1 /*****************************************************************************
2 * pulse.c : Pulseaudio output plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2008 the VideoLAN team
5 * Copyright (C) 2009-2011 RĂ©mi Denis-Courmont
7 * Authors: Martin Hamrle <hamrle @ post . cz>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
29 #include <vlc_common.h>
30 #include <vlc_plugin.h>
34 #include <pulse/pulseaudio.h>
36 #if !PA_CHECK_VERSION(0,9,22)
37 # include <vlc_xlib.h>
40 static int Open ( vlc_object_t * );
41 static void Close ( vlc_object_t * );
44 set_shortname( "PulseAudio" )
45 set_description( N_("Pulseaudio audio output") )
46 set_capability( "audio output", 160 )
47 set_category( CAT_AUDIO )
48 set_subcategory( SUBCAT_AUDIO_AOUT )
49 add_shortcut( "pulseaudio", "pa" )
50 set_callbacks( Open, Close )
54 * Be careful what you do when the PulseAudio mainloop is held, which is to say
55 * within PulseAudio callbacks, or after pa_threaded_mainloop_lock().
56 * In particular, a VLC variable callback cannot be triggered nor deleted with
57 * the PulseAudio mainloop lock held, if the callback acquires the lock. */
61 pa_stream *stream; /**< PulseAudio playback stream object */
62 pa_context *context; /**< PulseAudio connection context */
63 pa_threaded_mainloop *mainloop; /**< PulseAudio thread */
64 pa_time_event *trigger; /**< Deferred stream trigger */
65 pa_volume_t base_volume; /**< 0dB reference volume */
66 pa_cvolume cvolume; /**< actual sink input volume */
67 mtime_t paused; /**< Time when (last) paused */
68 mtime_t pts; /**< Play time of buffer write offset */
69 mtime_t desync; /**< Measured desynchronization */
70 unsigned rate; /**< Current stream sample rate */
73 static void sink_list_cb(pa_context *, const pa_sink_info *, int, void *);
74 static void sink_input_info_cb(pa_context *, const pa_sink_input_info *,
78 static void context_cb(pa_context *ctx, pa_subscription_event_type_t type,
79 uint32_t idx, void *userdata)
81 audio_output_t *aout = userdata;
82 aout_sys_t *sys = aout->sys;
85 switch (type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK)
87 case PA_SUBSCRIPTION_EVENT_SINK:
88 switch (type & PA_SUBSCRIPTION_EVENT_TYPE_MASK)
90 case PA_SUBSCRIPTION_EVENT_NEW:
91 case PA_SUBSCRIPTION_EVENT_CHANGE:
92 op = pa_context_get_sink_info_by_index(ctx, idx, sink_list_cb, aout);
93 if (likely(op != NULL))
94 pa_operation_unref(op);
97 case PA_SUBSCRIPTION_EVENT_REMOVE:
98 var_Change(aout, "audio-device", VLC_VAR_DELCHOICE,
99 &(vlc_value_t){ .i_int = idx }, NULL);
104 case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
105 if (idx != pa_stream_get_index(sys->stream))
106 break; /* only interested in our sink input */
108 /* Gee... PA will not provide the infos directly in the event. */
109 switch (type & PA_SUBSCRIPTION_EVENT_TYPE_MASK)
111 case PA_SUBSCRIPTION_EVENT_REMOVE:
112 msg_Err(aout, "sink input killed!");
116 op = pa_context_get_sink_input_info(ctx, idx, sink_input_info_cb,
118 if (likely(op != NULL))
119 pa_operation_unref(op);
124 default: /* unsubscribed facility?! */
131 static void sink_list_cb(pa_context *c, const pa_sink_info *i, int eol,
134 audio_output_t *aout = userdata;
135 vlc_value_t val, text;
141 msg_Dbg(aout, "listing sink %s (%"PRIu32"): %s", i->name, i->index,
143 val.i_int = i->index;
144 text.psz_string = (char *)i->description;
145 /* FIXME: There is no way to replace a choice explicitly. */
146 var_Change(aout, "audio-device", VLC_VAR_DELCHOICE, &val, NULL);
147 var_Change(aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text);
148 /* FIXME: var_Change() can change the variable value if we remove the
149 * current value from the choice list, or if we add a choice while there
150 * was none. So force the correct value back. */
151 val.i_int = pa_stream_get_device_index(aout->sys->stream);
152 var_Change(aout, "audio-device", VLC_VAR_SETVALUE, &val, NULL);
155 static void sink_info_cb(pa_context *c, const pa_sink_info *i, int eol,
158 audio_output_t *aout = userdata;
159 aout_sys_t *sys = aout->sys;
165 /* PulseAudio flat volume NORM / 100% / 0dB corresponds to no software
166 * amplification and maximum hardware amplification.
167 * VLC maps DEFAULT / 100% to no gain at all (software/hardware).
168 * Thus we need to use the sink base_volume as a multiplier,
169 * if and only if flat volume is active for our current sink. */
170 if (i->flags & PA_SINK_FLAT_VOLUME)
171 sys->base_volume = i->base_volume;
173 sys->base_volume = PA_VOLUME_NORM;
174 msg_Dbg(aout, "base volume: %"PRIu32, sys->base_volume);
178 /*** Latency management and lip synchronization ***/
179 static void stream_reset_sync(pa_stream *s, audio_output_t *aout)
181 aout_sys_t *sys = aout->sys;
182 const unsigned rate = aout->format.i_rate;
184 sys->pts = VLC_TS_INVALID;
186 pa_operation *op = pa_stream_update_sample_rate(s, rate, NULL, NULL);
187 if (unlikely(op == NULL))
189 pa_operation_unref(op);
193 static void stream_start(pa_stream *s, audio_output_t *aout)
195 aout_sys_t *sys = aout->sys;
198 assert (sys->trigger == NULL);
200 op = pa_stream_cork(s, 0, NULL, NULL);
202 pa_operation_unref(op);
203 op = pa_stream_trigger(s, NULL, NULL);
204 if (likely(op != NULL))
205 pa_operation_unref(op);
208 static void stream_stop(pa_stream *s, audio_output_t *aout)
210 aout_sys_t *sys = aout->sys;
213 if (sys->trigger != NULL) {
214 vlc_pa_rttime_free(sys->mainloop, sys->trigger);
218 op = pa_stream_cork(s, 1, NULL, NULL);
220 pa_operation_unref(op);
223 static void stream_trigger_cb(pa_mainloop_api *api, pa_time_event *e,
224 const struct timeval *tv, void *userdata)
226 audio_output_t *aout = userdata;
227 aout_sys_t *sys = aout->sys;
229 assert (sys->trigger == e);
231 msg_Dbg(aout, "starting deferred");
232 vlc_pa_rttime_free(sys->mainloop, sys->trigger);
234 stream_start(sys->stream, aout);
235 (void) api; (void) e; (void) tv;
239 * Starts or resumes the playback stream.
240 * Tries start playing back audio samples at the most accurate time
241 * in order to minimize desync and resampling during early playback.
242 * @note PulseAudio lock required.
244 static void stream_resync(audio_output_t *aout, pa_stream *s)
246 aout_sys_t *sys = aout->sys;
249 assert (sys->pts != VLC_TS_INVALID);
251 if (sys->trigger != NULL) {
252 vlc_pa_rttime_free(sys->mainloop, sys->trigger);
256 delta = vlc_pa_get_latency(aout, sys->context, s);
257 if (unlikely(delta == VLC_TS_INVALID)) {
258 msg_Dbg(aout, "cannot synchronize start");
259 delta = 0; /* screwed */
262 delta = (sys->pts - mdate()) - delta;
264 msg_Dbg(aout, "deferring start (%"PRId64" us)", delta);
265 delta += pa_rtclock_now();
266 sys->trigger = pa_context_rttime_new(sys->context, delta,
267 stream_trigger_cb, aout);
269 msg_Warn(aout, "starting late (%"PRId64" us)", delta);
270 stream_start(s, aout);
274 static void stream_latency_cb(pa_stream *s, void *userdata)
276 audio_output_t *aout = userdata;
277 aout_sys_t *sys = aout->sys;
278 mtime_t delta, change;
280 if (sys->paused != VLC_TS_INVALID)
281 return; /* nothing to do while paused */
282 if (sys->pts == VLC_TS_INVALID) {
283 msg_Dbg(aout, "missing latency from input");
286 if (pa_stream_is_corked(s) > 0) {
287 stream_resync(aout, s);
291 /* Compute lip desynchronization */
292 delta = vlc_pa_get_latency(aout, sys->context, s);
293 if (delta == VLC_TS_INVALID)
296 delta = (sys->pts - mdate()) - delta;
297 change = delta - sys->desync;
299 //msg_Dbg(aout, "desync: %+"PRId64" us (variation: %+"PRId64" us)",
302 const unsigned inrate = aout->format.i_rate;
303 unsigned outrate = sys->rate;
306 if (delta < -AOUT_MAX_PTS_DELAY)
307 msg_Warn(aout, "too late by %"PRId64" us", -delta);
308 else if (delta > +AOUT_MAX_PTS_ADVANCE)
309 msg_Warn(aout, "too early by %"PRId64" us", delta);
310 else if (outrate == inrate)
311 return; /* In sync, do not add unnecessary disturbance! */
315 /* Compute playback sample rate */
316 /* This is empirical (especially the shift values).
317 * Feel free to define something smarter. */
318 int adj = sync ? (outrate - inrate)
319 : outrate * ((delta >> 4) + change) / (CLOCK_FREQ << 2);
320 /* This avoids too quick rate variation. It sounds really bad and
321 * causes unstability (e.g. oscillation around the correct rate). */
322 int limit = inrate >> 10;
323 /* However, to improve stability and try to converge, closing to the
324 * nominal rate is favored over drifting from it. */
325 if ((adj > 0) == (sys->rate > inrate))
333 /* This keeps the effective rate within specified range
334 * (+/-AOUT_MAX_RESAMPLING% - see <vlc_aout.h>) of the nominal rate. */
335 limit = inrate * AOUT_MAX_RESAMPLING / 100;
336 if (outrate > inrate + limit)
337 outrate = inrate + limit;
338 if (outrate < inrate - limit)
339 outrate = inrate - limit;
341 /* Apply adjusted sample rate */
342 if (outrate == sys->rate)
344 pa_operation *op = pa_stream_update_sample_rate(s, outrate, NULL, NULL);
345 if (unlikely(op == NULL)) {
346 vlc_pa_error(aout, "cannot change sample rate", sys->context);
349 pa_operation_unref(op);
350 msg_Dbg(aout, "changed sample rate to %u Hz",outrate);
355 /*** Stream helpers ***/
356 static void stream_state_cb(pa_stream *s, void *userdata)
358 pa_threaded_mainloop *mainloop = userdata;
360 switch (pa_stream_get_state(s)) {
361 case PA_STREAM_READY:
362 case PA_STREAM_FAILED:
363 case PA_STREAM_TERMINATED:
364 pa_threaded_mainloop_signal(mainloop, 0);
370 static void stream_event_cb(pa_stream *s, const char *name, pa_proplist *pl,
373 audio_output_t *aout = userdata;
375 if (!strcmp(name, PA_STREAM_EVENT_REQUEST_CORK))
376 aout_PolicyReport(aout, true);
378 if (!strcmp(name, PA_STREAM_EVENT_REQUEST_UNCORK))
379 aout_PolicyReport(aout, false);
381 #if PA_CHECK_VERSION(1,0,0)
382 /* FIXME: expose aout_Restart() directly */
383 if (!strcmp(name, PA_STREAM_EVENT_FORMAT_LOST)) {
384 vlc_value_t dummy = { .i_int = 0 };
386 msg_Dbg (aout, "format lost");
387 aout_ChannelsRestart (VLC_OBJECT(aout), "audio-device",
391 msg_Warn (aout, "unhandled stream event \"%s\"", name);
396 static void stream_moved_cb(pa_stream *s, void *userdata)
398 audio_output_t *aout = userdata;
399 aout_sys_t *sys = aout->sys;
401 uint32_t idx = pa_stream_get_device_index(s);
403 msg_Dbg(aout, "connected to sink %"PRIu32": %s", idx,
404 pa_stream_get_device_name(s));
405 op = pa_context_get_sink_info_by_index(sys->context, idx,
407 if (likely(op != NULL))
408 pa_operation_unref(op);
410 /* Update the variable if someone else moved our stream */
411 var_Change(aout, "audio-device", VLC_VAR_SETVALUE,
412 &(vlc_value_t){ .i_int = idx }, NULL);
414 /* Sink unknown as yet, create stub choice for it */
415 if (var_GetInteger(aout, "audio-device") != idx)
417 var_Change(aout, "audio-device", VLC_VAR_ADDCHOICE,
418 &(vlc_value_t){ .i_int = idx },
419 &(vlc_value_t){ .psz_string = (char *)"?" });
420 var_Change(aout, "audio-device", VLC_VAR_SETVALUE,
421 &(vlc_value_t){ .i_int = idx }, NULL);
425 static void stream_overflow_cb(pa_stream *s, void *userdata)
427 audio_output_t *aout = userdata;
430 msg_Err(aout, "overflow, flushing");
431 op = pa_stream_flush(s, NULL, NULL);
432 if (likely(op != NULL))
433 pa_operation_unref(op);
434 stream_reset_sync(s, aout);
437 static void stream_started_cb(pa_stream *s, void *userdata)
439 audio_output_t *aout = userdata;
441 msg_Dbg(aout, "started");
445 static void stream_suspended_cb(pa_stream *s, void *userdata)
447 audio_output_t *aout = userdata;
449 msg_Dbg(aout, "suspended");
450 stream_reset_sync(s, aout);
453 static void stream_underflow_cb(pa_stream *s, void *userdata)
455 audio_output_t *aout = userdata;
457 msg_Warn(aout, "underflow");
458 stream_stop(s, aout);
459 stream_reset_sync(s, aout);
462 static int stream_wait(pa_stream *stream, pa_threaded_mainloop *mainloop)
464 pa_stream_state_t state;
466 while ((state = pa_stream_get_state(stream)) != PA_STREAM_READY) {
467 if (state == PA_STREAM_FAILED || state == PA_STREAM_TERMINATED)
469 pa_threaded_mainloop_wait(mainloop);
476 static void sink_input_info_cb(pa_context *ctx, const pa_sink_input_info *i,
477 int eol, void *userdata)
479 audio_output_t *aout = userdata;
480 aout_sys_t *sys = aout->sys;
486 sys->cvolume = i->volume; /* cache volume for balance preservation */
488 pa_volume_t volume = pa_cvolume_max(&i->volume);
489 volume = pa_sw_volume_divide(volume, sys->base_volume);
490 aout_VolumeReport(aout, (float)volume / PA_VOLUME_NORM);
491 aout_MuteReport(aout, i->mute);
495 /*** VLC audio output callbacks ***/
497 /* Memory free callback. The block_t address is in front of the data. */
498 static void data_free(void *data)
500 block_t **pp = data, *block;
502 memcpy(&block, pp - 1, sizeof (block));
503 block_Release(block);
506 static void *data_convert(block_t **pp)
508 block_t *block = *pp;
509 /* In most cases, there is enough head room, and this is really cheap: */
510 block = block_Realloc(block, sizeof (block), block->i_buffer);
512 if (unlikely(block == NULL))
515 memcpy(block->p_buffer, &block, sizeof (block));
516 block->p_buffer += sizeof (block);
517 block->i_buffer -= sizeof (block);
518 return block->p_buffer;
522 * Queue one audio frame to the playback stream
524 static void Play(audio_output_t *aout, block_t *block, mtime_t *restrict drift)
526 aout_sys_t *sys = aout->sys;
527 pa_stream *s = sys->stream;
529 assert (sys->paused == VLC_TS_INVALID);
531 const void *ptr = data_convert(&block);
532 if (unlikely(ptr == NULL))
535 size_t len = block->i_buffer;
536 mtime_t pts = block->i_pts + block->i_length;
538 /* Note: The core already holds the output FIFO lock at this point.
539 * Therefore we must not under any circumstances (try to) acquire the
540 * output FIFO lock while the PulseAudio threaded main loop lock is held
541 * (including from PulseAudio stream callbacks). Otherwise lock inversion
542 * will take place, and sooner or later a deadlock. */
543 pa_threaded_mainloop_lock(sys->mainloop);
546 if (pa_stream_is_corked(s) > 0)
547 stream_resync(aout, s);
549 #if 0 /* Fault injector to test underrun recovery */
550 static volatile unsigned u = 0;
551 if ((++u % 1000) == 0) {
552 msg_Err(aout, "fault injection");
553 pa_operation_unref(pa_stream_flush(s, NULL, NULL));
557 if (pa_stream_write(s, ptr, len, data_free, 0, PA_SEEK_RELATIVE) < 0) {
558 vlc_pa_error(aout, "cannot write", sys->context);
559 block_Release(block);
562 pa_threaded_mainloop_unlock(sys->mainloop);
567 * Cork or uncork the playback stream
569 static void Pause(audio_output_t *aout, bool paused, mtime_t date)
571 aout_sys_t *sys = aout->sys;
572 pa_stream *s = sys->stream;
574 pa_threaded_mainloop_lock(sys->mainloop);
578 stream_stop(s, aout);
580 assert (sys->paused != VLC_TS_INVALID);
582 msg_Dbg(aout, "resuming after %"PRId64" us", date);
583 sys->paused = VLC_TS_INVALID;
585 stream_resync(aout, s);
588 pa_threaded_mainloop_unlock(sys->mainloop);
592 * Flush or drain the playback stream
594 static void Flush(audio_output_t *aout, bool wait)
596 aout_sys_t *sys = aout->sys;
597 pa_stream *s = sys->stream;
600 pa_threaded_mainloop_lock(sys->mainloop);
603 op = pa_stream_drain(s, NULL, NULL);
604 /* TODO: wait for drain completion*/
606 op = pa_stream_flush(s, NULL, NULL);
608 pa_operation_unref(op);
609 pa_threaded_mainloop_unlock(sys->mainloop);
612 static int VolumeSet(audio_output_t *aout, float vol)
614 aout_sys_t *sys = aout->sys;
616 uint32_t idx = pa_stream_get_index(sys->stream);
618 /* VLC provides the software volume so convert directly to PulseAudio
619 * software volume, pa_volume_t. This is not a linear amplification factor
620 * so do not use PulseAudio linear amplification! */
621 vol *= PA_VOLUME_NORM;
622 if (unlikely(vol >= PA_VOLUME_MAX))
624 pa_volume_t volume = pa_sw_volume_multiply(lround(vol), sys->base_volume);
626 /* Preserve the balance (VLC does not support it). */
627 pa_cvolume cvolume = sys->cvolume;
628 pa_cvolume_scale(&cvolume, PA_VOLUME_NORM);
629 pa_sw_cvolume_multiply_scalar(&cvolume, &cvolume, volume);
631 assert(pa_cvolume_valid(&cvolume));
633 pa_threaded_mainloop_lock(sys->mainloop);
634 op = pa_context_set_sink_input_volume(sys->context, idx, &cvolume, NULL, NULL);
635 if (likely(op != NULL))
636 pa_operation_unref(op);
637 pa_threaded_mainloop_unlock(sys->mainloop);
642 static int MuteSet(audio_output_t *aout, bool mute)
644 aout_sys_t *sys = aout->sys;
646 uint32_t idx = pa_stream_get_index(sys->stream);
648 pa_threaded_mainloop_lock(sys->mainloop);
649 op = pa_context_set_sink_input_mute(sys->context, idx, mute, NULL, NULL);
650 if (likely(op != NULL))
651 pa_operation_unref(op);
652 pa_threaded_mainloop_unlock(sys->mainloop);
657 static int StreamMove(vlc_object_t *obj, const char *varname, vlc_value_t old,
658 vlc_value_t val, void *userdata)
660 audio_output_t *aout = (audio_output_t *)obj;
661 aout_sys_t *sys = aout->sys;
662 pa_stream *s = userdata;
664 uint32_t idx = pa_stream_get_index(s);
665 uint32_t sink_idx = val.i_int;
667 (void) varname; (void) old;
669 pa_threaded_mainloop_lock(sys->mainloop);
670 op = pa_context_move_sink_input_by_index(sys->context, idx, sink_idx,
672 if (likely(op != NULL)) {
673 pa_operation_unref(op);
674 msg_Dbg(aout, "moving to sink %"PRIu32, sink_idx);
676 vlc_pa_error(obj, "cannot move sink", sys->context);
677 pa_threaded_mainloop_unlock(sys->mainloop);
679 return (op != NULL) ? VLC_SUCCESS : VLC_EGENERIC;
684 * Create a PulseAudio playback stream, a.k.a. a sink input.
686 static int Open(vlc_object_t *obj)
688 #if !PA_CHECK_VERSION(0,9,22)
689 if (!vlc_xlib_init(obj))
693 audio_output_t *aout = (audio_output_t *)obj;
696 /* Sample format specification */
697 struct pa_sample_spec ss;
698 vlc_fourcc_t format = aout->format.i_format;
699 #if PA_CHECK_VERSION(1,0,0)
700 pa_encoding_t encoding = PA_ENCODING_INVALID;
706 format = VLC_CODEC_F32B;
708 ss.format = PA_SAMPLE_FLOAT32BE;
711 format = VLC_CODEC_F32L;
713 ss.format = PA_SAMPLE_FLOAT32LE;
716 ss.format = PA_SAMPLE_S32BE;
719 ss.format = PA_SAMPLE_S32LE;
722 ss.format = PA_SAMPLE_S24BE;
725 ss.format = PA_SAMPLE_S24LE;
728 ss.format = PA_SAMPLE_S16BE;
731 ss.format = PA_SAMPLE_S16LE;
734 format = VLC_CODEC_U8;
736 ss.format = PA_SAMPLE_U8;
738 #if PA_CHECK_VERSION(1,0,0)
740 format = VLC_CODEC_SPDIFL;
741 encoding = PA_ENCODING_AC3_IEC61937;
742 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
744 /*case VLC_CODEC_EAC3:
745 format = VLC_CODEC_SPDIFL FIXME;
746 encoding = PA_ENCODING_EAC3_IEC61937;
747 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
750 format = VLC_CODEC_SPDIFL FIXME;
751 encoding = PA_ENCODING_MPEG_IEC61937;
752 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
755 format = VLC_CODEC_SPDIFL;
756 encoding = PA_ENCODING_DTS_IEC61937;
757 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
763 format = VLC_CODEC_FL32;
764 ss.format = PA_SAMPLE_FLOAT32NE;
768 format = VLC_CODEC_S16N;
769 ss.format = PA_SAMPLE_S16NE;
774 ss.rate = aout->format.i_rate;
775 ss.channels = aout_FormatNbChannels(&aout->format);
776 if (!pa_sample_spec_valid(&ss)) {
777 msg_Err(aout, "unsupported sample specification");
781 /* Channel mapping (order defined in vlc_aout.h) */
782 struct pa_channel_map map;
785 if (aout->format.i_physical_channels & AOUT_CHAN_LEFT)
786 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
787 if (aout->format.i_physical_channels & AOUT_CHAN_RIGHT)
788 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
789 if (aout->format.i_physical_channels & AOUT_CHAN_MIDDLELEFT)
790 map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_LEFT;
791 if (aout->format.i_physical_channels & AOUT_CHAN_MIDDLERIGHT)
792 map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_RIGHT;
793 if (aout->format.i_physical_channels & AOUT_CHAN_REARLEFT)
794 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_LEFT;
795 if (aout->format.i_physical_channels & AOUT_CHAN_REARRIGHT)
796 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_RIGHT;
797 if (aout->format.i_physical_channels & AOUT_CHAN_REARCENTER)
798 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_CENTER;
799 if (aout->format.i_physical_channels & AOUT_CHAN_CENTER)
801 if (ss.channels == 1)
802 map.map[map.channels++] = PA_CHANNEL_POSITION_MONO;
804 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_CENTER;
806 if (aout->format.i_physical_channels & AOUT_CHAN_LFE)
807 map.map[map.channels++] = PA_CHANNEL_POSITION_LFE;
809 for (unsigned i = 0; map.channels < ss.channels; i++) {
810 map.map[map.channels++] = PA_CHANNEL_POSITION_AUX0 + i;
811 msg_Warn(aout, "mapping channel %"PRIu8" to AUX%u", map.channels, i);
814 if (!pa_channel_map_valid(&map)) {
815 msg_Err(aout, "unsupported channel map");
818 const char *name = pa_channel_map_to_name(&map);
819 msg_Dbg(aout, "using %s channel map", (name != NULL) ? name : "?");
822 /* Stream parameters */
823 const pa_stream_flags_t flags = PA_STREAM_START_CORKED
824 //| PA_STREAM_INTERPOLATE_TIMING
825 | PA_STREAM_NOT_MONOTONIC
826 | PA_STREAM_AUTO_TIMING_UPDATE
827 | PA_STREAM_VARIABLE_RATE;
829 struct pa_buffer_attr attr;
831 /* PulseAudio assumes that tlength bytes are available in the buffer. Thus
832 * we need to be conservative and set the minimum value that the VLC
833 * audio decoder thread warrants. Otherwise, PulseAudio buffers will
834 * underrun on hardware with large buffers. VLC keeps at least
835 * AOUT_MIN_PREPARE and at most AOUT_MAX_PREPARE worth of audio buffers.
836 * TODO? tlength could be adaptively increased to reduce wakeups. */
837 attr.tlength = pa_usec_to_bytes(AOUT_MIN_PREPARE_TIME, &ss);
838 attr.prebuf = 0; /* trigger manually */
840 attr.fragsize = 0; /* not used for output */
842 /* Allocate structures */
843 aout_sys_t *sys = malloc(sizeof(*sys));
844 if (unlikely(sys == NULL))
847 pa_context *ctx = vlc_pa_connect(obj, &sys->mainloop);
858 sys->paused = VLC_TS_INVALID;
859 sys->pts = VLC_TS_INVALID;
864 sys->base_volume = PA_VOLUME_NORM;
865 pa_cvolume_set(&sys->cvolume, ss.channels, PA_VOLUME_NORM);
867 #if PA_CHECK_VERSION(1,0,0)
868 pa_format_info *formatv[2];
869 unsigned formatc = 0;
871 /* Favor digital pass-through if available*/
872 if (encoding != PA_ENCODING_INVALID) {
873 formatv[formatc] = pa_format_info_new();
874 formatv[formatc]->encoding = encoding;
875 pa_format_info_set_rate(formatv[formatc], ss.rate);
876 pa_format_info_set_channels(formatv[formatc], ss.channels);
877 pa_format_info_set_channel_map(formatv[formatc], &map);
881 /* Fallback to PCM */
882 formatv[formatc] = pa_format_info_new();
883 formatv[formatc]->encoding = PA_ENCODING_PCM;
884 pa_format_info_set_sample_format(formatv[formatc], ss.format);
885 pa_format_info_set_rate(formatv[formatc], ss.rate);
886 pa_format_info_set_channels(formatv[formatc], ss.channels);
887 pa_format_info_set_channel_map(formatv[formatc], &map);
890 /* Create a playback stream */
892 pa_proplist *props = pa_proplist_new();
893 if (likely(props != NULL))
894 /* TODO: set other stream properties */
895 pa_proplist_sets (props, PA_PROP_MEDIA_ROLE, "video");
897 pa_threaded_mainloop_lock(sys->mainloop);
898 s = pa_stream_new_extended(ctx, "audio stream", formatv, formatc, props);
899 if (likely(props != NULL))
900 pa_proplist_free(props);
902 for (unsigned i = 0; i < formatc; i++)
903 pa_format_info_free(formatv[i]);
905 pa_threaded_mainloop_lock(sys->mainloop);
906 pa_stream *s = pa_stream_new(ctx, "audio stream", &ss, &map);
909 vlc_pa_error(obj, "stream creation failure", ctx);
913 pa_stream_set_state_callback(s, stream_state_cb, sys->mainloop);
914 pa_stream_set_event_callback(s, stream_event_cb, aout);
915 pa_stream_set_latency_update_callback(s, stream_latency_cb, aout);
916 pa_stream_set_moved_callback(s, stream_moved_cb, aout);
917 pa_stream_set_overflow_callback(s, stream_overflow_cb, aout);
918 pa_stream_set_started_callback(s, stream_started_cb, aout);
919 pa_stream_set_suspended_callback(s, stream_suspended_cb, aout);
920 pa_stream_set_underflow_callback(s, stream_underflow_cb, aout);
922 if (pa_stream_connect_playback(s, NULL, &attr, flags, NULL, NULL) < 0
923 || stream_wait(s, sys->mainloop)) {
924 vlc_pa_error(obj, "stream connection failure", ctx);
928 #if PA_CHECK_VERSION(1,0,0)
929 if (encoding != PA_ENCODING_INVALID) {
930 const pa_format_info *info = pa_stream_get_format_info(s);
932 assert (info != NULL);
933 if (pa_format_info_is_pcm (info)) {
934 msg_Dbg(aout, "digital pass-through not available");
935 format = HAVE_FPU ? VLC_CODEC_FL32 : VLC_CODEC_S16N;
937 msg_Dbg(aout, "digital pass-through enabled");
938 pa_stream_set_latency_update_callback(s, NULL, NULL);
943 const struct pa_buffer_attr *pba = pa_stream_get_buffer_attr(s);
944 msg_Dbg(aout, "using buffer metrics: maxlength=%u, tlength=%u, "
945 "prebuf=%u, minreq=%u",
946 pba->maxlength, pba->tlength, pba->prebuf, pba->minreq);
948 var_Create(aout, "audio-device", VLC_VAR_INTEGER|VLC_VAR_HASCHOICE);
949 var_Change(aout, "audio-device", VLC_VAR_SETTEXT,
950 &(vlc_value_t){ .psz_string = (char *)_("Audio device") },
952 var_AddCallback (aout, "audio-device", StreamMove, s);
953 op = pa_context_get_sink_info_list(ctx, sink_list_cb, aout);
954 /* We may need to wait for completion... once LibVLC supports this */
956 pa_operation_unref(op);
957 stream_moved_cb(s, aout);
960 const pa_subscription_mask_t mask = PA_SUBSCRIPTION_MASK_SINK
961 | PA_SUBSCRIPTION_MASK_SINK_INPUT;
962 pa_context_set_subscribe_callback(ctx, context_cb, aout);
963 op = pa_context_subscribe(ctx, mask, NULL, NULL);
964 if (likely(op != NULL))
965 pa_operation_unref(op);
966 pa_threaded_mainloop_unlock(sys->mainloop);
968 aout->format.i_format = format;
969 aout->pf_play = Play;
970 aout->pf_pause = Pause;
971 aout->pf_flush = Flush;
972 aout->volume_set = VolumeSet;
973 aout->mute_set = MuteSet;
977 pa_threaded_mainloop_unlock(sys->mainloop);
983 * Removes a PulseAudio playback stream
985 static void Close (vlc_object_t *obj)
987 audio_output_t *aout = (audio_output_t *)obj;
988 aout_sys_t *sys = aout->sys;
989 pa_context *ctx = sys->context;
990 pa_stream *s = sys->stream;
993 /* The callback takes mainloop lock, so it CANNOT be held here! */
994 var_DelCallback (aout, "audio-device", StreamMove, s);
995 var_Destroy (aout, "audio-device");
997 pa_threaded_mainloop_lock(sys->mainloop);
998 if (unlikely(sys->trigger != NULL))
999 vlc_pa_rttime_free(sys->mainloop, sys->trigger);
1000 pa_stream_disconnect(s);
1002 /* Clear all callbacks */
1003 pa_stream_set_state_callback(s, NULL, NULL);
1004 pa_stream_set_event_callback(s, NULL, NULL);
1005 pa_stream_set_latency_update_callback(s, NULL, NULL);
1006 pa_stream_set_moved_callback(s, NULL, NULL);
1007 pa_stream_set_overflow_callback(s, NULL, NULL);
1008 pa_stream_set_started_callback(s, NULL, NULL);
1009 pa_stream_set_suspended_callback(s, NULL, NULL);
1010 pa_stream_set_underflow_callback(s, NULL, NULL);
1011 pa_context_set_subscribe_callback(ctx, NULL, NULL);
1014 pa_threaded_mainloop_unlock(sys->mainloop);
1017 vlc_pa_disconnect(obj, ctx, sys->mainloop);