code.delx.au - pulseaudio/blob - src/modules/module-esound-sink.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdlib.h>
  27 #include <sys/stat.h>
  28 #include <stdio.h>
  29 #include <errno.h>
  30 #include <string.h>
  31 #include <fcntl.h>
  32 #include <unistd.h>
  33 #include <limits.h>
  34 #include <poll.h>
  35 #include <sys/socket.h>
  36 #include <netinet/in.h>
  37 #include <netinet/tcp.h>
  38 #include <sys/ioctl.h>
  39
  40 #ifdef HAVE_LINUX_SOCKIOS_H
  41 #include <linux/sockios.h>
  42 #endif
  43
  44 #include <pulse/xmalloc.h>
  45 #include <pulse/timeval.h>
  46
  47 #include <pulsecore/core-error.h>
  48 #include <pulsecore/iochannel.h>
  49 #include <pulsecore/sink.h>
  50 #include <pulsecore/module.h>
  51 #include <pulsecore/core-util.h>
  52 #include <pulsecore/modargs.h>
  53 #include <pulsecore/log.h>
  54 #include <pulsecore/socket-client.h>
  55 #include <pulsecore/esound.h>
  56 #include <pulsecore/authkey.h>
  57 #include <pulsecore/thread-mq.h>
  58 #include <pulsecore/thread.h>
  59 #include <pulsecore/time-smoother.h>
  60 #include <pulsecore/rtclock.h>
  61 #include <pulsecore/socket-util.h>
  62
  63 #include "module-esound-sink-symdef.h"
  64
  65 PA_MODULE_AUTHOR("Lennart Poettering");
  66 PA_MODULE_DESCRIPTION("ESOUND Sink");
  67 PA_MODULE_VERSION(PACKAGE_VERSION);
  68 PA_MODULE_LOAD_ONCE(FALSE);
  69 PA_MODULE_USAGE(
  70         "sink_name=<name for the sink> "
  71         "sink_properties=<properties for the sink> "
  72         "server=<address> cookie=<filename>  "
  73         "format=<sample format> "
  74         "rate=<sample rate> "
  75         "channels=<number of channels>");
  76
  77 #define DEFAULT_SINK_NAME "esound_out"
  78
  79 struct userdata {
  80     pa_core *core;
  81     pa_module *module;
  82     pa_sink *sink;
  83
  84     pa_thread_mq thread_mq;
  85     pa_rtpoll *rtpoll;
  86     pa_rtpoll_item *rtpoll_item;
  87     pa_thread *thread;
  88
  89     pa_memchunk memchunk;
  90
  91     void *write_data;
  92     size_t write_length, write_index;
  93
  94     void *read_data;
  95     size_t read_length, read_index;
  96
  97     enum {
  98         STATE_AUTH,
  99         STATE_LATENCY,
 100         STATE_PREPARE,
 101         STATE_RUNNING,
 102         STATE_DEAD
 103     } state;
 104
 105     pa_usec_t latency;
 106
 107     esd_format_t format;
 108     int32_t rate;
 109
 110     pa_smoother *smoother;
 111     int fd;
 112
 113     int64_t offset;
 114
 115     pa_iochannel *io;
 116     pa_socket_client *client;
 117
 118     size_t block_size;
 119 };
 120
 121 static const char* const valid_modargs[] = {
 122     "sink_name",
 123     "sink_properties",
 124     "server",
 125     "cookie",
 126     "format",
 127     "rate",
 128     "channels",
 129     NULL
 130 };
 131
 132 enum {
 133     SINK_MESSAGE_PASS_SOCKET = PA_SINK_MESSAGE_MAX
 134 };
 135
 136 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 137     struct userdata *u = PA_SINK(o)->userdata;
 138
 139     switch (code) {
 140
 141         case PA_SINK_MESSAGE_SET_STATE:
 142
 143             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 144
 145                 case PA_SINK_SUSPENDED:
 146                     pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));
 147
 148                     pa_smoother_pause(u->smoother, pa_rtclock_usec());
 149                     break;
 150
 151                 case PA_SINK_IDLE:
 152                 case PA_SINK_RUNNING:
 153
 154                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED)
 155                         pa_smoother_resume(u->smoother, pa_rtclock_usec(), TRUE);
 156
 157                     break;
 158
 159                 case PA_SINK_UNLINKED:
 160                 case PA_SINK_INIT:
 161                 case PA_SINK_INVALID_STATE:
 162                     ;
 163             }
 164
 165             break;
 166
 167         case PA_SINK_MESSAGE_GET_LATENCY: {
 168             pa_usec_t w, r;
 169
 170             r = pa_smoother_get(u->smoother, pa_rtclock_usec());
 171             w = pa_bytes_to_usec((uint64_t) u->offset + u->memchunk.length, &u->sink->sample_spec);
 172
 173             *((pa_usec_t*) data) = w > r ? w - r : 0;
 174             return 0;
 175         }
 176
 177         case SINK_MESSAGE_PASS_SOCKET: {
 178             struct pollfd *pollfd;
 179
 180             pa_assert(!u->rtpoll_item);
 181
 182             u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 183             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 184             pollfd->fd = u->fd;
 185             pollfd->events = pollfd->revents = 0;
 186
 187             return 0;
 188         }
 189     }
 190
 191     return pa_sink_process_msg(o, code, data, offset, chunk);
 192 }
 193
 194 static void thread_func(void *userdata) {
 195     struct userdata *u = userdata;
 196     int write_type = 0;
 197
 198     pa_assert(u);
 199
 200     pa_log_debug("Thread starting up");
 201
 202     pa_thread_mq_install(&u->thread_mq);
 203     pa_rtpoll_install(u->rtpoll);
 204
 205     pa_smoother_set_time_offset(u->smoother, pa_rtclock_usec());
 206
 207     for (;;) {
 208         int ret;
 209
 210         if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
 211             if (u->sink->thread_info.rewind_requested)
 212                 pa_sink_process_rewind(u->sink, 0);
 213
 214         if (u->rtpoll_item) {
 215             struct pollfd *pollfd;
 216             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 217
 218             /* Render some data and write it to the fifo */
 219             if (PA_SINK_IS_OPENED(u->sink->thread_info.state) && pollfd->revents) {
 220                 pa_usec_t usec;
 221                 int64_t n;
 222
 223                 for (;;) {
 224                     ssize_t l;
 225                     void *p;
 226
 227                     if (u->memchunk.length <= 0)
 228                         pa_sink_render(u->sink, u->block_size, &u->memchunk);
 229
 230                     pa_assert(u->memchunk.length > 0);
 231
 232                     p = pa_memblock_acquire(u->memchunk.memblock);
 233                     l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &write_type);
 234                     pa_memblock_release(u->memchunk.memblock);
 235
 236                     pa_assert(l != 0);
 237
 238                     if (l < 0) {
 239
 240                         if (errno == EINTR)
 241                             continue;
 242                         else if (errno == EAGAIN) {
 243
 244                             /* OK, we filled all socket buffers up
 245                              * now. */
 246                             goto filled_up;
 247
 248                         } else {
 249                             pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 250                             goto fail;
 251                         }
 252
 253                     } else {
 254                         u->offset += l;
 255
 256                         u->memchunk.index += (size_t) l;
 257                         u->memchunk.length -= (size_t) l;
 258
 259                         if (u->memchunk.length <= 0) {
 260                             pa_memblock_unref(u->memchunk.memblock);
 261                             pa_memchunk_reset(&u->memchunk);
 262                         }
 263
 264                         pollfd->revents = 0;
 265
 266                         if (u->memchunk.length > 0)
 267
 268                             /* OK, we wrote less that we asked for,
 269                              * hence we can assume that the socket
 270                              * buffers are full now */
 271                             goto filled_up;
 272                     }
 273                 }
 274
 275             filled_up:
 276
 277                 /* At this spot we know that the socket buffers are
 278                  * fully filled up. This is the best time to estimate
 279                  * the playback position of the server */
 280
 281                 n = u->offset;
 282
 283 #ifdef SIOCOUTQ
 284                 {
 285                     int l;
 286                     if (ioctl(u->fd, SIOCOUTQ, &l) >= 0 && l > 0)
 287                         n -= l;
 288                 }
 289 #endif
 290
 291                 usec = pa_bytes_to_usec((uint64_t) n, &u->sink->sample_spec);
 292
 293                 if (usec > u->latency)
 294                     usec -= u->latency;
 295                 else
 296                     usec = 0;
 297
 298                 pa_smoother_put(u->smoother, pa_rtclock_usec(), usec);
 299             }
 300
 301             /* Hmm, nothing to do. Let's sleep */
 302             pollfd->events = (short) (PA_SINK_IS_OPENED(u->sink->thread_info.state) ? POLLOUT : 0);
 303         }
 304
 305         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 306             goto fail;
 307
 308         if (ret == 0)
 309             goto finish;
 310
 311         if (u->rtpoll_item) {
 312             struct pollfd* pollfd;
 313
 314             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 315
 316             if (pollfd->revents & ~POLLOUT) {
 317                 pa_log("FIFO shutdown.");
 318                 goto fail;
 319             }
 320         }
 321     }
 322
 323 fail:
 324     /* If this was no regular exit from the loop we have to continue
 325      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 326     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 327     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 328
 329 finish:
 330     pa_log_debug("Thread shutting down");
 331 }
 332
 333 static int do_write(struct userdata *u) {
 334     ssize_t r;
 335     pa_assert(u);
 336
 337     if (!pa_iochannel_is_writable(u->io))
 338         return 0;
 339
 340     if (u->write_data) {
 341         pa_assert(u->write_index < u->write_length);
 342
 343         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->write_data + u->write_index, u->write_length - u->write_index)) <= 0) {
 344             pa_log("write() failed: %s", pa_cstrerror(errno));
 345             return -1;
 346         }
 347
 348         u->write_index += (size_t) r;
 349         pa_assert(u->write_index <= u->write_length);
 350
 351         if (u->write_index == u->write_length) {
 352             pa_xfree(u->write_data);
 353             u->write_data = NULL;
 354             u->write_index = u->write_length = 0;
 355         }
 356     }
 357
 358     if (!u->write_data && u->state == STATE_PREPARE) {
 359         int so_sndbuf = 0;
 360         socklen_t sl = sizeof(int);
 361
 362         /* OK, we're done with sending all control data we need to, so
 363          * let's hand the socket over to the IO thread now */
 364
 365         pa_assert(u->fd < 0);
 366         u->fd = pa_iochannel_get_send_fd(u->io);
 367
 368         pa_iochannel_set_noclose(u->io, TRUE);
 369         pa_iochannel_free(u->io);
 370         u->io = NULL;
 371
 372         pa_make_tcp_socket_low_delay(u->fd);
 373
 374         if (getsockopt(u->fd, SOL_SOCKET, SO_SNDBUF, &so_sndbuf, &sl) < 0)
 375             pa_log_warn("getsockopt(SO_SNDBUF) failed: %s", pa_cstrerror(errno));
 376         else {
 377             pa_log_debug("SO_SNDBUF is %zu.", (size_t) so_sndbuf);
 378             pa_sink_set_max_request(u->sink, PA_MAX((size_t) so_sndbuf, u->block_size));
 379         }
 380
 381         pa_log_debug("Connection authenticated, handing fd to IO thread...");
 382
 383         pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_PASS_SOCKET, NULL, 0, NULL, NULL);
 384         u->state = STATE_RUNNING;
 385     }
 386
 387     return 0;
 388 }
 389
 390 static int handle_response(struct userdata *u) {
 391     pa_assert(u);
 392
 393     switch (u->state) {
 394
 395         case STATE_AUTH:
 396             pa_assert(u->read_length == sizeof(int32_t));
 397
 398             /* Process auth data */
 399             if (!*(int32_t*) u->read_data) {
 400                 pa_log("Authentication failed: %s", pa_cstrerror(errno));
 401                 return -1;
 402             }
 403
 404             /* Request latency data */
 405             pa_assert(!u->write_data);
 406             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 407
 408             u->write_index = 0;
 409             u->state = STATE_LATENCY;
 410
 411             /* Space for next response */
 412             pa_assert(u->read_length >= sizeof(int32_t));
 413             u->read_index = 0;
 414             u->read_length = sizeof(int32_t);
 415
 416             break;
 417
 418         case STATE_LATENCY: {
 419             int32_t *p;
 420             pa_assert(u->read_length == sizeof(int32_t));
 421
 422             /* Process latency info */
 423             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 424             if (u->latency > 10000000) {
 425                 pa_log_warn("Invalid latency information received from server");
 426                 u->latency = 0;
 427             }
 428
 429             /* Create stream */
 430             pa_assert(!u->write_data);
 431             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 432             *(p++) = ESD_PROTO_STREAM_PLAY;
 433             *(p++) = u->format;
 434             *(p++) = u->rate;
 435             pa_strlcpy((char*) p, "PulseAudio Tunnel", ESD_NAME_MAX);
 436
 437             u->write_index = 0;
 438             u->state = STATE_PREPARE;
 439
 440             /* Don't read any further */
 441             pa_xfree(u->read_data);
 442             u->read_data = NULL;
 443             u->read_index = u->read_length = 0;
 444
 445             break;
 446         }
 447
 448         default:
 449             pa_assert_not_reached();
 450     }
 451
 452     return 0;
 453 }
 454
 455 static int do_read(struct userdata *u) {
 456     pa_assert(u);
 457
 458     if (!pa_iochannel_is_readable(u->io))
 459         return 0;
 460
 461     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 462         ssize_t r;
 463
 464         if (!u->read_data)
 465             return 0;
 466
 467         pa_assert(u->read_index < u->read_length);
 468
 469         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 470             pa_log("read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 471             return -1;
 472         }
 473
 474         u->read_index += (size_t) r;
 475         pa_assert(u->read_index <= u->read_length);
 476
 477         if (u->read_index == u->read_length)
 478             return handle_response(u);
 479     }
 480
 481     return 0;
 482 }
 483
 484 static void io_callback(pa_iochannel *io, void*userdata) {
 485     struct userdata *u = userdata;
 486     pa_assert(u);
 487
 488     if (do_read(u) < 0 || do_write(u) < 0) {
 489
 490         if (u->io) {
 491             pa_iochannel_free(u->io);
 492             u->io = NULL;
 493         }
 494
 495         pa_module_unload_request(u->module, TRUE);
 496     }
 497 }
 498
 499 static void on_connection(pa_socket_client *c, pa_iochannel*io, void *userdata) {
 500     struct userdata *u = userdata;
 501
 502     pa_socket_client_unref(u->client);
 503     u->client = NULL;
 504
 505     if (!io) {
 506         pa_log("Connection failed: %s", pa_cstrerror(errno));
 507         pa_module_unload_request(u->module, TRUE);
 508         return;
 509     }
 510
 511     pa_assert(!u->io);
 512     u->io = io;
 513     pa_iochannel_set_callback(u->io, io_callback, u);
 514
 515     pa_log_debug("Connection established, authenticating ...");
 516 }
 517
 518 int pa__init(pa_module*m) {
 519     struct userdata *u = NULL;
 520     pa_sample_spec ss;
 521     pa_modargs *ma = NULL;
 522     const char *espeaker;
 523     uint32_t key;
 524     pa_sink_new_data data;
 525
 526     pa_assert(m);
 527
 528     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 529         pa_log("failed to parse module arguments");
 530         goto fail;
 531     }
 532
 533     ss = m->core->default_sample_spec;
 534     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 535         pa_log("invalid sample format specification");
 536         goto fail;
 537     }
 538
 539     if ((ss.format != PA_SAMPLE_U8 && ss.format != PA_SAMPLE_S16NE) ||
 540         (ss.channels > 2)) {
 541         pa_log("esound sample type support is limited to mono/stereo and U8 or S16NE sample data");
 542         goto fail;
 543     }
 544
 545     u = pa_xnew0(struct userdata, 1);
 546     u->core = m->core;
 547     u->module = m;
 548     m->userdata = u;
 549     u->fd = -1;
 550     u->smoother = pa_smoother_new(
 551             PA_USEC_PER_SEC,
 552             PA_USEC_PER_SEC*2,
 553             TRUE,
 554             TRUE,
 555             10,
 556             0,
 557             FALSE);
 558     pa_memchunk_reset(&u->memchunk);
 559     u->offset = 0;
 560
 561     u->rtpoll = pa_rtpoll_new();
 562     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 563     u->rtpoll_item = NULL;
 564
 565     u->format =
 566         (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
 567         (ss.channels == 2 ? ESD_STEREO : ESD_MONO);
 568     u->rate = (int32_t) ss.rate;
 569     u->block_size = pa_usec_to_bytes(PA_USEC_PER_SEC/20, &ss);
 570
 571     u->read_data = u->write_data = NULL;
 572     u->read_index = u->write_index = u->read_length = u->write_length = 0;
 573
 574     u->state = STATE_AUTH;
 575     u->latency = 0;
 576
 577     if (!(espeaker = getenv("ESPEAKER")))
 578         espeaker = ESD_UNIX_SOCKET_NAME;
 579
 580     espeaker = pa_modargs_get_value(ma, "server", espeaker);
 581
 582     pa_sink_new_data_init(&data);
 583     data.driver = __FILE__;
 584     data.module = m;
 585     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 586     pa_sink_new_data_set_sample_spec(&data, &ss);
 587     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, espeaker);
 588     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_API, "esd");
 589     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "EsounD Output on %s", espeaker);
 590
 591     if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 592         pa_log("Invalid properties");
 593         pa_sink_new_data_done(&data);
 594         goto fail;
 595     }
 596
 597     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY|PA_SINK_NETWORK);
 598     pa_sink_new_data_done(&data);
 599
 600     if (!u->sink) {
 601         pa_log("Failed to create sink.");
 602         goto fail;
 603     }
 604
 605     u->sink->parent.process_msg = sink_process_msg;
 606     u->sink->userdata = u;
 607
 608     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 609     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 610
 611     if (!(u->client = pa_socket_client_new_string(u->core->mainloop, espeaker, ESD_DEFAULT_PORT))) {
 612         pa_log("Failed to connect to server.");
 613         goto fail;
 614     }
 615
 616     pa_socket_client_set_callback(u->client, on_connection, u);
 617
 618     /* Prepare the initial request */
 619     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 620     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), u->write_data, ESD_KEY_LEN) < 0) {
 621         pa_log("Failed to load cookie");
 622         goto fail;
 623     }
 624
 625     key = ESD_ENDIAN_KEY;
 626     memcpy((uint8_t*) u->write_data + ESD_KEY_LEN, &key, sizeof(key));
 627
 628     /* Reserve space for the response */
 629     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 630
 631     if (!(u->thread = pa_thread_new(thread_func, u))) {
 632         pa_log("Failed to create thread.");
 633         goto fail;
 634     }
 635
 636     pa_sink_put(u->sink);
 637
 638     pa_modargs_free(ma);
 639
 640     return 0;
 641
 642 fail:
 643     if (ma)
 644         pa_modargs_free(ma);
 645
 646     pa__done(m);
 647
 648     return -1;
 649 }
 650
 651 int pa__get_n_used(pa_module *m) {
 652     struct userdata *u;
 653
 654     pa_assert(m);
 655     pa_assert_se(u = m->userdata);
 656
 657     return pa_sink_linked_by(u->sink);
 658 }
 659
 660 void pa__done(pa_module*m) {
 661     struct userdata *u;
 662     pa_assert(m);
 663
 664     if (!(u = m->userdata))
 665         return;
 666
 667     if (u->sink)
 668         pa_sink_unlink(u->sink);
 669
 670     if (u->thread) {
 671         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 672         pa_thread_free(u->thread);
 673     }
 674
 675     pa_thread_mq_done(&u->thread_mq);
 676
 677     if (u->sink)
 678         pa_sink_unref(u->sink);
 679
 680     if (u->io)
 681         pa_iochannel_free(u->io);
 682
 683     if (u->rtpoll_item)
 684         pa_rtpoll_item_free(u->rtpoll_item);
 685
 686     if (u->rtpoll)
 687         pa_rtpoll_free(u->rtpoll);
 688
 689     if (u->memchunk.memblock)
 690         pa_memblock_unref(u->memchunk.memblock);
 691
 692     if (u->client)
 693         pa_socket_client_unref(u->client);
 694
 695     pa_xfree(u->read_data);
 696     pa_xfree(u->write_data);
 697
 698     if (u->smoother)
 699         pa_smoother_free(u->smoother);
 700
 701     if (u->fd >= 0)
 702         pa_close(u->fd);
 703
 704     pa_xfree(u);
 705 }