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 *****************************************************************************/
34 #include <vlc_common.h>
36 #include "aout_internal.h"
40 * Instances management (internal and external)
43 #define AOUT_ASSERT_FIFO_LOCKED aout_assert_fifo_locked(p_aout, p_fifo)
44 static inline void aout_assert_fifo_locked( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
50 if( p_fifo == &p_aout->output.fifo )
51 vlc_assert_locked( &p_aout->output_fifo_lock );
55 for( i = 0; i < p_aout->i_nb_inputs; i++ )
57 if( p_fifo == &p_aout->pp_inputs[i]->mixer.fifo)
59 vlc_assert_locked( &p_aout->input_fifos_lock );
63 if( i == p_aout->i_nb_inputs )
64 vlc_assert_locked( &p_aout->mixer_lock );
73 static void aout_Destructor( vlc_object_t * p_this );
75 /*****************************************************************************
76 * aout_New: initialize aout structure
77 *****************************************************************************/
78 aout_instance_t * __aout_New( vlc_object_t * p_parent )
80 aout_instance_t * p_aout;
82 /* Allocate descriptor. */
83 p_aout = vlc_custom_create( p_parent, sizeof( *p_aout ), VLC_OBJECT_AOUT,
90 /* Initialize members. */
91 vlc_mutex_init( &p_aout->input_fifos_lock );
92 vlc_mutex_init( &p_aout->mixer_lock );
93 vlc_mutex_init( &p_aout->volume_vars_lock );
94 vlc_mutex_init( &p_aout->output_fifo_lock );
95 p_aout->i_nb_inputs = 0;
96 p_aout->mixer_multiplier = 1.0;
97 p_aout->p_mixer = NULL;
98 p_aout->output.b_error = 1;
99 p_aout->output.b_starving = 1;
101 var_Create( p_aout, "intf-change", VLC_VAR_VOID );
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_BitsPerSample : get the number of bits per sample
181 *****************************************************************************/
182 unsigned int aout_BitsPerSample( vlc_fourcc_t i_format )
184 switch( vlc_fourcc_GetCodec( AUDIO_ES, i_format ) )
214 /* For these formats the caller has to indicate the parameters
220 /*****************************************************************************
221 * aout_FormatPrepare : compute the number of bytes per frame & frame length
222 *****************************************************************************/
223 void aout_FormatPrepare( audio_sample_format_t * p_format )
225 p_format->i_channels = aout_FormatNbChannels( p_format );
226 p_format->i_bitspersample = aout_BitsPerSample( p_format->i_format );
227 if( p_format->i_bitspersample > 0 )
229 p_format->i_bytes_per_frame = ( p_format->i_bitspersample / 8 )
230 * aout_FormatNbChannels( p_format );
231 p_format->i_frame_length = 1;
235 /*****************************************************************************
236 * aout_FormatPrintChannels : print a channel in a human-readable form
237 *****************************************************************************/
238 const char * aout_FormatPrintChannels( const audio_sample_format_t * p_format )
240 switch ( p_format->i_physical_channels & AOUT_CHAN_PHYSMASK )
243 case AOUT_CHAN_RIGHT:
244 case AOUT_CHAN_CENTER:
245 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
246 || (p_format->i_original_channels
247 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
249 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
252 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT:
253 if ( p_format->i_original_channels & AOUT_CHAN_REVERSESTEREO )
255 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
256 return "Dolby/Reverse";
257 return "Stereo/Reverse";
261 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
263 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
265 else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
266 return "Stereo/Mono";
267 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
268 return "Stereo/Left";
269 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
270 return "Stereo/Right";
273 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER:
275 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER:
277 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
278 | AOUT_CHAN_REARCENTER:
280 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
281 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
283 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
284 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
286 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
287 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT:
289 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
290 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT:
293 case AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
294 if ( (p_format->i_original_channels & AOUT_CHAN_CENTER)
295 || (p_format->i_original_channels
296 & (AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT)) )
298 else if ( p_format->i_original_channels & AOUT_CHAN_LEFT )
301 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_LFE:
302 if ( p_format->i_original_channels & AOUT_CHAN_DOLBYSTEREO )
304 else if ( p_format->i_original_channels & AOUT_CHAN_DUALMONO )
305 return "Dual-mono/LFE";
306 else if ( p_format->i_original_channels == AOUT_CHAN_CENTER )
308 else if ( !(p_format->i_original_channels & AOUT_CHAN_RIGHT) )
309 return "Stereo/Left/LFE";
310 else if ( !(p_format->i_original_channels & AOUT_CHAN_LEFT) )
311 return "Stereo/Right/LFE";
313 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER | AOUT_CHAN_LFE:
315 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_REARCENTER
318 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
319 | AOUT_CHAN_REARCENTER | AOUT_CHAN_LFE:
321 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
322 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
324 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
325 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
327 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
328 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_LFE:
330 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
331 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
333 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
334 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
335 | AOUT_CHAN_MIDDLERIGHT:
337 case AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
338 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT | AOUT_CHAN_MIDDLELEFT
339 | AOUT_CHAN_MIDDLERIGHT | AOUT_CHAN_LFE:
346 /*****************************************************************************
347 * aout_FormatPrint : print a format in a human-readable form
348 *****************************************************************************/
349 void aout_FormatPrint( aout_instance_t * p_aout, const char * psz_text,
350 const audio_sample_format_t * p_format )
352 msg_Dbg( p_aout, "%s '%4.4s' %d Hz %s frame=%d samples/%d bytes", psz_text,
353 (char *)&p_format->i_format, p_format->i_rate,
354 aout_FormatPrintChannels( p_format ),
355 p_format->i_frame_length, p_format->i_bytes_per_frame );
358 /*****************************************************************************
359 * aout_FormatsPrint : print two formats in a human-readable form
360 *****************************************************************************/
361 void aout_FormatsPrint( aout_instance_t * p_aout, const char * psz_text,
362 const audio_sample_format_t * p_format1,
363 const audio_sample_format_t * p_format2 )
365 msg_Dbg( p_aout, "%s '%4.4s'->'%4.4s' %d Hz->%d Hz %s->%s",
367 (char *)&p_format1->i_format, (char *)&p_format2->i_format,
368 p_format1->i_rate, p_format2->i_rate,
369 aout_FormatPrintChannels( p_format1 ),
370 aout_FormatPrintChannels( p_format2 ) );
375 * FIFO management (internal) - please understand that solving race conditions
376 * is _your_ job, ie. in the audio output you should own the mixer lock
377 * before calling any of these functions.
380 /*****************************************************************************
381 * aout_FifoInit : initialize the members of a FIFO
382 *****************************************************************************/
383 void aout_FifoInit( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
386 AOUT_ASSERT_FIFO_LOCKED;
390 msg_Err( p_aout, "initialising fifo with zero divider" );
393 p_fifo->p_first = NULL;
394 p_fifo->pp_last = &p_fifo->p_first;
395 date_Init( &p_fifo->end_date, i_rate, 1 );
398 /*****************************************************************************
399 * aout_FifoPush : push a packet into the FIFO
400 *****************************************************************************/
401 void aout_FifoPush( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
402 aout_buffer_t * p_buffer )
405 AOUT_ASSERT_FIFO_LOCKED;
407 *p_fifo->pp_last = p_buffer;
408 p_fifo->pp_last = &p_buffer->p_next;
409 *p_fifo->pp_last = NULL;
410 /* Enforce the continuity of the stream. */
411 if ( date_Get( &p_fifo->end_date ) )
413 p_buffer->i_pts = date_Get( &p_fifo->end_date );
414 p_buffer->i_length = date_Increment( &p_fifo->end_date,
415 p_buffer->i_nb_samples );
416 p_buffer->i_length -= p_buffer->i_pts;
420 date_Set( &p_fifo->end_date, p_buffer->i_pts + p_buffer->i_length );
424 /*****************************************************************************
425 * aout_FifoSet : set end_date and trash all buffers (because they aren't
427 *****************************************************************************/
428 void aout_FifoSet( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
431 aout_buffer_t * p_buffer;
433 AOUT_ASSERT_FIFO_LOCKED;
435 date_Set( &p_fifo->end_date, date );
436 p_buffer = p_fifo->p_first;
437 while ( p_buffer != NULL )
439 aout_buffer_t * p_next = p_buffer->p_next;
440 aout_BufferFree( p_buffer );
443 p_fifo->p_first = NULL;
444 p_fifo->pp_last = &p_fifo->p_first;
447 /*****************************************************************************
448 * aout_FifoMoveDates : Move forwards or backwards all dates in the FIFO
449 *****************************************************************************/
450 void aout_FifoMoveDates( aout_instance_t * p_aout, aout_fifo_t * p_fifo,
453 aout_buffer_t * p_buffer;
455 AOUT_ASSERT_FIFO_LOCKED;
457 date_Move( &p_fifo->end_date, difference );
458 p_buffer = p_fifo->p_first;
459 while ( p_buffer != NULL )
461 p_buffer->i_pts += difference;
462 p_buffer = p_buffer->p_next;
466 /*****************************************************************************
467 * aout_FifoNextStart : return the current end_date
468 *****************************************************************************/
469 mtime_t aout_FifoNextStart( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
472 AOUT_ASSERT_FIFO_LOCKED;
473 return date_Get( &p_fifo->end_date );
476 /*****************************************************************************
477 * aout_FifoFirstDate : return the playing date of the first buffer in the
479 *****************************************************************************/
480 mtime_t aout_FifoFirstDate( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
483 AOUT_ASSERT_FIFO_LOCKED;
484 return p_fifo->p_first ? p_fifo->p_first->i_pts : 0;
487 /*****************************************************************************
488 * aout_FifoPop : get the next buffer out of the FIFO
489 *****************************************************************************/
490 aout_buffer_t * aout_FifoPop( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
492 aout_buffer_t * p_buffer;
494 AOUT_ASSERT_FIFO_LOCKED;
496 p_buffer = p_fifo->p_first;
497 if ( p_buffer == NULL ) return NULL;
498 p_fifo->p_first = p_buffer->p_next;
499 if ( p_fifo->p_first == NULL )
501 p_fifo->pp_last = &p_fifo->p_first;
507 /*****************************************************************************
508 * aout_FifoDestroy : destroy a FIFO and its buffers
509 *****************************************************************************/
510 void aout_FifoDestroy( aout_instance_t * p_aout, aout_fifo_t * p_fifo )
512 aout_buffer_t * p_buffer;
514 AOUT_ASSERT_FIFO_LOCKED;
516 p_buffer = p_fifo->p_first;
517 while ( p_buffer != NULL )
519 aout_buffer_t * p_next = p_buffer->p_next;
520 aout_BufferFree( p_buffer );
524 p_fifo->p_first = NULL;
525 p_fifo->pp_last = &p_fifo->p_first;
528 /*****************************************************************************
529 * aout_CheckChannelReorder : Check if we need to do some channel re-ordering
530 *****************************************************************************/
531 int aout_CheckChannelReorder( const uint32_t *pi_chan_order_in,
532 const uint32_t *pi_chan_order_out,
533 uint32_t i_channel_mask,
534 int i_channels, int *pi_chan_table )
536 bool b_chan_reorder = false;
539 if( i_channels > AOUT_CHAN_MAX )
542 if( pi_chan_order_in == NULL )
543 pi_chan_order_in = pi_vlc_chan_order_wg4;
544 if( pi_chan_order_out == NULL )
545 pi_chan_order_out = pi_vlc_chan_order_wg4;
547 for( i = 0, j = 0; pi_chan_order_in[i]; i++ )
549 if( !(i_channel_mask & pi_chan_order_in[i]) ) continue;
551 for( k = 0, l = 0; pi_chan_order_in[i] != pi_chan_order_out[k]; k++ )
553 if( i_channel_mask & pi_chan_order_out[k] ) l++;
556 pi_chan_table[j++] = l;
559 for( i = 0; i < i_channels; i++ )
561 if( pi_chan_table[i] != i ) b_chan_reorder = true;
564 return b_chan_reorder;
567 /*****************************************************************************
568 * aout_ChannelReorder :
569 *****************************************************************************/
570 void aout_ChannelReorder( uint8_t *p_buf, int i_buffer,
571 int i_channels, const int *pi_chan_table,
572 int i_bits_per_sample )
574 uint8_t p_tmp[AOUT_CHAN_MAX * 4];
577 if( i_bits_per_sample == 8 )
579 for( i = 0; i < i_buffer / i_channels; i++ )
581 for( j = 0; j < i_channels; j++ )
583 p_tmp[pi_chan_table[j]] = p_buf[j];
586 memcpy( p_buf, p_tmp, i_channels );
590 else if( i_bits_per_sample == 16 )
592 for( i = 0; i < i_buffer / i_channels / 2; i++ )
594 for( j = 0; j < i_channels; j++ )
596 p_tmp[2 * pi_chan_table[j]] = p_buf[2 * j];
597 p_tmp[2 * pi_chan_table[j] + 1] = p_buf[2 * j + 1];
600 memcpy( p_buf, p_tmp, 2 * i_channels );
601 p_buf += 2 * i_channels;
604 else if( i_bits_per_sample == 24 )
606 for( i = 0; i < i_buffer / i_channels / 3; i++ )
608 for( j = 0; j < i_channels; j++ )
610 p_tmp[3 * pi_chan_table[j]] = p_buf[3 * j];
611 p_tmp[3 * pi_chan_table[j] + 1] = p_buf[3 * j + 1];
612 p_tmp[3 * pi_chan_table[j] + 2] = p_buf[3 * j + 2];
615 memcpy( p_buf, p_tmp, 3 * i_channels );
616 p_buf += 3 * i_channels;
619 else if( i_bits_per_sample == 32 )
621 for( i = 0; i < i_buffer / i_channels / 4; i++ )
623 for( j = 0; j < i_channels; j++ )
625 p_tmp[4 * pi_chan_table[j]] = p_buf[4 * j];
626 p_tmp[4 * pi_chan_table[j] + 1] = p_buf[4 * j + 1];
627 p_tmp[4 * pi_chan_table[j] + 2] = p_buf[4 * j + 2];
628 p_tmp[4 * pi_chan_table[j] + 3] = p_buf[4 * j + 3];
631 memcpy( p_buf, p_tmp, 4 * i_channels );
632 p_buf += 4 * i_channels;
637 /*****************************************************************************
638 * aout_ChannelExtract:
639 *****************************************************************************/
640 static inline void ExtractChannel( uint8_t *pi_dst, int i_dst_channels,
641 const uint8_t *pi_src, int i_src_channels,
643 const int *pi_selection, int i_bytes )
645 for( int i = 0; i < i_sample_count; i++ )
647 for( int j = 0; j < i_dst_channels; j++ )
648 memcpy( &pi_dst[j * i_bytes], &pi_src[pi_selection[j] * i_bytes], i_bytes );
649 pi_dst += i_dst_channels * i_bytes;
650 pi_src += i_src_channels * i_bytes;
654 void aout_ChannelExtract( void *p_dst, int i_dst_channels,
655 const void *p_src, int i_src_channels,
656 int i_sample_count, const int *pi_selection, int i_bits_per_sample )
658 /* It does not work in place */
659 assert( p_dst != p_src );
661 /* Force the compiler to inline for the specific cases so it can optimize */
662 if( i_bits_per_sample == 8 )
663 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 1 );
664 else if( i_bits_per_sample == 16 )
665 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 2 );
666 else if( i_bits_per_sample == 24 )
667 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 3 );
668 else if( i_bits_per_sample == 32 )
669 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 4 );
670 else if( i_bits_per_sample == 64 )
671 ExtractChannel( p_dst, i_dst_channels, p_src, i_src_channels, i_sample_count, pi_selection, 8 );
674 bool aout_CheckChannelExtraction( int *pi_selection,
675 uint32_t *pi_layout, int *pi_channels,
676 const uint32_t pi_order_dst[AOUT_CHAN_MAX],
677 const uint32_t *pi_order_src, int i_channels )
679 const uint32_t pi_order_dual_mono[] = { AOUT_CHAN_LEFT, AOUT_CHAN_RIGHT };
680 uint32_t i_layout = 0;
682 int pi_index[AOUT_CHAN_MAX];
686 pi_order_dst = pi_vlc_chan_order_wg4;
688 /* Detect special dual mono case */
689 if( i_channels == 2 &&
690 pi_order_src[0] == AOUT_CHAN_CENTER && pi_order_src[1] == AOUT_CHAN_CENTER )
692 i_layout |= AOUT_CHAN_DUALMONO;
693 pi_order_src = pi_order_dual_mono;
697 for( int i = 0; i < i_channels; i++ )
699 /* Ignore unknown or duplicated channels or not present in output */
700 if( !pi_order_src[i] || (i_layout & pi_order_src[i]) )
703 for( int j = 0; j < AOUT_CHAN_MAX; j++ )
705 if( pi_order_dst[j] == pi_order_src[i] )
707 assert( i_out < AOUT_CHAN_MAX );
708 pi_index[i_out++] = i;
709 i_layout |= pi_order_src[i];
716 for( int i = 0, j = 0; i < AOUT_CHAN_MAX; i++ )
718 for( int k = 0; k < i_out; k++ )
720 if( pi_order_dst[i] == pi_order_src[pi_index[k]] )
722 pi_selection[j++] = pi_index[k];
728 *pi_layout = i_layout;
729 *pi_channels = i_out;
731 for( int i = 0; i < i_out; i++ )
733 if( pi_selection[i] != i )
736 return i_out == i_channels;
739 /*****************************************************************************
741 *****************************************************************************/
743 aout_buffer_t *aout_BufferAlloc(aout_alloc_t *allocation, mtime_t microseconds,
744 aout_buffer_t *old_buffer)
746 if ( !allocation->b_alloc )
751 size_t i_alloc_size = (int)( (uint64_t)allocation->i_bytes_per_sec
752 * (microseconds) / 1000000 + 1 );
754 return block_Alloc( i_alloc_size );
757 /* Return the order in which filters should be inserted */
758 static int FilterOrder( const char *psz_name )
760 static const struct {
761 const char *psz_name;
767 for( int i = 0; filter[i].psz_name; i++ )
769 if( !strcmp( filter[i].psz_name, psz_name ) )
770 return filter[i].i_order;
775 /* This function will add or remove a a module from a string list (colon
776 * separated). It will return true if there is a modification
777 * In case p_aout is NULL, we will use configuration instead of variable */
778 bool aout_ChangeFilterString( vlc_object_t *p_obj, aout_instance_t *p_aout,
779 const char *psz_variable,
780 const char *psz_name, bool b_add )
782 if( *psz_name == '\0' )
788 psz_list = var_GetString( p_aout, psz_variable );
792 psz_list = var_CreateGetString( p_obj->p_libvlc, psz_variable );
793 var_Destroy( p_obj->p_libvlc, psz_variable );
796 /* Split the string into an array of filters */
798 for( char *p = psz_list; p && *p; p++ )
799 i_count += *p == ':';
802 const char **ppsz_filter = calloc( i_count, sizeof(*ppsz_filter) );
808 bool b_present = false;
810 for( char *p = psz_list; p && *p; )
812 char *psz_end = strchr(p, ':');
816 psz_end = p + strlen(p);
819 b_present |= !strcmp( p, psz_name );
820 ppsz_filter[i_count++] = p;
824 if( b_present == b_add )
833 int i_order = FilterOrder( psz_name );
835 for( i = 0; i < i_count; i++ )
837 if( FilterOrder( ppsz_filter[i] ) > i_order )
841 memmove( &ppsz_filter[i+1], &ppsz_filter[i], (i_count - i) * sizeof(*ppsz_filter) );
842 ppsz_filter[i] = psz_name;
847 for( int i = 0; i < i_count; i++ )
849 if( !strcmp( ppsz_filter[i], psz_name ) )
854 for( int i = 0; i < i_count; i++ )
855 i_length += 1 + strlen( ppsz_filter[i] );
857 char *psz_new = malloc( i_length + 1 );
859 for( int i = 0; i < i_count; i++ )
861 if( *ppsz_filter[i] == '\0' )
864 strcat( psz_new, ":" );
865 strcat( psz_new, ppsz_filter[i] );
871 var_SetString( p_aout, psz_variable, psz_new );
873 config_PutPsz( p_obj, psz_variable, psz_new );