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>
35 #include <vlc_pulse.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 * - pause input on policy event
55 * - resample to compensate for long term drift
56 * - select music or video stream property correctly (?)
57 * - set further appropriate stream properties
58 * - update output devices list dynamically
62 * Be careful what you do when the PulseAudio mainloop is held, which is to say
63 * within PulseAudio callbacks, or after vlc_pa_lock().
64 * In particular, a VLC variable callback cannot be triggered nor deleted with
65 * the PulseAudio mainloop lock held, if the callback acquires the lock. */
69 pa_stream *stream; /**< PulseAudio playback stream object */
70 pa_context *context; /**< PulseAudio connection context */
71 pa_time_event *trigger; /**< Deferred stream trigger */
72 pa_volume_t base_volume; /**< 0dB reference volume */
73 pa_cvolume cvolume; /**< actual sink input volume */
74 mtime_t paused; /**< Time when (last) paused */
75 mtime_t pts; /**< Play time of buffer write offset */
76 mtime_t desync; /**< Measured desynchronization */
77 unsigned rate; /**< Current stream sample rate */
80 static void sink_list_cb(pa_context *, const pa_sink_info *, int, void *);
81 static void sink_input_info_cb(pa_context *, const pa_sink_input_info *,
85 static void context_cb(pa_context *ctx, pa_subscription_event_type_t type,
86 uint32_t idx, void *userdata)
88 audio_output_t *aout = userdata;
89 aout_sys_t *sys = aout->sys;
92 switch (type & PA_SUBSCRIPTION_EVENT_FACILITY_MASK)
94 case PA_SUBSCRIPTION_EVENT_SINK:
95 switch (type & PA_SUBSCRIPTION_EVENT_TYPE_MASK)
97 case PA_SUBSCRIPTION_EVENT_NEW:
98 case PA_SUBSCRIPTION_EVENT_CHANGE:
99 op = pa_context_get_sink_info_by_index(ctx, idx, sink_list_cb, aout);
100 if (likely(op != NULL))
101 pa_operation_unref(op);
104 case PA_SUBSCRIPTION_EVENT_REMOVE:
105 var_Change(aout, "audio-device", VLC_VAR_DELCHOICE,
106 &(vlc_value_t){ .i_int = idx }, NULL);
111 case PA_SUBSCRIPTION_EVENT_SINK_INPUT:
112 if (idx != pa_stream_get_index(sys->stream))
113 break; /* only interested in our sink input */
115 /* Gee... PA will not provide the infos directly in the event. */
116 switch (type & PA_SUBSCRIPTION_EVENT_TYPE_MASK)
118 case PA_SUBSCRIPTION_EVENT_REMOVE:
119 msg_Err(aout, "sink input killed!");
123 op = pa_context_get_sink_input_info(ctx, idx, sink_input_info_cb,
125 if (likely(op != NULL))
126 pa_operation_unref(op);
131 default: /* unsubscribed facility?! */
138 static void sink_list_cb(pa_context *c, const pa_sink_info *i, int eol,
141 audio_output_t *aout = userdata;
142 vlc_value_t val, text;
148 msg_Dbg(aout, "listing sink %s (%"PRIu32"): %s", i->name, i->index,
150 val.i_int = i->index;
151 text.psz_string = (char *)i->description;
152 var_Change(aout, "audio-device", VLC_VAR_DELCHOICE, &val, NULL);
153 var_Change(aout, "audio-device", VLC_VAR_ADDCHOICE, &val, &text);
156 static void sink_info_cb(pa_context *c, const pa_sink_info *i, int eol,
159 audio_output_t *aout = userdata;
160 aout_sys_t *sys = aout->sys;
166 /* PulseAudio flat volume NORM / 100% / 0dB corresponds to no software
167 * amplification and maximum hardware amplification.
168 * VLC maps DEFAULT / 100% to no gain at all (software/hardware).
169 * Thus we need to use the sink base_volume as a multiplier,
170 * if and only if flat volume is active for our current sink. */
171 if (i->flags & PA_SINK_FLAT_VOLUME)
172 sys->base_volume = i->base_volume;
174 sys->base_volume = PA_VOLUME_NORM;
175 msg_Dbg(aout, "base volume: %"PRIu32, sys->base_volume);
179 /*** Latency management and lip synchronization ***/
180 static mtime_t vlc_pa_get_latency(audio_output_t *aout,
181 pa_context *ctx, pa_stream *s)
186 if (pa_stream_get_latency(s, &latency, &negative)) {
187 if (pa_context_errno (ctx) != PA_ERR_NODATA)
188 vlc_pa_error(aout, "unknown latency", ctx);
189 return VLC_TS_INVALID;
191 return negative ? -latency : +latency;
194 static void stream_reset_sync(pa_stream *s, audio_output_t *aout)
196 aout_sys_t *sys = aout->sys;
197 const unsigned rate = aout->format.i_rate;
199 sys->pts = VLC_TS_INVALID;
201 pa_operation *op = pa_stream_update_sample_rate(s, rate, NULL, NULL);
202 if (unlikely(op == NULL))
204 pa_operation_unref(op);
208 static void stream_start(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->trigger);
218 op = pa_stream_cork(s, 0, NULL, NULL);
220 pa_operation_unref(op);
221 op = pa_stream_trigger(s, NULL, NULL);
222 if (likely(op != NULL))
223 pa_operation_unref(op);
226 static void stream_stop(pa_stream *s, audio_output_t *aout)
228 aout_sys_t *sys = aout->sys;
231 if (sys->trigger != NULL) {
232 vlc_pa_rttime_free(sys->trigger);
236 op = pa_stream_cork(s, 1, NULL, NULL);
238 pa_operation_unref(op);
241 static void stream_trigger_cb(pa_mainloop_api *api, pa_time_event *e,
242 const struct timeval *tv, void *userdata)
244 audio_output_t *aout = userdata;
245 aout_sys_t *sys = aout->sys;
247 msg_Dbg(aout, "starting deferred");
248 assert (sys->trigger == e);
249 stream_start(sys->stream, aout);
250 (void) api; (void) e; (void) tv;
254 * Starts or resumes the playback stream.
255 * Tries start playing back audio samples at the most accurate time
256 * in order to minimize desync and resampling during early playback.
257 * @note PulseAudio lock required.
259 static void stream_resync(audio_output_t *aout, pa_stream *s)
261 aout_sys_t *sys = aout->sys;
264 assert (pa_stream_is_corked(s) > 0);
265 assert (sys->pts != VLC_TS_INVALID);
267 delta = vlc_pa_get_latency(aout, sys->context, s);
268 if (unlikely(delta == VLC_TS_INVALID))
269 delta = 0; /* screwed */
271 delta = (sys->pts - mdate()) - delta;
273 if (sys->trigger == NULL) {
274 msg_Dbg(aout, "deferring start (%"PRId64" us)", delta);
275 delta += pa_rtclock_now();
276 sys->trigger = pa_context_rttime_new(sys->context, delta,
277 stream_trigger_cb, aout);
280 msg_Warn(aout, "starting late (%"PRId64" us)", delta);
281 stream_start(s, aout);
285 static void stream_latency_cb(pa_stream *s, void *userdata)
287 audio_output_t *aout = userdata;
288 aout_sys_t *sys = aout->sys;
289 mtime_t delta, change;
291 if (pa_stream_is_corked(s))
293 if (sys->pts == VLC_TS_INVALID)
295 msg_Dbg(aout, "missing latency from input");
299 /* Compute lip desynchronization */
300 delta = vlc_pa_get_latency(aout, sys->context, s);
301 if (delta == VLC_TS_INVALID)
304 delta = (sys->pts - mdate()) - delta;
305 change = delta - sys->desync;
307 //msg_Dbg(aout, "desync: %+"PRId64" us (variation: %+"PRId64" us)",
310 const unsigned inrate = aout->format.i_rate;
311 unsigned outrate = sys->rate;
314 if (delta < -AOUT_MAX_PTS_DELAY)
315 msg_Warn(aout, "too late by %"PRId64" us", -delta);
316 else if (delta > +AOUT_MAX_PTS_ADVANCE)
317 msg_Warn(aout, "too early by %"PRId64" us", delta);
318 else if (outrate == inrate)
319 return; /* In sync, do not add unnecessary disturbance! */
323 /* Compute playback sample rate */
324 /* This is empirical (especially the shift values).
325 * Feel free to define something smarter. */
326 int adj = sync ? (outrate - inrate)
327 : outrate * ((delta >> 4) + change) / (CLOCK_FREQ << 2);
328 /* This avoids too quick rate variation. It sounds really bad and
329 * causes unstability (e.g. oscillation around the correct rate). */
330 int limit = inrate >> 10;
331 /* However, to improve stability and try to converge, closing to the
332 * nominal rate is favored over drifting from it. */
333 if ((adj > 0) == (sys->rate > inrate))
341 /* This keeps the effective rate within specified range
342 * (+/-AOUT_MAX_RESAMPLING% - see <vlc_aout.h>) of the nominal rate. */
343 limit = inrate * AOUT_MAX_RESAMPLING / 100;
344 if (outrate > inrate + limit)
345 outrate = inrate + limit;
346 if (outrate < inrate - limit)
347 outrate = inrate - limit;
349 /* Apply adjusted sample rate */
350 if (outrate == sys->rate)
352 pa_operation *op = pa_stream_update_sample_rate(s, outrate, NULL, NULL);
353 if (unlikely(op == NULL)) {
354 vlc_pa_error(aout, "cannot change sample rate", sys->context);
357 pa_operation_unref(op);
358 msg_Dbg(aout, "changed sample rate to %u Hz",outrate);
363 /*** Stream helpers ***/
364 static void stream_state_cb(pa_stream *s, void *userdata)
366 switch (pa_stream_get_state(s)) {
367 case PA_STREAM_READY:
368 case PA_STREAM_FAILED:
369 case PA_STREAM_TERMINATED:
377 static void stream_event_cb(pa_stream *s, const char *name, pa_proplist *pl,
380 audio_output_t *aout = userdata;
382 #if PA_CHECK_VERSION(1,0,0)
383 /* FIXME: expose aout_Restart() directly */
384 if (!strcmp(name, PA_STREAM_EVENT_FORMAT_LOST)) {
385 vlc_value_t dummy = { .i_int = 0 };
387 msg_Dbg (aout, "format lost");
388 aout_ChannelsRestart (VLC_OBJECT(aout), "audio-device",
392 msg_Warn (aout, "unhandled event %s", name);
397 static void stream_moved_cb(pa_stream *s, void *userdata)
399 audio_output_t *aout = userdata;
400 aout_sys_t *sys = aout->sys;
402 uint32_t idx = pa_stream_get_device_index(s);
404 msg_Dbg(aout, "connected to sink %"PRIu32": %s", idx,
405 pa_stream_get_device_name(s));
406 op = pa_context_get_sink_info_by_index(sys->context, idx,
408 if (likely(op != NULL))
409 pa_operation_unref(op);
411 /* Update the variable if someone else moved our stream */
412 var_Change(aout, "audio-device", VLC_VAR_SETVALUE,
413 &(vlc_value_t){ .i_int = idx }, NULL);
415 /* Sink unknown as yet, create stub choice for it */
416 if (var_GetInteger(aout, "audio-device") != idx)
418 var_Change(aout, "audio-device", VLC_VAR_ADDCHOICE,
419 &(vlc_value_t){ .i_int = idx },
420 &(vlc_value_t){ .psz_string = (char *)"?" });
421 var_Change(aout, "audio-device", VLC_VAR_SETVALUE,
422 &(vlc_value_t){ .i_int = idx }, NULL);
426 static void stream_overflow_cb(pa_stream *s, void *userdata)
428 audio_output_t *aout = userdata;
430 msg_Err(aout, "overflow");
434 static void stream_started_cb(pa_stream *s, void *userdata)
436 audio_output_t *aout = userdata;
438 msg_Dbg(aout, "started");
442 static void stream_suspended_cb(pa_stream *s, void *userdata)
444 audio_output_t *aout = userdata;
446 msg_Dbg(aout, "suspended");
447 stream_reset_sync(s, aout);
450 static void stream_underflow_cb(pa_stream *s, void *userdata)
452 audio_output_t *aout = userdata;
454 msg_Warn(aout, "underflow");
455 stream_stop(s, aout);
456 stream_reset_sync(s, aout);
459 static int stream_wait(pa_stream *stream)
461 pa_stream_state_t state;
463 while ((state = pa_stream_get_state(stream)) != PA_STREAM_READY) {
464 if (state == PA_STREAM_FAILED || state == PA_STREAM_TERMINATED)
473 static void sink_input_info_cb(pa_context *ctx, const pa_sink_input_info *i,
474 int eol, void *userdata)
476 audio_output_t *aout = userdata;
477 aout_sys_t *sys = aout->sys;
484 sys->cvolume = i->volume;
485 volume = pa_cvolume_max(&i->volume) / (float)PA_VOLUME_NORM;
486 aout_VolumeHardSet(aout, volume, i->mute);
490 /*** VLC audio output callbacks ***/
492 /* Memory free callback. The block_t address is in front of the data. */
493 static void data_free(void *data)
495 block_t **pp = data, *block;
497 memcpy(&block, pp - 1, sizeof (block));
498 block_Release(block);
501 static void *data_convert(block_t **pp)
503 block_t *block = *pp;
504 /* In most cases, there is enough head room, and this is really cheap: */
505 block = block_Realloc(block, sizeof (block), block->i_buffer);
507 if (unlikely(block == NULL))
510 memcpy(block->p_buffer, &block, sizeof (block));
511 block->p_buffer += sizeof (block);
512 block->i_buffer -= sizeof (block);
513 return block->p_buffer;
517 * Queue one audio frame to the playabck stream
519 static void Play(audio_output_t *aout, block_t *block)
521 aout_sys_t *sys = aout->sys;
522 pa_stream *s = sys->stream;
524 const void *ptr = data_convert(&block);
525 if (unlikely(ptr == NULL))
528 size_t len = block->i_buffer;
529 mtime_t pts = block->i_pts + block->i_length;
531 /* Note: The core already holds the output FIFO lock at this point.
532 * Therefore we must not under any circumstances (try to) acquire the
533 * output FIFO lock while the PulseAudio threaded main loop lock is held
534 * (including from PulseAudio stream callbacks). Otherwise lock inversion
535 * will take place, and sooner or later a deadlock. */
539 if (pa_stream_is_corked(s) > 0)
540 stream_resync(aout, s);
542 #if 0 /* Fault injector to test underrun recovery */
543 static volatile unsigned u = 0;
544 if ((++u % 1000) == 0) {
545 msg_Err(aout, "fault injection");
546 pa_operation_unref(pa_stream_flush(s, NULL, NULL));
550 if (pa_stream_write(s, ptr, len, data_free, 0, PA_SEEK_RELATIVE) < 0) {
551 vlc_pa_error(aout, "cannot write", sys->context);
552 block_Release(block);
559 * Cork or uncork the playback stream
561 static void Pause(audio_output_t *aout, bool paused, mtime_t date)
563 aout_sys_t *sys = aout->sys;
564 pa_stream *s = sys->stream;
570 stream_stop(s, aout);
572 assert (sys->paused != VLC_TS_INVALID);
574 msg_Dbg(aout, "resuming after %"PRId64" us", date);
575 sys->paused = VLC_TS_INVALID;
577 stream_resync(aout, s);
584 * Flush or drain the playback stream
586 static void Flush(audio_output_t *aout, bool wait)
588 aout_sys_t *sys = aout->sys;
589 pa_stream *s = sys->stream;
595 op = pa_stream_drain(s, NULL, NULL);
596 /* TODO: wait for drain completion*/
598 op = pa_stream_flush(s, NULL, NULL);
600 pa_operation_unref(op);
604 static int VolumeSet(audio_output_t *aout, float vol, bool mute)
606 aout_sys_t *sys = aout->sys;
608 uint32_t idx = pa_stream_get_index(sys->stream);
610 pa_cvolume cvolume = sys->cvolume;
611 pa_volume_t volume = sys->base_volume;
613 pa_cvolume_scale(&cvolume, PA_VOLUME_NORM); /* preserve balance */
615 /* VLC provides the software volume so convert directly to PulseAudio
616 * software volume, pa_volume_t. This is not a linear amplification factor
617 * so do not use PulseAudio linear amplification! */
618 vol *= PA_VOLUME_NORM;
619 if (unlikely(vol >= PA_VOLUME_MAX))
621 volume = pa_sw_volume_multiply(volume, lround(vol));
622 pa_sw_cvolume_multiply_scalar(&cvolume, &cvolume, volume);
624 assert(pa_cvolume_valid(&cvolume));
627 op = pa_context_set_sink_input_volume(sys->context, idx, &cvolume, NULL, NULL);
628 if (likely(op != NULL))
629 pa_operation_unref(op);
630 op = pa_context_set_sink_input_mute(sys->context, idx, mute, NULL, NULL);
631 if (likely(op != NULL))
632 pa_operation_unref(op);
638 static int StreamMove(vlc_object_t *obj, const char *varname, vlc_value_t old,
639 vlc_value_t val, void *userdata)
641 audio_output_t *aout = (audio_output_t *)obj;
642 aout_sys_t *sys = aout->sys;
643 pa_stream *s = userdata;
645 uint32_t idx = pa_stream_get_index(s);
646 uint32_t sink_idx = val.i_int;
648 (void) varname; (void) old;
651 op = pa_context_move_sink_input_by_index(sys->context, idx, sink_idx,
653 if (likely(op != NULL)) {
654 pa_operation_unref(op);
655 msg_Dbg(aout, "moving to sink %"PRIu32, sink_idx);
657 vlc_pa_error(obj, "cannot move sink", sys->context);
660 return (op != NULL) ? VLC_SUCCESS : VLC_EGENERIC;
665 * Create a PulseAudio playback stream, a.k.a. a sink input.
667 static int Open(vlc_object_t *obj)
669 #if !PA_CHECK_VERSION(0,9,22)
670 if (!vlc_xlib_init(obj))
674 audio_output_t *aout = (audio_output_t *)obj;
677 /* Sample format specification */
678 struct pa_sample_spec ss;
679 vlc_fourcc_t format = aout->format.i_format;
680 #if PA_CHECK_VERSION(1,0,0)
681 pa_encoding_t encoding = PA_ENCODING_INVALID;
687 format = VLC_CODEC_F32B;
689 ss.format = PA_SAMPLE_FLOAT32BE;
692 format = VLC_CODEC_F32L;
694 ss.format = PA_SAMPLE_FLOAT32LE;
697 format = VLC_CODEC_FL32;
698 ss.format = PA_SAMPLE_FLOAT32NE;
701 ss.format = PA_SAMPLE_S32BE;
704 ss.format = PA_SAMPLE_S32LE;
707 ss.format = PA_SAMPLE_S24BE;
710 ss.format = PA_SAMPLE_S24LE;
713 ss.format = PA_SAMPLE_S16BE;
716 ss.format = PA_SAMPLE_S16LE;
719 format = VLC_CODEC_U8;
721 ss.format = PA_SAMPLE_U8;
723 #if PA_CHECK_VERSION(1,0,0)
725 format = VLC_CODEC_SPDIFL;
726 encoding = PA_ENCODING_AC3_IEC61937;
727 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
729 /*case VLC_CODEC_EAC3:
730 format = VLC_CODEC_SPDIFL FIXME;
731 encoding = PA_ENCODING_EAC3_IEC61937;
732 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
735 format = VLC_CODEC_SPDIFL FIXME;
736 encoding = PA_ENCODING_MPEG_IEC61937;
737 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
740 format = VLC_CODEC_SPDIFL;
741 encoding = PA_ENCODING_DTS_IEC61937;
742 ss.format = HAVE_FPU ? PA_SAMPLE_FLOAT32NE : PA_SAMPLE_S16NE;
748 format = VLC_CODEC_FL32;
749 ss.format = PA_SAMPLE_FLOAT32NE;
753 format = VLC_CODEC_S16N;
754 ss.format = PA_SAMPLE_S16NE;
759 ss.rate = aout->format.i_rate;
760 ss.channels = aout_FormatNbChannels(&aout->format);
761 if (!pa_sample_spec_valid(&ss)) {
762 msg_Err(aout, "unsupported sample specification");
766 /* Channel mapping (order defined in vlc_aout.h) */
767 struct pa_channel_map map;
770 if (aout->format.i_physical_channels & AOUT_CHAN_LEFT)
771 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_LEFT;
772 if (aout->format.i_physical_channels & AOUT_CHAN_RIGHT)
773 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_RIGHT;
774 if (aout->format.i_physical_channels & AOUT_CHAN_MIDDLELEFT)
775 map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_LEFT;
776 if (aout->format.i_physical_channels & AOUT_CHAN_MIDDLERIGHT)
777 map.map[map.channels++] = PA_CHANNEL_POSITION_SIDE_RIGHT;
778 if (aout->format.i_physical_channels & AOUT_CHAN_REARLEFT)
779 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_LEFT;
780 if (aout->format.i_physical_channels & AOUT_CHAN_REARRIGHT)
781 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_RIGHT;
782 if (aout->format.i_physical_channels & AOUT_CHAN_REARCENTER)
783 map.map[map.channels++] = PA_CHANNEL_POSITION_REAR_CENTER;
784 if (aout->format.i_physical_channels & AOUT_CHAN_CENTER)
786 if (ss.channels == 1)
787 map.map[map.channels++] = PA_CHANNEL_POSITION_MONO;
789 map.map[map.channels++] = PA_CHANNEL_POSITION_FRONT_CENTER;
791 if (aout->format.i_physical_channels & AOUT_CHAN_LFE)
792 map.map[map.channels++] = PA_CHANNEL_POSITION_LFE;
794 for (unsigned i = 0; map.channels < ss.channels; i++) {
795 map.map[map.channels++] = PA_CHANNEL_POSITION_AUX0 + i;
796 msg_Warn(aout, "mapping channel %"PRIu8" to AUX%u", map.channels, i);
799 if (!pa_channel_map_valid(&map)) {
800 msg_Err(aout, "unsupported channel map");
803 const char *name = pa_channel_map_to_name(&map);
804 msg_Dbg(aout, "using %s channel map", (name != NULL) ? name : "?");
807 /* Stream parameters */
808 const pa_stream_flags_t flags = PA_STREAM_START_CORKED
809 //| PA_STREAM_INTERPOLATE_TIMING
810 | PA_STREAM_AUTO_TIMING_UPDATE
811 | PA_STREAM_VARIABLE_RATE;
813 struct pa_buffer_attr attr;
815 /* PulseAudio assumes that tlength bytes are available in the buffer. Thus
816 * we need to be conservative and set the minimum value that the VLC
817 * audio decoder thread warrants. Otherwise, PulseAudio buffers will
818 * underrun on hardware with large buffers. VLC keeps at least
819 * AOUT_MIN_PREPARE and at most AOUT_MAX_PREPARE worth of audio buffers.
820 * TODO? tlength could be adaptively increased to reduce wakeups. */
821 attr.tlength = pa_usec_to_bytes(AOUT_MIN_PREPARE_TIME, &ss);
822 attr.prebuf = 0; /* trigger manually */
824 attr.fragsize = 0; /* not used for output */
826 /* Allocate structures */
827 aout_sys_t *sys = malloc(sizeof(*sys));
828 if (unlikely(sys == NULL))
831 pa_context *ctx = vlc_pa_connect (obj);
842 sys->paused = VLC_TS_INVALID;
843 sys->pts = VLC_TS_INVALID;
848 const pa_subscription_mask_t mask = PA_SUBSCRIPTION_MASK_SINK
849 | PA_SUBSCRIPTION_MASK_SINK_INPUT;
851 pa_context_set_subscribe_callback(ctx, context_cb, aout);
852 op = pa_context_subscribe(ctx, mask, NULL, NULL);
853 if (likely(op != NULL))
854 pa_operation_unref(op);
857 sys->base_volume = PA_VOLUME_NORM;
858 pa_cvolume_set(&sys->cvolume, ss.channels, PA_VOLUME_NORM);
860 #if PA_CHECK_VERSION(1,0,0)
861 pa_format_info *formatv[2];
862 unsigned formatc = 0;
864 /* Favor digital pass-through if available*/
865 if (encoding != PA_ENCODING_INVALID) {
866 formatv[formatc] = pa_format_info_new();
867 formatv[formatc]->encoding = encoding;
868 pa_format_info_set_rate(formatv[formatc], ss.rate);
869 pa_format_info_set_channels(formatv[formatc], ss.channels);
873 /* Fallback to PCM */
874 formatv[formatc] = pa_format_info_new();
875 formatv[formatc]->encoding = PA_ENCODING_PCM;
876 pa_format_info_set_sample_format(formatv[formatc], ss.format);
877 pa_format_info_set_rate(formatv[formatc], ss.rate);
878 pa_format_info_set_channels(formatv[formatc], ss.channels);
881 /* Create a playback stream */
885 s = pa_stream_new_extended(ctx, "audio stream", formatv, formatc, NULL);
887 for (unsigned i = 0; i < formatc; i++)
888 pa_format_info_free(formatv[i]);
891 pa_stream *s = pa_stream_new(ctx, "audio stream", &ss, &map);
894 vlc_pa_error(obj, "stream creation failure", ctx);
898 pa_stream_set_state_callback(s, stream_state_cb, NULL);
899 pa_stream_set_event_callback(s, stream_event_cb, aout);
900 pa_stream_set_latency_update_callback(s, stream_latency_cb, aout);
901 pa_stream_set_moved_callback(s, stream_moved_cb, aout);
902 pa_stream_set_overflow_callback(s, stream_overflow_cb, aout);
903 pa_stream_set_started_callback(s, stream_started_cb, aout);
904 pa_stream_set_suspended_callback(s, stream_suspended_cb, aout);
905 pa_stream_set_underflow_callback(s, stream_underflow_cb, aout);
907 if (pa_stream_connect_playback(s, NULL, &attr, flags, NULL, NULL) < 0
909 vlc_pa_error(obj, "stream connection failure", ctx);
913 #if PA_CHECK_VERSION(1,0,0)
914 if (encoding != PA_ENCODING_INVALID) {
915 const pa_format_info *info = pa_stream_get_format_info(s);
917 assert (info != NULL);
918 if (pa_format_info_is_pcm (info)) {
919 msg_Dbg(aout, "digital pass-through not available");
920 format = HAVE_FPU ? VLC_CODEC_FL32 : VLC_CODEC_S16N;
922 msg_Dbg(aout, "digital pass-through enabled");
923 pa_stream_set_latency_update_callback(s, NULL, NULL);
928 const struct pa_buffer_attr *pba = pa_stream_get_buffer_attr(s);
929 msg_Dbg(aout, "using buffer metrics: maxlength=%u, tlength=%u, "
930 "prebuf=%u, minreq=%u",
931 pba->maxlength, pba->tlength, pba->prebuf, pba->minreq);
933 var_Create(aout, "audio-device", VLC_VAR_INTEGER|VLC_VAR_HASCHOICE);
934 var_Change(aout, "audio-device", VLC_VAR_SETTEXT,
935 &(vlc_value_t){ .psz_string = (char *)_("Audio device") },
937 var_AddCallback (aout, "audio-device", StreamMove, s);
938 op = pa_context_get_sink_info_list(ctx, sink_list_cb, aout);
939 /* We may need to wait for completion... once LibVLC supports this */
941 pa_operation_unref(op);
942 stream_moved_cb(s, aout);
945 aout->format.i_format = format;
946 aout->pf_play = Play;
947 aout->pf_pause = Pause;
948 aout->pf_flush = Flush;
949 aout_VolumeHardInit (aout, VolumeSet);
959 * Removes a PulseAudio playback stream
961 static void Close (vlc_object_t *obj)
963 audio_output_t *aout = (audio_output_t *)obj;
964 aout_sys_t *sys = aout->sys;
965 pa_context *ctx = sys->context;
966 pa_stream *s = sys->stream;
969 /* The callback takes mainloop lock, so it CANNOT be held here! */
970 var_DelCallback (aout, "audio-device", StreamMove, s);
971 var_Destroy (aout, "audio-device");
974 if (unlikely(sys->trigger != NULL))
975 vlc_pa_rttime_free(sys->trigger);
976 pa_stream_disconnect(s);
978 /* Clear all callbacks */
979 pa_stream_set_state_callback(s, NULL, NULL);
980 pa_stream_set_event_callback(s, NULL, NULL);
981 pa_stream_set_latency_update_callback(s, NULL, NULL);
982 pa_stream_set_moved_callback(s, NULL, NULL);
983 pa_stream_set_overflow_callback(s, NULL, NULL);
984 pa_stream_set_started_callback(s, NULL, NULL);
985 pa_stream_set_suspended_callback(s, NULL, NULL);
986 pa_stream_set_underflow_callback(s, NULL, NULL);
992 vlc_pa_disconnect(obj, ctx);