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 <math.h>
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_aout.h>
  37 #include <vlc_charset.h>
  38 #include <vlc_atomic.h>
  39
  40 #include "windows_audio_common.h"
  41
  42 #define FRAME_SIZE ((int)p_aout->format.i_rate/20) /* Size in samples */
  43
  44 /*****************************************************************************
  45  * notification_thread_t: DirectX event thread
  46  *****************************************************************************/
  47 typedef struct notification_thread_t
  48 {
  49     int i_frame_size;                          /* size in bytes of one frame */
  50     int i_write_slot;       /* current write position in our circular buffer */
  51
  52     mtime_t start_date;
  53     HANDLE event;
  54
  55     vlc_thread_t thread;
  56     vlc_atomic_t abort;
  57
  58 } notification_thread_t;
  59
  60 /*****************************************************************************
  61  * aout_sys_t: directx audio output method descriptor
  62  *****************************************************************************
  63  * This structure is part of the audio output thread descriptor.
  64  * It describes the direct sound specific properties of an audio device.
  65  *****************************************************************************/
  66 struct aout_sys_t
  67 {
  68     aout_packet_t       packet;
  69     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
  70
  71     char *              psz_device;              /* user defined device name */
  72     LPGUID              p_device_guid;
  73
  74     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
  75     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
  76                                        * takes care of mixing all the
  77                                        * secondary buffers into the primary) */
  78     struct
  79     {
  80         LONG             volume;
  81         LONG             mb;
  82         bool             mute;
  83     } volume;
  84
  85     notification_thread_t notif;                  /* DirectSoundThread id */
  86
  87     int      i_frame_size;                     /* Size in bytes of one frame */
  88
  89     int      i_speaker_setup;                      /* Speaker setup override */
  90
  91     bool     b_chan_reorder;                /* do we need channel reordering */
  92     int      pi_chan_table[AOUT_CHAN_MAX];
  93     uint32_t i_channel_mask;
  94     uint32_t i_bits_per_sample;
  95     uint32_t i_channels;
  96 };
  97
  98 /*****************************************************************************
  99  * Local prototypes.
 100  *****************************************************************************/
 101 static int  OpenAudio  ( vlc_object_t * );
 102 static void CloseAudio ( vlc_object_t * );
 103 static void Play       ( audio_output_t *, block_t *, mtime_t * );
 104 static int  VolumeSet  ( audio_output_t *, float );
 105 static int  MuteSet    ( audio_output_t *, bool );
 106
 107 /* local functions */
 108 static void Probe             ( audio_output_t * );
 109 static int  InitDirectSound   ( audio_output_t * );
 110 static int  CreateDSBuffer    ( audio_output_t *, int, int, int, int, int, bool );
 111 static int  CreateDSBufferPCM ( audio_output_t *, vlc_fourcc_t*, int, int, int, bool );
 112 static void DestroyDSBuffer   ( audio_output_t * );
 113 static void* DirectSoundThread( void * );
 114 static int  FillBuffer        ( audio_output_t *, int, block_t * );
 115
 116 static int ReloadDirectXDevices( vlc_object_t *, char const *,
 117                                 vlc_value_t, vlc_value_t, void * );
 118
 119 /* Speaker setup override options list */
 120 static const char *const speaker_list[] = { "Windows default", "Mono", "Stereo",
 121                                             "Quad", "5.1", "7.1" };
 122 static const char *const ppsz_adev[] = {"default",  };
 123 static const char *const ppsz_adev_text[] = {"default", };
 124
 125 /*****************************************************************************
 126  * Module descriptor
 127  *****************************************************************************/
 128 #define DEVICE_TEXT N_("Output device")
 129 #define DEVICE_LONGTEXT N_("Select your audio output device")
 130
 131 #define SPEAKER_TEXT N_("Speaker configuration")
 132 #define SPEAKER_LONGTEXT N_("Select speaker configuration you want to use. " \
 133     "This option doesn't upmix! So NO e.g. Stereo -> 5.1 conversion." )
 134
 135 vlc_module_begin ()
 136     set_description( N_("DirectX audio output") )
 137     set_shortname( "DirectX" )
 138     set_capability( "audio output", 100 )
 139     set_category( CAT_AUDIO )
 140     set_subcategory( SUBCAT_AUDIO_AOUT )
 141     add_shortcut( "directx", "aout_directx" )
 142
 143     add_string( "directx-audio-device", "default",
 144              DEVICE_TEXT, DEVICE_LONGTEXT, false )
 145         change_string_list( ppsz_adev, ppsz_adev_text, ReloadDirectXDevices )
 146         change_action_add( ReloadDirectXDevices, N_("Refresh list") )
 147     add_obsolete_string( "directx-audio-device-name")
 148     add_bool( "directx-audio-float32", false, FLOAT_TEXT,
 149               FLOAT_LONGTEXT, true )
 150     add_string( "directx-audio-speaker", "Windows default",
 151                  SPEAKER_TEXT, SPEAKER_LONGTEXT, true )
 152         change_string_list( speaker_list, 0, 0 )
 153
 154     set_callbacks( OpenAudio, CloseAudio )
 155 vlc_module_end ()
 156
 157 /*****************************************************************************
 158  * OpenAudio: open the audio device
 159  *****************************************************************************
 160  * This function opens and setups Direct Sound.
 161  *****************************************************************************/
 162 static int OpenAudio( vlc_object_t *p_this )
 163 {
 164     audio_output_t * p_aout = (audio_output_t *)p_this;
 165     vlc_value_t val;
 166     char * psz_speaker;
 167     int i = 0;
 168
 169     const char * const * ppsz_compare = speaker_list;
 170
 171     msg_Dbg( p_aout, "Opening DirectSound Audio Output" );
 172
 173    /* Allocate structure */
 174     p_aout->sys = calloc( 1, sizeof( aout_sys_t ) );
 175     if( unlikely( p_aout->sys == NULL ) )
 176         return VLC_ENOMEM;
 177
 178     /* Retrieve config values */
 179     var_Create( p_aout, "directx-audio-float32",
 180                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 181     psz_speaker = var_CreateGetString( p_aout, "directx-audio-speaker" );
 182
 183     while ( *ppsz_compare != NULL )
 184     {
 185         if ( !strncmp( *ppsz_compare, psz_speaker, strlen(*ppsz_compare) ) )
 186         {
 187             break;
 188         }
 189         ppsz_compare++; i++;
 190     }
 191
 192     if ( *ppsz_compare == NULL )
 193     {
 194         msg_Err( p_aout, "(%s) isn't valid speaker setup option", psz_speaker );
 195         msg_Err( p_aout, "Defaulting to Windows default speaker config");
 196         i = 0;
 197     }
 198     free( psz_speaker );
 199     p_aout->sys->i_speaker_setup = i;
 200
 201     /* Initialise DirectSound */
 202     if( InitDirectSound( p_aout ) )
 203     {
 204         msg_Err( p_aout, "cannot initialize DirectSound" );
 205         goto error;
 206     }
 207
 208     if( var_Type( p_aout, "audio-device" ) == 0 )
 209     {
 210         Probe( p_aout );
 211     }
 212
 213     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 214     {
 215         msg_Err( p_aout, "DirectSound Probe failed()" );
 216         goto error;
 217     }
 218
 219     /* Open the device */
 220     if( val.i_int == AOUT_VAR_SPDIF )
 221     {
 222         p_aout->format.i_format = VLC_CODEC_SPDIFL;
 223
 224         /* Calculate the frame size in bytes */
 225         p_aout->format.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 226         p_aout->format.i_frame_length = A52_FRAME_NB;
 227         p_aout->sys->i_frame_size = p_aout->format.i_bytes_per_frame;
 228
 229         if( CreateDSBuffer( p_aout, VLC_CODEC_SPDIFL,
 230                             p_aout->format.i_physical_channels,
 231                             aout_FormatNbChannels( &p_aout->format ),
 232                             p_aout->format.i_rate,
 233                             p_aout->sys->i_frame_size, false )
 234             != VLC_SUCCESS )
 235         {
 236             msg_Err( p_aout, "cannot open directx audio device" );
 237             goto error;
 238         }
 239
 240         aout_PacketInit( p_aout, &p_aout->sys->packet, A52_FRAME_NB );
 241     }
 242     else
 243     {
 244         if( val.i_int == AOUT_VAR_5_1 )
 245         {
 246             p_aout->format.i_physical_channels
 247                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 248                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 249                    | AOUT_CHAN_LFE;
 250         }
 251         else if( val.i_int == AOUT_VAR_7_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_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
 257                            | AOUT_CHAN_LFE;
 258         }
 259         else if( val.i_int == AOUT_VAR_3F2R )
 260         {
 261             p_aout->format.i_physical_channels
 262                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 263                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 264         }
 265         else if( val.i_int == AOUT_VAR_2F2R )
 266         {
 267             p_aout->format.i_physical_channels
 268                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 269                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 270         }
 271         else if( val.i_int == AOUT_VAR_MONO )
 272         {
 273             p_aout->format.i_physical_channels = AOUT_CHAN_CENTER;
 274         }
 275         else
 276         {
 277             p_aout->format.i_physical_channels
 278                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 279         }
 280
 281         if( CreateDSBufferPCM( p_aout, &p_aout->format.i_format,
 282                                p_aout->format.i_physical_channels,
 283                                aout_FormatNbChannels( &p_aout->format ),
 284                                p_aout->format.i_rate, false )
 285             != VLC_SUCCESS )
 286         {
 287             msg_Err( p_aout, "cannot open directx audio device" );
 288             goto error;
 289         }
 290
 291         /* Calculate the frame size in bytes */
 292         aout_FormatPrepare( &p_aout->format );
 293         aout_PacketInit( p_aout, &p_aout->sys->packet, FRAME_SIZE );
 294     }
 295
 296     p_aout->sys->volume.volume = -1;
 297
 298     /* Now we need to setup our DirectSound play notification structure */
 299     vlc_atomic_set(&p_aout->sys->notif.abort, 0);
 300     p_aout->sys->notif.event = CreateEvent( 0, FALSE, FALSE, 0 );
 301     if( unlikely(p_aout->sys->notif.event == NULL) )
 302         abort();
 303     p_aout->sys->notif.i_frame_size =  p_aout->sys->i_frame_size;
 304
 305     /* then launch the notification thread */
 306     msg_Dbg( p_aout, "creating DirectSoundThread" );
 307     if( vlc_clone( &p_aout->sys->notif.thread, DirectSoundThread, p_aout,
 308                    VLC_THREAD_PRIORITY_HIGHEST ) )
 309     {
 310         msg_Err( p_aout, "cannot create DirectSoundThread" );
 311         CloseHandle( p_aout->sys->notif.event );
 312         p_aout->sys->notif.event = NULL;
 313         aout_PacketDestroy( p_aout );
 314         goto error;
 315     }
 316
 317     p_aout->pf_play = Play;
 318     p_aout->pf_pause = aout_PacketPause;
 319     p_aout->pf_flush = aout_PacketFlush;
 320
 321     /* Volume */
 322     if( val.i_int == AOUT_VAR_SPDIF )
 323     {
 324         p_aout->volume_set = NULL;
 325         p_aout->mute_set = NULL;
 326     }
 327     else
 328     {
 329         p_aout->sys->volume.mb = 0;
 330         p_aout->sys->volume.mute = false;
 331         p_aout->volume_set = VolumeSet;
 332         p_aout->mute_set = MuteSet;
 333     }
 334     return VLC_SUCCESS;
 335
 336  error:
 337     CloseAudio( VLC_OBJECT(p_aout) );
 338     return VLC_EGENERIC;
 339 }
 340
 341 /*****************************************************************************
 342  * Probe: probe the audio device for available formats and channels
 343  *****************************************************************************/
 344 static void Probe( audio_output_t * p_aout )
 345 {
 346     vlc_value_t val, text;
 347     vlc_fourcc_t i_format;
 348     unsigned int i_physical_channels;
 349     DWORD ui_speaker_config;
 350     bool is_default_output_set = false;
 351
 352     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 353     text.psz_string = _("Audio Device");
 354     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 355
 356     /* Test for 5.1 support */
 357     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 358                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 359                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 360     if( p_aout->format.i_physical_channels == i_physical_channels )
 361     {
 362         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 363                                p_aout->format.i_rate, true )
 364             == VLC_SUCCESS )
 365         {
 366             val.i_int = AOUT_VAR_5_1;
 367             text.psz_string = (char*) "5.1";
 368             var_Change( p_aout, "audio-device",
 369                         VLC_VAR_ADDCHOICE, &val, &text );
 370             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 371             is_default_output_set = true;
 372             msg_Dbg( p_aout, "device supports 5.1 channels" );
 373         }
 374     }
 375
 376     /* Test for 7.1 support */
 377     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 378                              AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 379                              AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
 380                              AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 381     if( p_aout->format.i_physical_channels == i_physical_channels )
 382     {
 383         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 8,
 384                                   p_aout->format.i_rate, true )
 385             == VLC_SUCCESS )
 386         {
 387             val.i_int = AOUT_VAR_7_1;
 388             text.psz_string = (char*) "7.1";
 389             var_Change( p_aout, "audio-device",
 390                         VLC_VAR_ADDCHOICE, &val, &text );
 391             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 392             is_default_output_set = true;
 393             msg_Dbg( p_aout, "device supports 7.1 channels" );
 394         }
 395     }
 396
 397     /* Test for 3 Front 2 Rear support */
 398     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 399                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 400                           AOUT_CHAN_REARRIGHT;
 401     if( p_aout->format.i_physical_channels == i_physical_channels )
 402     {
 403         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 5,
 404                                p_aout->format.i_rate, true )
 405             == VLC_SUCCESS )
 406         {
 407             val.i_int = AOUT_VAR_3F2R;
 408             text.psz_string = _("3 Front 2 Rear");
 409             var_Change( p_aout, "audio-device",
 410                         VLC_VAR_ADDCHOICE, &val, &text );
 411             if(!is_default_output_set)
 412             {
 413                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 414                 is_default_output_set = true;
 415             }
 416             msg_Dbg( p_aout, "device supports 5 channels" );
 417         }
 418     }
 419
 420     /* Test for 2 Front 2 Rear support */
 421     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 422                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 423     if( ( p_aout->format.i_physical_channels & i_physical_channels )
 424         == i_physical_channels )
 425     {
 426         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 427                                p_aout->format.i_rate, true )
 428             == VLC_SUCCESS )
 429         {
 430             val.i_int = AOUT_VAR_2F2R;
 431             text.psz_string = _("2 Front 2 Rear");
 432             var_Change( p_aout, "audio-device",
 433                         VLC_VAR_ADDCHOICE, &val, &text );
 434             if(!is_default_output_set)
 435             {
 436                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 437                 is_default_output_set = true;
 438             }
 439             msg_Dbg( p_aout, "device supports 4 channels" );
 440         }
 441     }
 442
 443     /* Test for stereo support */
 444     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 445     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 446                            p_aout->format.i_rate, true )
 447         == VLC_SUCCESS )
 448     {
 449         val.i_int = AOUT_VAR_STEREO;
 450         text.psz_string = _("Stereo");
 451         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 452         if(!is_default_output_set)
 453         {
 454             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 455             is_default_output_set = true;
 456             msg_Dbg( p_aout, "device supports 2 channels (DEFAULT!)" );
 457         }
 458         else msg_Dbg( p_aout, "device supports 2 channels" );
 459     }
 460
 461     /* Test for mono support */
 462     i_physical_channels = AOUT_CHAN_CENTER;
 463     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 464                            p_aout->format.i_rate, true )
 465         == VLC_SUCCESS )
 466     {
 467         val.i_int = AOUT_VAR_MONO;
 468         text.psz_string = _("Mono");
 469         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 470         msg_Dbg( p_aout, "device supports 1 channel" );
 471     }
 472
 473     /* Check the speaker configuration to determine which channel config should
 474      * be the default */
 475     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->sys->p_dsobject,
 476                                               &ui_speaker_config ) )
 477     {
 478         ui_speaker_config = DSSPEAKER_STEREO;
 479         msg_Dbg( p_aout, "GetSpeakerConfig failed" );
 480     }
 481     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 482     {
 483     case DSSPEAKER_7POINT1:
 484         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 7.1" );
 485         val.i_int = AOUT_VAR_7_1;
 486         break;
 487     case DSSPEAKER_5POINT1:
 488         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 5.1" );
 489         val.i_int = AOUT_VAR_5_1;
 490         break;
 491     case DSSPEAKER_QUAD:
 492         msg_Dbg( p_aout, "Windows says your SpeakerConfig is Quad" );
 493         val.i_int = AOUT_VAR_2F2R;
 494         break;
 495 #if 0 /* Lots of people just get their settings wrong and complain that
 496        * this is a problem with VLC so just don't ever set mono by default. */
 497     case DSSPEAKER_MONO:
 498         val.i_int = AOUT_VAR_MONO;
 499         break;
 500 #endif
 501     case DSSPEAKER_SURROUND:
 502         msg_Dbg( p_aout, "Windows says your SpeakerConfig is surround" );
 503     case DSSPEAKER_STEREO:
 504         msg_Dbg( p_aout, "Windows says your SpeakerConfig is stereo" );
 505     default:
 506         /* If nothing else is found, choose stereo output */
 507         val.i_int = AOUT_VAR_STEREO;
 508         break;
 509     }
 510
 511     /* Check if we want to override speaker config */
 512     switch( p_aout->sys->i_speaker_setup )
 513     {
 514     case 0: /* Default value aka Windows default speaker setup */
 515         break;
 516     case 1: /* Mono */
 517         msg_Dbg( p_aout, "SpeakerConfig is forced to Mono" );
 518         val.i_int = AOUT_VAR_MONO;
 519         break;
 520     case 2: /* Stereo */
 521         msg_Dbg( p_aout, "SpeakerConfig is forced to Stereo" );
 522         val.i_int = AOUT_VAR_STEREO;
 523         break;
 524     case 3: /* Quad */
 525         msg_Dbg( p_aout, "SpeakerConfig is forced to Quad" );
 526         val.i_int = AOUT_VAR_2F2R;
 527         break;
 528     case 4: /* 5.1 */
 529         msg_Dbg( p_aout, "SpeakerConfig is forced to 5.1" );
 530         val.i_int = AOUT_VAR_5_1;
 531         break;
 532     case 5: /* 7.1 */
 533         msg_Dbg( p_aout, "SpeakerConfig is forced to 7.1" );
 534         val.i_int = AOUT_VAR_7_1;
 535         break;
 536     default:
 537         msg_Dbg( p_aout, "SpeakerConfig is forced to non-existing value" );
 538         break;
 539     }
 540
 541     var_Set( p_aout, "audio-device", val );
 542
 543     /* Test for SPDIF support */
 544     if ( AOUT_FMT_SPDIF( &p_aout->format ) )
 545     {
 546         if( CreateDSBuffer( p_aout, VLC_CODEC_SPDIFL,
 547                             p_aout->format.i_physical_channels,
 548                             aout_FormatNbChannels( &p_aout->format ),
 549                             p_aout->format.i_rate,
 550                             AOUT_SPDIF_SIZE, true )
 551             == VLC_SUCCESS )
 552         {
 553             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 554             val.i_int = AOUT_VAR_SPDIF;
 555             text.psz_string = _("A/52 over S/PDIF");
 556             var_Change( p_aout, "audio-device",
 557                         VLC_VAR_ADDCHOICE, &val, &text );
 558             if( var_InheritBool( p_aout, "spdif" ) )
 559                 var_Set( p_aout, "audio-device", val );
 560         }
 561     }
 562
 563     var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
 564     if( val.i_int <= 0 )
 565     {
 566         /* Probe() has failed. */
 567         var_Destroy( p_aout, "audio-device" );
 568         return;
 569     }
 570
 571     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 572 }
 573
 574 /*****************************************************************************
 575  * Play: we'll start playing the directsound buffer here because at least here
 576  *       we know the first buffer has been put in the aout fifo and we also
 577  *       know its date.
 578  *****************************************************************************/
 579 static void Play( audio_output_t *p_aout, block_t *p_buffer,
 580                   mtime_t *restrict drift )
 581 {
 582     /* get the playing date of the first aout buffer */
 583     p_aout->sys->notif.start_date = p_buffer->i_pts;
 584
 585     /* fill in the first samples (zeroes) */
 586     FillBuffer( p_aout, 0, NULL );
 587
 588     /* wake up the audio output thread */
 589     SetEvent( p_aout->sys->notif.event );
 590
 591     aout_PacketPlay( p_aout, p_buffer, drift );
 592     p_aout->pf_play = aout_PacketPlay;
 593 }
 594
 595 static int VolumeSet( audio_output_t *p_aout, float vol )
 596 {
 597     aout_sys_t *sys = p_aout->sys;
 598     int ret = 0;
 599
 600     /* Convert UI volume to linear factor (cube) */
 601     vol = vol * vol * vol;
 602
 603     /* millibels from linear amplification */
 604     LONG mb = lroundf(2000.f * log10f(vol));
 605
 606     /* Clamp to allowed DirectSound range */
 607     static_assert( DSBVOLUME_MIN < DSBVOLUME_MAX, "DSBVOLUME_* confused" );
 608     if( mb >= DSBVOLUME_MAX )
 609     {
 610         mb = DSBVOLUME_MAX;
 611         ret = -1;
 612     }
 613     if( mb <= DSBVOLUME_MIN )
 614         mb = DSBVOLUME_MIN;
 615
 616     sys->volume.mb = mb;
 617     if (!sys->volume.mute)
 618         InterlockedExchange(&sys->volume.volume, mb);
 619
 620     /* Convert back to UI volume */
 621     vol = cbrtf(powf(10.f, ((float)mb) / 2000.f));
 622     aout_VolumeReport( p_aout, vol );
 623     return ret;
 624 }
 625
 626 static int MuteSet( audio_output_t *p_aout, bool mute )
 627 {
 628     aout_sys_t *sys = p_aout->sys;
 629
 630     sys->volume.mute = mute;
 631     InterlockedExchange(&sys->volume.volume,
 632                         mute ? DSBVOLUME_MIN : sys->volume.mb);
 633
 634     aout_MuteReport( p_aout, mute );
 635     return 0;
 636 }
 637
 638 /*****************************************************************************
 639  * CloseAudio: close the audio device
 640  *****************************************************************************/
 641 static void CloseAudio( vlc_object_t *p_this )
 642 {
 643     audio_output_t * p_aout = (audio_output_t *)p_this;
 644     aout_sys_t *p_sys = p_aout->sys;
 645
 646     msg_Dbg( p_aout, "closing audio device" );
 647
 648     /* kill the position notification thread, if any */
 649     if( p_sys->notif.event != NULL )
 650     {
 651         vlc_atomic_set(&p_aout->sys->notif.abort, 1);
 652         /* wake up the audio thread if needed */
 653         if( p_aout->pf_play == Play )
 654             SetEvent( p_sys->notif.event );
 655
 656         vlc_join( p_sys->notif.thread, NULL );
 657         CloseHandle( p_sys->notif.event );
 658         aout_PacketDestroy( p_aout );
 659     }
 660
 661     /* release the secondary buffer */
 662     DestroyDSBuffer( p_aout );
 663
 664     /* finally release the DirectSound object */
 665     if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
 666
 667     /* free DSOUND.DLL */
 668     if( p_sys->hdsound_dll ) FreeLibrary( p_sys->hdsound_dll );
 669
 670     free( p_aout->sys->p_device_guid );
 671     free( p_sys );
 672 }
 673
 674 /*****************************************************************************
 675  * CallBackDirectSoundEnum: callback to enumerate available devices
 676  *****************************************************************************/
 677 static int CALLBACK CallBackDirectSoundEnum( LPGUID p_guid, LPCWSTR psz_desc,
 678                                              LPCWSTR psz_mod, LPVOID _p_aout )
 679 {
 680     VLC_UNUSED( psz_mod );
 681
 682     audio_output_t *p_aout = (audio_output_t *)_p_aout;
 683
 684     char *psz_device = FromWide( psz_desc );
 685     msg_Dbg( p_aout, "found device: %s", psz_device );
 686
 687     if( p_aout->sys->psz_device &&
 688         !strcmp(p_aout->sys->psz_device, psz_device) && p_guid )
 689     {
 690         /* Use the device corresponding to psz_device */
 691         p_aout->sys->p_device_guid = malloc( sizeof( GUID ) );
 692         *p_aout->sys->p_device_guid = *p_guid;
 693         msg_Dbg( p_aout, "using device: %s", psz_device );
 694     }
 695     else
 696     {
 697         /* If no default device has been selected, chose the first one */
 698         if( !p_aout->sys->psz_device && p_guid )
 699         {
 700             p_aout->sys->psz_device = strdup( psz_device );
 701             p_aout->sys->p_device_guid = malloc( sizeof( GUID ) );
 702             *p_aout->sys->p_device_guid = *p_guid;
 703             msg_Dbg( p_aout, "using device: %s", psz_device );
 704         }
 705     }
 706
 707     free( psz_device );
 708     return true;
 709 }
 710
 711 /*****************************************************************************
 712  * InitDirectSound: handle all the gory details of DirectSound initialisation
 713  *****************************************************************************/
 714 static int InitDirectSound( audio_output_t *p_aout )
 715 {
 716     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 717     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACKW, LPVOID);
 718
 719     p_aout->sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 720     if( p_aout->sys->hdsound_dll == NULL )
 721     {
 722         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 723         goto error;
 724     }
 725
 726     OurDirectSoundCreate = (void *)
 727         GetProcAddress( p_aout->sys->hdsound_dll,
 728                         "DirectSoundCreate" );
 729     if( OurDirectSoundCreate == NULL )
 730     {
 731         msg_Warn( p_aout, "GetProcAddress FAILED" );
 732         goto error;
 733     }
 734
 735     /* Get DirectSoundEnumerate */
 736     OurDirectSoundEnumerate = (void *)
 737        GetProcAddress( p_aout->sys->hdsound_dll,
 738                        "DirectSoundEnumerateW" );
 739     if( OurDirectSoundEnumerate )
 740     {
 741         p_aout->sys->psz_device = var_InheritString(p_aout, "directx-audio-device");
 742         /* Attempt enumeration */
 743         if( FAILED( OurDirectSoundEnumerate( CallBackDirectSoundEnum,
 744                                              p_aout ) ) )
 745         {
 746             msg_Dbg( p_aout, "enumeration of DirectSound devices failed" );
 747         }
 748     }
 749
 750     /* Create the direct sound object */
 751     if FAILED( OurDirectSoundCreate( p_aout->sys->p_device_guid,
 752                                      &p_aout->sys->p_dsobject,
 753                                      NULL ) )
 754     {
 755         msg_Warn( p_aout, "cannot create a direct sound device" );
 756         goto error;
 757     }
 758
 759     /* Set DirectSound Cooperative level, ie what control we want over Windows
 760      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 761      * settings of the primary buffer, but also that only the sound of our
 762      * application will be hearable when it will have the focus.
 763      * !!! (this is not really working as intended yet because to set the
 764      * cooperative level you need the window handle of your application, and
 765      * I don't know of any easy way to get it. Especially since we might play
 766      * sound without any video, and so what window handle should we use ???
 767      * The hack for now is to use the Desktop window handle - it seems to be
 768      * working */
 769     if( IDirectSound_SetCooperativeLevel( p_aout->sys->p_dsobject,
 770                                           GetDesktopWindow(),
 771                                           DSSCL_EXCLUSIVE) )
 772     {
 773         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 774     }
 775
 776     return VLC_SUCCESS;
 777
 778  error:
 779     p_aout->sys->p_dsobject = NULL;
 780     if( p_aout->sys->hdsound_dll )
 781     {
 782         FreeLibrary( p_aout->sys->hdsound_dll );
 783         p_aout->sys->hdsound_dll = NULL;
 784     }
 785     return VLC_EGENERIC;
 786
 787 }
 788
 789 /*****************************************************************************
 790  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 791  *****************************************************************************
 792  * This function creates the buffer we'll use to play audio.
 793  * In DirectSound there are two kinds of buffers:
 794  * - the primary buffer: which is the actual buffer that the soundcard plays
 795  * - the secondary buffer(s): these buffers are the one actually used by
 796  *    applications and DirectSound takes care of mixing them into the primary.
 797  *
 798  * Once you create a secondary buffer, you cannot change its format anymore so
 799  * you have to release the current one and create another.
 800  *****************************************************************************/
 801 static int CreateDSBuffer( audio_output_t *p_aout, int i_format,
 802                            int i_channels, int i_nb_channels, int i_rate,
 803                            int i_bytes_per_frame, bool b_probe )
 804 {
 805     WAVEFORMATEXTENSIBLE waveformat;
 806     DSBUFFERDESC         dsbdesc;
 807     unsigned int         i;
 808
 809     /* First set the sound buffer format */
 810     waveformat.dwChannelMask = 0;
 811     for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
 812     {
 813         if( i_channels & pi_channels_src[i] )
 814             waveformat.dwChannelMask |= pi_channels_in[i];
 815     }
 816
 817     switch( i_format )
 818     {
 819     case VLC_CODEC_SPDIFL:
 820         i_nb_channels = 2;
 821         /* To prevent channel re-ordering */
 822         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 823         waveformat.Format.wBitsPerSample = 16;
 824         waveformat.Samples.wValidBitsPerSample =
 825             waveformat.Format.wBitsPerSample;
 826         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 827         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 828         break;
 829
 830     case VLC_CODEC_FL32:
 831         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 832         waveformat.Samples.wValidBitsPerSample =
 833             waveformat.Format.wBitsPerSample;
 834         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 835         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 836         break;
 837
 838     case VLC_CODEC_S16L:
 839         waveformat.Format.wBitsPerSample = 16;
 840         waveformat.Samples.wValidBitsPerSample =
 841             waveformat.Format.wBitsPerSample;
 842         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 843         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 844         break;
 845     }
 846
 847     waveformat.Format.nChannels = i_nb_channels;
 848     waveformat.Format.nSamplesPerSec = i_rate;
 849     waveformat.Format.nBlockAlign =
 850         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 851     waveformat.Format.nAvgBytesPerSec =
 852         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 853
 854     p_aout->sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
 855     p_aout->sys->i_channels = i_nb_channels;
 856
 857     /* Then fill in the direct sound descriptor */
 858     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 859     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 860     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 861                     | DSBCAPS_GLOBALFOCUS       /* Allows background playing */
 862                     | DSBCAPS_CTRLVOLUME;       /* Allows volume control */
 863
 864     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 865     if( i_nb_channels <= 2 )
 866     {
 867         waveformat.Format.cbSize = 0;
 868     }
 869     else
 870     {
 871         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 872         waveformat.Format.cbSize =
 873             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 874
 875         /* Needed for 5.1 on emu101k */
 876         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 877     }
 878
 879     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 880     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 881
 882     if FAILED( IDirectSound_CreateSoundBuffer(
 883                    p_aout->sys->p_dsobject, &dsbdesc,
 884                    &p_aout->sys->p_dsbuffer, NULL) )
 885     {
 886         if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
 887         {
 888             /* Try without DSBCAPS_LOCHARDWARE */
 889             dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 890             if FAILED( IDirectSound_CreateSoundBuffer(
 891                    p_aout->sys->p_dsobject, &dsbdesc,
 892                    &p_aout->sys->p_dsbuffer, NULL) )
 893             {
 894                 return VLC_EGENERIC;
 895             }
 896             if( !b_probe )
 897                 msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
 898         }
 899         else
 900         {
 901             return VLC_EGENERIC;
 902         }
 903     }
 904
 905     /* Stop here if we were just probing */
 906     if( b_probe )
 907     {
 908         IDirectSoundBuffer_Release( p_aout->sys->p_dsbuffer );
 909         p_aout->sys->p_dsbuffer = NULL;
 910         return VLC_SUCCESS;
 911     }
 912
 913     p_aout->sys->i_frame_size = i_bytes_per_frame;
 914     p_aout->sys->i_channel_mask = waveformat.dwChannelMask;
 915     p_aout->sys->b_chan_reorder =
 916         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
 917                                   waveformat.dwChannelMask, i_nb_channels,
 918                                   p_aout->sys->pi_chan_table );
 919
 920     if( p_aout->sys->b_chan_reorder )
 921     {
 922         msg_Dbg( p_aout, "channel reordering needed" );
 923     }
 924
 925     return VLC_SUCCESS;
 926 }
 927
 928 /*****************************************************************************
 929  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 930  *****************************************************************************
 931  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 932  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 933  ****************************************************************************/
 934 static int CreateDSBufferPCM( audio_output_t *p_aout, vlc_fourcc_t *i_format,
 935                               int i_channels, int i_nb_channels, int i_rate,
 936                               bool b_probe )
 937 {
 938     /* Float32 audio samples are not supported for 5.1 output on the emu101k */
 939     if( !var_GetBool( p_aout, "directx-audio-float32" ) ||
 940         i_nb_channels > 2 ||
 941         CreateDSBuffer( p_aout, VLC_CODEC_FL32,
 942                         i_channels, i_nb_channels, i_rate,
 943                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 944         != VLC_SUCCESS )
 945     {
 946         if ( CreateDSBuffer( p_aout, VLC_CODEC_S16L,
 947                              i_channels, i_nb_channels, i_rate,
 948                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 949              != VLC_SUCCESS )
 950         {
 951             return VLC_EGENERIC;
 952         }
 953         else
 954         {
 955             *i_format = VLC_CODEC_S16L;
 956             return VLC_SUCCESS;
 957         }
 958     }
 959     else
 960     {
 961         *i_format = VLC_CODEC_FL32;
 962         return VLC_SUCCESS;
 963     }
 964 }
 965
 966 /*****************************************************************************
 967  * DestroyDSBuffer
 968  *****************************************************************************
 969  * This function destroys the secondary buffer.
 970  *****************************************************************************/
 971 static void DestroyDSBuffer( audio_output_t *p_aout )
 972 {
 973     if( p_aout->sys->p_dsbuffer )
 974     {
 975         IDirectSoundBuffer_Release( p_aout->sys->p_dsbuffer );
 976         p_aout->sys->p_dsbuffer = NULL;
 977     }
 978 }
 979
 980 /*****************************************************************************
 981  * FillBuffer: Fill in one of the direct sound frame buffers.
 982  *****************************************************************************
 983  * Returns VLC_SUCCESS on success.
 984  *****************************************************************************/
 985 static int FillBuffer( audio_output_t *p_aout, int i_frame, block_t *p_buffer )
 986 {
 987     aout_sys_t *p_sys = p_aout->sys;
 988     notification_thread_t *p_notif = &p_sys->notif;
 989     void *p_write_position, *p_wrap_around;
 990     unsigned long l_bytes1, l_bytes2;
 991     HRESULT dsresult;
 992
 993     /* Before copying anything, we have to lock the buffer */
 994     dsresult = IDirectSoundBuffer_Lock(
 995                 p_sys->p_dsbuffer,                              /* DS buffer */
 996                 i_frame * p_notif->i_frame_size,             /* Start offset */
 997                 p_notif->i_frame_size,                    /* Number of bytes */
 998                 &p_write_position,                  /* Address of lock start */
 999                 &l_bytes1,       /* Count of bytes locked before wrap around */
1000                 &p_wrap_around,           /* Buffer address (if wrap around) */
1001                 &l_bytes2,               /* Count of bytes after wrap around */
1002                 0 );                                                /* Flags */
1003     if( dsresult == DSERR_BUFFERLOST )
1004     {
1005         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
1006         dsresult = IDirectSoundBuffer_Lock(
1007                                p_sys->p_dsbuffer,
1008                                i_frame * p_notif->i_frame_size,
1009                                p_notif->i_frame_size,
1010                                &p_write_position,
1011                                &l_bytes1,
1012                                &p_wrap_around,
1013                                &l_bytes2,
1014                                0 );
1015     }
1016     if( dsresult != DS_OK )
1017     {
1018         msg_Warn( p_aout, "cannot lock buffer" );
1019         if( p_buffer ) block_Release( p_buffer );
1020         return VLC_EGENERIC;
1021     }
1022
1023     if( p_buffer == NULL )
1024     {
1025         memset( p_write_position, 0, l_bytes1 );
1026     }
1027     else
1028     {
1029         if( p_sys->b_chan_reorder )
1030         {
1031             /* Do the channel reordering here */
1032             aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_buffer,
1033                                  p_sys->i_channels, p_sys->pi_chan_table,
1034                                  p_sys->i_bits_per_sample );
1035         }
1036
1037         memcpy( p_write_position, p_buffer->p_buffer, l_bytes1 );
1038         block_Release( p_buffer );
1039     }
1040
1041     /* Now the data has been copied, unlock the buffer */
1042     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
1043                                p_wrap_around, l_bytes2 );
1044
1045     p_notif->i_write_slot = (i_frame + 1) % FRAMES_NUM;
1046     return VLC_SUCCESS;
1047 }
1048
1049 /*****************************************************************************
1050  * DirectSoundThread: this thread will capture play notification events.
1051  *****************************************************************************
1052  * We use this thread to emulate a callback mechanism. The thread probes for
1053  * event notification and fills up the DS secondary buffer when needed.
1054  *****************************************************************************/
1055 static void* DirectSoundThread( void *data )
1056 {
1057     audio_output_t *p_aout = (audio_output_t *)data;
1058     notification_thread_t *p_notif = &p_aout->sys->notif;
1059     mtime_t last_time;
1060
1061     msg_Dbg( p_aout, "DirectSoundThread ready" );
1062
1063     /* Wait here until Play() is called */
1064     WaitForSingleObject( p_notif->event, INFINITE );
1065
1066     if( !vlc_atomic_get( &p_notif->abort) )
1067     {
1068         HRESULT dsresult;
1069         mwait( p_notif->start_date - AOUT_MAX_PTS_ADVANCE / 2 );
1070
1071         /* start playing the buffer */
1072         dsresult = IDirectSoundBuffer_Play( p_aout->sys->p_dsbuffer,
1073                                         0,                         /* Unused */
1074                                         0,                         /* Unused */
1075                                         DSBPLAY_LOOPING );          /* Flags */
1076         if( dsresult == DSERR_BUFFERLOST )
1077         {
1078             IDirectSoundBuffer_Restore( p_aout->sys->p_dsbuffer );
1079             dsresult = IDirectSoundBuffer_Play(
1080                                             p_aout->sys->p_dsbuffer,
1081                                             0,                     /* Unused */
1082                                             0,                     /* Unused */
1083                                             DSBPLAY_LOOPING );      /* Flags */
1084         }
1085         if( dsresult != DS_OK )
1086         {
1087             msg_Err( p_aout, "cannot start playing buffer" );
1088         }
1089     }
1090     last_time = mdate();
1091
1092     while( !vlc_atomic_get( &p_notif->abort ) )
1093     {
1094         DWORD l_read;
1095         int l_queued = 0, l_free_slots;
1096         unsigned i_frame_siz = p_aout->sys->packet.samples;
1097         mtime_t mtime = mdate();
1098         int i;
1099
1100         /* Update volume if required */
1101         LONG volume = InterlockedExchange( &p_aout->sys->volume.volume, -1 );
1102         if( unlikely(volume != -1) )
1103             IDirectSoundBuffer_SetVolume( p_aout->sys->p_dsbuffer, volume );
1104
1105         /*
1106          * Fill in as much audio data as we can in our circular buffer
1107          */
1108
1109         /* Find out current play position */
1110         if FAILED( IDirectSoundBuffer_GetCurrentPosition(
1111                    p_aout->sys->p_dsbuffer, &l_read, NULL ) )
1112         {
1113             msg_Err( p_aout, "GetCurrentPosition() failed!" );
1114             l_read = 0;
1115         }
1116
1117         /* Detect underruns */
1118         if( l_queued && mtime - last_time >
1119             INT64_C(1000000) * l_queued / p_aout->format.i_rate )
1120         {
1121             msg_Dbg( p_aout, "detected underrun!" );
1122         }
1123         last_time = mtime;
1124
1125         /* Try to fill in as many frame buffers as possible */
1126         l_read /= (p_aout->format.i_bytes_per_frame /
1127             p_aout->format.i_frame_length);
1128         l_queued = p_notif->i_write_slot * i_frame_siz - l_read;
1129         if( l_queued < 0 ) l_queued += (i_frame_siz * FRAMES_NUM);
1130         l_free_slots = (FRAMES_NUM * i_frame_siz - l_queued) / i_frame_siz;
1131
1132         for( i = 0; i < l_free_slots; i++ )
1133         {
1134             block_t *p_buffer = aout_PacketNext( p_aout,
1135                 mtime + INT64_C(1000000) * (i * i_frame_siz + l_queued) /
1136                 p_aout->format.i_rate );
1137
1138             /* If there is no audio data available and we have some buffered
1139              * already, then just wait for the next time */
1140             if( !p_buffer && (i || l_queued / i_frame_siz) ) break;
1141
1142             if( FillBuffer( p_aout, p_notif->i_write_slot % FRAMES_NUM,
1143                             p_buffer ) != VLC_SUCCESS ) break;
1144         }
1145
1146         /* Sleep a reasonable amount of time */
1147         l_queued += (i * i_frame_siz);
1148         msleep( INT64_C(1000000) * l_queued / p_aout->format.i_rate / 2 );
1149     }
1150
1151     /* make sure the buffer isn't playing */
1152     IDirectSoundBuffer_Stop( p_aout->sys->p_dsbuffer );
1153
1154     msg_Dbg( p_aout, "DirectSoundThread exiting" );
1155     return NULL;
1156 }
1157
1158 /*****************************************************************************
1159  * CallBackConfigNBEnum: callback to get the number of available devices
1160  *****************************************************************************/
1161 static int CALLBACK CallBackConfigNBEnum( LPGUID p_guid, LPCWSTR psz_desc,
1162                                              LPCWSTR psz_mod, LPVOID p_nb )
1163 {
1164     VLC_UNUSED( psz_mod ); VLC_UNUSED( psz_desc ); VLC_UNUSED( p_guid );
1165
1166     int * a = (int *)p_nb;
1167     (*a)++;
1168     return true;
1169 }
1170
1171 /*****************************************************************************
1172  * CallBackConfigEnum: callback to add available devices to the preferences list
1173  *****************************************************************************/
1174 static int CALLBACK CallBackConfigEnum( LPGUID p_guid, LPCWSTR psz_desc,
1175                                              LPCWSTR psz_mod, LPVOID _p_item )
1176 {
1177     VLC_UNUSED( psz_mod ); VLC_UNUSED( p_guid );
1178
1179     module_config_t *p_item = (module_config_t *) _p_item;
1180
1181     p_item->ppsz_list[p_item->i_list] = FromWide( psz_desc );
1182     p_item->ppsz_list_text[p_item->i_list] = FromWide( psz_desc );
1183     p_item->i_list++;
1184     return true;
1185 }
1186
1187 /*****************************************************************************
1188  * ReloadDirectXDevices: store the list of devices in preferences
1189  *****************************************************************************/
1190 static int ReloadDirectXDevices( vlc_object_t *p_this, char const *psz_name,
1191                                  vlc_value_t newval, vlc_value_t oldval, void *data )
1192 {
1193     VLC_UNUSED( newval ); VLC_UNUSED( oldval ); VLC_UNUSED( data );
1194
1195     module_config_t *p_item = config_FindConfig( p_this, psz_name );
1196     if( !p_item ) return VLC_SUCCESS;
1197
1198     /* Clear-up the current list */
1199     if( p_item->i_list )
1200     {
1201         for( int i = 0; i < p_item->i_list; i++ )
1202         {
1203             free((char *)(p_item->ppsz_list[i]) );
1204             free((char *)(p_item->ppsz_list_text[i]) );
1205         }
1206     }
1207
1208     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACKW, LPVOID);
1209
1210     HANDLE hdsound_dll = LoadLibrary("DSOUND.DLL");
1211     if( hdsound_dll == NULL )
1212     {
1213         msg_Warn( p_this, "cannot open DSOUND.DLL" );
1214         return VLC_SUCCESS;
1215     }
1216
1217     /* Get DirectSoundEnumerate */
1218     OurDirectSoundEnumerate = (void *)
1219                     GetProcAddress( hdsound_dll, "DirectSoundEnumerateW" );
1220
1221     if( OurDirectSoundEnumerate == NULL )
1222         goto error;
1223
1224     int nb_devices = 0;
1225     OurDirectSoundEnumerate(CallBackConfigNBEnum, &nb_devices);
1226     msg_Dbg(p_this,"found %d devices", nb_devices);
1227
1228     p_item->ppsz_list = xrealloc( p_item->ppsz_list,
1229                                   nb_devices * sizeof(char *) );
1230     p_item->ppsz_list_text = xrealloc( p_item->ppsz_list_text,
1231                                   nb_devices * sizeof(char *) );
1232
1233     p_item->i_list = 0;
1234     OurDirectSoundEnumerate(CallBackConfigEnum, p_item);
1235
1236 error:
1237     FreeLibrary(hdsound_dll);
1238
1239     return VLC_SUCCESS;
1240 }
1241