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/rtclock.h>
  45 #include <pulse/timeval.h>
  46 #include <pulse/xmalloc.h>
  47
  48 #include <pulsecore/core-error.h>
  49 #include <pulsecore/iochannel.h>
  50 #include <pulsecore/sink.h>
  51 #include <pulsecore/module.h>
  52 #include <pulsecore/core-rtclock.h>
  53 #include <pulsecore/core-util.h>
  54 #include <pulsecore/modargs.h>
  55 #include <pulsecore/log.h>
  56 #include <pulsecore/socket-client.h>
  57 #include <pulsecore/esound.h>
  58 #include <pulsecore/authkey.h>
  59 #include <pulsecore/thread-mq.h>
  60 #include <pulsecore/thread.h>
  61 #include <pulsecore/time-smoother.h>
  62 #include <pulsecore/socket-util.h>
  63
  64 #include "module-esound-sink-symdef.h"
  65
  66 PA_MODULE_AUTHOR("Lennart Poettering");
  67 PA_MODULE_DESCRIPTION("ESOUND Sink");
  68 PA_MODULE_VERSION(PACKAGE_VERSION);
  69 PA_MODULE_LOAD_ONCE(FALSE);
  70 PA_MODULE_USAGE(
  71         "sink_name=<name for the sink> "
  72         "sink_properties=<properties for the sink> "
  73         "server=<address> cookie=<filename>  "
  74         "format=<sample format> "
  75         "rate=<sample rate> "
  76         "channels=<number of channels>");
  77
  78 #define DEFAULT_SINK_NAME "esound_out"
  79
  80 struct userdata {
  81     pa_core *core;
  82     pa_module *module;
  83     pa_sink *sink;
  84
  85     pa_thread_mq thread_mq;
  86     pa_rtpoll *rtpoll;
  87     pa_rtpoll_item *rtpoll_item;
  88     pa_thread *thread;
  89
  90     pa_memchunk memchunk;
  91
  92     void *write_data;
  93     size_t write_length, write_index;
  94
  95     void *read_data;
  96     size_t read_length, read_index;
  97
  98     enum {
  99         STATE_AUTH,
 100         STATE_LATENCY,
 101         STATE_PREPARE,
 102         STATE_RUNNING,
 103         STATE_DEAD
 104     } state;
 105
 106     pa_usec_t latency;
 107
 108     esd_format_t format;
 109     int32_t rate;
 110
 111     pa_smoother *smoother;
 112     int fd;
 113
 114     int64_t offset;
 115
 116     pa_iochannel *io;
 117     pa_socket_client *client;
 118
 119     size_t block_size;
 120 };
 121
 122 static const char* const valid_modargs[] = {
 123     "sink_name",
 124     "sink_properties",
 125     "server",
 126     "cookie",
 127     "format",
 128     "rate",
 129     "channels",
 130     NULL
 131 };
 132
 133 enum {
 134     SINK_MESSAGE_PASS_SOCKET = PA_SINK_MESSAGE_MAX
 135 };
 136
 137 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 138     struct userdata *u = PA_SINK(o)->userdata;
 139
 140     switch (code) {
 141
 142         case PA_SINK_MESSAGE_SET_STATE:
 143
 144             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 145
 146                 case PA_SINK_SUSPENDED:
 147                     pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));
 148
 149                     pa_smoother_pause(u->smoother, pa_rtclock_now());
 150                     break;
 151
 152                 case PA_SINK_IDLE:
 153                 case PA_SINK_RUNNING:
 154
 155                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED)
 156                         pa_smoother_resume(u->smoother, pa_rtclock_now(), TRUE);
 157
 158                     break;
 159
 160                 case PA_SINK_UNLINKED:
 161                 case PA_SINK_INIT:
 162                 case PA_SINK_INVALID_STATE:
 163                     ;
 164             }
 165
 166             break;
 167
 168         case PA_SINK_MESSAGE_GET_LATENCY: {
 169             pa_usec_t w, r;
 170
 171             r = pa_smoother_get(u->smoother, pa_rtclock_now());
 172             w = pa_bytes_to_usec((uint64_t) u->offset + u->memchunk.length, &u->sink->sample_spec);
 173
 174             *((pa_usec_t*) data) = w > r ? w - r : 0;
 175             return 0;
 176         }
 177
 178         case SINK_MESSAGE_PASS_SOCKET: {
 179             struct pollfd *pollfd;
 180
 181             pa_assert(!u->rtpoll_item);
 182
 183             u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 184             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 185             pollfd->fd = u->fd;
 186             pollfd->events = pollfd->revents = 0;
 187
 188             return 0;
 189         }
 190     }
 191
 192     return pa_sink_process_msg(o, code, data, offset, chunk);
 193 }
 194
 195 static void thread_func(void *userdata) {
 196     struct userdata *u = userdata;
 197     int write_type = 0;
 198
 199     pa_assert(u);
 200
 201     pa_log_debug("Thread starting up");
 202
 203     pa_thread_mq_install(&u->thread_mq);
 204     pa_rtpoll_install(u->rtpoll);
 205
 206     pa_smoother_set_time_offset(u->smoother, pa_rtclock_now());
 207
 208     for (;;) {
 209         int ret;
 210
 211         if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
 212             if (u->sink->thread_info.rewind_requested)
 213                 pa_sink_process_rewind(u->sink, 0);
 214
 215         if (u->rtpoll_item) {
 216             struct pollfd *pollfd;
 217             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 218
 219             /* Render some data and write it to the fifo */
 220             if (PA_SINK_IS_OPENED(u->sink->thread_info.state) && pollfd->revents) {
 221                 pa_usec_t usec;
 222                 int64_t n;
 223
 224                 for (;;) {
 225                     ssize_t l;
 226                     void *p;
 227
 228                     if (u->memchunk.length <= 0)
 229                         pa_sink_render(u->sink, u->block_size, &u->memchunk);
 230
 231                     pa_assert(u->memchunk.length > 0);
 232
 233                     p = pa_memblock_acquire(u->memchunk.memblock);
 234                     l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &write_type);
 235                     pa_memblock_release(u->memchunk.memblock);
 236
 237                     pa_assert(l != 0);
 238
 239                     if (l < 0) {
 240
 241                         if (errno == EINTR)
 242                             continue;
 243                         else if (errno == EAGAIN) {
 244
 245                             /* OK, we filled all socket buffers up
 246                              * now. */
 247                             goto filled_up;
 248
 249                         } else {
 250                             pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 251                             goto fail;
 252                         }
 253
 254                     } else {
 255                         u->offset += l;
 256
 257                         u->memchunk.index += (size_t) l;
 258                         u->memchunk.length -= (size_t) l;
 259
 260                         if (u->memchunk.length <= 0) {
 261                             pa_memblock_unref(u->memchunk.memblock);
 262                             pa_memchunk_reset(&u->memchunk);
 263                         }
 264
 265                         pollfd->revents = 0;
 266
 267                         if (u->memchunk.length > 0)
 268
 269                             /* OK, we wrote less that we asked for,
 270                              * hence we can assume that the socket
 271                              * buffers are full now */
 272                             goto filled_up;
 273                     }
 274                 }
 275
 276             filled_up:
 277
 278                 /* At this spot we know that the socket buffers are
 279                  * fully filled up. This is the best time to estimate
 280                  * the playback position of the server */
 281
 282                 n = u->offset;
 283
 284 #ifdef SIOCOUTQ
 285                 {
 286                     int l;
 287                     if (ioctl(u->fd, SIOCOUTQ, &l) >= 0 && l > 0)
 288                         n -= l;
 289                 }
 290 #endif
 291
 292                 usec = pa_bytes_to_usec((uint64_t) n, &u->sink->sample_spec);
 293
 294                 if (usec > u->latency)
 295                     usec -= u->latency;
 296                 else
 297                     usec = 0;
 298
 299                 pa_smoother_put(u->smoother, pa_rtclock_now(), usec);
 300             }
 301
 302             /* Hmm, nothing to do. Let's sleep */
 303             pollfd->events = (short) (PA_SINK_IS_OPENED(u->sink->thread_info.state) ? POLLOUT : 0);
 304         }
 305
 306         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 307             goto fail;
 308
 309         if (ret == 0)
 310             goto finish;
 311
 312         if (u->rtpoll_item) {
 313             struct pollfd* pollfd;
 314
 315             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 316
 317             if (pollfd->revents & ~POLLOUT) {
 318                 pa_log("FIFO shutdown.");
 319                 goto fail;
 320             }
 321         }
 322     }
 323
 324 fail:
 325     /* If this was no regular exit from the loop we have to continue
 326      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 327     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 328     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 329
 330 finish:
 331     pa_log_debug("Thread shutting down");
 332 }
 333
 334 static int do_write(struct userdata *u) {
 335     ssize_t r;
 336     pa_assert(u);
 337
 338     if (!pa_iochannel_is_writable(u->io))
 339         return 0;
 340
 341     if (u->write_data) {
 342         pa_assert(u->write_index < u->write_length);
 343
 344         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->write_data + u->write_index, u->write_length - u->write_index)) <= 0) {
 345             pa_log("write() failed: %s", pa_cstrerror(errno));
 346             return -1;
 347         }
 348
 349         u->write_index += (size_t) r;
 350         pa_assert(u->write_index <= u->write_length);
 351
 352         if (u->write_index == u->write_length) {
 353             pa_xfree(u->write_data);
 354             u->write_data = NULL;
 355             u->write_index = u->write_length = 0;
 356         }
 357     }
 358
 359     if (!u->write_data && u->state == STATE_PREPARE) {
 360         int so_sndbuf = 0;
 361         socklen_t sl = sizeof(int);
 362
 363         /* OK, we're done with sending all control data we need to, so
 364          * let's hand the socket over to the IO thread now */
 365
 366         pa_assert(u->fd < 0);
 367         u->fd = pa_iochannel_get_send_fd(u->io);
 368
 369         pa_iochannel_set_noclose(u->io, TRUE);
 370         pa_iochannel_free(u->io);
 371         u->io = NULL;
 372
 373         pa_make_tcp_socket_low_delay(u->fd);
 374
 375         if (getsockopt(u->fd, SOL_SOCKET, SO_SNDBUF, &so_sndbuf, &sl) < 0)
 376             pa_log_warn("getsockopt(SO_SNDBUF) failed: %s", pa_cstrerror(errno));
 377         else {
 378             pa_log_debug("SO_SNDBUF is %zu.", (size_t) so_sndbuf);
 379             pa_sink_set_max_request(u->sink, PA_MAX((size_t) so_sndbuf, u->block_size));
 380         }
 381
 382         pa_log_debug("Connection authenticated, handing fd to IO thread...");
 383
 384         pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_PASS_SOCKET, NULL, 0, NULL, NULL);
 385         u->state = STATE_RUNNING;
 386     }
 387
 388     return 0;
 389 }
 390
 391 static int handle_response(struct userdata *u) {
 392     pa_assert(u);
 393
 394     switch (u->state) {
 395
 396         case STATE_AUTH:
 397             pa_assert(u->read_length == sizeof(int32_t));
 398
 399             /* Process auth data */
 400             if (!*(int32_t*) u->read_data) {
 401                 pa_log("Authentication failed: %s", pa_cstrerror(errno));
 402                 return -1;
 403             }
 404
 405             /* Request latency data */
 406             pa_assert(!u->write_data);
 407             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 408
 409             u->write_index = 0;
 410             u->state = STATE_LATENCY;
 411
 412             /* Space for next response */
 413             pa_assert(u->read_length >= sizeof(int32_t));
 414             u->read_index = 0;
 415             u->read_length = sizeof(int32_t);
 416
 417             break;
 418
 419         case STATE_LATENCY: {
 420             int32_t *p;
 421             pa_assert(u->read_length == sizeof(int32_t));
 422
 423             /* Process latency info */
 424             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 425             if (u->latency > 10000000) {
 426                 pa_log_warn("Invalid latency information received from server");
 427                 u->latency = 0;
 428             }
 429
 430             /* Create stream */
 431             pa_assert(!u->write_data);
 432             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 433             *(p++) = ESD_PROTO_STREAM_PLAY;
 434             *(p++) = u->format;
 435             *(p++) = u->rate;
 436             pa_strlcpy((char*) p, "PulseAudio Tunnel", ESD_NAME_MAX);
 437
 438             u->write_index = 0;
 439             u->state = STATE_PREPARE;
 440
 441             /* Don't read any further */
 442             pa_xfree(u->read_data);
 443             u->read_data = NULL;
 444             u->read_index = u->read_length = 0;
 445
 446             break;
 447         }
 448
 449         default:
 450             pa_assert_not_reached();
 451     }
 452
 453     return 0;
 454 }
 455
 456 static int do_read(struct userdata *u) {
 457     pa_assert(u);
 458
 459     if (!pa_iochannel_is_readable(u->io))
 460         return 0;
 461
 462     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 463         ssize_t r;
 464
 465         if (!u->read_data)
 466             return 0;
 467
 468         pa_assert(u->read_index < u->read_length);
 469
 470         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 471             pa_log("read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 472             return -1;
 473         }
 474
 475         u->read_index += (size_t) r;
 476         pa_assert(u->read_index <= u->read_length);
 477
 478         if (u->read_index == u->read_length)
 479             return handle_response(u);
 480     }
 481
 482     return 0;
 483 }
 484
 485 static void io_callback(pa_iochannel *io, void*userdata) {
 486     struct userdata *u = userdata;
 487     pa_assert(u);
 488
 489     if (do_read(u) < 0 || do_write(u) < 0) {
 490
 491         if (u->io) {
 492             pa_iochannel_free(u->io);
 493             u->io = NULL;
 494         }
 495
 496         pa_module_unload_request(u->module, TRUE);
 497     }
 498 }
 499
 500 static void on_connection(pa_socket_client *c, pa_iochannel*io, void *userdata) {
 501     struct userdata *u = userdata;
 502
 503     pa_socket_client_unref(u->client);
 504     u->client = NULL;
 505
 506     if (!io) {
 507         pa_log("Connection failed: %s", pa_cstrerror(errno));
 508         pa_module_unload_request(u->module, TRUE);
 509         return;
 510     }
 511
 512     pa_assert(!u->io);
 513     u->io = io;
 514     pa_iochannel_set_callback(u->io, io_callback, u);
 515
 516     pa_log_debug("Connection established, authenticating ...");
 517 }
 518
 519 int pa__init(pa_module*m) {
 520     struct userdata *u = NULL;
 521     pa_sample_spec ss;
 522     pa_modargs *ma = NULL;
 523     const char *espeaker;
 524     uint32_t key;
 525     pa_sink_new_data data;
 526
 527     pa_assert(m);
 528
 529     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 530         pa_log("failed to parse module arguments");
 531         goto fail;
 532     }
 533
 534     ss = m->core->default_sample_spec;
 535     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 536         pa_log("invalid sample format specification");
 537         goto fail;
 538     }
 539
 540     if ((ss.format != PA_SAMPLE_U8 && ss.format != PA_SAMPLE_S16NE) ||
 541         (ss.channels > 2)) {
 542         pa_log("esound sample type support is limited to mono/stereo and U8 or S16NE sample data");
 543         goto fail;
 544     }
 545
 546     u = pa_xnew0(struct userdata, 1);
 547     u->core = m->core;
 548     u->module = m;
 549     m->userdata = u;
 550     u->fd = -1;
 551     u->smoother = pa_smoother_new(
 552             PA_USEC_PER_SEC,
 553             PA_USEC_PER_SEC*2,
 554             TRUE,
 555             TRUE,
 556             10,
 557             0,
 558             FALSE);
 559     pa_memchunk_reset(&u->memchunk);
 560     u->offset = 0;
 561
 562     u->rtpoll = pa_rtpoll_new();
 563     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 564     u->rtpoll_item = NULL;
 565
 566     u->format =
 567         (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
 568         (ss.channels == 2 ? ESD_STEREO : ESD_MONO);
 569     u->rate = (int32_t) ss.rate;
 570     u->block_size = pa_usec_to_bytes(PA_USEC_PER_SEC/20, &ss);
 571
 572     u->read_data = u->write_data = NULL;
 573     u->read_index = u->write_index = u->read_length = u->write_length = 0;
 574
 575     u->state = STATE_AUTH;
 576     u->latency = 0;
 577
 578     if (!(espeaker = getenv("ESPEAKER")))
 579         espeaker = ESD_UNIX_SOCKET_NAME;
 580
 581     espeaker = pa_modargs_get_value(ma, "server", espeaker);
 582
 583     pa_sink_new_data_init(&data);
 584     data.driver = __FILE__;
 585     data.module = m;
 586     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 587     pa_sink_new_data_set_sample_spec(&data, &ss);
 588     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, espeaker);
 589     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_API, "esd");
 590     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "EsounD Output on %s", espeaker);
 591
 592     if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 593         pa_log("Invalid properties");
 594         pa_sink_new_data_done(&data);
 595         goto fail;
 596     }
 597
 598     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY|PA_SINK_NETWORK);
 599     pa_sink_new_data_done(&data);
 600
 601     if (!u->sink) {
 602         pa_log("Failed to create sink.");
 603         goto fail;
 604     }
 605
 606     u->sink->parent.process_msg = sink_process_msg;
 607     u->sink->userdata = u;
 608
 609     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 610     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 611
 612     if (!(u->client = pa_socket_client_new_string(u->core->mainloop, espeaker, ESD_DEFAULT_PORT))) {
 613         pa_log("Failed to connect to server.");
 614         goto fail;
 615     }
 616
 617     pa_socket_client_set_callback(u->client, on_connection, u);
 618
 619     /* Prepare the initial request */
 620     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 621     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), u->write_data, ESD_KEY_LEN) < 0) {
 622         pa_log("Failed to load cookie");
 623         goto fail;
 624     }
 625
 626     key = ESD_ENDIAN_KEY;
 627     memcpy((uint8_t*) u->write_data + ESD_KEY_LEN, &key, sizeof(key));
 628
 629     /* Reserve space for the response */
 630     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 631
 632     if (!(u->thread = pa_thread_new(thread_func, u))) {
 633         pa_log("Failed to create thread.");
 634         goto fail;
 635     }
 636
 637     pa_sink_put(u->sink);
 638
 639     pa_modargs_free(ma);
 640
 641     return 0;
 642
 643 fail:
 644     if (ma)
 645         pa_modargs_free(ma);
 646
 647     pa__done(m);
 648
 649     return -1;
 650 }
 651
 652 int pa__get_n_used(pa_module *m) {
 653     struct userdata *u;
 654
 655     pa_assert(m);
 656     pa_assert_se(u = m->userdata);
 657
 658     return pa_sink_linked_by(u->sink);
 659 }
 660
 661 void pa__done(pa_module*m) {
 662     struct userdata *u;
 663     pa_assert(m);
 664
 665     if (!(u = m->userdata))
 666         return;
 667
 668     if (u->sink)
 669         pa_sink_unlink(u->sink);
 670
 671     if (u->thread) {
 672         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 673         pa_thread_free(u->thread);
 674     }
 675
 676     pa_thread_mq_done(&u->thread_mq);
 677
 678     if (u->sink)
 679         pa_sink_unref(u->sink);
 680
 681     if (u->io)
 682         pa_iochannel_free(u->io);
 683
 684     if (u->rtpoll_item)
 685         pa_rtpoll_item_free(u->rtpoll_item);
 686
 687     if (u->rtpoll)
 688         pa_rtpoll_free(u->rtpoll);
 689
 690     if (u->memchunk.memblock)
 691         pa_memblock_unref(u->memchunk.memblock);
 692
 693     if (u->client)
 694         pa_socket_client_unref(u->client);
 695
 696     pa_xfree(u->read_data);
 697     pa_xfree(u->write_data);
 698
 699     if (u->smoother)
 700         pa_smoother_free(u->smoother);
 701
 702     if (u->fd >= 0)
 703         pa_close(u->fd);
 704
 705     pa_xfree(u);
 706 }