1 /*****************************************************************************
2 * common.c : audio output management of common data structures
3 *****************************************************************************
4 * Copyright (C) 2002-2007 the VideoLAN team
7 * Authors: Christophe Massiot <massiot@via.ecp.fr>
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.
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.
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 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
33 #include <vlc_common.h>
35 #include "aout_internal.h"
39 * Instances management (internal and external)
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 )
49 if( p_fifo == &p_aout->output.fifo )
50 vlc_assert_locked( &p_aout->output_fifo_lock );
54 for( i = 0; i < p_aout->i_nb_inputs; i++ )
56 if( p_fifo == &p_aout->pp_inputs[i]->mixer.fifo)
58 vlc_assert_locked( &p_aout->input_fifos_lock );
62 if( i == p_aout->i_nb_inputs )
63 vlc_assert_locked( &p_aout->mixer_lock );
72 static void aout_Destructor( vlc_object_t * p_this );
74 /*****************************************************************************
75 * aout_New: initialize aout structure
76 *****************************************************************************/
77 aout_instance_t * __aout_New( vlc_object_t * p_parent )
79 aout_instance_t * p_aout;
81 /* Allocate descriptor. */
82 p_aout = vlc_object_create( p_parent, VLC_OBJECT_AOUT );
88 /* Initialize members. */
89 vlc_mutex_init( &p_aout->input_fifos_lock );
90 vlc_mutex_init( &p_aout->mixer_lock );
91 vlc_mutex_init( &p_aout->volume_vars_lock );
92 vlc_mutex_init( &p_aout->output_fifo_lock );
93 p_aout->i_nb_inputs = 0;
94 p_aout->mixer_multiplier = 1.0;
95 p_aout->p_mixer = NULL;
96 p_aout->output.b_error = 1;
97 p_aout->output.b_starving = 1;
99 var_Create( p_aout, "intf-change", VLC_VAR_BOOL );
100 var_SetBool( p_aout, "intf-change", true );
102 vlc_object_set_destructor( p_aout, aout_Destructor );
107 /*****************************************************************************
108 * aout_Destructor: destroy aout structure
109 *****************************************************************************/
110 static void aout_Destructor( vlc_object_t * p_this )
112 aout_instance_t * p_aout = (aout_instance_t *)p_this;
113 vlc_mutex_destroy( &p_aout->input_fifos_lock );
114 vlc_mutex_destroy( &p_aout->mixer_lock );
115 vlc_mutex_destroy( &p_aout->volume_vars_lock );
116 vlc_mutex_destroy( &p_aout->output_fifo_lock );
119 /* Lock ordering rules:
121 * Vars Mixer Input IFIFO OFIFO (< Inner lock)
122 * Vars No! Yes Yes Yes Yes
123 * Mixer No! No! Yes Yes Yes
124 * Input No! No! No! Yes Yes
125 * In FIFOs No! No! No! No! Yes
126 * Out FIFOs No! No! No! No! No!
131 static __thread unsigned aout_locks = 0;
133 void aout_lock (unsigned i)
138 case VOLUME_VARS_LOCK:
142 allowed = VOLUME_VARS_LOCK;
145 allowed = VOLUME_VARS_LOCK|MIXER_LOCK;
147 case INPUT_FIFO_LOCK:
148 allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK;
150 case OUTPUT_FIFO_LOCK:
151 allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK|INPUT_FIFO_LOCK;
157 if (aout_locks & ~allowed)
159 fprintf (stderr, "Illegal audio lock transition (%x -> %x)\n",
160 aout_locks, aout_locks|i);
167 void aout_unlock (unsigned i)
169 assert (aout_locks & i);
175 * Formats management (internal and external)
178 /*****************************************************************************
179 * aout_FormatNbChannels : return the number of channels
180 *****************************************************************************/
181 unsigned int aout_FormatNbChannels( const audio_sample_format_t * p_format )
183 static const uint32_t pi_channels[] =
184 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
185 AOUT_CHAN_REARCENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
186 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_LFE };
187 unsigned int i_nb = 0, i;
189 for ( i = 0; i < sizeof(pi_channels)/sizeof(uint32_t); i++ )
191 if ( p_format->i_physical_channels & pi_channels[i] ) i_nb++;
197 /*****************************************************************************
198 * aout_BitsPerSample : get the number of bits per sample
199 *****************************************************************************/
200 unsigned int aout_BitsPerSample( vlc_fourcc_t i_format )
230 /* For these formats the caller has to indicate the parameters
236 /*****************************************************************************
237 * aout_FormatPrepare : compute the number of bytes per frame & frame length
238 *****************************************************************************/
239 void aout_FormatPrepare( audio_sample_format_t * p_format )
241 p_format->i_channels = aout_FormatNbChannels( p_format );
242 p_format->i_bitspersample = aout_BitsPerSample( p_format->i_format );
243 if( p_format->i_bitspersample > 0 )
245 p_format->i_bytes_per_frame = ( p_format->i_bitspersample / 8 )
246 * aout_FormatNbChannels( p_format );
247 p_format->i_frame_length = 1;
251 /*****************************************************************************
252 * aout_FormatPrintChannels : print a channel in a human-readable form
253 *****************************************************************************/
254 const char * aout_FormatPrintChannels( const audio_sample_format_t * p_format )
256 switch ( p_format->i_physical_channels & AOUT_CHAN_PHYSMASK )
259 case AOUT_CHAN_RIGHT:
260 case AOUT_CHAN_CENTER:
261 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
262 || (p_format->i_original_channels
263 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
265 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
268 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
269 if ( p_format->i_original_channels & AOUT_CHAN_REVERSESTEREO )
271 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
272 return "Dolby/Reverse";
273 return "Stereo/Reverse";
277 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
279 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
281 else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
282 return "Stereo/Mono";
283 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
284 return "Stereo/Left";
285 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
286 return "Stereo/Right";
289 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
291 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
293 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
294 | AOUT_CHAN_REARCENTER:
296 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
297 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
299 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
300 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
302 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
303 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
305 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
306 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
309 case AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
310 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
311 || (p_format->i_original_channels
312 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
314 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
317 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE:
318 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
320 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
321 return "Dual-mono/LFE";
322 else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
324 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
325 return "Stereo/Left/LFE";
326 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
327 return "Stereo/Right/LFE";
329 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
331 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER
334 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
335 | AOUT_CHAN_REARCENTER | AOUT_CHAN_LFE:
337 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
338 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
340 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
341 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
343 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
344 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
346 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
347 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
349 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
350 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
351 | AOUT_CHAN_MIDDLERIGHT:
353 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
354 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
355 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
362 /*****************************************************************************
363 * aout_FormatPrint : print a format in a human-readable form
364 *****************************************************************************/
365 void aout_FormatPrint( aout_instance_t * p_aout, const char * psz_text,
366 const audio_sample_format_t * p_format )
368 msg_Dbg( p_aout, "%s '%4.4s' %d Hz %s frame=%d samples/%d bytes", psz_text,
369 (char *)&p_format->i_format, p_format->i_rate,
370 aout_FormatPrintChannels( p_format ),
371 p_format->i_frame_length, p_format->i_bytes_per_frame );
374 /*****************************************************************************
375 * aout_FormatsPrint : print two formats in a human-readable form
376 *****************************************************************************/
377 void aout_FormatsPrint( aout_instance_t * p_aout, const char * psz_text,
378 const audio_sample_format_t * p_format1,
379 const audio_sample_format_t * p_format2 )
381 msg_Dbg( p_aout, "%s '%4.4s'->'%4.4s' %d Hz->%d Hz %s->%s",
383 (char *)&p_format1->i_format, (char *)&p_format2->i_format,
384 p_format1->i_rate, p_format2->i_rate,
385 aout_FormatPrintChannels( p_format1 ),
386 aout_FormatPrintChannels( p_format2 ) );
391 * FIFO management (internal) - please understand that solving race conditions
392 * is _your_ job, ie. in the audio output you should own the mixer lock
393 * before calling any of these functions.
396 /*****************************************************************************
397 * aout_FifoInit : initialize the members of a FIFO
398 *****************************************************************************/
399 void aout_FifoInit( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
402 AOUT_ASSERT_FIFO_LOCKED;
406 msg_Err( p_aout, "initialising fifo with zero divider" );
409 p_fifo->p_first = NULL;
410 p_fifo->pp_last = &p_fifo->p_first;
411 date_Init( &p_fifo->end_date, i_rate, 1 );
414 /*****************************************************************************
415 * aout_FifoPush : push a packet into the FIFO
416 *****************************************************************************/
417 void aout_FifoPush( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
418 aout_buffer_t * p_buffer )
421 AOUT_ASSERT_FIFO_LOCKED;
423 *p_fifo->pp_last = p_buffer;
424 p_fifo->pp_last = &p_buffer->p_next;
425 *p_fifo->pp_last = NULL;
426 /* Enforce the continuity of the stream. */
427 if ( date_Get( &p_fifo->end_date ) )
429 p_buffer->i_pts = date_Get( &p_fifo->end_date );
430 p_buffer->i_length = date_Increment( &p_fifo->end_date,
431 p_buffer->i_nb_samples );
432 p_buffer->i_length -= p_buffer->i_pts;
436 date_Set( &p_fifo->end_date, p_buffer->i_pts + p_buffer->i_length );
440 /*****************************************************************************
441 * aout_FifoSet : set end_date and trash all buffers (because they aren't
443 *****************************************************************************/
444 void aout_FifoSet( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
447 aout_buffer_t * p_buffer;
449 AOUT_ASSERT_FIFO_LOCKED;
451 date_Set( &p_fifo->end_date, date );
452 p_buffer = p_fifo->p_first;
453 while ( p_buffer != NULL )
455 aout_buffer_t * p_next = p_buffer->p_next;
456 aout_BufferFree( p_buffer );
459 p_fifo->p_first = NULL;
460 p_fifo->pp_last = &p_fifo->p_first;
463 /*****************************************************************************
464 * aout_FifoMoveDates : Move forwards or backwards all dates in the FIFO
465 *****************************************************************************/
466 void aout_FifoMoveDates( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
469 aout_buffer_t * p_buffer;
471 AOUT_ASSERT_FIFO_LOCKED;
473 date_Move( &p_fifo->end_date, difference );
474 p_buffer = p_fifo->p_first;
475 while ( p_buffer != NULL )
477 p_buffer->i_pts += difference;
478 p_buffer = p_buffer->p_next;
482 /*****************************************************************************
483 * aout_FifoNextStart : return the current end_date
484 *****************************************************************************/
485 mtime_t aout_FifoNextStart( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
488 AOUT_ASSERT_FIFO_LOCKED;
489 return date_Get( &p_fifo->end_date );
492 /*****************************************************************************
493 * aout_FifoFirstDate : return the playing date of the first buffer in the
495 *****************************************************************************/
496 mtime_t aout_FifoFirstDate( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
499 AOUT_ASSERT_FIFO_LOCKED;
500 return p_fifo->p_first ? p_fifo->p_first->i_pts : 0;
503 /*****************************************************************************
504 * aout_FifoPop : get the next buffer out of the FIFO
505 *****************************************************************************/
506 aout_buffer_t * aout_FifoPop( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
508 aout_buffer_t * p_buffer;
510 AOUT_ASSERT_FIFO_LOCKED;
512 p_buffer = p_fifo->p_first;
513 if ( p_buffer == NULL ) return NULL;
514 p_fifo->p_first = p_buffer->p_next;
515 if ( p_fifo->p_first == NULL )
517 p_fifo->pp_last = &p_fifo->p_first;
523 /*****************************************************************************
524 * aout_FifoDestroy : destroy a FIFO and its buffers
525 *****************************************************************************/
526 void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
528 aout_buffer_t * p_buffer;
530 AOUT_ASSERT_FIFO_LOCKED;
532 p_buffer = p_fifo->p_first;
533 while ( p_buffer != NULL )
535 aout_buffer_t * p_next = p_buffer->p_next;
536 aout_BufferFree( p_buffer );
540 p_fifo->p_first = NULL;
541 p_fifo->pp_last = &p_fifo->p_first;
544 /*****************************************************************************
545 * aout_CheckChannelReorder : Check if we need to do some channel re-ordering
546 *****************************************************************************/
547 int aout_CheckChannelReorder( const uint32_t *pi_chan_order_in,
548 const uint32_t *pi_chan_order_out,
549 uint32_t i_channel_mask,
550 int i_channels, int *pi_chan_table )
552 bool b_chan_reorder = false;
555 if( i_channels > AOUT_CHAN_MAX )
558 if( pi_chan_order_in == NULL )
559 pi_chan_order_in = pi_vlc_chan_order_wg4;
560 if( pi_chan_order_out == NULL )
561 pi_chan_order_out = pi_vlc_chan_order_wg4;
563 for( i = 0, j = 0; pi_chan_order_in[i]; i++ )
565 if( !(i_channel_mask & pi_chan_order_in[i]) ) continue;
567 for( k = 0, l = 0; pi_chan_order_in[i] != pi_chan_order_out[k]; k++ )
569 if( i_channel_mask & pi_chan_order_out[k] ) l++;
572 pi_chan_table[j++] = l;
575 for( i = 0; i < i_channels; i++ )
577 if( pi_chan_table[i] != i ) b_chan_reorder = true;
580 return b_chan_reorder;
583 /*****************************************************************************
584 * aout_ChannelReorder :
585 *****************************************************************************/
586 void aout_ChannelReorder( uint8_t *p_buf, int i_buffer,
587 int i_channels, const int *pi_chan_table,
588 int i_bits_per_sample )
590 uint8_t p_tmp[AOUT_CHAN_MAX * 4];
593 if( i_bits_per_sample == 8 )
595 for( i = 0; i < i_buffer / i_channels; i++ )
597 for( j = 0; j < i_channels; j++ )
599 p_tmp[pi_chan_table[j]] = p_buf[j];
602 memcpy( p_buf, p_tmp, i_channels );
606 else if( i_bits_per_sample == 16 )
608 for( i = 0; i < i_buffer / i_channels / 2; i++ )
610 for( j = 0; j < i_channels; j++ )
612 p_tmp[2 * pi_chan_table[j]] = p_buf[2 * j];
613 p_tmp[2 * pi_chan_table[j] + 1] = p_buf[2 * j + 1];
616 memcpy( p_buf, p_tmp, 2 * i_channels );
617 p_buf += 2 * i_channels;
620 else if( i_bits_per_sample == 24 )
622 for( i = 0; i < i_buffer / i_channels / 3; i++ )
624 for( j = 0; j < i_channels; j++ )
626 p_tmp[3 * pi_chan_table[j]] = p_buf[3 * j];
627 p_tmp[3 * pi_chan_table[j] + 1] = p_buf[3 * j + 1];
628 p_tmp[3 * pi_chan_table[j] + 2] = p_buf[3 * j + 2];
631 memcpy( p_buf, p_tmp, 3 * i_channels );
632 p_buf += 3 * i_channels;
635 else if( i_bits_per_sample == 32 )
637 for( i = 0; i < i_buffer / i_channels / 4; i++ )
639 for( j = 0; j < i_channels; j++ )
641 p_tmp[4 * pi_chan_table[j]] = p_buf[4 * j];
642 p_tmp[4 * pi_chan_table[j] + 1] = p_buf[4 * j + 1];
643 p_tmp[4 * pi_chan_table[j] + 2] = p_buf[4 * j + 2];
644 p_tmp[4 * pi_chan_table[j] + 3] = p_buf[4 * j + 3];
647 memcpy( p_buf, p_tmp, 4 * i_channels );
648 p_buf += 4 * i_channels;
653 /*****************************************************************************
654 * aout_ChannelExtract:
655 *****************************************************************************/
656 static inline void ExtractChannel( uint8_t *pi_dst, int i_dst_channels,
657 const uint8_t *pi_src, int i_src_channels,
659 const int *pi_selection, int i_bytes )
661 for( int i = 0; i < i_sample_count; i++ )
663 for( int j = 0; j < i_dst_channels; j++ )
664 memcpy( &pi_dst[j * i_bytes], &pi_src[pi_selection[j] * i_bytes], i_bytes );
665 pi_dst += i_dst_channels * i_bytes;
666 pi_src += i_src_channels * i_bytes;
670 void aout_ChannelExtract( void *p_dst, int i_dst_channels,
671 const void *p_src, int i_src_channels,
672 int i_sample_count, const int *pi_selection, int i_bits_per_sample )
674 /* It does not work in place */
675 assert( p_dst != p_src );
677 /* Force the compiler to inline for the specific cases so it can optimize */
678 if( i_bits_per_sample == 8 )
679 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 1 );
680 else if( i_bits_per_sample == 16 )
681 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 2 );
682 else if( i_bits_per_sample == 24 )
683 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 3 );
684 else if( i_bits_per_sample == 32 )
685 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 4 );
686 else if( i_bits_per_sample == 64 )
687 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 8 );
690 bool aout_CheckChannelExtraction( int *pi_selection,
691 uint32_t *pi_layout, int *pi_channels,
692 const uint32_t pi_order_dst[AOUT_CHAN_MAX],
693 const uint32_t *pi_order_src, int i_channels )
695 const uint32_t pi_order_dual_mono[] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT };
696 uint32_t i_layout = 0;
698 int pi_index[AOUT_CHAN_MAX];
702 pi_order_dst = pi_vlc_chan_order_wg4;
704 /* Detect special dual mono case */
705 if( i_channels == 2 &&
706 pi_order_src[0] == AOUT_CHAN_CENTER && pi_order_src[1] == AOUT_CHAN_CENTER )
708 i_layout |= AOUT_CHAN_DUALMONO;
709 pi_order_src = pi_order_dual_mono;
713 for( int i = 0; i < i_channels; i++ )
715 /* Ignore unknown or duplicated channels or not present in output */
716 if( !pi_order_src[i] || (i_layout & pi_order_src[i]) )
719 for( int j = 0; j < AOUT_CHAN_MAX; j++ )
721 if( pi_order_dst[j] == pi_order_src[i] )
723 assert( i_out < AOUT_CHAN_MAX );
724 pi_index[i_out++] = i;
725 i_layout |= pi_order_src[i];
732 for( int i = 0, j = 0; i < AOUT_CHAN_MAX; i++ )
734 for( int k = 0; k < i_out; k++ )
736 if( pi_order_dst[i] == pi_order_src[pi_index[k]] )
738 pi_selection[j++] = pi_index[k];
744 *pi_layout = i_layout;
745 *pi_channels = i_out;
747 for( int i = 0; i < i_out; i++ )
749 if( pi_selection[i] != i )
752 return i_out == i_channels;
755 /*****************************************************************************
757 *****************************************************************************/
759 aout_buffer_t *aout_BufferAlloc(aout_alloc_t *allocation, mtime_t microseconds,
760 aout_buffer_t *old_buffer)
762 if ( !allocation->b_alloc )
767 size_t i_alloc_size = (int)( (uint64_t)allocation->i_bytes_per_sec
768 * (microseconds) / 1000000 + 1 );
770 return block_Alloc( i_alloc_size );