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 );
105 vlc_object_attach( p_aout, p_parent );
110 /*****************************************************************************
111 * aout_Destructor: destroy aout structure
112 *****************************************************************************/
113 static void aout_Destructor( vlc_object_t * p_this )
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 );
122 /* Lock ordering rules:
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!
134 static __thread unsigned aout_locks = 0;
136 void aout_lock (unsigned i)
141 case VOLUME_VARS_LOCK:
145 allowed = VOLUME_VARS_LOCK;
148 allowed = VOLUME_VARS_LOCK|MIXER_LOCK;
150 case INPUT_FIFO_LOCK:
151 allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK;
153 case OUTPUT_FIFO_LOCK:
154 allowed = VOLUME_VARS_LOCK|MIXER_LOCK|INPUT_LOCK|INPUT_FIFO_LOCK;
160 if (aout_locks & ~allowed)
162 fprintf (stderr, "Illegal audio lock transition (%x -> %x)\n",
163 aout_locks, aout_locks|i);
170 void aout_unlock (unsigned i)
172 assert (aout_locks & i);
178 * Formats management (internal and external)
181 /*****************************************************************************
182 * aout_FormatNbChannels : return the number of channels
183 *****************************************************************************/
184 unsigned int aout_FormatNbChannels( const audio_sample_format_t * p_format )
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;
192 for ( i = 0; i < sizeof(pi_channels)/sizeof(uint32_t); i++ )
194 if ( p_format->i_physical_channels & pi_channels[i] ) i_nb++;
200 /*****************************************************************************
201 * aout_BitsPerSample : get the number of bits per sample
202 *****************************************************************************/
203 unsigned int aout_BitsPerSample( vlc_fourcc_t i_format )
205 switch( vlc_fourcc_GetCodec( AUDIO_ES, i_format ) )
235 /* For these formats the caller has to indicate the parameters
241 /*****************************************************************************
242 * aout_FormatPrepare : compute the number of bytes per frame & frame length
243 *****************************************************************************/
244 void aout_FormatPrepare( audio_sample_format_t * p_format )
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 )
250 p_format->i_bytes_per_frame = ( p_format->i_bitspersample / 8 )
251 * aout_FormatNbChannels( p_format );
252 p_format->i_frame_length = 1;
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 )
261 switch ( p_format->i_physical_channels & AOUT_CHAN_PHYSMASK )
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)) )
270 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
273 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
274 if ( p_format->i_original_channels & AOUT_CHAN_REVERSESTEREO )
276 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
277 return "Dolby/Reverse";
278 return "Stereo/Reverse";
282 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
284 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
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";
294 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
296 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
298 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
299 | AOUT_CHAN_REARCENTER:
301 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
302 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
304 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
305 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
307 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
308 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
310 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
311 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
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)) )
319 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
322 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE:
323 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
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 )
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";
334 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
336 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER
339 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
340 | AOUT_CHAN_REARCENTER | AOUT_CHAN_LFE:
342 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
343 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
345 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
346 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
348 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
349 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
351 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
352 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_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:
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:
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 )
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 );
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 )
386 msg_Dbg( p_aout, "%s '%4.4s'->'%4.4s' %d Hz->%d Hz %s->%s",
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 ) );
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.
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,
407 AOUT_ASSERT_FIFO_LOCKED;
411 msg_Err( p_aout, "initialising fifo with zero divider" );
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 );
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 )
426 AOUT_ASSERT_FIFO_LOCKED;
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 ) )
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;
441 date_Set( &p_fifo->end_date, p_buffer->i_pts + p_buffer->i_length );
445 /*****************************************************************************
446 * aout_FifoSet : set end_date and trash all buffers (because they aren't
448 *****************************************************************************/
449 void aout_FifoSet( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
452 aout_buffer_t * p_buffer;
454 AOUT_ASSERT_FIFO_LOCKED;
456 date_Set( &p_fifo->end_date, date );
457 p_buffer = p_fifo->p_first;
458 while ( p_buffer != NULL )
460 aout_buffer_t * p_next = p_buffer->p_next;
461 aout_BufferFree( p_buffer );
464 p_fifo->p_first = NULL;
465 p_fifo->pp_last = &p_fifo->p_first;
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,
474 aout_buffer_t * p_buffer;
476 AOUT_ASSERT_FIFO_LOCKED;
478 date_Move( &p_fifo->end_date, difference );
479 p_buffer = p_fifo->p_first;
480 while ( p_buffer != NULL )
482 p_buffer->i_pts += difference;
483 p_buffer = p_buffer->p_next;
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 )
493 AOUT_ASSERT_FIFO_LOCKED;
494 return date_Get( &p_fifo->end_date );
497 /*****************************************************************************
498 * aout_FifoFirstDate : return the playing date of the first buffer in the
500 *****************************************************************************/
501 mtime_t aout_FifoFirstDate( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
504 AOUT_ASSERT_FIFO_LOCKED;
505 return p_fifo->p_first ? p_fifo->p_first->i_pts : 0;
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 )
513 aout_buffer_t * p_buffer;
515 AOUT_ASSERT_FIFO_LOCKED;
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 )
522 p_fifo->pp_last = &p_fifo->p_first;
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 )
533 aout_buffer_t * p_buffer;
535 AOUT_ASSERT_FIFO_LOCKED;
537 p_buffer = p_fifo->p_first;
538 while ( p_buffer != NULL )
540 aout_buffer_t * p_next = p_buffer->p_next;
541 aout_BufferFree( p_buffer );
545 p_fifo->p_first = NULL;
546 p_fifo->pp_last = &p_fifo->p_first;
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 )
557 bool b_chan_reorder = false;
560 if( i_channels > AOUT_CHAN_MAX )
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;
568 for( i = 0, j = 0; pi_chan_order_in[i]; i++ )
570 if( !(i_channel_mask & pi_chan_order_in[i]) ) continue;
572 for( k = 0, l = 0; pi_chan_order_in[i] != pi_chan_order_out[k]; k++ )
574 if( i_channel_mask & pi_chan_order_out[k] ) l++;
577 pi_chan_table[j++] = l;
580 for( i = 0; i < i_channels; i++ )
582 if( pi_chan_table[i] != i ) b_chan_reorder = true;
585 return b_chan_reorder;
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 )
595 uint8_t p_tmp[AOUT_CHAN_MAX * 4];
598 if( i_bits_per_sample == 8 )
600 for( i = 0; i < i_buffer / i_channels; i++ )
602 for( j = 0; j < i_channels; j++ )
604 p_tmp[pi_chan_table[j]] = p_buf[j];
607 memcpy( p_buf, p_tmp, i_channels );
611 else if( i_bits_per_sample == 16 )
613 for( i = 0; i < i_buffer / i_channels / 2; i++ )
615 for( j = 0; j < i_channels; j++ )
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];
621 memcpy( p_buf, p_tmp, 2 * i_channels );
622 p_buf += 2 * i_channels;
625 else if( i_bits_per_sample == 24 )
627 for( i = 0; i < i_buffer / i_channels / 3; i++ )
629 for( j = 0; j < i_channels; j++ )
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];
636 memcpy( p_buf, p_tmp, 3 * i_channels );
637 p_buf += 3 * i_channels;
640 else if( i_bits_per_sample == 32 )
642 for( i = 0; i < i_buffer / i_channels / 4; i++ )
644 for( j = 0; j < i_channels; j++ )
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];
652 memcpy( p_buf, p_tmp, 4 * i_channels );
653 p_buf += 4 * i_channels;
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,
664 const int *pi_selection, int i_bytes )
666 for( int i = 0; i < i_sample_count; i++ )
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;
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 )
679 /* It does not work in place */
680 assert( p_dst != p_src );
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 );
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 )
700 const uint32_t pi_order_dual_mono[] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT };
701 uint32_t i_layout = 0;
703 int pi_index[AOUT_CHAN_MAX];
707 pi_order_dst = pi_vlc_chan_order_wg4;
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 )
713 i_layout |= AOUT_CHAN_DUALMONO;
714 pi_order_src = pi_order_dual_mono;
718 for( int i = 0; i < i_channels; i++ )
720 /* Ignore unknown or duplicated channels or not present in output */
721 if( !pi_order_src[i] || (i_layout & pi_order_src[i]) )
724 for( int j = 0; j < AOUT_CHAN_MAX; j++ )
726 if( pi_order_dst[j] == pi_order_src[i] )
728 assert( i_out < AOUT_CHAN_MAX );
729 pi_index[i_out++] = i;
730 i_layout |= pi_order_src[i];
737 for( int i = 0, j = 0; i < AOUT_CHAN_MAX; i++ )
739 for( int k = 0; k < i_out; k++ )
741 if( pi_order_dst[i] == pi_order_src[pi_index[k]] )
743 pi_selection[j++] = pi_index[k];
749 *pi_layout = i_layout;
750 *pi_channels = i_out;
752 for( int i = 0; i < i_out; i++ )
754 if( pi_selection[i] != i )
757 return i_out == i_channels;
760 /*****************************************************************************
762 *****************************************************************************/
764 aout_buffer_t *aout_BufferAlloc(aout_alloc_t *allocation, mtime_t microseconds,
765 aout_buffer_t *old_buffer)
767 if ( !allocation->b_alloc )
772 size_t i_alloc_size = (int)( (uint64_t)allocation->i_bytes_per_sec
773 * (microseconds) / 1000000 + 1 );
775 return block_Alloc( i_alloc_size );