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