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 1.19 2003/05/04 22:42:15 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         goto error;
 268     }
 269
 270     /* Then create the notification events */
 271     for( i = 0; i < FRAMES_NUM; i++ )
 272         p_aout->output.p_sys->p_notif->p_events[i].hEventNotify =
 273             CreateEvent( NULL, FALSE, FALSE, NULL );
 274
 275     /* Open the device */
 276     if( val.i_int == AOUT_VAR_SPDIF )
 277     {
 278         p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
 279
 280         /* Calculate the frame size in bytes */
 281         p_aout->output.i_nb_samples = A52_FRAME_NB;
 282         p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
 283         p_aout->output.output.i_frame_length = A52_FRAME_NB;
 284         p_aout->output.p_sys->i_frame_size =
 285             p_aout->output.output.i_bytes_per_frame;
 286
 287         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 288                             p_aout->output.output.i_physical_channels,
 289                             aout_FormatNbChannels( &p_aout->output.output ),
 290                             p_aout->output.output.i_rate,
 291                             p_aout->output.p_sys->i_frame_size, VLC_FALSE )
 292             != VLC_SUCCESS )
 293         {
 294             msg_Err( p_aout, "cannot open directx audio device" );
 295             free( p_aout->output.p_sys );
 296             return VLC_EGENERIC;
 297         }
 298
 299         aout_VolumeNoneInit( p_aout );
 300     }
 301     else
 302     {
 303         if( val.i_int == AOUT_VAR_5_1 )
 304         {
 305             p_aout->output.output.i_physical_channels
 306                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 307                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
 308                    | AOUT_CHAN_LFE;
 309         }
 310         else if( val.i_int == AOUT_VAR_2F2R )
 311         {
 312             p_aout->output.output.i_physical_channels
 313                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 314                    | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 315         }
 316         else if( val.i_int == AOUT_VAR_MONO )
 317         {
 318             p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
 319         }
 320         else
 321         {
 322             p_aout->output.output.i_physical_channels
 323                 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 324         }
 325
 326         if( CreateDSBufferPCM( p_aout, &p_aout->output.output.i_format,
 327                                p_aout->output.output.i_physical_channels,
 328                                aout_FormatNbChannels( &p_aout->output.output ),
 329                                p_aout->output.output.i_rate, VLC_FALSE )
 330             != VLC_SUCCESS )
 331         {
 332             msg_Err( p_aout, "cannot open directx audio device" );
 333             free( p_aout->output.p_sys );
 334             return VLC_EGENERIC;
 335         }
 336
 337         /* Calculate the frame size in bytes */
 338         p_aout->output.i_nb_samples = FRAME_SIZE;
 339         aout_FormatPrepare( &p_aout->output.output );
 340         p_aout->output.p_sys->i_frame_size =
 341             FRAME_SIZE * p_aout->output.output.i_bytes_per_frame;
 342
 343         aout_VolumeSoftInit( p_aout );
 344     }
 345
 346     /* then launch the notification thread */
 347     msg_Dbg( p_aout, "creating DirectSoundThread" );
 348     if( vlc_thread_create( p_aout->output.p_sys->p_notif,
 349                            "DirectSound Notification Thread",
 350                            DirectSoundThread,
 351                            VLC_THREAD_PRIORITY_HIGHEST, VLC_FALSE ) )
 352     {
 353         msg_Err( p_aout, "cannot create DirectSoundThread" );
 354         goto error;
 355     }
 356
 357     vlc_object_attach( p_aout->output.p_sys->p_notif, p_aout );
 358
 359     return VLC_SUCCESS;
 360
 361  error:
 362     CloseAudio( VLC_OBJECT(p_aout) );
 363     return VLC_EGENERIC;
 364 }
 365
 366 /*****************************************************************************
 367  * Probe: probe the audio device for available formats and channels
 368  *****************************************************************************/
 369 static void Probe( aout_instance_t * p_aout )
 370 {
 371     vlc_value_t val, text;
 372     int i_format;
 373     unsigned int i_physical_channels;
 374     DWORD ui_speaker_config;
 375
 376     var_Create( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
 377     text.psz_string = _("Audio device");
 378     var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
 379
 380     /* Test for 5.1 support */
 381     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 382                           AOUT_CHAN_CENTER | AOUT_CHAN_REARLEFT |
 383                           AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE;
 384     if( p_aout->output.output.i_physical_channels == i_physical_channels )
 385     {
 386         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 6,
 387                                p_aout->output.output.i_rate, VLC_TRUE )
 388             == VLC_SUCCESS )
 389         {
 390             val.i_int = AOUT_VAR_5_1;
 391             text.psz_string = N_("5.1");
 392             var_Change( p_aout, "audio-device",
 393                         VLC_VAR_ADDCHOICE, &val, &text );
 394             msg_Dbg( p_aout, "device supports 5.1 channels" );
 395         }
 396     }
 397
 398     /* Test for 2 Front 2 Rear support */
 399     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT |
 400                           AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
 401     if( ( p_aout->output.output.i_physical_channels & i_physical_channels )
 402         == i_physical_channels )
 403     {
 404         if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 4,
 405                                p_aout->output.output.i_rate, VLC_TRUE )
 406             == VLC_SUCCESS )
 407         {
 408             val.i_int = AOUT_VAR_2F2R;
 409             text.psz_string = N_("2 Front 2 Rear");
 410             var_Change( p_aout, "audio-device",
 411                         VLC_VAR_ADDCHOICE, &val, &text );
 412             msg_Dbg( p_aout, "device supports 4 channels" );
 413         }
 414     }
 415
 416     /* Test for stereo support */
 417     i_physical_channels = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
 418     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 2,
 419                            p_aout->output.output.i_rate, VLC_TRUE )
 420         == VLC_SUCCESS )
 421     {
 422         val.i_int = AOUT_VAR_STEREO;
 423         text.psz_string = N_("Stereo");
 424         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 425         msg_Dbg( p_aout, "device supports 2 channels" );
 426     }
 427
 428     /* Test for mono support */
 429     i_physical_channels = AOUT_CHAN_CENTER;
 430     if( CreateDSBufferPCM( p_aout, &i_format, i_physical_channels, 1,
 431                            p_aout->output.output.i_rate, VLC_TRUE )
 432         == VLC_SUCCESS )
 433     {
 434         val.i_int = AOUT_VAR_MONO;
 435         text.psz_string = N_("Mono");
 436         var_Change( p_aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text );
 437         msg_Dbg( p_aout, "device supports 1 channel" );
 438     }
 439
 440     /* Check the speaker configuration to determine which channel config should
 441      * be the default */
 442     if FAILED( IDirectSound_GetSpeakerConfig( p_aout->output.p_sys->p_dsobject,
 443                                               &ui_speaker_config ) )
 444     {
 445         ui_speaker_config = DSSPEAKER_STEREO;
 446     }
 447     switch( DSSPEAKER_CONFIG(ui_speaker_config) )
 448     {
 449     case DSSPEAKER_5POINT1:
 450         val.i_int = AOUT_VAR_5_1;
 451         break;
 452     case DSSPEAKER_QUAD:
 453         val.i_int = AOUT_VAR_2F2R;
 454         break;
 455     case DSSPEAKER_MONO:
 456         val.i_int = AOUT_VAR_MONO;
 457         break;
 458     case DSSPEAKER_SURROUND:
 459     case DSSPEAKER_STEREO:
 460     default:
 461         val.i_int = AOUT_VAR_STEREO;
 462         break;
 463     }
 464     var_Set( p_aout, "audio-device", val );
 465
 466     /* Test for SPDIF support */
 467     if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
 468     {
 469         if( CreateDSBuffer( p_aout, VLC_FOURCC('s','p','d','i'),
 470                             p_aout->output.output.i_physical_channels,
 471                             aout_FormatNbChannels( &p_aout->output.output ),
 472                             p_aout->output.output.i_rate,
 473                             AOUT_SPDIF_SIZE, VLC_TRUE )
 474             == VLC_SUCCESS )
 475         {
 476             msg_Dbg( p_aout, "device supports A/52 over S/PDIF" );
 477             val.i_int = AOUT_VAR_SPDIF;
 478             text.psz_string = N_("A/52 over S/PDIF");
 479             var_Change( p_aout, "audio-device",
 480                         VLC_VAR_ADDCHOICE, &val, &text );
 481             if( config_GetInt( p_aout, "spdif" ) )
 482                 var_Set( p_aout, "audio-device", val );
 483         }
 484     }
 485
 486     var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
 487
 488     val.b_bool = VLC_TRUE;
 489     var_Set( p_aout, "intf-change", val );
 490 }
 491
 492 /*****************************************************************************
 493  * Play: we'll start playing the directsound buffer here because at least here
 494  *       we know the first buffer has been put in the aout fifo and we also
 495  *       know its date.
 496  *****************************************************************************/
 497 static void Play( aout_instance_t *p_aout )
 498 {
 499     if( !p_aout->output.p_sys->b_playing )
 500     {
 501         aout_buffer_t *p_buffer;
 502
 503         p_aout->output.p_sys->b_playing = 1;
 504
 505         /* get the playing date of the first aout buffer */
 506         p_aout->output.p_sys->p_notif->start_date =
 507             aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
 508
 509         /* fill in the first samples */
 510         p_buffer = aout_FifoPop( p_aout, &p_aout->output.fifo );
 511         FillBuffer( p_aout, 0, p_buffer );
 512
 513         /* wake up the audio output thread */
 514         SetEvent( p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 515     }
 516 }
 517
 518 /*****************************************************************************
 519  * CloseAudio: close the audio device
 520  *****************************************************************************/
 521 static void CloseAudio( vlc_object_t *p_this )
 522 {
 523     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 524
 525     msg_Dbg( p_aout, "CloseAudio" );
 526
 527     /* kill the position notification thread, if any */
 528     if( p_aout->output.p_sys->p_notif )
 529     {
 530         vlc_object_detach( p_aout->output.p_sys->p_notif );
 531         if( p_aout->output.p_sys->p_notif->b_thread )
 532         {
 533             p_aout->output.p_sys->p_notif->b_die = 1;
 534
 535             if( !p_aout->output.p_sys->b_playing )
 536                 /* wake up the audio thread */
 537                 SetEvent(
 538                     p_aout->output.p_sys->p_notif->p_events[0].hEventNotify );
 539
 540             vlc_thread_join( p_aout->output.p_sys->p_notif );
 541         }
 542         vlc_object_destroy( p_aout->output.p_sys->p_notif );
 543     }
 544
 545     /* release the secondary buffer */
 546     DestroyDSBuffer( p_aout );
 547
 548     /* finally release the DirectSound object */
 549     if( p_aout->output.p_sys->p_dsobject )
 550         IDirectSound_Release( p_aout->output.p_sys->p_dsobject );
 551
 552     /* free DSOUND.DLL */
 553     if( p_aout->output.p_sys->hdsound_dll )
 554        FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 555
 556     if( p_aout->output.p_sys->pi_chan_table )
 557         free( p_aout->output.p_sys->pi_chan_table );
 558
 559     free( p_aout->output.p_sys );
 560 }
 561
 562 /*****************************************************************************
 563  * InitDirectSound: handle all the gory details of DirectSound initialisation
 564  *****************************************************************************/
 565 static int InitDirectSound( aout_instance_t *p_aout )
 566 {
 567     HRESULT (WINAPI *OurDirectSoundCreate)(LPGUID, LPDIRECTSOUND *, LPUNKNOWN);
 568
 569     p_aout->output.p_sys->hdsound_dll = LoadLibrary("DSOUND.DLL");
 570     if( p_aout->output.p_sys->hdsound_dll == NULL )
 571     {
 572         msg_Warn( p_aout, "cannot open DSOUND.DLL" );
 573         goto error;
 574     }
 575
 576     OurDirectSoundCreate = (void *)GetProcAddress(
 577                                            p_aout->output.p_sys->hdsound_dll,
 578                                            "DirectSoundCreate" );
 579     if( OurDirectSoundCreate == NULL )
 580     {
 581         msg_Warn( p_aout, "GetProcAddress FAILED" );
 582         goto error;
 583     }
 584
 585     /* Create the direct sound object */
 586     if FAILED( OurDirectSoundCreate( NULL, &p_aout->output.p_sys->p_dsobject,
 587                                      NULL ) )
 588     {
 589         msg_Warn( p_aout, "cannot create a direct sound device" );
 590         goto error;
 591     }
 592
 593     /* Set DirectSound Cooperative level, ie what control we want over Windows
 594      * sound device. In our case, DSSCL_EXCLUSIVE means that we can modify the
 595      * settings of the primary buffer, but also that only the sound of our
 596      * application will be hearable when it will have the focus.
 597      * !!! (this is not really working as intended yet because to set the
 598      * cooperative level you need the window handle of your application, and
 599      * I don't know of any easy way to get it. Especially since we might play
 600      * sound without any video, and so what window handle should we use ???
 601      * The hack for now is to use the Desktop window handle - it seems to be
 602      * working */
 603     if( IDirectSound_SetCooperativeLevel( p_aout->output.p_sys->p_dsobject,
 604                                           GetDesktopWindow(),
 605                                           DSSCL_EXCLUSIVE) )
 606     {
 607         msg_Warn( p_aout, "cannot set direct sound cooperative level" );
 608     }
 609
 610     return VLC_SUCCESS;
 611
 612  error:
 613     p_aout->output.p_sys->p_dsobject = NULL;
 614     if( p_aout->output.p_sys->hdsound_dll )
 615     {
 616         FreeLibrary( p_aout->output.p_sys->hdsound_dll );
 617         p_aout->output.p_sys->hdsound_dll = NULL;
 618     }
 619     return VLC_EGENERIC;
 620
 621 }
 622
 623 /*****************************************************************************
 624  * CreateDSBuffer: Creates a direct sound buffer of the required format.
 625  *****************************************************************************
 626  * This function creates the buffer we'll use to play audio.
 627  * In DirectSound there are two kinds of buffers:
 628  * - the primary buffer: which is the actual buffer that the soundcard plays
 629  * - the secondary buffer(s): these buffers are the one actually used by
 630  *    applications and DirectSound takes care of mixing them into the primary.
 631  *
 632  * Once you create a secondary buffer, you cannot change its format anymore so
 633  * you have to release the current one and create another.
 634  *****************************************************************************/
 635 static int CreateDSBuffer( aout_instance_t *p_aout, int i_format,
 636                            int i_channels, int i_nb_channels, int i_rate,
 637                            int i_bytes_per_frame, vlc_bool_t b_probe )
 638 {
 639     WAVEFORMATEXTENSIBLE waveformat;
 640     DSBUFFERDESC         dsbdesc;
 641     unsigned int         i;
 642
 643     /* First set the sound buffer format */
 644     waveformat.dwChannelMask = 0;
 645     for( i = 0; i < sizeof(pi_channels_in)/sizeof(uint32_t); i++ )
 646     {
 647         if( i_channels & pi_channels_in[i] )
 648             waveformat.dwChannelMask |= pi_channels_out[i];
 649     }
 650
 651     switch( i_format )
 652     {
 653     case VLC_FOURCC('s','p','d','i'):
 654         i_nb_channels = 2;
 655         /* To prevent channel re-ordering */
 656         waveformat.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 657         waveformat.Format.wBitsPerSample = 16;
 658         waveformat.Samples.wValidBitsPerSample =
 659             waveformat.Format.wBitsPerSample;
 660         waveformat.Format.wFormatTag = WAVE_FORMAT_DOLBY_AC3_SPDIF;
 661         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_DOLBY_AC3_SPDIF;
 662         break;
 663
 664     case VLC_FOURCC('f','l','3','2'):
 665         waveformat.Format.wBitsPerSample = sizeof(float) * 8;
 666         waveformat.Samples.wValidBitsPerSample =
 667             waveformat.Format.wBitsPerSample;
 668         waveformat.Format.wFormatTag = WAVE_FORMAT_IEEE_FLOAT;
 669         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
 670         break;
 671
 672     case VLC_FOURCC('s','1','6','l'):
 673         waveformat.Format.wBitsPerSample = 16;
 674         waveformat.Samples.wValidBitsPerSample =
 675             waveformat.Format.wBitsPerSample;
 676         waveformat.Format.wFormatTag = WAVE_FORMAT_PCM;
 677         waveformat.SubFormat = _KSDATAFORMAT_SUBTYPE_PCM;
 678         break;
 679     }
 680
 681     waveformat.Format.nChannels = i_nb_channels;
 682     waveformat.Format.nSamplesPerSec = i_rate;
 683     waveformat.Format.nBlockAlign =
 684         waveformat.Format.wBitsPerSample / 8 * i_nb_channels;
 685     waveformat.Format.nAvgBytesPerSec =
 686         waveformat.Format.nSamplesPerSec * waveformat.Format.nBlockAlign;
 687
 688     /* Only use the new WAVE_FORMAT_EXTENSIBLE format for multichannel audio */
 689     if( i_nb_channels <= 2 )
 690     {
 691         waveformat.Format.cbSize = 0;
 692     }
 693     else
 694     {
 695         waveformat.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
 696         waveformat.Format.cbSize =
 697             sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
 698     }
 699
 700
 701     /* Then fill in the direct sound descriptor */
 702     memset(&dsbdesc, 0, sizeof(DSBUFFERDESC));
 703     dsbdesc.dwSize = sizeof(DSBUFFERDESC);
 704     dsbdesc.dwFlags = DSBCAPS_GETCURRENTPOSITION2/* Better position accuracy */
 705                     | DSBCAPS_CTRLPOSITIONNOTIFY     /* We need notification */
 706                     | DSBCAPS_GLOBALFOCUS;      /* Allows background playing */
 707     dsbdesc.dwBufferBytes = FRAMES_NUM * i_bytes_per_frame;   /* buffer size */
 708     dsbdesc.lpwfxFormat = (WAVEFORMATEX *)&waveformat;
 709
 710     if FAILED( IDirectSound_CreateSoundBuffer(
 711                    p_aout->output.p_sys->p_dsobject, &dsbdesc,
 712                    &p_aout->output.p_sys->p_dsbuffer, NULL) )
 713     {
 714         return VLC_EGENERIC;
 715     }
 716
 717     /* Stop here if we were just probing */
 718     if( b_probe )
 719     {
 720         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 721         p_aout->output.p_sys->p_dsbuffer = NULL;
 722         return VLC_SUCCESS;
 723     }
 724
 725     /* Backup the size of a frame */
 726     p_aout->output.p_sys->p_notif->i_frame_size = i_bytes_per_frame;
 727
 728     /* Now the secondary buffer is created, we need to setup its position
 729      * notification */
 730     for( i = 0; i < FRAMES_NUM; i++ )
 731     {
 732         p_aout->output.p_sys->p_notif->p_events[i].dwOffset = i *
 733             p_aout->output.p_sys->p_notif->i_frame_size;
 734
 735         p_aout->output.p_sys->p_notif->i_frame_status[i] = FRAME_EMPTY;
 736     }
 737
 738     /* Get the IDirectSoundNotify interface */
 739     if FAILED( IDirectSoundBuffer_QueryInterface(
 740                                 p_aout->output.p_sys->p_dsbuffer,
 741                                 &IID_IDirectSoundNotify,
 742                                 (LPVOID *)&p_aout->output.p_sys->p_dsnotify ) )
 743     {
 744         msg_Err( p_aout, "cannot get IDirectSoundNotify interface" );
 745         goto error;
 746     }
 747
 748     if FAILED( IDirectSoundNotify_SetNotificationPositions(
 749                                     p_aout->output.p_sys->p_dsnotify,
 750                                     FRAMES_NUM,
 751                                     p_aout->output.p_sys->p_notif->p_events ) )
 752     {
 753         msg_Err( p_aout, "cannot set position notification" );
 754         goto error;
 755     }
 756
 757     p_aout->output.p_sys->i_channel_mask = waveformat.dwChannelMask;
 758     CheckReordering( p_aout, i_nb_channels );
 759
 760     return VLC_SUCCESS;
 761
 762  error:
 763     DestroyDSBuffer( p_aout );
 764     return VLC_EGENERIC;
 765 }
 766
 767 /*****************************************************************************
 768  * CreateDSBufferPCM: creates a PCM direct sound buffer.
 769  *****************************************************************************
 770  * We first try to create a WAVE_FORMAT_IEEE_FLOAT buffer if supported by
 771  * the hardware, otherwise we create a WAVE_FORMAT_PCM buffer.
 772  ****************************************************************************/
 773 static int CreateDSBufferPCM( aout_instance_t *p_aout, int *i_format,
 774                               int i_channels, int i_nb_channels, int i_rate,
 775                               vlc_bool_t b_probe )
 776 {
 777     if( CreateDSBuffer( p_aout, VLC_FOURCC('f','l','3','2'),
 778                         i_channels, i_nb_channels, i_rate,
 779                         FRAME_SIZE * 4 * i_nb_channels, b_probe )
 780         != VLC_SUCCESS )
 781     {
 782         if ( CreateDSBuffer( p_aout, VLC_FOURCC('s','1','6','l'),
 783                              i_channels, i_nb_channels, i_rate,
 784                              FRAME_SIZE * 2 * i_nb_channels, b_probe )
 785              != VLC_SUCCESS )
 786         {
 787             return VLC_EGENERIC;
 788         }
 789         else
 790         {
 791             *i_format = VLC_FOURCC('s','1','6','l');
 792             return VLC_SUCCESS;
 793         }
 794     }
 795     else
 796     {
 797         *i_format = VLC_FOURCC('f','l','3','2');
 798         return VLC_SUCCESS;
 799     }
 800 }
 801
 802 /*****************************************************************************
 803  * DestroyDSBuffer
 804  *****************************************************************************
 805  * This function destroys the secondary buffer.
 806  *****************************************************************************/
 807 static void DestroyDSBuffer( aout_instance_t *p_aout )
 808 {
 809     if( p_aout->output.p_sys->p_dsnotify )
 810     {
 811         IDirectSoundNotify_Release( p_aout->output.p_sys->p_dsnotify );
 812         p_aout->output.p_sys->p_dsnotify = NULL;
 813     }
 814
 815     if( p_aout->output.p_sys->p_dsbuffer )
 816     {
 817         IDirectSoundBuffer_Release( p_aout->output.p_sys->p_dsbuffer );
 818         p_aout->output.p_sys->p_dsbuffer = NULL;
 819     }
 820 }
 821
 822 /*****************************************************************************
 823  * FillBuffer: Fill in one of the direct sound frame buffers.
 824  *****************************************************************************
 825  * Returns VLC_SUCCESS on success.
 826  *****************************************************************************/
 827 static int FillBuffer( aout_instance_t *p_aout, int i_frame,
 828                        aout_buffer_t *p_buffer )
 829 {
 830     notification_thread_t *p_notif = p_aout->output.p_sys->p_notif;
 831     void *p_write_position, *p_wrap_around;
 832     long l_bytes1, l_bytes2;
 833     HRESULT dsresult;
 834
 835     /* Before copying anything, we have to lock the buffer */
 836     dsresult = IDirectSoundBuffer_Lock(
 837                 p_aout->output.p_sys->p_dsbuffer,               /* DS buffer */
 838                 i_frame * p_notif->i_frame_size,             /* Start offset */
 839                 p_notif->i_frame_size,                    /* Number of bytes */
 840                 &p_write_position,                  /* Address of lock start */
 841                 &l_bytes1,       /* Count of bytes locked before wrap around */
 842                 &p_wrap_around,            /* Buffer adress (if wrap around) */
 843                 &l_bytes2,               /* Count of bytes after wrap around */
 844                 0 );                                                /* Flags */
 845     if( dsresult == DSERR_BUFFERLOST )
 846     {
 847         IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 848         dsresult = IDirectSoundBuffer_Lock(
 849                                p_aout->output.p_sys->p_dsbuffer,
 850                                i_frame * p_notif->i_frame_size,
 851                                p_notif->i_frame_size,
 852                                &p_write_position,
 853                                &l_bytes1,
 854                                &p_wrap_around,
 855                                &l_bytes2,
 856                                0 );
 857     }
 858     if( dsresult != DS_OK )
 859     {
 860         msg_Warn( p_notif, "cannot lock buffer" );
 861         if( p_buffer ) aout_BufferFree( p_buffer );
 862         return VLC_EGENERIC;
 863     }
 864
 865     if( p_buffer == NULL )
 866     {
 867         memset( p_write_position, 0, l_bytes1 );
 868     }
 869     else if( p_aout->output.p_sys->b_chan_reorder )
 870     {
 871         /* Do the channel reordering here */
 872
 873         if( p_aout->output.output.i_format ==  VLC_FOURCC('s','1','6','l') )
 874           InterleaveS16( (int16_t *)p_buffer->p_buffer,
 875                          (int16_t *)p_write_position,
 876                          p_aout->output.p_sys->pi_chan_table,
 877                          aout_FormatNbChannels( &p_aout->output.output ) );
 878         else
 879           InterleaveFloat32( (float *)p_buffer->p_buffer,
 880                              (float *)p_write_position,
 881                              p_aout->output.p_sys->pi_chan_table,
 882                              aout_FormatNbChannels( &p_aout->output.output ) );
 883     }
 884     else
 885     {
 886         p_aout->p_vlc->pf_memcpy( p_write_position, p_buffer->p_buffer,
 887                                   l_bytes1 );
 888         aout_BufferFree( p_buffer );
 889     }
 890
 891     /* Now the data has been copied, unlock the buffer */
 892     IDirectSoundBuffer_Unlock( p_aout->output.p_sys->p_dsbuffer,
 893                                p_write_position, l_bytes1,
 894                                p_wrap_around, l_bytes2 );
 895
 896     return VLC_SUCCESS;
 897 }
 898
 899 /*****************************************************************************
 900  * DirectSoundThread: this thread will capture play notification events.
 901  *****************************************************************************
 902  * We use this thread to emulate a callback mechanism. The thread probes for
 903  * event notification and fills up the DS secondary buffer when needed.
 904  *****************************************************************************/
 905 static void DirectSoundThread( notification_thread_t *p_notif )
 906 {
 907     HANDLE  notification_events[FRAMES_NUM];
 908     HRESULT dsresult;
 909     aout_instance_t *p_aout = p_notif->p_aout;
 910     int i, i_which_frame, i_last_frame, i_next_frame;
 911     mtime_t mtime;
 912     vlc_bool_t b_sleek;
 913
 914     for( i = 0; i < FRAMES_NUM; i++ )
 915         notification_events[i] = p_notif->p_events[i].hEventNotify;
 916
 917     /* We don't want any resampling when using S/PDIF output */
 918     b_sleek = p_aout->output.output.i_format == VLC_FOURCC('s','p','d','i');
 919
 920     /* Tell the main thread that we are ready */
 921     vlc_thread_ready( p_notif );
 922
 923     msg_Dbg( p_notif, "DirectSoundThread ready" );
 924
 925     /* Wait here until Play() is called */
 926     WaitForSingleObject( notification_events[0], INFINITE );
 927
 928     if( !p_notif->b_die )
 929     {
 930         mwait( p_notif->start_date - AOUT_PTS_TOLERANCE / 2 );
 931
 932         /* start playing the buffer */
 933         dsresult = IDirectSoundBuffer_Play( p_aout->output.p_sys->p_dsbuffer,
 934                                         0,                         /* Unused */
 935                                         0,                         /* Unused */
 936                                         DSBPLAY_LOOPING );          /* Flags */
 937         if( dsresult == DSERR_BUFFERLOST )
 938         {
 939             IDirectSoundBuffer_Restore( p_aout->output.p_sys->p_dsbuffer );
 940             dsresult = IDirectSoundBuffer_Play(
 941                                             p_aout->output.p_sys->p_dsbuffer,
 942                                             0,                     /* Unused */
 943                                             0,                     /* Unused */
 944                                             DSBPLAY_LOOPING );      /* Flags */
 945         }
 946         if( dsresult != DS_OK )
 947         {
 948             msg_Err( p_aout, "cannot start playing buffer" );
 949         }
 950     }
 951
 952     while( !p_notif->b_die )
 953     {
 954         aout_buffer_t *p_buffer;
 955         long l_latency;
 956
 957         /* wait for the position notification */
 958         i_which_frame = WaitForMultipleObjects( FRAMES_NUM,
 959                                                 notification_events, 0,
 960                                                 INFINITE ) - WAIT_OBJECT_0;
 961
 962         if( p_notif->b_die )
 963             break;
 964
 965         mtime = mdate();
 966
 967         /* We take into account the current latency */
 968         if SUCCEEDED( IDirectSoundBuffer_GetCurrentPosition(
 969                         p_aout->output.p_sys->p_dsbuffer,
 970                         &l_latency, NULL ) )
 971         {
 972             if( l_latency > (i_which_frame * FRAME_SIZE)
 973                   && l_latency < ((i_which_frame+1) * FRAME_SIZE) )
 974             {
 975                 l_latency = - ( l_latency /
 976                                 p_aout->output.output.i_bytes_per_frame %
 977                                 FRAME_SIZE );
 978             }
 979             else
 980             {
 981                 l_latency = FRAME_SIZE - ( l_latency /
 982                                       p_aout->output.output.i_bytes_per_frame %
 983                                       FRAME_SIZE );
 984             }
 985         }
 986         else
 987         {
 988             l_latency = 0;
 989         }
 990
 991         /* Mark last frame as empty */
 992         i_last_frame = (i_which_frame + FRAMES_NUM -1) % FRAMES_NUM;
 993         i_next_frame = (i_which_frame + 1) % FRAMES_NUM;
 994         p_notif->i_frame_status[i_last_frame] = FRAME_EMPTY;
 995
 996         /* Try to fill in as many frame buffers as possible */
 997         for( i = i_next_frame; (i % FRAMES_NUM) != i_which_frame; i++ )
 998         {
 999
1000             /* Check if frame buf is already filled */
1001             if( p_notif->i_frame_status[i % FRAMES_NUM] == FRAME_QUEUED )
1002                 continue;
1003
1004             p_buffer = aout_OutputNextBuffer( p_aout,
1005                 mtime + 1000000 / p_aout->output.output.i_rate *
1006                 ((i - i_next_frame + 1) * FRAME_SIZE + l_latency), b_sleek );
1007
1008             /* If there is no audio data available and we have some buffered
1009              * already, then just wait for the next time */
1010             if( !p_buffer && (i != i_next_frame) )
1011             {
1012                 //msg_Err( p_aout, "only %i frame buffers filled!",
1013                 //         i - i_next_frame );
1014                 break;
1015             }
1016
1017             if( FillBuffer( p_aout, (i%FRAMES_NUM), p_buffer )
1018                 != VLC_SUCCESS )
1019                 break;
1020
1021             /* Mark the frame buffer as QUEUED */
1022             p_notif->i_frame_status[i%FRAMES_NUM] = FRAME_QUEUED;
1023         }
1024
1025     }
1026
1027     /* make sure the buffer isn't playing */
1028     IDirectSoundBuffer_Stop( p_aout->output.p_sys->p_dsbuffer );
1029
1030     /* free the events */
1031     for( i = 0; i < FRAMES_NUM; i++ )
1032         CloseHandle( notification_events[i] );
1033
1034     msg_Dbg( p_notif, "DirectSoundThread exiting" );
1035 }
1036
1037 /*****************************************************************************
1038  * CheckReordering: Check if we need to do some channel re-ordering (the ac3
1039  *                  channel order is different from the one chosen by
1040  *                  Microsoft).
1041  *****************************************************************************/
1042 static void CheckReordering( aout_instance_t *p_aout, int i_nb_channels )
1043 {
1044     int i, j, k, l;
1045
1046 #define i_channel_mask p_aout->output.p_sys->i_channel_mask
1047 #define pi_chan_table p_aout->output.p_sys->pi_chan_table
1048
1049     p_aout->output.p_sys->b_chan_reorder = VLC_FALSE;
1050
1051     pi_chan_table = malloc( i_nb_channels * sizeof(int) );
1052     if( !pi_chan_table )
1053     {
1054         return;
1055     }
1056
1057     for( i = 0, j = 0;
1058          i < (int)(sizeof(pi_channels_out)/sizeof(uint32_t)); i++ )
1059     {
1060         if( i_channel_mask & pi_channels_out[i] )
1061         {
1062             for( k = 0, l = 0;
1063                  pi_channels_out[i] != pi_channels_ordered[k]; k++ )
1064             {
1065                 if( i_channel_mask & pi_channels_ordered[k] )
1066                 {
1067                     l++;
1068                 }
1069             }
1070
1071             pi_chan_table[j] = l;
1072
1073             j++;
1074         }
1075     }
1076
1077     for( i = 0; i < i_nb_channels; i++ )
1078     {
1079         if( pi_chan_table[i] != i )
1080         {
1081             p_aout->output.p_sys->b_chan_reorder = VLC_TRUE;
1082         }
1083     }
1084
1085     if( p_aout->output.p_sys->b_chan_reorder )
1086     {
1087         msg_Dbg( p_aout, "channel reordering needed" );
1088     }
1089
1090 #undef pi_chan_table
1091 #undef waveformat
1092 }
1093
1094 /*****************************************************************************
1095  * InterleaveFloat32/S16: change the channel order to the Microsoft one.
1096  *****************************************************************************/
1097 static void InterleaveFloat32( float *p_buf, float *p_buf_out,
1098                                int *pi_chan_table, int i_nb_channels )
1099 {
1100     int i, j;
1101
1102     for( i = 0; i < FRAME_SIZE; i++ )
1103     {
1104         for( j = 0; j < i_nb_channels; j++ )
1105         {
1106             p_buf_out[i*i_nb_channels + pi_chan_table[j]] =
1107                 p_buf[i*i_nb_channels + j];
1108         }
1109     }
1110 }
1111
1112 static void InterleaveS16( int16_t *p_buf, int16_t *p_buf_out,
1113                            int *pi_chan_table, int i_nb_channels )
1114 {
1115     int i, j;
1116
1117     for( i = 0; i < FRAME_SIZE; i++ )
1118     {
1119         for( j = 0; j < i_nb_channels; j++ )
1120         {
1121             p_buf_out[ i*i_nb_channels + pi_chan_table[j]] =
1122                 p_buf[i*i_nb_channels + j];
1123         }
1124     }
1125 }