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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, 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;
307 vlc_bool_t b_retry = VLC_TRUE;
309 /* Allocate structures */
310 p_aout->output.p_sys = p_sys = malloc( sizeof( aout_sys_t ) );
313 msg_Err( p_aout, "out of memory" );
316 p_sys->b_playing = VLC_FALSE;
317 p_sys->start_date = 0;
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;
409 else if( val.i_int != AOUT_VAR_SPDIF )
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 /* Due to some bugs in alsa with some drivers, we need to retry in s16l
497 if snd_pcm_hw_params fails in fl32 */
502 /* Get Initial hardware parameters */
503 if ( ( i_snd_rc = snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) ) < 0 )
505 msg_Err( p_aout, "unable to retrieve initial hardware parameters (%s)",
506 snd_strerror( i_snd_rc ) );
511 if ( ( i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
512 i_snd_pcm_format ) ) < 0 )
514 if( i_snd_pcm_format != SND_PCM_FORMAT_S16 )
516 i_snd_pcm_format = SND_PCM_FORMAT_S16;
517 i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm,
518 p_hw, i_snd_pcm_format );
522 msg_Err( p_aout, "unable to set stream sample size and "
523 "word order (%s)", snd_strerror( i_snd_rc ) );
527 if( i_vlc_pcm_format != VLC_FOURCC('s','p','d','i') )
528 switch( i_snd_pcm_format )
530 case SND_PCM_FORMAT_FLOAT:
531 i_vlc_pcm_format = VLC_FOURCC('f','l','3','2');
533 case SND_PCM_FORMAT_S16:
534 i_vlc_pcm_format = AOUT_FMT_S16_NE;
537 p_aout->output.output.i_format = i_vlc_pcm_format;
539 if ( ( i_snd_rc = snd_pcm_hw_params_set_access( p_sys->p_snd_pcm, p_hw,
540 SND_PCM_ACCESS_RW_INTERLEAVED ) ) < 0 )
542 msg_Err( p_aout, "unable to set interleaved stream format (%s)",
543 snd_strerror( i_snd_rc ) );
548 if ( ( i_snd_rc = snd_pcm_hw_params_set_channels( p_sys->p_snd_pcm, p_hw,
551 msg_Err( p_aout, "unable to set number of output channels (%s)",
552 snd_strerror( i_snd_rc ) );
557 i_old_rate = p_aout->output.output.i_rate;
558 #ifdef HAVE_ALSA_NEW_API
559 i_snd_rc = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
560 &p_aout->output.output.i_rate,
563 i_snd_rc = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
564 p_aout->output.output.i_rate,
567 if( i_snd_rc < 0 || p_aout->output.output.i_rate != i_old_rate )
569 msg_Warn( p_aout, "The rate %d Hz is not supported by your hardware. "
570 "Using %d Hz instead.\n", i_old_rate,
571 p_aout->output.output.i_rate );
574 /* Set buffer size. */
575 #ifdef HAVE_ALSA_NEW_API
576 if ( ( i_snd_rc = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm,
577 p_hw, &i_buffer_size ) ) < 0 )
579 if ( ( i_snd_rc = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm,
580 p_hw, i_buffer_size ) ) < 0 )
583 msg_Err( p_aout, "unable to set buffer size (%s)",
584 snd_strerror( i_snd_rc ) );
588 /* Set period size. */
589 #ifdef HAVE_ALSA_NEW_API
590 if ( ( i_snd_rc = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm,
591 p_hw, &i_period_size, NULL ) ) < 0 )
593 if ( ( i_snd_rc = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm,
594 p_hw, i_period_size, NULL ) ) < 0 )
597 msg_Err( p_aout, "unable to set period size (%s)",
598 snd_strerror( i_snd_rc ) );
601 p_aout->output.i_nb_samples = i_period_size;
603 /* Commit hardware parameters. */
604 if ( ( i_snd_rc = snd_pcm_hw_params( p_sys->p_snd_pcm, p_hw ) ) < 0 )
606 if ( b_retry == VLC_FALSE &&
607 i_snd_pcm_format == SND_PCM_FORMAT_FLOAT)
610 i_snd_pcm_format = SND_PCM_FORMAT_S16;
611 p_aout->output.output.i_format = AOUT_FMT_S16_NE;
612 msg_Warn( p_aout, "unable to commit hardware configuration "
613 "with fl32 samples. Retrying with s16l (%s)", snd_strerror( i_snd_rc ) );
617 msg_Err( p_aout, "unable to commit hardware configuration (%s)",
618 snd_strerror( i_snd_rc ) );
624 #ifdef HAVE_ALSA_NEW_API
625 if( ( i_snd_rc = snd_pcm_hw_params_get_period_time( p_hw,
626 &p_sys->i_period_time, NULL ) ) < 0 )
628 if( ( p_sys->i_period_time =
629 (int)snd_pcm_hw_params_get_period_time( p_hw, NULL ) ) < 0 )
632 msg_Err( p_aout, "unable to get period time (%s)",
633 snd_strerror( i_snd_rc ) );
637 /* Get Initial software parameters */
638 snd_pcm_sw_params_current( p_sys->p_snd_pcm, p_sw );
640 i_snd_rc = snd_pcm_sw_params_set_sleep_min( p_sys->p_snd_pcm, p_sw, 0 );
642 i_snd_rc = snd_pcm_sw_params_set_avail_min( p_sys->p_snd_pcm, p_sw,
643 p_aout->output.i_nb_samples );
645 /* Commit software parameters. */
646 if ( snd_pcm_sw_params( p_sys->p_snd_pcm, p_sw ) < 0 )
648 msg_Err( p_aout, "unable to set software configuration" );
653 snd_output_printf( p_sys->p_snd_stderr, "\nALSA hardware setup:\n\n" );
654 snd_pcm_dump_hw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
655 snd_output_printf( p_sys->p_snd_stderr, "\nALSA software setup:\n\n" );
656 snd_pcm_dump_sw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
657 snd_output_printf( p_sys->p_snd_stderr, "\n" );
660 /* Create ALSA thread and wait for its readiness. */
661 if( vlc_thread_create( p_aout, "aout", ALSAThread,
662 VLC_THREAD_PRIORITY_OUTPUT, VLC_FALSE ) )
664 msg_Err( p_aout, "cannot create ALSA thread (%s)", strerror(errno) );
671 snd_pcm_close( p_sys->p_snd_pcm );
673 snd_output_close( p_sys->p_snd_stderr );
679 /*****************************************************************************
680 * Play: nothing to do
681 *****************************************************************************/
682 static void Play( aout_instance_t *p_aout )
684 if( !p_aout->output.p_sys->b_playing )
686 p_aout->output.p_sys->b_playing = 1;
688 /* get the playing date of the first aout buffer */
689 p_aout->output.p_sys->start_date =
690 aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
692 /* wake up the audio output thread */
693 vlc_mutex_lock( &p_aout->output.p_sys->lock );
694 vlc_cond_signal( &p_aout->output.p_sys->wait );
695 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
699 /*****************************************************************************
700 * Close: close the ALSA device
701 *****************************************************************************/
702 static void Close( vlc_object_t *p_this )
704 aout_instance_t *p_aout = (aout_instance_t *)p_this;
705 struct aout_sys_t * p_sys = p_aout->output.p_sys;
708 /* make sure the audio output thread is waken up */
709 vlc_mutex_lock( &p_aout->output.p_sys->lock );
710 vlc_cond_signal( &p_aout->output.p_sys->wait );
711 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
713 p_aout->b_die = VLC_TRUE;
714 vlc_thread_join( p_aout );
715 p_aout->b_die = VLC_FALSE;
717 i_snd_rc = snd_pcm_close( p_sys->p_snd_pcm );
721 msg_Err( p_aout, "failed closing ALSA device (%s)",
722 snd_strerror( i_snd_rc ) );
726 snd_output_close( p_sys->p_snd_stderr );
732 /*****************************************************************************
733 * ALSAThread: asynchronous thread used to DMA the data to the device
734 *****************************************************************************/
735 static int ALSAThread( aout_instance_t * p_aout )
737 p_aout->output.p_sys->p_status =
738 (snd_pcm_status_t *)malloc(snd_pcm_status_sizeof());
740 /* Wait for the exact time to start playing (avoids resampling) */
741 vlc_mutex_lock( &p_aout->output.p_sys->lock );
742 if( !p_aout->output.p_sys->start_date )
743 vlc_cond_wait( &p_aout->output.p_sys->wait,
744 &p_aout->output.p_sys->lock );
745 vlc_mutex_unlock( &p_aout->output.p_sys->lock );
747 mwait( p_aout->output.p_sys->start_date - AOUT_PTS_TOLERANCE / 4 );
749 while ( !p_aout->b_die )
754 free( p_aout->output.p_sys->p_status );
758 /*****************************************************************************
759 * ALSAFill: function used to fill the ALSA buffer as much as possible
760 *****************************************************************************/
761 static void ALSAFill( aout_instance_t * p_aout )
763 struct aout_sys_t * p_sys = p_aout->output.p_sys;
765 aout_buffer_t * p_buffer;
766 snd_pcm_status_t * p_status = p_sys->p_status;
767 snd_timestamp_t ts_next;
771 /* Fill in the buffer until space or audio output buffer shortage */
774 i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
777 msg_Err( p_aout, "unable to get the device's status (%s)",
778 snd_strerror( i_snd_rc ) );
780 msleep( p_sys->i_period_time >> 1 );
784 /* Handle buffer underruns and reget the status */
785 if( snd_pcm_status_get_state( p_status ) == SND_PCM_STATE_XRUN )
787 /* Prepare the device */
788 i_snd_rc = snd_pcm_prepare( p_sys->p_snd_pcm );
792 msg_Dbg( p_aout, "recovered from buffer underrun" );
794 /* Reget the status */
795 i_snd_rc = snd_pcm_status( p_sys->p_snd_pcm, p_status );
798 msg_Err( p_aout, "unable to get the device's status after "
799 "recovery (%s)", snd_strerror( i_snd_rc ) );
801 msleep( p_sys->i_period_time >> 1 );
807 msg_Err( p_aout, "unable to recover from buffer underrun" );
809 msleep( p_sys->i_period_time >> 1 );
813 /* Underrun, try to recover as quickly as possible */
818 /* Here the device should be either in the RUNNING state.
819 * p_status is valid. */
821 snd_pcm_status_get_tstamp( p_status, &ts_next );
822 next_date = (mtime_t)ts_next.tv_sec * 1000000 + ts_next.tv_usec;
825 next_date += (mtime_t)snd_pcm_status_get_delay(p_status)
826 * 1000000 / p_aout->output.output.i_rate;
830 /* With screwed ALSA drivers the timestamp is always zero;
831 * use another method then */
832 snd_pcm_sframes_t delay;
835 if( !snd_pcm_delay( p_sys->p_snd_pcm, &delay ) )
837 i_bytes = snd_pcm_frames_to_bytes(p_sys->p_snd_pcm, delay);
839 next_date = mdate() + (mtime_t)i_bytes * 1000000
840 / p_aout->output.output.i_bytes_per_frame
841 / p_aout->output.output.i_rate
842 * p_aout->output.output.i_frame_length;
846 p_buffer = aout_OutputNextBuffer( p_aout, next_date,
847 (p_aout->output.output.i_format ==
848 VLC_FOURCC('s','p','d','i')) );
850 /* Audio output buffer shortage -> stop the fill process and wait */
851 if( p_buffer == NULL )
853 msleep( p_sys->i_period_time >> 1 );
857 i_snd_rc = snd_pcm_writei( p_sys->p_snd_pcm, p_buffer->p_buffer,
858 p_buffer->i_nb_samples );
862 msg_Err( p_aout, "write failed (%s)",
863 snd_strerror( i_snd_rc ) );
866 aout_BufferFree( p_buffer );
870 static void GetDevicesForCard(module_config_t *p_item, int i_card);
871 static void GetDevices( module_config_t *p_item );
873 /*****************************************************************************
874 * config variable callback
875 *****************************************************************************/
876 static int FindDevicesCallback( vlc_object_t *p_this, char const *psz_name,
877 vlc_value_t newval, vlc_value_t oldval, void *p_unused )
879 module_config_t *p_item;
882 p_item = config_FindConfig( p_this, psz_name );
883 if( !p_item ) return VLC_SUCCESS;
885 /* Clear-up the current list */
888 /* Keep the first entrie */
889 for( i = 1; i < p_item->i_list; i++ )
891 free( p_item->ppsz_list[i] );
892 free( p_item->ppsz_list_text[i] );
894 /* TODO: Remove when no more needed */
895 p_item->ppsz_list[i] = NULL;
896 p_item->ppsz_list_text[i] = NULL;
900 GetDevices( p_item );
902 /* Signal change to the interface */
903 p_item->b_dirty = VLC_TRUE;
910 static void GetDevicesForCard(module_config_t *p_item, int i_card)
912 int i_pcm_device = -1;
914 snd_pcm_info_t *p_pcm_info;
919 sprintf(psz_dev, "hw:%i", i_card);
921 if (( i_err = snd_ctl_open(&p_ctl, psz_dev, 0)) < 0 )
926 if ((i_err = snd_card_get_name(i_card, &psz_card_name)) != 0)
928 psz_card_name = _("Unknown soundcard");
931 snd_pcm_info_alloca(&p_pcm_info);
935 char *psz_device, *psz_descr;
936 if ((i_err = snd_ctl_pcm_next_device(p_ctl, &i_pcm_device)) < 0)
940 if ( i_pcm_device < 0 )
943 snd_pcm_info_set_device(p_pcm_info, i_pcm_device);
944 snd_pcm_info_set_subdevice(p_pcm_info, 0);
945 snd_pcm_info_set_stream(p_pcm_info, SND_PCM_STREAM_PLAYBACK);
947 if ((i_err = snd_ctl_pcm_info(p_ctl, p_pcm_info)) < 0)
949 if (i_err != -ENOENT)
951 /* printf("get_devices_for_card(): "
952 "snd_ctl_pcm_info() "
953 "failed (%d:%d): %s.\n", i_card,
954 i_pcm_device, snd_strerror(-i_err));*/
959 asprintf( &psz_device, "hw:%d,%d", i_card, i_pcm_device );
960 asprintf( &psz_descr, "%s: %s (%s)", psz_card_name,
961 snd_pcm_info_get_name(p_pcm_info), psz_device );
964 (char **)realloc( p_item->ppsz_list,
965 (p_item->i_list + 2) * sizeof(char *) );
966 p_item->ppsz_list_text =
967 (char **)realloc( p_item->ppsz_list_text,
968 (p_item->i_list + 2) * sizeof(char *) );
969 p_item->ppsz_list[ p_item->i_list ] = psz_device;
970 p_item->ppsz_list_text[ p_item->i_list ] = psz_descr;
972 p_item->ppsz_list[ p_item->i_list ] = NULL;
973 p_item->ppsz_list_text[ p_item->i_list ] = NULL;
977 snd_ctl_close( p_ctl );
982 static void GetDevices( module_config_t *p_item )
987 if ((i_err = snd_card_next(&i_card)) != 0)
989 // g_warning("snd_next_card() failed: %s", snd_strerror(-err));
995 GetDevicesForCard(p_item, i_card);
996 if ((i_err = snd_card_next(&i_card)) != 0)
998 // g_warning("snd_next_card() failed: %s",
999 // snd_strerror(-err));