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

   1 /*****************************************************************************
   2  * directx.c: Windows DirectX audio output method
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: directx.c,v 1.15 2003/03/03 14:21:08 gbazin Exp $
   6  *
   7  * Authors: Gildas Bazin <gbazin@netcourrier.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include <errno.h>                                                 /* ENOMEM */
  28 #include <fcntl.h>                                       /* open(), O_WRONLY */
  29 #include <string.h>                                            /* strerror() */
  30
  31 #include <stdlib.h>                            /* calloc(), malloc(), free() */
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc/aout.h>
  35 #include "aout_internal.h"
  36
  37 #include <windows.h>
  38 #include <mmsystem.h>
  39 #include <dsound.h>
  40
  41 #define FRAME_SIZE 2048              /* The size is in samples, not in bytes */
  42 #define FRAMES_NUM 4
  43
  44 /* frame buffer status */
  45 #define FRAME_QUEUED 0
  46 #define FRAME_EMPTY 1
  47
  48 /*****************************************************************************
  49  * DirectSound GUIDs.
  50  * Defining them here allows us to get rid of the dxguid library during
  51  * the linking stage.
  52  *****************************************************************************/
  53 #include <initguid.h>
  54 DEFINE_GUID(IID_IDirectSoundNotify, 0xb0210783, 0x89cd, 0x11d0, 0xaf, 0x8, 0x0, 0xa0, 0xc9, 0x25, 0xcd, 0x16);
  55
  56 /*****************************************************************************
  57  * Useful macros
  58  *****************************************************************************/
  59 #ifndef WAVE_FORMAT_IEEE_FLOAT
  60 #   define WAVE_FORMAT_IEEE_FLOAT 0x0003
  61 #endif
  62
  63 #ifndef WAVE_FORMAT_DOLBY_AC3_SPDIF
  64 #   define WAVE_FORMAT_DOLBY_AC3_SPDIF 0x0092
  65 #endif
  66
  67 #ifndef WAVE_FORMAT_EXTENSIBLE
  68 #define  WAVE_FORMAT_EXTENSIBLE   0xFFFE
  69 #endif
  70
  71 #ifndef SPEAKER_FRONT_LEFT
  72 #   define SPEAKER_FRONT_LEFT             0x1
  73 #   define SPEAKER_FRONT_RIGHT            0x2
  74 #   define SPEAKER_FRONT_CENTER           0x4
  75 #   define SPEAKER_LOW_FREQUENCY          0x8
  76 #   define SPEAKER_BACK_LEFT              0x10
  77 #   define SPEAKER_BACK_RIGHT             0x20
  78 #   define SPEAKER_FRONT_LEFT_OF_CENTER   0x40
  79 #   define SPEAKER_FRONT_RIGHT_OF_CENTER  0x80
  80 #   define SPEAKER_BACK_CENTER            0x100
  81 #   define SPEAKER_SIDE_LEFT              0x200
  82 #   define SPEAKER_SIDE_RIGHT             0x400
  83 #   define SPEAKER_TOP_CENTER             0x800
  84 #   define SPEAKER_TOP_FRONT_LEFT         0x1000
  85 #   define SPEAKER_TOP_FRONT_CENTER       0x2000
  86 #   define SPEAKER_TOP_FRONT_RIGHT        0x4000
  87 #   define SPEAKER_TOP_BACK_LEFT          0x8000
  88 #   define SPEAKER_TOP_BACK_CENTER        0x10000
  89 #   define SPEAKER_TOP_BACK_RIGHT         0x20000
  90 #   define SPEAKER_RESERVED               0x80000000
  91 #endif
  92
  93 #ifndef DSSPEAKER_HEADPHONE
  94 #   define DSSPEAKER_HEADPHONE         0x00000001
  95 #endif
  96 #ifndef DSSPEAKER_MONO
  97 #   define DSSPEAKER_MONO              0x00000002
  98 #endif
  99 #ifndef DSSPEAKER_QUAD
 100 #   define DSSPEAKER_QUAD              0x00000003
 101 #endif
 102 #ifndef DSSPEAKER_STEREO
 103 #   define DSSPEAKER_STEREO            0x00000004
 104 #endif
 105 #ifndef DSSPEAKER_SURROUND
 106 #   define DSSPEAKER_SURROUND          0x00000005
 107 #endif
 108 #ifndef DSSPEAKER_5POINT1
 109 #   define DSSPEAKER_5POINT1           0x00000006
 110 #endif
 111
 112 #ifndef _WAVEFORMATEXTENSIBLE_
 113 typedef struct {
 114     WAVEFORMATEX    Format;
 115     union {
 116         WORD wValidBitsPerSample;       /* bits of precision  */
 117         WORD wSamplesPerBlock;          /* valid if wBitsPerSample==0 */
 118         WORD wReserved;                 /* If neither applies, set to zero. */
 119     } Samples;
 120     DWORD           dwChannelMask;      /* which channels are */
 121                                         /* present in stream  */
 122     GUID            SubFormat;
 123 } WAVEFORMATEXTENSIBLE, *PWAVEFORMATEXTENSIBLE;
 124 #endif
 125
 126 #ifndef KSDATAFORMAT_SUBTYPE_IEEE_FLOAT
 127 DEFINE_GUID( KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, WAVE_FORMAT_IEEE_FLOAT, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 128 #endif
 129 #ifndef KSDATAFORMAT_SUBTYPE_PCM
 130 DEFINE_GUID( KSDATAFORMAT_SUBTYPE_PCM, WAVE_FORMAT_PCM, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 131 #endif
 132 #ifndef KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF
 133 DEFINE_GUID( KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF, WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 134 #endif
 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_status[FRAMES_NUM];           /* status of each frame buffer */
 145     DSBPOSITIONNOTIFY p_events[FRAMES_NUM];      /* play notification events */
 146     int i_frame_size;                         /* Size in bytes of one frame */
 147
 148     mtime_t start_date;
 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     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
 162     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
 163                                        * takes care of mixing all the
 164                                        * secondary buffers into the primary) */
 165
 166     LPDIRECTSOUNDNOTIFY p_dsnotify;         /* the position notify interface */
 167     notification_thread_t *p_notif;                  /* DirectSoundThread id */
 168
 169     int b_playing;                                         /* playing status */
 170
 171     int i_frame_size;                         /* Size in bytes of one frame */
 172
 173     vlc_bool_t b_chan_reorder;              /* do we need channel reordering */
 174     int *pi_chan_table;
 175     uint32_t i_channel_mask;
 176 };
 177
 178 static const uint32_t pi_channels_in[] =
 179     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 180       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
 181       AOUT_CHAN_CENTER, AOUT_CHAN_LFE };
 182 static const uint32_t pi_channels_out[] =
 183     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 184       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 185       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY };
 186 static const uint32_t pi_channels_ordered[] =
 187     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT, SPEAKER_FRONT_CENTER,
 188       SPEAKER_LOW_FREQUENCY,
 189       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT };
 190
 191 /*****************************************************************************
 192  * Local prototypes.
 193  *****************************************************************************/
 194 static int  OpenAudio  ( vlc_object_t * );
 195 static void CloseAudio ( vlc_object_t * );
 196 static void Play       ( aout_instance_t * );
 197
 198 /* local functions */
 199 static void Probe             ( aout_instance_t * );
 200 static int  InitDirectSound   ( aout_instance_t * );
 201 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, vlc_bool_t );
 202 static int  CreateDSBufferPCM ( aout_instance_t *, int*, int, int, int, vlc_bool_t );
 203 static void DestroyDSBuffer   ( aout_instance_t * );
 204 static void DirectSoundThread ( notification_thread_t * );
 205 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 206
 207 static void CheckReordering   ( aout_instance_t *, int );
 208 static void InterleaveFloat32 ( float *, float *, int *, int );
 209 static void InterleaveS16     ( int16_t *, int16_t *, int *, int );
 210
 211 /*****************************************************************************
 212  * Module descriptor
 213  *****************************************************************************/
 214 vlc_module_begin();
 215     set_description( _("DirectX audio module") );
 216     set_capability( "audio output", 100 );
 217     add_shortcut( "directx" );
 218     set_callbacks( OpenAudio, CloseAudio );
 219 vlc_module_end();
 220
 221 /*****************************************************************************
 222  * OpenAudio: open the audio device
 223  *****************************************************************************
 224  * This function opens and setups Direct Sound.
 225  *****************************************************************************/
 226 static int OpenAudio( vlc_object_t *p_this )
 227 {
 228     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 229     vlc_value_t val;
 230     int i;
 231
 232     msg_Dbg( p_aout, "OpenAudio" );
 233
 234    /* Allocate structure */
 235     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 236     if( p_aout->output.p_sys == NULL )
 237     {
 238         msg_Err( p_aout, "out of memory" );
 239         return VLC_EGENERIC;
 240     }
 241
 242     /* Initialize some variables */
 243     p_aout->output.p_sys->p_dsobject = NULL;
 244     p_aout->output.p_sys->p_dsbuffer = NULL;
 245     p_aout->output.p_sys->p_dsnotify = NULL;
 246     p_aout->output.p_sys->p_notif = NULL;
 247     p_aout->output.p_sys->b_playing = 0;
 248     p_aout->output.p_sys->pi_chan_table = NULL;
 249
 250     p_aout->output.pf_play = Play;
 251     aout_VolumeSoftInit( p_aout );
 252
 253     /* Initialise DirectSound */
 254     if( InitDirectSound( p_aout ) )
 255     {
 256         msg_Err( p_aout, "cannot initialize DirectSound" );
 257         goto error;
 258     }
 259
 260     /* Now we need to setup our DirectSound play notification structure */
 261     p_aout->output.p_sys->p_notif =
 262         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 263     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 264
 265     if( var_Type( p_aout, "audio-device" ) == 0 )
 266     {
 267         Probe( p_aout );
 268     }
 269
 270     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 271     {
 272         /* Probe() has failed. */
 273         free( p_aout->output.p_sys );
 274         return VLC_EGENERIC;
 275     }
 276
 277     /* Then create the notification events */
 278     for( i = 0; i < FRAMES_NUM; i++ )
 279         p_aout->output.p_sys->p_notif->p_events[i].hEventNotify =
 280             CreateEvent( NULL, FALSE, FALSE, NULL );
 281
 282     /* Open the device */
 283     if( !strcmp( val.psz_string, N_("A/52 over S/PDIF") ) )
 284     {
 285         free( val.psz_string );
 286         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 287
 288         /* Calculate the frame size in bytes */
 289         p_aout->output.i_nb_samples = A52_FRAME_NB;
 290         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 291         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 292         p_aout->output.p_sys->i_frame_size =
 293             p_aout->output.output.i_bytes_per_frame;
 294
 295         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 296                             p_aout->output.output.i_physical_channels,
 297                             aout_FormatNbChannels( &p_aout->output.output ),
 298                             p_aout->output.output.i_rate,
 299                             p_aout->output.p_sys->i_frame_size, VLC_FALSE )
 300             != VLC_SUCCESS )
 301         {
 302             msg_Err( p_aout, "cannot open waveout audio device" );
 303             free( p_aout->output.p_sys );
 304             return VLC_EGENERIC;
 305         }
 306
 307         aout_VolumeNoneInit( p_aout );
 308     }
 309     else
 310     {
 311         if( !strcmp( val.psz_string, N_("5.1") ) )
 312         {
 313             p_aout->output.output.i_physical_channels
 314                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 315                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 316                    | AOUT_CHAN_LFE;
 317         }
 318         else if( !strcmp( val.psz_string, N_("2 Front 2 Rear") ) )
 319         {
 320             p_aout->output.output.i_physical_channels
 321                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 322                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 323         }
 324         else if( !strcmp( val.psz_string, "Mono" ) )
 325         {
 326             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 327         }
 328         else
 329         {
 330             p_aout->output.output.i_physical_channels
 331                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 332         }
 333         free( val.psz_string );
 334
 335         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 336                                p_aout->output.output.i_physical_channels,
 337                                aout_FormatNbChannels( &p_aout->output.output ),
 338                                p_aout->output.output.i_rate, VLC_FALSE )
 339             != VLC_SUCCESS )
 340         {
 341             msg_Err( p_aout, "cannot open waveout audio device" );
 342             free( p_aout->output.p_sys );
 343             return VLC_EGENERIC;
 344         }
 345
 346         /* Calculate the frame size in bytes */
 347         p_aout->output.i_nb_samples = FRAME_SIZE;
 348         aout_FormatPrepare( &p_aout->output.output );
 349         p_aout->output.p_sys->i_frame_size =
 350             FRAME_SIZE * p_aout->output.output.i_bytes_per_frame;
 351
 352         aout_VolumeSoftInit( p_aout );
 353     }
 354
 355     /* then launch the notification thread */
 356     msg_Dbg( p_aout, "creating DirectSoundThread" );
 357     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 358                            "DirectSound Notification Thread",
 359                            DirectSoundThread,
 360                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
 361     {
 362         msg_Err( p_aout, "cannot create DirectSoundThread" );
 363         goto error;
 364     }
 365
 366     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 367
 368     return VLC_SUCCESS;
 369
 370  error:
 371     CloseAudio( VLC_OBJECT(p_aout) );
 372     return VLC_EGENERIC;
 373 }
 374
 375 /*****************************************************************************
 376  * Probe: probe the audio device for available formats and channels
 377  *****************************************************************************/
 378 static void Probe( aout_instance_t * p_aout )
 379 {
 380     vlc_value_t val;
 381     int i_format;
 382     unsigned int i_physical_channels;
 383     DWORD ui_speaker_config;
 384
 385     var_Create( p_aout, "audio-device", VLC_VAR_STRING | VLC_VAR_HASCHOICE );
 386
 387     /* Test for 5.1 support */
 388     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 389                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 390                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 391     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 392     {
 393         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 394                                p_aout->output.output.i_rate, VLC_TRUE )
 395             == VLC_SUCCESS )
 396         {
 397             val.psz_string = N_("5.1");
 398             var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 399             msg_Dbg( p_aout, "device supports 5.1 channels" );
 400         }
 401     }
 402
 403     /* Test for 2 Front 2 Rear support */
 404     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 405                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 406     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 407         == i_physical_channels )
 408     {
 409         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 410                                p_aout->output.output.i_rate, VLC_TRUE )
 411             == VLC_SUCCESS )
 412         {
 413             val.psz_string = N_("2 Front 2 Rear");
 414             var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 415             msg_Dbg( p_aout, "device supports 4 channels" );
 416         }
 417     }
 418
 419     /* Test for stereo support */
 420     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 421     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 422                            p_aout->output.output.i_rate, VLC_TRUE )
 423         == VLC_SUCCESS )
 424     {
 425         val.psz_string = N_("Stereo");
 426         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 427         msg_Dbg( p_aout, "device supports 2 channels" );
 428     }
 429
 430     /* Test for mono support */
 431     i_physical_channels = AOUT_CHAN_CENTER;
 432     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 433                            p_aout->output.output.i_rate, VLC_TRUE )
 434         == VLC_SUCCESS )
 435     {
 436         val.psz_string = N_("Mono");
 437         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 438         msg_Dbg( p_aout, "device supports 1 channel" );
 439     }
 440
 441     /* Check the speaker configuration to determine which channel config should
 442      * be the default */
 443     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 444                                               &ui_speaker_config ) )
 445     {
 446         ui_speaker_config = DSSPEAKER_STEREO;
 447     }
 448     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 449     {
 450     case DSSPEAKER_5POINT1:
 451         val.psz_string = N_("5.1");
 452         break;
 453     case DSSPEAKER_QUAD:
 454         val.psz_string = N_("2 Front 2 Rear");
 455         break;
 456     case DSSPEAKER_MONO:
 457         val.psz_string = N_("Mono");
 458         break;
 459     case DSSPEAKER_SURROUND:
 460     case DSSPEAKER_STEREO:
 461     default:
 462         val.psz_string = N_("Stereo");
 463         break;
 464     }
 465     var_Set( p_aout, "audio-device", val );
 466
 467     /* Test for SPDIF support */
 468     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 469     {
 470         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 471                             p_aout->output.output.i_physical_channels,
 472                             aout_FormatNbChannels( &p_aout->output.output ),
 473                             p_aout->output.output.i_rate,
 474                             AOUT_SPDIF_SIZE, VLC_TRUE )
 475             == VLC_SUCCESS )
 476         {
 477             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 478             val.psz_string = N_("A/52 over S/PDIF");
 479             var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 480             if( config_GetInt( p_aout, "spdif" ) )
 481                 var_Set( p_aout, "audio-device", val );
 482         }
 483     }
 484
 485     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 486
 487     val.b_bool = VLC_TRUE;
 488     var_Set( p_aout, "intf-change", val );
 489 }
 490
 491 /*****************************************************************************
 492  * Play: we'll start playing the directsound buffer here because at least here
 493  *       we know the first buffer has been put in the aout fifo and we also
 494  *       know its date.
 495  *****************************************************************************/
 496 static void Play( aout_instance_t *p_aout )
 497 {
 498     if( !p_aout->output.p_sys->b_playing )
 499     {
 500         aout_buffer_t *p_buffer;
 501
 502         p_aout->output.p_sys->b_playing = 1;
 503
 504         /* get the playing date of the first aout buffer */
 505         p_aout->output.p_sys->p_notif->start_date =
 506             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 507
 508         /* fill in the first samples */
 509         p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 510         FillBuffer( p_aout, 0, p_buffer );
 511
 512         /* wake up the audio output thread */
 513         SetEvent( p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 514     }
 515 }
 516
 517 /*****************************************************************************
 518  * CloseAudio: close the audio device
 519  *****************************************************************************/
 520 static void CloseAudio( vlc_object_t *p_this )
 521 {
 522     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 523
 524     msg_Dbg( p_aout, "CloseAudio" );
 525
 526     /* kill the position notification thread, if any */
 527     if( p_aout->output.p_sys->p_notif )
 528     {
 529         vlc_object_detach( p_aout->output.p_sys->p_notif );
 530         if( p_aout->output.p_sys->p_notif->b_thread )
 531         {
 532             p_aout->output.p_sys->p_notif->b_die = 1;
 533
 534             if( !p_aout->output.p_sys->b_playing )
 535                 /* wake up the audio thread */
 536                 SetEvent(
 537                     p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 538
 539             vlc_thread_join( p_aout->output.p_sys->p_notif );
 540         }
 541         vlc_object_destroy( p_aout->output.p_sys->p_notif );
 542     }
 543
 544     /* release the secondary buffer */
 545     DestroyDSBuffer( p_aout );
 546
 547     /* finally release the DirectSound object */
 548     if( p_aout->output.p_sys->p_dsobject )
 549         IDirectSound_Release( p_aout->output.p_sys->p_dsobject );
 550
 551     /* free DSOUND.DLL */
 552     if( p_aout->output.p_sys->hdsound_dll )
 553        FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 554
 555     if( p_aout->output.p_sys->pi_chan_table )
 556         free( p_aout->output.p_sys->pi_chan_table );
 557
 558     free( p_aout->output.p_sys );
 559 }
 560
 561 /*****************************************************************************
 562  * InitDirectSound: handle all the gory details of DirectSound initialisation
 563  *****************************************************************************/
 564 static int InitDirectSound( aout_instance_t *p_aout )
 565 {
 566     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 567
 568     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 569     if( p_aout->output.p_sys->hdsound_dll == NULL )
 570     {
 571         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 572         goto error;
 573     }
 574
 575     OurDirectSoundCreate = (void *)GetProcAddress(
 576                                            p_aout->output.p_sys->hdsound_dll,
 577                                            "DirectSoundCreate" );
 578     if( OurDirectSoundCreate == NULL )
 579     {
 580         msg_Warn( p_aout, "GetProcAddress FAILED" );
 581         goto error;
 582     }
 583
 584     /* Create the direct sound object */
 585     if FAILED( OurDirectSoundCreate( NULL, &p_aout->output.p_sys->p_dsobject,
 586                                      NULL ) )
 587     {
 588         msg_Warn( p_aout, "cannot create a direct sound device" );
 589         goto error;
 590     }
 591
 592     /* Set DirectSound Cooperative level, ie what control we want over Windows
 593      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 594      * settings of the primary buffer, but also that only the sound of our
 595      * application will be hearable when it will have the focus.
 596      * !!! (this is not really working as intended yet because to set the
 597      * cooperative level you need the window handle of your application, and
 598      * I don't know of any easy way to get it. Especially since we might play
 599      * sound without any video, and so what window handle should we use ???
 600      * The hack for now is to use the Desktop window handle - it seems to be
 601      * working */
 602     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 603                                           GetDesktopWindow(),
 604                                           DSSCL_EXCLUSIVE) )
 605     {
 606         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 607     }
 608
 609     return VLC_SUCCESS;
 610
 611  error:
 612     p_aout->output.p_sys->p_dsobject = NULL;
 613     if( p_aout->output.p_sys->hdsound_dll )
 614     {
 615         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 616         p_aout->output.p_sys->hdsound_dll = NULL;
 617     }
 618     return VLC_EGENERIC;
 619
 620 }
 621
 622 /*****************************************************************************
 623  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 624  *****************************************************************************
 625  * This function creates the buffer we'll use to play audio.
 626  * In DirectSound there are two kinds of buffers:
 627  * - the primary buffer: which is the actual buffer that the soundcard plays
 628  * - the secondary buffer(s): these buffers are the one actually used by
 629  *    applications and DirectSound takes care of mixing them into the primary.
 630  *
 631  * Once you create a secondary buffer, you cannot change its format anymore so
 632  * you have to release the current one and create another.
 633  *****************************************************************************/
 634 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 635                            int i_channels, int i_nb_channels, int i_rate,
 636                            int i_bytes_per_frame, vlc_bool_t b_probe )
 637 {
 638     WAVEFORMATEXTENSIBLE waveformat;
 639     DSBUFFERDESC         dsbdesc;
 640     unsigned int         i;
 641
 642     /* First set the sound buffer format */
 643     waveformat.dwChannelMask = 0;
 644     for( i = 0; i < sizeof(pi_channels_in)/sizeof(uint32_t); i++ )
 645     {
 646         if( i_channels & pi_channels_in[i] )
 647             waveformat.dwChannelMask |= pi_channels_out[i];
 648     }
 649
 650     switch( i_format )
 651     {
 652     case VLC_FOURCC('s','p','d','i'):
 653         i_nb_channels = 2;
 654         /* To prevent channel re-ordering */
 655         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 656         waveformat.Format.wBitsPerSample = 16;
 657         waveformat.Samples.wValidBitsPerSample =
 658             waveformat.Format.wBitsPerSample;
 659         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 660         waveformat.SubFormat = KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 661         break;
 662
 663     case VLC_FOURCC('f','l','3','2'):
 664         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 665         waveformat.Samples.wValidBitsPerSample =
 666             waveformat.Format.wBitsPerSample;
 667         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 668         waveformat.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 669         break;
 670
 671     case VLC_FOURCC('s','1','6','l'):
 672         waveformat.Format.wBitsPerSample = 16;
 673         waveformat.Samples.wValidBitsPerSample =
 674             waveformat.Format.wBitsPerSample;
 675         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 676         waveformat.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
 677         break;
 678     }
 679
 680     waveformat.Format.nChannels = i_nb_channels;
 681     waveformat.Format.nSamplesPerSec = i_rate;
 682     waveformat.Format.nBlockAlign =
 683         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 684     waveformat.Format.nAvgBytesPerSec =
 685         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 686
 687     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 688     if( i_nb_channels <= 2 )
 689     {
 690         waveformat.Format.cbSize = 0;
 691     }
 692     else
 693     {
 694         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 695         waveformat.Format.cbSize =
 696             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 697     }
 698
 699
 700     /* Then fill in the direct sound descriptor */
 701     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 702     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 703     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 704                     | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
 705                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 706     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 707     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 708
 709     if FAILED( IDirectSound_CreateSoundBuffer(
 710                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 711                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 712     {
 713         goto error;
 714     }
 715
 716     /* Stop here if we were just probing */
 717     if( b_probe )
 718     {
 719         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 720         p_aout->output.p_sys->p_dsbuffer = NULL;
 721         return VLC_SUCCESS;
 722     }
 723
 724     /* Backup the size of a frame */
 725     p_aout->output.p_sys->p_notif->i_frame_size = i_bytes_per_frame;
 726
 727     /* Now the secondary buffer is created, we need to setup its position
 728      * notification */
 729     for( i = 0; i < FRAMES_NUM; i++ )
 730     {
 731         p_aout->output.p_sys->p_notif->p_events[i].dwOffset = i *
 732             p_aout->output.p_sys->p_notif->i_frame_size;
 733
 734         p_aout->output.p_sys->p_notif->i_frame_status[i] = FRAME_EMPTY;
 735     }
 736
 737     /* Get the IDirectSoundNotify interface */
 738     if FAILED( IDirectSoundBuffer_QueryInterface(
 739                                 p_aout->output.p_sys->p_dsbuffer,
 740                                 &IID_IDirectSoundNotify,
 741                                 (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
 742     {
 743         msg_Err( p_aout, "cannot get IDirectSoundNotify interface" );
 744         goto error;
 745     }
 746
 747     if FAILED( IDirectSoundNotify_SetNotificationPositions(
 748                                     p_aout->output.p_sys->p_dsnotify,
 749                                     FRAMES_NUM,
 750                                     p_aout->output.p_sys->p_notif->p_events ) )
 751     {
 752         msg_Err( p_aout, "cannot set position notification" );
 753         goto error;
 754     }
 755
 756     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 757     CheckReordering( p_aout, i_nb_channels );
 758
 759     return VLC_SUCCESS;
 760
 761  error:
 762     if( p_aout->output.p_sys->p_dsbuffer )
 763     {
 764         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 765         p_aout->output.p_sys->p_dsbuffer = NULL;
 766     }
 767     if( p_aout->output.p_sys->p_dsnotify )
 768     {
 769         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 770         p_aout->output.p_sys->p_dsnotify = NULL;
 771     }
 772     return VLC_EGENERIC;
 773 }
 774
 775 /*****************************************************************************
 776  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 777  *****************************************************************************
 778  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 779  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 780  ****************************************************************************/
 781 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 782                               int i_channels, int i_nb_channels, int i_rate,
 783                               vlc_bool_t b_probe )
 784 {
 785     if( CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
 786                         i_channels, i_nb_channels, i_rate,
 787                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 788         != VLC_SUCCESS )
 789     {
 790         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
 791                              i_channels, i_nb_channels, i_rate,
 792                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 793              != VLC_SUCCESS )
 794         {
 795             return VLC_EGENERIC;
 796         }
 797         else
 798         {
 799             *i_format = VLC_FOURCC('s','1','6','l');
 800             return VLC_SUCCESS;
 801         }
 802     }
 803     else
 804     {
 805         *i_format = VLC_FOURCC('f','l','3','2');
 806         return VLC_SUCCESS;
 807     }
 808 }
 809
 810 /*****************************************************************************
 811  * DestroyDSBuffer
 812  *****************************************************************************
 813  * This function destroys the secondary buffer.
 814  *****************************************************************************/
 815 static void DestroyDSBuffer( aout_instance_t *p_aout )
 816 {
 817     if( p_aout->output.p_sys->p_dsnotify )
 818     {
 819         IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
 820         p_aout->output.p_sys->p_dsnotify = NULL;
 821     }
 822
 823     if( p_aout->output.p_sys->p_dsbuffer )
 824     {
 825         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 826         p_aout->output.p_sys->p_dsbuffer = NULL;
 827     }
 828 }
 829
 830 /*****************************************************************************
 831  * FillBuffer: Fill in one of the direct sound frame buffers.
 832  *****************************************************************************
 833  * Returns VLC_SUCCESS on success.
 834  *****************************************************************************/
 835 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 836                        aout_buffer_t *p_buffer )
 837 {
 838     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 839     void *p_write_position, *p_wrap_around;
 840     long l_bytes1, l_bytes2;
 841     HRESULT dsresult;
 842
 843     /* Before copying anything, we have to lock the buffer */
 844     dsresult = IDirectSoundBuffer_Lock(
 845                 p_aout->output.p_sys->p_dsbuffer,               /* DS buffer */
 846                 i_frame * p_notif->i_frame_size,             /* Start offset */
 847                 p_notif->i_frame_size,                    /* Number of bytes */
 848                 &p_write_position,                  /* Address of lock start */
 849                 &l_bytes1,       /* Count of bytes locked before wrap around */
 850                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 851                 &l_bytes2,               /* Count of bytes after wrap around */
 852                 0 );                                                /* Flags */
 853     if( dsresult == DSERR_BUFFERLOST )
 854     {
 855         IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 856         dsresult = IDirectSoundBuffer_Lock(
 857                                p_aout->output.p_sys->p_dsbuffer,
 858                                i_frame * p_notif->i_frame_size,
 859                                p_notif->i_frame_size,
 860                                &p_write_position,
 861                                &l_bytes1,
 862                                &p_wrap_around,
 863                                &l_bytes2,
 864                                0 );
 865     }
 866     if( dsresult != DS_OK )
 867     {
 868         msg_Warn( p_notif, "cannot lock buffer" );
 869         if( p_buffer ) aout_BufferFree( p_buffer );
 870         return VLC_EGENERIC;
 871     }
 872
 873     if( p_buffer == NULL )
 874     {
 875         memset( p_write_position, 0, l_bytes1 );
 876     }
 877     else if( p_aout->output.p_sys->b_chan_reorder )
 878     {
 879         /* Do the channel reordering here */
 880
 881         if( p_aout->output.output.i_format ==  VLC_FOURCC('s','1','6','l') )
 882           InterleaveS16( (int16_t *)p_buffer->p_buffer,
 883                          (int16_t *)p_write_position,
 884                          p_aout->output.p_sys->pi_chan_table,
 885                          aout_FormatNbChannels( &p_aout->output.output ) );
 886         else
 887           InterleaveFloat32( (float *)p_buffer->p_buffer,
 888                              (float *)p_write_position,
 889                              p_aout->output.p_sys->pi_chan_table,
 890                              aout_FormatNbChannels( &p_aout->output.output ) );
 891     }
 892     else
 893     {
 894         p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
 895                                   l_bytes1 );
 896         aout_BufferFree( p_buffer );
 897     }
 898
 899     /* Now the data has been copied, unlock the buffer */
 900     IDirectSoundBuffer_Unlock( p_aout->output.p_sys->p_dsbuffer,
 901                                p_write_position, l_bytes1,
 902                                p_wrap_around, l_bytes2 );
 903
 904     return VLC_SUCCESS;
 905 }
 906
 907 /*****************************************************************************
 908  * DirectSoundThread: this thread will capture play notification events.
 909  *****************************************************************************
 910  * We use this thread to emulate a callback mechanism. The thread probes for
 911  * event notification and fills up the DS secondary buffer when needed.
 912  *****************************************************************************/
 913 static void DirectSoundThread( notification_thread_t *p_notif )
 914 {
 915     HANDLE  notification_events[FRAMES_NUM];
 916     HRESULT dsresult;
 917     aout_instance_t *p_aout = p_notif->p_aout;
 918     int i, i_which_frame, i_last_frame, i_next_frame;
 919     mtime_t mtime;
 920     vlc_bool_t b_sleek;
 921
 922     for( i = 0; i < FRAMES_NUM; i++ )
 923         notification_events[i] = p_notif->p_events[i].hEventNotify;
 924
 925     /* We don't want any resampling when using S/PDIF output */
 926     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
 927
 928     /* Tell the main thread that we are ready */
 929     vlc_thread_ready( p_notif );
 930
 931     msg_Dbg( p_notif, "DirectSoundThread ready" );
 932
 933     /* Wait here until Play() is called */
 934     WaitForSingleObject( notification_events[0], INFINITE );
 935
 936     if( !p_notif->b_die )
 937     {
 938         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
 939
 940         /* start playing the buffer */
 941         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 942                                         0,                         /* Unused */
 943                                         0,                         /* Unused */
 944                                         DSBPLAY_LOOPING );          /* Flags */
 945         if( dsresult == DSERR_BUFFERLOST )
 946         {
 947             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 948             dsresult = IDirectSoundBuffer_Play(
 949                                             p_aout->output.p_sys->p_dsbuffer,
 950                                             0,                     /* Unused */
 951                                             0,                     /* Unused */
 952                                             DSBPLAY_LOOPING );      /* Flags */
 953         }
 954         if( dsresult != DS_OK )
 955         {
 956             msg_Err( p_aout, "cannot start playing buffer" );
 957         }
 958     }
 959
 960     while( !p_notif->b_die )
 961     {
 962         aout_buffer_t *p_buffer;
 963         long l_latency;
 964
 965         /* wait for the position notification */
 966         i_which_frame = WaitForMultipleObjects( FRAMES_NUM,
 967                                                 notification_events, 0,
 968                                                 INFINITE ) - WAIT_OBJECT_0;
 969
 970         if( p_notif->b_die )
 971             break;
 972
 973         mtime = mdate();
 974
 975         /* We take into account the current latency */
 976         if SUCCEEDED( IDirectSoundBuffer_GetCurrentPosition(
 977                         p_aout->output.p_sys->p_dsbuffer,
 978                         &l_latency, NULL ) )
 979         {
 980             if( l_latency > (i_which_frame * FRAME_SIZE)
 981                   && l_latency < ((i_which_frame+1) * FRAME_SIZE) )
 982             {
 983                 l_latency = - ( l_latency /
 984                                 p_aout->output.output.i_bytes_per_frame %
 985                                 FRAME_SIZE );
 986             }
 987             else
 988             {
 989                 l_latency = FRAME_SIZE - ( l_latency /
 990                                       p_aout->output.output.i_bytes_per_frame %
 991                                       FRAME_SIZE );
 992             }
 993         }
 994         else
 995         {
 996             l_latency = 0;
 997         }
 998
 999         /* Mark last frame as empty */
1000         i_last_frame = (i_which_frame + FRAMES_NUM -1) % FRAMES_NUM;
1001         i_next_frame = (i_which_frame + 1) % FRAMES_NUM;
1002         p_notif->i_frame_status[i_last_frame] = FRAME_EMPTY;
1003
1004         /* Try to fill in as many frame buffers as possible */
1005         for( i = i_next_frame; (i % FRAMES_NUM) != i_which_frame; i++ )
1006         {
1007
1008             /* Check if frame buf is already filled */
1009             if( p_notif->i_frame_status[i % FRAMES_NUM] == FRAME_QUEUED )
1010                 continue;
1011
1012             p_buffer = aout_OutputNextBuffer( p_aout,
1013                 mtime + 1000000 / p_aout->output.output.i_rate *
1014                 ((i - i_next_frame + 1) * FRAME_SIZE + l_latency), b_sleek );
1015
1016             /* If there is no audio data available and we have some buffered
1017              * already, then just wait for the next time */
1018             if( !p_buffer && (i != i_next_frame) )
1019             {
1020                 //msg_Err( p_aout, "only %i frame buffers filled!",
1021                 //         i - i_next_frame );
1022                 break;
1023             }
1024
1025             if( FillBuffer( p_aout, (i%FRAMES_NUM), p_buffer )
1026                 != VLC_SUCCESS )
1027                 break;
1028
1029             /* Mark the frame buffer as QUEUED */
1030             p_notif->i_frame_status[i%FRAMES_NUM] = FRAME_QUEUED;
1031         }
1032
1033     }
1034
1035     /* make sure the buffer isn't playing */
1036     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1037
1038     /* free the events */
1039     for( i = 0; i < FRAMES_NUM; i++ )
1040         CloseHandle( notification_events[i] );
1041
1042     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1043 }
1044
1045 /*****************************************************************************
1046  * CheckReordering: Check if we need to do some channel re-ordering (the ac3
1047  *                  channel order is different from the one chosen by
1048  *                  Microsoft).
1049  *****************************************************************************/
1050 static void CheckReordering( aout_instance_t *p_aout, int i_nb_channels )
1051 {
1052     int i, j, k, l;
1053
1054 #define i_channel_mask p_aout->output.p_sys->i_channel_mask
1055 #define pi_chan_table p_aout->output.p_sys->pi_chan_table
1056
1057     p_aout->output.p_sys->b_chan_reorder = VLC_FALSE;
1058
1059     pi_chan_table = malloc( i_nb_channels * sizeof(int) );
1060     if( !pi_chan_table )
1061     {
1062         return;
1063     }
1064
1065     for( i = 0, j = 0;
1066          i < (int)(sizeof(pi_channels_out)/sizeof(uint32_t)); i++ )
1067     {
1068         if( i_channel_mask & pi_channels_out[i] )
1069         {
1070             for( k = 0, l = 0;
1071                  pi_channels_out[i] != pi_channels_ordered[k]; k++ )
1072             {
1073                 if( i_channel_mask & pi_channels_ordered[k] )
1074                 {
1075                     l++;
1076                 }
1077             }
1078
1079             pi_chan_table[j] = l;
1080
1081             j++;
1082         }
1083     }
1084
1085     for( i = 0; i < i_nb_channels; i++ )
1086     {
1087         if( pi_chan_table[i] != i )
1088         {
1089             p_aout->output.p_sys->b_chan_reorder = VLC_TRUE;
1090         }
1091     }
1092
1093     if( p_aout->output.p_sys->b_chan_reorder )
1094     {
1095         msg_Dbg( p_aout, "channel reordering needed" );
1096     }
1097
1098 #undef pi_chan_table
1099 #undef waveformat
1100 }
1101
1102 /*****************************************************************************
1103  * InterleaveFloat32/S16: change the channel order to the Microsoft one.
1104  *****************************************************************************/
1105 static void InterleaveFloat32( float *p_buf, float *p_buf_out,
1106                                int *pi_chan_table, int i_nb_channels )
1107 {
1108     int i, j;
1109
1110     for( i = 0; i < FRAME_SIZE; i++ )
1111     {
1112         for( j = 0; j < i_nb_channels; j++ )
1113         {
1114             p_buf_out[i*i_nb_channels + pi_chan_table[j]] =
1115                 p_buf[i*i_nb_channels + j];
1116         }
1117     }
1118 }
1119
1120 static void InterleaveS16( int16_t *p_buf, int16_t *p_buf_out,
1121                            int *pi_chan_table, int i_nb_channels )
1122 {
1123     int i, j;
1124
1125     for( i = 0; i < FRAME_SIZE; i++ )
1126     {
1127         for( j = 0; j < i_nb_channels; j++ )
1128         {
1129             p_buf_out[ i*i_nb_channels + pi_chan_table[j]] =
1130                 p_buf[i*i_nb_channels + j];
1131         }
1132     }
1133 }