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 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
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_aout.h>
  36
  37 #include <windows.h>
  38 #include <mmsystem.h>
  39 #include <dsound.h>
  40
  41 #define FRAME_SIZE ((int)p_aout->output.output.i_rate/20) /* Size in samples */
  42 #define FRAMES_NUM 8                                      /* Needs to be > 3 */
  43
  44 /*****************************************************************************
  45  * DirectSound GUIDs.
  46  * Defining them here allows us to get rid of the dxguid library during
  47  * the linking stage.
  48  *****************************************************************************/
  49 #include <initguid.h>
  50
  51 /*****************************************************************************
  52  * Useful macros
  53  *****************************************************************************/
  54 #ifndef WAVE_FORMAT_IEEE_FLOAT
  55 #   define WAVE_FORMAT_IEEE_FLOAT 0x0003
  56 #endif
  57
  58 #ifndef WAVE_FORMAT_DOLBY_AC3_SPDIF
  59 #   define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
  60 #endif
  61
  62 #ifndef WAVE_FORMAT_EXTENSIBLE
  63 #define  WAVE_FORMAT_EXTENSIBLE   0xFFFE
  64 #endif
  65
  66 #ifndef SPEAKER_FRONT_LEFT
  67 #   define SPEAKER_FRONT_LEFT             0x1
  68 #   define SPEAKER_FRONT_RIGHT            0x2
  69 #   define SPEAKER_FRONT_CENTER           0x4
  70 #   define SPEAKER_LOW_FREQUENCY          0x8
  71 #   define SPEAKER_BACK_LEFT              0x10
  72 #   define SPEAKER_BACK_RIGHT             0x20
  73 #   define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
  74 #   define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
  75 #   define SPEAKER_BACK_CENTER            0x100
  76 #   define SPEAKER_SIDE_LEFT              0x200
  77 #   define SPEAKER_SIDE_RIGHT             0x400
  78 #   define SPEAKER_TOP_CENTER             0x800
  79 #   define SPEAKER_TOP_FRONT_LEFT         0x1000
  80 #   define SPEAKER_TOP_FRONT_CENTER       0x2000
  81 #   define SPEAKER_TOP_FRONT_RIGHT        0x4000
  82 #   define SPEAKER_TOP_BACK_LEFT          0x8000
  83 #   define SPEAKER_TOP_BACK_CENTER        0x10000
  84 #   define SPEAKER_TOP_BACK_RIGHT         0x20000
  85 #   define SPEAKER_RESERVED               0x80000000
  86 #endif
  87
  88 #ifndef DSSPEAKER_DSSPEAKER_DIRECTOUT
  89 #   define DSSPEAKER_DSSPEAKER_DIRECTOUT         0x00000000
  90 #endif
  91 #ifndef DSSPEAKER_HEADPHONE
  92 #   define DSSPEAKER_HEADPHONE         0x00000001
  93 #endif
  94 #ifndef DSSPEAKER_MONO
  95 #   define DSSPEAKER_MONO              0x00000002
  96 #endif
  97 #ifndef DSSPEAKER_QUAD
  98 #   define DSSPEAKER_QUAD              0x00000003
  99 #endif
 100 #ifndef DSSPEAKER_STEREO
 101 #   define DSSPEAKER_STEREO            0x00000004
 102 #endif
 103 #ifndef DSSPEAKER_SURROUND
 104 #   define DSSPEAKER_SURROUND          0x00000005
 105 #endif
 106 #ifndef DSSPEAKER_5POINT1
 107 #   define DSSPEAKER_5POINT1           0x00000006
 108 #endif
 109 #ifndef DSSPEAKER_7POINT1
 110 #   define DSSPEAKER_7POINT1           0x00000007
 111 #endif
 112 #ifndef DSSPEAKER_7POINT1_SURROUND
 113 #   define DSSPEAKER_7POINT1_SURROUND           0x00000008
 114 #endif
 115 #ifndef DSSPEAKER_7POINT1_WIDE
 116 #   define DSSPEAKER_7POINT1_WIDE           DSSPEAKER_7POINT1
 117 #endif
 118
 119 #ifndef _WAVEFORMATEXTENSIBLE_
 120 typedef struct {
 121     WAVEFORMATEX    Format;
 122     union {
 123         WORD wValidBitsPerSample;       /* bits of precision  */
 124         WORD wSamplesPerBlock;          /* valid if wBitsPerSample==0 */
 125         WORD wReserved;                 /* If neither applies, set to zero. */
 126     } Samples;
 127     DWORD           dwChannelMask;      /* which channels are */
 128                                         /* present in stream  */
 129     GUID            SubFormat;
 130 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
 131 #endif
 132
 133 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, WAVE_FORMAT_IEEE_FLOAT, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 134 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_PCM, WAVE_FORMAT_PCM, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 135 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF, WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 136
 137 /*****************************************************************************
 138  * notification_thread_t: DirectX event thread
 139  *****************************************************************************/
 140 typedef struct notification_thread_t
 141 {
 142     VLC_COMMON_MEMBERS
 143
 144     aout_instance_t *p_aout;
 145     int i_frame_size;                          /* size in bytes of one frame */
 146     int i_write_slot;       /* current write position in our circular buffer */
 147
 148     mtime_t start_date;
 149     HANDLE event;
 150
 151 } notification_thread_t;
 152
 153 /*****************************************************************************
 154  * aout_sys_t: directx audio output method descriptor
 155  *****************************************************************************
 156  * This structure is part of the audio output thread descriptor.
 157  * It describes the direct sound specific properties of an audio device.
 158  *****************************************************************************/
 159 struct aout_sys_t
 160 {
 161     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
 162
 163     int                 i_device_id;                 /*  user defined device */
 164     LPGUID              p_device_guid;
 165
 166     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
 167     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
 168                                        * takes care of mixing all the
 169                                        * secondary buffers into the primary) */
 170
 171     notification_thread_t *p_notif;                  /* DirectSoundThread id */
 172
 173     int b_playing;                                         /* playing status */
 174
 175     int i_frame_size;                         /* Size in bytes of one frame */
 176
 177     bool b_chan_reorder;              /* do we need channel reordering */
 178     int pi_chan_table[AOUT_CHAN_MAX];
 179     uint32_t i_channel_mask;
 180     uint32_t i_bits_per_sample;
 181     uint32_t i_channels;
 182 };
 183
 184 static const uint32_t pi_channels_src[] =
 185     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 186       AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
 187       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
 188       AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 };
 189 static const uint32_t pi_channels_in[] =
 190     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 191       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT,
 192       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 193       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY, 0 };
 194 static const uint32_t pi_channels_out[] =
 195     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 196       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY,
 197       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 198       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT, 0 };
 199
 200 /*****************************************************************************
 201  * Local prototypes.
 202  *****************************************************************************/
 203 static int  OpenAudio  ( vlc_object_t * );
 204 static void CloseAudio ( vlc_object_t * );
 205 static void Play       ( aout_instance_t * );
 206
 207 /* local functions */
 208 static void Probe             ( aout_instance_t * );
 209 static int  InitDirectSound   ( aout_instance_t * );
 210 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, bool );
 211 static int  CreateDSBufferPCM ( aout_instance_t *, int*, int, int, int, bool );
 212 static void DestroyDSBuffer   ( aout_instance_t * );
 213 static void DirectSoundThread ( notification_thread_t * );
 214 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 215
 216 /*****************************************************************************
 217  * Module descriptor
 218  *****************************************************************************/
 219 #define DEVICE_TEXT N_("Output device")
 220 #define DEVICE_LONGTEXT N_( \
 221     "DirectX device number: 0 default device, 1..N device by number" \
 222     "(Note that the default device appears as 0 AND another number)." )
 223 #define FLOAT_TEXT N_("Use float32 output")
 224 #define FLOAT_LONGTEXT N_( \
 225     "The option allows you to enable or disable the high-quality float32 " \
 226     "audio output mode (which is not well supported by some soundcards)." )
 227
 228 vlc_module_begin();
 229     set_description( _("DirectX audio output") );
 230     set_shortname( "DirectX" );
 231     set_capability( "audio output", 100 );
 232     set_category( CAT_AUDIO );
 233     set_subcategory( SUBCAT_AUDIO_AOUT );
 234     add_shortcut( "directx" );
 235     add_integer( "directx-audio-device", 0, NULL, DEVICE_TEXT,
 236                  DEVICE_LONGTEXT, true );
 237     add_bool( "directx-audio-float32", 0, 0, FLOAT_TEXT,
 238               FLOAT_LONGTEXT, true );
 239     set_callbacks( OpenAudio, CloseAudio );
 240 vlc_module_end();
 241
 242 /*****************************************************************************
 243  * OpenAudio: open the audio device
 244  *****************************************************************************
 245  * This function opens and setups Direct Sound.
 246  *****************************************************************************/
 247 static int OpenAudio( vlc_object_t *p_this )
 248 {
 249     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 250     vlc_value_t val;
 251
 252     msg_Dbg( p_aout, "OpenAudio" );
 253
 254    /* Allocate structure */
 255     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 256     if( p_aout->output.p_sys == NULL )
 257     {
 258         msg_Err( p_aout, "out of memory" );
 259         return VLC_ENOMEM;
 260     }
 261
 262     /* Initialize some variables */
 263     p_aout->output.p_sys->p_dsobject = NULL;
 264     p_aout->output.p_sys->p_dsbuffer = NULL;
 265     p_aout->output.p_sys->p_notif = NULL;
 266     p_aout->output.p_sys->b_playing = 0;
 267
 268     p_aout->output.pf_play = Play;
 269     aout_VolumeSoftInit( p_aout );
 270
 271     /* Retrieve config values */
 272     var_Create( p_aout, "directx-audio-float32",
 273                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 274     var_Create( p_aout, "directx-audio-device",
 275                 VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
 276     var_Get( p_aout, "directx-audio-device", &val );
 277     p_aout->output.p_sys->i_device_id = val.i_int;
 278     p_aout->output.p_sys->p_device_guid = 0;
 279
 280     /* Initialise DirectSound */
 281     if( InitDirectSound( p_aout ) )
 282     {
 283         msg_Err( p_aout, "cannot initialize DirectSound" );
 284         goto error;
 285     }
 286
 287     if( var_Type( p_aout, "audio-device" ) == 0 )
 288     {
 289         Probe( p_aout );
 290     }
 291
 292     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 293     {
 294         /* Probe() has failed. */
 295         goto error;
 296     }
 297
 298     /* Open the device */
 299     if( val.i_int == AOUT_VAR_SPDIF )
 300     {
 301         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 302
 303         /* Calculate the frame size in bytes */
 304         p_aout->output.i_nb_samples = A52_FRAME_NB;
 305         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 306         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 307         p_aout->output.p_sys->i_frame_size =
 308             p_aout->output.output.i_bytes_per_frame;
 309
 310         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 311                             p_aout->output.output.i_physical_channels,
 312                             aout_FormatNbChannels( &p_aout->output.output ),
 313                             p_aout->output.output.i_rate,
 314                             p_aout->output.p_sys->i_frame_size, false )
 315             != VLC_SUCCESS )
 316         {
 317             msg_Err( p_aout, "cannot open directx audio device" );
 318             free( p_aout->output.p_sys );
 319             return VLC_EGENERIC;
 320         }
 321
 322         aout_VolumeNoneInit( p_aout );
 323     }
 324     else
 325     {
 326         if( val.i_int == AOUT_VAR_5_1 )
 327         {
 328             p_aout->output.output.i_physical_channels
 329                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 330                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 331                    | AOUT_CHAN_LFE;
 332         }
 333         else if( val.i_int == AOUT_VAR_7_1 )
 334         {
 335                     p_aout->output.output.i_physical_channels
 336                         = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 337                            | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 338                            | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
 339                            | AOUT_CHAN_LFE;
 340         }
 341         else if( val.i_int == AOUT_VAR_3F2R )
 342         {
 343             p_aout->output.output.i_physical_channels
 344                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 345                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 346         }
 347         else if( val.i_int == AOUT_VAR_2F2R )
 348         {
 349             p_aout->output.output.i_physical_channels
 350                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 351                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 352         }
 353         else if( val.i_int == AOUT_VAR_MONO )
 354         {
 355             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 356         }
 357         else
 358         {
 359             p_aout->output.output.i_physical_channels
 360                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 361         }
 362
 363         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 364                                p_aout->output.output.i_physical_channels,
 365                                aout_FormatNbChannels( &p_aout->output.output ),
 366                                p_aout->output.output.i_rate, false )
 367             != VLC_SUCCESS )
 368         {
 369             msg_Err( p_aout, "cannot open directx audio device" );
 370             free( p_aout->output.p_sys );
 371             return VLC_EGENERIC;
 372         }
 373
 374         /* Calculate the frame size in bytes */
 375         p_aout->output.i_nb_samples = FRAME_SIZE;
 376         aout_FormatPrepare( &p_aout->output.output );
 377         aout_VolumeSoftInit( p_aout );
 378     }
 379
 380     /* Now we need to setup our DirectSound play notification structure */
 381     p_aout->output.p_sys->p_notif =
 382         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 383     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 384
 385     p_aout->output.p_sys->p_notif->event = CreateEvent( 0, FALSE, FALSE, 0 );
 386     p_aout->output.p_sys->p_notif->i_frame_size =
 387         p_aout->output.p_sys->i_frame_size;
 388
 389     /* then launch the notification thread */
 390     msg_Dbg( p_aout, "creating DirectSoundThread" );
 391     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 392                            "DirectSound Notification Thread",
 393                            DirectSoundThread,
 394                            VLC_THREAD_PRIORITY_HIGHEST, false ) )
 395     {
 396         msg_Err( p_aout, "cannot create DirectSoundThread" );
 397         CloseHandle( p_aout->output.p_sys->p_notif->event );
 398         vlc_object_release( p_aout->output.p_sys->p_notif );
 399         p_aout->output.p_sys->p_notif = NULL;
 400         goto error;
 401     }
 402
 403     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 404
 405     return VLC_SUCCESS;
 406
 407  error:
 408     CloseAudio( VLC_OBJECT(p_aout) );
 409     return VLC_EGENERIC;
 410 }
 411
 412 /*****************************************************************************
 413  * Probe: probe the audio device for available formats and channels
 414  *****************************************************************************/
 415 static void Probe( aout_instance_t * p_aout )
 416 {
 417     vlc_value_t val, text;
 418     int i_format;
 419     unsigned int i_physical_channels;
 420     DWORD ui_speaker_config;
 421
 422     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 423     text.psz_string = _("Audio Device");
 424     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 425
 426     /* Test for 5.1 support */
 427     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 428                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 429                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 430     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 431     {
 432         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 433                                p_aout->output.output.i_rate, true )
 434             == VLC_SUCCESS )
 435         {
 436             val.i_int = AOUT_VAR_5_1;
 437             text.psz_string = "5.1";
 438             var_Change( p_aout, "audio-device",
 439                         VLC_VAR_ADDCHOICE, &val, &text );
 440             msg_Dbg( p_aout, "device supports 5.1 channels" );
 441         }
 442     }
 443
 444     /* Test for 7.1 support */
 445     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 446                              AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 447                              AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
 448                              AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 449        if( p_aout->output.output.i_physical_channels == i_physical_channels )
 450        {
 451            if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 8,
 452                                   p_aout->output.output.i_rate, true )
 453                == VLC_SUCCESS )
 454            {
 455                val.i_int = AOUT_VAR_7_1;
 456                text.psz_string = "7.1";
 457                var_Change( p_aout, "audio-device",
 458                            VLC_VAR_ADDCHOICE, &val, &text );
 459                msg_Dbg( p_aout, "device supports 7.1 channels" );
 460            }
 461        }
 462
 463     /* Test for 3 Front 2 Rear support */
 464     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 465                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 466                           AOUT_CHAN_REARRIGHT;
 467     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 468     {
 469         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 5,
 470                                p_aout->output.output.i_rate, true )
 471             == VLC_SUCCESS )
 472         {
 473             val.i_int = AOUT_VAR_3F2R;
 474             text.psz_string = N_("3 Front 2 Rear");
 475             var_Change( p_aout, "audio-device",
 476                         VLC_VAR_ADDCHOICE, &val, &text );
 477             msg_Dbg( p_aout, "device supports 5 channels" );
 478         }
 479     }
 480
 481     /* Test for 2 Front 2 Rear support */
 482     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 483                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 484     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 485         == i_physical_channels )
 486     {
 487         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 488                                p_aout->output.output.i_rate, true )
 489             == VLC_SUCCESS )
 490         {
 491             val.i_int = AOUT_VAR_2F2R;
 492             text.psz_string = N_("2 Front 2 Rear");
 493             var_Change( p_aout, "audio-device",
 494                         VLC_VAR_ADDCHOICE, &val, &text );
 495             msg_Dbg( p_aout, "device supports 4 channels" );
 496         }
 497     }
 498
 499     /* Test for stereo support */
 500     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 501     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 502                            p_aout->output.output.i_rate, true )
 503         == VLC_SUCCESS )
 504     {
 505         val.i_int = AOUT_VAR_STEREO;
 506         text.psz_string = N_("Stereo");
 507         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 508         var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 509         msg_Dbg( p_aout, "device supports 2 channels" );
 510     }
 511
 512     /* Test for mono support */
 513     i_physical_channels = AOUT_CHAN_CENTER;
 514     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 515                            p_aout->output.output.i_rate, true )
 516         == VLC_SUCCESS )
 517     {
 518         val.i_int = AOUT_VAR_MONO;
 519         text.psz_string = N_("Mono");
 520         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 521         msg_Dbg( p_aout, "device supports 1 channel" );
 522     }
 523
 524     /* Check the speaker configuration to determine which channel config should
 525      * be the default */
 526     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 527                                               &ui_speaker_config ) )
 528     {
 529         ui_speaker_config = DSSPEAKER_STEREO;
 530     }
 531     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 532     {
 533     case DSSPEAKER_7POINT1:
 534         val.i_int = AOUT_VAR_7_1;
 535         break;
 536     case DSSPEAKER_5POINT1:
 537         val.i_int = AOUT_VAR_5_1;
 538         break;
 539     case DSSPEAKER_QUAD:
 540         val.i_int = AOUT_VAR_2F2R;
 541         break;
 542 #if 0 /* Lots of people just get their settings wrong and complain that
 543        * this is a problem with VLC so just don't ever set mono by default. */
 544     case DSSPEAKER_MONO:
 545         val.i_int = AOUT_VAR_MONO;
 546         break;
 547 #endif
 548     case DSSPEAKER_SURROUND:
 549     case DSSPEAKER_STEREO:
 550     default:
 551         val.i_int = AOUT_VAR_STEREO;
 552         break;
 553     }
 554     var_Set( p_aout, "audio-device", val );
 555
 556     /* Test for SPDIF support */
 557     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 558     {
 559         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 560                             p_aout->output.output.i_physical_channels,
 561                             aout_FormatNbChannels( &p_aout->output.output ),
 562                             p_aout->output.output.i_rate,
 563                             AOUT_SPDIF_SIZE, true )
 564             == VLC_SUCCESS )
 565         {
 566             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 567             val.i_int = AOUT_VAR_SPDIF;
 568             text.psz_string = N_("A/52 over S/PDIF");
 569             var_Change( p_aout, "audio-device",
 570                         VLC_VAR_ADDCHOICE, &val, &text );
 571             if( config_GetInt( p_aout, "spdif" ) )
 572                 var_Set( p_aout, "audio-device", val );
 573         }
 574     }
 575
 576     var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
 577     if( val.i_int <= 0 )
 578     {
 579         /* Probe() has failed. */
 580         var_Destroy( p_aout, "audio-device" );
 581         return;
 582     }
 583
 584     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 585
 586     val.b_bool = true;
 587     var_Set( p_aout, "intf-change", val );
 588 }
 589
 590 /*****************************************************************************
 591  * Play: we'll start playing the directsound buffer here because at least here
 592  *       we know the first buffer has been put in the aout fifo and we also
 593  *       know its date.
 594  *****************************************************************************/
 595 static void Play( aout_instance_t *p_aout )
 596 {
 597     if( !p_aout->output.p_sys->b_playing )
 598     {
 599         aout_buffer_t *p_buffer;
 600         int i;
 601
 602         p_aout->output.p_sys->b_playing = 1;
 603
 604         /* get the playing date of the first aout buffer */
 605         p_aout->output.p_sys->p_notif->start_date =
 606             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 607
 608         /* fill in the first samples */
 609         for( i = 0; i < FRAMES_NUM; i++ )
 610         {
 611             p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 612             if( !p_buffer ) break;
 613             FillBuffer( p_aout, i, p_buffer );
 614         }
 615
 616         /* wake up the audio output thread */
 617         SetEvent( p_aout->output.p_sys->p_notif->event );
 618     }
 619 }
 620
 621 /*****************************************************************************
 622  * CloseAudio: close the audio device
 623  *****************************************************************************/
 624 static void CloseAudio( vlc_object_t *p_this )
 625 {
 626     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 627     aout_sys_t *p_sys = p_aout->output.p_sys;
 628
 629     msg_Dbg( p_aout, "closing audio device" );
 630
 631     /* kill the position notification thread, if any */
 632     if( p_sys->p_notif )
 633     {
 634         vlc_object_detach( p_sys->p_notif );
 635         vlc_object_kill( p_sys->p_notif );
 636         /* wake up the audio thread if needed */
 637         if( !p_sys->b_playing ) SetEvent( p_sys->p_notif->event );
 638
 639         vlc_thread_join( p_sys->p_notif );
 640         vlc_object_release( p_sys->p_notif );
 641     }
 642
 643     /* release the secondary buffer */
 644     DestroyDSBuffer( p_aout );
 645
 646     /* finally release the DirectSound object */
 647     if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
 648
 649     /* free DSOUND.DLL */
 650     if( p_sys->hdsound_dll ) FreeLibrary( p_sys->hdsound_dll );
 651
 652     free( p_aout->output.p_sys->p_device_guid );
 653     free( p_sys );
 654 }
 655
 656 /*****************************************************************************
 657  * CallBackDirectSoundEnum: callback to enumerate available devices
 658  *****************************************************************************/
 659 static int CALLBACK CallBackDirectSoundEnum( LPGUID p_guid, LPCSTR psz_desc,
 660                                              LPCSTR psz_mod, LPVOID _p_aout )
 661 {
 662     aout_instance_t *p_aout = (aout_instance_t *)_p_aout;
 663
 664     msg_Dbg( p_aout, "found device: %s", psz_desc );
 665
 666     if( p_aout->output.p_sys->i_device_id == 0 && p_guid )
 667     {
 668         p_aout->output.p_sys->p_device_guid = malloc( sizeof( GUID ) );
 669         *p_aout->output.p_sys->p_device_guid = *p_guid;
 670         msg_Dbg( p_aout, "using device: %s", psz_desc );
 671     }
 672
 673     p_aout->output.p_sys->i_device_id--;
 674     return 1;
 675 }
 676
 677 /*****************************************************************************
 678  * InitDirectSound: handle all the gory details of DirectSound initialisation
 679  *****************************************************************************/
 680 static int InitDirectSound( aout_instance_t *p_aout )
 681 {
 682     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 683     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACK, LPVOID);
 684
 685     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 686     if( p_aout->output.p_sys->hdsound_dll == NULL )
 687     {
 688         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 689         goto error;
 690     }
 691
 692     OurDirectSoundCreate = (void *)
 693         GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 694                         "DirectSoundCreate" );
 695     if( OurDirectSoundCreate == NULL )
 696     {
 697         msg_Warn( p_aout, "GetProcAddress FAILED" );
 698         goto error;
 699     }
 700
 701     /* Get DirectSoundEnumerate */
 702     OurDirectSoundEnumerate = (void *)
 703        GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 704                        "DirectSoundEnumerateA" );
 705     if( OurDirectSoundEnumerate )
 706     {
 707         /* Attempt enumeration */
 708         if( FAILED( OurDirectSoundEnumerate( CallBackDirectSoundEnum,
 709                                              p_aout ) ) )
 710         {
 711             msg_Dbg( p_aout, "enumeration of DirectSound devices failed" );
 712         }
 713     }
 714
 715     /* Create the direct sound object */
 716     if FAILED( OurDirectSoundCreate( p_aout->output.p_sys->p_device_guid,
 717                                      &p_aout->output.p_sys->p_dsobject,
 718                                      NULL ) )
 719     {
 720         msg_Warn( p_aout, "cannot create a direct sound device" );
 721         goto error;
 722     }
 723
 724     /* Set DirectSound Cooperative level, ie what control we want over Windows
 725      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 726      * settings of the primary buffer, but also that only the sound of our
 727      * application will be hearable when it will have the focus.
 728      * !!! (this is not really working as intended yet because to set the
 729      * cooperative level you need the window handle of your application, and
 730      * I don't know of any easy way to get it. Especially since we might play
 731      * sound without any video, and so what window handle should we use ???
 732      * The hack for now is to use the Desktop window handle - it seems to be
 733      * working */
 734     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 735                                           GetDesktopWindow(),
 736                                           DSSCL_EXCLUSIVE) )
 737     {
 738         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 739     }
 740
 741     return VLC_SUCCESS;
 742
 743  error:
 744     p_aout->output.p_sys->p_dsobject = NULL;
 745     if( p_aout->output.p_sys->hdsound_dll )
 746     {
 747         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 748         p_aout->output.p_sys->hdsound_dll = NULL;
 749     }
 750     return VLC_EGENERIC;
 751
 752 }
 753
 754 /*****************************************************************************
 755  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 756  *****************************************************************************
 757  * This function creates the buffer we'll use to play audio.
 758  * In DirectSound there are two kinds of buffers:
 759  * - the primary buffer: which is the actual buffer that the soundcard plays
 760  * - the secondary buffer(s): these buffers are the one actually used by
 761  *    applications and DirectSound takes care of mixing them into the primary.
 762  *
 763  * Once you create a secondary buffer, you cannot change its format anymore so
 764  * you have to release the current one and create another.
 765  *****************************************************************************/
 766 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 767                            int i_channels, int i_nb_channels, int i_rate,
 768                            int i_bytes_per_frame, bool b_probe )
 769 {
 770     WAVEFORMATEXTENSIBLE waveformat;
 771     DSBUFFERDESC         dsbdesc;
 772     unsigned int         i;
 773
 774     /* First set the sound buffer format */
 775     waveformat.dwChannelMask = 0;
 776     for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
 777     {
 778         if( i_channels & pi_channels_src[i] )
 779             waveformat.dwChannelMask |= pi_channels_in[i];
 780     }
 781
 782     switch( i_format )
 783     {
 784     case VLC_FOURCC('s','p','d','i'):
 785         i_nb_channels = 2;
 786         /* To prevent channel re-ordering */
 787         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 788         waveformat.Format.wBitsPerSample = 16;
 789         waveformat.Samples.wValidBitsPerSample =
 790             waveformat.Format.wBitsPerSample;
 791         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 792         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 793         break;
 794
 795     case VLC_FOURCC('f','l','3','2'):
 796         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 797         waveformat.Samples.wValidBitsPerSample =
 798             waveformat.Format.wBitsPerSample;
 799         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 800         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 801         break;
 802
 803     case VLC_FOURCC('s','1','6','l'):
 804         waveformat.Format.wBitsPerSample = 16;
 805         waveformat.Samples.wValidBitsPerSample =
 806             waveformat.Format.wBitsPerSample;
 807         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 808         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 809         break;
 810     }
 811
 812     waveformat.Format.nChannels = i_nb_channels;
 813     waveformat.Format.nSamplesPerSec = i_rate;
 814     waveformat.Format.nBlockAlign =
 815         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 816     waveformat.Format.nAvgBytesPerSec =
 817         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 818
 819     p_aout->output.p_sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
 820     p_aout->output.p_sys->i_channels = i_nb_channels;
 821
 822     /* Then fill in the direct sound descriptor */
 823     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 824     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 825     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 826                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 827
 828     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 829     if( i_nb_channels <= 2 )
 830     {
 831         waveformat.Format.cbSize = 0;
 832     }
 833     else
 834     {
 835         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 836         waveformat.Format.cbSize =
 837             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 838
 839         /* Needed for 5.1 on emu101k */
 840         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 841     }
 842
 843     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 844     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 845
 846     if FAILED( IDirectSound_CreateSoundBuffer(
 847                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 848                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 849     {
 850         if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
 851         {
 852             /* Try without DSBCAPS_LOCHARDWARE */
 853             dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 854             if FAILED( IDirectSound_CreateSoundBuffer(
 855                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 856                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 857             {
 858                 return VLC_EGENERIC;
 859             }
 860             if( !b_probe )
 861                 msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
 862         }
 863         else
 864         {
 865             return VLC_EGENERIC;
 866         }
 867     }
 868
 869     /* Stop here if we were just probing */
 870     if( b_probe )
 871     {
 872         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 873         p_aout->output.p_sys->p_dsbuffer = NULL;
 874         return VLC_SUCCESS;
 875     }
 876
 877     p_aout->output.p_sys->i_frame_size = i_bytes_per_frame;
 878     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 879     p_aout->output.p_sys->b_chan_reorder =
 880         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
 881                                   waveformat.dwChannelMask, i_nb_channels,
 882                                   p_aout->output.p_sys->pi_chan_table );
 883
 884     if( p_aout->output.p_sys->b_chan_reorder )
 885     {
 886         msg_Dbg( p_aout, "channel reordering needed" );
 887     }
 888
 889     return VLC_SUCCESS;
 890 }
 891
 892 /*****************************************************************************
 893  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 894  *****************************************************************************
 895  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 896  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 897  ****************************************************************************/
 898 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 899                               int i_channels, int i_nb_channels, int i_rate,
 900                               bool b_probe )
 901 {
 902     vlc_value_t val;
 903
 904     var_Get( p_aout, "directx-audio-float32", &val );
 905
 906     /* Float32 audio samples are not supported for 5.1 output on the emu101k */
 907
 908     if( !val.b_bool || i_nb_channels > 2 ||
 909         CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
 910                         i_channels, i_nb_channels, i_rate,
 911                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 912         != VLC_SUCCESS )
 913     {
 914         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
 915                              i_channels, i_nb_channels, i_rate,
 916                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 917              != VLC_SUCCESS )
 918         {
 919             return VLC_EGENERIC;
 920         }
 921         else
 922         {
 923             *i_format = VLC_FOURCC('s','1','6','l');
 924             return VLC_SUCCESS;
 925         }
 926     }
 927     else
 928     {
 929         *i_format = VLC_FOURCC('f','l','3','2');
 930         return VLC_SUCCESS;
 931     }
 932 }
 933
 934 /*****************************************************************************
 935  * DestroyDSBuffer
 936  *****************************************************************************
 937  * This function destroys the secondary buffer.
 938  *****************************************************************************/
 939 static void DestroyDSBuffer( aout_instance_t *p_aout )
 940 {
 941     if( p_aout->output.p_sys->p_dsbuffer )
 942     {
 943         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 944         p_aout->output.p_sys->p_dsbuffer = NULL;
 945     }
 946 }
 947
 948 /*****************************************************************************
 949  * FillBuffer: Fill in one of the direct sound frame buffers.
 950  *****************************************************************************
 951  * Returns VLC_SUCCESS on success.
 952  *****************************************************************************/
 953 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 954                        aout_buffer_t *p_buffer )
 955 {
 956     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 957     aout_sys_t *p_sys = p_aout->output.p_sys;
 958     void *p_write_position, *p_wrap_around;
 959     long l_bytes1, l_bytes2;
 960     HRESULT dsresult;
 961
 962     /* Before copying anything, we have to lock the buffer */
 963     dsresult = IDirectSoundBuffer_Lock(
 964                 p_sys->p_dsbuffer,                              /* DS buffer */
 965                 i_frame * p_notif->i_frame_size,             /* Start offset */
 966                 p_notif->i_frame_size,                    /* Number of bytes */
 967                 &p_write_position,                  /* Address of lock start */
 968                 &l_bytes1,       /* Count of bytes locked before wrap around */
 969                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 970                 &l_bytes2,               /* Count of bytes after wrap around */
 971                 0 );                                                /* Flags */
 972     if( dsresult == DSERR_BUFFERLOST )
 973     {
 974         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
 975         dsresult = IDirectSoundBuffer_Lock(
 976                                p_sys->p_dsbuffer,
 977                                i_frame * p_notif->i_frame_size,
 978                                p_notif->i_frame_size,
 979                                &p_write_position,
 980                                &l_bytes1,
 981                                &p_wrap_around,
 982                                &l_bytes2,
 983                                0 );
 984     }
 985     if( dsresult != DS_OK )
 986     {
 987         msg_Warn( p_notif, "cannot lock buffer" );
 988         if( p_buffer ) aout_BufferFree( p_buffer );
 989         return VLC_EGENERIC;
 990     }
 991
 992     if( p_buffer == NULL )
 993     {
 994         memset( p_write_position, 0, l_bytes1 );
 995     }
 996     else
 997     {
 998         if( p_sys->b_chan_reorder )
 999         {
1000             /* Do the channel reordering here */
1001             aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_nb_bytes,
1002                                  p_sys->i_channels, p_sys->pi_chan_table,
1003                                  p_sys->i_bits_per_sample );
1004         }
1005
1006         vlc_memcpy( p_write_position, p_buffer->p_buffer, l_bytes1 );
1007         aout_BufferFree( p_buffer );
1008     }
1009
1010     /* Now the data has been copied, unlock the buffer */
1011     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
1012                                p_wrap_around, l_bytes2 );
1013
1014     p_notif->i_write_slot = (i_frame + 1) % FRAMES_NUM;
1015     return VLC_SUCCESS;
1016 }
1017
1018 /*****************************************************************************
1019  * DirectSoundThread: this thread will capture play notification events.
1020  *****************************************************************************
1021  * We use this thread to emulate a callback mechanism. The thread probes for
1022  * event notification and fills up the DS secondary buffer when needed.
1023  *****************************************************************************/
1024 static void DirectSoundThread( notification_thread_t *p_notif )
1025 {
1026     aout_instance_t *p_aout = p_notif->p_aout;
1027     bool b_sleek;
1028     mtime_t last_time;
1029     HRESULT dsresult;
1030     long l_queued = 0;
1031
1032     /* We don't want any resampling when using S/PDIF output */
1033     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
1034
1035     /* Tell the main thread that we are ready */
1036     vlc_thread_ready( p_notif );
1037
1038     msg_Dbg( p_notif, "DirectSoundThread ready" );
1039
1040     /* Wait here until Play() is called */
1041     WaitForSingleObject( p_notif->event, INFINITE );
1042
1043     if( !p_notif->b_die )
1044     {
1045         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
1046
1047         /* start playing the buffer */
1048         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
1049                                         0,                         /* Unused */
1050                                         0,                         /* Unused */
1051                                         DSBPLAY_LOOPING );          /* Flags */
1052         if( dsresult == DSERR_BUFFERLOST )
1053         {
1054             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
1055             dsresult = IDirectSoundBuffer_Play(
1056                                             p_aout->output.p_sys->p_dsbuffer,
1057                                             0,                     /* Unused */
1058                                             0,                     /* Unused */
1059                                             DSBPLAY_LOOPING );      /* Flags */
1060         }
1061         if( dsresult != DS_OK )
1062         {
1063             msg_Err( p_aout, "cannot start playing buffer" );
1064         }
1065     }
1066     last_time = mdate();
1067
1068     while( !p_notif->b_die )
1069     {
1070         long l_read, l_free_slots;
1071         mtime_t mtime = mdate();
1072         int i;
1073
1074         /*
1075          * Fill in as much audio data as we can in our circular buffer
1076          */
1077
1078         /* Find out current play position */
1079         if FAILED( IDirectSoundBuffer_GetCurrentPosition(
1080                    p_aout->output.p_sys->p_dsbuffer, &l_read, NULL ) )
1081         {
1082             msg_Err( p_aout, "GetCurrentPosition() failed!" );
1083             l_read = 0;
1084         }
1085
1086         /* Detect underruns */
1087         if( l_queued && mtime - last_time >
1088             INT64_C(1000000) * l_queued / p_aout->output.output.i_rate )
1089         {
1090             msg_Dbg( p_aout, "detected underrun!" );
1091         }
1092         last_time = mtime;
1093
1094         /* Try to fill in as many frame buffers as possible */
1095         l_read /= p_aout->output.output.i_bytes_per_frame;
1096         l_queued = p_notif->i_write_slot * FRAME_SIZE - l_read;
1097         if( l_queued < 0 ) l_queued += (FRAME_SIZE * FRAMES_NUM);
1098         l_free_slots = (FRAMES_NUM * FRAME_SIZE - l_queued) / FRAME_SIZE;
1099
1100         for( i = 0; i < l_free_slots; i++ )
1101         {
1102             aout_buffer_t *p_buffer = aout_OutputNextBuffer( p_aout,
1103                 mtime + INT64_C(1000000) * (i * FRAME_SIZE + l_queued) /
1104                 p_aout->output.output.i_rate, b_sleek );
1105
1106             /* If there is no audio data available and we have some buffered
1107              * already, then just wait for the next time */
1108             if( !p_buffer && (i || l_queued / FRAME_SIZE) ) break;
1109
1110             if( FillBuffer( p_aout, p_notif->i_write_slot % FRAMES_NUM,
1111                             p_buffer ) != VLC_SUCCESS ) break;
1112         }
1113
1114         /* Sleep a reasonable amount of time */
1115         l_queued += (i * FRAME_SIZE);
1116         msleep( INT64_C(1000000) * l_queued / p_aout->output.output.i_rate / 2 );
1117     }
1118
1119     /* make sure the buffer isn't playing */
1120     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1121
1122     /* free the event */
1123     CloseHandle( p_notif->event );
1124
1125     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1126 }