git.sesse.net Git - vlc/blob - modules/audio_output/directx.c

   1 /*****************************************************************************
   2  * directx.c: Windows DirectX audio output method
   3  *****************************************************************************
   4  * Copyright (C) 2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_aout.h>
  36
  37 #include <windows.h>
  38 #include <mmsystem.h>
  39 #include <dsound.h>
  40
  41 #define FRAME_SIZE ((int)p_aout->output.output.i_rate/20) /* Size in samples */
  42 #define FRAMES_NUM 8                                      /* Needs to be > 3 */
  43
  44 /*****************************************************************************
  45  * DirectSound GUIDs.
  46  * Defining them here allows us to get rid of the dxguid library during
  47  * the linking stage.
  48  *****************************************************************************/
  49 #include <initguid.h>
  50
  51 /*****************************************************************************
  52  * Useful macros
  53  *****************************************************************************/
  54 #ifndef WAVE_FORMAT_IEEE_FLOAT
  55 #   define WAVE_FORMAT_IEEE_FLOAT 0x0003
  56 #endif
  57
  58 #ifndef WAVE_FORMAT_DOLBY_AC3_SPDIF
  59 #   define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
  60 #endif
  61
  62 #ifndef WAVE_FORMAT_EXTENSIBLE
  63 #define  WAVE_FORMAT_EXTENSIBLE   0xFFFE
  64 #endif
  65
  66 #ifndef SPEAKER_FRONT_LEFT
  67 #   define SPEAKER_FRONT_LEFT             0x1
  68 #   define SPEAKER_FRONT_RIGHT            0x2
  69 #   define SPEAKER_FRONT_CENTER           0x4
  70 #   define SPEAKER_LOW_FREQUENCY          0x8
  71 #   define SPEAKER_BACK_LEFT              0x10
  72 #   define SPEAKER_BACK_RIGHT             0x20
  73 #   define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
  74 #   define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
  75 #   define SPEAKER_BACK_CENTER            0x100
  76 #   define SPEAKER_SIDE_LEFT              0x200
  77 #   define SPEAKER_SIDE_RIGHT             0x400
  78 #   define SPEAKER_TOP_CENTER             0x800
  79 #   define SPEAKER_TOP_FRONT_LEFT         0x1000
  80 #   define SPEAKER_TOP_FRONT_CENTER       0x2000
  81 #   define SPEAKER_TOP_FRONT_RIGHT        0x4000
  82 #   define SPEAKER_TOP_BACK_LEFT          0x8000
  83 #   define SPEAKER_TOP_BACK_CENTER        0x10000
  84 #   define SPEAKER_TOP_BACK_RIGHT         0x20000
  85 #   define SPEAKER_RESERVED               0x80000000
  86 #endif
  87
  88 #ifndef DSSPEAKER_DSSPEAKER_DIRECTOUT
  89 #   define DSSPEAKER_DSSPEAKER_DIRECTOUT         0x00000000
  90 #endif
  91 #ifndef DSSPEAKER_HEADPHONE
  92 #   define DSSPEAKER_HEADPHONE         0x00000001
  93 #endif
  94 #ifndef DSSPEAKER_MONO
  95 #   define DSSPEAKER_MONO              0x00000002
  96 #endif
  97 #ifndef DSSPEAKER_QUAD
  98 #   define DSSPEAKER_QUAD              0x00000003
  99 #endif
 100 #ifndef DSSPEAKER_STEREO
 101 #   define DSSPEAKER_STEREO            0x00000004
 102 #endif
 103 #ifndef DSSPEAKER_SURROUND
 104 #   define DSSPEAKER_SURROUND          0x00000005
 105 #endif
 106 #ifndef DSSPEAKER_5POINT1
 107 #   define DSSPEAKER_5POINT1           0x00000006
 108 #endif
 109 #ifndef DSSPEAKER_7POINT1
 110 #   define DSSPEAKER_7POINT1           0x00000007
 111 #endif
 112 #ifndef DSSPEAKER_7POINT1_SURROUND
 113 #   define DSSPEAKER_7POINT1_SURROUND           0x00000008
 114 #endif
 115 #ifndef DSSPEAKER_7POINT1_WIDE
 116 #   define DSSPEAKER_7POINT1_WIDE           DSSPEAKER_7POINT1
 117 #endif
 118
 119 #ifndef _WAVEFORMATEXTENSIBLE_
 120 typedef struct {
 121     WAVEFORMATEX    Format;
 122     union {
 123         WORD wValidBitsPerSample;       /* bits of precision  */
 124         WORD wSamplesPerBlock;          /* valid if wBitsPerSample==0 */
 125         WORD wReserved;                 /* If neither applies, set to zero. */
 126     } Samples;
 127     DWORD           dwChannelMask;      /* which channels are */
 128                                         /* present in stream  */
 129     GUID            SubFormat;
 130 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
 131 #endif
 132
 133 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, WAVE_FORMAT_IEEE_FLOAT, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 134 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_PCM, WAVE_FORMAT_PCM, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 135 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF, WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 136
 137 /*****************************************************************************
 138  * notification_thread_t: DirectX event thread
 139  *****************************************************************************/
 140 typedef struct notification_thread_t
 141 {
 142     VLC_COMMON_MEMBERS
 143
 144     aout_instance_t *p_aout;
 145     int i_frame_size;                          /* size in bytes of one frame */
 146     int i_write_slot;       /* current write position in our circular buffer */
 147
 148     mtime_t start_date;
 149     HANDLE event;
 150
 151 } notification_thread_t;
 152
 153 /*****************************************************************************
 154  * aout_sys_t: directx audio output method descriptor
 155  *****************************************************************************
 156  * This structure is part of the audio output thread descriptor.
 157  * It describes the direct sound specific properties of an audio device.
 158  *****************************************************************************/
 159 struct aout_sys_t
 160 {
 161     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
 162
 163     int                 i_device_id;                 /*  user defined device */
 164     LPGUID              p_device_guid;
 165
 166     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
 167     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
 168                                        * takes care of mixing all the
 169                                        * secondary buffers into the primary) */
 170
 171     notification_thread_t *p_notif;                  /* DirectSoundThread id */
 172
 173     int b_playing;                                         /* playing status */
 174
 175     int i_frame_size;                         /* Size in bytes of one frame */
 176
 177     bool b_chan_reorder;              /* do we need channel reordering */
 178     int pi_chan_table[AOUT_CHAN_MAX];
 179     uint32_t i_channel_mask;
 180     uint32_t i_bits_per_sample;
 181     uint32_t i_channels;
 182 };
 183
 184 static const uint32_t pi_channels_src[] =
 185     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 186       AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
 187       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER,
 188       AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 };
 189 static const uint32_t pi_channels_in[] =
 190     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 191       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT,
 192       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT, SPEAKER_BACK_CENTER,
 193       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY, 0 };
 194 static const uint32_t pi_channels_out[] =
 195     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 196       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY,
 197       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 198       SPEAKER_BACK_CENTER,
 199       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT, 0 };
 200
 201 /*****************************************************************************
 202  * Local prototypes.
 203  *****************************************************************************/
 204 static int  OpenAudio  ( vlc_object_t * );
 205 static void CloseAudio ( vlc_object_t * );
 206 static void Play       ( aout_instance_t * );
 207
 208 /* local functions */
 209 static void Probe             ( aout_instance_t * );
 210 static int  InitDirectSound   ( aout_instance_t * );
 211 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, bool );
 212 static int  CreateDSBufferPCM ( aout_instance_t *, int*, int, int, int, bool );
 213 static void DestroyDSBuffer   ( aout_instance_t * );
 214 static void* DirectSoundThread( vlc_object_t * );
 215 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 216
 217 /*****************************************************************************
 218  * Module descriptor
 219  *****************************************************************************/
 220 #define DEVICE_TEXT N_("Output device")
 221 #define DEVICE_LONGTEXT N_( \
 222     "DirectX device number: 0 default device, 1..N device by number" \
 223     "(Note that the default device appears as 0 AND another number)." )
 224 #define FLOAT_TEXT N_("Use float32 output")
 225 #define FLOAT_LONGTEXT N_( \
 226     "The option allows you to enable or disable the high-quality float32 " \
 227     "audio output mode (which is not well supported by some soundcards)." )
 228
 229 vlc_module_begin ()
 230     set_description( N_("DirectX audio output") )
 231     set_shortname( "DirectX" )
 232     set_capability( "audio output", 100 )
 233     set_category( CAT_AUDIO )
 234     set_subcategory( SUBCAT_AUDIO_AOUT )
 235     add_shortcut( "directx" )
 236     add_integer( "directx-audio-device", 0, NULL, DEVICE_TEXT,
 237                  DEVICE_LONGTEXT, true );
 238     add_bool( "directx-audio-float32", 0, 0, FLOAT_TEXT,
 239               FLOAT_LONGTEXT, true );
 240     set_callbacks( OpenAudio, CloseAudio )
 241 vlc_module_end ()
 242
 243 /*****************************************************************************
 244  * OpenAudio: open the audio device
 245  *****************************************************************************
 246  * This function opens and setups Direct Sound.
 247  *****************************************************************************/
 248 static int OpenAudio( vlc_object_t *p_this )
 249 {
 250     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 251     vlc_value_t val;
 252
 253     msg_Dbg( p_aout, "OpenAudio" );
 254
 255    /* Allocate structure */
 256     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 257     if( p_aout->output.p_sys == NULL )
 258         return VLC_ENOMEM;
 259
 260     /* Initialize some variables */
 261     p_aout->output.p_sys->p_dsobject = NULL;
 262     p_aout->output.p_sys->p_dsbuffer = NULL;
 263     p_aout->output.p_sys->p_notif = NULL;
 264     p_aout->output.p_sys->b_playing = 0;
 265
 266     p_aout->output.pf_play = Play;
 267     aout_VolumeSoftInit( p_aout );
 268
 269     /* Retrieve config values */
 270     var_Create( p_aout, "directx-audio-float32",
 271                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 272     var_Create( p_aout, "directx-audio-device",
 273                 VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
 274     var_Get( p_aout, "directx-audio-device", &val );
 275     p_aout->output.p_sys->i_device_id = val.i_int;
 276     p_aout->output.p_sys->p_device_guid = 0;
 277
 278     /* Initialise DirectSound */
 279     if( InitDirectSound( p_aout ) )
 280     {
 281         msg_Err( p_aout, "cannot initialize DirectSound" );
 282         goto error;
 283     }
 284
 285     if( var_Type( p_aout, "audio-device" ) == 0 )
 286     {
 287         Probe( p_aout );
 288     }
 289
 290     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 291     {
 292         /* Probe() has failed. */
 293         goto error;
 294     }
 295
 296     /* Open the device */
 297     if( val.i_int == AOUT_VAR_SPDIF )
 298     {
 299         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 300
 301         /* Calculate the frame size in bytes */
 302         p_aout->output.i_nb_samples = A52_FRAME_NB;
 303         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 304         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 305         p_aout->output.p_sys->i_frame_size =
 306             p_aout->output.output.i_bytes_per_frame;
 307
 308         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 309                             p_aout->output.output.i_physical_channels,
 310                             aout_FormatNbChannels( &p_aout->output.output ),
 311                             p_aout->output.output.i_rate,
 312                             p_aout->output.p_sys->i_frame_size, false )
 313             != VLC_SUCCESS )
 314         {
 315             msg_Err( p_aout, "cannot open directx audio device" );
 316             free( p_aout->output.p_sys );
 317             return VLC_EGENERIC;
 318         }
 319
 320         aout_VolumeNoneInit( p_aout );
 321     }
 322     else
 323     {
 324         if( val.i_int == AOUT_VAR_5_1 )
 325         {
 326             p_aout->output.output.i_physical_channels
 327                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 328                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 329                    | AOUT_CHAN_LFE;
 330         }
 331         else if( val.i_int == AOUT_VAR_7_1 )
 332         {
 333                     p_aout->output.output.i_physical_channels
 334                         = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 335                            | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 336                            | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
 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, 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         aout_VolumeSoftInit( p_aout );
 376     }
 377
 378     /* Now we need to setup our DirectSound play notification structure */
 379     p_aout->output.p_sys->p_notif =
 380         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 381     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 382
 383     p_aout->output.p_sys->p_notif->event = CreateEvent( 0, FALSE, FALSE, 0 );
 384     p_aout->output.p_sys->p_notif->i_frame_size =
 385         p_aout->output.p_sys->i_frame_size;
 386
 387     /* then launch the notification thread */
 388     msg_Dbg( p_aout, "creating DirectSoundThread" );
 389     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 390                            "DirectSound Notification Thread",
 391                            DirectSoundThread,
 392                            VLC_THREAD_PRIORITY_HIGHEST, false ) )
 393     {
 394         msg_Err( p_aout, "cannot create DirectSoundThread" );
 395         CloseHandle( p_aout->output.p_sys->p_notif->event );
 396         vlc_object_release( p_aout->output.p_sys->p_notif );
 397         p_aout->output.p_sys->p_notif = NULL;
 398         goto error;
 399     }
 400
 401     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 402
 403     return VLC_SUCCESS;
 404
 405  error:
 406     CloseAudio( VLC_OBJECT(p_aout) );
 407     return VLC_EGENERIC;
 408 }
 409
 410 /*****************************************************************************
 411  * Probe: probe the audio device for available formats and channels
 412  *****************************************************************************/
 413 static void Probe( aout_instance_t * p_aout )
 414 {
 415     vlc_value_t val, text;
 416     int i_format;
 417     unsigned int i_physical_channels;
 418     DWORD ui_speaker_config;
 419     bool is_default_output_set = false;
 420
 421     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 422     text.psz_string = _("Audio Device");
 423     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 424
 425     /* Test for 5.1 support */
 426     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 427                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 428                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 429     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 430     {
 431         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 432                                p_aout->output.output.i_rate, true )
 433             == VLC_SUCCESS )
 434         {
 435             val.i_int = AOUT_VAR_5_1;
 436             text.psz_string = "5.1";
 437             var_Change( p_aout, "audio-device",
 438                         VLC_VAR_ADDCHOICE, &val, &text );
 439             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 440             is_default_output_set = true;
 441             msg_Dbg( p_aout, "device supports 5.1 channels" );
 442         }
 443     }
 444
 445     /* Test for 7.1 support */
 446     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 447                              AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 448                              AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
 449                              AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 450        if( p_aout->output.output.i_physical_channels == i_physical_channels )
 451        {
 452            if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 8,
 453                                   p_aout->output.output.i_rate, true )
 454                == VLC_SUCCESS )
 455            {
 456                val.i_int = AOUT_VAR_7_1;
 457                text.psz_string = "7.1";
 458                var_Change( p_aout, "audio-device",
 459                            VLC_VAR_ADDCHOICE, &val, &text );
 460                var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 461                is_default_output_set = true;
 462                msg_Dbg( p_aout, "device supports 7.1 channels" );
 463            }
 464        }
 465
 466     /* Test for 3 Front 2 Rear support */
 467     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 468                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 469                           AOUT_CHAN_REARRIGHT;
 470     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 471     {
 472         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 5,
 473                                p_aout->output.output.i_rate, true )
 474             == VLC_SUCCESS )
 475         {
 476             val.i_int = AOUT_VAR_3F2R;
 477             text.psz_string = N_("3 Front 2 Rear");
 478             var_Change( p_aout, "audio-device",
 479                         VLC_VAR_ADDCHOICE, &val, &text );
 480             if(!is_default_output_set)
 481             {
 482                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 483                 is_default_output_set = true;
 484             }
 485             msg_Dbg( p_aout, "device supports 5 channels" );
 486         }
 487     }
 488
 489     /* Test for 2 Front 2 Rear support */
 490     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 491                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 492     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 493         == i_physical_channels )
 494     {
 495         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 496                                p_aout->output.output.i_rate, true )
 497             == VLC_SUCCESS )
 498         {
 499             val.i_int = AOUT_VAR_2F2R;
 500             text.psz_string = N_("2 Front 2 Rear");
 501             var_Change( p_aout, "audio-device",
 502                         VLC_VAR_ADDCHOICE, &val, &text );
 503             if(!is_default_output_set)
 504             {
 505                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 506                 is_default_output_set = true;
 507             }
 508             msg_Dbg( p_aout, "device supports 4 channels" );
 509         }
 510     }
 511
 512     /* Test for stereo support */
 513     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 514     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 515                            p_aout->output.output.i_rate, true )
 516         == VLC_SUCCESS )
 517     {
 518         val.i_int = AOUT_VAR_STEREO;
 519         text.psz_string = N_("Stereo");
 520         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 521         if(!is_default_output_set)
 522         {
 523             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 524             is_default_output_set = true;
 525             msg_Dbg( p_aout, "device supports 2 channels (DEFAULT!)" );
 526         }
 527         msg_Dbg( p_aout, "device supports 2 channels" );
 528     }
 529
 530     /* Test for mono support */
 531     i_physical_channels = AOUT_CHAN_CENTER;
 532     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 533                            p_aout->output.output.i_rate, true )
 534         == VLC_SUCCESS )
 535     {
 536         val.i_int = AOUT_VAR_MONO;
 537         text.psz_string = N_("Mono");
 538         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 539         msg_Dbg( p_aout, "device supports 1 channel" );
 540     }
 541
 542     /* Check the speaker configuration to determine which channel config should
 543      * be the default */
 544     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 545                                               &ui_speaker_config ) )
 546     {
 547         ui_speaker_config = DSSPEAKER_STEREO;
 548         msg_Dbg( p_aout, "GetSpeakerConfig failed" );
 549     }
 550     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 551     {
 552     case DSSPEAKER_7POINT1:
 553         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 7.1" );
 554         val.i_int = AOUT_VAR_7_1;
 555         break;
 556     case DSSPEAKER_5POINT1:
 557         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 5.1" );
 558         val.i_int = AOUT_VAR_5_1;
 559         break;
 560     case DSSPEAKER_QUAD:
 561         msg_Dbg( p_aout, "Windows says your SpeakerConfig is Quad" );
 562         val.i_int = AOUT_VAR_2F2R;
 563         break;
 564 #if 0 /* Lots of people just get their settings wrong and complain that
 565        * this is a problem with VLC so just don't ever set mono by default. */
 566     case DSSPEAKER_MONO:
 567         val.i_int = AOUT_VAR_MONO;
 568         break;
 569 #endif
 570     case DSSPEAKER_SURROUND:
 571         msg_Dbg( p_aout, "Windows says your SpeakerConfig is surround" );
 572     case DSSPEAKER_STEREO:
 573         msg_Dbg( p_aout, "Windows says your SpeakerConfig is stereo" );
 574     default:
 575         /* If nothing else is found, choose stereo output */
 576         val.i_int = AOUT_VAR_STEREO;
 577         break;
 578     }
 579     var_Set( p_aout, "audio-device", val );
 580
 581     /* Test for SPDIF support */
 582     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 583     {
 584         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 585                             p_aout->output.output.i_physical_channels,
 586                             aout_FormatNbChannels( &p_aout->output.output ),
 587                             p_aout->output.output.i_rate,
 588                             AOUT_SPDIF_SIZE, true )
 589             == VLC_SUCCESS )
 590         {
 591             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 592             val.i_int = AOUT_VAR_SPDIF;
 593             text.psz_string = N_("A/52 over S/PDIF");
 594             var_Change( p_aout, "audio-device",
 595                         VLC_VAR_ADDCHOICE, &val, &text );
 596             if( config_GetInt( p_aout, "spdif" ) )
 597                 var_Set( p_aout, "audio-device", val );
 598         }
 599     }
 600
 601     var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
 602     if( val.i_int <= 0 )
 603     {
 604         /* Probe() has failed. */
 605         var_Destroy( p_aout, "audio-device" );
 606         return;
 607     }
 608
 609     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 610
 611     val.b_bool = true;
 612     var_Set( p_aout, "intf-change", val );
 613 }
 614
 615 /*****************************************************************************
 616  * Play: we'll start playing the directsound buffer here because at least here
 617  *       we know the first buffer has been put in the aout fifo and we also
 618  *       know its date.
 619  *****************************************************************************/
 620 static void Play( aout_instance_t *p_aout )
 621 {
 622     if( !p_aout->output.p_sys->b_playing )
 623     {
 624         aout_buffer_t *p_buffer;
 625         int i;
 626
 627         p_aout->output.p_sys->b_playing = 1;
 628
 629         /* get the playing date of the first aout buffer */
 630         p_aout->output.p_sys->p_notif->start_date =
 631             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 632
 633         /* fill in the first samples */
 634         for( i = 0; i < FRAMES_NUM; i++ )
 635         {
 636             p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 637             if( !p_buffer ) break;
 638             FillBuffer( p_aout, i, p_buffer );
 639         }
 640
 641         /* wake up the audio output thread */
 642         SetEvent( p_aout->output.p_sys->p_notif->event );
 643     }
 644 }
 645
 646 /*****************************************************************************
 647  * CloseAudio: close the audio device
 648  *****************************************************************************/
 649 static void CloseAudio( vlc_object_t *p_this )
 650 {
 651     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 652     aout_sys_t *p_sys = p_aout->output.p_sys;
 653
 654     msg_Dbg( p_aout, "closing audio device" );
 655
 656     /* kill the position notification thread, if any */
 657     if( p_sys->p_notif )
 658     {
 659         vlc_object_detach( p_sys->p_notif );
 660         vlc_object_kill( p_sys->p_notif );
 661         /* wake up the audio thread if needed */
 662         if( !p_sys->b_playing ) SetEvent( p_sys->p_notif->event );
 663
 664         vlc_thread_join( p_sys->p_notif );
 665         vlc_object_release( p_sys->p_notif );
 666     }
 667
 668     /* release the secondary buffer */
 669     DestroyDSBuffer( p_aout );
 670
 671     /* finally release the DirectSound object */
 672     if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
 673
 674     /* free DSOUND.DLL */
 675     if( p_sys->hdsound_dll ) FreeLibrary( p_sys->hdsound_dll );
 676
 677     free( p_aout->output.p_sys->p_device_guid );
 678     free( p_sys );
 679 }
 680
 681 /*****************************************************************************
 682  * CallBackDirectSoundEnum: callback to enumerate available devices
 683  *****************************************************************************/
 684 static int CALLBACK CallBackDirectSoundEnum( LPGUID p_guid, LPCSTR psz_desc,
 685                                              LPCSTR psz_mod, LPVOID _p_aout )
 686 {
 687     aout_instance_t *p_aout = (aout_instance_t *)_p_aout;
 688
 689     msg_Dbg( p_aout, "found device: %s", psz_desc );
 690
 691     if( p_aout->output.p_sys->i_device_id == 0 && p_guid )
 692     {
 693         p_aout->output.p_sys->p_device_guid = malloc( sizeof( GUID ) );
 694         *p_aout->output.p_sys->p_device_guid = *p_guid;
 695         msg_Dbg( p_aout, "using device: %s", psz_desc );
 696     }
 697
 698     p_aout->output.p_sys->i_device_id--;
 699     return 1;
 700 }
 701
 702 /*****************************************************************************
 703  * InitDirectSound: handle all the gory details of DirectSound initialisation
 704  *****************************************************************************/
 705 static int InitDirectSound( aout_instance_t *p_aout )
 706 {
 707     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 708     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACK, LPVOID);
 709
 710     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 711     if( p_aout->output.p_sys->hdsound_dll == NULL )
 712     {
 713         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 714         goto error;
 715     }
 716
 717     OurDirectSoundCreate = (void *)
 718         GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 719                         "DirectSoundCreate" );
 720     if( OurDirectSoundCreate == NULL )
 721     {
 722         msg_Warn( p_aout, "GetProcAddress FAILED" );
 723         goto error;
 724     }
 725
 726     /* Get DirectSoundEnumerate */
 727     OurDirectSoundEnumerate = (void *)
 728        GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 729                        "DirectSoundEnumerateA" );
 730     if( OurDirectSoundEnumerate )
 731     {
 732         /* Attempt enumeration */
 733         if( FAILED( OurDirectSoundEnumerate( CallBackDirectSoundEnum,
 734                                              p_aout ) ) )
 735         {
 736             msg_Dbg( p_aout, "enumeration of DirectSound devices failed" );
 737         }
 738     }
 739
 740     /* Create the direct sound object */
 741     if FAILED( OurDirectSoundCreate( p_aout->output.p_sys->p_device_guid,
 742                                      &p_aout->output.p_sys->p_dsobject,
 743                                      NULL ) )
 744     {
 745         msg_Warn( p_aout, "cannot create a direct sound device" );
 746         goto error;
 747     }
 748
 749     /* Set DirectSound Cooperative level, ie what control we want over Windows
 750      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 751      * settings of the primary buffer, but also that only the sound of our
 752      * application will be hearable when it will have the focus.
 753      * !!! (this is not really working as intended yet because to set the
 754      * cooperative level you need the window handle of your application, and
 755      * I don't know of any easy way to get it. Especially since we might play
 756      * sound without any video, and so what window handle should we use ???
 757      * The hack for now is to use the Desktop window handle - it seems to be
 758      * working */
 759     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 760                                           GetDesktopWindow(),
 761                                           DSSCL_EXCLUSIVE) )
 762     {
 763         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 764     }
 765
 766     return VLC_SUCCESS;
 767
 768  error:
 769     p_aout->output.p_sys->p_dsobject = NULL;
 770     if( p_aout->output.p_sys->hdsound_dll )
 771     {
 772         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 773         p_aout->output.p_sys->hdsound_dll = NULL;
 774     }
 775     return VLC_EGENERIC;
 776
 777 }
 778
 779 /*****************************************************************************
 780  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 781  *****************************************************************************
 782  * This function creates the buffer we'll use to play audio.
 783  * In DirectSound there are two kinds of buffers:
 784  * - the primary buffer: which is the actual buffer that the soundcard plays
 785  * - the secondary buffer(s): these buffers are the one actually used by
 786  *    applications and DirectSound takes care of mixing them into the primary.
 787  *
 788  * Once you create a secondary buffer, you cannot change its format anymore so
 789  * you have to release the current one and create another.
 790  *****************************************************************************/
 791 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 792                            int i_channels, int i_nb_channels, int i_rate,
 793                            int i_bytes_per_frame, bool b_probe )
 794 {
 795     WAVEFORMATEXTENSIBLE waveformat;
 796     DSBUFFERDESC         dsbdesc;
 797     unsigned int         i;
 798
 799     /* First set the sound buffer format */
 800     waveformat.dwChannelMask = 0;
 801     for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
 802     {
 803         if( i_channels & pi_channels_src[i] )
 804             waveformat.dwChannelMask |= pi_channels_in[i];
 805     }
 806
 807     switch( i_format )
 808     {
 809     case VLC_FOURCC('s','p','d','i'):
 810         i_nb_channels = 2;
 811         /* To prevent channel re-ordering */
 812         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 813         waveformat.Format.wBitsPerSample = 16;
 814         waveformat.Samples.wValidBitsPerSample =
 815             waveformat.Format.wBitsPerSample;
 816         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 817         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 818         break;
 819
 820     case VLC_FOURCC('f','l','3','2'):
 821         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 822         waveformat.Samples.wValidBitsPerSample =
 823             waveformat.Format.wBitsPerSample;
 824         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 825         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 826         break;
 827
 828     case VLC_FOURCC('s','1','6','l'):
 829         waveformat.Format.wBitsPerSample = 16;
 830         waveformat.Samples.wValidBitsPerSample =
 831             waveformat.Format.wBitsPerSample;
 832         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 833         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 834         break;
 835     }
 836
 837     waveformat.Format.nChannels = i_nb_channels;
 838     waveformat.Format.nSamplesPerSec = i_rate;
 839     waveformat.Format.nBlockAlign =
 840         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 841     waveformat.Format.nAvgBytesPerSec =
 842         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 843
 844     p_aout->output.p_sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
 845     p_aout->output.p_sys->i_channels = i_nb_channels;
 846
 847     /* Then fill in the direct sound descriptor */
 848     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 849     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 850     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 851                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 852
 853     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 854     if( i_nb_channels <= 2 )
 855     {
 856         waveformat.Format.cbSize = 0;
 857     }
 858     else
 859     {
 860         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 861         waveformat.Format.cbSize =
 862             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 863
 864         /* Needed for 5.1 on emu101k */
 865         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 866     }
 867
 868     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 869     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 870
 871     if FAILED( IDirectSound_CreateSoundBuffer(
 872                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 873                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 874     {
 875         if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
 876         {
 877             /* Try without DSBCAPS_LOCHARDWARE */
 878             dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 879             if FAILED( IDirectSound_CreateSoundBuffer(
 880                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 881                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 882             {
 883                 return VLC_EGENERIC;
 884             }
 885             if( !b_probe )
 886                 msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
 887         }
 888         else
 889         {
 890             return VLC_EGENERIC;
 891         }
 892     }
 893
 894     /* Stop here if we were just probing */
 895     if( b_probe )
 896     {
 897         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 898         p_aout->output.p_sys->p_dsbuffer = NULL;
 899         return VLC_SUCCESS;
 900     }
 901
 902     p_aout->output.p_sys->i_frame_size = i_bytes_per_frame;
 903     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 904     p_aout->output.p_sys->b_chan_reorder =
 905         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
 906                                   waveformat.dwChannelMask, i_nb_channels,
 907                                   p_aout->output.p_sys->pi_chan_table );
 908
 909     if( p_aout->output.p_sys->b_chan_reorder )
 910     {
 911         msg_Dbg( p_aout, "channel reordering needed" );
 912     }
 913
 914     return VLC_SUCCESS;
 915 }
 916
 917 /*****************************************************************************
 918  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 919  *****************************************************************************
 920  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 921  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 922  ****************************************************************************/
 923 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 924                               int i_channels, int i_nb_channels, int i_rate,
 925                               bool b_probe )
 926 {
 927     vlc_value_t val;
 928
 929     var_Get( p_aout, "directx-audio-float32", &val );
 930
 931     /* Float32 audio samples are not supported for 5.1 output on the emu101k */
 932
 933     if( !val.b_bool || i_nb_channels > 2 ||
 934         CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
 935                         i_channels, i_nb_channels, i_rate,
 936                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 937         != VLC_SUCCESS )
 938     {
 939         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
 940                              i_channels, i_nb_channels, i_rate,
 941                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 942              != VLC_SUCCESS )
 943         {
 944             return VLC_EGENERIC;
 945         }
 946         else
 947         {
 948             *i_format = VLC_FOURCC('s','1','6','l');
 949             return VLC_SUCCESS;
 950         }
 951     }
 952     else
 953     {
 954         *i_format = VLC_FOURCC('f','l','3','2');
 955         return VLC_SUCCESS;
 956     }
 957 }
 958
 959 /*****************************************************************************
 960  * DestroyDSBuffer
 961  *****************************************************************************
 962  * This function destroys the secondary buffer.
 963  *****************************************************************************/
 964 static void DestroyDSBuffer( aout_instance_t *p_aout )
 965 {
 966     if( p_aout->output.p_sys->p_dsbuffer )
 967     {
 968         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 969         p_aout->output.p_sys->p_dsbuffer = NULL;
 970     }
 971 }
 972
 973 /*****************************************************************************
 974  * FillBuffer: Fill in one of the direct sound frame buffers.
 975  *****************************************************************************
 976  * Returns VLC_SUCCESS on success.
 977  *****************************************************************************/
 978 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 979                        aout_buffer_t *p_buffer )
 980 {
 981     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 982     aout_sys_t *p_sys = p_aout->output.p_sys;
 983     void *p_write_position, *p_wrap_around;
 984     long l_bytes1, l_bytes2;
 985     HRESULT dsresult;
 986
 987     /* Before copying anything, we have to lock the buffer */
 988     dsresult = IDirectSoundBuffer_Lock(
 989                 p_sys->p_dsbuffer,                              /* DS buffer */
 990                 i_frame * p_notif->i_frame_size,             /* Start offset */
 991                 p_notif->i_frame_size,                    /* Number of bytes */
 992                 &p_write_position,                  /* Address of lock start */
 993                 &l_bytes1,       /* Count of bytes locked before wrap around */
 994                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 995                 &l_bytes2,               /* Count of bytes after wrap around */
 996                 0 );                                                /* Flags */
 997     if( dsresult == DSERR_BUFFERLOST )
 998     {
 999         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
1000         dsresult = IDirectSoundBuffer_Lock(
1001                                p_sys->p_dsbuffer,
1002                                i_frame * p_notif->i_frame_size,
1003                                p_notif->i_frame_size,
1004                                &p_write_position,
1005                                &l_bytes1,
1006                                &p_wrap_around,
1007                                &l_bytes2,
1008                                0 );
1009     }
1010     if( dsresult != DS_OK )
1011     {
1012         msg_Warn( p_notif, "cannot lock buffer" );
1013         if( p_buffer ) aout_BufferFree( p_buffer );
1014         return VLC_EGENERIC;
1015     }
1016
1017     if( p_buffer == NULL )
1018     {
1019         memset( p_write_position, 0, l_bytes1 );
1020     }
1021     else
1022     {
1023         if( p_sys->b_chan_reorder )
1024         {
1025             /* Do the channel reordering here */
1026             aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_nb_bytes,
1027                                  p_sys->i_channels, p_sys->pi_chan_table,
1028                                  p_sys->i_bits_per_sample );
1029         }
1030
1031         vlc_memcpy( p_write_position, p_buffer->p_buffer, l_bytes1 );
1032         aout_BufferFree( p_buffer );
1033     }
1034
1035     /* Now the data has been copied, unlock the buffer */
1036     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
1037                                p_wrap_around, l_bytes2 );
1038
1039     p_notif->i_write_slot = (i_frame + 1) % FRAMES_NUM;
1040     return VLC_SUCCESS;
1041 }
1042
1043 /*****************************************************************************
1044  * DirectSoundThread: this thread will capture play notification events.
1045  *****************************************************************************
1046  * We use this thread to emulate a callback mechanism. The thread probes for
1047  * event notification and fills up the DS secondary buffer when needed.
1048  *****************************************************************************/
1049 static void* DirectSoundThread( vlc_object_t *p_this )
1050 {
1051     notification_thread_t *p_notif = (notification_thread_t*)p_this;
1052     aout_instance_t *p_aout = p_notif->p_aout;
1053     bool b_sleek;
1054     mtime_t last_time;
1055     HRESULT dsresult;
1056     long l_queued = 0;
1057     int canc = vlc_savecancel ();
1058
1059     /* We don't want any resampling when using S/PDIF output */
1060     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
1061
1062     msg_Dbg( p_notif, "DirectSoundThread ready" );
1063
1064     /* Wait here until Play() is called */
1065     WaitForSingleObject( p_notif->event, INFINITE );
1066
1067     if( vlc_object_alive (p_notif) )
1068     {
1069         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
1070
1071         /* start playing the buffer */
1072         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
1073                                         0,                         /* Unused */
1074                                         0,                         /* Unused */
1075                                         DSBPLAY_LOOPING );          /* Flags */
1076         if( dsresult == DSERR_BUFFERLOST )
1077         {
1078             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
1079             dsresult = IDirectSoundBuffer_Play(
1080                                             p_aout->output.p_sys->p_dsbuffer,
1081                                             0,                     /* Unused */
1082                                             0,                     /* Unused */
1083                                             DSBPLAY_LOOPING );      /* Flags */
1084         }
1085         if( dsresult != DS_OK )
1086         {
1087             msg_Err( p_aout, "cannot start playing buffer" );
1088         }
1089     }
1090     last_time = mdate();
1091
1092     while( vlc_object_alive (p_notif) )
1093     {
1094         long l_read, l_free_slots;
1095         mtime_t mtime = mdate();
1096         int i;
1097
1098         /*
1099          * Fill in as much audio data as we can in our circular buffer
1100          */
1101
1102         /* Find out current play position */
1103         if FAILED( IDirectSoundBuffer_GetCurrentPosition(
1104                    p_aout->output.p_sys->p_dsbuffer, &l_read, NULL ) )
1105         {
1106             msg_Err( p_aout, "GetCurrentPosition() failed!" );
1107             l_read = 0;
1108         }
1109
1110         /* Detect underruns */
1111         if( l_queued && mtime - last_time >
1112             INT64_C(1000000) * l_queued / p_aout->output.output.i_rate )
1113         {
1114             msg_Dbg( p_aout, "detected underrun!" );
1115         }
1116         last_time = mtime;
1117
1118         /* Try to fill in as many frame buffers as possible */
1119         l_read /= p_aout->output.output.i_bytes_per_frame;
1120         l_queued = p_notif->i_write_slot * FRAME_SIZE - l_read;
1121         if( l_queued < 0 ) l_queued += (FRAME_SIZE * FRAMES_NUM);
1122         l_free_slots = (FRAMES_NUM * FRAME_SIZE - l_queued) / FRAME_SIZE;
1123
1124         for( i = 0; i < l_free_slots; i++ )
1125         {
1126             aout_buffer_t *p_buffer = aout_OutputNextBuffer( p_aout,
1127                 mtime + INT64_C(1000000) * (i * FRAME_SIZE + l_queued) /
1128                 p_aout->output.output.i_rate, b_sleek );
1129
1130             /* If there is no audio data available and we have some buffered
1131              * already, then just wait for the next time */
1132             if( !p_buffer && (i || l_queued / FRAME_SIZE) ) break;
1133
1134             if( FillBuffer( p_aout, p_notif->i_write_slot % FRAMES_NUM,
1135                             p_buffer ) != VLC_SUCCESS ) break;
1136         }
1137
1138         /* Sleep a reasonable amount of time */
1139         l_queued += (i * FRAME_SIZE);
1140         msleep( INT64_C(1000000) * l_queued / p_aout->output.output.i_rate / 2 );
1141     }
1142
1143     /* make sure the buffer isn't playing */
1144     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1145
1146     /* free the event */
1147     CloseHandle( p_notif->event );
1148
1149     vlc_restorecancel (canc);
1150     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1151     return NULL;
1152 }