src/audio_output/common.c

   1 /*****************************************************************************
   2  * common.c : audio output management of common data structures
   3  *****************************************************************************
   4  * Copyright (C) 2002-2007 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <assert.h>
  32
  33 #include <vlc_common.h>
  34 #include <vlc_aout.h>
  35 #include "aout_internal.h"
  36 #include "libvlc.h"
  37
  38 /*
  39  * Instances management (internal and external)
  40  */
  41
  42 #define AOUT_ASSERT_FIFO_LOCKED aout_assert_fifo_locked(p_aout, p_fifo)
  43 static inline void aout_assert_fifo_locked( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
  44 {
  45 #ifndef NDEBUG
  46     if( !p_aout )
  47         return;
  48
  49     if( p_fifo == &p_aout->output.fifo )
  50         vlc_assert_locked( &p_aout->output_fifo_lock );
  51     else
  52     {
  53         int i;
  54         for( i = 0; i < p_aout->i_nb_inputs; i++ )
  55         {
  56             if( p_fifo == &p_aout->pp_inputs[i]->mixer.fifo)
  57             {
  58                 vlc_assert_locked( &p_aout->input_fifos_lock );
  59                 break;
  60             }
  61         }
  62         if( i == p_aout->i_nb_inputs )
  63             vlc_assert_locked( &p_aout->mixer_lock );
  64     }
  65 #else
  66     (void)p_aout;
  67     (void)p_fifo;
  68 #endif
  69 }
  70
  71 /* Local functions */
  72 static void aout_Destructor( vlc_object_t * p_this );
  73
  74 /*****************************************************************************
  75  * aout_New: initialize aout structure
  76  *****************************************************************************/
  77 aout_instance_t * __aout_New( vlc_object_t * p_parent )
  78 {
  79     aout_instance_t * p_aout;
  80
  81     /* Allocate descriptor. */
  82     p_aout = vlc_custom_create( p_parent, sizeof( *p_aout ), VLC_OBJECT_AOUT,
  83                                 "audio output" );
  84     if( p_aout == NULL )
  85     {
  86         return NULL;
  87     }
  88
  89     /* Initialize members. */
  90     vlc_mutex_init( &p_aout->input_fifos_lock );
  91     vlc_mutex_init( &p_aout->mixer_lock );
  92     vlc_mutex_init( &p_aout->volume_vars_lock );
  93     vlc_mutex_init( &p_aout->output_fifo_lock );
  94     p_aout->i_nb_inputs = 0;
  95     p_aout->mixer_multiplier = 1.0;
  96     p_aout->p_mixer = NULL;
  97     p_aout->output.b_error = 1;
  98     p_aout->output.b_starving = 1;
  99
 100     var_Create( p_aout, "intf-change", VLC_VAR_BOOL );
 101     var_SetBool( p_aout, "intf-change", true );
 102
 103     vlc_object_set_destructor( p_aout, aout_Destructor );
 104
 105     vlc_object_attach( p_aout, p_parent );
 106
 107     return p_aout;
 108 }
 109
 110 /*****************************************************************************
 111  * aout_Destructor: destroy aout structure
 112  *****************************************************************************/
 113 static void aout_Destructor( vlc_object_t * p_this )
 114 {
 115     aout_instance_t * p_aout = (aout_instance_t *)p_this;
 116     vlc_mutex_destroy( &p_aout->input_fifos_lock );
 117     vlc_mutex_destroy( &p_aout->mixer_lock );
 118     vlc_mutex_destroy( &p_aout->volume_vars_lock );
 119     vlc_mutex_destroy( &p_aout->output_fifo_lock );
 120 }
 121
 122 /* Lock ordering rules:
 123  *
 124  *            Vars Mixer Input IFIFO OFIFO (< Inner lock)
 125  * Vars        No!   Yes   Yes   Yes   Yes
 126  * Mixer       No!   No!   Yes   Yes   Yes
 127  * Input       No!   No!   No!   Yes   Yes
 128  * In FIFOs    No!   No!   No!   No!   Yes
 129  * Out FIFOs   No!   No!   No!   No!   No!
 130  * (^ Outer lock)
 131  */
 132 #ifdef AOUT_DEBUG
 133 /* Lock debugging */
 134 static __thread unsigned aout_locks = 0;
 135
 136 void aout_lock (unsigned i)
 137 {
 138     unsigned allowed;
 139     switch (i)
 140     {
 141         case VOLUME_VARS_LOCK:
 142             allowed = 0;
 143             break;
 144         case MIXER_LOCK:
 145             allowed = VOLUME_VARS_LOCK;
 146             break;
 147         case INPUT_LOCK:
 148             allowed = VOLUME_VARS_LOCK|MIXER_LOCK;
 149             break;
 150         case INPUT_FIFO_LOCK:
 151             allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK;
 152             break;
 153         case OUTPUT_FIFO_LOCK:
 154             allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK|INPUT_FIFO_LOCK;
 155             break;
 156         default:
 157             abort ();
 158     }
 159
 160     if (aout_locks & ~allowed)
 161     {
 162         fprintf (stderr, "Illegal audio lock transition (%x -> %x)\n",
 163                  aout_locks, aout_locks|i);
 164         vlc_backtrace ();
 165         abort ();
 166     }
 167     aout_locks |= i;
 168 }
 169
 170 void aout_unlock (unsigned i)
 171 {
 172     assert (aout_locks & i);
 173     aout_locks &= ~i;
 174 }
 175 #endif
 176
 177 /*
 178  * Formats management (internal and external)
 179  */
 180
 181 /*****************************************************************************
 182  * aout_FormatNbChannels : return the number of channels
 183  *****************************************************************************/
 184 unsigned int aout_FormatNbChannels( const audio_sample_format_t * p_format )
 185 {
 186     static const uint32_t pi_channels[] =
 187         { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
 188           AOUT_CHAN_REARCENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
 189           AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_LFE };
 190     unsigned int i_nb = 0, i;
 191
 192     for ( i = 0; i < sizeof(pi_channels)/sizeof(uint32_t); i++ )
 193     {
 194         if ( p_format->i_physical_channels & pi_channels[i] ) i_nb++;
 195     }
 196
 197     return i_nb;
 198 }
 199
 200 /*****************************************************************************
 201  * aout_BitsPerSample : get the number of bits per sample
 202  *****************************************************************************/
 203 unsigned int aout_BitsPerSample( vlc_fourcc_t i_format )
 204 {
 205     switch( vlc_fourcc_GetCodec( AUDIO_ES, i_format ) )
 206     {
 207     case VLC_CODEC_U8:
 208     case VLC_CODEC_S8:
 209         return 8;
 210
 211     case VLC_CODEC_U16L:
 212     case VLC_CODEC_S16L:
 213     case VLC_CODEC_U16B:
 214     case VLC_CODEC_S16B:
 215         return 16;
 216
 217     case VLC_CODEC_U24L:
 218     case VLC_CODEC_S24L:
 219     case VLC_CODEC_U24B:
 220     case VLC_CODEC_S24B:
 221         return 24;
 222
 223     case VLC_CODEC_S32L:
 224     case VLC_CODEC_S32B:
 225     case VLC_CODEC_F32L:
 226     case VLC_CODEC_F32B:
 227     case VLC_CODEC_FI32:
 228         return 32;
 229
 230     case VLC_CODEC_F64L:
 231     case VLC_CODEC_F64B:
 232         return 64;
 233
 234     default:
 235         /* For these formats the caller has to indicate the parameters
 236          * by hand. */
 237         return 0;
 238     }
 239 }
 240
 241 /*****************************************************************************
 242  * aout_FormatPrepare : compute the number of bytes per frame & frame length
 243  *****************************************************************************/
 244 void aout_FormatPrepare( audio_sample_format_t * p_format )
 245 {
 246     p_format->i_channels = aout_FormatNbChannels( p_format );
 247     p_format->i_bitspersample = aout_BitsPerSample( p_format->i_format );
 248     if( p_format->i_bitspersample > 0 )
 249     {
 250         p_format->i_bytes_per_frame = ( p_format->i_bitspersample / 8 )
 251                                     * aout_FormatNbChannels( p_format );
 252         p_format->i_frame_length = 1;
 253     }
 254 }
 255
 256 /*****************************************************************************
 257  * aout_FormatPrintChannels : print a channel in a human-readable form
 258  *****************************************************************************/
 259 const char * aout_FormatPrintChannels( const audio_sample_format_t * p_format )
 260 {
 261     switch ( p_format->i_physical_channels & AOUT_CHAN_PHYSMASK )
 262     {
 263     case AOUT_CHAN_LEFT:
 264     case AOUT_CHAN_RIGHT:
 265     case AOUT_CHAN_CENTER:
 266         if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
 267               || (p_format->i_original_channels
 268                    & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
 269             return "Mono";
 270         else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
 271             return "Left";
 272         return "Right";
 273     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
 274         if ( p_format->i_original_channels & AOUT_CHAN_REVERSESTEREO )
 275         {
 276             if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
 277                 return "Dolby/Reverse";
 278             return "Stereo/Reverse";
 279         }
 280         else
 281         {
 282             if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
 283                 return "Dolby";
 284             else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
 285                 return "Dual-mono";
 286             else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
 287                 return "Stereo/Mono";
 288             else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
 289                 return "Stereo/Left";
 290             else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
 291                 return "Stereo/Right";
 292             return "Stereo";
 293         }
 294     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
 295         return "3F";
 296     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
 297         return "2F1R";
 298     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 299           | AOUT_CHAN_REARCENTER:
 300         return "3F1R";
 301     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 302           | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
 303         return "2F2R";
 304     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 305           | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
 306         return "2F2M";
 307     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 308           | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
 309         return "3F2R";
 310     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 311           | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
 312         return "3F2M";
 313
 314     case AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
 315         if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
 316               || (p_format->i_original_channels
 317                    & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
 318             return "Mono/LFE";
 319         else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
 320             return "Left/LFE";
 321         return "Right/LFE";
 322     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE:
 323         if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
 324             return "Dolby/LFE";
 325         else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
 326             return "Dual-mono/LFE";
 327         else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
 328             return "Mono/LFE";
 329         else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
 330             return "Stereo/Left/LFE";
 331         else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
 332             return "Stereo/Right/LFE";
 333          return "Stereo/LFE";
 334     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
 335         return "3F/LFE";
 336     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER
 337           | AOUT_CHAN_LFE:
 338         return "2F1R/LFE";
 339     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 340           | AOUT_CHAN_REARCENTER | AOUT_CHAN_LFE:
 341         return "3F1R/LFE";
 342     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 343           | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
 344         return "2F2R/LFE";
 345     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
 346           | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
 347         return "2F2M/LFE";
 348     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 349           | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
 350         return "3F2R/LFE";
 351     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 352           | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
 353         return "3F2M/LFE";
 354     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 355           | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
 356           | AOUT_CHAN_MIDDLERIGHT:
 357         return "3F2M2R";
 358     case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
 359           | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
 360           | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
 361         return "3F2M2R/LFE";
 362     }
 363
 364     return "ERROR";
 365 }
 366
 367 /*****************************************************************************
 368  * aout_FormatPrint : print a format in a human-readable form
 369  *****************************************************************************/
 370 void aout_FormatPrint( aout_instance_t * p_aout, const char * psz_text,
 371                        const audio_sample_format_t * p_format )
 372 {
 373     msg_Dbg( p_aout, "%s '%4.4s' %d Hz %s frame=%d samples/%d bytes", psz_text,
 374              (char *)&p_format->i_format, p_format->i_rate,
 375              aout_FormatPrintChannels( p_format ),
 376              p_format->i_frame_length, p_format->i_bytes_per_frame );
 377 }
 378
 379 /*****************************************************************************
 380  * aout_FormatsPrint : print two formats in a human-readable form
 381  *****************************************************************************/
 382 void aout_FormatsPrint( aout_instance_t * p_aout, const char * psz_text,
 383                         const audio_sample_format_t * p_format1,
 384                         const audio_sample_format_t * p_format2 )
 385 {
 386     msg_Dbg( p_aout, "%s '%4.4s'->'%4.4s' %d Hz->%d Hz %s->%s",
 387              psz_text,
 388              (char *)&p_format1->i_format, (char *)&p_format2->i_format,
 389              p_format1->i_rate, p_format2->i_rate,
 390              aout_FormatPrintChannels( p_format1 ),
 391              aout_FormatPrintChannels( p_format2 ) );
 392 }
 393
 394
 395 /*
 396  * FIFO management (internal) - please understand that solving race conditions
 397  * is _your_ job, ie. in the audio output you should own the mixer lock
 398  * before calling any of these functions.
 399  */
 400
 401 /*****************************************************************************
 402  * aout_FifoInit : initialize the members of a FIFO
 403  *****************************************************************************/
 404 void aout_FifoInit( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
 405                     uint32_t i_rate )
 406 {
 407     AOUT_ASSERT_FIFO_LOCKED;
 408
 409     if( i_rate == 0 )
 410     {
 411         msg_Err( p_aout, "initialising fifo with zero divider" );
 412     }
 413
 414     p_fifo->p_first = NULL;
 415     p_fifo->pp_last = &p_fifo->p_first;
 416     date_Init( &p_fifo->end_date, i_rate, 1 );
 417 }
 418
 419 /*****************************************************************************
 420  * aout_FifoPush : push a packet into the FIFO
 421  *****************************************************************************/
 422 void aout_FifoPush( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
 423                     aout_buffer_t * p_buffer )
 424 {
 425     (void)p_aout;
 426     AOUT_ASSERT_FIFO_LOCKED;
 427
 428     *p_fifo->pp_last = p_buffer;
 429     p_fifo->pp_last = &p_buffer->p_next;
 430     *p_fifo->pp_last = NULL;
 431     /* Enforce the continuity of the stream. */
 432     if ( date_Get( &p_fifo->end_date ) )
 433     {
 434         p_buffer->i_pts = date_Get( &p_fifo->end_date );
 435         p_buffer->i_length = date_Increment( &p_fifo->end_date,
 436                                              p_buffer->i_nb_samples );
 437         p_buffer->i_length -= p_buffer->i_pts;
 438     }
 439     else
 440     {
 441         date_Set( &p_fifo->end_date, p_buffer->i_pts + p_buffer->i_length );
 442     }
 443 }
 444
 445 /*****************************************************************************
 446  * aout_FifoSet : set end_date and trash all buffers (because they aren't
 447  * properly dated)
 448  *****************************************************************************/
 449 void aout_FifoSet( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
 450                    mtime_t date )
 451 {
 452     aout_buffer_t * p_buffer;
 453     (void)p_aout;
 454     AOUT_ASSERT_FIFO_LOCKED;
 455
 456     date_Set( &p_fifo->end_date, date );
 457     p_buffer = p_fifo->p_first;
 458     while ( p_buffer != NULL )
 459     {
 460         aout_buffer_t * p_next = p_buffer->p_next;
 461         aout_BufferFree( p_buffer );
 462         p_buffer = p_next;
 463     }
 464     p_fifo->p_first = NULL;
 465     p_fifo->pp_last = &p_fifo->p_first;
 466 }
 467
 468 /*****************************************************************************
 469  * aout_FifoMoveDates : Move forwards or backwards all dates in the FIFO
 470  *****************************************************************************/
 471 void aout_FifoMoveDates( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
 472                          mtime_t difference )
 473 {
 474     aout_buffer_t * p_buffer;
 475     (void)p_aout;
 476     AOUT_ASSERT_FIFO_LOCKED;
 477
 478     date_Move( &p_fifo->end_date, difference );
 479     p_buffer = p_fifo->p_first;
 480     while ( p_buffer != NULL )
 481     {
 482         p_buffer->i_pts += difference;
 483         p_buffer = p_buffer->p_next;
 484     }
 485 }
 486
 487 /*****************************************************************************
 488  * aout_FifoNextStart : return the current end_date
 489  *****************************************************************************/
 490 mtime_t aout_FifoNextStart( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
 491 {
 492     (void)p_aout;
 493     AOUT_ASSERT_FIFO_LOCKED;
 494     return date_Get( &p_fifo->end_date );
 495 }
 496
 497 /*****************************************************************************
 498  * aout_FifoFirstDate : return the playing date of the first buffer in the
 499  * FIFO
 500  *****************************************************************************/
 501 mtime_t aout_FifoFirstDate( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
 502 {
 503     (void)p_aout;
 504     AOUT_ASSERT_FIFO_LOCKED;
 505     return p_fifo->p_first ?  p_fifo->p_first->i_pts : 0;
 506 }
 507
 508 /*****************************************************************************
 509  * aout_FifoPop : get the next buffer out of the FIFO
 510  *****************************************************************************/
 511 aout_buffer_t * aout_FifoPop( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
 512 {
 513     aout_buffer_t * p_buffer;
 514     (void)p_aout;
 515     AOUT_ASSERT_FIFO_LOCKED;
 516
 517     p_buffer = p_fifo->p_first;
 518     if ( p_buffer == NULL ) return NULL;
 519     p_fifo->p_first = p_buffer->p_next;
 520     if ( p_fifo->p_first == NULL )
 521     {
 522         p_fifo->pp_last = &p_fifo->p_first;
 523     }
 524
 525     return p_buffer;
 526 }
 527
 528 /*****************************************************************************
 529  * aout_FifoDestroy : destroy a FIFO and its buffers
 530  *****************************************************************************/
 531 void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
 532 {
 533     aout_buffer_t * p_buffer;
 534     (void)p_aout;
 535     AOUT_ASSERT_FIFO_LOCKED;
 536
 537     p_buffer = p_fifo->p_first;
 538     while ( p_buffer != NULL )
 539     {
 540         aout_buffer_t * p_next = p_buffer->p_next;
 541         aout_BufferFree( p_buffer );
 542         p_buffer = p_next;
 543     }
 544
 545     p_fifo->p_first = NULL;
 546     p_fifo->pp_last = &p_fifo->p_first;
 547 }
 548
 549 /*****************************************************************************
 550  * aout_CheckChannelReorder : Check if we need to do some channel re-ordering
 551  *****************************************************************************/
 552 int aout_CheckChannelReorder( const uint32_t *pi_chan_order_in,
 553                               const uint32_t *pi_chan_order_out,
 554                               uint32_t i_channel_mask,
 555                               int i_channels, int *pi_chan_table )
 556 {
 557     bool b_chan_reorder = false;
 558     int i, j, k, l;
 559
 560     if( i_channels > AOUT_CHAN_MAX )
 561         return false;
 562
 563     if( pi_chan_order_in == NULL )
 564         pi_chan_order_in = pi_vlc_chan_order_wg4;
 565     if( pi_chan_order_out == NULL )
 566         pi_chan_order_out = pi_vlc_chan_order_wg4;
 567
 568     for( i = 0, j = 0; pi_chan_order_in[i]; i++ )
 569     {
 570         if( !(i_channel_mask & pi_chan_order_in[i]) ) continue;
 571
 572         for( k = 0, l = 0; pi_chan_order_in[i] != pi_chan_order_out[k]; k++ )
 573         {
 574             if( i_channel_mask & pi_chan_order_out[k] ) l++;
 575         }
 576
 577         pi_chan_table[j++] = l;
 578     }
 579
 580     for( i = 0; i < i_channels; i++ )
 581     {
 582         if( pi_chan_table[i] != i ) b_chan_reorder = true;
 583     }
 584
 585     return b_chan_reorder;
 586 }
 587
 588 /*****************************************************************************
 589  * aout_ChannelReorder :
 590  *****************************************************************************/
 591 void aout_ChannelReorder( uint8_t *p_buf, int i_buffer,
 592                           int i_channels, const int *pi_chan_table,
 593                           int i_bits_per_sample )
 594 {
 595     uint8_t p_tmp[AOUT_CHAN_MAX * 4];
 596     int i, j;
 597
 598     if( i_bits_per_sample == 8 )
 599     {
 600         for( i = 0; i < i_buffer / i_channels; i++ )
 601         {
 602             for( j = 0; j < i_channels; j++ )
 603             {
 604                 p_tmp[pi_chan_table[j]] = p_buf[j];
 605             }
 606
 607             memcpy( p_buf, p_tmp, i_channels );
 608             p_buf += i_channels;
 609         }
 610     }
 611     else if( i_bits_per_sample == 16 )
 612     {
 613         for( i = 0; i < i_buffer / i_channels / 2; i++ )
 614         {
 615             for( j = 0; j < i_channels; j++ )
 616             {
 617                 p_tmp[2 * pi_chan_table[j]]     = p_buf[2 * j];
 618                 p_tmp[2 * pi_chan_table[j] + 1] = p_buf[2 * j + 1];
 619             }
 620
 621             memcpy( p_buf, p_tmp, 2 * i_channels );
 622             p_buf += 2 * i_channels;
 623         }
 624     }
 625     else if( i_bits_per_sample == 24 )
 626     {
 627         for( i = 0; i < i_buffer / i_channels / 3; i++ )
 628         {
 629             for( j = 0; j < i_channels; j++ )
 630             {
 631                 p_tmp[3 * pi_chan_table[j]]     = p_buf[3 * j];
 632                 p_tmp[3 * pi_chan_table[j] + 1] = p_buf[3 * j + 1];
 633                 p_tmp[3 * pi_chan_table[j] + 2] = p_buf[3 * j + 2];
 634             }
 635
 636             memcpy( p_buf, p_tmp, 3 * i_channels );
 637             p_buf += 3 * i_channels;
 638         }
 639     }
 640     else if( i_bits_per_sample == 32 )
 641     {
 642         for( i = 0; i < i_buffer / i_channels / 4; i++ )
 643         {
 644             for( j = 0; j < i_channels; j++ )
 645             {
 646                 p_tmp[4 * pi_chan_table[j]]     = p_buf[4 * j];
 647                 p_tmp[4 * pi_chan_table[j] + 1] = p_buf[4 * j + 1];
 648                 p_tmp[4 * pi_chan_table[j] + 2] = p_buf[4 * j + 2];
 649                 p_tmp[4 * pi_chan_table[j] + 3] = p_buf[4 * j + 3];
 650             }
 651
 652             memcpy( p_buf, p_tmp, 4 * i_channels );
 653             p_buf += 4 * i_channels;
 654         }
 655     }
 656 }
 657
 658 /*****************************************************************************
 659  * aout_ChannelExtract:
 660  *****************************************************************************/
 661 static inline void ExtractChannel( uint8_t *pi_dst, int i_dst_channels,
 662                                    const uint8_t *pi_src, int i_src_channels,
 663                                    int i_sample_count,
 664                                    const int *pi_selection, int i_bytes )
 665 {
 666     for( int i = 0; i < i_sample_count; i++ )
 667     {
 668         for( int j = 0; j < i_dst_channels; j++ )
 669             memcpy( &pi_dst[j * i_bytes], &pi_src[pi_selection[j] * i_bytes], i_bytes );
 670         pi_dst += i_dst_channels * i_bytes;
 671         pi_src += i_src_channels * i_bytes;
 672     }
 673 }
 674
 675 void aout_ChannelExtract( void *p_dst, int i_dst_channels,
 676                           const void *p_src, int i_src_channels,
 677                           int i_sample_count, const int *pi_selection, int i_bits_per_sample )
 678 {
 679     /* It does not work in place */
 680     assert( p_dst != p_src );
 681
 682     /* Force the compiler to inline for the specific cases so it can optimize */
 683     if( i_bits_per_sample == 8 )
 684         ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 1 );
 685     else  if( i_bits_per_sample == 16 )
 686         ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 2 );
 687     else  if( i_bits_per_sample == 24 )
 688         ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 3 );
 689     else  if( i_bits_per_sample == 32 )
 690         ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 4 );
 691     else  if( i_bits_per_sample == 64 )
 692         ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 8 );
 693 }
 694
 695 bool aout_CheckChannelExtraction( int *pi_selection,
 696                                   uint32_t *pi_layout, int *pi_channels,
 697                                   const uint32_t pi_order_dst[AOUT_CHAN_MAX],
 698                                   const uint32_t *pi_order_src, int i_channels )
 699 {
 700     const uint32_t pi_order_dual_mono[] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT };
 701     uint32_t i_layout = 0;
 702     int i_out = 0;
 703     int pi_index[AOUT_CHAN_MAX];
 704
 705     /* */
 706     if( !pi_order_dst )
 707         pi_order_dst = pi_vlc_chan_order_wg4;
 708
 709     /* Detect special dual mono case */
 710     if( i_channels == 2 &&
 711         pi_order_src[0] == AOUT_CHAN_CENTER && pi_order_src[1] == AOUT_CHAN_CENTER )
 712     {
 713         i_layout |= AOUT_CHAN_DUALMONO;
 714         pi_order_src = pi_order_dual_mono;
 715     }
 716
 717     /* */
 718     for( int i = 0; i < i_channels; i++ )
 719     {
 720         /* Ignore unknown or duplicated channels or not present in output */
 721         if( !pi_order_src[i] || (i_layout & pi_order_src[i]) )
 722             continue;
 723
 724         for( int j = 0; j < AOUT_CHAN_MAX; j++ )
 725         {
 726             if( pi_order_dst[j] == pi_order_src[i] )
 727             {
 728                 assert( i_out < AOUT_CHAN_MAX );
 729                 pi_index[i_out++] = i;
 730                 i_layout |= pi_order_src[i];
 731                 break;
 732             }
 733         }
 734     }
 735
 736     /* */
 737     for( int i = 0, j = 0; i < AOUT_CHAN_MAX; i++ )
 738     {
 739         for( int k = 0; k < i_out; k++ )
 740         {
 741             if( pi_order_dst[i] == pi_order_src[pi_index[k]] )
 742             {
 743                 pi_selection[j++] = pi_index[k];
 744                 break;
 745             }
 746         }
 747     }
 748
 749     *pi_layout = i_layout;
 750     *pi_channels = i_out;
 751
 752     for( int i = 0; i < i_out; i++ )
 753     {
 754         if( pi_selection[i] != i )
 755             return true;
 756     }
 757     return i_out == i_channels;
 758 }
 759
 760 /*****************************************************************************
 761  * aout_BufferAlloc:
 762  *****************************************************************************/
 763
 764 aout_buffer_t *aout_BufferAlloc(aout_alloc_t *allocation, mtime_t microseconds,
 765         aout_buffer_t *old_buffer)
 766 {
 767     if ( !allocation->b_alloc )
 768     {
 769         return old_buffer;
 770     }
 771
 772     size_t i_alloc_size = (int)( (uint64_t)allocation->i_bytes_per_sec
 773                                         * (microseconds) / 1000000 + 1 );
 774
 775     return block_Alloc( i_alloc_size );
 776 }