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