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