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