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 1.17 2003/04/07 16:02:08 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 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT, WAVE_FORMAT_IEEE_FLOAT, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 127 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_PCM, WAVE_FORMAT_PCM, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 128 DEFINE_GUID( _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF, WAVE_FORMAT_DOLBY_AC3_SPDIF, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71 );
 129
 130 /*****************************************************************************
 131  * notification_thread_t: DirectX event thread
 132  *****************************************************************************/
 133 typedef struct notification_thread_t
 134 {
 135     VLC_COMMON_MEMBERS
 136
 137     aout_instance_t * p_aout;
 138     int i_frame_status[FRAMES_NUM];           /* status of each frame buffer */
 139     DSBPOSITIONNOTIFY p_events[FRAMES_NUM];      /* play notification events */
 140     int i_frame_size;                         /* Size in bytes of one frame */
 141
 142     mtime_t start_date;
 143
 144 } notification_thread_t;
 145
 146 /*****************************************************************************
 147  * aout_sys_t: directx audio output method descriptor
 148  *****************************************************************************
 149  * This structure is part of the audio output thread descriptor.
 150  * It describes the direct sound specific properties of an audio device.
 151  *****************************************************************************/
 152 struct aout_sys_t
 153 {
 154     HINSTANCE           hdsound_dll;      /* handle of the opened dsound dll */
 155     LPDIRECTSOUND       p_dsobject;              /* main Direct Sound object */
 156     LPDIRECTSOUNDBUFFER p_dsbuffer;   /* the sound buffer we use (direct sound
 157                                        * takes care of mixing all the
 158                                        * secondary buffers into the primary) */
 159
 160     LPDIRECTSOUNDNOTIFY p_dsnotify;         /* the position notify interface */
 161     notification_thread_t *p_notif;                  /* DirectSoundThread id */
 162
 163     int b_playing;                                         /* playing status */
 164
 165     int i_frame_size;                         /* Size in bytes of one frame */
 166
 167     vlc_bool_t b_chan_reorder;              /* do we need channel reordering */
 168     int *pi_chan_table;
 169     uint32_t i_channel_mask;
 170 };
 171
 172 static const uint32_t pi_channels_in[] =
 173     { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 174       AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
 175       AOUT_CHAN_CENTER, AOUT_CHAN_LFE };
 176 static const uint32_t pi_channels_out[] =
 177     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT,
 178       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT,
 179       SPEAKER_FRONT_CENTER, SPEAKER_LOW_FREQUENCY };
 180 static const uint32_t pi_channels_ordered[] =
 181     { SPEAKER_FRONT_LEFT, SPEAKER_FRONT_RIGHT, SPEAKER_FRONT_CENTER,
 182       SPEAKER_LOW_FREQUENCY,
 183       SPEAKER_BACK_LEFT, SPEAKER_BACK_RIGHT };
 184
 185 /*****************************************************************************
 186  * Local prototypes.
 187  *****************************************************************************/
 188 static int  OpenAudio  ( vlc_object_t * );
 189 static void CloseAudio ( vlc_object_t * );
 190 static void Play       ( aout_instance_t * );
 191
 192 /* local functions */
 193 static void Probe             ( aout_instance_t * );
 194 static int  InitDirectSound   ( aout_instance_t * );
 195 static int  CreateDSBuffer    ( aout_instance_t *, int, int, int, int, int, vlc_bool_t );
 196 static int  CreateDSBufferPCM ( aout_instance_t *, int*, int, int, int, vlc_bool_t );
 197 static void DestroyDSBuffer   ( aout_instance_t * );
 198 static void DirectSoundThread ( notification_thread_t * );
 199 static int  FillBuffer        ( aout_instance_t *, int, aout_buffer_t * );
 200
 201 static void CheckReordering   ( aout_instance_t *, int );
 202 static void InterleaveFloat32 ( float *, float *, int *, int );
 203 static void InterleaveS16     ( int16_t *, int16_t *, int *, int );
 204
 205 /*****************************************************************************
 206  * Module descriptor
 207  *****************************************************************************/
 208 vlc_module_begin();
 209     set_description( _("DirectX audio output") );
 210     set_capability( "audio output", 100 );
 211     add_shortcut( "directx" );
 212     set_callbacks( OpenAudio, CloseAudio );
 213 vlc_module_end();
 214
 215 /*****************************************************************************
 216  * OpenAudio: open the audio device
 217  *****************************************************************************
 218  * This function opens and setups Direct Sound.
 219  *****************************************************************************/
 220 static int OpenAudio( vlc_object_t *p_this )
 221 {
 222     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 223     vlc_value_t val;
 224     int i;
 225
 226     msg_Dbg( p_aout, "OpenAudio" );
 227
 228    /* Allocate structure */
 229     p_aout->output.p_sys = malloc( sizeof( aout_sys_t ) );
 230     if( p_aout->output.p_sys == NULL )
 231     {
 232         msg_Err( p_aout, "out of memory" );
 233         return VLC_EGENERIC;
 234     }
 235
 236     /* Initialize some variables */
 237     p_aout->output.p_sys->p_dsobject = NULL;
 238     p_aout->output.p_sys->p_dsbuffer = NULL;
 239     p_aout->output.p_sys->p_dsnotify = NULL;
 240     p_aout->output.p_sys->p_notif = NULL;
 241     p_aout->output.p_sys->b_playing = 0;
 242     p_aout->output.p_sys->pi_chan_table = NULL;
 243
 244     p_aout->output.pf_play = Play;
 245     aout_VolumeSoftInit( p_aout );
 246
 247     /* Initialise DirectSound */
 248     if( InitDirectSound( p_aout ) )
 249     {
 250         msg_Err( p_aout, "cannot initialize DirectSound" );
 251         goto error;
 252     }
 253
 254     /* Now we need to setup our DirectSound play notification structure */
 255     p_aout->output.p_sys->p_notif =
 256         vlc_object_create( p_aout, sizeof(notification_thread_t) );
 257     p_aout->output.p_sys->p_notif->p_aout = p_aout;
 258
 259     if( var_Type( p_aout, "audio-device" ) == 0 )
 260     {
 261         Probe( p_aout );
 262     }
 263
 264     if( var_Get( p_aout, "audio-device", &val ) < 0 )
 265     {
 266         /* Probe() has failed. */
 267         free( p_aout->output.p_sys );
 268         return VLC_EGENERIC;
 269     }
 270
 271     /* Then create the notification events */
 272     for( i = 0; i < FRAMES_NUM; i++ )
 273         p_aout->output.p_sys->p_notif->p_events[i].hEventNotify =
 274             CreateEvent( NULL, FALSE, FALSE, NULL );
 275
 276     /* Open the device */
 277     if( !strcmp( val.psz_string, N_("A/52 over S/PDIF") ) )
 278     {
 279         free( val.psz_string );
 280         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 281
 282         /* Calculate the frame size in bytes */
 283         p_aout->output.i_nb_samples = A52_FRAME_NB;
 284         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 285         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 286         p_aout->output.p_sys->i_frame_size =
 287             p_aout->output.output.i_bytes_per_frame;
 288
 289         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 290                             p_aout->output.output.i_physical_channels,
 291                             aout_FormatNbChannels( &p_aout->output.output ),
 292                             p_aout->output.output.i_rate,
 293                             p_aout->output.p_sys->i_frame_size, VLC_FALSE )
 294             != VLC_SUCCESS )
 295         {
 296             msg_Err( p_aout, "cannot open waveout audio device" );
 297             free( p_aout->output.p_sys );
 298             return VLC_EGENERIC;
 299         }
 300
 301         aout_VolumeNoneInit( p_aout );
 302     }
 303     else
 304     {
 305         if( !strcmp( val.psz_string, N_("5.1") ) )
 306         {
 307             p_aout->output.output.i_physical_channels
 308                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 309                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 310                    | AOUT_CHAN_LFE;
 311         }
 312         else if( !strcmp( val.psz_string, N_("2 Front 2 Rear") ) )
 313         {
 314             p_aout->output.output.i_physical_channels
 315                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 316                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 317         }
 318         else if( !strcmp( val.psz_string, "Mono" ) )
 319         {
 320             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 321         }
 322         else
 323         {
 324             p_aout->output.output.i_physical_channels
 325                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 326         }
 327         free( val.psz_string );
 328
 329         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 330                                p_aout->output.output.i_physical_channels,
 331                                aout_FormatNbChannels( &p_aout->output.output ),
 332                                p_aout->output.output.i_rate, VLC_FALSE )
 333             != VLC_SUCCESS )
 334         {
 335             msg_Err( p_aout, "cannot open waveout audio device" );
 336             free( p_aout->output.p_sys );
 337             return VLC_EGENERIC;
 338         }
 339
 340         /* Calculate the frame size in bytes */
 341         p_aout->output.i_nb_samples = FRAME_SIZE;
 342         aout_FormatPrepare( &p_aout->output.output );
 343         p_aout->output.p_sys->i_frame_size =
 344             FRAME_SIZE * p_aout->output.output.i_bytes_per_frame;
 345
 346         aout_VolumeSoftInit( p_aout );
 347     }
 348
 349     /* then launch the notification thread */
 350     msg_Dbg( p_aout, "creating DirectSoundThread" );
 351     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 352                            "DirectSound Notification Thread",
 353                            DirectSoundThread,
 354                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
 355     {
 356         msg_Err( p_aout, "cannot create DirectSoundThread" );
 357         goto error;
 358     }
 359
 360     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 361
 362     return VLC_SUCCESS;
 363
 364  error:
 365     CloseAudio( VLC_OBJECT(p_aout) );
 366     return VLC_EGENERIC;
 367 }
 368
 369 /*****************************************************************************
 370  * Probe: probe the audio device for available formats and channels
 371  *****************************************************************************/
 372 static void Probe( aout_instance_t * p_aout )
 373 {
 374     vlc_value_t val;
 375     int i_format;
 376     unsigned int i_physical_channels;
 377     DWORD ui_speaker_config;
 378
 379     var_Create( p_aout, "audio-device", VLC_VAR_STRING | VLC_VAR_HASCHOICE );
 380
 381     /* Test for 5.1 support */
 382     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 383                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 384                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 385     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 386     {
 387         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 388                                p_aout->output.output.i_rate, VLC_TRUE )
 389             == VLC_SUCCESS )
 390         {
 391             val.psz_string = N_("5.1");
 392             var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 393             msg_Dbg( p_aout, "device supports 5.1 channels" );
 394         }
 395     }
 396
 397     /* Test for 2 Front 2 Rear support */
 398     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 399                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 400     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 401         == i_physical_channels )
 402     {
 403         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 404                                p_aout->output.output.i_rate, VLC_TRUE )
 405             == VLC_SUCCESS )
 406         {
 407             val.psz_string = N_("2 Front 2 Rear");
 408             var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 409             msg_Dbg( p_aout, "device supports 4 channels" );
 410         }
 411     }
 412
 413     /* Test for stereo support */
 414     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 415     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 416                            p_aout->output.output.i_rate, VLC_TRUE )
 417         == VLC_SUCCESS )
 418     {
 419         val.psz_string = N_("Stereo");
 420         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 421         msg_Dbg( p_aout, "device supports 2 channels" );
 422     }
 423
 424     /* Test for mono support */
 425     i_physical_channels = AOUT_CHAN_CENTER;
 426     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 427                            p_aout->output.output.i_rate, VLC_TRUE )
 428         == VLC_SUCCESS )
 429     {
 430         val.psz_string = N_("Mono");
 431         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 432         msg_Dbg( p_aout, "device supports 1 channel" );
 433     }
 434
 435     /* Check the speaker configuration to determine which channel config should
 436      * be the default */
 437     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 438                                               &ui_speaker_config ) )
 439     {
 440         ui_speaker_config = DSSPEAKER_STEREO;
 441     }
 442     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 443     {
 444     case DSSPEAKER_5POINT1:
 445         val.psz_string = N_("5.1");
 446         break;
 447     case DSSPEAKER_QUAD:
 448         val.psz_string = N_("2 Front 2 Rear");
 449         break;
 450     case DSSPEAKER_MONO:
 451         val.psz_string = N_("Mono");
 452         break;
 453     case DSSPEAKER_SURROUND:
 454     case DSSPEAKER_STEREO:
 455     default:
 456         val.psz_string = N_("Stereo");
 457         break;
 458     }
 459     var_Set( p_aout, "audio-device", val );
 460
 461     /* Test for SPDIF support */
 462     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 463     {
 464         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 465                             p_aout->output.output.i_physical_channels,
 466                             aout_FormatNbChannels( &p_aout->output.output ),
 467                             p_aout->output.output.i_rate,
 468                             AOUT_SPDIF_SIZE, VLC_TRUE )
 469             == VLC_SUCCESS )
 470         {
 471             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 472             val.psz_string = N_("A/52 over S/PDIF");
 473             var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val );
 474             if( config_GetInt( p_aout, "spdif" ) )
 475                 var_Set( p_aout, "audio-device", val );
 476         }
 477     }
 478
 479     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 480
 481     val.b_bool = VLC_TRUE;
 482     var_Set( p_aout, "intf-change", val );
 483 }
 484
 485 /*****************************************************************************
 486  * Play: we'll start playing the directsound buffer here because at least here
 487  *       we know the first buffer has been put in the aout fifo and we also
 488  *       know its date.
 489  *****************************************************************************/
 490 static void Play( aout_instance_t *p_aout )
 491 {
 492     if( !p_aout->output.p_sys->b_playing )
 493     {
 494         aout_buffer_t *p_buffer;
 495
 496         p_aout->output.p_sys->b_playing = 1;
 497
 498         /* get the playing date of the first aout buffer */
 499         p_aout->output.p_sys->p_notif->start_date =
 500             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 501
 502         /* fill in the first samples */
 503         p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 504         FillBuffer( p_aout, 0, p_buffer );
 505
 506         /* wake up the audio output thread */
 507         SetEvent( p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 508     }
 509 }
 510
 511 /*****************************************************************************
 512  * CloseAudio: close the audio device
 513  *****************************************************************************/
 514 static void CloseAudio( vlc_object_t *p_this )
 515 {
 516     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 517
 518     msg_Dbg( p_aout, "CloseAudio" );
 519
 520     /* kill the position notification thread, if any */
 521     if( p_aout->output.p_sys->p_notif )
 522     {
 523         vlc_object_detach( p_aout->output.p_sys->p_notif );
 524         if( p_aout->output.p_sys->p_notif->b_thread )
 525         {
 526             p_aout->output.p_sys->p_notif->b_die = 1;
 527
 528             if( !p_aout->output.p_sys->b_playing )
 529                 /* wake up the audio thread */
 530                 SetEvent(
 531                     p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 532
 533             vlc_thread_join( p_aout->output.p_sys->p_notif );
 534         }
 535         vlc_object_destroy( p_aout->output.p_sys->p_notif );
 536     }
 537
 538     /* release the secondary buffer */
 539     DestroyDSBuffer( p_aout );
 540
 541     /* finally release the DirectSound object */
 542     if( p_aout->output.p_sys->p_dsobject )
 543         IDirectSound_Release( p_aout->output.p_sys->p_dsobject );
 544
 545     /* free DSOUND.DLL */
 546     if( p_aout->output.p_sys->hdsound_dll )
 547        FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 548
 549     if( p_aout->output.p_sys->pi_chan_table )
 550         free( p_aout->output.p_sys->pi_chan_table );
 551
 552     free( p_aout->output.p_sys );
 553 }
 554
 555 /*****************************************************************************
 556  * InitDirectSound: handle all the gory details of DirectSound initialisation
 557  *****************************************************************************/
 558 static int InitDirectSound( aout_instance_t *p_aout )
 559 {
 560     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 561
 562     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 563     if( p_aout->output.p_sys->hdsound_dll == NULL )
 564     {
 565         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 566         goto error;
 567     }
 568
 569     OurDirectSoundCreate = (void *)GetProcAddress(
 570                                            p_aout->output.p_sys->hdsound_dll,
 571                                            "DirectSoundCreate" );
 572     if( OurDirectSoundCreate == NULL )
 573     {
 574         msg_Warn( p_aout, "GetProcAddress FAILED" );
 575         goto error;
 576     }
 577
 578     /* Create the direct sound object */
 579     if FAILED( OurDirectSoundCreate( NULL, &p_aout->output.p_sys->p_dsobject,
 580                                      NULL ) )
 581     {
 582         msg_Warn( p_aout, "cannot create a direct sound device" );
 583         goto error;
 584     }
 585
 586     /* Set DirectSound Cooperative level, ie what control we want over Windows
 587      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 588      * settings of the primary buffer, but also that only the sound of our
 589      * application will be hearable when it will have the focus.
 590      * !!! (this is not really working as intended yet because to set the
 591      * cooperative level you need the window handle of your application, and
 592      * I don't know of any easy way to get it. Especially since we might play
 593      * sound without any video, and so what window handle should we use ???
 594      * The hack for now is to use the Desktop window handle - it seems to be
 595      * working */
 596     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 597                                           GetDesktopWindow(),
 598                                           DSSCL_EXCLUSIVE) )
 599     {
 600         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 601     }
 602
 603     return VLC_SUCCESS;
 604
 605  error:
 606     p_aout->output.p_sys->p_dsobject = NULL;
 607     if( p_aout->output.p_sys->hdsound_dll )
 608     {
 609         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 610         p_aout->output.p_sys->hdsound_dll = NULL;
 611     }
 612     return VLC_EGENERIC;
 613
 614 }
 615
 616 /*****************************************************************************
 617  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 618  *****************************************************************************
 619  * This function creates the buffer we'll use to play audio.
 620  * In DirectSound there are two kinds of buffers:
 621  * - the primary buffer: which is the actual buffer that the soundcard plays
 622  * - the secondary buffer(s): these buffers are the one actually used by
 623  *    applications and DirectSound takes care of mixing them into the primary.
 624  *
 625  * Once you create a secondary buffer, you cannot change its format anymore so
 626  * you have to release the current one and create another.
 627  *****************************************************************************/
 628 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 629                            int i_channels, int i_nb_channels, int i_rate,
 630                            int i_bytes_per_frame, vlc_bool_t b_probe )
 631 {
 632     WAVEFORMATEXTENSIBLE waveformat;
 633     DSBUFFERDESC         dsbdesc;
 634     unsigned int         i;
 635
 636     /* First set the sound buffer format */
 637     waveformat.dwChannelMask = 0;
 638     for( i = 0; i < sizeof(pi_channels_in)/sizeof(uint32_t); i++ )
 639     {
 640         if( i_channels & pi_channels_in[i] )
 641             waveformat.dwChannelMask |= pi_channels_out[i];
 642     }
 643
 644     switch( i_format )
 645     {
 646     case VLC_FOURCC('s','p','d','i'):
 647         i_nb_channels = 2;
 648         /* To prevent channel re-ordering */
 649         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 650         waveformat.Format.wBitsPerSample = 16;
 651         waveformat.Samples.wValidBitsPerSample =
 652             waveformat.Format.wBitsPerSample;
 653         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 654         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 655         break;
 656
 657     case VLC_FOURCC('f','l','3','2'):
 658         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 659         waveformat.Samples.wValidBitsPerSample =
 660             waveformat.Format.wBitsPerSample;
 661         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 662         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 663         break;
 664
 665     case VLC_FOURCC('s','1','6','l'):
 666         waveformat.Format.wBitsPerSample = 16;
 667         waveformat.Samples.wValidBitsPerSample =
 668             waveformat.Format.wBitsPerSample;
 669         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 670         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 671         break;
 672     }
 673
 674     waveformat.Format.nChannels = i_nb_channels;
 675     waveformat.Format.nSamplesPerSec = i_rate;
 676     waveformat.Format.nBlockAlign =
 677         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 678     waveformat.Format.nAvgBytesPerSec =
 679         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 680
 681     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 682     if( i_nb_channels <= 2 )
 683     {
 684         waveformat.Format.cbSize = 0;
 685     }
 686     else
 687     {
 688         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 689         waveformat.Format.cbSize =
 690             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 691     }
 692
 693
 694     /* Then fill in the direct sound descriptor */
 695     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 696     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 697     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 698                     | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
 699                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 700     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 701     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 702
 703     if FAILED( IDirectSound_CreateSoundBuffer(
 704                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 705                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 706     {
 707         goto error;
 708     }
 709
 710     /* Stop here if we were just probing */
 711     if( b_probe )
 712     {
 713         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 714         p_aout->output.p_sys->p_dsbuffer = NULL;
 715         return VLC_SUCCESS;
 716     }
 717
 718     /* Backup the size of a frame */
 719     p_aout->output.p_sys->p_notif->i_frame_size = i_bytes_per_frame;
 720
 721     /* Now the secondary buffer is created, we need to setup its position
 722      * notification */
 723     for( i = 0; i < FRAMES_NUM; i++ )
 724     {
 725         p_aout->output.p_sys->p_notif->p_events[i].dwOffset = i *
 726             p_aout->output.p_sys->p_notif->i_frame_size;
 727
 728         p_aout->output.p_sys->p_notif->i_frame_status[i] = FRAME_EMPTY;
 729     }
 730
 731     /* Get the IDirectSoundNotify interface */
 732     if FAILED( IDirectSoundBuffer_QueryInterface(
 733                                 p_aout->output.p_sys->p_dsbuffer,
 734                                 &IID_IDirectSoundNotify,
 735                                 (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
 736     {
 737         msg_Err( p_aout, "cannot get IDirectSoundNotify interface" );
 738         goto error;
 739     }
 740
 741     if FAILED( IDirectSoundNotify_SetNotificationPositions(
 742                                     p_aout->output.p_sys->p_dsnotify,
 743                                     FRAMES_NUM,
 744                                     p_aout->output.p_sys->p_notif->p_events ) )
 745     {
 746         msg_Err( p_aout, "cannot set position notification" );
 747         goto error;
 748     }
 749
 750     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 751     CheckReordering( p_aout, i_nb_channels );
 752
 753     return VLC_SUCCESS;
 754
 755  error:
 756     if( p_aout->output.p_sys->p_dsbuffer )
 757     {
 758         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 759         p_aout->output.p_sys->p_dsbuffer = NULL;
 760     }
 761     if( p_aout->output.p_sys->p_dsnotify )
 762     {
 763         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 764         p_aout->output.p_sys->p_dsnotify = NULL;
 765     }
 766     return VLC_EGENERIC;
 767 }
 768
 769 /*****************************************************************************
 770  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 771  *****************************************************************************
 772  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 773  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 774  ****************************************************************************/
 775 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 776                               int i_channels, int i_nb_channels, int i_rate,
 777                               vlc_bool_t b_probe )
 778 {
 779     if( CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
 780                         i_channels, i_nb_channels, i_rate,
 781                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 782         != VLC_SUCCESS )
 783     {
 784         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
 785                              i_channels, i_nb_channels, i_rate,
 786                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 787              != VLC_SUCCESS )
 788         {
 789             return VLC_EGENERIC;
 790         }
 791         else
 792         {
 793             *i_format = VLC_FOURCC('s','1','6','l');
 794             return VLC_SUCCESS;
 795         }
 796     }
 797     else
 798     {
 799         *i_format = VLC_FOURCC('f','l','3','2');
 800         return VLC_SUCCESS;
 801     }
 802 }
 803
 804 /*****************************************************************************
 805  * DestroyDSBuffer
 806  *****************************************************************************
 807  * This function destroys the secondary buffer.
 808  *****************************************************************************/
 809 static void DestroyDSBuffer( aout_instance_t *p_aout )
 810 {
 811     if( p_aout->output.p_sys->p_dsnotify )
 812     {
 813         IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
 814         p_aout->output.p_sys->p_dsnotify = NULL;
 815     }
 816
 817     if( p_aout->output.p_sys->p_dsbuffer )
 818     {
 819         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 820         p_aout->output.p_sys->p_dsbuffer = NULL;
 821     }
 822 }
 823
 824 /*****************************************************************************
 825  * FillBuffer: Fill in one of the direct sound frame buffers.
 826  *****************************************************************************
 827  * Returns VLC_SUCCESS on success.
 828  *****************************************************************************/
 829 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 830                        aout_buffer_t *p_buffer )
 831 {
 832     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 833     void *p_write_position, *p_wrap_around;
 834     long l_bytes1, l_bytes2;
 835     HRESULT dsresult;
 836
 837     /* Before copying anything, we have to lock the buffer */
 838     dsresult = IDirectSoundBuffer_Lock(
 839                 p_aout->output.p_sys->p_dsbuffer,               /* DS buffer */
 840                 i_frame * p_notif->i_frame_size,             /* Start offset */
 841                 p_notif->i_frame_size,                    /* Number of bytes */
 842                 &p_write_position,                  /* Address of lock start */
 843                 &l_bytes1,       /* Count of bytes locked before wrap around */
 844                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 845                 &l_bytes2,               /* Count of bytes after wrap around */
 846                 0 );                                                /* Flags */
 847     if( dsresult == DSERR_BUFFERLOST )
 848     {
 849         IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 850         dsresult = IDirectSoundBuffer_Lock(
 851                                p_aout->output.p_sys->p_dsbuffer,
 852                                i_frame * p_notif->i_frame_size,
 853                                p_notif->i_frame_size,
 854                                &p_write_position,
 855                                &l_bytes1,
 856                                &p_wrap_around,
 857                                &l_bytes2,
 858                                0 );
 859     }
 860     if( dsresult != DS_OK )
 861     {
 862         msg_Warn( p_notif, "cannot lock buffer" );
 863         if( p_buffer ) aout_BufferFree( p_buffer );
 864         return VLC_EGENERIC;
 865     }
 866
 867     if( p_buffer == NULL )
 868     {
 869         memset( p_write_position, 0, l_bytes1 );
 870     }
 871     else if( p_aout->output.p_sys->b_chan_reorder )
 872     {
 873         /* Do the channel reordering here */
 874
 875         if( p_aout->output.output.i_format ==  VLC_FOURCC('s','1','6','l') )
 876           InterleaveS16( (int16_t *)p_buffer->p_buffer,
 877                          (int16_t *)p_write_position,
 878                          p_aout->output.p_sys->pi_chan_table,
 879                          aout_FormatNbChannels( &p_aout->output.output ) );
 880         else
 881           InterleaveFloat32( (float *)p_buffer->p_buffer,
 882                              (float *)p_write_position,
 883                              p_aout->output.p_sys->pi_chan_table,
 884                              aout_FormatNbChannels( &p_aout->output.output ) );
 885     }
 886     else
 887     {
 888         p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
 889                                   l_bytes1 );
 890         aout_BufferFree( p_buffer );
 891     }
 892
 893     /* Now the data has been copied, unlock the buffer */
 894     IDirectSoundBuffer_Unlock( p_aout->output.p_sys->p_dsbuffer,
 895                                p_write_position, l_bytes1,
 896                                p_wrap_around, l_bytes2 );
 897
 898     return VLC_SUCCESS;
 899 }
 900
 901 /*****************************************************************************
 902  * DirectSoundThread: this thread will capture play notification events.
 903  *****************************************************************************
 904  * We use this thread to emulate a callback mechanism. The thread probes for
 905  * event notification and fills up the DS secondary buffer when needed.
 906  *****************************************************************************/
 907 static void DirectSoundThread( notification_thread_t *p_notif )
 908 {
 909     HANDLE  notification_events[FRAMES_NUM];
 910     HRESULT dsresult;
 911     aout_instance_t *p_aout = p_notif->p_aout;
 912     int i, i_which_frame, i_last_frame, i_next_frame;
 913     mtime_t mtime;
 914     vlc_bool_t b_sleek;
 915
 916     for( i = 0; i < FRAMES_NUM; i++ )
 917         notification_events[i] = p_notif->p_events[i].hEventNotify;
 918
 919     /* We don't want any resampling when using S/PDIF output */
 920     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
 921
 922     /* Tell the main thread that we are ready */
 923     vlc_thread_ready( p_notif );
 924
 925     msg_Dbg( p_notif, "DirectSoundThread ready" );
 926
 927     /* Wait here until Play() is called */
 928     WaitForSingleObject( notification_events[0], INFINITE );
 929
 930     if( !p_notif->b_die )
 931     {
 932         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
 933
 934         /* start playing the buffer */
 935         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 936                                         0,                         /* Unused */
 937                                         0,                         /* Unused */
 938                                         DSBPLAY_LOOPING );          /* Flags */
 939         if( dsresult == DSERR_BUFFERLOST )
 940         {
 941             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 942             dsresult = IDirectSoundBuffer_Play(
 943                                             p_aout->output.p_sys->p_dsbuffer,
 944                                             0,                     /* Unused */
 945                                             0,                     /* Unused */
 946                                             DSBPLAY_LOOPING );      /* Flags */
 947         }
 948         if( dsresult != DS_OK )
 949         {
 950             msg_Err( p_aout, "cannot start playing buffer" );
 951         }
 952     }
 953
 954     while( !p_notif->b_die )
 955     {
 956         aout_buffer_t *p_buffer;
 957         long l_latency;
 958
 959         /* wait for the position notification */
 960         i_which_frame = WaitForMultipleObjects( FRAMES_NUM,
 961                                                 notification_events, 0,
 962                                                 INFINITE ) - WAIT_OBJECT_0;
 963
 964         if( p_notif->b_die )
 965             break;
 966
 967         mtime = mdate();
 968
 969         /* We take into account the current latency */
 970         if SUCCEEDED( IDirectSoundBuffer_GetCurrentPosition(
 971                         p_aout->output.p_sys->p_dsbuffer,
 972                         &l_latency, NULL ) )
 973         {
 974             if( l_latency > (i_which_frame * FRAME_SIZE)
 975                   && l_latency < ((i_which_frame+1) * FRAME_SIZE) )
 976             {
 977                 l_latency = - ( l_latency /
 978                                 p_aout->output.output.i_bytes_per_frame %
 979                                 FRAME_SIZE );
 980             }
 981             else
 982             {
 983                 l_latency = FRAME_SIZE - ( l_latency /
 984                                       p_aout->output.output.i_bytes_per_frame %
 985                                       FRAME_SIZE );
 986             }
 987         }
 988         else
 989         {
 990             l_latency = 0;
 991         }
 992
 993         /* Mark last frame as empty */
 994         i_last_frame = (i_which_frame + FRAMES_NUM -1) % FRAMES_NUM;
 995         i_next_frame = (i_which_frame + 1) % FRAMES_NUM;
 996         p_notif->i_frame_status[i_last_frame] = FRAME_EMPTY;
 997
 998         /* Try to fill in as many frame buffers as possible */
 999         for( i = i_next_frame; (i % FRAMES_NUM) != i_which_frame; i++ )
1000         {
1001
1002             /* Check if frame buf is already filled */
1003             if( p_notif->i_frame_status[i % FRAMES_NUM] == FRAME_QUEUED )
1004                 continue;
1005
1006             p_buffer = aout_OutputNextBuffer( p_aout,
1007                 mtime + 1000000 / p_aout->output.output.i_rate *
1008                 ((i - i_next_frame + 1) * FRAME_SIZE + l_latency), b_sleek );
1009
1010             /* If there is no audio data available and we have some buffered
1011              * already, then just wait for the next time */
1012             if( !p_buffer && (i != i_next_frame) )
1013             {
1014                 //msg_Err( p_aout, "only %i frame buffers filled!",
1015                 //         i - i_next_frame );
1016                 break;
1017             }
1018
1019             if( FillBuffer( p_aout, (i%FRAMES_NUM), p_buffer )
1020                 != VLC_SUCCESS )
1021                 break;
1022
1023             /* Mark the frame buffer as QUEUED */
1024             p_notif->i_frame_status[i%FRAMES_NUM] = FRAME_QUEUED;
1025         }
1026
1027     }
1028
1029     /* make sure the buffer isn't playing */
1030     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1031
1032     /* free the events */
1033     for( i = 0; i < FRAMES_NUM; i++ )
1034         CloseHandle( notification_events[i] );
1035
1036     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1037 }
1038
1039 /*****************************************************************************
1040  * CheckReordering: Check if we need to do some channel re-ordering (the ac3
1041  *                  channel order is different from the one chosen by
1042  *                  Microsoft).
1043  *****************************************************************************/
1044 static void CheckReordering( aout_instance_t *p_aout, int i_nb_channels )
1045 {
1046     int i, j, k, l;
1047
1048 #define i_channel_mask p_aout->output.p_sys->i_channel_mask
1049 #define pi_chan_table p_aout->output.p_sys->pi_chan_table
1050
1051     p_aout->output.p_sys->b_chan_reorder = VLC_FALSE;
1052
1053     pi_chan_table = malloc( i_nb_channels * sizeof(int) );
1054     if( !pi_chan_table )
1055     {
1056         return;
1057     }
1058
1059     for( i = 0, j = 0;
1060          i < (int)(sizeof(pi_channels_out)/sizeof(uint32_t)); i++ )
1061     {
1062         if( i_channel_mask & pi_channels_out[i] )
1063         {
1064             for( k = 0, l = 0;
1065                  pi_channels_out[i] != pi_channels_ordered[k]; k++ )
1066             {
1067                 if( i_channel_mask & pi_channels_ordered[k] )
1068                 {
1069                     l++;
1070                 }
1071             }
1072
1073             pi_chan_table[j] = l;
1074
1075             j++;
1076         }
1077     }
1078
1079     for( i = 0; i < i_nb_channels; i++ )
1080     {
1081         if( pi_chan_table[i] != i )
1082         {
1083             p_aout->output.p_sys->b_chan_reorder = VLC_TRUE;
1084         }
1085     }
1086
1087     if( p_aout->output.p_sys->b_chan_reorder )
1088     {
1089         msg_Dbg( p_aout, "channel reordering needed" );
1090     }
1091
1092 #undef pi_chan_table
1093 #undef waveformat
1094 }
1095
1096 /*****************************************************************************
1097  * InterleaveFloat32/S16: change the channel order to the Microsoft one.
1098  *****************************************************************************/
1099 static void InterleaveFloat32( float *p_buf, float *p_buf_out,
1100                                int *pi_chan_table, int i_nb_channels )
1101 {
1102     int i, j;
1103
1104     for( i = 0; i < FRAME_SIZE; i++ )
1105     {
1106         for( j = 0; j < i_nb_channels; j++ )
1107         {
1108             p_buf_out[i*i_nb_channels + pi_chan_table[j]] =
1109                 p_buf[i*i_nb_channels + j];
1110         }
1111     }
1112 }
1113
1114 static void InterleaveS16( int16_t *p_buf, int16_t *p_buf_out,
1115                            int *pi_chan_table, int i_nb_channels )
1116 {
1117     int i, j;
1118
1119     for( i = 0; i < FRAME_SIZE; i++ )
1120     {
1121         for( j = 0; j < i_nb_channels; j++ )
1122         {
1123             p_buf_out[ i*i_nb_channels + pi_chan_table[j]] =
1124                 p_buf[i*i_nb_channels + j];
1125         }
1126     }
1127 }