTPUT, 1 ) )
 208     {
 209         msg_Err( p_aout, "cannot create DirectSoundThread" );
 210         goto error;
 211     }
 212
 213     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 214
 215     return 0;
 216
 217  error:
 218     E_(CloseAudio)( VLC_OBJECT(p_aout) );
 219     return 1;
 220 }
 221
 222 /*****************************************************************************
 223  * Play: nothing to do
 224  *****************************************************************************/
 225 static void Play( aout_instance_t *p_aout )
 226 {
 227 }
 228
 229 /*****************************************************************************
 230  * CloseAudio: close the audio device
 231  *****************************************************************************/
 232 void E_(CloseAudio) ( vlc_object_t *p_this )
 233 {
 234     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 235
 236     msg_Dbg( p_aout, "Close" );
 237
 238     /* kill the position notification thread, if any */
 239     if( p_aout->output.p_sys->p_notif )
 240     {
 241         vlc_object_detach( p_aout->output.p_sys->p_notif );
 242         if( p_aout->output.p_sys->p_notif->b_thread )
 243         {
 244             p_aout->output.p_sys->p_notif->b_die = 1;
 245             vlc_thread_join( p_aout->output.p_sys->p_notif );
 246         }
 247         vlc_object_destroy( p_aout->output.p_sys->p_notif );
 248     }
 249
 250     /* release the secondary buffer */
 251     DirectxDestroySecondaryBuffer( p_aout );
 252
 253     /* then release the primary buffer */
 254     if( p_aout->output.p_sys->p_dsbuffer_primary )
 255         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer_primary );
 256
 257     /* finally release the DirectSound object */
 258     if( p_aout->output.p_sys->p_dsobject )
 259         IDirectSound_Release( p_aout->output.p_sys->p_dsobject );
 260
 261     /* free DSOUND.DLL */
 262     if( p_aout->output.p_sys->hdsound_dll )
 263        FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 264
 265     /* Close the Output. */
 266     if ( p_aout->output.p_sys  )
 267     {
 268         free( p_aout->output.p_sys );
 269         p_aout->output.p_sys = NULL;
 270     }
 271 }
 272
 273 /*****************************************************************************
 274  * DirectxInitDSound: handle all the gory details of DirectSound initialisation
 275  *****************************************************************************/
 276 static int DirectxInitDSound( aout_instance_t *p_aout )
 277 {
 278     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 279
 280     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 281     if( p_aout->output.p_sys->hdsound_dll == NULL )
 282     {
 283         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 284         goto error;
 285     }
 286
 287     OurDirectSoundCreate = (void *)GetProcAddress(
 288                                            p_aout->output.p_sys->hdsound_dll,
 289                                            "DirectSoundCreate" );
 290     if( OurDirectSoundCreate == NULL )
 291     {
 292         msg_Warn( p_aout, "GetProcAddress FAILED" );
 293         goto error;
 294     }
 295
 296     /* Create the direct sound object */
 297     if( OurDirectSoundCreate( NULL, &p_aout->output.p_sys->p_dsobject, NULL )
 298         != DS_OK )
 299     {
 300         msg_Warn( p_aout, "cannot create a direct sound device" );
 301         goto error;
 302     }
 303
 304     /* Set DirectSound Cooperative level, ie what control we want over Windows
 305      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 306      * settings of the primary buffer, but also that only the sound of our
 307      * application will be hearable when it will have the focus.
 308      * !!! (this is not really working as intended yet because to set the
 309      * cooperative level you need the window handle of your application, and
 310      * I don't know of any easy way to get it. Especially since we might play
 311      * sound without any video, and so what window handle should we use ???
 312      * The hack for now is to use the Desktop window handle - it seems to be
 313      * working */
 314     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 315                                           GetDesktopWindow(),
 316                                           DSSCL_EXCLUSIVE) )
 317     {
 318         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 319     }
 320
 321     return 0;
 322
 323  error:
 324     p_aout->output.p_sys->p_dsobject = NULL;
 325     if( p_aout->output.p_sys->hdsound_dll )
 326     {
 327         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 328         p_aout->output.p_sys->hdsound_dll = NULL;
 329     }
 330     return 1;
 331
 332 }
 333
 334 /*****************************************************************************
 335  * DirectxCreateSecondaryBuffer
 336  *****************************************************************************
 337  * This function creates the buffer we'll use to play audio.
 338  * In DirectSound there are two kinds of buffers:
 339  * - the primary buffer: which is the actual buffer that the soundcard plays
 340  * - the secondary buffer(s): these buffers are the one actually used by
 341  *    applications and DirectSound takes care of mixing them into the primary.
 342  *
 343  * Once you create a secondary buffer, you cannot change its format anymore so
 344  * you have to release the current and create another one.
 345  *****************************************************************************/
 346 static int DirectxCreateSecondaryBuffer( aout_instance_t *p_aout )
 347 {
 348     WAVEFORMATEX         waveformat;
 349     DSBUFFERDESC         dsbdesc;
 350     DSBCAPS              dsbcaps;
 351
 352     /* First set the buffer format */
 353     memset(&waveformat, 0, sizeof(WAVEFORMATEX));
 354     waveformat.wFormatTag      = WAVE_FORMAT_PCM;
 355     waveformat.nChannels       = p_aout->output.output.i_channels;
 356     waveformat.nSamplesPerSec  = p_aout->output.output.i_rate;
 357     waveformat.wBitsPerSample  = 16;
 358     waveformat.nBlockAlign     = waveformat.wBitsPerSample / 8 *
 359                                  waveformat.nChannels;
 360     waveformat.nAvgBytesPerSec = waveformat.nSamplesPerSec *
 361                                      waveformat.nBlockAlign;
 362
 363     /* Then fill in the descriptor */
 364     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 365     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 366     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 367                     | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
 368                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 369     dsbdesc.dwBufferBytes = FRAME_SIZE * 2 /* frames*/ *      /* buffer size */
 370                             sizeof(s16) * p_aout->output.output.i_channels;
 371     dsbdesc.lpwfxFormat = &waveformat;
 372
 373     if( IDirectSound_CreateSoundBuffer( p_aout->output.p_sys->p_dsobject,
 374                                         &dsbdesc,
 375                                         &p_aout->output.p_sys->p_dsbuffer,
 376                                         NULL) != DS_OK )
 377     {
 378         msg_Warn( p_aout, "cannot create direct sound secondary buffer" );
 379         goto error;
 380     }
 381
 382     /* backup the size of the secondary sound buffer */
 383     memset(&dsbcaps, 0, sizeof(DSBCAPS));
 384     dsbcaps.dwSize = sizeof(DSBCAPS);
 385     IDirectSoundBuffer_GetCaps( p_aout->output.p_sys->p_dsbuffer, &dsbcaps  );
 386
 387     msg_Dbg( p_aout, "DirectxCreateSecondaryBuffer: %li",
 388              dsbcaps.dwBufferBytes );
 389
 390     /* Now the secondary buffer is created, we need to setup its position
 391      * notification */
 392     p_aout->output.p_sys->p_notif->p_events[0].dwOffset = 0;
 393     p_aout->output.p_sys->p_notif->p_events[1].dwOffset =
 394         p_aout->output.p_sys->p_notif->i_buffer_size;
 395
 396     /* Get the IDirectSoundNotify interface */
 397     if FAILED( IDirectSoundBuffer_QueryInterface(
 398                                 p_aout->output.p_sys->p_dsbuffer,
 399                                 &IID_IDirectSoundNotify,
 400                                 (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
 401     {
 402         msg_Warn( p_aout, "cannot get Notify interface" );
 403         goto error;
 404     }
 405
 406     if FAILED( IDirectSoundNotify_SetNotificationPositions(
 407                                     p_aout->output.p_sys->p_dsnotify, 2,
 408                                     p_aout->output.p_sys->p_notif->p_events ) )
 409     {
 410         msg_Warn( p_aout, "cannot set position Notification" );
 411         goto error;
 412     }
 413
 414     p_aout->output.output.i_format = AOUT_FMT_S16_NE;
 415     p_aout->output.i_nb_samples = FRAME_SIZE;
 416
 417     return 0;
 418
 419  error:
 420     if( p_aout->output.p_sys->p_dsbuffer )
 421     {
 422         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 423         p_aout->output.p_sys->p_dsbuffer = NULL;
 424     }
 425     if( p_aout->output.p_sys->p_dsnotify )
 426     {
 427         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 428         p_aout->output.p_sys->p_dsnotify = NULL;
 429     }
 430     return 1;
 431 }
 432
 433 /*****************************************************************************
 434  * DirectxCreateSecondaryBuffer
 435  *****************************************************************************
 436  * This function destroys the secondary buffer.
 437  *****************************************************************************/
 438 static void DirectxDestroySecondaryBuffer( aout_instance_t *p_aout )
 439 {
 440     /* make sure the buffer isn't playing */
 441     if( p_aout->output.p_sys->p_dsbuffer )
 442         IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
 443
 444     if( p_aout->output.p_sys->p_dsnotify )
 445     {
 446         IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
 447         p_aout->output.p_sys->p_dsnotify = NULL;
 448     }
 449
 450     if( p_aout->output.p_sys->p_dsbuffer )
 451     {
 452         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 453         p_aout->output.p_sys->p_dsbuffer = NULL;
 454     }
 455 }
 456
 457 /*****************************************************************************
 458  * DirectSoundThread: this thread will capture play notification events.
 459  *****************************************************************************
 460  * We use this thread to emulate a callback mechanism. The thread probes for
 461  * event notification and fills up the DS secondary buffer when needed.
 462  *****************************************************************************/
 463 static void DirectSoundThread( notification_thread_t *p_notif )
 464 {
 465     HANDLE  notification_events[2];
 466     HRESULT dsresult;
 467     aout_instance_t *p_aout = p_notif->p_aout;
 468
 469     notification_events[0] = p_notif->p_events[0].hEventNotify;
 470     notification_events[1] = p_notif->p_events[1].hEventNotify;
 471
 472     /* Tell the main thread that we are ready */
 473     vlc_thread_ready( p_notif );
 474
 475     /* this thread must be high-priority */
 476     if( !SetThreadPriority( GetCurrentThread(),
 477                             THREAD_PRIORITY_ABOVE_NORMAL ) )
 478     {
 479         msg_Warn( p_notif, "DirectSoundThread could not raise its priority" );
 480     }
 481
 482     msg_Dbg( p_notif, "DirectSoundThread ready" );
 483
 484     while( !p_notif->b_die )
 485     {
 486         int i_which_event;
 487         void *p_write_position, *p_wrap_around;
 488         long l_bytes1, l_bytes2;
 489         aout_buffer_t * p_buffer;
 490
 491         /* wait for the position notification */
 492         i_which_event = WaitForMultipleObjects( 2, notification_events, 0,
 493                                                 INFINITE ) - WAIT_OBJECT_0;
 494
 495         vlc_mutex_lock( &p_aout->output.p_sys->buffer_lock );
 496
 497         if( p_notif->b_die )
 498         {
 499             vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 500             break;
 501         }
 502
 503         /* Before copying anything, we have to lock the buffer */
 504         dsresult = IDirectSoundBuffer_Lock(
 505                                                                 /* DS buffer */
 506             p_aout->output.p_sys->p_dsbuffer,
 507                                                      /* Offset of lock start */
 508             i_which_event ? 0 : p_notif->i_buffer_size,
 509             p_notif->i_buffer_size,                 /* Number of bytes */
 510             &p_write_position,                      /* Address of lock start */
 511             &l_bytes1,           /* Count of bytes locked before wrap around */
 512             &p_wrap_around,                /* Buffer adress (if wrap around) */
 513             &l_bytes2,                   /* Count of bytes after wrap around */
 514             0 );                                                    /* Flags */
 515         if( dsresult == DSERR_BUFFERLOST )
 516         {
 517             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 518             dsresult = IDirectSoundBuffer_Lock(
 519                            p_aout->output.p_sys->p_dsbuffer,
 520                            i_which_event ? 0 : p_notif->i_buffer_size,
 521                            p_notif->i_buffer_size,
 522                            &p_write_position,
 523                            &l_bytes1,
 524                            &p_wrap_around,
 525                            &l_bytes2,
 526                            0 );
 527         }
 528         if( dsresult != DS_OK )
 529         {
 530             msg_Warn( p_notif, "cannot lock buffer" );
 531             vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 532             continue;
 533         }
 534
 535         /* FIXME : take into account DirectSound latency instead of mdate() */
 536         p_buffer = aout_OutputNextBuffer( p_aout, mdate(), VLC_FALSE );
 537
 538         /* Now do the actual memcpy into the circular buffer */
 539         if ( l_bytes1 != p_notif->i_buffer_size )
 540             msg_Err( p_aout, "Wrong buffer size: %d, %d", l_bytes1,
 541                      p_notif->i_buffer_size );
 542
 543         if ( p_buffer != NULL )
 544         {
 545             p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
 546                                       l_bytes1 );
 547             aout_BufferFree( p_buffer );
 548         }
 549         else
 550         {
 551             memset( p_write_position, 0, l_bytes1 );
 552         }
 553
 554         /* Now the data has been copied, unlock the buffer */
 555         IDirectSoundBuffer_Unlock( p_aout->output.p_sys->p_dsbuffer,
 556                         p_write_position, l_bytes1, p_wrap_around, l_bytes2 );
 557
 558         vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 559
 560     }
 561
 562     /* free the events */
 563     CloseHandle( notification_events[0] );
 564     CloseHandle( notification_events[1] );
 565
 566     msg_Dbg( p_notif, "DirectSoundThread exiting" );
 567
 568 }