1 /*****************************************************************************
2 * pulse.c : Pulseaudio output plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2008 the VideoLAN team
6 * Authors: Martin Hamrle <hamrle @ post . cz>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
23 /*****************************************************************************
25 *****************************************************************************/
30 #include <vlc_common.h>
31 #include <vlc_plugin.h>
36 #include <pulse/pulseaudio.h>
37 #ifdef X_DISPLAY_MISSING
38 # error Xlib required due to PulseAudio bug 799!
44 /*****************************************************************************
45 * aout_sys_t: Pulseaudio output method descriptor
46 *****************************************************************************
47 * This structure is part of the audio output thread descriptor.
48 * It describes the specific properties of an audio device.
49 *****************************************************************************/
52 /** PulseAudio playback stream object */
53 struct pa_stream *stream;
55 /** PulseAudio connection context */
56 struct pa_context *context;
58 /** Main event loop object */
59 struct pa_threaded_mainloop *mainloop;
67 #define PULSE_DEBUG( ...) \
68 msg_Dbg( p_aout, __VA_ARGS__ )
70 #define PULSE_DEBUG( ...) \
75 #define CHECK_DEAD_GOTO(label) do { \
76 if (!p_sys->context || pa_context_get_state(p_sys->context) != PA_CONTEXT_READY || \
77 !p_sys->stream || pa_stream_get_state(p_sys->stream) != PA_STREAM_READY) { \
78 msg_Err(p_aout, "Connection died: %s", p_sys->context ? pa_strerror(pa_context_errno(p_sys->context)) : "NULL"); \
83 /*****************************************************************************
85 *****************************************************************************/
86 static int Open ( vlc_object_t * );
87 static void Close ( vlc_object_t * );
88 static void Play ( aout_instance_t * );
90 static void context_state_cb(pa_context *c, void *userdata);
91 static void stream_state_cb(pa_stream *s, void * userdata);
92 static void stream_request_cb(pa_stream *s, size_t length, void *userdata);
93 static void stream_latency_update_cb(pa_stream *s, void *userdata);
94 static void success_cb(pa_stream *s, int sucess, void *userdata);
95 static void uninit(aout_instance_t *p_aout);
97 /*****************************************************************************
99 *****************************************************************************/
101 set_shortname( "PulseAudio" )
102 set_description( N_("Pulseaudio audio output") )
103 set_capability( "audio output", 160 )
104 set_category( CAT_AUDIO )
105 set_subcategory( SUBCAT_AUDIO_AOUT )
106 add_shortcut( "pulseaudio" )
108 set_callbacks( Open, Close )
111 /*****************************************************************************
112 * Open: open the audio device
113 *****************************************************************************/
114 static int Open ( vlc_object_t *p_this )
116 aout_instance_t *p_aout = (aout_instance_t *)p_this;
117 struct aout_sys_t * p_sys;
118 struct pa_sample_spec ss;
119 const struct pa_buffer_attr *buffer_attr;
120 struct pa_buffer_attr a;
121 struct pa_channel_map map;
122 char * p_client_name = NULL;
124 if( !vlc_xlib_init( p_this ) )
127 /* Allocate structures */
128 p_aout->output.p_sys = p_sys = calloc( 1, sizeof( aout_sys_t ) );
132 PULSE_DEBUG( "Pulse start initialization");
134 ss.channels = aout_FormatNbChannels( &p_aout->output.output ); /* Get the input stream channel count */
136 /* Setup the pulse audio stream based on the input stream count */
140 p_aout->output.output.i_physical_channels
141 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
142 | AOUT_CHAN_MIDDLELEFT | AOUT_CHAN_MIDDLERIGHT
143 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
147 p_aout->output.output.i_physical_channels
148 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT | AOUT_CHAN_CENTER
149 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
154 p_aout->output.output.i_physical_channels
155 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
156 | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
160 p_aout->output.output.i_physical_channels
161 = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
165 p_aout->output.output.i_physical_channels = AOUT_CHAN_CENTER;
169 msg_Err(p_aout,"Invalid number of channels");
173 /* Add a quick command line info message */
174 msg_Dbg(p_aout, "%d audio channels", ss.channels);
176 ss.rate = p_aout->output.output.i_rate;
179 ss.format = PA_SAMPLE_FLOAT32NE;
180 p_aout->output.output.i_format = VLC_CODEC_FL32;
184 ss.format = PA_SAMPLE_S16NE;
185 p_aout->output.output.i_format = VLC_CODEC_S16N;
188 if (!pa_sample_spec_valid(&ss)) {
189 msg_Err(p_aout,"Invalid sample spec");
193 /* Reduce overall latency to 200mS to reduce audible clicks
194 * Also pulse minreq and internal buffers are now 20mS which reduces resampling
196 a.tlength = pa_bytes_per_second(&ss)/5;
197 a.maxlength = a.tlength * 2;
198 a.prebuf = a.tlength / 2;
199 a.minreq = a.tlength / 10;
201 /* Buffer size is 20mS */
202 p_sys->buffer_size = a.minreq;
204 /* Initialise the speaker map setup above */
205 pa_channel_map_init_auto(&map, ss.channels, PA_CHANNEL_MAP_ALSA);
207 if (!(p_sys->mainloop = pa_threaded_mainloop_new())) {
208 msg_Err(p_aout, "Failed to allocate main loop");
212 if ((p_client_name = var_InheritString(p_aout, "user-agent")) == NULL) {
213 msg_Err(p_aout, "No user-agent string available.");
217 if (!(p_sys->context = pa_context_new(pa_threaded_mainloop_get_api(p_sys->mainloop), p_client_name))) {
218 msg_Err(p_aout, "Failed to allocate context");
222 pa_context_set_state_callback(p_sys->context, context_state_cb, p_aout);
224 PULSE_DEBUG( "Pulse before context connect");
226 if (pa_context_connect(p_sys->context, NULL, 0, NULL) < 0) {
227 msg_Err(p_aout, "Failed to connect to server: %s", pa_strerror(pa_context_errno(p_sys->context)));
231 PULSE_DEBUG( "Pulse after context connect");
233 pa_threaded_mainloop_lock(p_sys->mainloop);
235 if (pa_threaded_mainloop_start(p_sys->mainloop) < 0) {
236 msg_Err(p_aout, "Failed to start main loop");
237 goto unlock_and_fail;
240 msg_Dbg(p_aout, "Pulse mainloop started");
242 /* Wait until the context is ready */
243 pa_threaded_mainloop_wait(p_sys->mainloop);
245 if (pa_context_get_state(p_sys->context) != PA_CONTEXT_READY) {
246 msg_Dbg(p_aout, "Failed to connect to server: %s", pa_strerror(pa_context_errno(p_sys->context)));
247 goto unlock_and_fail;
250 if (!(p_sys->stream = pa_stream_new(p_sys->context, "audio stream", &ss, &map))) {
251 msg_Err(p_aout, "Failed to create stream: %s", pa_strerror(pa_context_errno(p_sys->context)));
252 goto unlock_and_fail;
255 PULSE_DEBUG( "Pulse after new stream");
257 pa_stream_set_state_callback(p_sys->stream, stream_state_cb, p_aout);
258 pa_stream_set_write_callback(p_sys->stream, stream_request_cb, p_aout);
259 pa_stream_set_latency_update_callback(p_sys->stream, stream_latency_update_cb, p_aout);
261 if (pa_stream_connect_playback(p_sys->stream, NULL, &a, PA_STREAM_INTERPOLATE_TIMING|PA_STREAM_AUTO_TIMING_UPDATE|PA_STREAM_ADJUST_LATENCY, NULL, NULL) < 0) {
262 msg_Err(p_aout, "Failed to connect stream: %s", pa_strerror(pa_context_errno(p_sys->context)));
263 goto unlock_and_fail;
266 PULSE_DEBUG("Pulse stream connect");
268 /* Wait until the stream is ready */
269 pa_threaded_mainloop_wait(p_sys->mainloop);
271 msg_Dbg(p_aout,"Pulse stream connected");
273 if (pa_stream_get_state(p_sys->stream) != PA_STREAM_READY) {
274 msg_Err(p_aout, "Failed to connect to server: %s", pa_strerror(pa_context_errno(p_sys->context)));
275 goto unlock_and_fail;
279 PULSE_DEBUG("Pulse after stream get status");
281 pa_threaded_mainloop_unlock(p_sys->mainloop);
283 buffer_attr = pa_stream_get_buffer_attr(p_sys->stream);
284 p_aout->output.i_nb_samples = buffer_attr->minreq / pa_frame_size(&ss);
285 p_aout->output.pf_play = Play;
286 aout_VolumeSoftInit(p_aout);
287 msg_Dbg(p_aout, "Pulse initialized successfully");
289 char cmt[PA_CHANNEL_MAP_SNPRINT_MAX], sst[PA_SAMPLE_SPEC_SNPRINT_MAX];
291 msg_Dbg(p_aout, "Buffer metrics: maxlength=%u, tlength=%u, prebuf=%u, minreq=%u", buffer_attr->maxlength, buffer_attr->tlength, buffer_attr->prebuf, buffer_attr->minreq);
292 msg_Dbg(p_aout, "Using sample spec '%s', channel map '%s'.",
293 pa_sample_spec_snprint(sst, sizeof(sst), pa_stream_get_sample_spec(p_sys->stream)),
294 pa_channel_map_snprint(cmt, sizeof(cmt), pa_stream_get_channel_map(p_sys->stream)));
296 msg_Dbg(p_aout, "Connected to device %s (%u, %ssuspended).",
297 pa_stream_get_device_name(p_sys->stream),
298 pa_stream_get_device_index(p_sys->stream),
299 pa_stream_is_suspended(p_sys->stream) ? "" : "not ");
305 msg_Dbg(p_aout, "Pulse initialization unlock and fail");
308 pa_threaded_mainloop_unlock(p_sys->mainloop);
312 msg_Dbg(p_aout, "Pulse initialization failed");
317 /*****************************************************************************
318 * Play: play a sound samples buffer
319 *****************************************************************************/
320 static void Play( aout_instance_t * p_aout )
322 struct aout_sys_t * p_sys = (struct aout_sys_t *) p_aout->output.p_sys;
327 msg_Dbg(p_aout, "Pulse stream started");
329 aout_FifoFirstDate( p_aout, &p_aout->output.fifo );
332 pa_threaded_mainloop_lock(p_sys->mainloop);
333 if((o = pa_stream_flush(p_sys->stream, success_cb, p_aout))){
334 pa_operation_unref(o);
336 pa_threaded_mainloop_unlock(p_sys->mainloop);
338 pa_threaded_mainloop_signal(p_sys->mainloop, 0);
342 /*****************************************************************************
343 * Close: close the audio device
344 *****************************************************************************/
345 static void Close ( vlc_object_t *p_this )
347 aout_instance_t *p_aout = (aout_instance_t *)p_this;
348 struct aout_sys_t * p_sys = p_aout->output.p_sys;
350 msg_Dbg(p_aout, "Pulse Close");
353 pa_threaded_mainloop_lock(p_sys->mainloop);
354 pa_stream_set_write_callback(p_sys->stream, NULL, NULL);
356 /* I didn't find any explanation why we need to do pa_stream_drain on close
357 * as we don't really care if we lose 20ms buffer in this point anyway?
358 * And disabling this speeds up closing pulseaudio quite a lot (atleast for me).
361 pa_operation *o = pa_stream_drain(p_sys->stream, success_cb, p_aout);
363 while (pa_operation_get_state(o) != PA_OPERATION_DONE) {
364 CHECK_DEAD_GOTO(fail);
365 pa_threaded_mainloop_wait(p_sys->mainloop);
370 pa_operation_unref(o);
373 pa_threaded_mainloop_unlock(p_sys->mainloop);
378 static void uninit(aout_instance_t *p_aout){
379 struct aout_sys_t * p_sys = p_aout->output.p_sys;
382 pa_threaded_mainloop_stop(p_sys->mainloop);
385 pa_stream_disconnect(p_sys->stream);
386 pa_stream_unref(p_sys->stream);
387 p_sys->stream = NULL;
390 if (p_sys->context) {
391 pa_context_disconnect(p_sys->context);
392 pa_context_unref(p_sys->context);
393 p_sys->context = NULL;
396 if (p_sys->mainloop) {
397 pa_threaded_mainloop_free(p_sys->mainloop);
398 p_sys->mainloop = NULL;
402 p_aout->output.p_sys = NULL;
405 static void context_state_cb(pa_context *c, void *userdata) {
406 aout_instance_t *p_aout = (aout_instance_t *)userdata;
407 struct aout_sys_t * p_sys = (struct aout_sys_t *) p_aout->output.p_sys;
411 PULSE_DEBUG( "Pulse context state changed");
413 switch (pa_context_get_state(c)) {
414 case PA_CONTEXT_READY:
415 case PA_CONTEXT_TERMINATED:
416 case PA_CONTEXT_FAILED:
417 PULSE_DEBUG( "Pulse context state changed signal");
418 pa_threaded_mainloop_signal(p_sys->mainloop, 0);
421 case PA_CONTEXT_UNCONNECTED:
422 case PA_CONTEXT_CONNECTING:
423 case PA_CONTEXT_AUTHORIZING:
424 case PA_CONTEXT_SETTING_NAME:
425 PULSE_DEBUG( "Pulse context state changed no signal");
430 static void stream_state_cb(pa_stream *s, void * userdata) {
431 aout_instance_t *p_aout = (aout_instance_t *)userdata;
432 struct aout_sys_t * p_sys = (struct aout_sys_t *) p_aout->output.p_sys;
436 PULSE_DEBUG( "Pulse stream state changed");
438 switch (pa_stream_get_state(s)) {
440 case PA_STREAM_READY:
441 case PA_STREAM_FAILED:
442 case PA_STREAM_TERMINATED:
443 pa_threaded_mainloop_signal(p_sys->mainloop, 0);
446 case PA_STREAM_UNCONNECTED:
447 case PA_STREAM_CREATING:
452 static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
454 aout_instance_t *p_aout = (aout_instance_t *)userdata;
455 struct aout_sys_t * p_sys = (struct aout_sys_t *) p_aout->output.p_sys;
461 size_t buffer_size = p_sys->buffer_size;
463 PULSE_DEBUG( "Pulse stream request %d", length);
466 aout_buffer_t * p_buffer = NULL;
470 if(pa_stream_get_latency(p_sys->stream, &latency, &negative)<0){
471 if (pa_context_errno(p_sys->context) != PA_ERR_NODATA) {
472 msg_Err(p_aout, "pa_stream_get_latency() failed: %s", pa_strerror(pa_context_errno(p_sys->context)));
478 PULSE_DEBUG( "Pulse stream request latency=%"PRId64"", latency);
479 next_date = mdate() + latency;
481 if(p_sys->start_date < next_date + AOUT_PTS_TOLERANCE ){
482 p_buffer = aout_OutputNextBuffer( p_aout, next_date, 0);
486 if ( p_buffer != NULL )
488 PULSE_DEBUG( "Pulse stream request write buffer %d", p_buffer->i_buffer);
489 pa_stream_write(p_sys->stream, p_buffer->p_buffer, p_buffer->i_buffer, NULL, 0, PA_SEEK_RELATIVE);
490 length -= p_buffer->i_buffer;
491 aout_BufferFree( p_buffer );
495 PULSE_DEBUG( "Pulse stream request write zeroes");
496 void *data = pa_xmalloc(buffer_size);
497 bzero(data, buffer_size);
498 pa_stream_write(p_sys->stream, data, buffer_size, pa_xfree, 0, PA_SEEK_RELATIVE);
499 length -= buffer_size;
501 }while(length > buffer_size);
503 pa_threaded_mainloop_signal(p_sys->mainloop, 0);
506 static void stream_latency_update_cb(pa_stream *s, void *userdata) {
508 aout_instance_t *p_aout = (aout_instance_t *)userdata;
509 struct aout_sys_t * p_sys = (struct aout_sys_t *) p_aout->output.p_sys;
513 PULSE_DEBUG( "Pulse stream latency update");
515 pa_threaded_mainloop_signal(p_sys->mainloop, 0);
518 static void success_cb(pa_stream *s, int sucess, void *userdata)
521 aout_instance_t *p_aout = (aout_instance_t *)userdata;
522 struct aout_sys_t * p_sys = (struct aout_sys_t *) p_aout->output.p_sys;
528 pa_threaded_mainloop_signal(p_sys->mainloop, 0);