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 #include <string.h>                                            /* strerror() */
  28
  29 #include <stdlib.h>                            /* calloc(), malloc(), free() */
  30
  31 #include <vlc/vlc.h>
  32 #include <vlc/aout.h>
  33 #include "aout_internal.h"
  34
  35 #include <windows.h>
  36 #include <mmsystem.h>
  37 #include <dsound.h>
  38
  39 #define FRAME_SIZE ((int)p_aout->output.output.i_rate/20) /* Size in samples */
  40 #define FRAMES_NUM 8                                      /* Needs to be > 3 */
  41
  42 /*****************************************************************************
  43  * DirectSound GUIDs.
  44  * Defining them here allows us to get rid of the dxguid library during
  45  * the linking stage.
  46  *****************************************************************************/
  47 #include <initguid.h>
  48
  49 /*****************************************************************************
  50  * Useful macros
  51  *****************************************************************************/
  52 #ifndef WAVE_FORMAT_IEEE_FLOAT
  53 #   define WAVE_FORMAT_IEEE_FLOAT 0x0003
  54 #endif
  55
  56 #ifndef WAVE_FORMAT_DOLBY_AC3_SPDIF
  57 #   define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
  58 #endif
  59
  60 #ifndef WAVE_FORMAT_EXTENSIBLE
  61 #define  WAVE_FORMAT_EXTENSIBLE   0xFFFE
  62 #endif
  63
  64 #ifndef SPEAKER_FRONT_LEFT
  65 #   define SPEAKER_FRONT_LEFT             0x1
  66 #   define SPEAKER_FRONT_RIGHT            0x2
  67 #   define SPEAKER_FRONT_CENTER           0x4
  68 #   define SPEAKER_LOW_FREQUENCY          0x8
  69 #   define SPEAKER_BACK_LEFT              0x10
  70 #   define SPEAKER_BACK_RIGHT             0x20
  71 #   define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
  72 #   define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
  73 #   define SPEAKER_BACK_CENTER            0x100
  74 #   define SPEAKER_SIDE_LEFT              0x200
  75 #   define SPEAKER_SIDE_RIGHT             0x400
  76 #   define SPEAKER_TOP_CENTER             0x800
  77 #   define SPEAKER_TOP_FRONT_LEFT         0x1000
  78 #   define SPEAKER_TOP_FRONT_CENTER       0x2000
  79 #   define SPEAKER_TOP_FRONT_RIGHT        0x4000
  80 #   define SPEAKER_TOP_BACK_LEFT          0x8000
  81 #   define SPEAKER_TOP_BACK_CENTER        0x10000
  82 #   define SPEAKER_TOP_BACK_RIGHT         0x20000
  83 #   define SPEAKER_RESERVED               0x80000000
  84 #endif
  85
  86 #ifndef DSSPEAKER_HEADPHONE
  87 #   define DSSPEAKER_HEADPHONE         0x00000001
  88 #endif
  89 #ifndef DSSPEAKER_MONO
  90 #   define DSSPEAKER_MONO              0x00000002
  91 #endif
  92 #ifndef DSSPEAKER_QUAD
  93 #   define DSSPEAKER_QUAD              0x00000003
  94 #endif
  95 #ifndef DSSPEAKER_STEREO
  96 #   define DSSPEAKER_STEREO            0x00000004
  97 #endif
  98 #ifndef DSSPEAKER_SURROUND
  99 #   define DSSPEAKER_SURROUND          0x00000005
 100 #endif
 101 #ifndef DSSPEAKER_5POINT1
 102 #   define DSSPEAKER_5POINT1           0x00000006
 103 #endif
 104
 105 #ifndef _WAVEFORMATEXTENSIBLE_
 106 typedef struct {
 107     WAVEFORMATEX    Format;
 108     union {
 109         WORD wValidBitsPerSample;       /* bits of precision  */
 110         WORD wSamplesPerBlock;          /* valid if wBitsPerSample==0 */
 111         WORD wReserved;                 /* If neither applies, set to zero. */
 112     } Samples;
 113     DWORD           dwChannelMask;      /* which channels are */
 114                                         /* present in stream  */
 115     GUID            SubFormat;
 116 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
 117 #endif
 118
 119 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, WAVE_FORMAT_IEEE_FLOAT, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 120 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_PCM, WAVE_FORMAT_PCM, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 121 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF, WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 122
 123 /*****************************************************************************
 124  * notification_thread_t: DirectX event thread
 125  *****************************************************************************/
 126 typedef struct notification_thread_t
 127 {
 128     VLC_COMMON_MEMBERS
 129
 130     aout_instance_t *p_aout;
 131     int i_frame_size;                          /* size in bytes of one frame */
 132     int i_write_slot;       /* current write position in our circular buffer */
 133
 134     mtime_t start_date;
 135     HANDLE event;
 136
 137 } notification_thread_t;
 138
 139 /*****************************************************************************
 140  * aout_sys_t: directx audio output method descriptor
 141  *****************************************************************************
 142  * This structure is part of the audio output thread descriptor.
 143  * It describes the direct sound specific properties of an audio device.
 144  *****************************************************************************/
 145 struct aout_sys_t
 146 {
 147     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
 148
 149     int                 i_device_id;                 /*  user defined device */
 150     LPGUID              p_device_guid;
 151
 152     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
 153     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
 154                                        * takes care of mixing all the
 155                                        * secondary buffers into the primary) */
 156
 157     notification_thread_t *p_notif;                  /* DirectSoundThread id */
 158
 159     int b_playing;                                         /* playing status */
 160
 161     int i_frame_size;                         /* Size in bytes of one frame */
 162
 163     vlc_bool_t b_chan_reorder;              /* do we need channel reordering */
 164     int pi_chan_table[AOUT_CHAN_MAX];
 165     uint32_t i_channel_mask;
 166     uint32_t i_bits_per_sample;
 167     uint32_t i_channels;
 168 };
 169
 170 static const uint32_t pi_channels_src[] =
 171     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 172       AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
 173       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
 174       AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 };
 175 static const uint32_t pi_channels_in[] =
 176     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 177       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT,
 178       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 179       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY, 0 };
 180 static const uint32_t pi_channels_out[] =
 181     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 182       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY,
 183       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 184       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT, 0 };
 185
 186 /*****************************************************************************
 187  * Local prototypes.
 188  *****************************************************************************/
 189 static int  OpenAudio  ( vlc_object_t * );
 190 static void CloseAudio ( vlc_object_t * );
 191 static void Play       ( aout_instance_t * );
 192
 193 /* local functions */
 194 static void Probe             ( aout_instance_t * );
 195 static int  InitDirectSound   ( aout_instance_t * );
 196 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, vlc_bool_t );
 197 static int  CreateDSBufferPCM ( aout_instance_t *, int*, int, int, int, vlc_bool_t );
 198 static void DestroyDSBuffer   ( aout_instance_t * );
 199 static void DirectSoundThread ( notification_thread_t * );
 200 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 201
 202 /*****************************************************************************
 203  * Module descriptor
 204  *****************************************************************************/
 205 #define DEVICE_TEXT N_("Output device")
 206 #define DEVICE_LONGTEXT N_( \
 207     "DirectX device number: 0 default device, 1..N device by number" \
 208     "(Note that the default device appears as 0 AND another number)." )
 209 #define FLOAT_TEXT N_("Use float32 output")
 210 #define FLOAT_LONGTEXT N_( \
 211     "The option allows you to enable or disable the high-quality float32 " \
 212     "audio output mode (which is not well supported by some soundcards)." )
 213
 214 vlc_module_begin();
 215     set_description( _("DirectX audio output") );
 216     set_shortname( "DirectX" );
 217     set_capability( "audio output", 100 );
 218     set_category( CAT_AUDIO );
 219     set_subcategory( SUBCAT_AUDIO_AOUT );
 220     add_shortcut( "directx" );
 221     add_integer( "directx-audio-device", 0, NULL, DEVICE_TEXT,
 222                  DEVICE_LONGTEXT, VLC_TRUE );
 223     add_bool( "directx-audio-float32", 0, 0, FLOAT_TEXT,
 224               FLOAT_LONGTEXT, VLC_TRUE );
 225     set_callbacks( OpenAudio, CloseAudio );
 226 vlc_module_end();
 227
 228 /*****************************************************************************
 229  * OpenAudio: open the audio device
 230  *****************************************************************************
 231  * This function opens and setups Direct Sound.
 232  *****************************************************************************/
 233 static int OpenAudio( vlc_object_t *p_this )
 234 {
 235     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 236     vlc_value_t val;
 237
 238     msg_Dbg( p_aout, "OpenAudio" );
 239
 240    /* Allocate structure */
 241     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 242     if( p_aout->output.p_sys == NULL )
 243     {
 244         msg_Err( p_aout, "out of memory" );
 245         return VLC_EGENERIC;
 246     }
 247
 248     /* Initialize some variables */
 249     p_aout->output.p_sys->p_dsobject = NULL;
 250     p_aout->output.p_sys->p_dsbuffer = NULL;
 251     p_aout->output.p_sys->p_notif = NULL;
 252     p_aout->output.p_sys->b_playing = 0;
 253
 254     p_aout->output.pf_play = Play;
 255     aout_VolumeSoftInit( p_aout );
 256
 257     /* Retrieve config values */
 258     var_Create( p_aout, "directx-audio-float32",
 259                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 260     var_Create( p_aout, "directx-audio-device",
 261                 VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
 262     var_Get( p_aout, "directx-audio-device", &val );
 263     p_aout->output.p_sys->i_device_id = val.i_int;
 264     p_aout->output.p_sys->p_device_guid = 0;
 265
 266     /* Initialise DirectSound */
 267     if( InitDirectSound( p_aout ) )
 268     {
 269         msg_Err( p_aout, "cannot initialize DirectSound" );
 270         goto error;
 271     }
 272
 273     if( var_Type( p_aout, "audio-device" ) == 0 )
 274     {
 275         Probe( p_aout );
 276     }
 277
 278     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 279     {
 280         /* Probe() has failed. */
 281         goto error;
 282     }
 283
 284     /* Open the device */
 285     if( val.i_int == AOUT_VAR_SPDIF )
 286     {
 287         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 288
 289         /* Calculate the frame size in bytes */
 290         p_aout->output.i_nb_samples = A52_FRAME_NB;
 291         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 292         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 293         p_aout->output.p_sys->i_frame_size =
 294             p_aout->output.output.i_bytes_per_frame;
 295
 296         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 297                             p_aout->output.output.i_physical_channels,
 298                             aout_FormatNbChannels( &p_aout->output.output ),
 299                             p_aout->output.output.i_rate,
 300                             p_aout->output.p_sys->i_frame_size, VLC_FALSE )
 301             != VLC_SUCCESS )
 302         {
 303             msg_Err( p_aout, "cannot open directx audio device" );
 304             free( p_aout->output.p_sys );
 305             return VLC_EGENERIC;
 306         }
 307
 308         aout_VolumeNoneInit( p_aout );
 309     }
 310     else
 311     {
 312         if( val.i_int == AOUT_VAR_5_1 )
 313         {
 314             p_aout->output.output.i_physical_channels
 315                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 316                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 317                    | AOUT_CHAN_LFE;
 318         }
 319         else if( val.i_int == AOUT_VAR_3F2R )
 320         {
 321             p_aout->output.output.i_physical_channels
 322                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 323                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 324         }
 325         else if( val.i_int == AOUT_VAR_2F2R )
 326         {
 327             p_aout->output.output.i_physical_channels
 328                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 329                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 330         }
 331         else if( val.i_int == AOUT_VAR_MONO )
 332         {
 333             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 334         }
 335         else
 336         {
 337             p_aout->output.output.i_physical_channels
 338                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 339         }
 340
 341         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 342                                p_aout->output.output.i_physical_channels,
 343                                aout_FormatNbChannels( &p_aout->output.output ),
 344                                p_aout->output.output.i_rate, VLC_FALSE )
 345             != VLC_SUCCESS )
 346         {
 347             msg_Err( p_aout, "cannot open directx audio device" );
 348             free( p_aout->output.p_sys );
 349             return VLC_EGENERIC;
 350         }
 351
 352         /* Calculate the frame size in bytes */
 353         p_aout->output.i_nb_samples = FRAME_SIZE;
 354         aout_FormatPrepare( &p_aout->output.output );
 355         aout_VolumeSoftInit( p_aout );
 356     }
 357
 358     /* Now we need to setup our DirectSound play notification structure */
 359     p_aout->output.p_sys->p_notif =
 360         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 361     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 362
 363     p_aout->output.p_sys->p_notif->event = CreateEvent( 0, FALSE, FALSE, 0 );
 364     p_aout->output.p_sys->p_notif->i_frame_size =
 365         p_aout->output.p_sys->i_frame_size;
 366
 367     /* then launch the notification thread */
 368     msg_Dbg( p_aout, "creating DirectSoundThread" );
 369     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 370                            "DirectSound Notification Thread",
 371                            DirectSoundThread,
 372                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
 373     {
 374         msg_Err( p_aout, "cannot create DirectSoundThread" );
 375         CloseHandle( p_aout->output.p_sys->p_notif->event );
 376         vlc_object_destroy( p_aout->output.p_sys->p_notif );
 377         p_aout->output.p_sys->p_notif = 0;
 378         goto error;
 379     }
 380
 381     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 382
 383     return VLC_SUCCESS;
 384
 385  error:
 386     CloseAudio( VLC_OBJECT(p_aout) );
 387     return VLC_EGENERIC;
 388 }
 389
 390 /*****************************************************************************
 391  * Probe: probe the audio device for available formats and channels
 392  *****************************************************************************/
 393 static void Probe( aout_instance_t * p_aout )
 394 {
 395     vlc_value_t val, text;
 396     int i_format;
 397     unsigned int i_physical_channels;
 398     DWORD ui_speaker_config;
 399
 400     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 401     text.psz_string = _("Audio Device");
 402     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 403
 404     /* Test for 5.1 support */
 405     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 406                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 407                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 408     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 409     {
 410         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 411                                p_aout->output.output.i_rate, VLC_TRUE )
 412             == VLC_SUCCESS )
 413         {
 414             val.i_int = AOUT_VAR_5_1;
 415             text.psz_string = N_("5.1");
 416             var_Change( p_aout, "audio-device",
 417                         VLC_VAR_ADDCHOICE, &val, &text );
 418             msg_Dbg( p_aout, "device supports 5.1 channels" );
 419         }
 420     }
 421
 422     /* Test for 3 Front 2 Rear support */
 423     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 424                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 425                           AOUT_CHAN_REARRIGHT;
 426     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 427     {
 428         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 5,
 429                                p_aout->output.output.i_rate, VLC_TRUE )
 430             == VLC_SUCCESS )
 431         {
 432             val.i_int = AOUT_VAR_3F2R;
 433             text.psz_string = N_("3 Front 2 Rear");
 434             var_Change( p_aout, "audio-device",
 435                         VLC_VAR_ADDCHOICE, &val, &text );
 436             msg_Dbg( p_aout, "device supports 5 channels" );
 437         }
 438     }
 439
 440     /* Test for 2 Front 2 Rear support */
 441     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 442                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 443     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 444         == i_physical_channels )
 445     {
 446         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 447                                p_aout->output.output.i_rate, VLC_TRUE )
 448             == VLC_SUCCESS )
 449         {
 450             val.i_int = AOUT_VAR_2F2R;
 451             text.psz_string = N_("2 Front 2 Rear");
 452             var_Change( p_aout, "audio-device",
 453                         VLC_VAR_ADDCHOICE, &val, &text );
 454             msg_Dbg( p_aout, "device supports 4 channels" );
 455         }
 456     }
 457
 458     /* Test for stereo support */
 459     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 460     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 461                            p_aout->output.output.i_rate, VLC_TRUE )
 462         == VLC_SUCCESS )
 463     {
 464         val.i_int = AOUT_VAR_STEREO;
 465         text.psz_string = N_("Stereo");
 466         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 467         var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 468         msg_Dbg( p_aout, "device supports 2 channels" );
 469     }
 470
 471     /* Test for mono support */
 472     i_physical_channels = AOUT_CHAN_CENTER;
 473     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 474                            p_aout->output.output.i_rate, VLC_TRUE )
 475         == VLC_SUCCESS )
 476     {
 477         val.i_int = AOUT_VAR_MONO;
 478         text.psz_string = N_("Mono");
 479         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 480         msg_Dbg( p_aout, "device supports 1 channel" );
 481     }
 482
 483     /* Check the speaker configuration to determine which channel config should
 484      * be the default */
 485     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 486                                               &ui_speaker_config ) )
 487     {
 488         ui_speaker_config = DSSPEAKER_STEREO;
 489     }
 490     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 491     {
 492     case DSSPEAKER_5POINT1:
 493         val.i_int = AOUT_VAR_5_1;
 494         break;
 495     case DSSPEAKER_QUAD:
 496         val.i_int = AOUT_VAR_2F2R;
 497         break;
 498 #if 0 /* Lots of people just get their settings wrong and complain that
 499        * this is a problem with VLC so just don't ever set mono by default. */
 500     case DSSPEAKER_MONO:
 501         val.i_int = AOUT_VAR_MONO;
 502         break;
 503 #endif
 504     case DSSPEAKER_SURROUND:
 505     case DSSPEAKER_STEREO:
 506     default:
 507         val.i_int = AOUT_VAR_STEREO;
 508         break;
 509     }
 510     var_Set( p_aout, "audio-device", val );
 511
 512     /* Test for SPDIF support */
 513     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 514     {
 515         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 516                             p_aout->output.output.i_physical_channels,
 517                             aout_FormatNbChannels( &p_aout->output.output ),
 518                             p_aout->output.output.i_rate,
 519                             AOUT_SPDIF_SIZE, VLC_TRUE )
 520             == VLC_SUCCESS )
 521         {
 522             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 523             val.i_int = AOUT_VAR_SPDIF;
 524             text.psz_string = N_("A/52 over S/PDIF");
 525             var_Change( p_aout, "audio-device",
 526                         VLC_VAR_ADDCHOICE, &val, &text );
 527             if( config_GetInt( p_aout, "spdif" ) )
 528                 var_Set( p_aout, "audio-device", val );
 529         }
 530     }
 531
 532     var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
 533     if( val.i_int <= 0 )
 534     {
 535         /* Probe() has failed. */
 536         var_Destroy( p_aout, "audio-device" );
 537         return;
 538     }
 539
 540     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 541
 542     val.b_bool = VLC_TRUE;
 543     var_Set( p_aout, "intf-change", val );
 544 }
 545
 546 /*****************************************************************************
 547  * Play: we'll start playing the directsound buffer here because at least here
 548  *       we know the first buffer has been put in the aout fifo and we also
 549  *       know its date.
 550  *****************************************************************************/
 551 static void Play( aout_instance_t *p_aout )
 552 {
 553     if( !p_aout->output.p_sys->b_playing )
 554     {
 555         aout_buffer_t *p_buffer;
 556         int i;
 557
 558         p_aout->output.p_sys->b_playing = 1;
 559
 560         /* get the playing date of the first aout buffer */
 561         p_aout->output.p_sys->p_notif->start_date =
 562             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 563
 564         /* fill in the first samples */
 565         for( i = 0; i < FRAMES_NUM; i++ )
 566         {
 567             p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 568             if( !p_buffer ) break;
 569             FillBuffer( p_aout, i, p_buffer );
 570         }
 571
 572         /* wake up the audio output thread */
 573         SetEvent( p_aout->output.p_sys->p_notif->event );
 574     }
 575 }
 576
 577 /*****************************************************************************
 578  * CloseAudio: close the audio device
 579  *****************************************************************************/
 580 static void CloseAudio( vlc_object_t *p_this )
 581 {
 582     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 583     aout_sys_t *p_sys = p_aout->output.p_sys;
 584
 585     msg_Dbg( p_aout, "CloseAudio" );
 586
 587     /* kill the position notification thread, if any */
 588     if( p_sys->p_notif )
 589     {
 590         vlc_object_detach( p_sys->p_notif );
 591         if( p_sys->p_notif->b_thread )
 592         {
 593             p_sys->p_notif->b_die = 1;
 594
 595             /* wake up the audio thread if needed */
 596             if( !p_sys->b_playing ) SetEvent( p_sys->p_notif->event );
 597
 598             vlc_thread_join( p_sys->p_notif );
 599         }
 600         vlc_object_destroy( p_sys->p_notif );
 601     }
 602
 603     /* release the secondary buffer */
 604     DestroyDSBuffer( p_aout );
 605
 606     /* finally release the DirectSound object */
 607     if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
 608
 609     /* free DSOUND.DLL */
 610     if( p_sys->hdsound_dll ) FreeLibrary( p_sys->hdsound_dll );
 611
 612     if( p_aout->output.p_sys->p_device_guid )
 613         free( p_aout->output.p_sys->p_device_guid );
 614
 615     free( p_sys );
 616 }
 617
 618 /*****************************************************************************
 619  * CallBackDirectSoundEnum: callback to enumerate available devices
 620  *****************************************************************************/
 621 static int CALLBACK CallBackDirectSoundEnum( LPGUID p_guid, LPCSTR psz_desc,
 622                                              LPCSTR psz_mod, LPVOID _p_aout )
 623 {
 624     aout_instance_t *p_aout = (aout_instance_t *)_p_aout;
 625
 626     msg_Dbg( p_aout, "found device: %s", psz_desc );
 627
 628     if( p_aout->output.p_sys->i_device_id == 0 && p_guid )
 629     {
 630         p_aout->output.p_sys->p_device_guid = malloc( sizeof( GUID ) );
 631         *p_aout->output.p_sys->p_device_guid = *p_guid;
 632         msg_Dbg( p_aout, "using device: %s", psz_desc );
 633     }
 634
 635     p_aout->output.p_sys->i_device_id--;
 636     return 1;
 637 }
 638
 639 /*****************************************************************************
 640  * InitDirectSound: handle all the gory details of DirectSound initialisation
 641  *****************************************************************************/
 642 static int InitDirectSound( aout_instance_t *p_aout )
 643 {
 644     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 645     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACK, LPVOID);
 646
 647     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 648     if( p_aout->output.p_sys->hdsound_dll == NULL )
 649     {
 650         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 651         goto error;
 652     }
 653
 654     OurDirectSoundCreate = (void *)
 655         GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 656                         "DirectSoundCreate" );
 657     if( OurDirectSoundCreate == NULL )
 658     {
 659         msg_Warn( p_aout, "GetProcAddress FAILED" );
 660         goto error;
 661     }
 662
 663     /* Get DirectSoundEnumerate */
 664     OurDirectSoundEnumerate = (void *)
 665        GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 666                        "DirectSoundEnumerateA" );
 667     if( OurDirectSoundEnumerate )
 668     {
 669         /* Attempt enumeration */
 670         if( FAILED( OurDirectSoundEnumerate( CallBackDirectSoundEnum,
 671                                              p_aout ) ) )
 672         {
 673             msg_Dbg( p_aout, "enumeration of DirectSound devices failed" );
 674         }
 675     }
 676
 677     /* Create the direct sound object */
 678     if FAILED( OurDirectSoundCreate( p_aout->output.p_sys->p_device_guid,
 679                                      &p_aout->output.p_sys->p_dsobject,
 680                                      NULL ) )
 681     {
 682         msg_Warn( p_aout, "cannot create a direct sound device" );
 683         goto error;
 684     }
 685
 686     /* Set DirectSound Cooperative level, ie what control we want over Windows
 687      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 688      * settings of the primary buffer, but also that only the sound of our
 689      * application will be hearable when it will have the focus.
 690      * !!! (this is not really working as intended yet because to set the
 691      * cooperative level you need the window handle of your application, and
 692      * I don't know of any easy way to get it. Especially since we might play
 693      * sound without any video, and so what window handle should we use ???
 694      * The hack for now is to use the Desktop window handle - it seems to be
 695      * working */
 696     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 697                                           GetDesktopWindow(),
 698                                           DSSCL_EXCLUSIVE) )
 699     {
 700         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 701     }
 702
 703     return VLC_SUCCESS;
 704
 705  error:
 706     p_aout->output.p_sys->p_dsobject = NULL;
 707     if( p_aout->output.p_sys->hdsound_dll )
 708     {
 709         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 710         p_aout->output.p_sys->hdsound_dll = NULL;
 711     }
 712     return VLC_EGENERIC;
 713
 714 }
 715
 716 /*****************************************************************************
 717  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 718  *****************************************************************************
 719  * This function creates the buffer we'll use to play audio.
 720  * In DirectSound there are two kinds of buffers:
 721  * - the primary buffer: which is the actual buffer that the soundcard plays
 722  * - the secondary buffer(s): these buffers are the one actually used by
 723  *    applications and DirectSound takes care of mixing them into the primary.
 724  *
 725  * Once you create a secondary buffer, you cannot change its format anymore so
 726  * you have to release the current one and create another.
 727  *****************************************************************************/
 728 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 729                            int i_channels, int i_nb_channels, int i_rate,
 730                            int i_bytes_per_frame, vlc_bool_t b_probe )
 731 {
 732     WAVEFORMATEXTENSIBLE waveformat;
 733     DSBUFFERDESC         dsbdesc;
 734     unsigned int         i;
 735
 736     /* First set the sound buffer format */
 737     waveformat.dwChannelMask = 0;
 738     for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
 739     {
 740         if( i_channels & pi_channels_src[i] )
 741             waveformat.dwChannelMask |= pi_channels_in[i];
 742     }
 743
 744     switch( i_format )
 745     {
 746     case VLC_FOURCC('s','p','d','i'):
 747         i_nb_channels = 2;
 748         /* To prevent channel re-ordering */
 749         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 750         waveformat.Format.wBitsPerSample = 16;
 751         waveformat.Samples.wValidBitsPerSample =
 752             waveformat.Format.wBitsPerSample;
 753         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 754         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 755         break;
 756
 757     case VLC_FOURCC('f','l','3','2'):
 758         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 759         waveformat.Samples.wValidBitsPerSample =
 760             waveformat.Format.wBitsPerSample;
 761         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 762         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 763         break;
 764
 765     case VLC_FOURCC('s','1','6','l'):
 766         waveformat.Format.wBitsPerSample = 16;
 767         waveformat.Samples.wValidBitsPerSample =
 768             waveformat.Format.wBitsPerSample;
 769         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 770         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 771         break;
 772     }
 773
 774     waveformat.Format.nChannels = i_nb_channels;
 775     waveformat.Format.nSamplesPerSec = i_rate;
 776     waveformat.Format.nBlockAlign =
 777         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 778     waveformat.Format.nAvgBytesPerSec =
 779         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 780
 781     p_aout->output.p_sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
 782     p_aout->output.p_sys->i_channels = i_nb_channels;
 783
 784     /* Then fill in the direct sound descriptor */
 785     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 786     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 787     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 788                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 789
 790     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 791     if( i_nb_channels <= 2 )
 792     {
 793         waveformat.Format.cbSize = 0;
 794     }
 795     else
 796     {
 797         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 798         waveformat.Format.cbSize =
 799             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 800
 801         /* Needed for 5.1 on emu101k */
 802         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 803     }
 804
 805     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 806     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 807
 808     if FAILED( IDirectSound_CreateSoundBuffer(
 809                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 810                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 811     {
 812         if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
 813         {
 814             /* Try without DSBCAPS_LOCHARDWARE */
 815             dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 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                 return VLC_EGENERIC;
 821             }
 822             if( !b_probe )
 823                 msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
 824         }
 825         else
 826         {
 827             return VLC_EGENERIC;
 828         }
 829     }
 830
 831     /* Stop here if we were just probing */
 832     if( b_probe )
 833     {
 834         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 835         p_aout->output.p_sys->p_dsbuffer = NULL;
 836         return VLC_SUCCESS;
 837     }
 838
 839     p_aout->output.p_sys->i_frame_size = i_bytes_per_frame;
 840     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 841     p_aout->output.p_sys->b_chan_reorder =
 842         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
 843                                   waveformat.dwChannelMask, i_nb_channels,
 844                                   p_aout->output.p_sys->pi_chan_table );
 845
 846     if( p_aout->output.p_sys->b_chan_reorder )
 847     {
 848         msg_Dbg( p_aout, "channel reordering needed" );
 849     }
 850
 851     return VLC_SUCCESS;
 852 }
 853
 854 /*****************************************************************************
 855  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 856  *****************************************************************************
 857  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 858  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 859  ****************************************************************************/
 860 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 861                               int i_channels, int i_nb_channels, int i_rate,
 862                               vlc_bool_t b_probe )
 863 {
 864     vlc_value_t val;
 865
 866     var_Get( p_aout, "directx-audio-float32", &val );
 867
 868     /* Float32 audio samples are not supported for 5.1 output on the emu101k */
 869
 870     if( !val.b_bool || i_nb_channels > 2 ||
 871         CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
 872                         i_channels, i_nb_channels, i_rate,
 873                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 874         != VLC_SUCCESS )
 875     {
 876         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
 877                              i_channels, i_nb_channels, i_rate,
 878                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 879              != VLC_SUCCESS )
 880         {
 881             return VLC_EGENERIC;
 882         }
 883         else
 884         {
 885             *i_format = VLC_FOURCC('s','1','6','l');
 886             return VLC_SUCCESS;
 887         }
 888     }
 889     else
 890     {
 891         *i_format = VLC_FOURCC('f','l','3','2');
 892         return VLC_SUCCESS;
 893     }
 894 }
 895
 896 /*****************************************************************************
 897  * DestroyDSBuffer
 898  *****************************************************************************
 899  * This function destroys the secondary buffer.
 900  *****************************************************************************/
 901 static void DestroyDSBuffer( aout_instance_t *p_aout )
 902 {
 903     if( p_aout->output.p_sys->p_dsbuffer )
 904     {
 905         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 906         p_aout->output.p_sys->p_dsbuffer = NULL;
 907     }
 908 }
 909
 910 /*****************************************************************************
 911  * FillBuffer: Fill in one of the direct sound frame buffers.
 912  *****************************************************************************
 913  * Returns VLC_SUCCESS on success.
 914  *****************************************************************************/
 915 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 916                        aout_buffer_t *p_buffer )
 917 {
 918     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 919     aout_sys_t *p_sys = p_aout->output.p_sys;
 920     void *p_write_position, *p_wrap_around;
 921     long l_bytes1, l_bytes2;
 922     HRESULT dsresult;
 923
 924     /* Before copying anything, we have to lock the buffer */
 925     dsresult = IDirectSoundBuffer_Lock(
 926                 p_sys->p_dsbuffer,                              /* DS buffer */
 927                 i_frame * p_notif->i_frame_size,             /* Start offset */
 928                 p_notif->i_frame_size,                    /* Number of bytes */
 929                 &p_write_position,                  /* Address of lock start */
 930                 &l_bytes1,       /* Count of bytes locked before wrap around */
 931                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 932                 &l_bytes2,               /* Count of bytes after wrap around */
 933                 0 );                                                /* Flags */
 934     if( dsresult == DSERR_BUFFERLOST )
 935     {
 936         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
 937         dsresult = IDirectSoundBuffer_Lock(
 938                                p_sys->p_dsbuffer,
 939                                i_frame * p_notif->i_frame_size,
 940                                p_notif->i_frame_size,
 941                                &p_write_position,
 942                                &l_bytes1,
 943                                &p_wrap_around,
 944                                &l_bytes2,
 945                                0 );
 946     }
 947     if( dsresult != DS_OK )
 948     {
 949         msg_Warn( p_notif, "cannot lock buffer" );
 950         if( p_buffer ) aout_BufferFree( p_buffer );
 951         return VLC_EGENERIC;
 952     }
 953
 954     if( p_buffer == NULL )
 955     {
 956         memset( p_write_position, 0, l_bytes1 );
 957     }
 958     else
 959     {
 960         if( p_sys->b_chan_reorder )
 961         {
 962             /* Do the channel reordering here */
 963             aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_nb_bytes,
 964                                  p_sys->i_channels, p_sys->pi_chan_table,
 965                                  p_sys->i_bits_per_sample );
 966         }
 967
 968         p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
 969                                   l_bytes1 );
 970         aout_BufferFree( p_buffer );
 971     }
 972
 973     /* Now the data has been copied, unlock the buffer */
 974     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
 975                                p_wrap_around, l_bytes2 );
 976
 977     p_notif->i_write_slot = (i_frame + 1) % FRAMES_NUM;
 978     return VLC_SUCCESS;
 979 }
 980
 981 /*****************************************************************************
 982  * DirectSoundThread: this thread will capture play notification events.
 983  *****************************************************************************
 984  * We use this thread to emulate a callback mechanism. The thread probes for
 985  * event notification and fills up the DS secondary buffer when needed.
 986  *****************************************************************************/
 987 static void DirectSoundThread( notification_thread_t *p_notif )
 988 {
 989     aout_instance_t *p_aout = p_notif->p_aout;
 990     vlc_bool_t b_sleek;
 991     mtime_t last_time;
 992     HRESULT dsresult;
 993     long l_queued = 0;
 994
 995     /* We don't want any resampling when using S/PDIF output */
 996     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
 997
 998     /* Tell the main thread that we are ready */
 999     vlc_thread_ready( p_notif );
1000
1001     msg_Dbg( p_notif, "DirectSoundThread ready" );
1002
1003     /* Wait here until Play() is called */
1004     WaitForSingleObject( p_notif->event, INFINITE );
1005
1006     if( !p_notif->b_die )
1007     {
1008         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
1009
1010         /* start playing the buffer */
1011         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
1012                                         0,                         /* Unused */
1013                                         0,                         /* Unused */
1014                                         DSBPLAY_LOOPING );          /* Flags */
1015         if( dsresult == DSERR_BUFFERLOST )
1016         {
1017             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
1018             dsresult = IDirectSoundBuffer_Play(
1019                                             p_aout->output.p_sys->p_dsbuffer,
1020                                             0,                     /* Unused */
1021                                             0,                     /* Unused */
1022                                             DSBPLAY_LOOPING );      /* Flags */
1023         }
1024         if( dsresult != DS_OK )
1025         {
1026             msg_Err( p_aout, "cannot start playing buffer" );
1027         }
1028     }
1029     last_time = mdate();
1030
1031     while( !p_notif->b_die )
1032     {
1033         long l_read, l_free_slots;
1034         mtime_t mtime = mdate();
1035         int i;
1036
1037         /*
1038          * Fill in as much audio data as we can in our circular buffer
1039          */
1040
1041         /* Find out current play position */
1042         if FAILED( IDirectSoundBuffer_GetCurrentPosition(
1043                    p_aout->output.p_sys->p_dsbuffer, &l_read, NULL ) )
1044         {
1045             msg_Err( p_aout, "GetCurrentPosition() failed!" );
1046             l_read = 0;
1047         }
1048
1049         /* Detect underruns */
1050         if( l_queued && mtime - last_time >
1051             I64C(1000000) * l_queued / p_aout->output.output.i_rate )
1052         {
1053             msg_Dbg( p_aout, "detected underrun!" );
1054         }
1055         last_time = mtime;
1056
1057         /* Try to fill in as many frame buffers as possible */
1058         l_read /= p_aout->output.output.i_bytes_per_frame;
1059         l_queued = p_notif->i_write_slot * FRAME_SIZE - l_read;
1060         if( l_queued < 0 ) l_queued += (FRAME_SIZE * FRAMES_NUM);
1061         l_free_slots = (FRAMES_NUM * FRAME_SIZE - l_queued) / FRAME_SIZE;
1062
1063         for( i = 0; i < l_free_slots; i++ )
1064         {
1065             aout_buffer_t *p_buffer = aout_OutputNextBuffer( p_aout,
1066                 mtime + I64C(1000000) * (i * FRAME_SIZE + l_queued) /
1067                 p_aout->output.output.i_rate, b_sleek );
1068
1069             /* If there is no audio data available and we have some buffered
1070              * already, then just wait for the next time */
1071             if( !p_buffer && (i || l_queued / FRAME_SIZE) ) break;
1072
1073             if( FillBuffer( p_aout, p_notif->i_write_slot % FRAMES_NUM,
1074                             p_buffer ) != VLC_SUCCESS ) break;
1075         }
1076
1077         /* Sleep a reasonable amount of time */
1078         l_queued += (i * FRAME_SIZE);
1079         msleep( I64C(1000000) * l_queued / p_aout->output.output.i_rate / 2 );
1080     }
1081
1082     /* make sure the buffer isn't playing */
1083     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1084
1085     /* free the event */
1086     CloseHandle( p_notif->event );
1087
1088     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1089 }