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

   1 /*****************************************************************************
   2  * directx.c: Windows DirectX audio output method
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: directx.c,v 1.8 2002/11/15 16:27:10 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 #define FRAMES_NUM 4
  43
  44 /* frame buffer status */
  45 #define FRAME_QUEUED 0
  46 #define FRAME_EMPTY 1
  47
  48 /*****************************************************************************
  49  * DirectSound GUIDs.
  50  * Defining them here allows us to get rid of the dxguid library during
  51  * the linking stage.
  52  *****************************************************************************/
  53 #include <initguid.h>
  54 DEFINE_GUID(IID_IDirectSoundNotify, 0xb0210783, 0x89cd, 0x11d0, 0xaf, 0x8, 0x0, 0xa0, 0xc9, 0x25, 0xcd, 0x16);
  55
  56 /*****************************************************************************
  57  * Useful macros
  58  *****************************************************************************/
  59 #ifndef WAVE_FORMAT_IEEE_FLOAT
  60 #   define WAVE_FORMAT_IEEE_FLOAT 0x0003
  61 #endif
  62
  63 /*****************************************************************************
  64  * notification_thread_t: DirectX event thread
  65  *****************************************************************************/
  66 typedef struct notification_thread_t
  67 {
  68     VLC_COMMON_MEMBERS
  69
  70     aout_instance_t * p_aout;
  71     int i_frame_status[FRAMES_NUM];           /* status of each frame buffer */
  72     DSBPOSITIONNOTIFY p_events[FRAMES_NUM];      /* play notification events */
  73     int i_frame_size;                         /* Size in bytes of one frame */
  74
  75     mtime_t start_date;
  76
  77 } notification_thread_t;
  78
  79 /*****************************************************************************
  80  * aout_sys_t: directx audio output method descriptor
  81  *****************************************************************************
  82  * This structure is part of the audio output thread descriptor.
  83  * It describes the direct sound specific properties of an audio device.
  84  *****************************************************************************/
  85 struct aout_sys_t
  86 {
  87     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
  88
  89     LPDIRECTSOUNDBUFFER p_dsbuffer_primary;     /* the actual sound card buffer
  90                                                    (not used directly) */
  91
  92     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
  93                                        * takes care of mixing all the
  94                                        * secondary buffers into the primary) */
  95
  96     LPDIRECTSOUNDNOTIFY p_dsnotify;         /* the position notify interface */
  97
  98     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
  99
 100     notification_thread_t * p_notif;                 /* DirectSoundThread id */
 101
 102     int b_playing;                                         /* playing status */
 103 };
 104
 105 /*****************************************************************************
 106  * Local prototypes.
 107  *****************************************************************************/
 108 static int  OpenAudio  ( vlc_object_t * );
 109 static void CloseAudio ( vlc_object_t * );
 110
 111 static void Play       ( aout_instance_t * );
 112
 113 /* local functions */
 114 static int  DirectxCreateSecondaryBuffer ( aout_instance_t * );
 115 static void DirectxDestroySecondaryBuffer( aout_instance_t * );
 116 static int  DirectxInitDSound            ( aout_instance_t * );
 117 static void DirectSoundThread            ( notification_thread_t * );
 118 static int  DirectxFillBuffer            ( aout_instance_t *, int,
 119                                            aout_buffer_t * );
 120
 121 /*****************************************************************************
 122  * Module descriptor
 123  *****************************************************************************/
 124 vlc_module_begin();
 125     set_description( _("DirectX audio module") );
 126     set_capability( "audio output", 100 );
 127     add_shortcut( "directx" );
 128     set_callbacks( OpenAudio, CloseAudio );
 129 vlc_module_end();
 130
 131 /*****************************************************************************
 132  * OpenAudio: open the audio device
 133  *****************************************************************************
 134  * This function opens and setups Direct Sound.
 135  *****************************************************************************/
 136 static int OpenAudio( vlc_object_t *p_this )
 137 {
 138     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 139     HRESULT dsresult;
 140     DSBUFFERDESC dsbuffer_desc;
 141     int i;
 142
 143     msg_Dbg( p_aout, "Open" );
 144
 145    /* Allocate structure */
 146     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 147     if( p_aout->output.p_sys == NULL )
 148     {
 149         msg_Err( p_aout, "out of memory" );
 150         return VLC_EGENERIC;
 151     }
 152
 153     /* Initialize some variables */
 154     p_aout->output.p_sys->p_dsobject = NULL;
 155     p_aout->output.p_sys->p_dsbuffer_primary = NULL;
 156     p_aout->output.p_sys->p_dsbuffer = NULL;
 157     p_aout->output.p_sys->p_dsnotify = NULL;
 158     p_aout->output.p_sys->p_notif = NULL;
 159     p_aout->output.p_sys->b_playing = 0;
 160
 161     p_aout->output.pf_play = Play;
 162     aout_VolumeSoftInit( p_aout );
 163
 164     /* Initialise DirectSound */
 165     if( DirectxInitDSound( p_aout ) )
 166     {
 167         msg_Err( p_aout, "cannot initialize DirectSound" );
 168         goto error;
 169     }
 170
 171     /* Obtain (not create) Direct Sound primary buffer */
 172     memset( &dsbuffer_desc, 0, sizeof(DSBUFFERDESC) );
 173     dsbuffer_desc.dwSize = sizeof(DSBUFFERDESC);
 174     dsbuffer_desc.dwFlags = DSBCAPS_PRIMARYBUFFER;
 175     msg_Warn( p_aout, "create direct sound primary buffer" );
 176     dsresult = IDirectSound_CreateSoundBuffer(p_aout->output.p_sys->p_dsobject,
 177                                      &dsbuffer_desc,
 178                                      &p_aout->output.p_sys->p_dsbuffer_primary,
 179                                      NULL);
 180     if( dsresult != DS_OK )
 181     {
 182         msg_Err( p_aout, "cannot create direct sound primary buffer" );
 183         goto error;
 184     }
 185
 186     /* Now we need to setup DirectSound play notification */
 187     p_aout->output.p_sys->p_notif =
 188         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 189     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 190
 191     /* first we need to create the notification events */
 192     for( i = 0; i < FRAMES_NUM; i++ )
 193         p_aout->output.p_sys->p_notif->p_events[i].hEventNotify =
 194             CreateEvent( NULL, FALSE, FALSE, NULL );
 195
 196     /* then create a new secondary buffer */
 197     p_aout->output.output.i_format = VLC_FOURCC('f','l','3','2');
 198     if( DirectxCreateSecondaryBuffer( p_aout ) )
 199     {
 200         msg_Err( p_aout, "cannot create WAVE_FORMAT_IEEE_FLOAT buffer" );
 201
 202         p_aout->output.output.i_format = VLC_FOURCC('s','1','6','l');
 203         if( DirectxCreateSecondaryBuffer( p_aout ) )
 204         {
 205             msg_Err( p_aout, "cannot create WAVE_FORMAT_PCM buffer" );
 206             return 1;
 207         }
 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,
 215                            THREAD_PRIORITY_TIME_CRITICAL, 1 ) )
 216     {
 217         msg_Err( p_aout, "cannot create DirectSoundThread" );
 218         goto error;
 219     }
 220
 221     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 222
 223     return 0;
 224
 225  error:
 226     CloseAudio( VLC_OBJECT(p_aout) );
 227     return VLC_EGENERIC;
 228 }
 229
 230 /*****************************************************************************
 231  * Play: we'll start playing the directsound buffer here because at least here
 232  *       we know the first buffer has been put in the aout fifo and we also
 233  *       know its date.
 234  *****************************************************************************/
 235 static void Play( aout_instance_t *p_aout )
 236 {
 237     if( !p_aout->output.p_sys->b_playing )
 238     {
 239         aout_buffer_t *p_buffer;
 240
 241         p_aout->output.p_sys->b_playing = 1;
 242
 243         /* get the playing date of the first aout buffer */
 244         p_aout->output.p_sys->p_notif->start_date =
 245             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 246
 247         /* fill in the first samples */
 248         p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 249         DirectxFillBuffer( p_aout, 0, p_buffer );
 250
 251         /* wake up the audio output thread */
 252         SetEvent( p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 253     }
 254 }
 255
 256 /*****************************************************************************
 257  * CloseAudio: close the audio device
 258  *****************************************************************************/
 259 static void CloseAudio( vlc_object_t *p_this )
 260 {
 261     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 262
 263     msg_Dbg( p_aout, "Close" );
 264
 265     /* kill the position notification thread, if any */
 266     if( p_aout->output.p_sys->p_notif )
 267     {
 268         vlc_object_detach( p_aout->output.p_sys->p_notif );
 269         if( p_aout->output.p_sys->p_notif->b_thread )
 270         {
 271             p_aout->output.p_sys->p_notif->b_die = 1;
 272
 273             if( !p_aout->output.p_sys->b_playing )
 274                 /* wake up the audio thread */
 275                 SetEvent(
 276                     p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 277
 278             vlc_thread_join( p_aout->output.p_sys->p_notif );
 279         }
 280         vlc_object_destroy( p_aout->output.p_sys->p_notif );
 281     }
 282
 283     /* release the secondary buffer */
 284     DirectxDestroySecondaryBuffer( p_aout );
 285
 286     /* then release the primary buffer */
 287     if( p_aout->output.p_sys->p_dsbuffer_primary )
 288         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer_primary );
 289
 290     /* finally release the DirectSound object */
 291     if( p_aout->output.p_sys->p_dsobject )
 292         IDirectSound_Release( p_aout->output.p_sys->p_dsobject );
 293
 294     /* free DSOUND.DLL */
 295     if( p_aout->output.p_sys->hdsound_dll )
 296        FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 297
 298     free( p_aout->output.p_sys );
 299 }
 300
 301 /*****************************************************************************
 302  * DirectxInitDSound: handle all the gory details of DirectSound initialisation
 303  *****************************************************************************/
 304 static int DirectxInitDSound( aout_instance_t *p_aout )
 305 {
 306     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 307
 308     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 309     if( p_aout->output.p_sys->hdsound_dll == NULL )
 310     {
 311         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 312         goto error;
 313     }
 314
 315     OurDirectSoundCreate = (void *)GetProcAddress(
 316                                            p_aout->output.p_sys->hdsound_dll,
 317                                            "DirectSoundCreate" );
 318     if( OurDirectSoundCreate == NULL )
 319     {
 320         msg_Warn( p_aout, "GetProcAddress FAILED" );
 321         goto error;
 322     }
 323
 324     /* Create the direct sound object */
 325     if( OurDirectSoundCreate( NULL, &p_aout->output.p_sys->p_dsobject, NULL )
 326         != DS_OK )
 327     {
 328         msg_Warn( p_aout, "cannot create a direct sound device" );
 329         goto error;
 330     }
 331
 332     /* Set DirectSound Cooperative level, ie what control we want over Windows
 333      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 334      * settings of the primary buffer, but also that only the sound of our
 335      * application will be hearable when it will have the focus.
 336      * !!! (this is not really working as intended yet because to set the
 337      * cooperative level you need the window handle of your application, and
 338      * I don't know of any easy way to get it. Especially since we might play
 339      * sound without any video, and so what window handle should we use ???
 340      * The hack for now is to use the Desktop window handle - it seems to be
 341      * working */
 342     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 343                                           GetDesktopWindow(),
 344                                           DSSCL_EXCLUSIVE) )
 345     {
 346         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 347     }
 348
 349     return 0;
 350
 351  error:
 352     p_aout->output.p_sys->p_dsobject = NULL;
 353     if( p_aout->output.p_sys->hdsound_dll )
 354     {
 355         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 356         p_aout->output.p_sys->hdsound_dll = NULL;
 357     }
 358     return 1;
 359
 360 }
 361
 362 /*****************************************************************************
 363  * DirectxCreateSecondaryBuffer
 364  *****************************************************************************
 365  * This function creates the buffer we'll use to play audio.
 366  * In DirectSound there are two kinds of buffers:
 367  * - the primary buffer: which is the actual buffer that the soundcard plays
 368  * - the secondary buffer(s): these buffers are the one actually used by
 369  *    applications and DirectSound takes care of mixing them into the primary.
 370  *
 371  * Once you create a secondary buffer, you cannot change its format anymore so
 372  * you have to release the current and create another one.
 373  *****************************************************************************/
 374 static int DirectxCreateSecondaryBuffer( aout_instance_t *p_aout )
 375 {
 376     WAVEFORMATEX         waveformat;
 377     DSBUFFERDESC         dsbdesc;
 378     DSBCAPS              dsbcaps;
 379     int                  i_nb_channels, i;
 380
 381     i_nb_channels = aout_FormatNbChannels( &p_aout->output.output );
 382     if ( i_nb_channels >= 2 )
 383     {
 384         i_nb_channels = 2;
 385         p_aout->output.output.i_physical_channels =
 386             AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 387     }
 388     else
 389     {
 390         i_nb_channels = 1;
 391         p_aout->output.output.i_physical_channels =
 392             AOUT_CHAN_CENTER;
 393     }
 394
 395     /* First set the buffer format */
 396     memset( &waveformat, 0, sizeof(WAVEFORMATEX) );
 397     switch( p_aout->output.output.i_format )
 398     {
 399     case VLC_FOURCC('s','1','6','l'):
 400         waveformat.wFormatTag     = WAVE_FORMAT_PCM;
 401         waveformat.wBitsPerSample = 16;
 402         break;
 403     case VLC_FOURCC('f','l','3','2'):
 404         waveformat.wFormatTag     = WAVE_FORMAT_IEEE_FLOAT;
 405         waveformat.wBitsPerSample = sizeof(float) * 8;
 406         break;
 407     }
 408     waveformat.nChannels       = i_nb_channels;
 409     waveformat.nSamplesPerSec  = p_aout->output.output.i_rate;
 410     waveformat.nBlockAlign     = waveformat.wBitsPerSample / 8 *
 411                                  waveformat.nChannels;
 412     waveformat.nAvgBytesPerSec = waveformat.nSamplesPerSec *
 413                                      waveformat.nBlockAlign;
 414
 415     aout_FormatPrepare( &p_aout->output.output );
 416
 417     /* Then fill in the descriptor */
 418     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 419     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 420     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 421                     | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
 422                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 423     dsbdesc.dwBufferBytes = FRAME_SIZE * FRAMES_NUM           /* buffer size */
 424                             * p_aout->output.output.i_bytes_per_frame;
 425     dsbdesc.lpwfxFormat = &waveformat;
 426
 427     if( IDirectSound_CreateSoundBuffer( p_aout->output.p_sys->p_dsobject,
 428                                         &dsbdesc,
 429                                         &p_aout->output.p_sys->p_dsbuffer,
 430                                         NULL) != DS_OK )
 431     {
 432         msg_Warn( p_aout, "cannot create direct sound secondary buffer" );
 433         goto error;
 434     }
 435
 436     /* backup the size of a frame */
 437     p_aout->output.p_sys->p_notif->i_frame_size = FRAME_SIZE *
 438         p_aout->output.output.i_bytes_per_frame;
 439
 440     memset(&dsbcaps, 0, sizeof(DSBCAPS));
 441     dsbcaps.dwSize = sizeof(DSBCAPS);
 442     IDirectSoundBuffer_GetCaps( p_aout->output.p_sys->p_dsbuffer, &dsbcaps  );
 443     msg_Dbg( p_aout, "requested %li bytes buffer and got %li bytes.",
 444              FRAMES_NUM * p_aout->output.p_sys->p_notif->i_frame_size,
 445              dsbcaps.dwBufferBytes );
 446
 447     /* Now the secondary buffer is created, we need to setup its position
 448      * notification */
 449     for( i = 0; i < FRAMES_NUM; i++ )
 450     {
 451         p_aout->output.p_sys->p_notif->p_events[i].dwOffset = i *
 452             p_aout->output.p_sys->p_notif->i_frame_size;
 453
 454         p_aout->output.p_sys->p_notif->i_frame_status[i] = FRAME_EMPTY;
 455     }
 456
 457     /* Get the IDirectSoundNotify interface */
 458     if FAILED( IDirectSoundBuffer_QueryInterface(
 459                                 p_aout->output.p_sys->p_dsbuffer,
 460                                 &IID_IDirectSoundNotify,
 461                                 (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
 462     {
 463         msg_Err( p_aout, "cannot get Notify interface" );
 464         goto error;
 465     }
 466
 467     if FAILED( IDirectSoundNotify_SetNotificationPositions(
 468                                     p_aout->output.p_sys->p_dsnotify,
 469                                     FRAMES_NUM,
 470                                     p_aout->output.p_sys->p_notif->p_events ) )
 471     {
 472         msg_Err( p_aout, "cannot set position Notification" );
 473         goto error;
 474     }
 475
 476     p_aout->output.i_nb_samples = FRAME_SIZE;
 477
 478     return 0;
 479
 480  error:
 481     if( p_aout->output.p_sys->p_dsbuffer )
 482     {
 483         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 484         p_aout->output.p_sys->p_dsbuffer = NULL;
 485     }
 486     if( p_aout->output.p_sys->p_dsnotify )
 487     {
 488         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 489         p_aout->output.p_sys->p_dsnotify = NULL;
 490     }
 491     return VLC_EGENERIC;
 492 }
 493
 494 /*****************************************************************************
 495  * DirectxCreateSecondaryBuffer
 496  *****************************************************************************
 497  * This function destroys the secondary buffer.
 498  *****************************************************************************/
 499 static void DirectxDestroySecondaryBuffer( aout_instance_t *p_aout )
 500 {
 501     /* make sure the buffer isn't playing */
 502     if( p_aout->output.p_sys->p_dsbuffer )
 503         IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
 504
 505     if( p_aout->output.p_sys->p_dsnotify )
 506     {
 507         IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
 508         p_aout->output.p_sys->p_dsnotify = NULL;
 509     }
 510
 511     if( p_aout->output.p_sys->p_dsbuffer )
 512     {
 513         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 514         p_aout->output.p_sys->p_dsbuffer = NULL;
 515     }
 516 }
 517
 518 /*****************************************************************************
 519  * DirectxFillBuffer: Fill in one of the direct sound frame buffers.
 520  *****************************************************************************
 521  * Returns VLC_SUCCESS on success.
 522  *****************************************************************************/
 523 static int DirectxFillBuffer( aout_instance_t *p_aout, int i_frame,
 524                               aout_buffer_t *p_buffer )
 525 {
 526     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 527     void *p_write_position, *p_wrap_around;
 528     long l_bytes1, l_bytes2;
 529     HRESULT dsresult;
 530
 531     /* Before copying anything, we have to lock the buffer */
 532     dsresult = IDirectSoundBuffer_Lock(
 533                 p_aout->output.p_sys->p_dsbuffer,               /* DS buffer */
 534                 i_frame * p_notif->i_frame_size,             /* Start offset */
 535                 p_notif->i_frame_size,                    /* Number of bytes */
 536                 &p_write_position,                  /* Address of lock start */
 537                 &l_bytes1,       /* Count of bytes locked before wrap around */
 538                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 539                 &l_bytes2,               /* Count of bytes after wrap around */
 540                 0 );                                                /* Flags */
 541     if( dsresult == DSERR_BUFFERLOST )
 542     {
 543         IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 544         dsresult = IDirectSoundBuffer_Lock(
 545                                p_aout->output.p_sys->p_dsbuffer,
 546                                i_frame * p_notif->i_frame_size,
 547                                p_notif->i_frame_size,
 548                                &p_write_position,
 549                                &l_bytes1,
 550                                &p_wrap_around,
 551                                &l_bytes2,
 552                                0 );
 553     }
 554     if( dsresult != DS_OK )
 555     {
 556         msg_Warn( p_notif, "cannot lock buffer" );
 557         if( p_buffer ) aout_BufferFree( p_buffer );
 558         return VLC_EGENERIC;
 559     }
 560
 561     if ( p_buffer != NULL )
 562     {
 563         p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
 564                                   l_bytes1 );
 565         aout_BufferFree( p_buffer );
 566     }
 567     else
 568         memset( p_write_position, 0, l_bytes1 );
 569
 570     /* Now the data has been copied, unlock the buffer */
 571     IDirectSoundBuffer_Unlock( p_aout->output.p_sys->p_dsbuffer,
 572                                p_write_position, l_bytes1,
 573                                p_wrap_around, l_bytes2 );
 574
 575     return VLC_SUCCESS;
 576 }
 577
 578 /*****************************************************************************
 579  * DirectSoundThread: this thread will capture play notification events.
 580  *****************************************************************************
 581  * We use this thread to emulate a callback mechanism. The thread probes for
 582  * event notification and fills up the DS secondary buffer when needed.
 583  *****************************************************************************/
 584 static void DirectSoundThread( notification_thread_t *p_notif )
 585 {
 586     HANDLE  notification_events[FRAMES_NUM];
 587     HRESULT dsresult;
 588     aout_instance_t *p_aout = p_notif->p_aout;
 589     int i, i_which_frame, i_last_frame, i_next_frame;
 590     mtime_t mtime;
 591
 592     for( i = 0; i < FRAMES_NUM; i++ )
 593         notification_events[i] = p_notif->p_events[i].hEventNotify;
 594
 595     /* Tell the main thread that we are ready */
 596     vlc_thread_ready( p_notif );
 597
 598     msg_Dbg( p_notif, "DirectSoundThread ready" );
 599
 600     /* Wait here until Play() is called */
 601     WaitForSingleObject( notification_events[0], INFINITE );
 602
 603     if( !p_notif->b_die )
 604     {
 605         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
 606
 607         /* start playing the buffer */
 608         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 609                                         0,                         /* Unused */
 610                                         0,                         /* Unused */
 611                                         DSBPLAY_LOOPING );          /* Flags */
 612         if( dsresult == DSERR_BUFFERLOST )
 613         {
 614             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 615             dsresult = IDirectSoundBuffer_Play(
 616                                             p_aout->output.p_sys->p_dsbuffer,
 617                                             0,                     /* Unused */
 618                                             0,                     /* Unused */
 619                                             DSBPLAY_LOOPING );      /* Flags */
 620         }
 621         if( dsresult != DS_OK )
 622         {
 623             msg_Err( p_aout, "cannot start playing buffer" );
 624         }
 625     }
 626
 627     while( !p_notif->b_die )
 628     {
 629         aout_buffer_t *p_buffer;
 630         long l_latency;
 631
 632         /* wait for the position notification */
 633         i_which_frame = WaitForMultipleObjects( FRAMES_NUM,
 634                                                 notification_events, 0,
 635                                                 INFINITE ) - WAIT_OBJECT_0;
 636
 637         if( p_notif->b_die )
 638             break;
 639
 640         mtime = mdate();
 641
 642         /* We take into account the current latency */
 643         if( IDirectSoundBuffer_GetCurrentPosition(
 644                 p_aout->output.p_sys->p_dsbuffer,
 645                 &l_latency, NULL ) == DS_OK )
 646         {
 647             if( l_latency > (i_which_frame * FRAME_SIZE)
 648                   && l_latency < ((i_which_frame+1) * FRAME_SIZE) )
 649             {
 650                 l_latency = - ( l_latency /
 651                                 p_aout->output.output.i_bytes_per_frame %
 652                                 FRAME_SIZE );
 653             }
 654             else
 655             {
 656                 l_latency = FRAME_SIZE - ( l_latency /
 657                                       p_aout->output.output.i_bytes_per_frame %
 658                                       FRAME_SIZE );
 659             }
 660         }
 661         else
 662         {
 663             l_latency = 0;
 664         }
 665
 666         /* Mark last frame as empty */
 667         i_last_frame = (i_which_frame + FRAMES_NUM -1) % FRAMES_NUM;
 668         i_next_frame = (i_which_frame + 1) % FRAMES_NUM;
 669         p_notif->i_frame_status[i_last_frame] = FRAME_EMPTY;
 670
 671         /* Try to fill in as many frame buffers as possible */
 672         for( i = i_next_frame; (i % FRAMES_NUM) != i_which_frame; i++ )
 673         {
 674
 675             /* Check if frame buf is already filled */
 676             if( p_notif->i_frame_status[i % FRAMES_NUM] == FRAME_QUEUED )
 677                 continue;
 678
 679             p_buffer = aout_OutputNextBuffer( p_aout,
 680                 mtime + 1000000 / p_aout->output.output.i_rate *
 681                 ((i - i_next_frame + 1) * FRAME_SIZE + l_latency), VLC_FALSE );
 682
 683             /* If there is no audio data available and we have some buffered
 684              * already, then just wait for the next time */
 685             if( !p_buffer && (i != i_next_frame) )
 686             {
 687                 //msg_Err( p_aout, "only %i frame buffers filled!",
 688                 //         i - i_next_frame );
 689                 break;
 690             }
 691
 692             if( DirectxFillBuffer( p_aout, (i%FRAMES_NUM), p_buffer )
 693                 != VLC_SUCCESS )
 694                 break;
 695
 696             /* Mark the frame buffer as QUEUED */
 697             p_notif->i_frame_status[i%FRAMES_NUM] = FRAME_QUEUED;
 698         }
 699
 700     }
 701
 702     /* free the events */
 703     for( i = 0; i < FRAMES_NUM; i++ )
 704         CloseHandle( notification_events[i] );
 705
 706     msg_Dbg( p_notif, "DirectSoundThread exiting" );
 707 }