4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
7 Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
9 PulseAudio is free software; you can redistribute it and/or modify
10 it under the terms of the GNU Lesser General Public License as published
11 by the Free Software Foundation; either version 2 of the License,
12 or (at your option) any later version.
14 PulseAudio is distributed in the hope that it will be useful, but
15 WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 General Public License for more details.
19 You should have received a copy of the GNU Lesser General Public License
20 along with PulseAudio; if not, write to the Free Software
21 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
31 #include <asoundlib.h>
33 #include <pulse/xmalloc.h>
34 #include <pulse/util.h>
36 #include <pulsecore/core.h>
37 #include <pulsecore/module.h>
38 #include <pulsecore/memchunk.h>
39 #include <pulsecore/sink.h>
40 #include <pulsecore/modargs.h>
41 #include <pulsecore/core-util.h>
42 #include <pulsecore/sample-util.h>
43 #include <pulsecore/log.h>
44 #include <pulsecore/macro.h>
45 #include <pulsecore/thread.h>
46 #include <pulsecore/core-error.h>
47 #include <pulsecore/thread-mq.h>
48 #include <pulsecore/rtpoll.h>
50 #include "alsa-util.h"
51 #include "module-alsa-sink-symdef.h"
53 PA_MODULE_AUTHOR("Lennart Poettering")
54 PA_MODULE_DESCRIPTION("ALSA Sink")
55 PA_MODULE_VERSION(PACKAGE_VERSION
)
57 "sink_name=<name for the sink> "
58 "device=<ALSA device> "
59 "format=<sample format> "
60 "channels=<number of channels> "
62 "fragments=<number of fragments> "
63 "fragment_size=<fragment size> "
64 "channel_map=<channel map> "
65 "mmap=<enable memory mapping?>")
67 #define DEFAULT_DEVICE "default"
75 pa_thread_mq thread_mq
;
78 snd_pcm_t
*pcm_handle
;
80 pa_alsa_fdlist
*mixer_fdl
;
81 snd_mixer_t
*mixer_handle
;
82 snd_mixer_elem_t
*mixer_elem
;
83 long hw_volume_max
, hw_volume_min
;
85 size_t frame_size
, fragment_size
, hwbuf_size
;
95 pa_rtpoll_item
*alsa_rtpoll_item
;
98 static const char* const valid_modargs
[] = {
111 static int mmap_write(struct userdata
*u
) {
115 pa_sink_assert_ref(u
->sink
);
122 const snd_pcm_channel_area_t
*areas
;
123 snd_pcm_uframes_t offset
, frames
;
125 if ((n
= snd_pcm_avail_update(u
->pcm_handle
)) < 0) {
128 pa_log_debug("snd_pcm_avail_update: Buffer underrun!");
132 if ((err
= snd_pcm_recover(u
->pcm_handle
, n
, 1)) == 0)
138 pa_log("snd_pcm_avail_update: %s", snd_strerror(err
));
142 /* pa_log("Got request for %i samples", (int) n); */
149 if ((err
= snd_pcm_mmap_begin(u
->pcm_handle
, &areas
, &offset
, &frames
)) < 0) {
152 pa_log_debug("snd_pcm_mmap_begin: Buffer underrun!");
156 if ((err
= snd_pcm_recover(u
->pcm_handle
, err
, 1)) == 0)
162 pa_log("Failed to write data to DSP: %s", snd_strerror(err
));
166 /* Check these are multiples of 8 bit */
167 pa_assert((areas
[0].first
& 7) == 0);
168 pa_assert((areas
[0].step
& 7)== 0);
170 /* We assume a single interleaved memory buffer */
171 pa_assert((areas
[0].first
>> 3) == 0);
172 pa_assert((areas
[0].step
>> 3) == u
->frame_size
);
174 p
= (uint8_t*) areas
[0].addr
+ (offset
* u
->frame_size
);
176 chunk
.memblock
= pa_memblock_new_fixed(u
->core
->mempool
, p
, frames
* u
->frame_size
, 1);
177 chunk
.length
= pa_memblock_get_length(chunk
.memblock
);
180 pa_sink_render_into_full(u
->sink
, &chunk
);
182 /* FIXME: Maybe we can do something to keep this memory block
183 * a little bit longer around? */
184 pa_memblock_unref_fixed(chunk
.memblock
);
186 if ((err
= snd_pcm_mmap_commit(u
->pcm_handle
, offset
, frames
)) < 0) {
189 pa_log_debug("snd_pcm_mmap_commit: Buffer underrun!");
193 if ((err
= snd_pcm_recover(u
->pcm_handle
, err
, 1)) == 0)
199 pa_log("Failed to write data to DSP: %s", snd_strerror(err
));
205 if (frames
>= (snd_pcm_uframes_t
) n
)
208 /* pa_log("wrote %i samples", (int) frames); */
212 static int unix_write(struct userdata
*u
) {
213 snd_pcm_status_t
*status
;
216 snd_pcm_status_alloca(&status
);
219 pa_sink_assert_ref(u
->sink
);
227 if ((err
= snd_pcm_status(u
->pcm_handle
, status
)) < 0) {
228 pa_log("Failed to query DSP status data: %s", snd_strerror(err
));
232 if (snd_pcm_status_get_avail_max(status
)*u
->frame_size
>= u
->hwbuf_size
)
233 pa_log_debug("Buffer underrun!");
235 l
= snd_pcm_status_get_avail(status
) * u
->frame_size
;
237 /* pa_log("%u bytes to write", l); */
242 if (u
->memchunk
.length
<= 0)
243 pa_sink_render(u
->sink
, l
, &u
->memchunk
);
245 pa_assert(u
->memchunk
.length
> 0);
247 p
= pa_memblock_acquire(u
->memchunk
.memblock
);
248 t
= snd_pcm_writei(u
->pcm_handle
, (const uint8_t*) p
+ u
->memchunk
.index
, u
->memchunk
.length
/ u
->frame_size
);
249 pa_memblock_release(u
->memchunk
.memblock
);
251 /* pa_log("wrote %i bytes of %u (%u)", t*u->frame_size, u->memchunk.length, l); */
257 if ((t
= snd_pcm_recover(u
->pcm_handle
, t
, 1)) == 0)
261 pa_log_debug("EAGAIN");
264 pa_log("Failed to write data to DSP: %s", snd_strerror(t
));
269 u
->memchunk
.index
+= t
* u
->frame_size
;
270 u
->memchunk
.length
-= t
* u
->frame_size
;
272 if (u
->memchunk
.length
<= 0) {
273 pa_memblock_unref(u
->memchunk
.memblock
);
274 pa_memchunk_reset(&u
->memchunk
);
279 if (t
* u
->frame_size
>= (unsigned) l
)
284 static pa_usec_t
sink_get_latency(struct userdata
*u
) {
286 snd_pcm_status_t
*status
;
287 snd_pcm_sframes_t frames
= 0;
290 snd_pcm_status_alloca(&status
);
293 pa_assert(u
->pcm_handle
);
295 if ((err
= snd_pcm_status(u
->pcm_handle
, status
)) < 0)
296 pa_log("Failed to get delay: %s", snd_strerror(err
));
298 frames
= snd_pcm_status_get_delay(status
);
301 r
= pa_bytes_to_usec(frames
* u
->frame_size
, &u
->sink
->sample_spec
);
303 if (u
->memchunk
.memblock
)
304 r
+= pa_bytes_to_usec(u
->memchunk
.length
, &u
->sink
->sample_spec
);
309 static int build_pollfd(struct userdata
*u
) {
311 struct pollfd
*pollfd
;
315 pa_assert(u
->pcm_handle
);
317 if ((n
= snd_pcm_poll_descriptors_count(u
->pcm_handle
)) < 0) {
318 pa_log("snd_pcm_poll_descriptors_count() failed: %s", snd_strerror(n
));
322 if (u
->alsa_rtpoll_item
)
323 pa_rtpoll_item_free(u
->alsa_rtpoll_item
);
325 u
->alsa_rtpoll_item
= pa_rtpoll_item_new(u
->rtpoll
, PA_RTPOLL_NEVER
, n
);
326 pollfd
= pa_rtpoll_item_get_pollfd(u
->alsa_rtpoll_item
, NULL
);
328 if ((err
= snd_pcm_poll_descriptors(u
->pcm_handle
, pollfd
, n
)) < 0) {
329 pa_log("snd_pcm_poll_descriptors() failed: %s", snd_strerror(err
));
336 static int suspend(struct userdata
*u
) {
338 pa_assert(u
->pcm_handle
);
341 snd_pcm_drain(u
->pcm_handle
);
342 snd_pcm_close(u
->pcm_handle
);
343 u
->pcm_handle
= NULL
;
345 if (u
->alsa_rtpoll_item
) {
346 pa_rtpoll_item_free(u
->alsa_rtpoll_item
);
347 u
->alsa_rtpoll_item
= NULL
;
350 pa_log_info("Device suspended...");
355 static int unsuspend(struct userdata
*u
) {
359 snd_pcm_uframes_t period_size
;
362 pa_assert(!u
->pcm_handle
);
364 pa_log_info("Trying resume...");
366 snd_config_update_free_global();
367 if ((err
= snd_pcm_open(&u
->pcm_handle
, u
->device_name
, SND_PCM_STREAM_PLAYBACK
, SND_PCM_NONBLOCK
)) < 0) {
368 pa_log("Error opening PCM device %s: %s", u
->device_name
, snd_strerror(err
));
372 ss
= u
->sink
->sample_spec
;
373 nfrags
= u
->nfragments
;
374 period_size
= u
->fragment_size
/ u
->frame_size
;
377 if ((err
= pa_alsa_set_hw_params(u
->pcm_handle
, &ss
, &nfrags
, &period_size
, &b
)) < 0) {
378 pa_log("Failed to set hardware parameters: %s", snd_strerror(err
));
382 if (b
!= u
->use_mmap
) {
383 pa_log_warn("Resume failed, couldn't get original access mode.");
387 if (!pa_sample_spec_equal(&ss
, &u
->sink
->sample_spec
)) {
388 pa_log_warn("Resume failed, couldn't restore original sample settings.");
392 if (nfrags
!= u
->nfragments
|| period_size
*u
->frame_size
!= u
->fragment_size
) {
393 pa_log_warn("Resume failed, couldn't restore original fragment settings.");
397 if ((err
= pa_alsa_set_sw_params(u
->pcm_handle
)) < 0) {
398 pa_log("Failed to set software parameters: %s", snd_strerror(err
));
402 if (build_pollfd(u
) < 0)
405 /* FIXME: We need to reload the volume somehow */
409 pa_log_info("Resumed successfully...");
415 snd_pcm_close(u
->pcm_handle
);
416 u
->pcm_handle
= NULL
;
422 static int sink_process_msg(pa_msgobject
*o
, int code
, void *data
, int64_t offset
, pa_memchunk
*chunk
) {
423 struct userdata
*u
= PA_SINK(o
)->userdata
;
427 case PA_SINK_MESSAGE_GET_LATENCY
: {
431 r
= sink_get_latency(u
);
433 *((pa_usec_t
*) data
) = r
;
438 case PA_SINK_MESSAGE_SET_STATE
:
440 switch ((pa_sink_state_t
) PA_PTR_TO_UINT(data
)) {
442 case PA_SINK_SUSPENDED
:
443 pa_assert(PA_SINK_OPENED(u
->sink
->thread_info
.state
));
451 case PA_SINK_RUNNING
:
453 if (u
->sink
->thread_info
.state
== PA_SINK_INIT
) {
454 if (build_pollfd(u
) < 0)
458 if (u
->sink
->thread_info
.state
== PA_SINK_SUSPENDED
) {
459 if (unsuspend(u
) < 0)
465 case PA_SINK_UNLINKED
:
473 return pa_sink_process_msg(o
, code
, data
, offset
, chunk
);
476 static int mixer_callback(snd_mixer_elem_t
*elem
, unsigned int mask
) {
477 struct userdata
*u
= snd_mixer_elem_get_callback_private(elem
);
480 pa_assert(u
->mixer_handle
);
482 if (mask
== SND_CTL_EVENT_MASK_REMOVE
)
485 if (mask
& SND_CTL_EVENT_MASK_VALUE
) {
486 pa_sink_get_volume(u
->sink
);
487 pa_sink_get_mute(u
->sink
);
493 static int sink_get_volume_cb(pa_sink
*s
) {
494 struct userdata
*u
= s
->userdata
;
499 pa_assert(u
->mixer_elem
);
501 for (i
= 0; i
< s
->sample_spec
.channels
; i
++) {
504 pa_assert(snd_mixer_selem_has_playback_channel(u
->mixer_elem
, i
));
506 if ((err
= snd_mixer_selem_get_playback_volume(u
->mixer_elem
, i
, &vol
)) < 0)
509 set_vol
= (long) roundf(((float) s
->volume
.values
[i
] * (u
->hw_volume_max
- u
->hw_volume_min
)) / PA_VOLUME_NORM
) + u
->hw_volume_min
;
511 /* Try to avoid superfluous volume changes */
513 s
->volume
.values
[i
] = (pa_volume_t
) roundf(((float) (vol
- u
->hw_volume_min
) * PA_VOLUME_NORM
) / (u
->hw_volume_max
- u
->hw_volume_min
));
519 pa_log_error("Unable to read volume: %s", snd_strerror(err
));
521 s
->get_volume
= NULL
;
522 s
->set_volume
= NULL
;
526 static int sink_set_volume_cb(pa_sink
*s
) {
527 struct userdata
*u
= s
->userdata
;
532 pa_assert(u
->mixer_elem
);
534 for (i
= 0; i
< s
->sample_spec
.channels
; i
++) {
538 pa_assert(snd_mixer_selem_has_playback_channel(u
->mixer_elem
, i
));
540 vol
= s
->volume
.values
[i
];
542 if (vol
> PA_VOLUME_NORM
)
543 vol
= PA_VOLUME_NORM
;
545 alsa_vol
= (long) roundf(((float) vol
* (u
->hw_volume_max
- u
->hw_volume_min
)) / PA_VOLUME_NORM
) + u
->hw_volume_min
;
547 if ((err
= snd_mixer_selem_set_playback_volume(u
->mixer_elem
, i
, alsa_vol
)) < 0)
554 pa_log_error("Unable to set volume: %s", snd_strerror(err
));
556 s
->get_volume
= NULL
;
557 s
->set_volume
= NULL
;
561 static int sink_get_mute_cb(pa_sink
*s
) {
562 struct userdata
*u
= s
->userdata
;
566 pa_assert(u
->mixer_elem
);
568 if ((err
= snd_mixer_selem_get_playback_switch(u
->mixer_elem
, 0, &sw
)) < 0) {
569 pa_log_error("Unable to get switch: %s", snd_strerror(err
));
581 static int sink_set_mute_cb(pa_sink
*s
) {
582 struct userdata
*u
= s
->userdata
;
586 pa_assert(u
->mixer_elem
);
588 if ((err
= snd_mixer_selem_set_playback_switch_all(u
->mixer_elem
, !s
->muted
)) < 0) {
589 pa_log_error("Unable to set switch: %s", snd_strerror(err
));
599 static void thread_func(void *userdata
) {
600 struct userdata
*u
= userdata
;
604 pa_log_debug("Thread starting up");
606 if (u
->core
->high_priority
)
609 pa_thread_mq_install(&u
->thread_mq
);
610 pa_rtpoll_install(u
->rtpoll
);
615 /* Render some data and write it to the dsp */
616 if (PA_SINK_OPENED(u
->sink
->thread_info
.state
)) {
620 if ((work_done
= mmap_write(u
)) < 0)
623 if ((work_done
= unix_write(u
)) < 0)
627 if (work_done
&& u
->first
) {
628 pa_log_info("Starting playback.");
629 snd_pcm_start(u
->pcm_handle
);
635 /* Hmm, nothing to do. Let's sleep */
636 if ((ret
= pa_rtpoll_run(u
->rtpoll
, 1)) < 0)
642 /* Tell ALSA about this and process its response */
643 if (PA_SINK_OPENED(u
->sink
->thread_info
.state
)) {
644 struct pollfd
*pollfd
;
645 unsigned short revents
= 0;
649 pollfd
= pa_rtpoll_item_get_pollfd(u
->alsa_rtpoll_item
, &n
);
651 if ((err
= snd_pcm_poll_descriptors_revents(u
->pcm_handle
, pollfd
, n
, &revents
)) < 0) {
652 pa_log("snd_pcm_poll_descriptors_revents() failed: %s", snd_strerror(err
));
656 if (revents
& (POLLERR
|POLLNVAL
|POLLHUP
)) {
658 if (revents
& POLLERR
)
659 pa_log_warn("Got POLLERR from ALSA");
660 if (revents
& POLLNVAL
)
661 pa_log_warn("Got POLLNVAL from ALSA");
662 if (revents
& POLLHUP
)
663 pa_log_warn("Got POLLHUP from ALSA");
665 /* Try to recover from this error */
667 switch (snd_pcm_state(u
->pcm_handle
)) {
669 case SND_PCM_STATE_XRUN
:
670 if ((err
= snd_pcm_recover(u
->pcm_handle
, -EPIPE
, 1)) != 0) {
671 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and XRUN: %s", snd_strerror(err
));
676 case SND_PCM_STATE_SUSPENDED
:
677 if ((err
= snd_pcm_recover(u
->pcm_handle
, -ESTRPIPE
, 1)) != 0) {
678 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP and SUSPENDED: %s", snd_strerror(err
));
685 snd_pcm_drop(u
->pcm_handle
);
687 if ((err
= snd_pcm_prepare(u
->pcm_handle
)) < 0) {
688 pa_log_warn("Could not recover from POLLERR|POLLNVAL|POLLHUP with snd_pcm_prepare(): %s", snd_strerror(err
));
698 /* If this was no regular exit from the loop we have to continue
699 * processing messages until we received PA_MESSAGE_SHUTDOWN */
700 pa_asyncmsgq_post(u
->thread_mq
.outq
, PA_MSGOBJECT(u
->core
), PA_CORE_MESSAGE_UNLOAD_MODULE
, u
->module
, 0, NULL
, NULL
);
701 pa_asyncmsgq_wait_for(u
->thread_mq
.inq
, PA_MESSAGE_SHUTDOWN
);
704 pa_log_debug("Thread shutting down");
707 int pa__init(pa_module
*m
) {
709 pa_modargs
*ma
= NULL
;
710 struct userdata
*u
= NULL
;
714 uint32_t nfrags
, frag_size
;
715 snd_pcm_uframes_t period_size
;
717 snd_pcm_info_t
*pcm_info
= NULL
;
721 char *name_buf
= NULL
;
725 snd_pcm_info_alloca(&pcm_info
);
729 if (!(ma
= pa_modargs_new(m
->argument
, valid_modargs
))) {
730 pa_log("Failed to parse module arguments");
734 ss
= m
->core
->default_sample_spec
;
735 if (pa_modargs_get_sample_spec_and_channel_map(ma
, &ss
, &map
, PA_CHANNEL_MAP_ALSA
) < 0) {
736 pa_log("Failed to parse sample specification and channel map");
740 frame_size
= pa_frame_size(&ss
);
742 nfrags
= m
->core
->default_n_fragments
;
743 frag_size
= pa_usec_to_bytes(m
->core
->default_fragment_size_msec
*1000, &ss
);
745 frag_size
= frame_size
;
747 if (pa_modargs_get_value_u32(ma
, "fragments", &nfrags
) < 0 || pa_modargs_get_value_u32(ma
, "fragment_size", &frag_size
) < 0) {
748 pa_log("Failed to parse buffer metrics");
751 period_size
= frag_size
/frame_size
;
753 if (pa_modargs_get_value_boolean(ma
, "mmap", &use_mmap
) < 0) {
754 pa_log("Failed to parse mmap argument.");
758 u
= pa_xnew0(struct userdata
, 1);
762 u
->use_mmap
= use_mmap
;
764 pa_thread_mq_init(&u
->thread_mq
, m
->core
->mainloop
);
765 u
->rtpoll
= pa_rtpoll_new();
766 u
->alsa_rtpoll_item
= NULL
;
767 pa_rtpoll_item_new_asyncmsgq(u
->rtpoll
, PA_RTPOLL_EARLY
, u
->thread_mq
.inq
);
769 snd_config_update_free_global();
771 dev
= pa_xstrdup(pa_modargs_get_value(ma
, "device", DEFAULT_DEVICE
));
775 if ((err
= snd_pcm_open(&u
->pcm_handle
, dev
, SND_PCM_STREAM_PLAYBACK
, SND_PCM_NONBLOCK
)) < 0) {
776 pa_log("Error opening PCM device %s: %s", dev
, snd_strerror(err
));
782 if ((err
= pa_alsa_set_hw_params(u
->pcm_handle
, &ss
, &nfrags
, &period_size
, &b
)) < 0) {
785 /* Hmm, some hw is very exotic, so we retry with plughw, if hw didn't work */
787 if (pa_startswith(dev
, "hw:")) {
788 char *d
= pa_sprintf_malloc("plughw:%s", dev
+3);
789 pa_log_debug("Opening the device as '%s' didn't work, retrying with '%s'.", dev
, d
);
793 snd_pcm_close(u
->pcm_handle
);
794 u
->pcm_handle
= NULL
;
799 pa_log("Failed to set hardware parameters: %s", snd_strerror(err
));
807 u
->device_name
= dev
;
809 if (use_mmap
&& !b
) {
810 pa_log_info("Device doesn't support mmap(), falling back to UNIX read/write mode.");
811 u
->use_mmap
= use_mmap
= b
;
815 pa_log_info("Successfully enabled mmap() mode.");
817 if ((err
= snd_pcm_info(u
->pcm_handle
, pcm_info
)) < 0) {
818 pa_log("Error fetching PCM info: %s", snd_strerror(err
));
822 if ((err
= pa_alsa_set_sw_params(u
->pcm_handle
)) < 0) {
823 pa_log("Failed to set software parameters: %s", snd_strerror(err
));
827 /* ALSA might tweak the sample spec, so recalculate the frame size */
828 frame_size
= pa_frame_size(&ss
);
830 if (ss
.channels
!= map
.channels
)
831 /* Seems ALSA didn't like the channel number, so let's fix the channel map */
832 pa_channel_map_init_auto(&map
, ss
.channels
, PA_CHANNEL_MAP_ALSA
);
834 if ((err
= snd_mixer_open(&u
->mixer_handle
, 0)) < 0)
835 pa_log_warn("Error opening mixer: %s", snd_strerror(err
));
838 if ((pa_alsa_prepare_mixer(u
->mixer_handle
, dev
) < 0) ||
839 !(u
->mixer_elem
= pa_alsa_find_elem(u
->mixer_handle
, "Master", "PCM"))) {
841 snd_mixer_close(u
->mixer_handle
);
842 u
->mixer_handle
= NULL
;
846 if ((name
= pa_modargs_get_value(ma
, "sink_name", NULL
)))
849 name
= name_buf
= pa_sprintf_malloc("alsa_output.%s", dev
);
853 u
->sink
= pa_sink_new(m
->core
, __FILE__
, name
, namereg_fail
, &ss
, &map
);
857 pa_log("Failed to create sink object");
861 u
->sink
->parent
.process_msg
= sink_process_msg
;
862 u
->sink
->userdata
= u
;
864 pa_sink_set_module(u
->sink
, m
);
865 pa_sink_set_asyncmsgq(u
->sink
, u
->thread_mq
.inq
);
866 pa_sink_set_rtpoll(u
->sink
, u
->rtpoll
);
867 pa_sink_set_description(u
->sink
, t
= pa_sprintf_malloc(
868 "ALSA PCM on %s (%s)%s",
870 snd_pcm_info_get_name(pcm_info
),
871 use_mmap
? " via DMA" : ""));
874 u
->sink
->flags
= PA_SINK_HARDWARE
|PA_SINK_HW_VOLUME_CTRL
|PA_SINK_LATENCY
;
876 u
->frame_size
= frame_size
;
877 u
->fragment_size
= frag_size
= period_size
* frame_size
;
878 u
->nfragments
= nfrags
;
879 u
->hwbuf_size
= u
->fragment_size
* nfrags
;
881 pa_log_info("Using %u fragments of size %lu bytes.", nfrags
, (long unsigned) u
->fragment_size
);
883 pa_memchunk_reset(&u
->memchunk
);
885 if (u
->mixer_handle
) {
886 /* Initialize mixer code */
888 pa_assert(u
->mixer_elem
);
890 if (snd_mixer_selem_has_playback_volume(u
->mixer_elem
)) {
893 for (i
= 0; i
< ss
.channels
; i
++)
894 if (!snd_mixer_selem_has_playback_channel(u
->mixer_elem
, i
))
897 if (i
== ss
.channels
) {
898 pa_log_debug("ALSA device has separate volumes controls for all %u channels.", ss
.channels
);
899 u
->sink
->get_volume
= sink_get_volume_cb
;
900 u
->sink
->set_volume
= sink_set_volume_cb
;
901 snd_mixer_selem_get_playback_volume_range(u
->mixer_elem
, &u
->hw_volume_min
, &u
->hw_volume_max
);
903 pa_log_info("ALSA device lacks separate volumes controls for all %u channels (%u available), falling back to software volume control.", ss
.channels
, i
+1);
906 if (snd_mixer_selem_has_playback_switch(u
->mixer_elem
)) {
907 u
->sink
->get_mute
= sink_get_mute_cb
;
908 u
->sink
->set_mute
= sink_set_mute_cb
;
911 u
->mixer_fdl
= pa_alsa_fdlist_new();
913 if (pa_alsa_fdlist_set_mixer(u
->mixer_fdl
, u
->mixer_handle
, m
->core
->mainloop
) < 0) {
914 pa_log("failed to initialise file descriptor monitoring");
918 snd_mixer_elem_set_callback(u
->mixer_elem
, mixer_callback
);
919 snd_mixer_elem_set_callback_private(u
->mixer_elem
, u
);
923 if (!(u
->thread
= pa_thread_new(thread_func
, u
))) {
924 pa_log("Failed to create thread.");
928 /* Get initial mixer settings */
929 if (u
->sink
->get_volume
)
930 u
->sink
->get_volume(u
->sink
);
931 if (u
->sink
->get_mute
)
932 u
->sink
->get_mute(u
->sink
);
934 pa_sink_put(u
->sink
);
950 void pa__done(pa_module
*m
) {
955 if (!(u
= m
->userdata
))
959 pa_sink_unlink(u
->sink
);
962 pa_asyncmsgq_send(u
->thread_mq
.inq
, NULL
, PA_MESSAGE_SHUTDOWN
, NULL
, 0, NULL
);
963 pa_thread_free(u
->thread
);
966 pa_thread_mq_done(&u
->thread_mq
);
969 pa_sink_unref(u
->sink
);
971 if (u
->memchunk
.memblock
)
972 pa_memblock_unref(u
->memchunk
.memblock
);
974 if (u
->alsa_rtpoll_item
)
975 pa_rtpoll_item_free(u
->alsa_rtpoll_item
);
978 pa_rtpoll_free(u
->rtpoll
);
981 pa_alsa_fdlist_free(u
->mixer_fdl
);
984 snd_mixer_close(u
->mixer_handle
);
987 snd_pcm_drop(u
->pcm_handle
);
988 snd_pcm_close(u
->pcm_handle
);
991 pa_xfree(u
->device_name
);
994 snd_config_update_free_global();