1 /*****************************************************************************
2 * alsa.c : alsa plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2001 the VideoLAN team
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;
55 unsigned int i_period_time;
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") );
112 set_capability( "audio output", 150 );
113 set_callbacks( Open, Close );
116 /*****************************************************************************
117 * Probe: probe the audio device for available formats and channels
118 *****************************************************************************/
119 static void Probe( aout_instance_t * p_aout,
120 const char * psz_device, const char * psz_iec_device,
121 int *pi_snd_pcm_format )
123 struct aout_sys_t * p_sys = p_aout->output.p_sys;
124 vlc_value_t val, text;
127 var_Create ( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
128 text.psz_string = _("Audio Device");
129 var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
131 /* We'll open the audio device in non blocking mode so we can just exit
132 * when it is already in use, but for the real stuff we'll still use
133 * the blocking mode */
135 /* Now test linear PCM capabilities */
136 if ( !(i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_device,
137 SND_PCM_STREAM_PLAYBACK,
138 SND_PCM_NONBLOCK ) ) )
141 snd_pcm_hw_params_t * p_hw;
142 snd_pcm_hw_params_alloca (&p_hw);
144 if ( snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) < 0 )
146 msg_Warn( p_aout, "unable to retrieve initial hardware parameters"
147 ", disabling linear PCM audio" );
148 snd_pcm_close( p_sys->p_snd_pcm );
149 var_Destroy( p_aout, "audio-device" );
153 if ( snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
154 *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 i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm,
162 p_hw, *pi_snd_pcm_format );
166 msg_Warn( p_aout, "unable to set stream sample size and "
167 "word order, disabling linear PCM audio" );
168 snd_pcm_close( p_sys->p_snd_pcm );
169 var_Destroy( p_aout, "audio-device" );
174 i_channels = aout_FormatNbChannels( &p_aout->output.output );
176 while ( i_channels > 0 )
178 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw,
181 switch ( i_channels )
184 val.i_int = AOUT_VAR_MONO;
185 text.psz_string = N_("Mono");
186 var_Change( p_aout, "audio-device",
187 VLC_VAR_ADDCHOICE, &val, &text );
190 val.i_int = AOUT_VAR_STEREO;
191 text.psz_string = N_("Stereo");
192 var_Change( p_aout, "audio-device",
193 VLC_VAR_ADDCHOICE, &val, &text );
194 var_Set( p_aout, "audio-device", val );
197 val.i_int = AOUT_VAR_2F2R;
198 text.psz_string = N_("2 Front 2 Rear");
199 var_Change( p_aout, "audio-device",
200 VLC_VAR_ADDCHOICE, &val, &text );
203 val.i_int = AOUT_VAR_5_1;
204 text.psz_string = N_("5.1");
205 var_Change( p_aout, "audio-device",
206 VLC_VAR_ADDCHOICE, &val, &text );
214 /* Special case for mono on stereo only boards */
215 i_channels = aout_FormatNbChannels( &p_aout->output.output );
216 var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
217 if( val.i_int <= 0 && i_channels == 1 )
219 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw, 2 ))
221 val.i_int = AOUT_VAR_STEREO;
222 text.psz_string = N_("Stereo");
223 var_Change( p_aout, "audio-device",
224 VLC_VAR_ADDCHOICE, &val, &text );
225 var_Set( p_aout, "audio-device", val );
229 /* Close the previously opened device */
230 snd_pcm_close( p_sys->p_snd_pcm );
232 else if ( i_ret == -EBUSY )
234 msg_Warn( p_aout, "audio device: %s is already in use", psz_device );
237 /* Test for S/PDIF device if needed */
238 if ( psz_iec_device )
240 /* Opening the device should be enough */
241 if ( !(i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_iec_device,
242 SND_PCM_STREAM_PLAYBACK,
243 SND_PCM_NONBLOCK ) ) )
245 val.i_int = AOUT_VAR_SPDIF;
246 text.psz_string = N_("A/52 over S/PDIF");
247 var_Change( p_aout, "audio-device",
248 VLC_VAR_ADDCHOICE, &val, &text );
249 if( config_GetInt( p_aout, "spdif" ) )
250 var_Set( p_aout, "audio-device", val );
252 snd_pcm_close( p_sys->p_snd_pcm );
254 else if ( i_ret == -EBUSY )
256 msg_Warn( p_aout, "audio device: %s is already in use",
261 var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
264 /* Probe() has failed. */
265 msg_Dbg( p_aout, "failed to find a useable alsa configuration" );
266 var_Destroy( p_aout, "audio-device" );
270 /* Add final settings to the variable */
271 var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
272 val.b_bool = VLC_TRUE;
273 var_Set( p_aout, "intf-change", val );
276 /*****************************************************************************
277 * Open: create a handle and open an alsa device
278 *****************************************************************************
279 * This function opens an alsa device, through the alsa API.
281 * Note: the only heap-allocated string is psz_device. All the other pointers
282 * are references to psz_device or to stack-allocated data.
283 *****************************************************************************/
284 static int Open( vlc_object_t *p_this )
286 aout_instance_t * p_aout = (aout_instance_t *)p_this;
287 struct aout_sys_t * p_sys;
290 char psz_default_iec_device[128]; /* Buffer used to store the default
292 char * psz_device, * psz_iec_device; /* device names for PCM and S/PDIF
295 int i_vlc_pcm_format; /* Audio format for VLC's data */
296 int i_snd_pcm_format; /* Audio format for ALSA's data */
298 snd_pcm_uframes_t i_buffer_size = 0;
299 snd_pcm_uframes_t i_period_size = 0;
302 snd_pcm_hw_params_t *p_hw;
303 snd_pcm_sw_params_t *p_sw;
306 unsigned int i_old_rate;
308 /* Allocate structures */
309 p_aout->output.p_sys = p_sys = malloc( sizeof( aout_sys_t ) );
312 msg_Err( p_aout, "out of memory" );
315 p_sys->b_playing = VLC_FALSE;
316 p_sys->start_date = 0;
317 p_sys->p_status = (snd_pcm_status_t *)malloc(snd_pcm_status_sizeof());
318 vlc_cond_init( p_aout, &p_sys->wait );
319 vlc_mutex_init( p_aout, &p_sys->lock );
321 /* Get device name */
322 if( (psz_device = config_GetPsz( p_aout, "alsadev" )) == NULL )
324 msg_Err( p_aout, "no audio device given (maybe \"default\" ?)" );
329 /* Choose the IEC device for S/PDIF output:
330 if the device is overriden by the user then it will be the one
331 otherwise we compute the default device based on the output format. */
332 if( AOUT_FMT_NON_LINEAR( &p_aout->output.output )
333 && !strcmp( psz_device, DEFAULT_ALSA_DEVICE ) )
335 snprintf( psz_default_iec_device, sizeof(psz_default_iec_device),
336 "iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x",
337 IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO,
338 IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER,
340 ( p_aout->output.output.i_rate == 48000 ?
341 IEC958_AES3_CON_FS_48000 :
342 ( p_aout->output.output.i_rate == 44100 ?
343 IEC958_AES3_CON_FS_44100 : IEC958_AES3_CON_FS_32000 ) ) );
344 psz_iec_device = psz_default_iec_device;
346 else if( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
348 psz_iec_device = psz_device;
352 psz_iec_device = NULL;
355 /* Choose the linear PCM format (read the comment above about FPU
357 if( p_aout->p_libvlc->i_cpu & CPU_CAPABILITY_FPU )
359 i_vlc_pcm_format = VLC_FOURCC('f','l','3','2');
360 i_snd_pcm_format = SND_PCM_FORMAT_FLOAT;
364 i_vlc_pcm_format = AOUT_FMT_S16_NE;
365 i_snd_pcm_format = SND_PCM_FORMAT_S16;
368 /* If the variable doesn't exist then it's the first time we're called
369 and we have to probe the available audio formats and channels */
370 if ( var_Type( p_aout, "audio-device" ) == 0 )
372 Probe( p_aout, psz_device, psz_iec_device, &i_snd_pcm_format );
375 if ( var_Get( p_aout, "audio-device", &val ) < 0 )
382 p_aout->output.output.i_format = i_vlc_pcm_format;
383 if ( val.i_int == AOUT_VAR_5_1 )
385 p_aout->output.output.i_physical_channels
386 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
387 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
390 psz_device = strdup( "surround51" );
392 else if ( val.i_int == AOUT_VAR_2F2R )
394 p_aout->output.output.i_physical_channels
395 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
396 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
398 psz_device = strdup( "surround40" );
400 else if ( val.i_int == AOUT_VAR_STEREO )
402 p_aout->output.output.i_physical_channels
403 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
405 else if ( val.i_int == AOUT_VAR_MONO )
407 p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
411 /* This should not happen ! */
412 msg_Err( p_aout, "internal: can't find audio-device (%i)", val.i_int );
419 snd_output_stdio_attach( &p_sys->p_snd_stderr, stderr, 0 );
422 /* Open the device */
423 if ( val.i_int == AOUT_VAR_SPDIF )
425 if ( ( i_snd_rc = snd_pcm_open( &p_sys->p_snd_pcm, psz_iec_device,
426 SND_PCM_STREAM_PLAYBACK, 0 ) ) < 0 )
428 msg_Err( p_aout, "cannot open ALSA device `%s' (%s)",
429 psz_iec_device, snd_strerror( i_snd_rc ) );
434 i_buffer_size = ALSA_SPDIF_BUFFER_SIZE;
435 i_snd_pcm_format = SND_PCM_FORMAT_S16;
438 i_vlc_pcm_format = VLC_FOURCC('s','p','d','i');
439 p_aout->output.i_nb_samples = i_period_size = ALSA_SPDIF_PERIOD_SIZE;
440 p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
441 p_aout->output.output.i_frame_length = A52_FRAME_NB;
443 aout_VolumeNoneInit( p_aout );
449 msg_Dbg( p_aout, "opening ALSA device `%s'", psz_device );
451 /* Since it seems snd_pcm_close hasen't really released the device at
452 the time it returns, probe if the device is available in loop for 1s.
453 We cannot use blocking mode since the we would wait indefinitely when
454 switching from a dmx device to surround51. */
456 for( i = 10; i >= 0; i-- )
458 if ( ( i_snd_rc = snd_pcm_open( &p_sys->p_snd_pcm, psz_device,
459 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK ) ) == -EBUSY )
461 if( i ) msleep( 100000 /* 100ms */ );
462 else msg_Err( p_aout, "audio device: %s is already in use",
470 msg_Err( p_aout, "cannot open ALSA device `%s' (%s)",
471 psz_device, snd_strerror( i_snd_rc ) );
477 /* We want blocking mode */
478 snd_pcm_nonblock( p_sys->p_snd_pcm, 0 );
480 i_buffer_size = ALSA_DEFAULT_BUFFER_SIZE;
481 i_channels = aout_FormatNbChannels( &p_aout->output.output );
483 p_aout->output.i_nb_samples = i_period_size = ALSA_DEFAULT_PERIOD_SIZE;
485 aout_VolumeSoftInit( p_aout );
488 /* Free psz_device so that all the remaining data is stack-allocated */
491 p_aout->output.pf_play = Play;
493 snd_pcm_hw_params_alloca(&p_hw);
494 snd_pcm_sw_params_alloca(&p_sw);
496 /* Get Initial hardware parameters */
497 if ( ( i_snd_rc = snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) ) < 0 )
499 msg_Err( p_aout, "unable to retrieve initial hardware parameters (%s)",
500 snd_strerror( i_snd_rc ) );
505 i_old_rate = p_aout->output.output.i_rate;
506 #ifdef HAVE_ALSA_NEW_API
507 i_snd_rc = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
508 &(p_aout->output.output.i_rate),
511 i_snd_rc = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
512 p_aout->output.output.i_rate,
515 if( i_snd_rc < 0 || p_aout->output.output.i_rate != i_old_rate )
517 msg_Warn( p_aout, "The rate %d Hz is not supported by your hardware. "
518 "Using %d Hz instead.\n", i_old_rate,
519 p_aout->output.output.i_rate );
523 if ( ( i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
524 i_snd_pcm_format ) ) < 0 )
526 if( i_snd_pcm_format != SND_PCM_FORMAT_S16 )
528 i_snd_pcm_format = SND_PCM_FORMAT_S16;
529 i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm,
530 p_hw, i_snd_pcm_format );
534 msg_Err( p_aout, "unable to set stream sample size and "
535 "word order (%s)", snd_strerror( i_snd_rc ) );
539 if( i_vlc_pcm_format != VLC_FOURCC('s','p','d','i') )
540 switch( i_snd_pcm_format )
542 case SND_PCM_FORMAT_FLOAT:
543 i_vlc_pcm_format = VLC_FOURCC('f','l','3','2');
545 case SND_PCM_FORMAT_S16:
546 i_vlc_pcm_format = AOUT_FMT_S16_NE;
549 p_aout->output.output.i_format = i_vlc_pcm_format;
551 if ( ( i_snd_rc = snd_pcm_hw_params_set_access( p_sys->p_snd_pcm, p_hw,
552 SND_PCM_ACCESS_RW_INTERLEAVED ) ) < 0 )
554 msg_Err( p_aout, "unable to set interleaved stream format (%s)",
555 snd_strerror( i_snd_rc ) );
560 if ( ( i_snd_rc = snd_pcm_hw_params_set_channels( p_sys->p_snd_pcm, p_hw,
563 msg_Err( p_aout, "unable to set number of output channels (%s)",
564 snd_strerror( i_snd_rc ) );
568 /* Set buffer size. */
569 #ifdef HAVE_ALSA_NEW_API
570 if ( ( i_snd_rc = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm,
571 p_hw, &i_buffer_size ) ) < 0 )
573 if ( ( i_snd_rc = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm,
574 p_hw, i_buffer_size ) ) < 0 )
577 msg_Err( p_aout, "unable to set buffer size (%s)",
578 snd_strerror( i_snd_rc ) );
582 /* Set period size. */
583 #ifdef HAVE_ALSA_NEW_API
584 if ( ( i_snd_rc = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm,
585 p_hw, &i_period_size, NULL ) ) < 0 )
587 if ( ( i_snd_rc = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm,
588 p_hw, i_period_size, NULL ) ) < 0 )
591 msg_Err( p_aout, "unable to set period size (%s)",
592 snd_strerror( i_snd_rc ) );
595 p_aout->output.i_nb_samples = i_period_size;
597 /* Commit hardware parameters. */
598 if ( ( i_snd_rc = snd_pcm_hw_params( p_sys->p_snd_pcm, p_hw ) ) < 0 )
600 msg_Err( p_aout, "unable to commit hardware configuration (%s)",
601 snd_strerror( i_snd_rc ) );
605 #ifdef HAVE_ALSA_NEW_API
606 if( ( i_snd_rc = snd_pcm_hw_params_get_period_time( p_hw,
607 &p_sys->i_period_time, NULL ) ) < 0 )
609 if( ( p_sys->i_period_time =
610 (int)snd_pcm_hw_params_get_period_time( p_hw, NULL ) ) < 0 )
613 msg_Err( p_aout, "unable to get period time (%s)",
614 snd_strerror( i_snd_rc ) );
618 /* Get Initial software parameters */
619 snd_pcm_sw_params_current( p_sys->p_snd_pcm, p_sw );
621 i_snd_rc = snd_pcm_sw_params_set_sleep_min( p_sys->p_snd_pcm, p_sw, 0 );
623 i_snd_rc = snd_pcm_sw_params_set_avail_min( p_sys->p_snd_pcm, p_sw,
624 p_aout->output.i_nb_samples );
626 /* Commit software parameters. */
627 if ( snd_pcm_sw_params( p_sys->p_snd_pcm, p_sw ) < 0 )
629 msg_Err( p_aout, "unable to set software configuration" );
634 snd_output_printf( p_sys->p_snd_stderr, "\nALSA hardware setup:\n\n" );
635 snd_pcm_dump_hw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
636 snd_output_printf( p_sys->p_snd_stderr, "\nALSA software setup:\n\n" );
637 snd_pcm_dump_sw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
638 snd_output_printf( p_sys->p_snd_stderr, "\n" );
641 /* Create ALSA thread and wait for its readiness. */
642 if( vlc_thread_create( p_aout, "aout", ALSAThread,
643 VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
645 msg_Err( p_aout, "cannot create ALSA thread (%s)", strerror(errno) );
652 snd_pcm_close( p_sys->p_snd_pcm );
654 snd_output_close( p_sys->p_snd_stderr );
660 /*****************************************************************************
661 * Play: nothing to do
662 *****************************************************************************/
663 static void Play( aout_instance_t *p_aout )
665 if( !p_aout->output.p_sys->b_playing )
667 p_aout->output.p_sys->b_playing = 1;
669 /* get the playing date of the first aout buffer */
670 p_aout->output.p_sys->start_date =
671 aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
673 /* wake up the audio output thread */
674 vlc_mutex_lock( &p_aout->output.p_sys->lock );
675 vlc_cond_signal( &p_aout->output.p_sys->wait );
676 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
680 /*****************************************************************************
681 * Close: close the ALSA device
682 *****************************************************************************/
683 static void Close( vlc_object_t *p_this )
685 aout_instance_t *p_aout = (aout_instance_t *)p_this;
686 struct aout_sys_t * p_sys = p_aout->output.p_sys;
689 /* make sure the audio output thread is waken up */
690 vlc_mutex_lock( &p_aout->output.p_sys->lock );
691 vlc_cond_signal( &p_aout->output.p_sys->wait );
692 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
694 p_aout->b_die = VLC_TRUE;
695 vlc_thread_join( p_aout );
696 p_aout->b_die = VLC_FALSE;
698 i_snd_rc = snd_pcm_close( p_sys->p_snd_pcm );
702 msg_Err( p_aout, "failed closing ALSA device (%s)",
703 snd_strerror( i_snd_rc ) );
707 snd_output_close( p_sys->p_snd_stderr );
710 free( p_sys->p_status );
714 /*****************************************************************************
715 * ALSAThread: asynchronous thread used to DMA the data to the device
716 *****************************************************************************/
717 static int ALSAThread( aout_instance_t * p_aout )
719 /* Wait for the exact time to start playing (avoids resampling) */
720 vlc_mutex_lock( &p_aout->output.p_sys->lock );
721 if( !p_aout->output.p_sys->start_date )
722 vlc_cond_wait( &p_aout->output.p_sys->wait,
723 &p_aout->output.p_sys->lock );
724 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
726 mwait( p_aout->output.p_sys->start_date - AOUT_PTS_TOLERANCE / 4 );
728 while ( !p_aout->b_die )
736 /*****************************************************************************
737 * ALSAFill: function used to fill the ALSA buffer as much as possible
738 *****************************************************************************/
739 static void ALSAFill( aout_instance_t * p_aout )
741 struct aout_sys_t * p_sys = p_aout->output.p_sys;
743 aout_buffer_t * p_buffer;
744 snd_pcm_status_t * p_status = p_sys->p_status;
745 snd_timestamp_t ts_next;
749 /* Fill in the buffer until space or audio output buffer shortage */
752 i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
755 msg_Err( p_aout, "unable to get the device's status (%s)",
756 snd_strerror( i_snd_rc ) );
758 msleep( p_sys->i_period_time >> 1 );
762 /* Handle buffer underruns and reget the status */
763 if( snd_pcm_status_get_state( p_status ) == SND_PCM_STATE_XRUN )
765 /* Prepare the device */
766 i_snd_rc = snd_pcm_prepare( p_sys->p_snd_pcm );
770 msg_Warn( p_aout, "recovered from buffer underrun" );
772 /* Reget the status */
773 i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
776 msg_Err( p_aout, "unable to get the device's status after "
777 "recovery (%s)", snd_strerror( i_snd_rc ) );
779 msleep( p_sys->i_period_time >> 1 );
785 msg_Err( p_aout, "unable to recover from buffer underrun" );
787 msleep( p_sys->i_period_time >> 1 );
791 /* Underrun, try to recover as quickly as possible */
796 /* Here the device should be either in the RUNNING state.
797 * p_status is valid. */
799 snd_pcm_status_get_tstamp( p_status, &ts_next );
800 next_date = (mtime_t)ts_next.tv_sec * 1000000 + ts_next.tv_usec;
803 next_date += (mtime_t)snd_pcm_status_get_delay(p_status)
804 * 1000000 / p_aout->output.output.i_rate;
808 /* With screwed ALSA drivers the timestamp is always zero;
809 * use another method then */
810 snd_pcm_sframes_t delay;
813 if( !snd_pcm_delay( p_sys->p_snd_pcm, &delay ) )
815 i_bytes = snd_pcm_frames_to_bytes(p_sys->p_snd_pcm, delay);
817 next_date = mdate() + (mtime_t)i_bytes * 1000000
818 / p_aout->output.output.i_bytes_per_frame
819 / p_aout->output.output.i_rate
820 * p_aout->output.output.i_frame_length;
824 p_buffer = aout_OutputNextBuffer( p_aout, next_date,
825 (p_aout->output.output.i_format ==
826 VLC_FOURCC('s','p','d','i')) );
828 /* Audio output buffer shortage -> stop the fill process and wait */
829 if( p_buffer == NULL )
831 msleep( p_sys->i_period_time >> 1 );
835 i_snd_rc = snd_pcm_writei( p_sys->p_snd_pcm, p_buffer->p_buffer,
836 p_buffer->i_nb_samples );
840 msg_Err( p_aout, "write failed (%s)",
841 snd_strerror( i_snd_rc ) );
844 aout_BufferFree( p_buffer );
848 static void GetDevicesForCard(module_config_t *p_item, int i_card);
849 static void GetDevices( module_config_t *p_item );
851 /*****************************************************************************
852 * config variable callback
853 *****************************************************************************/
854 static int FindDevicesCallback( vlc_object_t *p_this, char const *psz_name,
855 vlc_value_t newval, vlc_value_t oldval, void *p_unused )
857 module_config_t *p_item;
860 p_item = config_FindConfig( p_this, psz_name );
861 if( !p_item ) return VLC_SUCCESS;
863 /* Clear-up the current list */
866 /* Keep the first entrie */
867 for( i = 1; i < p_item->i_list; i++ )
869 free( p_item->ppsz_list[i] );
870 free( p_item->ppsz_list_text[i] );
872 /* TODO: Remove when no more needed */
873 p_item->ppsz_list[i] = NULL;
874 p_item->ppsz_list_text[i] = NULL;
878 GetDevices( p_item );
880 /* Signal change to the interface */
881 p_item->b_dirty = VLC_TRUE;
888 static void GetDevicesForCard(module_config_t *p_item, int i_card)
890 int i_pcm_device = -1;
892 snd_pcm_info_t *p_pcm_info;
897 sprintf(psz_dev, "hw:%i", i_card);
899 if (( i_err = snd_ctl_open(&p_ctl, psz_dev, 0)) < 0 )
904 if ((i_err = snd_card_get_name(i_card, &psz_card_name)) != 0)
906 psz_card_name = _("Unknown soundcard");
909 snd_pcm_info_alloca(&p_pcm_info);
913 char *psz_device, *psz_descr;
914 if ((i_err = snd_ctl_pcm_next_device(p_ctl, &i_pcm_device)) < 0)
918 if ( i_pcm_device < 0 )
921 snd_pcm_info_set_device(p_pcm_info, i_pcm_device);
922 snd_pcm_info_set_subdevice(p_pcm_info, 0);
923 snd_pcm_info_set_stream(p_pcm_info, SND_PCM_STREAM_PLAYBACK);
925 if ((i_err = snd_ctl_pcm_info(p_ctl, p_pcm_info)) < 0)
927 if (i_err != -ENOENT)
929 /* printf("get_devices_for_card(): "
930 "snd_ctl_pcm_info() "
931 "failed (%d:%d): %s.\n", i_card,
932 i_pcm_device, snd_strerror(-i_err));*/
937 asprintf( &psz_device, "hw:%d,%d", i_card, i_pcm_device );
938 asprintf( &psz_descr, "%s: %s (%s)", psz_card_name,
939 snd_pcm_info_get_name(p_pcm_info), psz_device );
942 (char **)realloc( p_item->ppsz_list,
943 (p_item->i_list + 2) * sizeof(char *) );
944 p_item->ppsz_list_text =
945 (char **)realloc( p_item->ppsz_list_text,
946 (p_item->i_list + 2) * sizeof(char *) );
947 p_item->ppsz_list[ p_item->i_list ] = psz_device;
948 p_item->ppsz_list_text[ p_item->i_list ] = psz_descr;
950 p_item->ppsz_list[ p_item->i_list ] = NULL;
951 p_item->ppsz_list_text[ p_item->i_list ] = NULL;
955 snd_ctl_close( p_ctl );
960 static void GetDevices( module_config_t *p_item )
965 if ((i_err = snd_card_next(&i_card)) != 0)
967 // g_warning("snd_next_card() failed: %s", snd_strerror(-err));
973 GetDevicesForCard(p_item, i_card);
974 if ((i_err = snd_card_next(&i_card)) != 0)
976 // g_warning("snd_next_card() failed: %s",
977 // snd_strerror(-err));