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 VideoLAN (Centrale Réseaux) and its contributors
   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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <errno.h>                                                 /* ENOMEM */
  28 #include <fcntl.h>                                       /* open(), O_WRONLY */
  29 #include <string.h>                                            /* strerror() */
  30
  31 #include <stdlib.h>                            /* calloc(), malloc(), free() */
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc/aout.h>
  35 #include "aout_internal.h"
  36
  37 #include <windows.h>
  38 #include <mmsystem.h>
  39 #include <dsound.h>
  40
  41 #define FRAME_SIZE 2048              /* The size is in samples, not in bytes */
  42 #define FRAMES_NUM 8
  43
  44 /* frame buffer status */
  45 #define FRAME_QUEUED 0
  46 #define FRAME_EMPTY 1
  47
  48 /*****************************************************************************
  49  * DirectSound GUIDs.
  50  * Defining them here allows us to get rid of the dxguid library during
  51  * the linking stage.
  52  *****************************************************************************/
  53 #include <initguid.h>
  54 DEFINE_GUID(IID_IDirectSoundNotify, 0xb0210783, 0x89cd, 0x11d0, 0xaf, 0x8, 0x0, 0xa0, 0xc9, 0x25, 0xcd, 0x16);
  55
  56 /*****************************************************************************
  57  * Useful macros
  58  *****************************************************************************/
  59 #ifndef WAVE_FORMAT_IEEE_FLOAT
  60 #   define WAVE_FORMAT_IEEE_FLOAT 0x0003
  61 #endif
  62
  63 #ifndef WAVE_FORMAT_DOLBY_AC3_SPDIF
  64 #   define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
  65 #endif
  66
  67 #ifndef WAVE_FORMAT_EXTENSIBLE
  68 #define  WAVE_FORMAT_EXTENSIBLE   0xFFFE
  69 #endif
  70
  71 #ifndef SPEAKER_FRONT_LEFT
  72 #   define SPEAKER_FRONT_LEFT             0x1
  73 #   define SPEAKER_FRONT_RIGHT            0x2
  74 #   define SPEAKER_FRONT_CENTER           0x4
  75 #   define SPEAKER_LOW_FREQUENCY          0x8
  76 #   define SPEAKER_BACK_LEFT              0x10
  77 #   define SPEAKER_BACK_RIGHT             0x20
  78 #   define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
  79 #   define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
  80 #   define SPEAKER_BACK_CENTER            0x100
  81 #   define SPEAKER_SIDE_LEFT              0x200
  82 #   define SPEAKER_SIDE_RIGHT             0x400
  83 #   define SPEAKER_TOP_CENTER             0x800
  84 #   define SPEAKER_TOP_FRONT_LEFT         0x1000
  85 #   define SPEAKER_TOP_FRONT_CENTER       0x2000
  86 #   define SPEAKER_TOP_FRONT_RIGHT        0x4000
  87 #   define SPEAKER_TOP_BACK_LEFT          0x8000
  88 #   define SPEAKER_TOP_BACK_CENTER        0x10000
  89 #   define SPEAKER_TOP_BACK_RIGHT         0x20000
  90 #   define SPEAKER_RESERVED               0x80000000
  91 #endif
  92
  93 #ifndef DSSPEAKER_HEADPHONE
  94 #   define DSSPEAKER_HEADPHONE         0x00000001
  95 #endif
  96 #ifndef DSSPEAKER_MONO
  97 #   define DSSPEAKER_MONO              0x00000002
  98 #endif
  99 #ifndef DSSPEAKER_QUAD
 100 #   define DSSPEAKER_QUAD              0x00000003
 101 #endif
 102 #ifndef DSSPEAKER_STEREO
 103 #   define DSSPEAKER_STEREO            0x00000004
 104 #endif
 105 #ifndef DSSPEAKER_SURROUND
 106 #   define DSSPEAKER_SURROUND          0x00000005
 107 #endif
 108 #ifndef DSSPEAKER_5POINT1
 109 #   define DSSPEAKER_5POINT1           0x00000006
 110 #endif
 111
 112 #ifndef _WAVEFORMATEXTENSIBLE_
 113 typedef struct {
 114     WAVEFORMATEX    Format;
 115     union {
 116         WORD wValidBitsPerSample;       /* bits of precision  */
 117         WORD wSamplesPerBlock;          /* valid if wBitsPerSample==0 */
 118         WORD wReserved;                 /* If neither applies, set to zero. */
 119     } Samples;
 120     DWORD           dwChannelMask;      /* which channels are */
 121                                         /* present in stream  */
 122     GUID            SubFormat;
 123 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
 124 #endif
 125
 126 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, WAVE_FORMAT_IEEE_FLOAT, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 127 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_PCM, WAVE_FORMAT_PCM, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 128 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF, WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 129
 130 /*****************************************************************************
 131  * notification_thread_t: DirectX event thread
 132  *****************************************************************************/
 133 typedef struct notification_thread_t
 134 {
 135     VLC_COMMON_MEMBERS
 136
 137     aout_instance_t * p_aout;
 138     int i_frame_status[FRAMES_NUM];           /* status of each frame buffer */
 139     DSBPOSITIONNOTIFY p_events[FRAMES_NUM];      /* play notification events */
 140     int i_frame_size;                         /* Size in bytes of one frame */
 141
 142     mtime_t start_date;
 143
 144 } notification_thread_t;
 145
 146 /*****************************************************************************
 147  * aout_sys_t: directx audio output method descriptor
 148  *****************************************************************************
 149  * This structure is part of the audio output thread descriptor.
 150  * It describes the direct sound specific properties of an audio device.
 151  *****************************************************************************/
 152 struct aout_sys_t
 153 {
 154     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
 155
 156     int                 i_device_id;                 /*  user defined device */
 157     LPGUID              p_device_guid;
 158
 159     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
 160     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
 161                                        * takes care of mixing all the
 162                                        * secondary buffers into the primary) */
 163
 164     LPDIRECTSOUNDNOTIFY p_dsnotify;         /* the position notify interface */
 165     notification_thread_t *p_notif;                  /* DirectSoundThread id */
 166
 167     int b_playing;                                         /* playing status */
 168
 169     int i_frame_size;                         /* Size in bytes of one frame */
 170
 171     vlc_bool_t b_chan_reorder;              /* do we need channel reordering */
 172     int pi_chan_table[AOUT_CHAN_MAX];
 173     uint32_t i_channel_mask;
 174     uint32_t i_bits_per_sample;
 175     uint32_t i_channels;
 176 };
 177
 178 static const uint32_t pi_channels_src[] =
 179     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 180       AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
 181       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
 182       AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 };
 183 static const uint32_t pi_channels_in[] =
 184     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 185       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT,
 186       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 187       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY, 0 };
 188 static const uint32_t pi_channels_out[] =
 189     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 190       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY,
 191       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 192       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT, 0 };
 193
 194 /*****************************************************************************
 195  * Local prototypes.
 196  *****************************************************************************/
 197 static int  OpenAudio  ( vlc_object_t * );
 198 static void CloseAudio ( vlc_object_t * );
 199 static void Play       ( aout_instance_t * );
 200
 201 /* local functions */
 202 static void Probe             ( aout_instance_t * );
 203 static int  InitDirectSound   ( aout_instance_t * );
 204 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, vlc_bool_t );
 205 static int  CreateDSBufferPCM ( aout_instance_t *, int*, int, int, int, vlc_bool_t );
 206 static void DestroyDSBuffer   ( aout_instance_t * );
 207 static void DirectSoundThread ( notification_thread_t * );
 208 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 209
 210 /*****************************************************************************
 211  * Module descriptor
 212  *****************************************************************************/
 213 #define DEVICE_TEXT N_("Output device")
 214 #define DEVICE_LONGTEXT N_( \
 215     "DirectX device number: 0 default device, 1..N device by number" \
 216     "(Note that the default device appears as 0 AND another number)." )
 217 #define FLOAT_TEXT N_("Use float32 output")
 218 #define FLOAT_LONGTEXT N_( \
 219     "The option allows you to enable or disable the high-quality float32 " \
 220     "audio output mode (which is not well supported by some soundcards)." )
 221
 222 vlc_module_begin();
 223     set_description( _("DirectX audio output") );
 224     set_shortname( "DirectX" );
 225     set_capability( "audio output", 100 );
 226     set_category( CAT_AUDIO );
 227     set_subcategory( SUBCAT_AUDIO_AOUT );
 228     add_shortcut( "directx" );
 229     add_integer( "directx-audio-device", 0, NULL, DEVICE_TEXT,
 230                  DEVICE_LONGTEXT, VLC_TRUE );
 231     add_bool( "directx-audio-float32", 1, 0, FLOAT_TEXT,
 232               FLOAT_LONGTEXT, VLC_TRUE );
 233     set_callbacks( OpenAudio, CloseAudio );
 234 vlc_module_end();
 235
 236 /*****************************************************************************
 237  * OpenAudio: open the audio device
 238  *****************************************************************************
 239  * This function opens and setups Direct Sound.
 240  *****************************************************************************/
 241 static int OpenAudio( vlc_object_t *p_this )
 242 {
 243     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 244     vlc_value_t val;
 245     int i;
 246
 247     msg_Dbg( p_aout, "OpenAudio" );
 248
 249    /* Allocate structure */
 250     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 251     if( p_aout->output.p_sys == NULL )
 252     {
 253         msg_Err( p_aout, "out of memory" );
 254         return VLC_EGENERIC;
 255     }
 256
 257     /* Initialize some variables */
 258     p_aout->output.p_sys->p_dsobject = NULL;
 259     p_aout->output.p_sys->p_dsbuffer = NULL;
 260     p_aout->output.p_sys->p_dsnotify = NULL;
 261     p_aout->output.p_sys->p_notif = NULL;
 262     p_aout->output.p_sys->b_playing = 0;
 263
 264     p_aout->output.pf_play = Play;
 265     aout_VolumeSoftInit( p_aout );
 266
 267     /* Retrieve config values */
 268     var_Create( p_aout, "directx-audio-float32",
 269                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 270     var_Create( p_aout, "directx-audio-device",
 271                 VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
 272     var_Get( p_aout, "directx-audio-device", &val );
 273     p_aout->output.p_sys->i_device_id = val.i_int;
 274     p_aout->output.p_sys->p_device_guid = 0;
 275
 276     /* Initialise DirectSound */
 277     if( InitDirectSound( p_aout ) )
 278     {
 279         msg_Err( p_aout, "cannot initialize DirectSound" );
 280         goto error;
 281     }
 282
 283     if( var_Type( p_aout, "audio-device" ) == 0 )
 284     {
 285         Probe( p_aout );
 286     }
 287
 288     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 289     {
 290         /* Probe() has failed. */
 291         goto error;
 292     }
 293
 294     /* Now we need to setup our DirectSound play notification structure */
 295     p_aout->output.p_sys->p_notif =
 296         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 297     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 298
 299     /* Then create the notification events */
 300     for( i = 0; i < FRAMES_NUM; i++ )
 301         p_aout->output.p_sys->p_notif->p_events[i].hEventNotify =
 302             CreateEvent( NULL, FALSE, FALSE, NULL );
 303
 304     /* Open the device */
 305     if( val.i_int == AOUT_VAR_SPDIF )
 306     {
 307         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 308
 309         /* Calculate the frame size in bytes */
 310         p_aout->output.i_nb_samples = A52_FRAME_NB;
 311         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 312         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 313         p_aout->output.p_sys->i_frame_size =
 314             p_aout->output.output.i_bytes_per_frame;
 315
 316         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 317                             p_aout->output.output.i_physical_channels,
 318                             aout_FormatNbChannels( &p_aout->output.output ),
 319                             p_aout->output.output.i_rate,
 320                             p_aout->output.p_sys->i_frame_size, VLC_FALSE )
 321             != VLC_SUCCESS )
 322         {
 323             msg_Err( p_aout, "cannot open directx audio device" );
 324             free( p_aout->output.p_sys );
 325             return VLC_EGENERIC;
 326         }
 327
 328         aout_VolumeNoneInit( p_aout );
 329     }
 330     else
 331     {
 332         if( val.i_int == AOUT_VAR_5_1 )
 333         {
 334             p_aout->output.output.i_physical_channels
 335                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 336                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 337                    | AOUT_CHAN_LFE;
 338         }
 339         else if( val.i_int == AOUT_VAR_3F2R )
 340         {
 341             p_aout->output.output.i_physical_channels
 342                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 343                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 344         }
 345         else if( val.i_int == AOUT_VAR_2F2R )
 346         {
 347             p_aout->output.output.i_physical_channels
 348                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 349                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 350         }
 351         else if( val.i_int == AOUT_VAR_MONO )
 352         {
 353             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 354         }
 355         else
 356         {
 357             p_aout->output.output.i_physical_channels
 358                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 359         }
 360
 361         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 362                                p_aout->output.output.i_physical_channels,
 363                                aout_FormatNbChannels( &p_aout->output.output ),
 364                                p_aout->output.output.i_rate, VLC_FALSE )
 365             != VLC_SUCCESS )
 366         {
 367             msg_Err( p_aout, "cannot open directx audio device" );
 368             free( p_aout->output.p_sys );
 369             return VLC_EGENERIC;
 370         }
 371
 372         /* Calculate the frame size in bytes */
 373         p_aout->output.i_nb_samples = FRAME_SIZE;
 374         aout_FormatPrepare( &p_aout->output.output );
 375         p_aout->output.p_sys->i_frame_size =
 376             FRAME_SIZE * p_aout->output.output.i_bytes_per_frame;
 377
 378         aout_VolumeSoftInit( p_aout );
 379     }
 380
 381     /* then launch the notification thread */
 382     msg_Dbg( p_aout, "creating DirectSoundThread" );
 383     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 384                            "DirectSound Notification Thread",
 385                            DirectSoundThread,
 386                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
 387     {
 388         msg_Err( p_aout, "cannot create DirectSoundThread" );
 389         goto error;
 390     }
 391
 392     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 393
 394     return VLC_SUCCESS;
 395
 396  error:
 397     CloseAudio( VLC_OBJECT(p_aout) );
 398     return VLC_EGENERIC;
 399 }
 400
 401 /*****************************************************************************
 402  * Probe: probe the audio device for available formats and channels
 403  *****************************************************************************/
 404 static void Probe( aout_instance_t * p_aout )
 405 {
 406     vlc_value_t val, text;
 407     int i_format;
 408     unsigned int i_physical_channels;
 409     DWORD ui_speaker_config;
 410
 411     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 412     text.psz_string = _("Audio Device");
 413     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 414
 415     /* Test for 5.1 support */
 416     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 417                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 418                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 419     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 420     {
 421         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 422                                p_aout->output.output.i_rate, VLC_TRUE )
 423             == VLC_SUCCESS )
 424         {
 425             val.i_int = AOUT_VAR_5_1;
 426             text.psz_string = N_("5.1");
 427             var_Change( p_aout, "audio-device",
 428                         VLC_VAR_ADDCHOICE, &val, &text );
 429             msg_Dbg( p_aout, "device supports 5.1 channels" );
 430         }
 431     }
 432
 433     /* Test for 3 Front 2 Rear support */
 434     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 435                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 436                           AOUT_CHAN_REARRIGHT;
 437     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 438     {
 439         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 5,
 440                                p_aout->output.output.i_rate, VLC_TRUE )
 441             == VLC_SUCCESS )
 442         {
 443             val.i_int = AOUT_VAR_3F2R;
 444             text.psz_string = N_("3 Front 2 Rear");
 445             var_Change( p_aout, "audio-device",
 446                         VLC_VAR_ADDCHOICE, &val, &text );
 447             msg_Dbg( p_aout, "device supports 5 channels" );
 448         }
 449     }
 450
 451     /* Test for 2 Front 2 Rear support */
 452     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 453                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 454     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 455         == i_physical_channels )
 456     {
 457         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 458                                p_aout->output.output.i_rate, VLC_TRUE )
 459             == VLC_SUCCESS )
 460         {
 461             val.i_int = AOUT_VAR_2F2R;
 462             text.psz_string = N_("2 Front 2 Rear");
 463             var_Change( p_aout, "audio-device",
 464                         VLC_VAR_ADDCHOICE, &val, &text );
 465             msg_Dbg( p_aout, "device supports 4 channels" );
 466         }
 467     }
 468
 469     /* Test for stereo support */
 470     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 471     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 472                            p_aout->output.output.i_rate, VLC_TRUE )
 473         == VLC_SUCCESS )
 474     {
 475         val.i_int = AOUT_VAR_STEREO;
 476         text.psz_string = N_("Stereo");
 477         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 478         var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 479         msg_Dbg( p_aout, "device supports 2 channels" );
 480     }
 481
 482     /* Test for mono support */
 483     i_physical_channels = AOUT_CHAN_CENTER;
 484     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 485                            p_aout->output.output.i_rate, VLC_TRUE )
 486         == VLC_SUCCESS )
 487     {
 488         val.i_int = AOUT_VAR_MONO;
 489         text.psz_string = N_("Mono");
 490         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 491         msg_Dbg( p_aout, "device supports 1 channel" );
 492     }
 493
 494     /* Check the speaker configuration to determine which channel config should
 495      * be the default */
 496     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 497                                               &ui_speaker_config ) )
 498     {
 499         ui_speaker_config = DSSPEAKER_STEREO;
 500     }
 501     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 502     {
 503     case DSSPEAKER_5POINT1:
 504         val.i_int = AOUT_VAR_5_1;
 505         break;
 506     case DSSPEAKER_QUAD:
 507         val.i_int = AOUT_VAR_2F2R;
 508         break;
 509 #if 0 /* Lots of people just get their settings wrong and complain that
 510        * this is a problem with VLC so just don't ever set mono by default. */
 511     case DSSPEAKER_MONO:
 512         val.i_int = AOUT_VAR_MONO;
 513         break;
 514 #endif
 515     case DSSPEAKER_SURROUND:
 516     case DSSPEAKER_STEREO:
 517     default:
 518         val.i_int = AOUT_VAR_STEREO;
 519         break;
 520     }
 521     var_Set( p_aout, "audio-device", val );
 522
 523     /* Test for SPDIF support */
 524     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 525     {
 526         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 527                             p_aout->output.output.i_physical_channels,
 528                             aout_FormatNbChannels( &p_aout->output.output ),
 529                             p_aout->output.output.i_rate,
 530                             AOUT_SPDIF_SIZE, VLC_TRUE )
 531             == VLC_SUCCESS )
 532         {
 533             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 534             val.i_int = AOUT_VAR_SPDIF;
 535             text.psz_string = N_("A/52 over S/PDIF");
 536             var_Change( p_aout, "audio-device",
 537                         VLC_VAR_ADDCHOICE, &val, &text );
 538             if( config_GetInt( p_aout, "spdif" ) )
 539                 var_Set( p_aout, "audio-device", val );
 540         }
 541     }
 542
 543     var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
 544     if( val.i_int <= 0 )
 545     {
 546         /* Probe() has failed. */
 547         var_Destroy( p_aout, "audio-device" );
 548         return;
 549     }
 550
 551     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 552
 553     val.b_bool = VLC_TRUE;
 554     var_Set( p_aout, "intf-change", val );
 555 }
 556
 557 /*****************************************************************************
 558  * Play: we'll start playing the directsound buffer here because at least here
 559  *       we know the first buffer has been put in the aout fifo and we also
 560  *       know its date.
 561  *****************************************************************************/
 562 static void Play( aout_instance_t *p_aout )
 563 {
 564     if( !p_aout->output.p_sys->b_playing )
 565     {
 566         aout_buffer_t *p_buffer;
 567
 568         p_aout->output.p_sys->b_playing = 1;
 569
 570         /* get the playing date of the first aout buffer */
 571         p_aout->output.p_sys->p_notif->start_date =
 572             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 573
 574         /* fill in the first samples */
 575         p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 576         FillBuffer( p_aout, 0, p_buffer );
 577
 578         /* wake up the audio output thread */
 579         SetEvent( p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 580     }
 581 }
 582
 583 /*****************************************************************************
 584  * CloseAudio: close the audio device
 585  *****************************************************************************/
 586 static void CloseAudio( vlc_object_t *p_this )
 587 {
 588     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 589     aout_sys_t *p_sys = p_aout->output.p_sys;
 590
 591     msg_Dbg( p_aout, "CloseAudio" );
 592
 593     /* kill the position notification thread, if any */
 594     if( p_sys->p_notif )
 595     {
 596         vlc_object_detach( p_sys->p_notif );
 597         if( p_sys->p_notif->b_thread )
 598         {
 599             p_sys->p_notif->b_die = 1;
 600
 601             if( !p_sys->b_playing )
 602                 /* wake up the audio thread */
 603                 SetEvent( p_sys->p_notif->p_events[0].hEventNotify );
 604
 605             vlc_thread_join( p_sys->p_notif );
 606         }
 607         vlc_object_destroy( p_sys->p_notif );
 608     }
 609
 610     /* release the secondary buffer */
 611     DestroyDSBuffer( p_aout );
 612
 613     /* finally release the DirectSound object */
 614     if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
 615
 616     /* free DSOUND.DLL */
 617     if( p_sys->hdsound_dll ) FreeLibrary( p_sys->hdsound_dll );
 618
 619     if( p_aout->output.p_sys->p_device_guid )
 620         free( p_aout->output.p_sys->p_device_guid );
 621
 622     free( p_sys );
 623 }
 624
 625 /*****************************************************************************
 626  * CallBackDirectSoundEnum: callback to enumerate available devices
 627  *****************************************************************************/
 628 static int CALLBACK CallBackDirectSoundEnum( LPGUID p_guid, LPCSTR psz_desc,
 629                                              LPCSTR psz_mod, LPVOID _p_aout )
 630 {
 631     aout_instance_t *p_aout = (aout_instance_t *)_p_aout;
 632
 633     msg_Dbg( p_aout, "found device: %s", psz_desc );
 634
 635     if( p_aout->output.p_sys->i_device_id == 0 && p_guid )
 636     {
 637         p_aout->output.p_sys->p_device_guid = malloc( sizeof( GUID ) );
 638         *p_aout->output.p_sys->p_device_guid = *p_guid;
 639         msg_Dbg( p_aout, "using device: %s", psz_desc );
 640     }
 641
 642     p_aout->output.p_sys->i_device_id--;
 643     return 1;
 644 }
 645
 646 /*****************************************************************************
 647  * InitDirectSound: handle all the gory details of DirectSound initialisation
 648  *****************************************************************************/
 649 static int InitDirectSound( aout_instance_t *p_aout )
 650 {
 651     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 652     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACK, LPVOID);
 653
 654     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 655     if( p_aout->output.p_sys->hdsound_dll == NULL )
 656     {
 657         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 658         goto error;
 659     }
 660
 661     OurDirectSoundCreate = (void *)
 662         GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 663                         "DirectSoundCreate" );
 664     if( OurDirectSoundCreate == NULL )
 665     {
 666         msg_Warn( p_aout, "GetProcAddress FAILED" );
 667         goto error;
 668     }
 669
 670     /* Get DirectSoundEnumerate */
 671     OurDirectSoundEnumerate = (void *)
 672        GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 673                        "DirectSoundEnumerateA" );
 674     if( OurDirectSoundEnumerate )
 675     {
 676         /* Attempt enumeration */
 677         if( FAILED( OurDirectSoundEnumerate( CallBackDirectSoundEnum,
 678                                              p_aout ) ) )
 679         {
 680             msg_Dbg( p_aout, "enumeration of DirectSound devices failed" );
 681         }
 682     }
 683
 684     /* Create the direct sound object */
 685     if FAILED( OurDirectSoundCreate( p_aout->output.p_sys->p_device_guid,
 686                                      &p_aout->output.p_sys->p_dsobject,
 687                                      NULL ) )
 688     {
 689         msg_Warn( p_aout, "cannot create a direct sound device" );
 690         goto error;
 691     }
 692
 693     /* Set DirectSound Cooperative level, ie what control we want over Windows
 694      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 695      * settings of the primary buffer, but also that only the sound of our
 696      * application will be hearable when it will have the focus.
 697      * !!! (this is not really working as intended yet because to set the
 698      * cooperative level you need the window handle of your application, and
 699      * I don't know of any easy way to get it. Especially since we might play
 700      * sound without any video, and so what window handle should we use ???
 701      * The hack for now is to use the Desktop window handle - it seems to be
 702      * working */
 703     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 704                                           GetDesktopWindow(),
 705                                           DSSCL_EXCLUSIVE) )
 706     {
 707         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 708     }
 709
 710     return VLC_SUCCESS;
 711
 712  error:
 713     p_aout->output.p_sys->p_dsobject = NULL;
 714     if( p_aout->output.p_sys->hdsound_dll )
 715     {
 716         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 717         p_aout->output.p_sys->hdsound_dll = NULL;
 718     }
 719     return VLC_EGENERIC;
 720
 721 }
 722
 723 /*****************************************************************************
 724  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 725  *****************************************************************************
 726  * This function creates the buffer we'll use to play audio.
 727  * In DirectSound there are two kinds of buffers:
 728  * - the primary buffer: which is the actual buffer that the soundcard plays
 729  * - the secondary buffer(s): these buffers are the one actually used by
 730  *    applications and DirectSound takes care of mixing them into the primary.
 731  *
 732  * Once you create a secondary buffer, you cannot change its format anymore so
 733  * you have to release the current one and create another.
 734  *****************************************************************************/
 735 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 736                            int i_channels, int i_nb_channels, int i_rate,
 737                            int i_bytes_per_frame, vlc_bool_t b_probe )
 738 {
 739     WAVEFORMATEXTENSIBLE waveformat;
 740     DSBUFFERDESC         dsbdesc;
 741     unsigned int         i;
 742
 743     /* First set the sound buffer format */
 744     waveformat.dwChannelMask = 0;
 745     for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
 746     {
 747         if( i_channels & pi_channels_src[i] )
 748             waveformat.dwChannelMask |= pi_channels_in[i];
 749     }
 750
 751     switch( i_format )
 752     {
 753     case VLC_FOURCC('s','p','d','i'):
 754         i_nb_channels = 2;
 755         /* To prevent channel re-ordering */
 756         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 757         waveformat.Format.wBitsPerSample = 16;
 758         waveformat.Samples.wValidBitsPerSample =
 759             waveformat.Format.wBitsPerSample;
 760         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 761         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 762         break;
 763
 764     case VLC_FOURCC('f','l','3','2'):
 765         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 766         waveformat.Samples.wValidBitsPerSample =
 767             waveformat.Format.wBitsPerSample;
 768         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 769         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 770         break;
 771
 772     case VLC_FOURCC('s','1','6','l'):
 773         waveformat.Format.wBitsPerSample = 16;
 774         waveformat.Samples.wValidBitsPerSample =
 775             waveformat.Format.wBitsPerSample;
 776         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 777         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 778         break;
 779     }
 780
 781     waveformat.Format.nChannels = i_nb_channels;
 782     waveformat.Format.nSamplesPerSec = i_rate;
 783     waveformat.Format.nBlockAlign =
 784         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 785     waveformat.Format.nAvgBytesPerSec =
 786         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 787
 788     p_aout->output.p_sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
 789     p_aout->output.p_sys->i_channels = i_nb_channels;
 790
 791     /* Then fill in the direct sound descriptor */
 792     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 793     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 794     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 795                     | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
 796                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 797
 798     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 799     if( i_nb_channels <= 2 )
 800     {
 801         waveformat.Format.cbSize = 0;
 802     }
 803     else
 804     {
 805         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 806         waveformat.Format.cbSize =
 807             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 808
 809         /* Needed for 5.1 on emu101k */
 810         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 811     }
 812
 813     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 814     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 815
 816     if FAILED( IDirectSound_CreateSoundBuffer(
 817                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 818                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 819     {
 820         if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
 821         {
 822             /* Try without DSBCAPS_LOCHARDWARE */
 823             dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 824             if FAILED( IDirectSound_CreateSoundBuffer(
 825                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 826                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 827             {
 828                 return VLC_EGENERIC;
 829             }
 830             if( !b_probe )
 831                 msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
 832         }
 833         else
 834         {
 835             return VLC_EGENERIC;
 836         }
 837     }
 838
 839     /* Stop here if we were just probing */
 840     if( b_probe )
 841     {
 842         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 843         p_aout->output.p_sys->p_dsbuffer = NULL;
 844         return VLC_SUCCESS;
 845     }
 846
 847     /* Backup the size of a frame */
 848     p_aout->output.p_sys->p_notif->i_frame_size = i_bytes_per_frame;
 849
 850     /* Now the secondary buffer is created, we need to setup its position
 851      * notification */
 852     for( i = 0; i < FRAMES_NUM; i++ )
 853     {
 854         p_aout->output.p_sys->p_notif->p_events[i].dwOffset = i *
 855             p_aout->output.p_sys->p_notif->i_frame_size;
 856
 857         p_aout->output.p_sys->p_notif->i_frame_status[i] = FRAME_EMPTY;
 858     }
 859
 860     /* Get the IDirectSoundNotify interface */
 861     if FAILED( IDirectSoundBuffer_QueryInterface(
 862                                 p_aout->output.p_sys->p_dsbuffer,
 863                                 &IID_IDirectSoundNotify,
 864                                 (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
 865     {
 866         msg_Err( p_aout, "cannot get IDirectSoundNotify interface" );
 867         goto error;
 868     }
 869
 870     if FAILED( IDirectSoundNotify_SetNotificationPositions(
 871                                     p_aout->output.p_sys->p_dsnotify,
 872                                     FRAMES_NUM,
 873                                     p_aout->output.p_sys->p_notif->p_events ) )
 874     {
 875         msg_Err( p_aout, "cannot set position notification" );
 876         goto error;
 877     }
 878
 879     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 880
 881     p_aout->output.p_sys->b_chan_reorder =
 882         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
 883                                   waveformat.dwChannelMask, i_nb_channels,
 884                                   p_aout->output.p_sys->pi_chan_table );
 885
 886     if( p_aout->output.p_sys->b_chan_reorder )
 887     {
 888         msg_Dbg( p_aout, "channel reordering needed" );
 889     }
 890
 891     return VLC_SUCCESS;
 892
 893  error:
 894     DestroyDSBuffer( p_aout );
 895     return VLC_EGENERIC;
 896 }
 897
 898 /*****************************************************************************
 899  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 900  *****************************************************************************
 901  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 902  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 903  ****************************************************************************/
 904 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 905                               int i_channels, int i_nb_channels, int i_rate,
 906                               vlc_bool_t b_probe )
 907 {
 908     vlc_value_t val;
 909
 910     var_Get( p_aout, "directx-audio-float32", &val );
 911
 912     /* Float32 audio samples are not supported for 5.1 output on the emu101k */
 913
 914     if( !val.b_bool || i_nb_channels > 2 ||
 915         CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
 916                         i_channels, i_nb_channels, i_rate,
 917                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 918         != VLC_SUCCESS )
 919     {
 920         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
 921                              i_channels, i_nb_channels, i_rate,
 922                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 923              != VLC_SUCCESS )
 924         {
 925             return VLC_EGENERIC;
 926         }
 927         else
 928         {
 929             *i_format = VLC_FOURCC('s','1','6','l');
 930             return VLC_SUCCESS;
 931         }
 932     }
 933     else
 934     {
 935         *i_format = VLC_FOURCC('f','l','3','2');
 936         return VLC_SUCCESS;
 937     }
 938 }
 939
 940 /*****************************************************************************
 941  * DestroyDSBuffer
 942  *****************************************************************************
 943  * This function destroys the secondary buffer.
 944  *****************************************************************************/
 945 static void DestroyDSBuffer( aout_instance_t *p_aout )
 946 {
 947     if( p_aout->output.p_sys->p_dsnotify )
 948     {
 949         IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
 950         p_aout->output.p_sys->p_dsnotify = NULL;
 951     }
 952
 953     if( p_aout->output.p_sys->p_dsbuffer )
 954     {
 955         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 956         p_aout->output.p_sys->p_dsbuffer = NULL;
 957     }
 958 }
 959
 960 /*****************************************************************************
 961  * FillBuffer: Fill in one of the direct sound frame buffers.
 962  *****************************************************************************
 963  * Returns VLC_SUCCESS on success.
 964  *****************************************************************************/
 965 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 966                        aout_buffer_t *p_buffer )
 967 {
 968     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 969     aout_sys_t *p_sys = p_aout->output.p_sys;
 970     void *p_write_position, *p_wrap_around;
 971     long l_bytes1, l_bytes2;
 972     HRESULT dsresult;
 973
 974     /* Before copying anything, we have to lock the buffer */
 975     dsresult = IDirectSoundBuffer_Lock(
 976                 p_sys->p_dsbuffer,                              /* DS buffer */
 977                 i_frame * p_notif->i_frame_size,             /* Start offset */
 978                 p_notif->i_frame_size,                    /* Number of bytes */
 979                 &p_write_position,                  /* Address of lock start */
 980                 &l_bytes1,       /* Count of bytes locked before wrap around */
 981                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 982                 &l_bytes2,               /* Count of bytes after wrap around */
 983                 0 );                                                /* Flags */
 984     if( dsresult == DSERR_BUFFERLOST )
 985     {
 986         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
 987         dsresult = IDirectSoundBuffer_Lock(
 988                                p_sys->p_dsbuffer,
 989                                i_frame * p_notif->i_frame_size,
 990                                p_notif->i_frame_size,
 991                                &p_write_position,
 992                                &l_bytes1,
 993                                &p_wrap_around,
 994                                &l_bytes2,
 995                                0 );
 996     }
 997     if( dsresult != DS_OK )
 998     {
 999         msg_Warn( p_notif, "cannot lock buffer" );
1000         if( p_buffer ) aout_BufferFree( p_buffer );
1001         return VLC_EGENERIC;
1002     }
1003
1004     if( p_buffer == NULL )
1005     {
1006         memset( p_write_position, 0, l_bytes1 );
1007     }
1008     else
1009     {
1010         if( p_sys->b_chan_reorder )
1011         {
1012             /* Do the channel reordering here */
1013             aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_nb_bytes,
1014                                  p_sys->i_channels, p_sys->pi_chan_table,
1015                                  p_sys->i_bits_per_sample );
1016         }
1017
1018         p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
1019                                   l_bytes1 );
1020         aout_BufferFree( p_buffer );
1021     }
1022
1023     /* Now the data has been copied, unlock the buffer */
1024     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
1025                                p_wrap_around, l_bytes2 );
1026
1027     return VLC_SUCCESS;
1028 }
1029
1030 /*****************************************************************************
1031  * DirectSoundThread: this thread will capture play notification events.
1032  *****************************************************************************
1033  * We use this thread to emulate a callback mechanism. The thread probes for
1034  * event notification and fills up the DS secondary buffer when needed.
1035  *****************************************************************************/
1036 static void DirectSoundThread( notification_thread_t *p_notif )
1037 {
1038     HANDLE  notification_events[FRAMES_NUM];
1039     HRESULT dsresult;
1040     aout_instance_t *p_aout = p_notif->p_aout;
1041     int i, i_which_frame, i_last_frame, i_next_frame;
1042     mtime_t mtime;
1043     vlc_bool_t b_sleek;
1044
1045     for( i = 0; i < FRAMES_NUM; i++ )
1046         notification_events[i] = p_notif->p_events[i].hEventNotify;
1047
1048     /* We don't want any resampling when using S/PDIF output */
1049     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
1050
1051     /* Tell the main thread that we are ready */
1052     vlc_thread_ready( p_notif );
1053
1054     msg_Dbg( p_notif, "DirectSoundThread ready" );
1055
1056     /* Wait here until Play() is called */
1057     WaitForSingleObject( notification_events[0], INFINITE );
1058
1059     if( !p_notif->b_die )
1060     {
1061         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
1062
1063         /* start playing the buffer */
1064         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
1065                                         0,                         /* Unused */
1066                                         0,                         /* Unused */
1067                                         DSBPLAY_LOOPING );          /* Flags */
1068         if( dsresult == DSERR_BUFFERLOST )
1069         {
1070             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
1071             dsresult = IDirectSoundBuffer_Play(
1072                                             p_aout->output.p_sys->p_dsbuffer,
1073                                             0,                     /* Unused */
1074                                             0,                     /* Unused */
1075                                             DSBPLAY_LOOPING );      /* Flags */
1076         }
1077         if( dsresult != DS_OK )
1078         {
1079             msg_Err( p_aout, "cannot start playing buffer" );
1080         }
1081     }
1082
1083     while( !p_notif->b_die )
1084     {
1085         aout_buffer_t *p_buffer;
1086         long l_latency;
1087
1088         /* wait for the position notification */
1089         i_which_frame = WaitForMultipleObjects( FRAMES_NUM,
1090                                                 notification_events, 0,
1091                                                 INFINITE ) - WAIT_OBJECT_0;
1092
1093         if( p_notif->b_die )
1094             break;
1095
1096         mtime = mdate();
1097
1098         /* We take into account the current latency */
1099         if SUCCEEDED( IDirectSoundBuffer_GetCurrentPosition(
1100                         p_aout->output.p_sys->p_dsbuffer,
1101                         &l_latency, NULL ) )
1102         {
1103             if( l_latency > (i_which_frame * FRAME_SIZE)
1104                   && l_latency < ((i_which_frame+1) * FRAME_SIZE) )
1105             {
1106                 l_latency = - ( l_latency /
1107                                 p_aout->output.output.i_bytes_per_frame %
1108                                 FRAME_SIZE );
1109             }
1110             else
1111             {
1112                 l_latency = FRAME_SIZE - ( l_latency /
1113                                       p_aout->output.output.i_bytes_per_frame %
1114                                       FRAME_SIZE );
1115             }
1116         }
1117         else
1118         {
1119             l_latency = 0;
1120         }
1121
1122         /* Mark last frame as empty */
1123         i_last_frame = (i_which_frame + FRAMES_NUM -1) % FRAMES_NUM;
1124         i_next_frame = (i_which_frame + 1) % FRAMES_NUM;
1125         p_notif->i_frame_status[i_last_frame] = FRAME_EMPTY;
1126
1127         /* Try to fill in as many frame buffers as possible */
1128         for( i = i_next_frame; (i % FRAMES_NUM) != i_which_frame; i++ )
1129         {
1130
1131             /* Check if frame buf is already filled */
1132             if( p_notif->i_frame_status[i % FRAMES_NUM] == FRAME_QUEUED )
1133                 continue;
1134
1135             p_buffer = aout_OutputNextBuffer( p_aout,
1136                 mtime + 1000000 / p_aout->output.output.i_rate *
1137                 ((i - i_next_frame + 1) * FRAME_SIZE + l_latency), b_sleek );
1138
1139             /* If there is no audio data available and we have some buffered
1140              * already, then just wait for the next time */
1141             if( !p_buffer && (i != i_next_frame) )
1142             {
1143                 //msg_Err( p_aout, "only %i frame buffers filled!",
1144                 //         i - i_next_frame );
1145                 break;
1146             }
1147
1148             if( FillBuffer( p_aout, (i%FRAMES_NUM), p_buffer )
1149                 != VLC_SUCCESS )
1150                 break;
1151
1152             /* Mark the frame buffer as QUEUED */
1153             p_notif->i_frame_status[i%FRAMES_NUM] = FRAME_QUEUED;
1154         }
1155
1156     }
1157
1158     /* make sure the buffer isn't playing */
1159     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1160
1161     /* free the events */
1162     for( i = 0; i < FRAMES_NUM; i++ )
1163         CloseHandle( notification_events[i] );
1164
1165     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1166 }