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 *****************************************************************************/
36 #include <vlc_common.h>
37 #include <vlc_plugin.h>
39 #include <errno.h> /* ENOMEM */
40 #include <vlc_dialog.h>
46 Note: we use the new API which is available since 0.9.0beta10a. */
47 #define ALSA_PCM_NEW_HW_PARAMS_API
48 #define ALSA_PCM_NEW_SW_PARAMS_API
49 #include <alsa/asoundlib.h>
50 #include <alsa/version.h>
52 /*#define ALSA_DEBUG*/
54 /*****************************************************************************
55 * aout_sys_t: ALSA audio output method descriptor
56 *****************************************************************************
57 * This structure is part of the audio output thread descriptor.
58 * It describes the ALSA specific properties of an audio device.
59 *****************************************************************************/
62 snd_pcm_t * p_snd_pcm;
63 unsigned int i_period_time;
66 snd_output_t * p_snd_stderr;
74 #define A52_FRAME_NB 1536
76 /* These values are in frames.
77 To convert them to a number of bytes you have to multiply them by the
78 number of channel(s) (eg. 2 for stereo) and the size of a sample (eg.
80 #define ALSA_DEFAULT_PERIOD_SIZE 1024
81 #define ALSA_DEFAULT_BUFFER_SIZE ( ALSA_DEFAULT_PERIOD_SIZE << 8 )
82 #define ALSA_SPDIF_PERIOD_SIZE A52_FRAME_NB
83 #define ALSA_SPDIF_BUFFER_SIZE ( ALSA_SPDIF_PERIOD_SIZE << 4 )
84 /* Why << 4 ? --Meuuh */
85 /* Why not ? --Bozo */
88 #define DEFAULT_ALSA_DEVICE N_("default")
90 /*****************************************************************************
92 *****************************************************************************/
93 static int Open ( vlc_object_t * );
94 static void Close ( vlc_object_t * );
95 static void Play ( aout_instance_t * );
96 static void* ALSAThread ( void * );
97 static void ALSAFill ( aout_instance_t * );
98 static int FindDevicesCallback( vlc_object_t *p_this, char const *psz_name,
99 vlc_value_t newval, vlc_value_t oldval, void *p_unused );
100 static void GetDevicesForCard( vlc_object_t *, module_config_t *, int card );
101 static void GetDevices( vlc_object_t *, module_config_t * );
103 /*****************************************************************************
105 *****************************************************************************/
106 static const char *const ppsz_devices[] = { "default" };
107 static const char *const ppsz_devices_text[] = { N_("Default") };
109 set_shortname( "ALSA" )
110 set_description( N_("ALSA audio output") )
111 set_category( CAT_AUDIO )
112 set_subcategory( SUBCAT_AUDIO_AOUT )
113 add_string( "alsa-audio-device", DEFAULT_ALSA_DEVICE, aout_FindAndRestart,
114 N_("ALSA Device Name"), NULL, false )
115 add_deprecated_alias( "alsadev" ) /* deprecated since 0.9.3 */
116 change_string_list( ppsz_devices, ppsz_devices_text, FindDevicesCallback )
117 change_action_add( FindDevicesCallback, N_("Refresh list") )
119 set_capability( "audio output", 150 )
120 set_callbacks( Open, Close )
123 /*****************************************************************************
124 * Probe: probe the audio device for available formats and channels
125 *****************************************************************************/
126 static int Probe( aout_instance_t * p_aout,
127 const char * psz_device, const char * psz_iec_device,
128 int *pi_snd_pcm_format )
130 struct aout_sys_t * p_sys = p_aout->output.p_sys;
131 vlc_value_t val, text;
134 var_Create ( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
135 text.psz_string = _("Audio Device");
136 var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
138 /* We'll open the audio device in non blocking mode so we can just exit
139 * when it is already in use, but for the real stuff we'll still use
140 * the blocking mode */
142 /* Now test linear PCM capabilities */
143 i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_device,
144 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
148 snd_pcm_hw_params_t * p_hw;
149 snd_pcm_hw_params_alloca (&p_hw);
151 if ( snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) < 0 )
153 msg_Warn( p_aout, "unable to retrieve initial hardware parameters"
154 ", disabling linear PCM audio" );
155 snd_pcm_close( p_sys->p_snd_pcm );
156 var_Destroy( p_aout, "audio-device" );
160 if ( snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
161 *pi_snd_pcm_format ) < 0 )
165 if( *pi_snd_pcm_format != SND_PCM_FORMAT_S16 )
167 *pi_snd_pcm_format = SND_PCM_FORMAT_S16;
168 i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm,
169 p_hw, *pi_snd_pcm_format );
173 msg_Warn( p_aout, "unable to set stream sample size and "
174 "word order, disabling linear PCM audio" );
175 snd_pcm_close( p_sys->p_snd_pcm );
176 var_Destroy( p_aout, "audio-device" );
181 i_channels = aout_FormatNbChannels( &p_aout->output.output );
183 while ( i_channels > 0 )
185 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw,
188 switch ( i_channels )
191 val.i_int = AOUT_VAR_MONO;
192 text.psz_string = _("Mono");
193 var_Change( p_aout, "audio-device",
194 VLC_VAR_ADDCHOICE, &val, &text );
197 val.i_int = AOUT_VAR_STEREO;
198 text.psz_string = _("Stereo");
199 var_Change( p_aout, "audio-device",
200 VLC_VAR_ADDCHOICE, &val, &text );
201 var_Set( p_aout, "audio-device", val );
204 val.i_int = AOUT_VAR_2F2R;
205 text.psz_string = _("2 Front 2 Rear");
206 var_Change( p_aout, "audio-device",
207 VLC_VAR_ADDCHOICE, &val, &text );
210 val.i_int = AOUT_VAR_5_1;
211 text.psz_string = (char *)"5.1";
212 var_Change( p_aout, "audio-device",
213 VLC_VAR_ADDCHOICE, &val, &text );
221 /* Special case for mono on stereo only boards */
222 i_channels = aout_FormatNbChannels( &p_aout->output.output );
223 var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
224 if( val.i_int <= 0 && i_channels == 1 )
226 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw, 2 ))
228 val.i_int = AOUT_VAR_STEREO;
229 text.psz_string = (char*)N_("Stereo");
230 var_Change( p_aout, "audio-device",
231 VLC_VAR_ADDCHOICE, &val, &text );
232 var_Set( p_aout, "audio-device", val );
236 /* Close the previously opened device */
237 snd_pcm_close( p_sys->p_snd_pcm );
239 else if ( i_ret == -EBUSY )
241 msg_Warn( p_aout, "audio device: %s is already in use", psz_device );
244 /* Test for S/PDIF device if needed */
245 if ( psz_iec_device )
247 /* Opening the device should be enough */
248 i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_iec_device,
249 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
252 val.i_int = AOUT_VAR_SPDIF;
253 text.psz_string = (char*)N_("A/52 over S/PDIF");
254 var_Change( p_aout, "audio-device",
255 VLC_VAR_ADDCHOICE, &val, &text );
256 if( var_InheritBool( p_aout, "spdif" ) )
257 var_Set( p_aout, "audio-device", val );
259 snd_pcm_close( p_sys->p_snd_pcm );
261 else if ( i_ret == -EBUSY )
263 msg_Warn( p_aout, "audio device: %s is already in use",
268 var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
269 #if (SND_LIB_VERSION <= 0x010015)
270 # warning Please update alsa-lib to version > 1.0.21a.
271 var_Create( p_aout->p_libvlc, "alsa-working", VLC_VAR_BOOL );
274 if( var_GetBool( p_aout->p_libvlc, "alsa-working" ) )
275 dialog_Fatal( p_aout, "ALSA version problem",
276 "VLC failed to re-initialize your sound output device.\n"
277 "Please update alsa-lib to version 1.0.22 or higher "
278 "to fix this issue." );
281 var_SetBool( p_aout->p_libvlc, "alsa-working", true );
285 /* Probe() has failed. */
286 #if (SND_LIB_VERSION <= 0x010017)
287 # warning Please update alsa-lib to version > 1.0.23.
288 var_Create( p_aout->p_libvlc, "alsa-broken", VLC_VAR_BOOL );
289 if( !var_GetBool( p_aout->p_libvlc, "alsa-broken" ) )
291 var_SetBool( p_aout->p_libvlc, "alsa-broken", true );
292 dialog_Fatal( p_aout, "Potential ALSA version problem",
293 "VLC failed to initialize your sound output device (if any).\n"
294 "Please update alsa-lib to version 1.0.24 or higher "
295 "to try to fix this issue." );
298 msg_Dbg( p_aout, "failed to find a usable ALSA configuration" );
299 var_Destroy( p_aout, "audio-device" );
300 GetDevices( VLC_OBJECT(p_aout), NULL );
304 /* Add final settings to the variable */
305 var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
306 var_SetBool( p_aout, "intf-change", true );
310 /*****************************************************************************
311 * Open: create a handle and open an alsa device
312 *****************************************************************************
313 * This function opens an alsa device, through the alsa API.
315 * Note: the only heap-allocated string is psz_device. All the other pointers
316 * are references to psz_device or to stack-allocated data.
317 *****************************************************************************/
318 static int Open( vlc_object_t *p_this )
320 aout_instance_t * p_aout = (aout_instance_t *)p_this;
322 /* Allocate structures */
323 aout_sys_t * p_sys = malloc( sizeof( aout_sys_t ) );
326 p_aout->output.p_sys = p_sys;
328 /* Get device name */
329 char *psz_device = var_InheritString( p_aout, "alsa-audio-device" );
330 if( unlikely(psz_device == NULL) )
332 psz_device = strdup( DEFAULT_ALSA_DEVICE );
333 if( unlikely(psz_device == NULL) )
340 /* Choose the IEC device for S/PDIF output:
341 if the device is overriden by the user then it will be the one
342 otherwise we compute the default device based on the output format. */
343 char *psz_iec_device = NULL;
344 if( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
346 if( !strcmp( psz_device, DEFAULT_ALSA_DEVICE ) )
350 switch( p_aout->output.output.i_rate )
353 aes3 = IEC958_AES3_CON_FS_48000;
356 aes3 = IEC958_AES3_CON_FS_44100;
359 aes3 = IEC958_AES3_CON_FS_32000;
363 if( asprintf( &psz_iec_device,
364 "iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x",
365 IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO,
366 IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER,
375 psz_iec_device = strdup( psz_device );
378 /* Choose the linear PCM format (read the comment above about FPU
380 int i_snd_pcm_format; /* Audio format for ALSA's data */
382 i_snd_pcm_format = SND_PCM_FORMAT_FLOAT;
384 i_snd_pcm_format = SND_PCM_FORMAT_S16;
386 /* If the variable doesn't exist then it's the first time we're called
387 and we have to probe the available audio formats and channels */
388 if( var_Type( p_aout, "audio-device" ) == 0
389 && Probe( p_aout, psz_device, psz_iec_device, &i_snd_pcm_format ) )
391 free( psz_iec_device );
398 switch( var_GetInteger( p_aout, "audio-device") )
401 p_aout->output.output.i_physical_channels
402 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
403 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
406 psz_device = strdup( "surround51" );
409 p_aout->output.output.i_physical_channels
410 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
411 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
413 psz_device = strdup( "surround40" );
415 case AOUT_VAR_STEREO:
416 p_aout->output.output.i_physical_channels
417 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
420 p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
425 psz_device = psz_iec_device;
426 psz_iec_device = NULL;
429 /* This should not happen ! */
430 msg_Err( p_aout, "cannot find audio-device" );
431 free( psz_iec_device );
438 snd_output_stdio_attach( &p_sys->p_snd_stderr, stderr, 0 );
441 /* Open the device */
442 msg_Dbg( p_aout, "opening ALSA device `%s'", psz_device );
443 for( unsigned i = 10; i; i-- )
445 int val = snd_pcm_open( &p_sys->p_snd_pcm, psz_device,
446 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
448 break; /* success! */
452 msg_Err( p_aout, "cannot open ALSA device `%s' (%s)",
453 psz_device, snd_strerror( val ) );
454 dialog_Fatal( p_aout, _("Audio output failed"),
455 _("VLC could not open the ALSA device \"%s\" (%s)."),
456 psz_device, snd_strerror( val ) );
462 /* Since it seems snd_pcm_close hasn't really released the device at
463 the time it returns, probe if the device is available in loop for 1s.
464 We cannot use blocking mode since the we would wait indefinitely when
465 switching from a dmx device to surround51. */
468 msg_Err( p_aout, "audio device %s is already in use",
470 dialog_Fatal( p_aout, _("Audio output failed"),
471 _("The audio device \"%s\" is already in use."),
477 msleep( CLOCK_FREQ / 10 );
481 /* We want blocking mode */
482 snd_pcm_nonblock( p_sys->p_snd_pcm, 0 );
484 snd_pcm_uframes_t i_buffer_size;
485 snd_pcm_uframes_t i_period_size;
490 i_buffer_size = ALSA_SPDIF_BUFFER_SIZE;
491 i_snd_pcm_format = SND_PCM_FORMAT_S16;
494 p_aout->output.i_nb_samples = i_period_size = ALSA_SPDIF_PERIOD_SIZE;
495 p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
496 p_aout->output.output.i_frame_length = A52_FRAME_NB;
498 aout_VolumeNoneInit( p_aout );
502 i_buffer_size = ALSA_DEFAULT_BUFFER_SIZE;
503 i_channels = aout_FormatNbChannels( &p_aout->output.output );
505 p_aout->output.i_nb_samples = i_period_size = ALSA_DEFAULT_PERIOD_SIZE;
507 aout_VolumeSoftInit( p_aout );
510 p_aout->output.pf_play = Play;
512 snd_pcm_hw_params_t *p_hw;
513 snd_pcm_sw_params_t *p_sw;
515 snd_pcm_hw_params_alloca(&p_hw);
516 snd_pcm_sw_params_alloca(&p_sw);
518 /* Due to some bugs in alsa with some drivers, we need to retry in s16l
519 if snd_pcm_hw_params fails in fl32 */
522 /* Get Initial hardware parameters */
523 val = snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw );
526 msg_Err( p_aout, "unable to retrieve hardware parameters (%s)",
527 snd_strerror( val ) );
532 val = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
536 if( i_snd_pcm_format != SND_PCM_FORMAT_S16 )
538 i_snd_pcm_format = SND_PCM_FORMAT_S16;
539 val = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm,
540 p_hw, i_snd_pcm_format );
544 msg_Err( p_aout, "unable to set stream sample size and "
545 "word order (%s)", snd_strerror( val ) );
550 vlc_fourcc_t i_vlc_pcm_format;
552 i_vlc_pcm_format = VLC_CODEC_SPDIFL;
554 switch( i_snd_pcm_format )
556 case SND_PCM_FORMAT_FLOAT:
557 i_vlc_pcm_format = VLC_CODEC_FL32;
559 case SND_PCM_FORMAT_S16:
560 i_vlc_pcm_format = VLC_CODEC_S16N;
565 p_aout->output.output.i_format = i_vlc_pcm_format;
567 val = snd_pcm_hw_params_set_access( p_sys->p_snd_pcm, p_hw,
568 SND_PCM_ACCESS_RW_INTERLEAVED );
571 msg_Err( p_aout, "unable to set interleaved stream format (%s)",
572 snd_strerror( val ) );
577 val = snd_pcm_hw_params_set_channels( p_sys->p_snd_pcm, p_hw, i_channels );
580 msg_Err( p_aout, "unable to set number of output channels (%s)",
581 snd_strerror( val ) );
586 unsigned i_old_rate = p_aout->output.output.i_rate;
587 val = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
588 &p_aout->output.output.i_rate,
590 if( val < 0 || p_aout->output.output.i_rate != i_old_rate )
592 msg_Warn( p_aout, "The rate %d Hz is not supported by your " \
593 "hardware. Using %d Hz instead.\n", i_old_rate, \
594 p_aout->output.output.i_rate );
597 /* Set period size. */
598 val = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm, p_hw,
599 &i_period_size, NULL );
602 msg_Err( p_aout, "unable to set period size (%s)",
603 snd_strerror( val ) );
606 p_aout->output.i_nb_samples = i_period_size;
608 /* Set buffer size. */
609 val = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm, p_hw,
613 msg_Err( p_aout, "unable to set buffer size (%s)",
614 snd_strerror( val ) );
618 /* Commit hardware parameters. */
619 val = snd_pcm_hw_params( p_sys->p_snd_pcm, p_hw );
622 if( i_snd_pcm_format == SND_PCM_FORMAT_FLOAT )
624 i_snd_pcm_format = SND_PCM_FORMAT_S16;
625 p_aout->output.output.i_format = VLC_CODEC_S16N;
626 msg_Warn( p_aout, "unable to commit hardware configuration "
627 "with fl32 samples (%s). Retrying with s16l.",
628 snd_strerror( val ) );
631 msg_Err( p_aout, "unable to commit hardware configuration (%s)",
632 snd_strerror( val ) );
636 val = snd_pcm_hw_params_get_period_time( p_hw, &p_sys->i_period_time,
640 msg_Err( p_aout, "unable to get period time (%s)",
641 snd_strerror( val ) );
645 /* Get Initial software parameters */
646 snd_pcm_sw_params_current( p_sys->p_snd_pcm, p_sw );
648 snd_pcm_sw_params_set_sleep_min( p_sys->p_snd_pcm, p_sw, 0 );
650 snd_pcm_sw_params_set_avail_min( p_sys->p_snd_pcm, p_sw,
651 p_aout->output.i_nb_samples );
652 /* start playing when one period has been written */
653 val = snd_pcm_sw_params_set_start_threshold( p_sys->p_snd_pcm, p_sw,
654 ALSA_DEFAULT_PERIOD_SIZE);
657 msg_Err( p_aout, "unable to set start threshold (%s)",
658 snd_strerror( val ) );
662 /* Commit software parameters. */
663 if ( snd_pcm_sw_params( p_sys->p_snd_pcm, p_sw ) < 0 )
665 msg_Err( p_aout, "unable to set software configuration" );
670 snd_output_printf( p_sys->p_snd_stderr, "\nALSA hardware setup:\n\n" );
671 snd_pcm_dump_hw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
672 snd_output_printf( p_sys->p_snd_stderr, "\nALSA software setup:\n\n" );
673 snd_pcm_dump_sw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
674 snd_output_printf( p_sys->p_snd_stderr, "\n" );
677 p_sys->start_date = 0;
678 vlc_sem_init( &p_sys->wait, 0 );
680 /* Create ALSA thread and wait for its readiness. */
681 if( vlc_clone( &p_sys->thread, ALSAThread, p_aout,
682 VLC_THREAD_PRIORITY_OUTPUT ) )
684 msg_Err( p_aout, "cannot create ALSA thread (%m)" );
685 vlc_sem_destroy( &p_sys->wait );
692 snd_pcm_close( p_sys->p_snd_pcm );
694 snd_output_close( p_sys->p_snd_stderr );
700 static void PlayIgnore( aout_instance_t *p_aout )
701 { /* Already playing - nothing to do */
705 /*****************************************************************************
706 * Play: start playback
707 *****************************************************************************/
708 static void Play( aout_instance_t *p_aout )
710 p_aout->output.pf_play = PlayIgnore;
712 /* get the playing date of the first aout buffer */
713 p_aout->output.p_sys->start_date =
714 aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
716 /* wake up the audio output thread */
717 sem_post( &p_aout->output.p_sys->wait );
720 /*****************************************************************************
721 * Close: close the ALSA device
722 *****************************************************************************/
723 static void Close( vlc_object_t *p_this )
725 aout_instance_t *p_aout = (aout_instance_t *)p_this;
726 struct aout_sys_t * p_sys = p_aout->output.p_sys;
728 /* Make sure that the thread will stop once it is waken up */
729 vlc_cancel( p_sys->thread );
730 vlc_join( p_sys->thread, NULL );
731 vlc_sem_destroy( &p_sys->wait );
733 snd_pcm_close( p_sys->p_snd_pcm );
735 snd_output_close( p_sys->p_snd_stderr );
740 static void pcm_drop(void *pcm)
745 /*****************************************************************************
746 * ALSAThread: asynchronous thread used to DMA the data to the device
747 *****************************************************************************/
748 static void* ALSAThread( void *data )
750 aout_instance_t * p_aout = data;
751 struct aout_sys_t * p_sys = p_aout->output.p_sys;
753 /* Wait for the exact time to start playing (avoids resampling) */
754 vlc_sem_wait( &p_sys->wait );
755 mwait( p_sys->start_date - AOUT_PTS_TOLERANCE / 4 );
757 vlc_cleanup_push( pcm_drop, p_sys->p_snd_pcm );
765 /*****************************************************************************
766 * ALSAFill: function used to fill the ALSA buffer as much as possible
767 *****************************************************************************/
768 static void ALSAFill( aout_instance_t * p_aout )
770 struct aout_sys_t * p_sys = p_aout->output.p_sys;
771 snd_pcm_t *p_pcm = p_sys->p_snd_pcm;
772 snd_pcm_status_t * p_status;
776 int canc = vlc_savecancel();
777 /* Fill in the buffer until space or audio output buffer shortage */
780 snd_pcm_status_alloca(&p_status);
781 i_snd_rc = snd_pcm_status( p_pcm, p_status );
784 msg_Err( p_aout, "cannot get device status" );
788 /* Handle buffer underruns and get the status again */
789 if( snd_pcm_status_get_state( p_status ) == SND_PCM_STATE_XRUN )
791 /* Prepare the device */
792 i_snd_rc = snd_pcm_prepare( p_pcm );
795 msg_Err( p_aout, "cannot recover from buffer underrun" );
799 msg_Dbg( p_aout, "recovered from buffer underrun" );
801 /* Get the new status */
802 i_snd_rc = snd_pcm_status( p_pcm, p_status );
805 msg_Err( p_aout, "cannot get device status after recovery" );
809 /* Underrun, try to recover as quickly as possible */
814 /* Here the device should be in RUNNING state, p_status is valid. */
815 snd_pcm_sframes_t delay = snd_pcm_status_get_delay( p_status );
816 if( delay == 0 ) /* workaround buggy alsa drivers */
817 if( snd_pcm_delay( p_pcm, &delay ) < 0 )
818 delay = 0; /* FIXME: use a positive minimal delay */
820 size_t i_bytes = snd_pcm_frames_to_bytes( p_pcm, delay );
821 mtime_t delay_us = CLOCK_FREQ * i_bytes
822 / p_aout->output.output.i_bytes_per_frame
823 / p_aout->output.output.i_rate
824 * p_aout->output.output.i_frame_length;
827 snd_pcm_state_t state = snd_pcm_status_get_state( p_status );
828 if( state != SND_PCM_STATE_RUNNING )
829 msg_Err( p_aout, "pcm status (%d) != RUNNING", state );
831 msg_Dbg( p_aout, "Delay is %ld frames (%zu bytes)", delay, i_bytes );
833 msg_Dbg( p_aout, "Bytes per frame: %d", p_aout->output.output.i_bytes_per_frame );
834 msg_Dbg( p_aout, "Rate: %d", p_aout->output.output.i_rate );
835 msg_Dbg( p_aout, "Frame length: %d", p_aout->output.output.i_frame_length );
836 msg_Dbg( p_aout, "Next date: in %"PRId64" microseconds", delay_us );
838 next_date = mdate() + delay_us;
841 block_t *p_buffer = aout_OutputNextBuffer( p_aout, next_date,
842 (p_aout->output.output.i_format == VLC_CODEC_SPDIFL) );
844 /* Audio output buffer shortage -> stop the fill process and wait */
845 if( p_buffer == NULL )
848 block_cleanup_push( p_buffer );
851 int n = snd_pcm_poll_descriptors_count(p_pcm);
852 struct pollfd ufd[n];
853 unsigned short revents;
855 snd_pcm_poll_descriptors(p_pcm, ufd, n);
858 vlc_restorecancel(canc);
860 canc = vlc_savecancel();
861 snd_pcm_poll_descriptors_revents(p_pcm, ufd, n, &revents);
865 if(revents & POLLOUT)
867 i_snd_rc = snd_pcm_writei( p_pcm, p_buffer->p_buffer,
868 p_buffer->i_nb_samples );
869 if( i_snd_rc != -ESTRPIPE )
873 /* a suspend event occurred
874 * (stream is suspended and waiting for an application recovery) */
875 msg_Dbg( p_aout, "entering in suspend mode, trying to resume..." );
877 while( ( i_snd_rc = snd_pcm_resume( p_pcm ) ) == -EAGAIN )
879 vlc_restorecancel(canc);
880 msleep(CLOCK_FREQ); /* device still suspended, wait... */
881 canc = vlc_savecancel();
885 /* Device does not support resuming, restart it */
886 i_snd_rc = snd_pcm_prepare( p_pcm );
891 msg_Err( p_aout, "cannot write: %s", snd_strerror( i_snd_rc ) );
893 vlc_restorecancel(canc);
899 msg_Err( p_aout, "ALSA error: %s", snd_strerror( i_snd_rc ) );
901 vlc_restorecancel(canc);
902 msleep(p_sys->i_period_time / 2);
905 /*****************************************************************************
906 * config variable callback
907 *****************************************************************************/
908 static int FindDevicesCallback( vlc_object_t *p_this, char const *psz_name,
909 vlc_value_t newval, vlc_value_t oldval, void *p_unused )
911 module_config_t *p_item;
916 p_item = config_FindConfig( p_this, psz_name );
917 if( !p_item ) return VLC_SUCCESS;
919 /* Clear-up the current list */
924 /* Keep the first entrie */
925 for( i = 1; i < p_item->i_list; i++ )
927 free( (char *)p_item->ppsz_list[i] );
928 free( (char *)p_item->ppsz_list_text[i] );
930 /* TODO: Remove when no more needed */
931 p_item->ppsz_list[i] = NULL;
932 p_item->ppsz_list_text[i] = NULL;
936 GetDevices( p_this, p_item );
938 /* Signal change to the interface */
939 p_item->b_dirty = true;
945 static void GetDevicesForCard( vlc_object_t *obj, module_config_t *p_item,
948 int i_pcm_device = -1;
950 snd_pcm_info_t *p_pcm_info;
952 char psz_dev[4 + 3 * sizeof(int)];
955 snprintf( psz_dev, sizeof (psz_dev), "hw:%u", i_card );
957 if( ( i_err = snd_ctl_open( &p_ctl, psz_dev, 0 ) ) < 0 )
960 if( ( i_err = snd_card_get_name( i_card, &psz_card_name ) ) != 0)
961 psz_card_name = _("Unknown soundcard");
963 snd_pcm_info_alloca( &p_pcm_info );
967 char *psz_device, *psz_descr;
968 if( ( i_err = snd_ctl_pcm_next_device( p_ctl, &i_pcm_device ) ) < 0 )
970 if( i_pcm_device < 0 )
973 snd_pcm_info_set_device( p_pcm_info, i_pcm_device );
974 snd_pcm_info_set_subdevice( p_pcm_info, 0 );
975 snd_pcm_info_set_stream( p_pcm_info, SND_PCM_STREAM_PLAYBACK );
977 if( ( i_err = snd_ctl_pcm_info( p_ctl, p_pcm_info ) ) < 0 )
979 if( i_err != -ENOENT )
980 msg_Err( obj, "cannot get PCM device %d:%d infos: %s", i_card,
981 i_pcm_device, snd_strerror( -i_err ) );
985 if( asprintf( &psz_device, "plughw:%u,%u", i_card, i_pcm_device ) == -1 )
987 if( asprintf( &psz_descr, "%s: %s (%s)", psz_card_name,
988 snd_pcm_info_get_name(p_pcm_info), psz_device ) == -1 )
994 msg_Dbg( obj, " %s", psz_descr );
998 p_item->ppsz_list = xrealloc( p_item->ppsz_list,
999 (p_item->i_list + 2) * sizeof(char *) );
1000 p_item->ppsz_list_text = xrealloc( p_item->ppsz_list_text,
1001 (p_item->i_list + 2) * sizeof(char *) );
1002 p_item->ppsz_list[ p_item->i_list ] = psz_device;
1003 p_item->ppsz_list_text[ p_item->i_list ] = psz_descr;
1005 p_item->ppsz_list[ p_item->i_list ] = NULL;
1006 p_item->ppsz_list_text[ p_item->i_list ] = NULL;
1015 snd_ctl_close( p_ctl );
1019 static void GetDevices( vlc_object_t *obj, module_config_t *p_item )
1024 msg_Dbg( obj, "Available alsa output devices:" );
1025 while( (i_err = snd_card_next( &i_card )) == 0 && i_card > -1 )
1026 GetDevicesForCard( obj, p_item, i_card );
1029 msg_Err( obj, "cannot enumerate cards: %s", snd_strerror( -i_err ) );