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

   1 /*****************************************************************************
   2  * directx.c: Windows DirectX audio output method
   3  *****************************************************************************
   4  * Copyright (C) 2001-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   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 Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_aout.h>
  35 #include <vlc_charset.h>
  36
  37 #include "windows_audio_common.h"
  38
  39 #include <dsound.h>
  40
  41 #define FRAME_SIZE ((int)p_aout->output.output.i_rate/20) /* Size in samples */
  42
  43 /*****************************************************************************
  44  * notification_thread_t: DirectX event thread
  45  *****************************************************************************/
  46 typedef struct notification_thread_t
  47 {
  48     VLC_COMMON_MEMBERS
  49
  50     aout_instance_t *p_aout;
  51     int i_frame_size;                          /* size in bytes of one frame */
  52     int i_write_slot;       /* current write position in our circular buffer */
  53
  54     mtime_t start_date;
  55     HANDLE event;
  56
  57 } notification_thread_t;
  58
  59 /*****************************************************************************
  60  * aout_sys_t: directx audio output method descriptor
  61  *****************************************************************************
  62  * This structure is part of the audio output thread descriptor.
  63  * It describes the direct sound specific properties of an audio device.
  64  *****************************************************************************/
  65 struct aout_sys_t
  66 {
  67     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
  68
  69     char *              psz_device;              /* user defined device name */
  70     LPGUID              p_device_guid;
  71
  72     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
  73     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
  74                                        * takes care of mixing all the
  75                                        * secondary buffers into the primary) */
  76
  77     notification_thread_t *p_notif;                  /* DirectSoundThread id */
  78
  79     int      b_playing;                                    /* playing status */
  80
  81     int      i_frame_size;                     /* Size in bytes of one frame */
  82
  83     int      i_speaker_setup;                      /* Speaker setup override */
  84
  85     bool     b_chan_reorder;                /* do we need channel reordering */
  86     int      pi_chan_table[AOUT_CHAN_MAX];
  87     uint32_t i_channel_mask;
  88     uint32_t i_bits_per_sample;
  89     uint32_t i_channels;
  90 };
  91
  92 /*****************************************************************************
  93  * Local prototypes.
  94  *****************************************************************************/
  95 static int  OpenAudio  ( vlc_object_t * );
  96 static void CloseAudio ( vlc_object_t * );
  97 static void Play       ( aout_instance_t * );
  98
  99 /* local functions */
 100 static void Probe             ( aout_instance_t * );
 101 static int  InitDirectSound   ( aout_instance_t * );
 102 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, bool );
 103 static int  CreateDSBufferPCM ( aout_instance_t *, vlc_fourcc_t*, int, int, int, bool );
 104 static void DestroyDSBuffer   ( aout_instance_t * );
 105 static void* DirectSoundThread( vlc_object_t * );
 106 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 107
 108 static int ReloadDirectXDevices( vlc_object_t *, char const *,
 109                                 vlc_value_t, vlc_value_t, void * );
 110
 111 /* Speaker setup override options list */
 112 static const char *const speaker_list[] = { "Windows default", "Mono", "Stereo",
 113                                             "Quad", "5.1", "7.1" };
 114 static const char *const ppsz_adev[] = {"default",  };
 115 static const char *const ppsz_adev_text[] = {"default", };
 116
 117 /*****************************************************************************
 118  * Module descriptor
 119  *****************************************************************************/
 120 #define DEVICE_TEXT N_("Output device")
 121 #define DEVICE_LONGTEXT N_("Select your audio output device")
 122
 123 #define SPEAKER_TEXT N_("Speaker configuration")
 124 #define SPEAKER_LONGTEXT N_("Select speaker configuration you want to use. " \
 125     "This option doesn't upmix! So NO e.g. Stereo -> 5.1 conversion." )
 126
 127 vlc_module_begin ()
 128     set_description( N_("DirectX audio output") )
 129     set_shortname( "DirectX" )
 130     set_capability( "audio output", 100 )
 131     set_category( CAT_AUDIO )
 132     set_subcategory( SUBCAT_AUDIO_AOUT )
 133     add_shortcut( "directx", "directsound" )
 134
 135     add_string( "directx-audio-device-name", "default",
 136              DEVICE_TEXT, DEVICE_LONGTEXT, false )
 137         add_deprecated_alias( "directx-audio-device" ) /* Since 1.1.0 */
 138         change_string_list( ppsz_adev, ppsz_adev_text, ReloadDirectXDevices )
 139         change_action_add( ReloadDirectXDevices, N_("Refresh list") )
 140         change_need_restart ()
 141     add_bool( "directx-audio-float32", false, FLOAT_TEXT,
 142               FLOAT_LONGTEXT, true )
 143     add_string( "directx-audio-speaker", "Windows default",
 144                  SPEAKER_TEXT, SPEAKER_LONGTEXT, true )
 145         change_string_list( speaker_list, 0, 0 )
 146         change_need_restart ()
 147
 148     set_callbacks( OpenAudio, CloseAudio )
 149 vlc_module_end ()
 150
 151 /*****************************************************************************
 152  * OpenAudio: open the audio device
 153  *****************************************************************************
 154  * This function opens and setups Direct Sound.
 155  *****************************************************************************/
 156 static int OpenAudio( vlc_object_t *p_this )
 157 {
 158     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 159     vlc_value_t val;
 160     char * psz_speaker;
 161     int i = 0;
 162
 163     const char * const * ppsz_compare = speaker_list;
 164
 165     msg_Dbg( p_aout, "Opening DirectSound Audio Output" );
 166
 167    /* Allocate structure */
 168     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 169     if( p_aout->output.p_sys == NULL )
 170         return VLC_ENOMEM;
 171
 172     /* Initialize some variables */
 173     p_aout->output.p_sys->p_dsobject = NULL;
 174     p_aout->output.p_sys->p_dsbuffer = NULL;
 175     p_aout->output.p_sys->p_notif = NULL;
 176     p_aout->output.p_sys->b_playing = 0;
 177
 178     p_aout->output.pf_play = Play;
 179     aout_VolumeSoftInit( p_aout );
 180
 181     /* Retrieve config values */
 182     var_Create( p_aout, "directx-audio-float32",
 183                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 184     psz_speaker = var_CreateGetString( p_aout, "directx-audio-speaker" );
 185
 186     while ( *ppsz_compare != NULL )
 187     {
 188         if ( !strncmp( *ppsz_compare, psz_speaker, strlen(*ppsz_compare) ) )
 189         {
 190             break;
 191         }
 192         ppsz_compare++; i++;
 193     }
 194
 195     if ( *ppsz_compare == NULL )
 196     {
 197         msg_Err( p_aout, "(%s) isn't valid speaker setup option", psz_speaker );
 198         msg_Err( p_aout, "Defaulting to Windows default speaker config");
 199         i = 0;
 200     }
 201     free( psz_speaker );
 202     p_aout->output.p_sys->i_speaker_setup = i;
 203
 204     p_aout->output.p_sys->p_device_guid = 0;
 205
 206     /* Initialise DirectSound */
 207     if( InitDirectSound( p_aout ) )
 208     {
 209         msg_Err( p_aout, "cannot initialize DirectSound" );
 210         goto error;
 211     }
 212
 213     if( var_Type( p_aout, "audio-device" ) == 0 )
 214     {
 215         Probe( p_aout );
 216     }
 217
 218     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 219     {
 220         /* Probe() has failed. */
 221         goto error;
 222     }
 223
 224     /* Open the device */
 225     if( val.i_int == AOUT_VAR_SPDIF )
 226     {
 227         p_aout->output.output.i_format = VLC_CODEC_SPDIFL;
 228
 229         /* Calculate the frame size in bytes */
 230         p_aout->output.i_nb_samples = A52_FRAME_NB;
 231         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 232         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 233         p_aout->output.p_sys->i_frame_size =
 234             p_aout->output.output.i_bytes_per_frame;
 235
 236         if( CreateDSBuffer( p_aout, VLC_CODEC_SPDIFL,
 237                             p_aout->output.output.i_physical_channels,
 238                             aout_FormatNbChannels( &p_aout->output.output ),
 239                             p_aout->output.output.i_rate,
 240                             p_aout->output.p_sys->i_frame_size, false )
 241             != VLC_SUCCESS )
 242         {
 243             msg_Err( p_aout, "cannot open directx audio device" );
 244             free( p_aout->output.p_sys );
 245             return VLC_EGENERIC;
 246         }
 247
 248         aout_VolumeNoneInit( p_aout );
 249     }
 250     else
 251     {
 252         if( val.i_int == AOUT_VAR_5_1 )
 253         {
 254             p_aout->output.output.i_physical_channels
 255                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 256                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 257                    | AOUT_CHAN_LFE;
 258         }
 259         else if( val.i_int == AOUT_VAR_7_1 )
 260         {
 261                     p_aout->output.output.i_physical_channels
 262                         = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 263                            | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 264                            | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
 265                            | AOUT_CHAN_LFE;
 266         }
 267         else if( val.i_int == AOUT_VAR_3F2R )
 268         {
 269             p_aout->output.output.i_physical_channels
 270                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 271                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 272         }
 273         else if( val.i_int == AOUT_VAR_2F2R )
 274         {
 275             p_aout->output.output.i_physical_channels
 276                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 277                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 278         }
 279         else if( val.i_int == AOUT_VAR_MONO )
 280         {
 281             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 282         }
 283         else
 284         {
 285             p_aout->output.output.i_physical_channels
 286                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 287         }
 288
 289         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 290                                p_aout->output.output.i_physical_channels,
 291                                aout_FormatNbChannels( &p_aout->output.output ),
 292                                p_aout->output.output.i_rate, false )
 293             != VLC_SUCCESS )
 294         {
 295             msg_Err( p_aout, "cannot open directx audio device" );
 296             free( p_aout->output.p_sys );
 297             return VLC_EGENERIC;
 298         }
 299
 300         /* Calculate the frame size in bytes */
 301         p_aout->output.i_nb_samples = FRAME_SIZE;
 302         aout_FormatPrepare( &p_aout->output.output );
 303         aout_VolumeSoftInit( p_aout );
 304     }
 305
 306     /* Now we need to setup our DirectSound play notification structure */
 307     p_aout->output.p_sys->p_notif =
 308         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 309     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 310
 311     p_aout->output.p_sys->p_notif->event = CreateEvent( 0, FALSE, FALSE, 0 );
 312     p_aout->output.p_sys->p_notif->i_frame_size =
 313         p_aout->output.p_sys->i_frame_size;
 314
 315     /* then launch the notification thread */
 316     msg_Dbg( p_aout, "creating DirectSoundThread" );
 317     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 318                            DirectSoundThread,
 319                            VLC_THREAD_PRIORITY_HIGHEST ) )
 320     {
 321         msg_Err( p_aout, "cannot create DirectSoundThread" );
 322         CloseHandle( p_aout->output.p_sys->p_notif->event );
 323         vlc_object_release( p_aout->output.p_sys->p_notif );
 324         p_aout->output.p_sys->p_notif = NULL;
 325         goto error;
 326     }
 327
 328     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 329
 330     return VLC_SUCCESS;
 331
 332  error:
 333     CloseAudio( VLC_OBJECT(p_aout) );
 334     return VLC_EGENERIC;
 335 }
 336
 337 /*****************************************************************************
 338  * Probe: probe the audio device for available formats and channels
 339  *****************************************************************************/
 340 static void Probe( aout_instance_t * p_aout )
 341 {
 342     vlc_value_t val, text;
 343     vlc_fourcc_t i_format;
 344     unsigned int i_physical_channels;
 345     DWORD ui_speaker_config;
 346     bool is_default_output_set = false;
 347
 348     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 349     text.psz_string = _("Audio Device");
 350     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 351
 352     /* Test for 5.1 support */
 353     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 354                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 355                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 356     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 357     {
 358         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 359                                p_aout->output.output.i_rate, true )
 360             == VLC_SUCCESS )
 361         {
 362             val.i_int = AOUT_VAR_5_1;
 363             text.psz_string = (char*) "5.1";
 364             var_Change( p_aout, "audio-device",
 365                         VLC_VAR_ADDCHOICE, &val, &text );
 366             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 367             is_default_output_set = true;
 368             msg_Dbg( p_aout, "device supports 5.1 channels" );
 369         }
 370     }
 371
 372     /* Test for 7.1 support */
 373     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 374                              AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 375                              AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
 376                              AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 377     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 378     {
 379         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 8,
 380                                   p_aout->output.output.i_rate, true )
 381             == VLC_SUCCESS )
 382         {
 383             val.i_int = AOUT_VAR_7_1;
 384             text.psz_string = (char*) "7.1";
 385             var_Change( p_aout, "audio-device",
 386                         VLC_VAR_ADDCHOICE, &val, &text );
 387             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 388             is_default_output_set = true;
 389             msg_Dbg( p_aout, "device supports 7.1 channels" );
 390         }
 391     }
 392
 393     /* Test for 3 Front 2 Rear support */
 394     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 395                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 396                           AOUT_CHAN_REARRIGHT;
 397     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 398     {
 399         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 5,
 400                                p_aout->output.output.i_rate, true )
 401             == VLC_SUCCESS )
 402         {
 403             val.i_int = AOUT_VAR_3F2R;
 404             text.psz_string = _("3 Front 2 Rear");
 405             var_Change( p_aout, "audio-device",
 406                         VLC_VAR_ADDCHOICE, &val, &text );
 407             if(!is_default_output_set)
 408             {
 409                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 410                 is_default_output_set = true;
 411             }
 412             msg_Dbg( p_aout, "device supports 5 channels" );
 413         }
 414     }
 415
 416     /* Test for 2 Front 2 Rear support */
 417     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 418                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 419     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 420         == i_physical_channels )
 421     {
 422         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 423                                p_aout->output.output.i_rate, true )
 424             == VLC_SUCCESS )
 425         {
 426             val.i_int = AOUT_VAR_2F2R;
 427             text.psz_string = _("2 Front 2 Rear");
 428             var_Change( p_aout, "audio-device",
 429                         VLC_VAR_ADDCHOICE, &val, &text );
 430             if(!is_default_output_set)
 431             {
 432                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 433                 is_default_output_set = true;
 434             }
 435             msg_Dbg( p_aout, "device supports 4 channels" );
 436         }
 437     }
 438
 439     /* Test for stereo support */
 440     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 441     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 442                            p_aout->output.output.i_rate, true )
 443         == VLC_SUCCESS )
 444     {
 445         val.i_int = AOUT_VAR_STEREO;
 446         text.psz_string = _("Stereo");
 447         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 448         if(!is_default_output_set)
 449         {
 450             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 451             is_default_output_set = true;
 452             msg_Dbg( p_aout, "device supports 2 channels (DEFAULT!)" );
 453         }
 454         else msg_Dbg( p_aout, "device supports 2 channels" );
 455     }
 456
 457     /* Test for mono support */
 458     i_physical_channels = AOUT_CHAN_CENTER;
 459     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 460                            p_aout->output.output.i_rate, true )
 461         == VLC_SUCCESS )
 462     {
 463         val.i_int = AOUT_VAR_MONO;
 464         text.psz_string = _("Mono");
 465         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 466         msg_Dbg( p_aout, "device supports 1 channel" );
 467     }
 468
 469     /* Check the speaker configuration to determine which channel config should
 470      * be the default */
 471     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 472                                               &ui_speaker_config ) )
 473     {
 474         ui_speaker_config = DSSPEAKER_STEREO;
 475         msg_Dbg( p_aout, "GetSpeakerConfig failed" );
 476     }
 477     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 478     {
 479     case DSSPEAKER_7POINT1:
 480         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 7.1" );
 481         val.i_int = AOUT_VAR_7_1;
 482         break;
 483     case DSSPEAKER_5POINT1:
 484         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 5.1" );
 485         val.i_int = AOUT_VAR_5_1;
 486         break;
 487     case DSSPEAKER_QUAD:
 488         msg_Dbg( p_aout, "Windows says your SpeakerConfig is Quad" );
 489         val.i_int = AOUT_VAR_2F2R;
 490         break;
 491 #if 0 /* Lots of people just get their settings wrong and complain that
 492        * this is a problem with VLC so just don't ever set mono by default. */
 493     case DSSPEAKER_MONO:
 494         val.i_int = AOUT_VAR_MONO;
 495         break;
 496 #endif
 497     case DSSPEAKER_SURROUND:
 498         msg_Dbg( p_aout, "Windows says your SpeakerConfig is surround" );
 499     case DSSPEAKER_STEREO:
 500         msg_Dbg( p_aout, "Windows says your SpeakerConfig is stereo" );
 501     default:
 502         /* If nothing else is found, choose stereo output */
 503         val.i_int = AOUT_VAR_STEREO;
 504         break;
 505     }
 506
 507     /* Check if we want to override speaker config */
 508     switch( p_aout->output.p_sys->i_speaker_setup )
 509     {
 510     case 0: /* Default value aka Windows default speaker setup */
 511         break;
 512     case 1: /* Mono */
 513         msg_Dbg( p_aout, "SpeakerConfig is forced to Mono" );
 514         val.i_int = AOUT_VAR_MONO;
 515         break;
 516     case 2: /* Stereo */
 517         msg_Dbg( p_aout, "SpeakerConfig is forced to Stereo" );
 518         val.i_int = AOUT_VAR_STEREO;
 519         break;
 520     case 3: /* Quad */
 521         msg_Dbg( p_aout, "SpeakerConfig is forced to Quad" );
 522         val.i_int = AOUT_VAR_2F2R;
 523         break;
 524     case 4: /* 5.1 */
 525         msg_Dbg( p_aout, "SpeakerConfig is forced to 5.1" );
 526         val.i_int = AOUT_VAR_5_1;
 527         break;
 528     case 5: /* 7.1 */
 529         msg_Dbg( p_aout, "SpeakerConfig is forced to 7.1" );
 530         val.i_int = AOUT_VAR_7_1;
 531         break;
 532     default:
 533         msg_Dbg( p_aout, "SpeakerConfig is forced to non-existing value" );
 534         break;
 535     }
 536
 537     var_Set( p_aout, "audio-device", val );
 538
 539     /* Test for SPDIF support */
 540     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 541     {
 542         if( CreateDSBuffer( p_aout, VLC_CODEC_SPDIFL,
 543                             p_aout->output.output.i_physical_channels,
 544                             aout_FormatNbChannels( &p_aout->output.output ),
 545                             p_aout->output.output.i_rate,
 546                             AOUT_SPDIF_SIZE, true )
 547             == VLC_SUCCESS )
 548         {
 549             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 550             val.i_int = AOUT_VAR_SPDIF;
 551             text.psz_string = _("A/52 over S/PDIF");
 552             var_Change( p_aout, "audio-device",
 553                         VLC_VAR_ADDCHOICE, &val, &text );
 554             if( var_InheritBool( p_aout, "spdif" ) )
 555                 var_Set( p_aout, "audio-device", val );
 556         }
 557     }
 558
 559     var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
 560     if( val.i_int <= 0 )
 561     {
 562         /* Probe() has failed. */
 563         var_Destroy( p_aout, "audio-device" );
 564         return;
 565     }
 566
 567     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 568     var_TriggerCallback( p_aout, "intf-change" );
 569 }
 570
 571 /*****************************************************************************
 572  * Play: we'll start playing the directsound buffer here because at least here
 573  *       we know the first buffer has been put in the aout fifo and we also
 574  *       know its date.
 575  *****************************************************************************/
 576 static void Play( aout_instance_t *p_aout )
 577 {
 578     if( !p_aout->output.p_sys->b_playing )
 579     {
 580         aout_buffer_t *p_buffer;
 581
 582         p_aout->output.p_sys->b_playing = 1;
 583
 584         /* get the playing date of the first aout buffer */
 585         p_aout->output.p_sys->p_notif->start_date =
 586             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 587
 588         /* fill in the first samples */
 589         for( int i = 0; i < FRAMES_NUM; i++ )
 590         {
 591             p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 592             if( !p_buffer ) break;
 593             FillBuffer( p_aout, i, p_buffer );
 594         }
 595
 596         /* wake up the audio output thread */
 597         SetEvent( p_aout->output.p_sys->p_notif->event );
 598     }
 599 }
 600
 601 /*****************************************************************************
 602  * CloseAudio: close the audio device
 603  *****************************************************************************/
 604 static void CloseAudio( vlc_object_t *p_this )
 605 {
 606     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 607     aout_sys_t *p_sys = p_aout->output.p_sys;
 608
 609     msg_Dbg( p_aout, "closing audio device" );
 610
 611     /* kill the position notification thread, if any */
 612     if( p_sys->p_notif )
 613     {
 614         vlc_object_kill( p_sys->p_notif );
 615         /* wake up the audio thread if needed */
 616         if( !p_sys->b_playing ) SetEvent( p_sys->p_notif->event );
 617
 618         vlc_thread_join( p_sys->p_notif );
 619         vlc_object_release( p_sys->p_notif );
 620     }
 621
 622     /* release the secondary buffer */
 623     DestroyDSBuffer( p_aout );
 624
 625     /* finally release the DirectSound object */
 626     if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
 627
 628     /* free DSOUND.DLL */
 629     if( p_sys->hdsound_dll ) FreeLibrary( p_sys->hdsound_dll );
 630
 631     free( p_aout->output.p_sys->p_device_guid );
 632     free( p_sys );
 633 }
 634
 635 /*****************************************************************************
 636  * CallBackDirectSoundEnum: callback to enumerate available devices
 637  *****************************************************************************/
 638 static int CALLBACK CallBackDirectSoundEnum( LPGUID p_guid, LPCWSTR psz_desc,
 639                                              LPCWSTR psz_mod, LPVOID _p_aout )
 640 {
 641     VLC_UNUSED( psz_mod );
 642
 643     aout_instance_t *p_aout = (aout_instance_t *)_p_aout;
 644
 645     char *psz_device = FromWide( psz_desc );
 646     msg_Dbg( p_aout, "found device: %s", psz_device );
 647
 648     if( p_aout->output.p_sys->psz_device &&
 649         !strcmp(p_aout->output.p_sys->psz_device, psz_device) && p_guid )
 650     {
 651         /* Use the device corresponding to psz_device */
 652         p_aout->output.p_sys->p_device_guid = malloc( sizeof( GUID ) );
 653         *p_aout->output.p_sys->p_device_guid = *p_guid;
 654         msg_Dbg( p_aout, "using device: %s", psz_device );
 655     }
 656     else
 657     {
 658         /* If no default device has been selected, chose the first one */
 659         if( !p_aout->output.p_sys->psz_device && p_guid )
 660         {
 661             p_aout->output.p_sys->psz_device = strdup( psz_device );
 662             p_aout->output.p_sys->p_device_guid = malloc( sizeof( GUID ) );
 663             *p_aout->output.p_sys->p_device_guid = *p_guid;
 664             msg_Dbg( p_aout, "using device: %s", psz_device );
 665         }
 666     }
 667
 668     free( psz_device );
 669     return true;
 670 }
 671
 672 /*****************************************************************************
 673  * InitDirectSound: handle all the gory details of DirectSound initialisation
 674  *****************************************************************************/
 675 static int InitDirectSound( aout_instance_t *p_aout )
 676 {
 677     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 678     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACKW, LPVOID);
 679
 680     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 681     if( p_aout->output.p_sys->hdsound_dll == NULL )
 682     {
 683         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 684         goto error;
 685     }
 686
 687     OurDirectSoundCreate = (void *)
 688         GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 689                         "DirectSoundCreate" );
 690     if( OurDirectSoundCreate == NULL )
 691     {
 692         msg_Warn( p_aout, "GetProcAddress FAILED" );
 693         goto error;
 694     }
 695
 696     /* Get DirectSoundEnumerate */
 697     OurDirectSoundEnumerate = (void *)
 698        GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 699                        "DirectSoundEnumerateW" );
 700     if( OurDirectSoundEnumerate )
 701     {
 702         p_aout->output.p_sys->psz_device = var_InheritString(p_aout, "directx-audio-device-name");
 703         /* Attempt enumeration */
 704         if( FAILED( OurDirectSoundEnumerate( CallBackDirectSoundEnum,
 705                                              p_aout ) ) )
 706         {
 707             msg_Dbg( p_aout, "enumeration of DirectSound devices failed" );
 708         }
 709     }
 710
 711     /* Create the direct sound object */
 712     if FAILED( OurDirectSoundCreate( p_aout->output.p_sys->p_device_guid,
 713                                      &p_aout->output.p_sys->p_dsobject,
 714                                      NULL ) )
 715     {
 716         msg_Warn( p_aout, "cannot create a direct sound device" );
 717         goto error;
 718     }
 719
 720     /* Set DirectSound Cooperative level, ie what control we want over Windows
 721      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 722      * settings of the primary buffer, but also that only the sound of our
 723      * application will be hearable when it will have the focus.
 724      * !!! (this is not really working as intended yet because to set the
 725      * cooperative level you need the window handle of your application, and
 726      * I don't know of any easy way to get it. Especially since we might play
 727      * sound without any video, and so what window handle should we use ???
 728      * The hack for now is to use the Desktop window handle - it seems to be
 729      * working */
 730     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 731                                           GetDesktopWindow(),
 732                                           DSSCL_EXCLUSIVE) )
 733     {
 734         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 735     }
 736
 737     return VLC_SUCCESS;
 738
 739  error:
 740     p_aout->output.p_sys->p_dsobject = NULL;
 741     if( p_aout->output.p_sys->hdsound_dll )
 742     {
 743         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 744         p_aout->output.p_sys->hdsound_dll = NULL;
 745     }
 746     return VLC_EGENERIC;
 747
 748 }
 749
 750 /*****************************************************************************
 751  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 752  *****************************************************************************
 753  * This function creates the buffer we'll use to play audio.
 754  * In DirectSound there are two kinds of buffers:
 755  * - the primary buffer: which is the actual buffer that the soundcard plays
 756  * - the secondary buffer(s): these buffers are the one actually used by
 757  *    applications and DirectSound takes care of mixing them into the primary.
 758  *
 759  * Once you create a secondary buffer, you cannot change its format anymore so
 760  * you have to release the current one and create another.
 761  *****************************************************************************/
 762 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 763                            int i_channels, int i_nb_channels, int i_rate,
 764                            int i_bytes_per_frame, bool b_probe )
 765 {
 766     WAVEFORMATEXTENSIBLE waveformat;
 767     DSBUFFERDESC         dsbdesc;
 768     unsigned int         i;
 769
 770     /* First set the sound buffer format */
 771     waveformat.dwChannelMask = 0;
 772     for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
 773     {
 774         if( i_channels & pi_channels_src[i] )
 775             waveformat.dwChannelMask |= pi_channels_in[i];
 776     }
 777
 778     switch( i_format )
 779     {
 780     case VLC_CODEC_SPDIFL:
 781         i_nb_channels = 2;
 782         /* To prevent channel re-ordering */
 783         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 784         waveformat.Format.wBitsPerSample = 16;
 785         waveformat.Samples.wValidBitsPerSample =
 786             waveformat.Format.wBitsPerSample;
 787         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 788         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 789         break;
 790
 791     case VLC_CODEC_FL32:
 792         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 793         waveformat.Samples.wValidBitsPerSample =
 794             waveformat.Format.wBitsPerSample;
 795         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 796         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 797         break;
 798
 799     case VLC_CODEC_S16L:
 800         waveformat.Format.wBitsPerSample = 16;
 801         waveformat.Samples.wValidBitsPerSample =
 802             waveformat.Format.wBitsPerSample;
 803         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 804         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 805         break;
 806     }
 807
 808     waveformat.Format.nChannels = i_nb_channels;
 809     waveformat.Format.nSamplesPerSec = i_rate;
 810     waveformat.Format.nBlockAlign =
 811         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 812     waveformat.Format.nAvgBytesPerSec =
 813         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 814
 815     p_aout->output.p_sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
 816     p_aout->output.p_sys->i_channels = i_nb_channels;
 817
 818     /* Then fill in the direct sound descriptor */
 819     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 820     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 821     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 822                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 823
 824     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 825     if( i_nb_channels <= 2 )
 826     {
 827         waveformat.Format.cbSize = 0;
 828     }
 829     else
 830     {
 831         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 832         waveformat.Format.cbSize =
 833             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 834
 835         /* Needed for 5.1 on emu101k */
 836         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 837     }
 838
 839     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 840     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 841
 842     if FAILED( IDirectSound_CreateSoundBuffer(
 843                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 844                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 845     {
 846         if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
 847         {
 848             /* Try without DSBCAPS_LOCHARDWARE */
 849             dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 850             if FAILED( IDirectSound_CreateSoundBuffer(
 851                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 852                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 853             {
 854                 return VLC_EGENERIC;
 855             }
 856             if( !b_probe )
 857                 msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
 858         }
 859         else
 860         {
 861             return VLC_EGENERIC;
 862         }
 863     }
 864
 865     /* Stop here if we were just probing */
 866     if( b_probe )
 867     {
 868         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 869         p_aout->output.p_sys->p_dsbuffer = NULL;
 870         return VLC_SUCCESS;
 871     }
 872
 873     p_aout->output.p_sys->i_frame_size = i_bytes_per_frame;
 874     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 875     p_aout->output.p_sys->b_chan_reorder =
 876         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
 877                                   waveformat.dwChannelMask, i_nb_channels,
 878                                   p_aout->output.p_sys->pi_chan_table );
 879
 880     if( p_aout->output.p_sys->b_chan_reorder )
 881     {
 882         msg_Dbg( p_aout, "channel reordering needed" );
 883     }
 884
 885     return VLC_SUCCESS;
 886 }
 887
 888 /*****************************************************************************
 889  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 890  *****************************************************************************
 891  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 892  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 893  ****************************************************************************/
 894 static int CreateDSBufferPCM( aout_instance_t *p_aout, vlc_fourcc_t *i_format,
 895                               int i_channels, int i_nb_channels, int i_rate,
 896                               bool b_probe )
 897 {
 898     /* Float32 audio samples are not supported for 5.1 output on the emu101k */
 899     if( !var_GetBool( p_aout, "directx-audio-float32" ) ||
 900         i_nb_channels > 2 ||
 901         CreateDSBuffer( p_aout, VLC_CODEC_FL32,
 902                         i_channels, i_nb_channels, i_rate,
 903                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 904         != VLC_SUCCESS )
 905     {
 906         if ( CreateDSBuffer( p_aout, VLC_CODEC_S16L,
 907                              i_channels, i_nb_channels, i_rate,
 908                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 909              != VLC_SUCCESS )
 910         {
 911             return VLC_EGENERIC;
 912         }
 913         else
 914         {
 915             *i_format = VLC_CODEC_S16L;
 916             return VLC_SUCCESS;
 917         }
 918     }
 919     else
 920     {
 921         *i_format = VLC_CODEC_FL32;
 922         return VLC_SUCCESS;
 923     }
 924 }
 925
 926 /*****************************************************************************
 927  * DestroyDSBuffer
 928  *****************************************************************************
 929  * This function destroys the secondary buffer.
 930  *****************************************************************************/
 931 static void DestroyDSBuffer( aout_instance_t *p_aout )
 932 {
 933     if( p_aout->output.p_sys->p_dsbuffer )
 934     {
 935         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 936         p_aout->output.p_sys->p_dsbuffer = NULL;
 937     }
 938 }
 939
 940 /*****************************************************************************
 941  * FillBuffer: Fill in one of the direct sound frame buffers.
 942  *****************************************************************************
 943  * Returns VLC_SUCCESS on success.
 944  *****************************************************************************/
 945 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 946                        aout_buffer_t *p_buffer )
 947 {
 948     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 949     aout_sys_t *p_sys = p_aout->output.p_sys;
 950     void *p_write_position, *p_wrap_around;
 951     unsigned long l_bytes1, l_bytes2;
 952     HRESULT dsresult;
 953
 954     /* Before copying anything, we have to lock the buffer */
 955     dsresult = IDirectSoundBuffer_Lock(
 956                 p_sys->p_dsbuffer,                              /* DS buffer */
 957                 i_frame * p_notif->i_frame_size,             /* Start offset */
 958                 p_notif->i_frame_size,                    /* Number of bytes */
 959                 &p_write_position,                  /* Address of lock start */
 960                 &l_bytes1,       /* Count of bytes locked before wrap around */
 961                 &p_wrap_around,           /* Buffer address (if wrap around) */
 962                 &l_bytes2,               /* Count of bytes after wrap around */
 963                 0 );                                                /* Flags */
 964     if( dsresult == DSERR_BUFFERLOST )
 965     {
 966         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
 967         dsresult = IDirectSoundBuffer_Lock(
 968                                p_sys->p_dsbuffer,
 969                                i_frame * p_notif->i_frame_size,
 970                                p_notif->i_frame_size,
 971                                &p_write_position,
 972                                &l_bytes1,
 973                                &p_wrap_around,
 974                                &l_bytes2,
 975                                0 );
 976     }
 977     if( dsresult != DS_OK )
 978     {
 979         msg_Warn( p_notif, "cannot lock buffer" );
 980         if( p_buffer ) aout_BufferFree( p_buffer );
 981         return VLC_EGENERIC;
 982     }
 983
 984     if( p_buffer == NULL )
 985     {
 986         memset( p_write_position, 0, l_bytes1 );
 987     }
 988     else
 989     {
 990         if( p_sys->b_chan_reorder )
 991         {
 992             /* Do the channel reordering here */
 993             aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_buffer,
 994                                  p_sys->i_channels, p_sys->pi_chan_table,
 995                                  p_sys->i_bits_per_sample );
 996         }
 997
 998         vlc_memcpy( p_write_position, p_buffer->p_buffer, l_bytes1 );
 999         aout_BufferFree( p_buffer );
1000     }
1001
1002     /* Now the data has been copied, unlock the buffer */
1003     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
1004                                p_wrap_around, l_bytes2 );
1005
1006     p_notif->i_write_slot = (i_frame + 1) % FRAMES_NUM;
1007     return VLC_SUCCESS;
1008 }
1009
1010 /*****************************************************************************
1011  * DirectSoundThread: this thread will capture play notification events.
1012  *****************************************************************************
1013  * We use this thread to emulate a callback mechanism. The thread probes for
1014  * event notification and fills up the DS secondary buffer when needed.
1015  *****************************************************************************/
1016 static void* DirectSoundThread( vlc_object_t *p_this )
1017 {
1018     notification_thread_t *p_notif = (notification_thread_t*)p_this;
1019     aout_instance_t *p_aout = p_notif->p_aout;
1020     mtime_t last_time;
1021     int canc = vlc_savecancel ();
1022
1023     /* We don't want any resampling when using S/PDIF output */
1024     bool b_sleek = (p_aout->output.output.i_format == VLC_CODEC_SPDIFL);
1025
1026     msg_Dbg( p_notif, "DirectSoundThread ready" );
1027
1028     /* Wait here until Play() is called */
1029     WaitForSingleObject( p_notif->event, INFINITE );
1030
1031     if( vlc_object_alive (p_notif) )
1032     {
1033         HRESULT dsresult;
1034         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
1035
1036         /* start playing the buffer */
1037         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
1038                                         0,                         /* Unused */
1039                                         0,                         /* Unused */
1040                                         DSBPLAY_LOOPING );          /* Flags */
1041         if( dsresult == DSERR_BUFFERLOST )
1042         {
1043             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
1044             dsresult = IDirectSoundBuffer_Play(
1045                                             p_aout->output.p_sys->p_dsbuffer,
1046                                             0,                     /* Unused */
1047                                             0,                     /* Unused */
1048                                             DSBPLAY_LOOPING );      /* Flags */
1049         }
1050         if( dsresult != DS_OK )
1051         {
1052             msg_Err( p_aout, "cannot start playing buffer" );
1053         }
1054     }
1055     last_time = mdate();
1056
1057     while( vlc_object_alive (p_notif) )
1058     {
1059         DWORD l_read;
1060         int l_queued = 0, l_free_slots;
1061         unsigned i_frame_siz = p_aout->output.i_nb_samples;
1062         mtime_t mtime = mdate();
1063         int i;
1064
1065         /*
1066          * Fill in as much audio data as we can in our circular buffer
1067          */
1068
1069         /* Find out current play position */
1070         if FAILED( IDirectSoundBuffer_GetCurrentPosition(
1071                    p_aout->output.p_sys->p_dsbuffer, &l_read, NULL ) )
1072         {
1073             msg_Err( p_aout, "GetCurrentPosition() failed!" );
1074             l_read = 0;
1075         }
1076
1077         /* Detect underruns */
1078         if( l_queued && mtime - last_time >
1079             INT64_C(1000000) * l_queued / p_aout->output.output.i_rate )
1080         {
1081             msg_Dbg( p_aout, "detected underrun!" );
1082         }
1083         last_time = mtime;
1084
1085         /* Try to fill in as many frame buffers as possible */
1086         l_read /= (p_aout->output.output.i_bytes_per_frame /
1087             p_aout->output.output.i_frame_length);
1088         l_queued = p_notif->i_write_slot * i_frame_siz - l_read;
1089         if( l_queued < 0 ) l_queued += (i_frame_siz * FRAMES_NUM);
1090         l_free_slots = (FRAMES_NUM * i_frame_siz - l_queued) / i_frame_siz;
1091
1092         for( i = 0; i < l_free_slots; i++ )
1093         {
1094             aout_buffer_t *p_buffer = aout_OutputNextBuffer( p_aout,
1095                 mtime + INT64_C(1000000) * (i * i_frame_siz + l_queued) /
1096                 p_aout->output.output.i_rate, b_sleek );
1097
1098             /* If there is no audio data available and we have some buffered
1099              * already, then just wait for the next time */
1100             if( !p_buffer && (i || l_queued / i_frame_siz) ) break;
1101
1102             if( FillBuffer( p_aout, p_notif->i_write_slot % FRAMES_NUM,
1103                             p_buffer ) != VLC_SUCCESS ) break;
1104         }
1105
1106         /* Sleep a reasonable amount of time */
1107         l_queued += (i * i_frame_siz);
1108         msleep( INT64_C(1000000) * l_queued / p_aout->output.output.i_rate / 2 );
1109     }
1110
1111     /* make sure the buffer isn't playing */
1112     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1113
1114     /* free the event */
1115     CloseHandle( p_notif->event );
1116
1117     vlc_restorecancel (canc);
1118     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1119     return NULL;
1120 }
1121
1122 /*****************************************************************************
1123  * CallBackConfigNBEnum: callback to get the number of available devices
1124  *****************************************************************************/
1125 static int CALLBACK CallBackConfigNBEnum( LPGUID p_guid, LPCWSTR psz_desc,
1126                                              LPCWSTR psz_mod, LPVOID p_nb )
1127 {
1128     VLC_UNUSED( psz_mod ); VLC_UNUSED( psz_desc ); VLC_UNUSED( p_guid );
1129
1130     int * a = (int *)p_nb;
1131     (*a)++;
1132     return true;
1133 }
1134
1135 /*****************************************************************************
1136  * CallBackConfigEnum: callback to add available devices to the preferences list
1137  *****************************************************************************/
1138 static int CALLBACK CallBackConfigEnum( LPGUID p_guid, LPCWSTR psz_desc,
1139                                              LPCWSTR psz_mod, LPVOID _p_item )
1140 {
1141     VLC_UNUSED( psz_mod ); VLC_UNUSED( p_guid );
1142
1143     module_config_t *p_item = (module_config_t *) _p_item;
1144
1145     p_item->ppsz_list[p_item->i_list] = FromWide( psz_desc );
1146     p_item->ppsz_list_text[p_item->i_list] = FromWide( psz_desc );
1147     p_item->i_list++;
1148     return true;
1149 }
1150
1151 /*****************************************************************************
1152  * ReloadDirectXDevices: store the list of devices in preferences
1153  *****************************************************************************/
1154 static int ReloadDirectXDevices( vlc_object_t *p_this, char const *psz_name,
1155                                  vlc_value_t newval, vlc_value_t oldval, void *data )
1156 {
1157     VLC_UNUSED( newval ); VLC_UNUSED( oldval ); VLC_UNUSED( data );
1158
1159     module_config_t *p_item = config_FindConfig( p_this, psz_name );
1160     if( !p_item ) return VLC_SUCCESS;
1161
1162     /* Clear-up the current list */
1163     if( p_item->i_list )
1164     {
1165         for( int i = 0; i < p_item->i_list; i++ )
1166         {
1167             free((char *)(p_item->ppsz_list[i]) );
1168             free((char *)(p_item->ppsz_list_text[i]) );
1169         }
1170     }
1171
1172     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACKW, LPVOID);
1173
1174     HANDLE hdsound_dll = LoadLibrary("DSOUND.DLL");
1175     if( hdsound_dll == NULL )
1176     {
1177         msg_Warn( p_this, "cannot open DSOUND.DLL" );
1178         return VLC_SUCCESS;
1179     }
1180
1181     /* Get DirectSoundEnumerate */
1182     OurDirectSoundEnumerate = (void *)
1183                     GetProcAddress( hdsound_dll, "DirectSoundEnumerateW" );
1184
1185     if( OurDirectSoundEnumerate == NULL )
1186         goto error;
1187
1188     int nb_devices = 0;
1189     OurDirectSoundEnumerate(CallBackConfigNBEnum, &nb_devices);
1190     msg_Dbg(p_this,"found %d devices", nb_devices);
1191
1192     p_item->ppsz_list = xrealloc( p_item->ppsz_list,
1193                                   nb_devices * sizeof(char *) );
1194     p_item->ppsz_list_text = xrealloc( p_item->ppsz_list_text,
1195                                   nb_devices * sizeof(char *) );
1196
1197     p_item->i_list = 0;
1198     OurDirectSoundEnumerate(CallBackConfigEnum, p_item);
1199
1200     /* Signal change to the interface */
1201     p_item->b_dirty = true;
1202
1203 error:
1204     FreeLibrary(hdsound_dll);
1205
1206     return VLC_SUCCESS;
1207 }
1208