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_custom_create( p_parent, sizeof( *p_aout ), VLC_OBJECT_AOUT,
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;
100 var_Create( p_aout, "intf-change", VLC_VAR_BOOL );
101 var_SetBool( p_aout, "intf-change", true );
103 vlc_object_set_destructor( p_aout, aout_Destructor );
108 /*****************************************************************************
109 * aout_Destructor: destroy aout structure
110 *****************************************************************************/
111 static void aout_Destructor( vlc_object_t * p_this )
113 aout_instance_t * p_aout = (aout_instance_t *)p_this;
114 vlc_mutex_destroy( &p_aout->input_fifos_lock );
115 vlc_mutex_destroy( &p_aout->mixer_lock );
116 vlc_mutex_destroy( &p_aout->volume_vars_lock );
117 vlc_mutex_destroy( &p_aout->output_fifo_lock );
120 /* Lock ordering rules:
122 * Vars Mixer Input IFIFO OFIFO (< Inner lock)
123 * Vars No! Yes Yes Yes Yes
124 * Mixer No! No! Yes Yes Yes
125 * Input No! No! No! Yes Yes
126 * In FIFOs No! No! No! No! Yes
127 * Out FIFOs No! No! No! No! No!
132 static __thread unsigned aout_locks = 0;
134 void aout_lock (unsigned i)
139 case VOLUME_VARS_LOCK:
143 allowed = VOLUME_VARS_LOCK;
146 allowed = VOLUME_VARS_LOCK|MIXER_LOCK;
148 case INPUT_FIFO_LOCK:
149 allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK;
151 case OUTPUT_FIFO_LOCK:
152 allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK|INPUT_FIFO_LOCK;
158 if (aout_locks & ~allowed)
160 fprintf (stderr, "Illegal audio lock transition (%x -> %x)\n",
161 aout_locks, aout_locks|i);
168 void aout_unlock (unsigned i)
170 assert (aout_locks & i);
176 * Formats management (internal and external)
179 /*****************************************************************************
180 * aout_FormatNbChannels : return the number of channels
181 *****************************************************************************/
182 unsigned int aout_FormatNbChannels( const audio_sample_format_t * p_format )
184 static const uint32_t pi_channels[] =
185 { AOUT_CHAN_CENTER, AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT,
186 AOUT_CHAN_REARCENTER, AOUT_CHAN_REARLEFT, AOUT_CHAN_REARRIGHT,
187 AOUT_CHAN_MIDDLELEFT, AOUT_CHAN_MIDDLERIGHT, AOUT_CHAN_LFE };
188 unsigned int i_nb = 0, i;
190 for ( i = 0; i < sizeof(pi_channels)/sizeof(uint32_t); i++ )
192 if ( p_format->i_physical_channels & pi_channels[i] ) i_nb++;
198 /*****************************************************************************
199 * aout_BitsPerSample : get the number of bits per sample
200 *****************************************************************************/
201 unsigned int aout_BitsPerSample( vlc_fourcc_t i_format )
231 /* For these formats the caller has to indicate the parameters
237 /*****************************************************************************
238 * aout_FormatPrepare : compute the number of bytes per frame & frame length
239 *****************************************************************************/
240 void aout_FormatPrepare( audio_sample_format_t * p_format )
242 p_format->i_channels = aout_FormatNbChannels( p_format );
243 p_format->i_bitspersample = aout_BitsPerSample( p_format->i_format );
244 if( p_format->i_bitspersample > 0 )
246 p_format->i_bytes_per_frame = ( p_format->i_bitspersample / 8 )
247 * aout_FormatNbChannels( p_format );
248 p_format->i_frame_length = 1;
252 /*****************************************************************************
253 * aout_FormatPrintChannels : print a channel in a human-readable form
254 *****************************************************************************/
255 const char * aout_FormatPrintChannels( const audio_sample_format_t * p_format )
257 switch ( p_format->i_physical_channels & AOUT_CHAN_PHYSMASK )
260 case AOUT_CHAN_RIGHT:
261 case AOUT_CHAN_CENTER:
262 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
263 || (p_format->i_original_channels
264 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
266 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
269 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
270 if ( p_format->i_original_channels & AOUT_CHAN_REVERSESTEREO )
272 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
273 return "Dolby/Reverse";
274 return "Stereo/Reverse";
278 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
280 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
282 else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
283 return "Stereo/Mono";
284 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
285 return "Stereo/Left";
286 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
287 return "Stereo/Right";
290 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
292 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
294 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
295 | AOUT_CHAN_REARCENTER:
297 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
298 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
300 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
301 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
303 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
304 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
306 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
307 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
310 case AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
311 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
312 || (p_format->i_original_channels
313 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
315 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
318 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE:
319 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
321 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
322 return "Dual-mono/LFE";
323 else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
325 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
326 return "Stereo/Left/LFE";
327 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
328 return "Stereo/Right/LFE";
330 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
332 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER
335 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
336 | AOUT_CHAN_REARCENTER | AOUT_CHAN_LFE:
338 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
339 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
341 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
342 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
344 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
345 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
347 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
348 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
350 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
351 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
352 | AOUT_CHAN_MIDDLERIGHT:
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 | AOUT_CHAN_LFE:
363 /*****************************************************************************
364 * aout_FormatPrint : print a format in a human-readable form
365 *****************************************************************************/
366 void aout_FormatPrint( aout_instance_t * p_aout, const char * psz_text,
367 const audio_sample_format_t * p_format )
369 msg_Dbg( p_aout, "%s '%4.4s' %d Hz %s frame=%d samples/%d bytes", psz_text,
370 (char *)&p_format->i_format, p_format->i_rate,
371 aout_FormatPrintChannels( p_format ),
372 p_format->i_frame_length, p_format->i_bytes_per_frame );
375 /*****************************************************************************
376 * aout_FormatsPrint : print two formats in a human-readable form
377 *****************************************************************************/
378 void aout_FormatsPrint( aout_instance_t * p_aout, const char * psz_text,
379 const audio_sample_format_t * p_format1,
380 const audio_sample_format_t * p_format2 )
382 msg_Dbg( p_aout, "%s '%4.4s'->'%4.4s' %d Hz->%d Hz %s->%s",
384 (char *)&p_format1->i_format, (char *)&p_format2->i_format,
385 p_format1->i_rate, p_format2->i_rate,
386 aout_FormatPrintChannels( p_format1 ),
387 aout_FormatPrintChannels( p_format2 ) );
392 * FIFO management (internal) - please understand that solving race conditions
393 * is _your_ job, ie. in the audio output you should own the mixer lock
394 * before calling any of these functions.
397 /*****************************************************************************
398 * aout_FifoInit : initialize the members of a FIFO
399 *****************************************************************************/
400 void aout_FifoInit( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
403 AOUT_ASSERT_FIFO_LOCKED;
407 msg_Err( p_aout, "initialising fifo with zero divider" );
410 p_fifo->p_first = NULL;
411 p_fifo->pp_last = &p_fifo->p_first;
412 date_Init( &p_fifo->end_date, i_rate, 1 );
415 /*****************************************************************************
416 * aout_FifoPush : push a packet into the FIFO
417 *****************************************************************************/
418 void aout_FifoPush( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
419 aout_buffer_t * p_buffer )
422 AOUT_ASSERT_FIFO_LOCKED;
424 *p_fifo->pp_last = p_buffer;
425 p_fifo->pp_last = &p_buffer->p_next;
426 *p_fifo->pp_last = NULL;
427 /* Enforce the continuity of the stream. */
428 if ( date_Get( &p_fifo->end_date ) )
430 p_buffer->i_pts = date_Get( &p_fifo->end_date );
431 p_buffer->i_length = date_Increment( &p_fifo->end_date,
432 p_buffer->i_nb_samples );
433 p_buffer->i_length -= p_buffer->i_pts;
437 date_Set( &p_fifo->end_date, p_buffer->i_pts + p_buffer->i_length );
441 /*****************************************************************************
442 * aout_FifoSet : set end_date and trash all buffers (because they aren't
444 *****************************************************************************/
445 void aout_FifoSet( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
448 aout_buffer_t * p_buffer;
450 AOUT_ASSERT_FIFO_LOCKED;
452 date_Set( &p_fifo->end_date, date );
453 p_buffer = p_fifo->p_first;
454 while ( p_buffer != NULL )
456 aout_buffer_t * p_next = p_buffer->p_next;
457 aout_BufferFree( p_buffer );
460 p_fifo->p_first = NULL;
461 p_fifo->pp_last = &p_fifo->p_first;
464 /*****************************************************************************
465 * aout_FifoMoveDates : Move forwards or backwards all dates in the FIFO
466 *****************************************************************************/
467 void aout_FifoMoveDates( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
470 aout_buffer_t * p_buffer;
472 AOUT_ASSERT_FIFO_LOCKED;
474 date_Move( &p_fifo->end_date, difference );
475 p_buffer = p_fifo->p_first;
476 while ( p_buffer != NULL )
478 p_buffer->i_pts += difference;
479 p_buffer = p_buffer->p_next;
483 /*****************************************************************************
484 * aout_FifoNextStart : return the current end_date
485 *****************************************************************************/
486 mtime_t aout_FifoNextStart( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
489 AOUT_ASSERT_FIFO_LOCKED;
490 return date_Get( &p_fifo->end_date );
493 /*****************************************************************************
494 * aout_FifoFirstDate : return the playing date of the first buffer in the
496 *****************************************************************************/
497 mtime_t aout_FifoFirstDate( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
500 AOUT_ASSERT_FIFO_LOCKED;
501 return p_fifo->p_first ? p_fifo->p_first->i_pts : 0;
504 /*****************************************************************************
505 * aout_FifoPop : get the next buffer out of the FIFO
506 *****************************************************************************/
507 aout_buffer_t * aout_FifoPop( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
509 aout_buffer_t * p_buffer;
511 AOUT_ASSERT_FIFO_LOCKED;
513 p_buffer = p_fifo->p_first;
514 if ( p_buffer == NULL ) return NULL;
515 p_fifo->p_first = p_buffer->p_next;
516 if ( p_fifo->p_first == NULL )
518 p_fifo->pp_last = &p_fifo->p_first;
524 /*****************************************************************************
525 * aout_FifoDestroy : destroy a FIFO and its buffers
526 *****************************************************************************/
527 void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
529 aout_buffer_t * p_buffer;
531 AOUT_ASSERT_FIFO_LOCKED;
533 p_buffer = p_fifo->p_first;
534 while ( p_buffer != NULL )
536 aout_buffer_t * p_next = p_buffer->p_next;
537 aout_BufferFree( p_buffer );
541 p_fifo->p_first = NULL;
542 p_fifo->pp_last = &p_fifo->p_first;
545 /*****************************************************************************
546 * aout_CheckChannelReorder : Check if we need to do some channel re-ordering
547 *****************************************************************************/
548 int aout_CheckChannelReorder( const uint32_t *pi_chan_order_in,
549 const uint32_t *pi_chan_order_out,
550 uint32_t i_channel_mask,
551 int i_channels, int *pi_chan_table )
553 bool b_chan_reorder = false;
556 if( i_channels > AOUT_CHAN_MAX )
559 if( pi_chan_order_in == NULL )
560 pi_chan_order_in = pi_vlc_chan_order_wg4;
561 if( pi_chan_order_out == NULL )
562 pi_chan_order_out = pi_vlc_chan_order_wg4;
564 for( i = 0, j = 0; pi_chan_order_in[i]; i++ )
566 if( !(i_channel_mask & pi_chan_order_in[i]) ) continue;
568 for( k = 0, l = 0; pi_chan_order_in[i] != pi_chan_order_out[k]; k++ )
570 if( i_channel_mask & pi_chan_order_out[k] ) l++;
573 pi_chan_table[j++] = l;
576 for( i = 0; i < i_channels; i++ )
578 if( pi_chan_table[i] != i ) b_chan_reorder = true;
581 return b_chan_reorder;
584 /*****************************************************************************
585 * aout_ChannelReorder :
586 *****************************************************************************/
587 void aout_ChannelReorder( uint8_t *p_buf, int i_buffer,
588 int i_channels, const int *pi_chan_table,
589 int i_bits_per_sample )
591 uint8_t p_tmp[AOUT_CHAN_MAX * 4];
594 if( i_bits_per_sample == 8 )
596 for( i = 0; i < i_buffer / i_channels; i++ )
598 for( j = 0; j < i_channels; j++ )
600 p_tmp[pi_chan_table[j]] = p_buf[j];
603 memcpy( p_buf, p_tmp, i_channels );
607 else if( i_bits_per_sample == 16 )
609 for( i = 0; i < i_buffer / i_channels / 2; i++ )
611 for( j = 0; j < i_channels; j++ )
613 p_tmp[2 * pi_chan_table[j]] = p_buf[2 * j];
614 p_tmp[2 * pi_chan_table[j] + 1] = p_buf[2 * j + 1];
617 memcpy( p_buf, p_tmp, 2 * i_channels );
618 p_buf += 2 * i_channels;
621 else if( i_bits_per_sample == 24 )
623 for( i = 0; i < i_buffer / i_channels / 3; i++ )
625 for( j = 0; j < i_channels; j++ )
627 p_tmp[3 * pi_chan_table[j]] = p_buf[3 * j];
628 p_tmp[3 * pi_chan_table[j] + 1] = p_buf[3 * j + 1];
629 p_tmp[3 * pi_chan_table[j] + 2] = p_buf[3 * j + 2];
632 memcpy( p_buf, p_tmp, 3 * i_channels );
633 p_buf += 3 * i_channels;
636 else if( i_bits_per_sample == 32 )
638 for( i = 0; i < i_buffer / i_channels / 4; i++ )
640 for( j = 0; j < i_channels; j++ )
642 p_tmp[4 * pi_chan_table[j]] = p_buf[4 * j];
643 p_tmp[4 * pi_chan_table[j] + 1] = p_buf[4 * j + 1];
644 p_tmp[4 * pi_chan_table[j] + 2] = p_buf[4 * j + 2];
645 p_tmp[4 * pi_chan_table[j] + 3] = p_buf[4 * j + 3];
648 memcpy( p_buf, p_tmp, 4 * i_channels );
649 p_buf += 4 * i_channels;
654 /*****************************************************************************
655 * aout_ChannelExtract:
656 *****************************************************************************/
657 static inline void ExtractChannel( uint8_t *pi_dst, int i_dst_channels,
658 const uint8_t *pi_src, int i_src_channels,
660 const int *pi_selection, int i_bytes )
662 for( int i = 0; i < i_sample_count; i++ )
664 for( int j = 0; j < i_dst_channels; j++ )
665 memcpy( &pi_dst[j * i_bytes], &pi_src[pi_selection[j] * i_bytes], i_bytes );
666 pi_dst += i_dst_channels * i_bytes;
667 pi_src += i_src_channels * i_bytes;
671 void aout_ChannelExtract( void *p_dst, int i_dst_channels,
672 const void *p_src, int i_src_channels,
673 int i_sample_count, const int *pi_selection, int i_bits_per_sample )
675 /* It does not work in place */
676 assert( p_dst != p_src );
678 /* Force the compiler to inline for the specific cases so it can optimize */
679 if( i_bits_per_sample == 8 )
680 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 1 );
681 else if( i_bits_per_sample == 16 )
682 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 2 );
683 else if( i_bits_per_sample == 24 )
684 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 3 );
685 else if( i_bits_per_sample == 32 )
686 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 4 );
687 else if( i_bits_per_sample == 64 )
688 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 8 );
691 bool aout_CheckChannelExtraction( int *pi_selection,
692 uint32_t *pi_layout, int *pi_channels,
693 const uint32_t pi_order_dst[AOUT_CHAN_MAX],
694 const uint32_t *pi_order_src, int i_channels )
696 const uint32_t pi_order_dual_mono[] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT };
697 uint32_t i_layout = 0;
699 int pi_index[AOUT_CHAN_MAX];
703 pi_order_dst = pi_vlc_chan_order_wg4;
705 /* Detect special dual mono case */
706 if( i_channels == 2 &&
707 pi_order_src[0] == AOUT_CHAN_CENTER && pi_order_src[1] == AOUT_CHAN_CENTER )
709 i_layout |= AOUT_CHAN_DUALMONO;
710 pi_order_src = pi_order_dual_mono;
714 for( int i = 0; i < i_channels; i++ )
716 /* Ignore unknown or duplicated channels or not present in output */
717 if( !pi_order_src[i] || (i_layout & pi_order_src[i]) )
720 for( int j = 0; j < AOUT_CHAN_MAX; j++ )
722 if( pi_order_dst[j] == pi_order_src[i] )
724 assert( i_out < AOUT_CHAN_MAX );
725 pi_index[i_out++] = i;
726 i_layout |= pi_order_src[i];
733 for( int i = 0, j = 0; i < AOUT_CHAN_MAX; i++ )
735 for( int k = 0; k < i_out; k++ )
737 if( pi_order_dst[i] == pi_order_src[pi_index[k]] )
739 pi_selection[j++] = pi_index[k];
745 *pi_layout = i_layout;
746 *pi_channels = i_out;
748 for( int i = 0; i < i_out; i++ )
750 if( pi_selection[i] != i )
753 return i_out == i_channels;
756 /*****************************************************************************
758 *****************************************************************************/
760 aout_buffer_t *aout_BufferAlloc(aout_alloc_t *allocation, mtime_t microseconds,
761 aout_buffer_t *old_buffer)
763 if ( !allocation->b_alloc )
768 size_t i_alloc_size = (int)( (uint64_t)allocation->i_bytes_per_sec
769 * (microseconds) / 1000000 + 1 );
771 return block_Alloc( i_alloc_size );