summaryrefslogtreecommitdiff
path: root/src/modules/raop/module-raop-sink.c
blob: 2cb7a95eae88640940cec558d777f58ff4352d05 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
/***
  This file is part of PulseAudio.

  Copyright 2004-2006 Lennart Poettering
  Copyright 2008 Colin Guthrie

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2.1 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/ioctl.h>

#ifdef HAVE_LINUX_SOCKIOS_H
#include <linux/sockios.h>
#endif

#include <pulse/rtclock.h>
#include <pulse/timeval.h>
#include <pulse/xmalloc.h>

#include <pulsecore/core-error.h>
#include <pulsecore/sink.h>
#include <pulsecore/module.h>
#include <pulsecore/core-util.h>
#include <pulsecore/modargs.h>
#include <pulsecore/log.h>
#include <pulsecore/socket-client.h>
#include <pulsecore/thread-mq.h>
#include <pulsecore/thread.h>
#include <pulsecore/time-smoother.h>
#include <pulsecore/poll.h>

#include "module-raop-sink-symdef.h"
#include "rtp.h"
#include "sdp.h"
#include "sap.h"
#include "raop_client.h"

PA_MODULE_AUTHOR("Colin Guthrie");
PA_MODULE_DESCRIPTION("RAOP Sink");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(FALSE);
PA_MODULE_USAGE(
        "sink_name=<name for the sink> "
        "sink_properties=<properties for the sink> "
        "server=<address>  "
        "format=<sample format> "
        "rate=<sample rate> "
        "channels=<number of channels>");

#define DEFAULT_SINK_NAME "raop"

struct userdata {
    pa_core *core;
    pa_module *module;
    pa_sink *sink;

    pa_thread_mq thread_mq;
    pa_rtpoll *rtpoll;
    pa_rtpoll_item *rtpoll_item;
    pa_thread *thread;

    pa_memchunk raw_memchunk;
    pa_memchunk encoded_memchunk;

    void *write_data;
    size_t write_length, write_index;

    void *read_data;
    size_t read_length, read_index;

    pa_usec_t latency;

    /*esd_format_t format;*/
    int32_t rate;

    pa_smoother *smoother;
    int fd;

    int64_t offset;
    int64_t encoding_overhead;
    int32_t next_encoding_overhead;
    double encoding_ratio;

    pa_raop_client *raop;

    size_t block_size;
};

static const char* const valid_modargs[] = {
    "sink_name",
    "sink_properties",
    "server",
    "format",
    "rate",
    "channels",
    NULL
};

enum {
    SINK_MESSAGE_PASS_SOCKET = PA_SINK_MESSAGE_MAX,
    SINK_MESSAGE_RIP_SOCKET
};

/* Forward declaration */
static void sink_set_volume_cb(pa_sink *);

static void on_connection(int fd, void*userdata) {
    int so_sndbuf = 0;
    socklen_t sl = sizeof(int);
    struct userdata *u = userdata;
    pa_assert(u);

    pa_assert(u->fd < 0);
    u->fd = fd;

    if (getsockopt(u->fd, SOL_SOCKET, SO_SNDBUF, &so_sndbuf, &sl) < 0)
        pa_log_warn("getsockopt(SO_SNDBUF) failed: %s", pa_cstrerror(errno));
    else {
        pa_log_debug("SO_SNDBUF is %zu.", (size_t) so_sndbuf);
        pa_sink_set_max_request(u->sink, PA_MAX((size_t) so_sndbuf, u->block_size));
    }

    /* Set the initial volume */
    sink_set_volume_cb(u->sink);

    pa_log_debug("Connection authenticated, handing fd to IO thread...");

    pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_PASS_SOCKET, NULL, 0, NULL, NULL);
}

static void on_close(void*userdata) {
    struct userdata *u = userdata;
    pa_assert(u);

    pa_log_debug("Connection closed, informing IO thread...");

    pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_RIP_SOCKET, NULL, 0, NULL, NULL);
}

static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
    struct userdata *u = PA_SINK(o)->userdata;

    switch (code) {

        case PA_SINK_MESSAGE_SET_STATE:

            switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {

                case PA_SINK_SUSPENDED:
                    pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));

                    pa_smoother_pause(u->smoother, pa_rtclock_now());

                    /* Issue a FLUSH if we are connected */
                    if (u->fd >= 0) {
                        pa_raop_flush(u->raop);
                    }
                    break;

                case PA_SINK_IDLE:
                case PA_SINK_RUNNING:

                    if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {
                        pa_smoother_resume(u->smoother, pa_rtclock_now(), TRUE);

                        /* The connection can be closed when idle, so check to
                           see if we need to reestablish it */
                        if (u->fd < 0)
                            pa_raop_connect(u->raop);
                        else
                            pa_raop_flush(u->raop);
                    }

                    break;

                case PA_SINK_UNLINKED:
                case PA_SINK_INIT:
                case PA_SINK_INVALID_STATE:
                    ;
            }

            break;

        case PA_SINK_MESSAGE_GET_LATENCY: {
            pa_usec_t w, r;

            r = pa_smoother_get(u->smoother, pa_rtclock_now());
            w = pa_bytes_to_usec((u->offset - u->encoding_overhead + (u->encoded_memchunk.length / u->encoding_ratio)), &u->sink->sample_spec);

            *((pa_usec_t*) data) = w > r ? w - r : 0;
            return 0;
        }

        case SINK_MESSAGE_PASS_SOCKET: {
            struct pollfd *pollfd;

            pa_assert(!u->rtpoll_item);

            u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
            pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
            pollfd->fd = u->fd;
            pollfd->events = POLLOUT;
            /*pollfd->events = */pollfd->revents = 0;

            if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {
                /* Our stream has been suspended so we just flush it.... */
                pa_raop_flush(u->raop);
            }
            return 0;
        }

        case SINK_MESSAGE_RIP_SOCKET: {
            if (u->fd >= 0) {
                pa_close(u->fd);
                u->fd = -1;
            } else
                /* FIXME */
                pa_log("We should not get to this state. Cannot rip socket if not connected.");

            if (u->sink->thread_info.state == PA_SINK_SUSPENDED) {

                pa_log_debug("RTSP control connection closed, but we're suspended so let's not worry about it... we'll open it again later");

                if (u->rtpoll_item)
                    pa_rtpoll_item_free(u->rtpoll_item);
                u->rtpoll_item = NULL;
            } else {
                /* Question: is this valid here: or should we do some sort of:
                   return pa_sink_process_msg(PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL);
                   ?? */
                pa_module_unload_request(u->module, TRUE);
            }
            return 0;
        }
    }

    return pa_sink_process_msg(o, code, data, offset, chunk);
}

static void sink_set_volume_cb(pa_sink *s) {
    struct userdata *u = s->userdata;
    pa_cvolume hw;
    pa_volume_t v;
    char t[PA_CVOLUME_SNPRINT_MAX];

    pa_assert(u);

    /* If we're muted we don't need to do anything */
    if (s->muted)
        return;

    /* Calculate the max volume of all channels.
       We'll use this as our (single) volume on the APEX device and emulate
       any variation in channel volumes in software */
    v = pa_cvolume_max(&s->real_volume);

    /* Create a pa_cvolume version of our single value */
    pa_cvolume_set(&hw, s->sample_spec.channels, v);

    /* Perform any software manipulation of the volume needed */
    pa_sw_cvolume_divide(&s->soft_volume, &s->real_volume, &hw);

    pa_log_debug("Requested volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->real_volume));
    pa_log_debug("Got hardware volume: %s", pa_cvolume_snprint(t, sizeof(t), &hw));
    pa_log_debug("Calculated software volume: %s", pa_cvolume_snprint(t, sizeof(t), &s->soft_volume));

    /* Any necessary software volume manipulation is done so set
       our hw volume (or v as a single value) on the device */
    pa_raop_client_set_volume(u->raop, v);
}

static void sink_set_mute_cb(pa_sink *s) {
    struct userdata *u = s->userdata;

    pa_assert(u);

    if (s->muted) {
        pa_raop_client_set_volume(u->raop, PA_VOLUME_MUTED);
    } else {
        sink_set_volume_cb(s);
    }
}

static void thread_func(void *userdata) {
    struct userdata *u = userdata;
    int write_type = 0;
    pa_memchunk silence;
    uint32_t silence_overhead = 0;
    double silence_ratio = 0;

    pa_assert(u);

    pa_log_debug("Thread starting up");

    pa_thread_mq_install(&u->thread_mq);

    pa_smoother_set_time_offset(u->smoother, pa_rtclock_now());

    /* Create a chunk of memory that is our encoded silence sample. */
    pa_memchunk_reset(&silence);

    for (;;) {
        int ret;

        if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
            if (u->sink->thread_info.rewind_requested)
                pa_sink_process_rewind(u->sink, 0);

        if (u->rtpoll_item) {
            struct pollfd *pollfd;
            pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);

            /* Render some data and write it to the fifo */
            if (/*PA_SINK_IS_OPENED(u->sink->thread_info.state) && */pollfd->revents) {
                pa_usec_t usec;
                int64_t n;
                void *p;

                if (!silence.memblock) {
                    pa_memchunk silence_tmp;

                    pa_memchunk_reset(&silence_tmp);
                    silence_tmp.memblock = pa_memblock_new(u->core->mempool, 4096);
                    silence_tmp.length = 4096;
                    p = pa_memblock_acquire(silence_tmp.memblock);
                      memset(p, 0, 4096);
                    pa_memblock_release(silence_tmp.memblock);
                    pa_raop_client_encode_sample(u->raop, &silence_tmp, &silence);
                    pa_assert(0 == silence_tmp.length);
                    silence_overhead = silence_tmp.length - 4096;
                    silence_ratio = silence_tmp.length / 4096;
                    pa_memblock_unref(silence_tmp.memblock);
                }

                for (;;) {
                    ssize_t l;

                    if (u->encoded_memchunk.length <= 0) {
                        if (u->encoded_memchunk.memblock)
                            pa_memblock_unref(u->encoded_memchunk.memblock);
                        if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
                            size_t rl;

                            /* We render real data */
                            if (u->raw_memchunk.length <= 0) {
                                if (u->raw_memchunk.memblock)
                                    pa_memblock_unref(u->raw_memchunk.memblock);
                                pa_memchunk_reset(&u->raw_memchunk);

                                /* Grab unencoded data */
                                pa_sink_render(u->sink, u->block_size, &u->raw_memchunk);
                            }
                            pa_assert(u->raw_memchunk.length > 0);

                            /* Encode it */
                            rl = u->raw_memchunk.length;
                            u->encoding_overhead += u->next_encoding_overhead;
                            pa_raop_client_encode_sample(u->raop, &u->raw_memchunk, &u->encoded_memchunk);
                            u->next_encoding_overhead = (u->encoded_memchunk.length - (rl - u->raw_memchunk.length));
                            u->encoding_ratio = u->encoded_memchunk.length / (rl - u->raw_memchunk.length);
                        } else {
                            /* We render some silence into our memchunk */
                            memcpy(&u->encoded_memchunk, &silence, sizeof(pa_memchunk));
                            pa_memblock_ref(silence.memblock);

                            /* Calculate/store some values to be used with the smoother */
                            u->next_encoding_overhead = silence_overhead;
                            u->encoding_ratio = silence_ratio;
                        }
                    }
                    pa_assert(u->encoded_memchunk.length > 0);

                    p = pa_memblock_acquire(u->encoded_memchunk.memblock);
                    l = pa_write(u->fd, (uint8_t*) p + u->encoded_memchunk.index, u->encoded_memchunk.length, &write_type);
                    pa_memblock_release(u->encoded_memchunk.memblock);

                    pa_assert(l != 0);

                    if (l < 0) {

                        if (errno == EINTR)
                            continue;
                        else if (errno == EAGAIN) {

                            /* OK, we filled all socket buffers up
                             * now. */
                            goto filled_up;

                        } else {
                            pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
                            goto fail;
                        }

                    } else {
                        u->offset += l;

                        u->encoded_memchunk.index += l;
                        u->encoded_memchunk.length -= l;

                        pollfd->revents = 0;

                        if (u->encoded_memchunk.length > 0) {
                            /* we've completely written the encoded data, so update our overhead */
                            u->encoding_overhead += u->next_encoding_overhead;

                            /* OK, we wrote less that we asked for,
                             * hence we can assume that the socket
                             * buffers are full now */
                            goto filled_up;
                        }
                    }
                }

            filled_up:

                /* At this spot we know that the socket buffers are
                 * fully filled up. This is the best time to estimate
                 * the playback position of the server */

                n = u->offset - u->encoding_overhead;

#ifdef SIOCOUTQ
                {
                    int l;
                    if (ioctl(u->fd, SIOCOUTQ, &l) >= 0 && l > 0)
                        n -= (l / u->encoding_ratio);
                }
#endif

                usec = pa_bytes_to_usec(n, &u->sink->sample_spec);

                if (usec > u->latency)
                    usec -= u->latency;
                else
                    usec = 0;

                pa_smoother_put(u->smoother, pa_rtclock_now(), usec);
            }

            /* Hmm, nothing to do. Let's sleep */
            pollfd->events = POLLOUT; /*PA_SINK_IS_OPENED(u->sink->thread_info.state)  ? POLLOUT : 0;*/
        }

        if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
            goto fail;

        if (ret == 0)
            goto finish;

        if (u->rtpoll_item) {
            struct pollfd* pollfd;

            pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);

            if (pollfd->revents & ~POLLOUT) {
                if (u->sink->thread_info.state != PA_SINK_SUSPENDED) {
                    pa_log("FIFO shutdown.");
                    goto fail;
                }

                /* We expect this to happen on occasion if we are not sending data.
                   It's perfectly natural and normal and natural */
                if (u->rtpoll_item)
                    pa_rtpoll_item_free(u->rtpoll_item);
                u->rtpoll_item = NULL;
            }
        }
    }

fail:
    /* If this was no regular exit from the loop we have to continue
     * processing messages until we received PA_MESSAGE_SHUTDOWN */
    pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
    pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);

finish:
    if (silence.memblock)
        pa_memblock_unref(silence.memblock);
    pa_log_debug("Thread shutting down");
}

int pa__init(pa_module*m) {
    struct userdata *u = NULL;
    pa_sample_spec ss;
    pa_modargs *ma = NULL;
    const char *server;
    pa_sink_new_data data;

    pa_assert(m);

    if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
        pa_log("failed to parse module arguments");
        goto fail;
    }

    ss = m->core->default_sample_spec;
    if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
        pa_log("invalid sample format specification");
        goto fail;
    }

    if ((/*ss.format != PA_SAMPLE_U8 &&*/ ss.format != PA_SAMPLE_S16NE) ||
        (ss.channels > 2)) {
        pa_log("sample type support is limited to mono/stereo and U8 or S16NE sample data");
        goto fail;
    }

    u = pa_xnew0(struct userdata, 1);
    u->core = m->core;
    u->module = m;
    m->userdata = u;
    u->fd = -1;
    u->smoother = pa_smoother_new(
            PA_USEC_PER_SEC,
            PA_USEC_PER_SEC*2,
            TRUE,
            TRUE,
            10,
            0,
            FALSE);
    pa_memchunk_reset(&u->raw_memchunk);
    pa_memchunk_reset(&u->encoded_memchunk);
    u->offset = 0;
    u->encoding_overhead = 0;
    u->next_encoding_overhead = 0;
    u->encoding_ratio = 1.0;

    u->rtpoll = pa_rtpoll_new();
    pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
    u->rtpoll_item = NULL;

    /*u->format =
        (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
        (ss.channels == 2 ? ESD_STEREO : ESD_MONO);*/
    u->rate = ss.rate;
    u->block_size = pa_usec_to_bytes(PA_USEC_PER_SEC/20, &ss);

    u->read_data = u->write_data = NULL;
    u->read_index = u->write_index = u->read_length = u->write_length = 0;

    /*u->state = STATE_AUTH;*/
    u->latency = 0;

    if (!(server = pa_modargs_get_value(ma, "server", NULL))) {
        pa_log("No server argument given.");
        goto fail;
    }

    pa_sink_new_data_init(&data);
    data.driver = __FILE__;
    data.module = m;
    pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
    pa_sink_new_data_set_sample_spec(&data, &ss);
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, server);
    pa_proplist_sets(data.proplist, PA_PROP_DEVICE_INTENDED_ROLES, "music");
    pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "RAOP sink '%s'", server);

    if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
        pa_log("Invalid properties");
        pa_sink_new_data_done(&data);
        goto fail;
    }

    u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY|PA_SINK_NETWORK);
    pa_sink_new_data_done(&data);

    if (!u->sink) {
        pa_log("Failed to create sink.");
        goto fail;
    }

    u->sink->parent.process_msg = sink_process_msg;
    u->sink->userdata = u;
    pa_sink_set_set_volume_callback(u->sink, sink_set_volume_cb);
    pa_sink_set_set_mute_callback(u->sink, sink_set_mute_cb);
    u->sink->flags = PA_SINK_LATENCY|PA_SINK_NETWORK;

    pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
    pa_sink_set_rtpoll(u->sink, u->rtpoll);

    if (!(u->raop = pa_raop_client_new(u->core, server))) {
        pa_log("Failed to connect to server.");
        goto fail;
    }

    pa_raop_client_set_callback(u->raop, on_connection, u);
    pa_raop_client_set_closed_callback(u->raop, on_close, u);

    if (!(u->thread = pa_thread_new("raop-sink", thread_func, u))) {
        pa_log("Failed to create thread.");
        goto fail;
    }

    pa_sink_put(u->sink);

    pa_modargs_free(ma);

    return 0;

fail:
    if (ma)
        pa_modargs_free(ma);

    pa__done(m);

    return -1;
}

int pa__get_n_used(pa_module *m) {
    struct userdata *u;

    pa_assert(m);
    pa_assert_se(u = m->userdata);

    return pa_sink_linked_by(u->sink);
}

void pa__done(pa_module*m) {
    struct userdata *u;
    pa_assert(m);

    if (!(u = m->userdata))
        return;

    if (u->sink)
        pa_sink_unlink(u->sink);

    if (u->thread) {
        pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
        pa_thread_free(u->thread);
    }

    pa_thread_mq_done(&u->thread_mq);

    if (u->sink)
        pa_sink_unref(u->sink);

    if (u->rtpoll_item)
        pa_rtpoll_item_free(u->rtpoll_item);

    if (u->rtpoll)
        pa_rtpoll_free(u->rtpoll);

    if (u->raw_memchunk.memblock)
        pa_memblock_unref(u->raw_memchunk.memblock);

    if (u->encoded_memchunk.memblock)
        pa_memblock_unref(u->encoded_memchunk.memblock);

    if (u->raop)
        pa_raop_client_free(u->raop);

    pa_xfree(u->read_data);
    pa_xfree(u->write_data);

    if (u->smoother)
        pa_smoother_free(u->smoother);

    if (u->fd >= 0)
        pa_close(u->fd);

    pa_xfree(u);
}