1 /*****************************************************************************
2 * alsa.c : alsa plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2001 VideoLAN
7 * Authors: Henri Fallon <henri@videolan.org> - Original Author
8 * Jeffrey Baker <jwbaker@acm.org> - Port to ALSA 1.0 API
9 * John Paul Lorenti <jpl31@columbia.edu> - Device selection
10 * Arnaud de Bossoreille de Ribou <bozo@via.ecp.fr> - S/PDIF and aout3
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
30 #include <errno.h> /* ENOMEM */
31 #include <string.h> /* strerror() */
32 #include <stdlib.h> /* calloc(), malloc(), free() */
38 #include "aout_internal.h"
41 Note: we use the new API which is available since 0.9.0beta10a. */
42 #define ALSA_PCM_NEW_HW_PARAMS_API
43 #define ALSA_PCM_NEW_SW_PARAMS_API
44 #include <alsa/asoundlib.h>
46 /*****************************************************************************
47 * aout_sys_t: ALSA audio output method descriptor
48 *****************************************************************************
49 * This structure is part of the audio output thread descriptor.
50 * It describes the ALSA specific properties of an audio device.
51 *****************************************************************************/
54 snd_pcm_t * p_snd_pcm;
58 snd_output_t * p_snd_stderr;
61 int b_playing; /* playing status */
67 snd_pcm_status_t *p_status;
70 #define A52_FRAME_NB 1536
72 /* These values are in frames.
73 To convert them to a number of bytes you have to multiply them by the
74 number of channel(s) (eg. 2 for stereo) and the size of a sample (eg.
76 #define ALSA_DEFAULT_PERIOD_SIZE 1024
77 #define ALSA_DEFAULT_BUFFER_SIZE ( ALSA_DEFAULT_PERIOD_SIZE << 8 )
78 #define ALSA_SPDIF_PERIOD_SIZE A52_FRAME_NB
79 #define ALSA_SPDIF_BUFFER_SIZE ( ALSA_SPDIF_PERIOD_SIZE << 4 )
80 /* Why << 4 ? --Meuuh */
81 /* Why not ? --Bozo */
84 #define DEFAULT_ALSA_DEVICE N_("default")
86 /*****************************************************************************
88 *****************************************************************************/
89 static int Open ( vlc_object_t * );
90 static void Close ( vlc_object_t * );
91 static void Play ( aout_instance_t * );
92 static int ALSAThread ( aout_instance_t * );
93 static void ALSAFill ( aout_instance_t * );
94 static int FindDevicesCallback( vlc_object_t *p_this, char const *psz_name,
95 vlc_value_t newval, vlc_value_t oldval, void *p_unused );
97 /*****************************************************************************
99 *****************************************************************************/
100 static char *ppsz_devices[] = { "default" };
101 static char *ppsz_devices_text[] = { N_("Default") };
103 set_shortname( "ALSA" );
104 set_description( _("ALSA audio output") );
105 set_category( CAT_AUDIO );
106 set_subcategory( SUBCAT_AUDIO_AOUT );
107 add_string( "alsadev", DEFAULT_ALSA_DEVICE, aout_FindAndRestart,
108 N_("ALSA Device Name"), NULL, VLC_FALSE );
109 change_string_list( ppsz_devices, ppsz_devices_text, FindDevicesCallback );
110 change_action_add( FindDevicesCallback, N_("Refresh list") );
114 set_capability( "audio output", 150 );
115 set_callbacks( Open, Close );
118 /*****************************************************************************
119 * Probe: probe the audio device for available formats and channels
120 *****************************************************************************/
121 static void Probe( aout_instance_t * p_aout,
122 const char * psz_device, const char * psz_iec_device,
123 int *pi_snd_pcm_format )
125 struct aout_sys_t * p_sys = p_aout->output.p_sys;
126 vlc_value_t val, text;
129 var_Create ( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
130 text.psz_string = _("Audio Device");
131 var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
133 /* We'll open the audio device in non blocking mode so we can just exit
134 * when it is already in use, but for the real stuff we'll still use
135 * the blocking mode */
137 /* Now test linear PCM capabilities */
138 if ( !(i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_device,
139 SND_PCM_STREAM_PLAYBACK,
140 SND_PCM_NONBLOCK ) ) )
143 snd_pcm_hw_params_t * p_hw;
144 snd_pcm_hw_params_alloca (&p_hw);
146 if ( snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) < 0 )
148 msg_Warn( p_aout, "unable to retrieve initial hardware parameters"
149 ", disabling linear PCM audio" );
150 snd_pcm_close( p_sys->p_snd_pcm );
151 var_Destroy( p_aout, "audio-device" );
155 if ( snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
156 *pi_snd_pcm_format ) < 0 )
158 if( *pi_snd_pcm_format != SND_PCM_FORMAT_S16 )
160 *pi_snd_pcm_format = SND_PCM_FORMAT_S16;
161 if ( snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
162 *pi_snd_pcm_format ) < 0 )
164 msg_Warn( p_aout, "unable to set stream sample size and "
165 "word order, disabling linear PCM audio" );
166 snd_pcm_close( p_sys->p_snd_pcm );
167 var_Destroy( p_aout, "audio-device" );
173 i_channels = aout_FormatNbChannels( &p_aout->output.output );
175 while ( i_channels > 0 )
177 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw,
180 switch ( i_channels )
183 val.i_int = AOUT_VAR_MONO;
184 text.psz_string = N_("Mono");
185 var_Change( p_aout, "audio-device",
186 VLC_VAR_ADDCHOICE, &val, &text );
189 val.i_int = AOUT_VAR_STEREO;
190 text.psz_string = N_("Stereo");
191 var_Change( p_aout, "audio-device",
192 VLC_VAR_ADDCHOICE, &val, &text );
193 var_Set( p_aout, "audio-device", val );
196 val.i_int = AOUT_VAR_2F2R;
197 text.psz_string = N_("2 Front 2 Rear");
198 var_Change( p_aout, "audio-device",
199 VLC_VAR_ADDCHOICE, &val, &text );
202 val.i_int = AOUT_VAR_5_1;
203 text.psz_string = N_("5.1");
204 var_Change( p_aout, "audio-device",
205 VLC_VAR_ADDCHOICE, &val, &text );
213 /* Special case for mono on stereo only boards */
214 i_channels = aout_FormatNbChannels( &p_aout->output.output );
215 var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
216 if( val.i_int <= 0 && i_channels == 1 )
218 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw, 2 ))
220 val.i_int = AOUT_VAR_STEREO;
221 text.psz_string = N_("Stereo");
222 var_Change( p_aout, "audio-device",
223 VLC_VAR_ADDCHOICE, &val, &text );
224 var_Set( p_aout, "audio-device", val );
228 /* Close the previously opened device */
229 snd_pcm_close( p_sys->p_snd_pcm );
231 else if ( i_ret == -EBUSY )
233 msg_Warn( p_aout, "audio device: %s is already in use", psz_device );
236 /* Test for S/PDIF device if needed */
237 if ( psz_iec_device )
239 /* Opening the device should be enough */
240 if ( !(i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_iec_device,
241 SND_PCM_STREAM_PLAYBACK,
242 SND_PCM_NONBLOCK ) ) )
244 val.i_int = AOUT_VAR_SPDIF;
245 text.psz_string = N_("A/52 over S/PDIF");
246 var_Change( p_aout, "audio-device",
247 VLC_VAR_ADDCHOICE, &val, &text );
248 if( config_GetInt( p_aout, "spdif" ) )
249 var_Set( p_aout, "audio-device", val );
251 snd_pcm_close( p_sys->p_snd_pcm );
253 else if ( i_ret == -EBUSY )
255 msg_Warn( p_aout, "audio device: %s is already in use",
260 var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
263 /* Probe() has failed. */
264 msg_Dbg( p_aout, "failed to find a useable alsa configuration" );
265 var_Destroy( p_aout, "audio-device" );
269 /* Add final settings to the variable */
270 var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
271 val.b_bool = VLC_TRUE;
272 var_Set( p_aout, "intf-change", val );
275 /*****************************************************************************
276 * Open: create a handle and open an alsa device
277 *****************************************************************************
278 * This function opens an alsa device, through the alsa API.
280 * Note: the only heap-allocated string is psz_device. All the other pointers
281 * are references to psz_device or to stack-allocated data.
282 *****************************************************************************/
283 static int Open( vlc_object_t *p_this )
285 aout_instance_t * p_aout = (aout_instance_t *)p_this;
286 struct aout_sys_t * p_sys;
289 char psz_default_iec_device[128]; /* Buffer used to store the default
291 char * psz_device, * psz_iec_device; /* device names for PCM and S/PDIF
294 int i_vlc_pcm_format; /* Audio format for VLC's data */
295 int i_snd_pcm_format; /* Audio format for ALSA's data */
297 snd_pcm_uframes_t i_buffer_size = 0;
298 snd_pcm_uframes_t i_period_size = 0;
301 snd_pcm_hw_params_t *p_hw;
302 snd_pcm_sw_params_t *p_sw;
307 /* Allocate structures */
308 p_aout->output.p_sys = p_sys = malloc( sizeof( aout_sys_t ) );
311 msg_Err( p_aout, "out of memory" );
314 p_sys->b_playing = VLC_FALSE;
315 p_sys->start_date = 0;
316 p_sys->p_status = (snd_pcm_status_t *)malloc(snd_pcm_status_sizeof());
317 vlc_cond_init( p_aout, &p_sys->wait );
318 vlc_mutex_init( p_aout, &p_sys->lock );
320 /* Get device name */
321 if( (psz_device = config_GetPsz( p_aout, "alsadev" )) == NULL )
323 msg_Err( p_aout, "no audio device given (maybe \"default\" ?)" );
328 /* Choose the IEC device for S/PDIF output:
329 if the device is overriden by the user then it will be the one
330 otherwise we compute the default device based on the output format. */
331 if( AOUT_FMT_NON_LINEAR( &p_aout->output.output )
332 && !strcmp( psz_device, DEFAULT_ALSA_DEVICE ) )
334 snprintf( psz_default_iec_device, sizeof(psz_default_iec_device),
335 "iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x",
336 IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO,
337 IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER,
339 ( p_aout->output.output.i_rate == 48000 ?
340 IEC958_AES3_CON_FS_48000 :
341 ( p_aout->output.output.i_rate == 44100 ?
342 IEC958_AES3_CON_FS_44100 : IEC958_AES3_CON_FS_32000 ) ) );
343 psz_iec_device = psz_default_iec_device;
345 else if( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
347 psz_iec_device = psz_device;
351 psz_iec_device = NULL;
354 /* Choose the linear PCM format (read the comment above about FPU
356 if( p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU )
358 i_vlc_pcm_format = VLC_FOURCC('f','l','3','2');
359 i_snd_pcm_format = SND_PCM_FORMAT_FLOAT;
363 i_vlc_pcm_format = AOUT_FMT_S16_NE;
364 i_snd_pcm_format = SND_PCM_FORMAT_S16;
367 /* If the variable doesn't exist then it's the first time we're called
368 and we have to probe the available audio formats and channels */
369 if ( var_Type( p_aout, "audio-device" ) == 0 )
371 Probe( p_aout, psz_device, psz_iec_device, &i_snd_pcm_format );
372 switch( i_snd_pcm_format )
374 case SND_PCM_FORMAT_FLOAT:
375 i_vlc_pcm_format = VLC_FOURCC('f','l','3','2');
377 case SND_PCM_FORMAT_S16:
378 i_vlc_pcm_format = AOUT_FMT_S16_NE;
383 if ( var_Get( p_aout, "audio-device", &val ) < 0 )
390 if ( val.i_int == AOUT_VAR_SPDIF )
392 p_aout->output.output.i_format = VLC_FOURCC('s','p','d','i');
394 else if ( val.i_int == AOUT_VAR_5_1 )
396 p_aout->output.output.i_format = i_vlc_pcm_format;
397 p_aout->output.output.i_physical_channels
398 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
399 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
402 psz_device = strdup( "surround51" );
404 else if ( val.i_int == AOUT_VAR_2F2R )
406 p_aout->output.output.i_format = i_vlc_pcm_format;
407 p_aout->output.output.i_physical_channels
408 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
409 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
411 psz_device = strdup( "surround40" );
413 else if ( val.i_int == AOUT_VAR_STEREO )
415 p_aout->output.output.i_format = i_vlc_pcm_format;
416 p_aout->output.output.i_physical_channels
417 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
419 else if ( val.i_int == AOUT_VAR_MONO )
421 p_aout->output.output.i_format = i_vlc_pcm_format;
422 p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
427 /* This should not happen ! */
428 msg_Err( p_aout, "internal: can't find audio-device (%i)", val.i_int );
434 snd_output_stdio_attach( &p_sys->p_snd_stderr, stderr, 0 );
437 /* Open the device */
438 if ( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
440 if ( ( i_snd_rc = snd_pcm_open( &p_sys->p_snd_pcm, psz_iec_device,
441 SND_PCM_STREAM_PLAYBACK, 0 ) ) < 0 )
443 msg_Err( p_aout, "cannot open ALSA device `%s' (%s)",
444 psz_iec_device, snd_strerror( i_snd_rc ) );
449 i_buffer_size = ALSA_SPDIF_BUFFER_SIZE;
450 i_snd_pcm_format = SND_PCM_FORMAT_S16;
453 p_aout->output.i_nb_samples = i_period_size = ALSA_SPDIF_PERIOD_SIZE;
454 p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
455 p_aout->output.output.i_frame_length = A52_FRAME_NB;
457 aout_VolumeNoneInit( p_aout );
461 msg_Dbg( p_aout, "opening ALSA device `%s'", psz_device );
463 if ( ( i_snd_rc = snd_pcm_open( &p_sys->p_snd_pcm, psz_device,
464 SND_PCM_STREAM_PLAYBACK, 0 ) ) < 0 )
466 msg_Err( p_aout, "cannot open ALSA device `%s' (%s)",
467 psz_device, snd_strerror( i_snd_rc ) );
472 i_buffer_size = ALSA_DEFAULT_BUFFER_SIZE;
473 i_channels = aout_FormatNbChannels( &p_aout->output.output );
475 p_aout->output.i_nb_samples = i_period_size = ALSA_DEFAULT_PERIOD_SIZE;
477 aout_VolumeSoftInit( p_aout );
480 /* Free psz_device so that all the remaining data is stack-allocated */
483 p_aout->output.pf_play = Play;
485 snd_pcm_hw_params_alloca(&p_hw);
486 snd_pcm_sw_params_alloca(&p_sw);
488 /* Get Initial hardware parameters */
489 if ( ( i_snd_rc = snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) ) < 0 )
491 msg_Err( p_aout, "unable to retrieve initial hardware parameters (%s)",
492 snd_strerror( i_snd_rc ) );
497 if ( ( i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
498 i_snd_pcm_format ) ) < 0 )
500 msg_Err( p_aout, "unable to set stream sample size and word order (%s)",
501 snd_strerror( i_snd_rc ) );
505 if ( ( i_snd_rc = snd_pcm_hw_params_set_access( p_sys->p_snd_pcm, p_hw,
506 SND_PCM_ACCESS_RW_INTERLEAVED ) ) < 0 )
508 msg_Err( p_aout, "unable to set interleaved stream format (%s)",
509 snd_strerror( i_snd_rc ) );
514 if ( ( i_snd_rc = snd_pcm_hw_params_set_channels( p_sys->p_snd_pcm, p_hw,
517 msg_Err( p_aout, "unable to set number of output channels (%s)",
518 snd_strerror( i_snd_rc ) );
523 i_old_rate = p_aout->output.output.i_rate;
524 #ifdef HAVE_ALSA_NEW_API
525 i_snd_rc = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
526 &p_aout->output.output.i_rate,
529 i_snd_rc = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
530 p_aout->output.output.i_rate,
533 if( i_snd_rc < 0 || p_aout->output.output.i_rate != i_old_rate )
535 msg_Warn( p_aout, "The rate %d Hz is not supported by your hardware. "
536 "Using %d Hz instead.\n", i_old_rate,
537 p_aout->output.output.i_rate );
540 /* Set buffer size. */
541 #ifdef HAVE_ALSA_NEW_API
542 if ( ( i_snd_rc = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm,
543 p_hw, &i_buffer_size ) ) < 0 )
545 if ( ( i_snd_rc = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm,
546 p_hw, i_buffer_size ) ) < 0 )
549 msg_Err( p_aout, "unable to set buffer size (%s)",
550 snd_strerror( i_snd_rc ) );
554 /* Set period size. */
555 #ifdef HAVE_ALSA_NEW_API
556 if ( ( i_snd_rc = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm,
557 p_hw, &i_period_size, NULL ) ) < 0 )
559 if ( ( i_snd_rc = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm,
560 p_hw, i_period_size, NULL ) ) < 0 )
563 msg_Err( p_aout, "unable to set period size (%s)",
564 snd_strerror( i_snd_rc ) );
567 p_aout->output.i_nb_samples = i_period_size;
569 /* Commit hardware parameters. */
570 if ( ( i_snd_rc = snd_pcm_hw_params( p_sys->p_snd_pcm, p_hw ) ) < 0 )
572 msg_Err( p_aout, "unable to commit hardware configuration (%s)",
573 snd_strerror( i_snd_rc ) );
577 #ifdef HAVE_ALSA_NEW_API
578 if( ( i_snd_rc = snd_pcm_hw_params_get_period_time( p_hw,
579 &p_sys->i_period_time, NULL ) ) < 0 )
581 if( ( p_sys->i_period_time =
582 snd_pcm_hw_params_get_period_time( p_hw, NULL ) ) < 0 )
585 msg_Err( p_aout, "unable to get period time (%s)",
586 snd_strerror( i_snd_rc ) );
590 /* Get Initial software parameters */
591 snd_pcm_sw_params_current( p_sys->p_snd_pcm, p_sw );
593 i_snd_rc = snd_pcm_sw_params_set_sleep_min( p_sys->p_snd_pcm, p_sw, 0 );
595 i_snd_rc = snd_pcm_sw_params_set_avail_min( p_sys->p_snd_pcm, p_sw,
596 p_aout->output.i_nb_samples );
598 /* Commit software parameters. */
599 if ( snd_pcm_sw_params( p_sys->p_snd_pcm, p_sw ) < 0 )
601 msg_Err( p_aout, "unable to set software configuration" );
606 snd_output_printf( p_sys->p_snd_stderr, "\nALSA hardware setup:\n\n" );
607 snd_pcm_dump_hw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
608 snd_output_printf( p_sys->p_snd_stderr, "\nALSA software setup:\n\n" );
609 snd_pcm_dump_sw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
610 snd_output_printf( p_sys->p_snd_stderr, "\n" );
613 /* Create ALSA thread and wait for its readiness. */
614 if( vlc_thread_create( p_aout, "aout", ALSAThread,
615 VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
617 msg_Err( p_aout, "cannot create ALSA thread (%s)", strerror(errno) );
624 snd_pcm_close( p_sys->p_snd_pcm );
626 snd_output_close( p_sys->p_snd_stderr );
632 /*****************************************************************************
633 * Play: nothing to do
634 *****************************************************************************/
635 static void Play( aout_instance_t *p_aout )
637 if( !p_aout->output.p_sys->b_playing )
639 p_aout->output.p_sys->b_playing = 1;
641 /* get the playing date of the first aout buffer */
642 p_aout->output.p_sys->start_date =
643 aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
645 /* wake up the audio output thread */
646 vlc_mutex_lock( &p_aout->output.p_sys->lock );
647 vlc_cond_signal( &p_aout->output.p_sys->wait );
648 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
652 /*****************************************************************************
653 * Close: close the ALSA device
654 *****************************************************************************/
655 static void Close( vlc_object_t *p_this )
657 aout_instance_t *p_aout = (aout_instance_t *)p_this;
658 struct aout_sys_t * p_sys = p_aout->output.p_sys;
661 /* make sure the audio output thread is waken up */
662 vlc_mutex_lock( &p_aout->output.p_sys->lock );
663 vlc_cond_signal( &p_aout->output.p_sys->wait );
664 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
666 p_aout->b_die = VLC_TRUE;
667 vlc_thread_join( p_aout );
668 p_aout->b_die = VLC_FALSE;
670 i_snd_rc = snd_pcm_close( p_sys->p_snd_pcm );
674 msg_Err( p_aout, "failed closing ALSA device (%s)",
675 snd_strerror( i_snd_rc ) );
679 snd_output_close( p_sys->p_snd_stderr );
682 free( p_sys->p_status );
686 /*****************************************************************************
687 * ALSAThread: asynchronous thread used to DMA the data to the device
688 *****************************************************************************/
689 static int ALSAThread( aout_instance_t * p_aout )
691 /* Wait for the exact time to start playing (avoids resampling) */
692 vlc_mutex_lock( &p_aout->output.p_sys->lock );
693 if( !p_aout->output.p_sys->start_date )
694 vlc_cond_wait( &p_aout->output.p_sys->wait,
695 &p_aout->output.p_sys->lock );
696 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
698 mwait( p_aout->output.p_sys->start_date - AOUT_PTS_TOLERANCE / 4 );
700 while ( !p_aout->b_die )
708 /*****************************************************************************
709 * ALSAFill: function used to fill the ALSA buffer as much as possible
710 *****************************************************************************/
711 static void ALSAFill( aout_instance_t * p_aout )
713 struct aout_sys_t * p_sys = p_aout->output.p_sys;
715 aout_buffer_t * p_buffer;
716 snd_pcm_status_t * p_status = p_sys->p_status;
717 snd_timestamp_t ts_next;
721 /* Fill in the buffer until space or audio output buffer shortage */
724 i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
727 msg_Err( p_aout, "unable to get the device's status (%s)",
728 snd_strerror( i_snd_rc ) );
730 msleep( p_sys->i_period_time >> 1 );
734 /* Handle buffer underruns and reget the status */
735 if( snd_pcm_status_get_state( p_status ) == SND_PCM_STATE_XRUN )
737 /* Prepare the device */
738 i_snd_rc = snd_pcm_prepare( p_sys->p_snd_pcm );
742 msg_Warn( p_aout, "recovered from buffer underrun" );
744 /* Reget the status */
745 i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
748 msg_Err( p_aout, "unable to get the device's status after "
749 "recovery (%s)", snd_strerror( i_snd_rc ) );
751 msleep( p_sys->i_period_time >> 1 );
757 msg_Err( p_aout, "unable to recover from buffer underrun" );
759 msleep( p_sys->i_period_time >> 1 );
763 /* Underrun, try to recover as quickly as possible */
768 /* Here the device should be either in the RUNNING state.
769 * p_status is valid. */
771 snd_pcm_status_get_tstamp( p_status, &ts_next );
772 next_date = (mtime_t)ts_next.tv_sec * 1000000 + ts_next.tv_usec;
775 next_date += (mtime_t)snd_pcm_status_get_delay(p_status)
776 * 1000000 / p_aout->output.output.i_rate;
780 /* With screwed ALSA drivers the timestamp is always zero;
781 * use another method then */
782 snd_pcm_sframes_t delay;
785 if( !snd_pcm_delay( p_sys->p_snd_pcm, &delay ) )
787 i_bytes = snd_pcm_frames_to_bytes(p_sys->p_snd_pcm, delay);
789 next_date = mdate() + (mtime_t)i_bytes * 1000000
790 / p_aout->output.output.i_bytes_per_frame
791 / p_aout->output.output.i_rate
792 * p_aout->output.output.i_frame_length;
796 p_buffer = aout_OutputNextBuffer( p_aout, next_date,
797 (p_aout->output.output.i_format ==
798 VLC_FOURCC('s','p','d','i')) );
800 /* Audio output buffer shortage -> stop the fill process and wait */
801 if( p_buffer == NULL )
803 msleep( p_sys->i_period_time >> 1 );
807 i_snd_rc = snd_pcm_writei( p_sys->p_snd_pcm, p_buffer->p_buffer,
808 p_buffer->i_nb_samples );
812 msg_Err( p_aout, "write failed (%s)",
813 snd_strerror( i_snd_rc ) );
816 aout_BufferFree( p_buffer );
820 static void GetDevicesForCard(module_config_t *p_item, int i_card);
821 static void GetDevices( module_config_t *p_item );
823 /*****************************************************************************
824 * config variable callback
825 *****************************************************************************/
826 static int FindDevicesCallback( vlc_object_t *p_this, char const *psz_name,
827 vlc_value_t newval, vlc_value_t oldval, void *p_unused )
829 module_config_t *p_item;
832 p_item = config_FindConfig( p_this, psz_name );
833 if( !p_item ) return VLC_SUCCESS;
835 /* Clear-up the current list */
838 /* Keep the first entrie */
839 for( i = 1; i < p_item->i_list; i++ )
841 free( p_item->ppsz_list[i] );
842 free( p_item->ppsz_list_text[i] );
844 /* TODO: Remove when no more needed */
845 p_item->ppsz_list[i] = NULL;
846 p_item->ppsz_list_text[i] = NULL;
850 GetDevices( p_item );
852 /* Signal change to the interface */
853 p_item->b_dirty = VLC_TRUE;
860 static void GetDevicesForCard(module_config_t *p_item, int i_card)
862 int i_pcm_device = -1;
864 snd_pcm_info_t *p_pcm_info;
869 sprintf(psz_dev, "hw:%i", i_card);
871 if (( i_err = snd_ctl_open(&p_ctl, psz_dev, 0)) < 0 )
876 if ((i_err = snd_card_get_name(i_card, &psz_card_name)) != 0)
878 psz_card_name = _("Unknown soundcard");
881 snd_pcm_info_alloca(&p_pcm_info);
885 char *psz_device, *psz_descr;
886 if ((i_err = snd_ctl_pcm_next_device(p_ctl, &i_pcm_device)) < 0)
890 if ( i_pcm_device < 0 )
893 snd_pcm_info_set_device(p_pcm_info, i_pcm_device);
894 snd_pcm_info_set_subdevice(p_pcm_info, 0);
895 snd_pcm_info_set_stream(p_pcm_info, SND_PCM_STREAM_PLAYBACK);
897 if ((i_err = snd_ctl_pcm_info(p_ctl, p_pcm_info)) < 0)
899 if (i_err != -ENOENT)
901 /* printf("get_devices_for_card(): "
902 "snd_ctl_pcm_info() "
903 "failed (%d:%d): %s.\n", i_card,
904 i_pcm_device, snd_strerror(-i_err));*/
909 asprintf( &psz_device, "hw:%d,%d", i_card, i_pcm_device );
910 asprintf( &psz_descr, "%s: %s (%s)", psz_card_name,
911 snd_pcm_info_get_name(p_pcm_info), psz_device );
913 printf( "Adding device: %s\n", psz_descr );
916 (char **)realloc( p_item->ppsz_list,
917 (p_item->i_list + 2) * sizeof(char *) );
918 p_item->ppsz_list_text =
919 (char **)realloc( p_item->ppsz_list_text,
920 (p_item->i_list + 2) * sizeof(char *) );
921 p_item->ppsz_list[ p_item->i_list ] = psz_device;
922 p_item->ppsz_list_text[ p_item->i_list ] = psz_descr;
924 p_item->ppsz_list[ p_item->i_list ] = NULL;
925 p_item->ppsz_list_text[ p_item->i_list ] = NULL;
929 snd_ctl_close( p_ctl );
934 static void GetDevices( module_config_t *p_item )
939 if ((i_err = snd_card_next(&i_card)) != 0)
941 // g_warning("snd_next_card() failed: %s", snd_strerror(-err));
947 GetDevicesForCard(p_item, i_card);
948 if ((i_err = snd_card_next(&i_card)) != 0)
950 // g_warning("snd_next_card() failed: %s",
951 // snd_strerror(-err));