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 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_aout.h>
  35
  36 #include <windows.h>
  37 #include <mmsystem.h>
  38 #include <dsound.h>
  39
  40 #define FRAME_SIZE ((int)p_aout->output.output.i_rate/20) /* Size in samples */
  41 #define FRAMES_NUM 8                                      /* Needs to be > 3 */
  42
  43 /*****************************************************************************
  44  * DirectSound GUIDs.
  45  * Defining them here allows us to get rid of the dxguid library during
  46  * the linking stage.
  47  *****************************************************************************/
  48 #include <initguid.h>
  49
  50 /*****************************************************************************
  51  * Useful macros
  52  *****************************************************************************/
  53 #ifndef WAVE_FORMAT_IEEE_FLOAT
  54 #   define WAVE_FORMAT_IEEE_FLOAT 0x0003
  55 #endif
  56
  57 #ifndef WAVE_FORMAT_DOLBY_AC3_SPDIF
  58 #   define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
  59 #endif
  60
  61 #ifndef WAVE_FORMAT_EXTENSIBLE
  62 #define  WAVE_FORMAT_EXTENSIBLE   0xFFFE
  63 #endif
  64
  65 #ifndef SPEAKER_FRONT_LEFT
  66 #   define SPEAKER_FRONT_LEFT             0x1
  67 #   define SPEAKER_FRONT_RIGHT            0x2
  68 #   define SPEAKER_FRONT_CENTER           0x4
  69 #   define SPEAKER_LOW_FREQUENCY          0x8
  70 #   define SPEAKER_BACK_LEFT              0x10
  71 #   define SPEAKER_BACK_RIGHT             0x20
  72 #   define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
  73 #   define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
  74 #   define SPEAKER_BACK_CENTER            0x100
  75 #   define SPEAKER_SIDE_LEFT              0x200
  76 #   define SPEAKER_SIDE_RIGHT             0x400
  77 #   define SPEAKER_TOP_CENTER             0x800
  78 #   define SPEAKER_TOP_FRONT_LEFT         0x1000
  79 #   define SPEAKER_TOP_FRONT_CENTER       0x2000
  80 #   define SPEAKER_TOP_FRONT_RIGHT        0x4000
  81 #   define SPEAKER_TOP_BACK_LEFT          0x8000
  82 #   define SPEAKER_TOP_BACK_CENTER        0x10000
  83 #   define SPEAKER_TOP_BACK_RIGHT         0x20000
  84 #   define SPEAKER_RESERVED               0x80000000
  85 #endif
  86
  87 #ifndef DSSPEAKER_DSSPEAKER_DIRECTOUT
  88 #   define DSSPEAKER_DSSPEAKER_DIRECTOUT         0x00000000
  89 #endif
  90 #ifndef DSSPEAKER_HEADPHONE
  91 #   define DSSPEAKER_HEADPHONE         0x00000001
  92 #endif
  93 #ifndef DSSPEAKER_MONO
  94 #   define DSSPEAKER_MONO              0x00000002
  95 #endif
  96 #ifndef DSSPEAKER_QUAD
  97 #   define DSSPEAKER_QUAD              0x00000003
  98 #endif
  99 #ifndef DSSPEAKER_STEREO
 100 #   define DSSPEAKER_STEREO            0x00000004
 101 #endif
 102 #ifndef DSSPEAKER_SURROUND
 103 #   define DSSPEAKER_SURROUND          0x00000005
 104 #endif
 105 #ifndef DSSPEAKER_5POINT1
 106 #   define DSSPEAKER_5POINT1           0x00000006
 107 #endif
 108 #ifndef DSSPEAKER_7POINT1
 109 #   define DSSPEAKER_7POINT1           0x00000007
 110 #endif
 111 #ifndef DSSPEAKER_7POINT1_SURROUND
 112 #   define DSSPEAKER_7POINT1_SURROUND           0x00000008
 113 #endif
 114 #ifndef DSSPEAKER_7POINT1_WIDE
 115 #   define DSSPEAKER_7POINT1_WIDE           DSSPEAKER_7POINT1
 116 #endif
 117
 118 #ifndef _WAVEFORMATEXTENSIBLE_
 119 typedef struct {
 120     WAVEFORMATEX    Format;
 121     union {
 122         WORD wValidBitsPerSample;       /* bits of precision  */
 123         WORD wSamplesPerBlock;          /* valid if wBitsPerSample==0 */
 124         WORD wReserved;                 /* If neither applies, set to zero. */
 125     } Samples;
 126     DWORD           dwChannelMask;      /* which channels are */
 127                                         /* present in stream  */
 128     GUID            SubFormat;
 129 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
 130 #endif
 131
 132 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, WAVE_FORMAT_IEEE_FLOAT, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 133 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_PCM, WAVE_FORMAT_PCM, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 134 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF, WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 135
 136 /*****************************************************************************
 137  * notification_thread_t: DirectX event thread
 138  *****************************************************************************/
 139 typedef struct notification_thread_t
 140 {
 141     VLC_COMMON_MEMBERS
 142
 143     aout_instance_t *p_aout;
 144     int i_frame_size;                          /* size in bytes of one frame */
 145     int i_write_slot;       /* current write position in our circular buffer */
 146
 147     mtime_t start_date;
 148     HANDLE event;
 149
 150 } notification_thread_t;
 151
 152 /*****************************************************************************
 153  * aout_sys_t: directx audio output method descriptor
 154  *****************************************************************************
 155  * This structure is part of the audio output thread descriptor.
 156  * It describes the direct sound specific properties of an audio device.
 157  *****************************************************************************/
 158 struct aout_sys_t
 159 {
 160     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
 161
 162     int                 i_device_id;                 /*  user defined device */
 163     LPGUID              p_device_guid;
 164
 165     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
 166     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
 167                                        * takes care of mixing all the
 168                                        * secondary buffers into the primary) */
 169
 170     notification_thread_t *p_notif;                  /* DirectSoundThread id */
 171
 172     int b_playing;                                         /* playing status */
 173
 174     int i_frame_size;                         /* Size in bytes of one frame */
 175
 176     int i_speaker_setup;                 /* Speaker setup override */
 177
 178     bool b_chan_reorder;              /* do we need channel reordering */
 179     int pi_chan_table[AOUT_CHAN_MAX];
 180     uint32_t i_channel_mask;
 181     uint32_t i_bits_per_sample;
 182     uint32_t i_channels;
 183 };
 184
 185 static const uint32_t pi_channels_src[] =
 186     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 187       AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT,
 188       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT, AOUT_CHAN_REARCENTER,
 189       AOUT_CHAN_CENTER, AOUT_CHAN_LFE, 0 };
 190 static const uint32_t pi_channels_in[] =
 191     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 192       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT,
 193       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT, SPEAKER_BACK_CENTER,
 194       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY, 0 };
 195 static const uint32_t pi_channels_out[] =
 196     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 197       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY,
 198       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 199       SPEAKER_BACK_CENTER,
 200       SPEAKER_SIDE_LEFT, SPEAKER_SIDE_RIGHT, 0 };
 201
 202 /*****************************************************************************
 203  * Local prototypes.
 204  *****************************************************************************/
 205 static int  OpenAudio  ( vlc_object_t * );
 206 static void CloseAudio ( vlc_object_t * );
 207 static void Play       ( aout_instance_t * );
 208
 209 /* local functions */
 210 static void Probe             ( aout_instance_t * );
 211 static int  InitDirectSound   ( aout_instance_t * );
 212 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, bool );
 213 static int  CreateDSBufferPCM ( aout_instance_t *, int*, int, int, int, bool );
 214 static void DestroyDSBuffer   ( aout_instance_t * );
 215 static void* DirectSoundThread( vlc_object_t * );
 216 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 217
 218 /* Speaker setup override options list */
 219 static const char *const speaker_list[] = { "Windows default", "Mono", "Stereo",
 220                                             "Quad", "5.1", "7.1" };
 221
 222 /*****************************************************************************
 223  * Module descriptor
 224  *****************************************************************************/
 225 #define DEVICE_TEXT N_("Output device")
 226 #define DEVICE_LONGTEXT N_( \
 227     "DirectX device number: 0 default device, 1..N device by number" \
 228     "(Note that the default device appears as 0 AND another number)." )
 229 #define FLOAT_TEXT N_("Use float32 output")
 230 #define FLOAT_LONGTEXT N_( \
 231     "The option allows you to enable or disable the high-quality float32 " \
 232     "audio output mode (which is not well supported by some soundcards)." )
 233 #define SPEAKER_TEXT N_("Select speaker configuration")
 234 #define SPEAKER_LONGTEXT N_("Select speaker configuration you want to use. " \
 235     "This option doesn't upmix! So NO e.g. Stereo -> 5.1 conversion." )
 236
 237 vlc_module_begin ()
 238     set_description( N_("DirectX audio output") )
 239     set_shortname( "DirectX" )
 240     set_capability( "audio output", 100 )
 241     set_category( CAT_AUDIO )
 242     set_subcategory( SUBCAT_AUDIO_AOUT )
 243     add_shortcut( "directx" )
 244     add_integer( "directx-audio-device", 0, NULL, DEVICE_TEXT,
 245                  DEVICE_LONGTEXT, true )
 246     add_bool( "directx-audio-float32", 0, 0, FLOAT_TEXT,
 247               FLOAT_LONGTEXT, true )
 248     add_string( "directx-audio-speaker", "Windows default", NULL,
 249                  SPEAKER_TEXT, SPEAKER_LONGTEXT, true )
 250         change_string_list( speaker_list, 0, 0 )
 251         change_need_restart ()
 252     set_callbacks( OpenAudio, CloseAudio )
 253 vlc_module_end ()
 254
 255 /*****************************************************************************
 256  * OpenAudio: open the audio device
 257  *****************************************************************************
 258  * This function opens and setups Direct Sound.
 259  *****************************************************************************/
 260 static int OpenAudio( vlc_object_t *p_this )
 261 {
 262     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 263     vlc_value_t val;
 264     char * psz_speaker;
 265     int i = 0;
 266
 267     const char * const * ppsz_compare = speaker_list;
 268
 269     msg_Dbg( p_aout, "OpenAudio" );
 270
 271    /* Allocate structure */
 272     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 273     if( p_aout->output.p_sys == NULL )
 274         return VLC_ENOMEM;
 275
 276     /* Initialize some variables */
 277     p_aout->output.p_sys->p_dsobject = NULL;
 278     p_aout->output.p_sys->p_dsbuffer = NULL;
 279     p_aout->output.p_sys->p_notif = NULL;
 280     p_aout->output.p_sys->b_playing = 0;
 281
 282     p_aout->output.pf_play = Play;
 283     aout_VolumeSoftInit( p_aout );
 284
 285     /* Retrieve config values */
 286     var_Create( p_aout, "directx-audio-float32",
 287                 VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
 288
 289     var_Create( p_aout, "directx-audio-speaker",
 290                 VLC_VAR_STRING | VLC_VAR_DOINHERIT );
 291     var_Get( p_this, "directx-audio-speaker", &val );
 292     psz_speaker = val.psz_string;
 293
 294     while ( *ppsz_compare != NULL )
 295     {
 296         if ( !strncmp( *ppsz_compare, psz_speaker, strlen(*ppsz_compare) ) )
 297         {
 298             break;
 299         }
 300         ppsz_compare++; i++;
 301     }
 302
 303     if ( *ppsz_compare == NULL )
 304     {
 305         msg_Err( p_aout, "(%s) isn't valid speaker setup option",
 306                  psz_speaker );
 307         msg_Err( p_aout, "Defaulting to Windows default speaker config");
 308         i = 0;
 309     }
 310     p_aout->output.p_sys->i_speaker_setup = i;
 311
 312     var_Create( p_aout, "directx-audio-device",
 313                 VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
 314     var_Get( p_aout, "directx-audio-device", &val );
 315     p_aout->output.p_sys->i_device_id = val.i_int;
 316     p_aout->output.p_sys->p_device_guid = 0;
 317
 318     /* Initialise DirectSound */
 319     if( InitDirectSound( p_aout ) )
 320     {
 321         msg_Err( p_aout, "cannot initialize DirectSound" );
 322         goto error;
 323     }
 324
 325     if( var_Type( p_aout, "audio-device" ) == 0 )
 326     {
 327         Probe( p_aout );
 328     }
 329
 330     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 331     {
 332         /* Probe() has failed. */
 333         goto error;
 334     }
 335
 336     /* Open the device */
 337     if( val.i_int == AOUT_VAR_SPDIF )
 338     {
 339         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 340
 341         /* Calculate the frame size in bytes */
 342         p_aout->output.i_nb_samples = A52_FRAME_NB;
 343         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 344         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 345         p_aout->output.p_sys->i_frame_size =
 346             p_aout->output.output.i_bytes_per_frame;
 347
 348         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 349                             p_aout->output.output.i_physical_channels,
 350                             aout_FormatNbChannels( &p_aout->output.output ),
 351                             p_aout->output.output.i_rate,
 352                             p_aout->output.p_sys->i_frame_size, false )
 353             != VLC_SUCCESS )
 354         {
 355             msg_Err( p_aout, "cannot open directx audio device" );
 356             free( p_aout->output.p_sys );
 357             return VLC_EGENERIC;
 358         }
 359
 360         aout_VolumeNoneInit( p_aout );
 361     }
 362     else
 363     {
 364         if( val.i_int == AOUT_VAR_5_1 )
 365         {
 366             p_aout->output.output.i_physical_channels
 367                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 368                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 369                    | AOUT_CHAN_LFE;
 370         }
 371         else if( val.i_int == AOUT_VAR_7_1 )
 372         {
 373                     p_aout->output.output.i_physical_channels
 374                         = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 375                            | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 376                            | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
 377                            | AOUT_CHAN_LFE;
 378         }
 379         else if( val.i_int == AOUT_VAR_3F2R )
 380         {
 381             p_aout->output.output.i_physical_channels
 382                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 383                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 384         }
 385         else if( val.i_int == AOUT_VAR_2F2R )
 386         {
 387             p_aout->output.output.i_physical_channels
 388                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 389                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 390         }
 391         else if( val.i_int == AOUT_VAR_MONO )
 392         {
 393             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 394         }
 395         else
 396         {
 397             p_aout->output.output.i_physical_channels
 398                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 399         }
 400
 401         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 402                                p_aout->output.output.i_physical_channels,
 403                                aout_FormatNbChannels( &p_aout->output.output ),
 404                                p_aout->output.output.i_rate, false )
 405             != VLC_SUCCESS )
 406         {
 407             msg_Err( p_aout, "cannot open directx audio device" );
 408             free( p_aout->output.p_sys );
 409             return VLC_EGENERIC;
 410         }
 411
 412         /* Calculate the frame size in bytes */
 413         p_aout->output.i_nb_samples = FRAME_SIZE;
 414         aout_FormatPrepare( &p_aout->output.output );
 415         aout_VolumeSoftInit( p_aout );
 416     }
 417
 418     /* Now we need to setup our DirectSound play notification structure */
 419     p_aout->output.p_sys->p_notif =
 420         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 421     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 422
 423     p_aout->output.p_sys->p_notif->event = CreateEvent( 0, FALSE, FALSE, 0 );
 424     p_aout->output.p_sys->p_notif->i_frame_size =
 425         p_aout->output.p_sys->i_frame_size;
 426
 427     /* then launch the notification thread */
 428     msg_Dbg( p_aout, "creating DirectSoundThread" );
 429     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 430                            "DirectSound Notification Thread",
 431                            DirectSoundThread,
 432                            VLC_THREAD_PRIORITY_HIGHEST ) )
 433     {
 434         msg_Err( p_aout, "cannot create DirectSoundThread" );
 435         CloseHandle( p_aout->output.p_sys->p_notif->event );
 436         vlc_object_release( p_aout->output.p_sys->p_notif );
 437         p_aout->output.p_sys->p_notif = NULL;
 438         goto error;
 439     }
 440
 441     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 442
 443     return VLC_SUCCESS;
 444
 445  error:
 446     CloseAudio( VLC_OBJECT(p_aout) );
 447     return VLC_EGENERIC;
 448 }
 449
 450 /*****************************************************************************
 451  * Probe: probe the audio device for available formats and channels
 452  *****************************************************************************/
 453 static void Probe( aout_instance_t * p_aout )
 454 {
 455     vlc_value_t val, text;
 456     int i_format;
 457     unsigned int i_physical_channels;
 458     DWORD ui_speaker_config;
 459     bool is_default_output_set = false;
 460
 461     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 462     text.psz_string = _("Audio Device");
 463     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 464
 465     /* Test for 5.1 support */
 466     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 467                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 468                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 469     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 470     {
 471         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 472                                p_aout->output.output.i_rate, true )
 473             == VLC_SUCCESS )
 474         {
 475             val.i_int = AOUT_VAR_5_1;
 476             text.psz_string = (char*) "5.1";
 477             var_Change( p_aout, "audio-device",
 478                         VLC_VAR_ADDCHOICE, &val, &text );
 479             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 480             is_default_output_set = true;
 481             msg_Dbg( p_aout, "device supports 5.1 channels" );
 482         }
 483     }
 484
 485     /* Test for 7.1 support */
 486     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 487                              AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 488                              AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT |
 489                              AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 490        if( p_aout->output.output.i_physical_channels == i_physical_channels )
 491        {
 492            if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 8,
 493                                   p_aout->output.output.i_rate, true )
 494                == VLC_SUCCESS )
 495            {
 496                val.i_int = AOUT_VAR_7_1;
 497                text.psz_string = (char*) "7.1";
 498                var_Change( p_aout, "audio-device",
 499                            VLC_VAR_ADDCHOICE, &val, &text );
 500                var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 501                is_default_output_set = true;
 502                msg_Dbg( p_aout, "device supports 7.1 channels" );
 503            }
 504        }
 505
 506     /* Test for 3 Front 2 Rear support */
 507     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 508                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 509                           AOUT_CHAN_REARRIGHT;
 510     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 511     {
 512         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 5,
 513                                p_aout->output.output.i_rate, true )
 514             == VLC_SUCCESS )
 515         {
 516             val.i_int = AOUT_VAR_3F2R;
 517             text.psz_string = _("3 Front 2 Rear");
 518             var_Change( p_aout, "audio-device",
 519                         VLC_VAR_ADDCHOICE, &val, &text );
 520             if(!is_default_output_set)
 521             {
 522                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 523                 is_default_output_set = true;
 524             }
 525             msg_Dbg( p_aout, "device supports 5 channels" );
 526         }
 527     }
 528
 529     /* Test for 2 Front 2 Rear support */
 530     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 531                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 532     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 533         == i_physical_channels )
 534     {
 535         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 536                                p_aout->output.output.i_rate, true )
 537             == VLC_SUCCESS )
 538         {
 539             val.i_int = AOUT_VAR_2F2R;
 540             text.psz_string = _("2 Front 2 Rear");
 541             var_Change( p_aout, "audio-device",
 542                         VLC_VAR_ADDCHOICE, &val, &text );
 543             if(!is_default_output_set)
 544             {
 545                 var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 546                 is_default_output_set = true;
 547             }
 548             msg_Dbg( p_aout, "device supports 4 channels" );
 549         }
 550     }
 551
 552     /* Test for stereo support */
 553     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 554     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 555                            p_aout->output.output.i_rate, true )
 556         == VLC_SUCCESS )
 557     {
 558         val.i_int = AOUT_VAR_STEREO;
 559         text.psz_string = _("Stereo");
 560         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 561         if(!is_default_output_set)
 562         {
 563             var_Change( p_aout, "audio-device", VLC_VAR_SETDEFAULT, &val, NULL );
 564             is_default_output_set = true;
 565             msg_Dbg( p_aout, "device supports 2 channels (DEFAULT!)" );
 566         }
 567         else msg_Dbg( p_aout, "device supports 2 channels" );
 568     }
 569
 570     /* Test for mono support */
 571     i_physical_channels = AOUT_CHAN_CENTER;
 572     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 573                            p_aout->output.output.i_rate, true )
 574         == VLC_SUCCESS )
 575     {
 576         val.i_int = AOUT_VAR_MONO;
 577         text.psz_string = _("Mono");
 578         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 579         msg_Dbg( p_aout, "device supports 1 channel" );
 580     }
 581
 582     /* Check the speaker configuration to determine which channel config should
 583      * be the default */
 584     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 585                                               &ui_speaker_config ) )
 586     {
 587         ui_speaker_config = DSSPEAKER_STEREO;
 588         msg_Dbg( p_aout, "GetSpeakerConfig failed" );
 589     }
 590     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 591     {
 592     case DSSPEAKER_7POINT1:
 593         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 7.1" );
 594         val.i_int = AOUT_VAR_7_1;
 595         break;
 596     case DSSPEAKER_5POINT1:
 597         msg_Dbg( p_aout, "Windows says your SpeakerConfig is 5.1" );
 598         val.i_int = AOUT_VAR_5_1;
 599         break;
 600     case DSSPEAKER_QUAD:
 601         msg_Dbg( p_aout, "Windows says your SpeakerConfig is Quad" );
 602         val.i_int = AOUT_VAR_2F2R;
 603         break;
 604 #if 0 /* Lots of people just get their settings wrong and complain that
 605        * this is a problem with VLC so just don't ever set mono by default. */
 606     case DSSPEAKER_MONO:
 607         val.i_int = AOUT_VAR_MONO;
 608         break;
 609 #endif
 610     case DSSPEAKER_SURROUND:
 611         msg_Dbg( p_aout, "Windows says your SpeakerConfig is surround" );
 612     case DSSPEAKER_STEREO:
 613         msg_Dbg( p_aout, "Windows says your SpeakerConfig is stereo" );
 614     default:
 615         /* If nothing else is found, choose stereo output */
 616         val.i_int = AOUT_VAR_STEREO;
 617         break;
 618     }
 619
 620     /* Check if we want to override speaker config */
 621     switch( p_aout->output.p_sys->i_speaker_setup )
 622     {
 623     case 0: /* Default value aka Windows default speaker setup */
 624         break;
 625     case 1: /* Mono */
 626         msg_Dbg( p_aout, "SpeakerConfig is forced to Mono" );
 627         val.i_int = AOUT_VAR_MONO;
 628         break;
 629     case 2: /* Stereo */
 630         msg_Dbg( p_aout, "SpeakerConfig is forced to Stereo" );
 631         val.i_int = AOUT_VAR_STEREO;
 632         break;
 633     case 3: /* Quad */
 634         msg_Dbg( p_aout, "SpeakerConfig is forced to Quad" );
 635         val.i_int = AOUT_VAR_2F2R;
 636         break;
 637     case 4: /* 5.1 */
 638         msg_Dbg( p_aout, "SpeakerConfig is forced to 5.1" );
 639         val.i_int = AOUT_VAR_5_1;
 640         break;
 641     case 5: /* 7.1 */
 642         msg_Dbg( p_aout, "SpeakerConfig is forced to 7.1" );
 643         val.i_int = AOUT_VAR_7_1;
 644         break;
 645     default:
 646         msg_Dbg( p_aout, "SpeakerConfig is forced to non-existing value" );
 647         break;
 648     }
 649
 650     var_Set( p_aout, "audio-device", val );
 651
 652     /* Test for SPDIF support */
 653     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 654     {
 655         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 656                             p_aout->output.output.i_physical_channels,
 657                             aout_FormatNbChannels( &p_aout->output.output ),
 658                             p_aout->output.output.i_rate,
 659                             AOUT_SPDIF_SIZE, true )
 660             == VLC_SUCCESS )
 661         {
 662             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 663             val.i_int = AOUT_VAR_SPDIF;
 664             text.psz_string = _("A/52 over S/PDIF");
 665             var_Change( p_aout, "audio-device",
 666                         VLC_VAR_ADDCHOICE, &val, &text );
 667             if( config_GetInt( p_aout, "spdif" ) )
 668                 var_Set( p_aout, "audio-device", val );
 669         }
 670     }
 671
 672     var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
 673     if( val.i_int <= 0 )
 674     {
 675         /* Probe() has failed. */
 676         var_Destroy( p_aout, "audio-device" );
 677         return;
 678     }
 679
 680     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 681
 682     val.b_bool = true;
 683     var_Set( p_aout, "intf-change", val );
 684 }
 685
 686 /*****************************************************************************
 687  * Play: we'll start playing the directsound buffer here because at least here
 688  *       we know the first buffer has been put in the aout fifo and we also
 689  *       know its date.
 690  *****************************************************************************/
 691 static void Play( aout_instance_t *p_aout )
 692 {
 693     if( !p_aout->output.p_sys->b_playing )
 694     {
 695         aout_buffer_t *p_buffer;
 696         int i;
 697
 698         p_aout->output.p_sys->b_playing = 1;
 699
 700         /* get the playing date of the first aout buffer */
 701         p_aout->output.p_sys->p_notif->start_date =
 702             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 703
 704         /* fill in the first samples */
 705         for( i = 0; i < FRAMES_NUM; i++ )
 706         {
 707             p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 708             if( !p_buffer ) break;
 709             FillBuffer( p_aout, i, p_buffer );
 710         }
 711
 712         /* wake up the audio output thread */
 713         SetEvent( p_aout->output.p_sys->p_notif->event );
 714     }
 715 }
 716
 717 /*****************************************************************************
 718  * CloseAudio: close the audio device
 719  *****************************************************************************/
 720 static void CloseAudio( vlc_object_t *p_this )
 721 {
 722     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 723     aout_sys_t *p_sys = p_aout->output.p_sys;
 724
 725     msg_Dbg( p_aout, "closing audio device" );
 726
 727     /* kill the position notification thread, if any */
 728     if( p_sys->p_notif )
 729     {
 730         vlc_object_detach( p_sys->p_notif );
 731         vlc_object_kill( p_sys->p_notif );
 732         /* wake up the audio thread if needed */
 733         if( !p_sys->b_playing ) SetEvent( p_sys->p_notif->event );
 734
 735         vlc_thread_join( p_sys->p_notif );
 736         vlc_object_release( p_sys->p_notif );
 737     }
 738
 739     /* release the secondary buffer */
 740     DestroyDSBuffer( p_aout );
 741
 742     /* finally release the DirectSound object */
 743     if( p_sys->p_dsobject ) IDirectSound_Release( p_sys->p_dsobject );
 744
 745     /* free DSOUND.DLL */
 746     if( p_sys->hdsound_dll ) FreeLibrary( p_sys->hdsound_dll );
 747
 748     free( p_aout->output.p_sys->p_device_guid );
 749     free( p_sys );
 750 }
 751
 752 /*****************************************************************************
 753  * CallBackDirectSoundEnum: callback to enumerate available devices
 754  *****************************************************************************/
 755 static int CALLBACK CallBackDirectSoundEnum( LPGUID p_guid, LPCSTR psz_desc,
 756                                              LPCSTR psz_mod, LPVOID _p_aout )
 757 {
 758     aout_instance_t *p_aout = (aout_instance_t *)_p_aout;
 759
 760     msg_Dbg( p_aout, "found device: %s", psz_desc );
 761
 762     if( p_aout->output.p_sys->i_device_id == 0 && p_guid )
 763     {
 764         p_aout->output.p_sys->p_device_guid = malloc( sizeof( GUID ) );
 765         *p_aout->output.p_sys->p_device_guid = *p_guid;
 766         msg_Dbg( p_aout, "using device: %s", psz_desc );
 767     }
 768
 769     p_aout->output.p_sys->i_device_id--;
 770     return 1;
 771 }
 772
 773 /*****************************************************************************
 774  * InitDirectSound: handle all the gory details of DirectSound initialisation
 775  *****************************************************************************/
 776 static int InitDirectSound( aout_instance_t *p_aout )
 777 {
 778     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 779     HRESULT (WINAPI *OurDirectSoundEnumerate)(LPDSENUMCALLBACK, LPVOID);
 780
 781     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 782     if( p_aout->output.p_sys->hdsound_dll == NULL )
 783     {
 784         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 785         goto error;
 786     }
 787
 788     OurDirectSoundCreate = (void *)
 789         GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 790                         "DirectSoundCreate" );
 791     if( OurDirectSoundCreate == NULL )
 792     {
 793         msg_Warn( p_aout, "GetProcAddress FAILED" );
 794         goto error;
 795     }
 796
 797     /* Get DirectSoundEnumerate */
 798     OurDirectSoundEnumerate = (void *)
 799        GetProcAddress( p_aout->output.p_sys->hdsound_dll,
 800                        "DirectSoundEnumerateA" );
 801     if( OurDirectSoundEnumerate )
 802     {
 803         /* Attempt enumeration */
 804         if( FAILED( OurDirectSoundEnumerate( CallBackDirectSoundEnum,
 805                                              p_aout ) ) )
 806         {
 807             msg_Dbg( p_aout, "enumeration of DirectSound devices failed" );
 808         }
 809     }
 810
 811     /* Create the direct sound object */
 812     if FAILED( OurDirectSoundCreate( p_aout->output.p_sys->p_device_guid,
 813                                      &p_aout->output.p_sys->p_dsobject,
 814                                      NULL ) )
 815     {
 816         msg_Warn( p_aout, "cannot create a direct sound device" );
 817         goto error;
 818     }
 819
 820     /* Set DirectSound Cooperative level, ie what control we want over Windows
 821      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 822      * settings of the primary buffer, but also that only the sound of our
 823      * application will be hearable when it will have the focus.
 824      * !!! (this is not really working as intended yet because to set the
 825      * cooperative level you need the window handle of your application, and
 826      * I don't know of any easy way to get it. Especially since we might play
 827      * sound without any video, and so what window handle should we use ???
 828      * The hack for now is to use the Desktop window handle - it seems to be
 829      * working */
 830     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 831                                           GetDesktopWindow(),
 832                                           DSSCL_EXCLUSIVE) )
 833     {
 834         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 835     }
 836
 837     return VLC_SUCCESS;
 838
 839  error:
 840     p_aout->output.p_sys->p_dsobject = NULL;
 841     if( p_aout->output.p_sys->hdsound_dll )
 842     {
 843         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 844         p_aout->output.p_sys->hdsound_dll = NULL;
 845     }
 846     return VLC_EGENERIC;
 847
 848 }
 849
 850 /*****************************************************************************
 851  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 852  *****************************************************************************
 853  * This function creates the buffer we'll use to play audio.
 854  * In DirectSound there are two kinds of buffers:
 855  * - the primary buffer: which is the actual buffer that the soundcard plays
 856  * - the secondary buffer(s): these buffers are the one actually used by
 857  *    applications and DirectSound takes care of mixing them into the primary.
 858  *
 859  * Once you create a secondary buffer, you cannot change its format anymore so
 860  * you have to release the current one and create another.
 861  *****************************************************************************/
 862 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 863                            int i_channels, int i_nb_channels, int i_rate,
 864                            int i_bytes_per_frame, bool b_probe )
 865 {
 866     WAVEFORMATEXTENSIBLE waveformat;
 867     DSBUFFERDESC         dsbdesc;
 868     unsigned int         i;
 869
 870     /* First set the sound buffer format */
 871     waveformat.dwChannelMask = 0;
 872     for( i = 0; i < sizeof(pi_channels_src)/sizeof(uint32_t); i++ )
 873     {
 874         if( i_channels & pi_channels_src[i] )
 875             waveformat.dwChannelMask |= pi_channels_in[i];
 876     }
 877
 878     switch( i_format )
 879     {
 880     case VLC_FOURCC('s','p','d','i'):
 881         i_nb_channels = 2;
 882         /* To prevent channel re-ordering */
 883         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 884         waveformat.Format.wBitsPerSample = 16;
 885         waveformat.Samples.wValidBitsPerSample =
 886             waveformat.Format.wBitsPerSample;
 887         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 888         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 889         break;
 890
 891     case VLC_FOURCC('f','l','3','2'):
 892         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 893         waveformat.Samples.wValidBitsPerSample =
 894             waveformat.Format.wBitsPerSample;
 895         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 896         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 897         break;
 898
 899     case VLC_FOURCC('s','1','6','l'):
 900         waveformat.Format.wBitsPerSample = 16;
 901         waveformat.Samples.wValidBitsPerSample =
 902             waveformat.Format.wBitsPerSample;
 903         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 904         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 905         break;
 906     }
 907
 908     waveformat.Format.nChannels = i_nb_channels;
 909     waveformat.Format.nSamplesPerSec = i_rate;
 910     waveformat.Format.nBlockAlign =
 911         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 912     waveformat.Format.nAvgBytesPerSec =
 913         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 914
 915     p_aout->output.p_sys->i_bits_per_sample = waveformat.Format.wBitsPerSample;
 916     p_aout->output.p_sys->i_channels = i_nb_channels;
 917
 918     /* Then fill in the direct sound descriptor */
 919     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 920     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 921     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 922                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 923
 924     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 925     if( i_nb_channels <= 2 )
 926     {
 927         waveformat.Format.cbSize = 0;
 928     }
 929     else
 930     {
 931         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 932         waveformat.Format.cbSize =
 933             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 934
 935         /* Needed for 5.1 on emu101k */
 936         dsbdesc.dwFlags |= DSBCAPS_LOCHARDWARE;
 937     }
 938
 939     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 940     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 941
 942     if FAILED( IDirectSound_CreateSoundBuffer(
 943                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 944                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 945     {
 946         if( dsbdesc.dwFlags & DSBCAPS_LOCHARDWARE )
 947         {
 948             /* Try without DSBCAPS_LOCHARDWARE */
 949             dsbdesc.dwFlags &= ~DSBCAPS_LOCHARDWARE;
 950             if FAILED( IDirectSound_CreateSoundBuffer(
 951                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 952                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 953             {
 954                 return VLC_EGENERIC;
 955             }
 956             if( !b_probe )
 957                 msg_Dbg( p_aout, "couldn't use hardware sound buffer" );
 958         }
 959         else
 960         {
 961             return VLC_EGENERIC;
 962         }
 963     }
 964
 965     /* Stop here if we were just probing */
 966     if( b_probe )
 967     {
 968         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 969         p_aout->output.p_sys->p_dsbuffer = NULL;
 970         return VLC_SUCCESS;
 971     }
 972
 973     p_aout->output.p_sys->i_frame_size = i_bytes_per_frame;
 974     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 975     p_aout->output.p_sys->b_chan_reorder =
 976         aout_CheckChannelReorder( pi_channels_in, pi_channels_out,
 977                                   waveformat.dwChannelMask, i_nb_channels,
 978                                   p_aout->output.p_sys->pi_chan_table );
 979
 980     if( p_aout->output.p_sys->b_chan_reorder )
 981     {
 982         msg_Dbg( p_aout, "channel reordering needed" );
 983     }
 984
 985     return VLC_SUCCESS;
 986 }
 987
 988 /*****************************************************************************
 989  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 990  *****************************************************************************
 991  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 992  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 993  ****************************************************************************/
 994 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 995                               int i_channels, int i_nb_channels, int i_rate,
 996                               bool b_probe )
 997 {
 998     vlc_value_t val;
 999
1000     var_Get( p_aout, "directx-audio-float32", &val );
1001
1002     /* Float32 audio samples are not supported for 5.1 output on the emu101k */
1003
1004     if( !val.b_bool || i_nb_channels > 2 ||
1005         CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
1006                         i_channels, i_nb_channels, i_rate,
1007                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
1008         != VLC_SUCCESS )
1009     {
1010         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
1011                              i_channels, i_nb_channels, i_rate,
1012                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
1013              != VLC_SUCCESS )
1014         {
1015             return VLC_EGENERIC;
1016         }
1017         else
1018         {
1019             *i_format = VLC_FOURCC('s','1','6','l');
1020             return VLC_SUCCESS;
1021         }
1022     }
1023     else
1024     {
1025         *i_format = VLC_FOURCC('f','l','3','2');
1026         return VLC_SUCCESS;
1027     }
1028 }
1029
1030 /*****************************************************************************
1031  * DestroyDSBuffer
1032  *****************************************************************************
1033  * This function destroys the secondary buffer.
1034  *****************************************************************************/
1035 static void DestroyDSBuffer( aout_instance_t *p_aout )
1036 {
1037     if( p_aout->output.p_sys->p_dsbuffer )
1038     {
1039         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
1040         p_aout->output.p_sys->p_dsbuffer = NULL;
1041     }
1042 }
1043
1044 /*****************************************************************************
1045  * FillBuffer: Fill in one of the direct sound frame buffers.
1046  *****************************************************************************
1047  * Returns VLC_SUCCESS on success.
1048  *****************************************************************************/
1049 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
1050                        aout_buffer_t *p_buffer )
1051 {
1052     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
1053     aout_sys_t *p_sys = p_aout->output.p_sys;
1054     void *p_write_position, *p_wrap_around;
1055     long l_bytes1, l_bytes2;
1056     HRESULT dsresult;
1057
1058     /* Before copying anything, we have to lock the buffer */
1059     dsresult = IDirectSoundBuffer_Lock(
1060                 p_sys->p_dsbuffer,                              /* DS buffer */
1061                 i_frame * p_notif->i_frame_size,             /* Start offset */
1062                 p_notif->i_frame_size,                    /* Number of bytes */
1063                 &p_write_position,                  /* Address of lock start */
1064                 &l_bytes1,       /* Count of bytes locked before wrap around */
1065                 &p_wrap_around,            /* Buffer adress (if wrap around) */
1066                 &l_bytes2,               /* Count of bytes after wrap around */
1067                 0 );                                                /* Flags */
1068     if( dsresult == DSERR_BUFFERLOST )
1069     {
1070         IDirectSoundBuffer_Restore( p_sys->p_dsbuffer );
1071         dsresult = IDirectSoundBuffer_Lock(
1072                                p_sys->p_dsbuffer,
1073                                i_frame * p_notif->i_frame_size,
1074                                p_notif->i_frame_size,
1075                                &p_write_position,
1076                                &l_bytes1,
1077                                &p_wrap_around,
1078                                &l_bytes2,
1079                                0 );
1080     }
1081     if( dsresult != DS_OK )
1082     {
1083         msg_Warn( p_notif, "cannot lock buffer" );
1084         if( p_buffer ) aout_BufferFree( p_buffer );
1085         return VLC_EGENERIC;
1086     }
1087
1088     if( p_buffer == NULL )
1089     {
1090         memset( p_write_position, 0, l_bytes1 );
1091     }
1092     else
1093     {
1094         if( p_sys->b_chan_reorder )
1095         {
1096             /* Do the channel reordering here */
1097             aout_ChannelReorder( p_buffer->p_buffer, p_buffer->i_nb_bytes,
1098                                  p_sys->i_channels, p_sys->pi_chan_table,
1099                                  p_sys->i_bits_per_sample );
1100         }
1101
1102         vlc_memcpy( p_write_position, p_buffer->p_buffer, l_bytes1 );
1103         aout_BufferFree( p_buffer );
1104     }
1105
1106     /* Now the data has been copied, unlock the buffer */
1107     IDirectSoundBuffer_Unlock( p_sys->p_dsbuffer, p_write_position, l_bytes1,
1108                                p_wrap_around, l_bytes2 );
1109
1110     p_notif->i_write_slot = (i_frame + 1) % FRAMES_NUM;
1111     return VLC_SUCCESS;
1112 }
1113
1114 /*****************************************************************************
1115  * DirectSoundThread: this thread will capture play notification events.
1116  *****************************************************************************
1117  * We use this thread to emulate a callback mechanism. The thread probes for
1118  * event notification and fills up the DS secondary buffer when needed.
1119  *****************************************************************************/
1120 static void* DirectSoundThread( vlc_object_t *p_this )
1121 {
1122     notification_thread_t *p_notif = (notification_thread_t*)p_this;
1123     aout_instance_t *p_aout = p_notif->p_aout;
1124     bool b_sleek;
1125     mtime_t last_time;
1126     HRESULT dsresult;
1127     long l_queued = 0;
1128     int canc = vlc_savecancel ();
1129
1130     /* We don't want any resampling when using S/PDIF output */
1131     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
1132
1133     msg_Dbg( p_notif, "DirectSoundThread ready" );
1134
1135     /* Wait here until Play() is called */
1136     WaitForSingleObject( p_notif->event, INFINITE );
1137
1138     if( vlc_object_alive (p_notif) )
1139     {
1140         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
1141
1142         /* start playing the buffer */
1143         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
1144                                         0,                         /* Unused */
1145                                         0,                         /* Unused */
1146                                         DSBPLAY_LOOPING );          /* Flags */
1147         if( dsresult == DSERR_BUFFERLOST )
1148         {
1149             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
1150             dsresult = IDirectSoundBuffer_Play(
1151                                             p_aout->output.p_sys->p_dsbuffer,
1152                                             0,                     /* Unused */
1153                                             0,                     /* Unused */
1154                                             DSBPLAY_LOOPING );      /* Flags */
1155         }
1156         if( dsresult != DS_OK )
1157         {
1158             msg_Err( p_aout, "cannot start playing buffer" );
1159         }
1160     }
1161     last_time = mdate();
1162
1163     while( vlc_object_alive (p_notif) )
1164     {
1165         long l_read, l_free_slots;
1166         mtime_t mtime = mdate();
1167         int i;
1168
1169         /*
1170          * Fill in as much audio data as we can in our circular buffer
1171          */
1172
1173         /* Find out current play position */
1174         if FAILED( IDirectSoundBuffer_GetCurrentPosition(
1175                    p_aout->output.p_sys->p_dsbuffer, &l_read, NULL ) )
1176         {
1177             msg_Err( p_aout, "GetCurrentPosition() failed!" );
1178             l_read = 0;
1179         }
1180
1181         /* Detect underruns */
1182         if( l_queued && mtime - last_time >
1183             INT64_C(1000000) * l_queued / p_aout->output.output.i_rate )
1184         {
1185             msg_Dbg( p_aout, "detected underrun!" );
1186         }
1187         last_time = mtime;
1188
1189         /* Try to fill in as many frame buffers as possible */
1190         l_read /= p_aout->output.output.i_bytes_per_frame;
1191         l_queued = p_notif->i_write_slot * FRAME_SIZE - l_read;
1192         if( l_queued < 0 ) l_queued += (FRAME_SIZE * FRAMES_NUM);
1193         l_free_slots = (FRAMES_NUM * FRAME_SIZE - l_queued) / FRAME_SIZE;
1194
1195         for( i = 0; i < l_free_slots; i++ )
1196         {
1197             aout_buffer_t *p_buffer = aout_OutputNextBuffer( p_aout,
1198                 mtime + INT64_C(1000000) * (i * FRAME_SIZE + l_queued) /
1199                 p_aout->output.output.i_rate, b_sleek );
1200
1201             /* If there is no audio data available and we have some buffered
1202              * already, then just wait for the next time */
1203             if( !p_buffer && (i || l_queued / FRAME_SIZE) ) break;
1204
1205             if( FillBuffer( p_aout, p_notif->i_write_slot % FRAMES_NUM,
1206                             p_buffer ) != VLC_SUCCESS ) break;
1207         }
1208
1209         /* Sleep a reasonable amount of time */
1210         l_queued += (i * FRAME_SIZE);
1211         msleep( INT64_C(1000000) * l_queued / p_aout->output.output.i_rate / 2 );
1212     }
1213
1214     /* make sure the buffer isn't playing */
1215     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1216
1217     /* free the event */
1218     CloseHandle( p_notif->event );
1219
1220     vlc_restorecancel (canc);
1221     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1222     return NULL;
1223 }