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 "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 GetDevices( vlc_object_t *, module_config_t * );
102 /*****************************************************************************
104 *****************************************************************************/
105 static const char *const ppsz_devices[] = { "default" };
106 static const char *const ppsz_devices_text[] = { N_("Default") };
108 set_shortname( "ALSA" )
109 set_description( N_("ALSA audio output") )
110 set_category( CAT_AUDIO )
111 set_subcategory( SUBCAT_AUDIO_AOUT )
112 add_string( "alsa-audio-device", DEFAULT_ALSA_DEVICE,
113 N_("ALSA Device Name"), NULL, false )
114 add_deprecated_alias( "alsadev" ) /* deprecated since 0.9.3 */
115 change_string_list( ppsz_devices, ppsz_devices_text, FindDevicesCallback )
116 change_action_add( FindDevicesCallback, N_("Refresh list") )
118 set_capability( "audio output", 150 )
119 set_callbacks( Open, Close )
122 /*****************************************************************************
123 * Probe: probe the audio device for available formats and channels
124 *****************************************************************************/
125 static void Probe (aout_instance_t *p_aout,
126 const char *psz_device, const char *psz_iec_device,
127 int *pi_snd_pcm_format)
129 struct aout_sys_t * p_sys = p_aout->output.p_sys;
130 vlc_value_t val, text;
133 var_Create ( p_aout, "audio-device", VLC_VAR_INTEGER | VLC_VAR_HASCHOICE );
134 text.psz_string = _("Audio Device");
135 var_Change( p_aout, "audio-device", VLC_VAR_SETTEXT, &text, NULL );
137 /* We'll open the audio device in non blocking mode so we can just exit
138 * when it is already in use, but for the real stuff we'll still use
139 * the blocking mode */
141 /* Now test linear PCM capabilities */
142 i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_device,
143 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
147 snd_pcm_hw_params_t * p_hw;
148 snd_pcm_hw_params_alloca (&p_hw);
150 if ( snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw ) < 0 )
152 msg_Warn( p_aout, "unable to retrieve initial hardware parameters"
153 ", disabling linear PCM audio" );
154 snd_pcm_close( p_sys->p_snd_pcm );
158 if ( snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
159 *pi_snd_pcm_format ) < 0 )
163 if( *pi_snd_pcm_format != SND_PCM_FORMAT_S16 )
165 *pi_snd_pcm_format = SND_PCM_FORMAT_S16;
166 i_snd_rc = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm,
167 p_hw, *pi_snd_pcm_format );
171 msg_Warn( p_aout, "unable to set stream sample size and "
172 "word order, disabling linear PCM audio" );
173 snd_pcm_close( p_sys->p_snd_pcm );
178 i_channels = aout_FormatNbChannels( &p_aout->output.output );
180 while ( i_channels > 0 )
182 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw,
185 switch ( i_channels )
188 val.i_int = AOUT_VAR_MONO;
189 text.psz_string = _("Mono");
190 var_Change( p_aout, "audio-device",
191 VLC_VAR_ADDCHOICE, &val, &text );
194 val.i_int = AOUT_VAR_STEREO;
195 text.psz_string = _("Stereo");
196 var_Change( p_aout, "audio-device",
197 VLC_VAR_ADDCHOICE, &val, &text );
198 var_Set( p_aout, "audio-device", val );
201 val.i_int = AOUT_VAR_2F2R;
202 text.psz_string = _("2 Front 2 Rear");
203 var_Change( p_aout, "audio-device",
204 VLC_VAR_ADDCHOICE, &val, &text );
207 val.i_int = AOUT_VAR_5_1;
208 text.psz_string = (char *)"5.1";
209 var_Change( p_aout, "audio-device",
210 VLC_VAR_ADDCHOICE, &val, &text );
218 /* Special case for mono on stereo only boards */
219 i_channels = aout_FormatNbChannels( &p_aout->output.output );
220 var_Change( p_aout, "audio-device", VLC_VAR_CHOICESCOUNT, &val, NULL );
221 if( val.i_int <= 0 && i_channels == 1 )
223 if ( !snd_pcm_hw_params_test_channels( p_sys->p_snd_pcm, p_hw, 2 ))
225 val.i_int = AOUT_VAR_STEREO;
226 text.psz_string = (char*)N_("Stereo");
227 var_Change( p_aout, "audio-device",
228 VLC_VAR_ADDCHOICE, &val, &text );
229 var_Set( p_aout, "audio-device", val );
233 /* Close the previously opened device */
234 snd_pcm_close( p_sys->p_snd_pcm );
236 else if ( i_ret == -EBUSY )
238 msg_Warn( p_aout, "audio device: %s is already in use", psz_device );
241 /* Test for S/PDIF device if needed */
242 if ( psz_iec_device )
244 /* Opening the device should be enough */
245 i_ret = snd_pcm_open( &p_sys->p_snd_pcm, psz_iec_device,
246 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK );
249 val.i_int = AOUT_VAR_SPDIF;
250 text.psz_string = (char*)N_("A/52 over S/PDIF");
251 var_Change( p_aout, "audio-device",
252 VLC_VAR_ADDCHOICE, &val, &text );
253 if( var_InheritBool( p_aout, "spdif" ) )
254 var_Set( p_aout, "audio-device", val );
256 snd_pcm_close( p_sys->p_snd_pcm );
258 else if ( i_ret == -EBUSY )
260 msg_Warn( p_aout, "audio device: %s is already in use",
265 /* Add final settings to the variable */
266 var_AddCallback( p_aout, "audio-device", aout_ChannelsRestart, NULL );
267 var_TriggerCallback( p_aout, "intf-change" );
270 /*****************************************************************************
271 * Open: create a handle and open an alsa device
272 *****************************************************************************
273 * This function opens an alsa device, through the alsa API.
275 * Note: the only heap-allocated string is psz_device. All the other pointers
276 * are references to psz_device or to stack-allocated data.
277 *****************************************************************************/
278 static int Open( vlc_object_t *p_this )
280 aout_instance_t * p_aout = (aout_instance_t *)p_this;
282 /* Allocate structures */
283 aout_sys_t * p_sys = malloc( sizeof( aout_sys_t ) );
286 p_aout->output.p_sys = p_sys;
288 /* Get device name */
289 char *psz_device = var_InheritString( p_aout, "alsa-audio-device" );
290 if( unlikely(psz_device == NULL) )
296 /* Choose the IEC device for S/PDIF output:
297 if the device is overridden by the user then it will be the one
298 otherwise we compute the default device based on the output format. */
299 char *psz_iec_device = NULL;
300 if( AOUT_FMT_NON_LINEAR( &p_aout->output.output ) )
302 if( !strcmp( psz_device, DEFAULT_ALSA_DEVICE ) )
306 switch( p_aout->output.output.i_rate )
309 aes3 = IEC958_AES3_CON_FS_48000;
312 aes3 = IEC958_AES3_CON_FS_44100;
315 aes3 = IEC958_AES3_CON_FS_32000;
319 if( asprintf( &psz_iec_device,
320 "iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x",
321 IEC958_AES0_CON_EMPHASIS_NONE | IEC958_AES0_NONAUDIO,
322 IEC958_AES1_CON_ORIGINAL | IEC958_AES1_CON_PCM_CODER,
331 psz_iec_device = strdup( psz_device );
334 /* Choose the linear PCM format (read the comment above about FPU
336 int i_snd_pcm_format; /* Audio format for ALSA's data */
338 i_snd_pcm_format = SND_PCM_FORMAT_FLOAT;
340 i_snd_pcm_format = SND_PCM_FORMAT_S16;
342 /* If the variable doesn't exist then it's the first time we're called
343 and we have to probe the available audio formats and channels */
344 if (var_Type (p_aout, "audio-device") == 0)
345 Probe (p_aout, psz_device, psz_iec_device, &i_snd_pcm_format);
348 switch( var_GetInteger( p_aout, "audio-device") )
351 p_aout->output.output.i_physical_channels
352 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
353 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
356 psz_device = strdup( "surround51" );
359 p_aout->output.output.i_physical_channels
360 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
361 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
363 psz_device = strdup( "surround40" );
365 case AOUT_VAR_STEREO:
366 p_aout->output.output.i_physical_channels
367 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
370 p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
375 psz_device = psz_iec_device;
376 psz_iec_device = NULL;
379 msg_Warn( p_aout, "cannot find audio-device" );
383 snd_output_stdio_attach( &p_sys->p_snd_stderr, stderr, 0 );
386 /* Open the device */
387 msg_Dbg( p_aout, "opening ALSA device `%s'", psz_device );
388 int val = snd_pcm_open (&p_sys->p_snd_pcm, psz_device,
389 SND_PCM_STREAM_PLAYBACK, 0);
390 #if (SND_LIB_VERSION <= 0x010015)
391 # warning Please update alsa-lib to version > 1.0.21a.
392 var_Create (p_aout->p_libvlc, "alsa-working", VLC_VAR_BOOL);
393 if (val != 0 && var_GetBool (p_aout->p_libvlc, "alsa-working"))
394 dialog_Fatal (p_aout, "ALSA version problem",
395 "VLC failed to re-initialize your audio output device.\n"
396 "Please update alsa-lib to version 1.0.22 or higher "
397 "to fix this issue.");
398 var_SetBool (p_aout->p_libvlc, "alsa-working", !val);
402 #if (SND_LIB_VERSION <= 0x010017)
403 # warning Please update alsa-lib to version > 1.0.23.
404 var_Create (p_aout->p_libvlc, "alsa-broken", VLC_VAR_BOOL);
405 if (!var_GetBool (p_aout->p_libvlc, "alsa-broken"))
407 var_SetBool (p_aout->p_libvlc, "alsa-broken", true);
408 dialog_Fatal (p_aout, "Potential ALSA version problem",
409 "VLC failed to initialize your audio output device (if any).\n"
410 "Please update alsa-lib to version 1.0.24 or higher "
411 "to try to fix this issue.");
414 msg_Err (p_aout, "cannot open ALSA device `%s' (%s)",
415 psz_device, snd_strerror (val));
416 dialog_Fatal (p_aout, _("Audio output failed"),
417 _("The audio device \"%s\" could not be used:\n%s."),
418 psz_device, snd_strerror (val));
425 snd_pcm_uframes_t i_buffer_size;
426 snd_pcm_uframes_t i_period_size;
431 i_buffer_size = ALSA_SPDIF_BUFFER_SIZE;
432 i_snd_pcm_format = SND_PCM_FORMAT_S16;
435 p_aout->output.i_nb_samples = i_period_size = ALSA_SPDIF_PERIOD_SIZE;
436 p_aout->output.output.i_bytes_per_frame = AOUT_SPDIF_SIZE;
437 p_aout->output.output.i_frame_length = A52_FRAME_NB;
439 aout_VolumeNoneInit( p_aout );
443 i_buffer_size = ALSA_DEFAULT_BUFFER_SIZE;
444 i_channels = aout_FormatNbChannels( &p_aout->output.output );
446 p_aout->output.i_nb_samples = i_period_size = ALSA_DEFAULT_PERIOD_SIZE;
448 aout_VolumeSoftInit( p_aout );
451 p_aout->output.pf_play = Play;
453 snd_pcm_hw_params_t *p_hw;
454 snd_pcm_sw_params_t *p_sw;
456 snd_pcm_hw_params_alloca(&p_hw);
457 snd_pcm_sw_params_alloca(&p_sw);
459 /* Due to some bugs in alsa with some drivers, we need to retry in s16l
460 if snd_pcm_hw_params fails in fl32 */
462 /* Get Initial hardware parameters */
463 val = snd_pcm_hw_params_any( p_sys->p_snd_pcm, p_hw );
466 msg_Err( p_aout, "unable to retrieve hardware parameters (%s)",
467 snd_strerror( val ) );
472 val = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm, p_hw,
476 if( i_snd_pcm_format != SND_PCM_FORMAT_S16 )
478 i_snd_pcm_format = SND_PCM_FORMAT_S16;
479 val = snd_pcm_hw_params_set_format( p_sys->p_snd_pcm,
480 p_hw, i_snd_pcm_format );
484 msg_Err( p_aout, "unable to set stream sample size and "
485 "word order (%s)", snd_strerror( val ) );
490 vlc_fourcc_t i_vlc_pcm_format;
492 i_vlc_pcm_format = VLC_CODEC_SPDIFL;
494 switch( i_snd_pcm_format )
496 case SND_PCM_FORMAT_FLOAT:
497 i_vlc_pcm_format = VLC_CODEC_FL32;
499 case SND_PCM_FORMAT_S16:
500 i_vlc_pcm_format = VLC_CODEC_S16N;
505 p_aout->output.output.i_format = i_vlc_pcm_format;
507 val = snd_pcm_hw_params_set_access( p_sys->p_snd_pcm, p_hw,
508 SND_PCM_ACCESS_RW_INTERLEAVED );
511 msg_Err( p_aout, "unable to set interleaved stream format (%s)",
512 snd_strerror( val ) );
517 val = snd_pcm_hw_params_set_channels( p_sys->p_snd_pcm, p_hw, i_channels );
520 msg_Err( p_aout, "unable to set number of output channels (%s)",
521 snd_strerror( val ) );
526 unsigned i_old_rate = p_aout->output.output.i_rate;
527 val = snd_pcm_hw_params_set_rate_near( p_sys->p_snd_pcm, p_hw,
528 &p_aout->output.output.i_rate,
530 if( val < 0 || p_aout->output.output.i_rate != i_old_rate )
532 msg_Warn( p_aout, "The rate %d Hz is not supported by your " \
533 "hardware. Using %d Hz instead.\n", i_old_rate, \
534 p_aout->output.output.i_rate );
537 /* Set period size. */
538 val = snd_pcm_hw_params_set_period_size_near( p_sys->p_snd_pcm, p_hw,
539 &i_period_size, NULL );
542 msg_Err( p_aout, "unable to set period size (%s)",
543 snd_strerror( val ) );
546 p_aout->output.i_nb_samples = i_period_size;
548 /* Set buffer size. */
549 val = snd_pcm_hw_params_set_buffer_size_near( p_sys->p_snd_pcm, p_hw,
553 msg_Err( p_aout, "unable to set buffer size (%s)",
554 snd_strerror( val ) );
558 /* Commit hardware parameters. */
559 val = snd_pcm_hw_params( p_sys->p_snd_pcm, p_hw );
562 if( i_snd_pcm_format == SND_PCM_FORMAT_FLOAT )
564 i_snd_pcm_format = SND_PCM_FORMAT_S16;
565 p_aout->output.output.i_format = VLC_CODEC_S16N;
566 msg_Warn( p_aout, "unable to commit hardware configuration "
567 "with fl32 samples (%s). Retrying with s16l.",
568 snd_strerror( val ) );
571 msg_Err( p_aout, "unable to commit hardware configuration (%s)",
572 snd_strerror( val ) );
576 val = snd_pcm_hw_params_get_period_time( p_hw, &p_sys->i_period_time,
580 msg_Err( p_aout, "unable to get period time (%s)",
581 snd_strerror( val ) );
585 /* Get Initial software parameters */
586 snd_pcm_sw_params_current( p_sys->p_snd_pcm, p_sw );
588 snd_pcm_sw_params_set_avail_min( p_sys->p_snd_pcm, p_sw,
589 p_aout->output.i_nb_samples );
590 /* start playing when one period has been written */
591 val = snd_pcm_sw_params_set_start_threshold( p_sys->p_snd_pcm, p_sw,
592 ALSA_DEFAULT_PERIOD_SIZE);
595 msg_Err( p_aout, "unable to set start threshold (%s)",
596 snd_strerror( val ) );
600 /* Commit software parameters. */
601 if ( snd_pcm_sw_params( p_sys->p_snd_pcm, p_sw ) < 0 )
603 msg_Err( p_aout, "unable to set software configuration" );
608 snd_output_printf( p_sys->p_snd_stderr, "\nALSA hardware setup:\n\n" );
609 snd_pcm_dump_hw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
610 snd_output_printf( p_sys->p_snd_stderr, "\nALSA software setup:\n\n" );
611 snd_pcm_dump_sw_setup( p_sys->p_snd_pcm, p_sys->p_snd_stderr );
612 snd_output_printf( p_sys->p_snd_stderr, "\n" );
615 p_sys->start_date = 0;
616 vlc_sem_init( &p_sys->wait, 0 );
618 /* Create ALSA thread and wait for its readiness. */
619 if( vlc_clone( &p_sys->thread, ALSAThread, p_aout,
620 VLC_THREAD_PRIORITY_OUTPUT ) )
622 msg_Err( p_aout, "cannot create ALSA thread (%m)" );
623 vlc_sem_destroy( &p_sys->wait );
630 snd_pcm_close( p_sys->p_snd_pcm );
632 snd_output_close( p_sys->p_snd_stderr );
638 static void PlayIgnore( aout_instance_t *p_aout )
639 { /* Already playing - nothing to do */
643 /*****************************************************************************
644 * Play: start playback
645 *****************************************************************************/
646 static void Play( aout_instance_t *p_aout )
648 p_aout->output.pf_play = PlayIgnore;
650 /* get the playing date of the first aout buffer */
651 p_aout->output.p_sys->start_date =
652 aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
654 /* wake up the audio output thread */
655 sem_post( &p_aout->output.p_sys->wait );
658 /*****************************************************************************
659 * Close: close the ALSA device
660 *****************************************************************************/
661 static void Close( vlc_object_t *p_this )
663 aout_instance_t *p_aout = (aout_instance_t *)p_this;
664 struct aout_sys_t * p_sys = p_aout->output.p_sys;
666 /* Make sure that the thread will stop once it is waken up */
667 vlc_cancel( p_sys->thread );
668 vlc_join( p_sys->thread, NULL );
669 vlc_sem_destroy( &p_sys->wait );
671 snd_pcm_drop( p_sys->p_snd_pcm );
672 snd_pcm_close( p_sys->p_snd_pcm );
674 snd_output_close( p_sys->p_snd_stderr );
679 /*****************************************************************************
680 * ALSAThread: asynchronous thread used to DMA the data to the device
681 *****************************************************************************/
682 static void* ALSAThread( void *data )
684 aout_instance_t * p_aout = data;
685 struct aout_sys_t * p_sys = p_aout->output.p_sys;
687 /* Wait for the exact time to start playing (avoids resampling) */
688 vlc_sem_wait( &p_sys->wait );
689 mwait( p_sys->start_date - AOUT_PTS_TOLERANCE / 4 );
697 /*****************************************************************************
698 * ALSAFill: function used to fill the ALSA buffer as much as possible
699 *****************************************************************************/
700 static void ALSAFill( aout_instance_t * p_aout )
702 struct aout_sys_t * p_sys = p_aout->output.p_sys;
703 snd_pcm_t *p_pcm = p_sys->p_snd_pcm;
704 snd_pcm_status_t * p_status;
708 int canc = vlc_savecancel();
709 /* Fill in the buffer until space or audio output buffer shortage */
712 snd_pcm_status_alloca(&p_status);
713 i_snd_rc = snd_pcm_status( p_pcm, p_status );
716 msg_Err( p_aout, "cannot get device status" );
720 /* Handle buffer underruns and get the status again */
721 if( snd_pcm_status_get_state( p_status ) == SND_PCM_STATE_XRUN )
723 /* Prepare the device */
724 i_snd_rc = snd_pcm_prepare( p_pcm );
727 msg_Err( p_aout, "cannot recover from buffer underrun" );
731 msg_Dbg( p_aout, "recovered from buffer underrun" );
733 /* Get the new status */
734 i_snd_rc = snd_pcm_status( p_pcm, p_status );
737 msg_Err( p_aout, "cannot get device status after recovery" );
741 /* Underrun, try to recover as quickly as possible */
746 /* Here the device should be in RUNNING state, p_status is valid. */
747 snd_pcm_sframes_t delay = snd_pcm_status_get_delay( p_status );
748 if( delay == 0 ) /* workaround buggy alsa drivers */
749 if( snd_pcm_delay( p_pcm, &delay ) < 0 )
750 delay = 0; /* FIXME: use a positive minimal delay */
752 size_t i_bytes = snd_pcm_frames_to_bytes( p_pcm, delay );
753 mtime_t delay_us = CLOCK_FREQ * i_bytes
754 / p_aout->output.output.i_bytes_per_frame
755 / p_aout->output.output.i_rate
756 * p_aout->output.output.i_frame_length;
759 snd_pcm_state_t state = snd_pcm_status_get_state( p_status );
760 if( state != SND_PCM_STATE_RUNNING )
761 msg_Err( p_aout, "pcm status (%d) != RUNNING", state );
763 msg_Dbg( p_aout, "Delay is %ld frames (%zu bytes)", delay, i_bytes );
765 msg_Dbg( p_aout, "Bytes per frame: %d", p_aout->output.output.i_bytes_per_frame );
766 msg_Dbg( p_aout, "Rate: %d", p_aout->output.output.i_rate );
767 msg_Dbg( p_aout, "Frame length: %d", p_aout->output.output.i_frame_length );
768 msg_Dbg( p_aout, "Next date: in %"PRId64" microseconds", delay_us );
770 next_date = mdate() + delay_us;
773 block_t *p_buffer = aout_OutputNextBuffer( p_aout, next_date,
774 (p_aout->output.output.i_format == VLC_CODEC_SPDIFL) );
776 /* Audio output buffer shortage -> stop the fill process and wait */
777 if( p_buffer == NULL )
780 block_cleanup_push( p_buffer );
783 int n = snd_pcm_poll_descriptors_count(p_pcm);
784 struct pollfd ufd[n];
785 unsigned short revents;
787 snd_pcm_poll_descriptors(p_pcm, ufd, n);
790 vlc_restorecancel(canc);
792 canc = vlc_savecancel();
793 snd_pcm_poll_descriptors_revents(p_pcm, ufd, n, &revents);
797 if(revents & POLLOUT)
799 i_snd_rc = snd_pcm_writei( p_pcm, p_buffer->p_buffer,
800 p_buffer->i_nb_samples );
801 if( i_snd_rc != -ESTRPIPE )
805 /* a suspend event occurred
806 * (stream is suspended and waiting for an application recovery) */
807 msg_Dbg( p_aout, "entering in suspend mode, trying to resume..." );
809 while( ( i_snd_rc = snd_pcm_resume( p_pcm ) ) == -EAGAIN )
811 vlc_restorecancel(canc);
812 msleep(CLOCK_FREQ); /* device still suspended, wait... */
813 canc = vlc_savecancel();
817 /* Device does not support resuming, restart it */
818 i_snd_rc = snd_pcm_prepare( p_pcm );
823 msg_Err( p_aout, "cannot write: %s", snd_strerror( i_snd_rc ) );
825 vlc_restorecancel(canc);
831 msg_Err( p_aout, "ALSA error: %s", snd_strerror( i_snd_rc ) );
833 vlc_restorecancel(canc);
834 msleep(p_sys->i_period_time / 2);
837 /*****************************************************************************
838 * config variable callback
839 *****************************************************************************/
840 static int FindDevicesCallback( vlc_object_t *p_this, char const *psz_name,
841 vlc_value_t newval, vlc_value_t oldval, void *p_unused )
843 module_config_t *p_item;
848 p_item = config_FindConfig( p_this, psz_name );
849 if( !p_item ) return VLC_SUCCESS;
851 /* Clear-up the current list */
856 /* Keep the first entrie */
857 for( i = 1; i < p_item->i_list; i++ )
859 free( (char *)p_item->ppsz_list[i] );
860 free( (char *)p_item->ppsz_list_text[i] );
862 /* TODO: Remove when no more needed */
863 p_item->ppsz_list[i] = NULL;
864 p_item->ppsz_list_text[i] = NULL;
868 GetDevices( p_this, p_item );
870 /* Signal change to the interface */
871 p_item->b_dirty = true;
877 static void GetDevices (vlc_object_t *obj, module_config_t *item)
881 msg_Dbg(obj, "Available ALSA PCM devices:");
883 if (snd_device_name_hint(-1, "pcm", &hints) < 0)
886 for (size_t i = 0; hints[i] != NULL; i++)
888 void *hint = hints[i];
889 char *name = snd_device_name_get_hint(hint, "NAME");
890 if (unlikely(name == NULL))
893 char *desc = snd_device_name_get_hint(hint, "DESC");
895 for (char *lf = strchr(desc, '\n'); lf; lf = strchr(lf, '\n'))
897 msg_Dbg(obj, " %s (%s)", (desc != NULL) ? desc : name, name);
901 item->ppsz_list = xrealloc(item->ppsz_list,
902 (item->i_list + 2) * sizeof(char *));
903 item->ppsz_list_text = xrealloc(item->ppsz_list_text,
904 (item->i_list + 2) * sizeof(char *));
905 item->ppsz_list[item->i_list] = name;
908 item->ppsz_list_text[item->i_list] = desc;
918 snd_device_name_free_hint(hints);
922 item->ppsz_list[item->i_list] = NULL;
923 item->ppsz_list_text[item->i_list] = NULL;