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

   1 /*****************************************************************************
   2  * aout.c: Windows DirectX audio output method
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: directx.c,v 1.3 2002/10/11 10:08:06 gbazin 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 <windows.h>
  38 #include <mmsystem.h>
  39 #include <dsound.h>
  40
  41 #define FRAME_SIZE 2048              /* The size is in samples, not in bytes */
  42
  43 /*****************************************************************************
  44  * DirectSound GUIDs.
  45  * Defining them here allows us to get rid of the dxguid library during
  46  * the linking stage.
  47  *****************************************************************************/
  48 #include <initguid.h>
  49 DEFINE_GUID(IID_IDirectSoundNotify, 0xb0210783, 0x89cd, 0x11d0, 0xaf, 0x8, 0x0, 0xa0, 0xc9, 0x25, 0xcd, 0x16);
  50
  51 /*****************************************************************************
  52  * notification_thread_t: DirectX event thread
  53  *****************************************************************************/
  54 typedef struct notification_thread_t
  55 {
  56     VLC_COMMON_MEMBERS
  57
  58     aout_instance_t * p_aout;
  59     DSBPOSITIONNOTIFY p_events[2];               /* play notification events */
  60     int i_buffer_size;                         /* Size in bytes of one frame */
  61
  62 } notification_thread_t;
  63
  64 /*****************************************************************************
  65  * aout_sys_t: directx audio output method descriptor
  66  *****************************************************************************
  67  * This structure is part of the audio output thread descriptor.
  68  * It describes the direct sound specific properties of an audio device.
  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 int  OpenAudio  ( vlc_object_t * );
  95 static void CloseAudio ( vlc_object_t * );
  96
  97 static void Play       ( aout_instance_t * );
  98
  99 /* local functions */
 100 static int  DirectxCreateSecondaryBuffer ( aout_instance_t * );
 101 static void DirectxDestroySecondaryBuffer( aout_instance_t * );
 102 static int  DirectxInitDSound            ( aout_instance_t * );
 103 static void DirectSoundThread            ( notification_thread_t * );
 104
 105 /*****************************************************************************
 106  * Module descriptor
 107  *****************************************************************************/
 108 vlc_module_begin();
 109     set_description( _("DirectX audio module") );
 110     set_capability( "audio output", 100 );
 111     add_shortcut( "directx" );
 112     set_callbacks( OpenAudio, CloseAudio );
 113 vlc_module_end();
 114
 115 /*****************************************************************************
 116  * OpenAudio: open the audio device
 117  *****************************************************************************
 118  * This function opens and setups Direct Sound.
 119  *****************************************************************************/
 120 static int OpenAudio( vlc_object_t *p_this )
 121 {
 122     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 123     HRESULT dsresult;
 124     DSBUFFERDESC dsbuffer_desc;
 125
 126     msg_Dbg( p_aout, "Open" );
 127
 128    /* Allocate structure */
 129     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 130     if( p_aout->output.p_sys == NULL )
 131     {
 132         msg_Err( p_aout, "out of memory" );
 133         return 1;
 134     }
 135
 136     /* Initialize some variables */
 137     p_aout->output.p_sys->p_dsobject = NULL;
 138     p_aout->output.p_sys->p_dsbuffer_primary = NULL;
 139     p_aout->output.p_sys->p_dsbuffer = NULL;
 140     p_aout->output.p_sys->p_dsnotify = NULL;
 141     p_aout->output.p_sys->p_notif = NULL;
 142     vlc_mutex_init( p_aout, &p_aout->output.p_sys->buffer_lock );
 143
 144     p_aout->output.pf_play = Play;
 145     aout_VolumeSoftInit( p_aout );
 146
 147     /* Initialise DirectSound */
 148     if( DirectxInitDSound( p_aout ) )
 149     {
 150         msg_Err( p_aout, "cannot initialize DirectSound" );
 151         goto error;
 152     }
 153
 154     /* Obtain (not create) Direct Sound primary buffer */
 155     memset( &dsbuffer_desc, 0, sizeof(DSBUFFERDESC) );
 156     dsbuffer_desc.dwSize = sizeof(DSBUFFERDESC);
 157     dsbuffer_desc.dwFlags = DSBCAPS_PRIMARYBUFFER;
 158     msg_Warn( p_aout, "create direct sound primary buffer" );
 159     dsresult = IDirectSound_CreateSoundBuffer(p_aout->output.p_sys->p_dsobject,
 160                                      &dsbuffer_desc,
 161                                      &p_aout->output.p_sys->p_dsbuffer_primary,
 162                                      NULL);
 163     if( dsresult != DS_OK )
 164     {
 165         msg_Err( p_aout, "cannot create direct sound primary buffer" );
 166         goto error;
 167     }
 168
 169     /* Now we need to setup DirectSound play notification */
 170     p_aout->output.p_sys->p_notif =
 171         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 172     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 173
 174     /* first we need to create the notification events */
 175     p_aout->output.p_sys->p_notif->p_events[0].hEventNotify =
 176         CreateEvent( NULL, FALSE, FALSE, NULL );
 177     p_aout->output.p_sys->p_notif->p_events[1].hEventNotify =
 178         CreateEvent( NULL, FALSE, FALSE, NULL );
 179
 180     vlc_mutex_lock( &p_aout->output.p_sys->buffer_lock );
 181
 182     /* then create a new secondary buffer */
 183     if( DirectxCreateSecondaryBuffer( p_aout ) )
 184     {
 185         msg_Err( p_aout, "cannot create buffer" );
 186         vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 187         return 1;
 188     }
 189
 190     vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 191
 192     /* start playing the buffer */
 193     dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 194                                         0,                         /* Unused */
 195                                         0,                         /* Unused */
 196                                         DSBPLAY_LOOPING );          /* Flags */
 197     if( dsresult == DSERR_BUFFERLOST )
 198     {
 199         IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 200         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 201                                             0,                     /* Unused */
 202                                             0,                     /* Unused */
 203                                             DSBPLAY_LOOPING );      /* Flags */
 204     }
 205     if( dsresult != DS_OK )
 206     {
 207         msg_Warn( p_aout, "cannot play buffer" );
 208     }
 209
 210     /* then launch the notification thread */
 211     msg_Dbg( p_aout, "creating DirectSoundThread" );
 212     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 213                            "DirectSound Notification Thread",
 214                            DirectSoundThread, VLC_THREAD_PRIORITY_OUTPUT, 1 ) )
 215     {
 216         msg_Err( p_aout, "cannot create DirectSoundThread" );
 217         goto error;
 218     }
 219
 220     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 221
 222     return 0;
 223
 224  error:
 225     CloseAudio( VLC_OBJECT(p_aout) );
 226     return 1;
 227 }
 228
 229 /*****************************************************************************
 230  * Play: nothing to do
 231  *****************************************************************************/
 232 static void Play( aout_instance_t *p_aout )
 233 {
 234 }
 235
 236 /*****************************************************************************
 237  * CloseAudio: close the audio device
 238  *****************************************************************************/
 239 static void CloseAudio( vlc_object_t *p_this )
 240 {
 241     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 242
 243     msg_Dbg( p_aout, "Close" );
 244
 245     /* kill the position notification thread, if any */
 246     if( p_aout->output.p_sys->p_notif )
 247     {
 248         vlc_object_detach( p_aout->output.p_sys->p_notif );
 249         if( p_aout->output.p_sys->p_notif->b_thread )
 250         {
 251             p_aout->output.p_sys->p_notif->b_die = 1;
 252             vlc_thread_join( p_aout->output.p_sys->p_notif );
 253         }
 254         vlc_object_destroy( p_aout->output.p_sys->p_notif );
 255     }
 256
 257     /* release the secondary buffer */
 258     DirectxDestroySecondaryBuffer( p_aout );
 259
 260     /* then release the primary buffer */
 261     if( p_aout->output.p_sys->p_dsbuffer_primary )
 262         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer_primary );
 263
 264     /* finally release the DirectSound object */
 265     if( p_aout->output.p_sys->p_dsobject )
 266         IDirectSound_Release( p_aout->output.p_sys->p_dsobject );
 267
 268     /* free DSOUND.DLL */
 269     if( p_aout->output.p_sys->hdsound_dll )
 270        FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 271
 272     /* Close the Output. */
 273     if ( p_aout->output.p_sys  )
 274     {
 275         free( p_aout->output.p_sys );
 276         p_aout->output.p_sys = NULL;
 277     }
 278 }
 279
 280 /*****************************************************************************
 281  * DirectxInitDSound: handle all the gory details of DirectSound initialisation
 282  *****************************************************************************/
 283 static int DirectxInitDSound( aout_instance_t *p_aout )
 284 {
 285     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 286
 287     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 288     if( p_aout->output.p_sys->hdsound_dll == NULL )
 289     {
 290         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 291         goto error;
 292     }
 293
 294     OurDirectSoundCreate = (void *)GetProcAddress(
 295                                            p_aout->output.p_sys->hdsound_dll,
 296                                            "DirectSoundCreate" );
 297     if( OurDirectSoundCreate == NULL )
 298     {
 299         msg_Warn( p_aout, "GetProcAddress FAILED" );
 300         goto error;
 301     }
 302
 303     /* Create the direct sound object */
 304     if( OurDirectSoundCreate( NULL, &p_aout->output.p_sys->p_dsobject, NULL )
 305         != DS_OK )
 306     {
 307         msg_Warn( p_aout, "cannot create a direct sound device" );
 308         goto error;
 309     }
 310
 311     /* Set DirectSound Cooperative level, ie what control we want over Windows
 312      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 313      * settings of the primary buffer, but also that only the sound of our
 314      * application will be hearable when it will have the focus.
 315      * !!! (this is not really working as intended yet because to set the
 316      * cooperative level you need the window handle of your application, and
 317      * I don't know of any easy way to get it. Especially since we might play
 318      * sound without any video, and so what window handle should we use ???
 319      * The hack for now is to use the Desktop window handle - it seems to be
 320      * working */
 321     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 322                                           GetDesktopWindow(),
 323                                           DSSCL_EXCLUSIVE) )
 324     {
 325         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 326     }
 327
 328     return 0;
 329
 330  error:
 331     p_aout->output.p_sys->p_dsobject = NULL;
 332     if( p_aout->output.p_sys->hdsound_dll )
 333     {
 334         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 335         p_aout->output.p_sys->hdsound_dll = NULL;
 336     }
 337     return 1;
 338
 339 }
 340
 341 /*****************************************************************************
 342  * DirectxCreateSecondaryBuffer
 343  *****************************************************************************
 344  * This function creates the buffer we'll use to play audio.
 345  * In DirectSound there are two kinds of buffers:
 346  * - the primary buffer: which is the actual buffer that the soundcard plays
 347  * - the secondary buffer(s): these buffers are the one actually used by
 348  *    applications and DirectSound takes care of mixing them into the primary.
 349  *
 350  * Once you create a secondary buffer, you cannot change its format anymore so
 351  * you have to release the current and create another one.
 352  *****************************************************************************/
 353 static int DirectxCreateSecondaryBuffer( aout_instance_t *p_aout )
 354 {
 355     WAVEFORMATEX         waveformat;
 356     DSBUFFERDESC         dsbdesc;
 357     DSBCAPS              dsbcaps;
 358
 359     if( p_aout->output.output.i_channels > 2 )
 360         p_aout->output.output.i_channels = 2;
 361
 362     /* First set the buffer format */
 363     memset(&waveformat, 0, sizeof(WAVEFORMATEX));
 364     waveformat.wFormatTag      = WAVE_FORMAT_PCM;
 365     waveformat.nChannels       = p_aout->output.output.i_channels;
 366     waveformat.nSamplesPerSec  = p_aout->output.output.i_rate;
 367     waveformat.wBitsPerSample  = 16;
 368     waveformat.nBlockAlign     = waveformat.wBitsPerSample / 8 *
 369                                  waveformat.nChannels;
 370     waveformat.nAvgBytesPerSec = waveformat.nSamplesPerSec *
 371                                      waveformat.nBlockAlign;
 372
 373     /* Then fill in the descriptor */
 374     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 375     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 376     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 377                     | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
 378                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 379     dsbdesc.dwBufferBytes = FRAME_SIZE * 2 /* frames*/ *      /* buffer size */
 380                             sizeof(s16) * p_aout->output.output.i_channels;
 381     dsbdesc.lpwfxFormat = &waveformat;
 382
 383     if( IDirectSound_CreateSoundBuffer( p_aout->output.p_sys->p_dsobject,
 384                                         &dsbdesc,
 385                                         &p_aout->output.p_sys->p_dsbuffer,
 386                                         NULL) != DS_OK )
 387     {
 388         msg_Warn( p_aout, "cannot create direct sound secondary buffer" );
 389         goto error;
 390     }
 391
 392     /* backup the size of a frame */
 393     p_aout->output.p_sys->p_notif->i_buffer_size = FRAME_SIZE * sizeof(s16)
 394                                             * p_aout->output.output.i_channels;
 395
 396     memset(&dsbcaps, 0, sizeof(DSBCAPS));
 397     dsbcaps.dwSize = sizeof(DSBCAPS);
 398     IDirectSoundBuffer_GetCaps( p_aout->output.p_sys->p_dsbuffer, &dsbcaps  );
 399     msg_Dbg( p_aout, "requested %li bytes buffer and got %li bytes.",
 400              2 * p_aout->output.p_sys->p_notif->i_buffer_size,
 401              dsbcaps.dwBufferBytes );
 402
 403     /* Now the secondary buffer is created, we need to setup its position
 404      * notification */
 405     p_aout->output.p_sys->p_notif->p_events[0].dwOffset = 0;
 406     p_aout->output.p_sys->p_notif->p_events[1].dwOffset =
 407         p_aout->output.p_sys->p_notif->i_buffer_size;
 408
 409     /* Get the IDirectSoundNotify interface */
 410     if FAILED( IDirectSoundBuffer_QueryInterface(
 411                                 p_aout->output.p_sys->p_dsbuffer,
 412                                 &IID_IDirectSoundNotify,
 413                                 (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
 414     {
 415         msg_Err( p_aout, "cannot get Notify interface" );
 416         goto error;
 417     }
 418
 419     if FAILED( IDirectSoundNotify_SetNotificationPositions(
 420                                     p_aout->output.p_sys->p_dsnotify, 2,
 421                                     p_aout->output.p_sys->p_notif->p_events ) )
 422     {
 423         msg_Err( p_aout, "cannot set position Notification" );
 424         goto error;
 425     }
 426     p_aout->output.output.i_format = AOUT_FMT_S16_NE;
 427     p_aout->output.i_nb_samples = FRAME_SIZE;
 428
 429     return 0;
 430
 431  error:
 432     if( p_aout->output.p_sys->p_dsbuffer )
 433     {
 434         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 435         p_aout->output.p_sys->p_dsbuffer = NULL;
 436     }
 437     if( p_aout->output.p_sys->p_dsnotify )
 438     {
 439         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 440         p_aout->output.p_sys->p_dsnotify = NULL;
 441     }
 442     return 1;
 443 }
 444
 445 /*****************************************************************************
 446  * DirectxCreateSecondaryBuffer
 447  *****************************************************************************
 448  * This function destroys the secondary buffer.
 449  *****************************************************************************/
 450 static void DirectxDestroySecondaryBuffer( aout_instance_t *p_aout )
 451 {
 452     /* make sure the buffer isn't playing */
 453     if( p_aout->output.p_sys->p_dsbuffer )
 454         IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
 455
 456     if( p_aout->output.p_sys->p_dsnotify )
 457     {
 458         IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
 459         p_aout->output.p_sys->p_dsnotify = NULL;
 460     }
 461
 462     if( p_aout->output.p_sys->p_dsbuffer )
 463     {
 464         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 465         p_aout->output.p_sys->p_dsbuffer = NULL;
 466     }
 467 }
 468
 469 /*****************************************************************************
 470  * DirectSoundThread: this thread will capture play notification events.
 471  *****************************************************************************
 472  * We use this thread to emulate a callback mechanism. The thread probes for
 473  * event notification and fills up the DS secondary buffer when needed.
 474  *****************************************************************************/
 475 static void DirectSoundThread( notification_thread_t *p_notif )
 476 {
 477     HANDLE  notification_events[2];
 478     HRESULT dsresult;
 479     aout_instance_t *p_aout = p_notif->p_aout;
 480
 481     notification_events[0] = p_notif->p_events[0].hEventNotify;
 482     notification_events[1] = p_notif->p_events[1].hEventNotify;
 483
 484     /* Tell the main thread that we are ready */
 485     vlc_thread_ready( p_notif );
 486
 487     msg_Dbg( p_notif, "DirectSoundThread ready" );
 488
 489     while( !p_notif->b_die )
 490     {
 491         int i_which_event;
 492         void *p_write_position, *p_wrap_around;
 493         long l_bytes1, l_bytes2;
 494         aout_buffer_t * p_buffer;
 495
 496         /* wait for the position notification */
 497         i_which_event = WaitForMultipleObjects( 2, notification_events, 0,
 498                                                 INFINITE ) - WAIT_OBJECT_0;
 499
 500         vlc_mutex_lock( &p_aout->output.p_sys->buffer_lock );
 501
 502         if( p_notif->b_die )
 503         {
 504             vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 505             break;
 506         }
 507
 508         /* Before copying anything, we have to lock the buffer */
 509         dsresult = IDirectSoundBuffer_Lock(
 510                                                                 /* DS buffer */
 511             p_aout->output.p_sys->p_dsbuffer,
 512                                                      /* Offset of lock start */
 513             i_which_event ? 0 : p_notif->i_buffer_size,
 514             p_notif->i_buffer_size,                 /* Number of bytes */
 515             &p_write_position,                      /* Address of lock start */
 516             &l_bytes1,           /* Count of bytes locked before wrap around */
 517             &p_wrap_around,                /* Buffer adress (if wrap around) */
 518             &l_bytes2,                   /* Count of bytes after wrap around */
 519             0 );                                                    /* Flags */
 520         if( dsresult == DSERR_BUFFERLOST )
 521         {
 522             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 523             dsresult = IDirectSoundBuffer_Lock(
 524                            p_aout->output.p_sys->p_dsbuffer,
 525                            i_which_event ? 0 : p_notif->i_buffer_size,
 526                            p_notif->i_buffer_size,
 527                            &p_write_position,
 528                            &l_bytes1,
 529                            &p_wrap_around,
 530                            &l_bytes2,
 531                            0 );
 532         }
 533         if( dsresult != DS_OK )
 534         {
 535             msg_Warn( p_notif, "cannot lock buffer" );
 536             vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 537             continue;
 538         }
 539
 540         /* We also take into account the latency instead of just mdate() */
 541         p_buffer = aout_OutputNextBuffer( p_aout,
 542             mdate() + 1000000 / p_aout->output.output.i_rate * FRAME_SIZE,
 543             VLC_FALSE );
 544
 545         /* Now do the actual memcpy into the circular buffer */
 546         if ( l_bytes1 != p_notif->i_buffer_size )
 547             msg_Err( p_aout, "Wrong buffer size: %d, %d", l_bytes1,
 548                      p_notif->i_buffer_size );
 549
 550         if ( p_buffer != NULL )
 551         {
 552             p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
 553                                       l_bytes1 );
 554             aout_BufferFree( p_buffer );
 555         }
 556         else
 557         {
 558             memset( p_write_position, 0, l_bytes1 );
 559         }
 560
 561         /* Now the data has been copied, unlock the buffer */
 562         IDirectSoundBuffer_Unlock( p_aout->output.p_sys->p_dsbuffer,
 563                         p_write_position, l_bytes1, p_wrap_around, l_bytes2 );
 564
 565         vlc_mutex_unlock( &p_aout->output.p_sys->buffer_lock );
 566
 567     }
 568
 569     /* free the events */
 570     CloseHandle( notification_events[0] );
 571     CloseHandle( notification_events[1] );
 572
 573     msg_Dbg( p_notif, "DirectSoundThread exiting" );
 574
 575 }