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