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 <stdio.h>
  28 #include <errno.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31
  32 #ifdef HAVE_NETINET_IN_H
  33 #include <netinet/in.h>
  34 #endif
  35
  36 #ifdef HAVE_NETINET_TCP_H
  37 #include <netinet/tcp.h>
  38 #endif
  39
  40 #ifdef HAVE_SYS_IOCTL_H
  41 #include <sys/ioctl.h>
  42 #endif
  43
  44 #ifdef HAVE_LINUX_SOCKIOS_H
  45 #include <linux/sockios.h>
  46 #endif
  47
  48 #include <pulse/rtclock.h>
  49 #include <pulse/timeval.h>
  50 #include <pulse/xmalloc.h>
  51
  52 #include <pulsecore/socket.h>
  53 #include <pulsecore/core-error.h>
  54 #include <pulsecore/iochannel.h>
  55 #include <pulsecore/sink.h>
  56 #include <pulsecore/module.h>
  57 #include <pulsecore/core-util.h>
  58 #include <pulsecore/modargs.h>
  59 #include <pulsecore/log.h>
  60 #include <pulsecore/socket-client.h>
  61 #include <pulsecore/esound.h>
  62 #include <pulsecore/authkey.h>
  63 #include <pulsecore/thread-mq.h>
  64 #include <pulsecore/thread.h>
  65 #include <pulsecore/time-smoother.h>
  66 #include <pulsecore/socket-util.h>
  67 #include <pulsecore/rtpoll.h>
  68 #include <pulsecore/poll.h>
  69
  70 #include "module-esound-sink-symdef.h"
  71
  72 PA_MODULE_AUTHOR("Lennart Poettering");
  73 PA_MODULE_DESCRIPTION("ESOUND Sink");
  74 PA_MODULE_VERSION(PACKAGE_VERSION);
  75 PA_MODULE_LOAD_ONCE(false);
  76 PA_MODULE_USAGE(
  77         "sink_name=<name for the sink> "
  78         "sink_properties=<properties for the sink> "
  79         "server=<address> cookie=<filename>  "
  80         "format=<sample format> "
  81         "rate=<sample rate> "
  82         "channels=<number of channels>");
  83
  84 #define DEFAULT_SINK_NAME "esound_out"
  85
  86 struct userdata {
  87     pa_core *core;
  88     pa_module *module;
  89     pa_sink *sink;
  90
  91     pa_thread_mq thread_mq;
  92     pa_rtpoll *rtpoll;
  93     pa_rtpoll_item *rtpoll_item;
  94     pa_thread *thread;
  95
  96     pa_memchunk memchunk;
  97
  98     void *write_data;
  99     size_t write_length, write_index;
 100
 101     void *read_data;
 102     size_t read_length, read_index;
 103
 104     enum {
 105         STATE_AUTH,
 106         STATE_LATENCY,
 107         STATE_PREPARE,
 108         STATE_RUNNING,
 109         STATE_DEAD
 110     } state;
 111
 112     pa_usec_t latency;
 113
 114     esd_format_t format;
 115     int32_t rate;
 116
 117     pa_smoother *smoother;
 118     int fd;
 119
 120     int64_t offset;
 121
 122     pa_iochannel *io;
 123     pa_socket_client *client;
 124
 125     size_t block_size;
 126 };
 127
 128 static const char* const valid_modargs[] = {
 129     "sink_name",
 130     "sink_properties",
 131     "server",
 132     "cookie",
 133     "format",
 134     "rate",
 135     "channels",
 136     NULL
 137 };
 138
 139 enum {
 140     SINK_MESSAGE_PASS_SOCKET = PA_SINK_MESSAGE_MAX
 141 };
 142
 143 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
 144     struct userdata *u = PA_SINK(o)->userdata;
 145
 146     switch (code) {
 147
 148         case PA_SINK_MESSAGE_SET_STATE:
 149
 150             switch ((pa_sink_state_t) PA_PTR_TO_UINT(data)) {
 151
 152                 case PA_SINK_SUSPENDED:
 153                     pa_assert(PA_SINK_IS_OPENED(u->sink->thread_info.state));
 154
 155                     pa_smoother_pause(u->smoother, pa_rtclock_now());
 156                     break;
 157
 158                 case PA_SINK_IDLE:
 159                 case PA_SINK_RUNNING:
 160
 161                     if (u->sink->thread_info.state == PA_SINK_SUSPENDED)
 162                         pa_smoother_resume(u->smoother, pa_rtclock_now(), true);
 163
 164                     break;
 165
 166                 case PA_SINK_UNLINKED:
 167                 case PA_SINK_INIT:
 168                 case PA_SINK_INVALID_STATE:
 169                     ;
 170             }
 171
 172             break;
 173
 174         case PA_SINK_MESSAGE_GET_LATENCY: {
 175             pa_usec_t w, r;
 176
 177             r = pa_smoother_get(u->smoother, pa_rtclock_now());
 178             w = pa_bytes_to_usec((uint64_t) u->offset + u->memchunk.length, &u->sink->sample_spec);
 179
 180             *((pa_usec_t*) data) = w > r ? w - r : 0;
 181             return 0;
 182         }
 183
 184         case SINK_MESSAGE_PASS_SOCKET: {
 185             struct pollfd *pollfd;
 186
 187             pa_assert(!u->rtpoll_item);
 188
 189             u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 190             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 191             pollfd->fd = u->fd;
 192             pollfd->events = pollfd->revents = 0;
 193
 194             return 0;
 195         }
 196     }
 197
 198     return pa_sink_process_msg(o, code, data, offset, chunk);
 199 }
 200
 201 static void thread_func(void *userdata) {
 202     struct userdata *u = userdata;
 203     int write_type = 0;
 204
 205     pa_assert(u);
 206
 207     pa_log_debug("Thread starting up");
 208
 209     pa_thread_mq_install(&u->thread_mq);
 210
 211     pa_smoother_set_time_offset(u->smoother, pa_rtclock_now());
 212
 213     for (;;) {
 214         int ret;
 215
 216         if (PA_UNLIKELY(u->sink->thread_info.rewind_requested))
 217             pa_sink_process_rewind(u->sink, 0);
 218
 219         if (u->rtpoll_item) {
 220             struct pollfd *pollfd;
 221             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 222
 223             /* Render some data and write it to the fifo */
 224             if (PA_SINK_IS_OPENED(u->sink->thread_info.state) && pollfd->revents) {
 225                 pa_usec_t usec;
 226                 int64_t n;
 227
 228                 for (;;) {
 229                     ssize_t l;
 230                     void *p;
 231
 232                     if (u->memchunk.length <= 0)
 233                         pa_sink_render(u->sink, u->block_size, &u->memchunk);
 234
 235                     pa_assert(u->memchunk.length > 0);
 236
 237                     p = pa_memblock_acquire(u->memchunk.memblock);
 238                     l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &write_type);
 239                     pa_memblock_release(u->memchunk.memblock);
 240
 241                     pa_assert(l != 0);
 242
 243                     if (l < 0) {
 244
 245                         if (errno == EINTR)
 246                             continue;
 247                         else if (errno == EAGAIN) {
 248
 249                             /* OK, we filled all socket buffers up
 250                              * now. */
 251                             goto filled_up;
 252
 253                         } else {
 254                             pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 255                             goto fail;
 256                         }
 257
 258                     } else {
 259                         u->offset += l;
 260
 261                         u->memchunk.index += (size_t) l;
 262                         u->memchunk.length -= (size_t) l;
 263
 264                         if (u->memchunk.length <= 0) {
 265                             pa_memblock_unref(u->memchunk.memblock);
 266                             pa_memchunk_reset(&u->memchunk);
 267                         }
 268
 269                         pollfd->revents = 0;
 270
 271                         if (u->memchunk.length > 0)
 272
 273                             /* OK, we wrote less that we asked for,
 274                              * hence we can assume that the socket
 275                              * buffers are full now */
 276                             goto filled_up;
 277                     }
 278                 }
 279
 280             filled_up:
 281
 282                 /* At this spot we know that the socket buffers are
 283                  * fully filled up. This is the best time to estimate
 284                  * the playback position of the server */
 285
 286                 n = u->offset;
 287
 288 #ifdef SIOCOUTQ
 289                 {
 290                     int l;
 291                     if (ioctl(u->fd, SIOCOUTQ, &l) >= 0 && l > 0)
 292                         n -= l;
 293                 }
 294 #endif
 295
 296                 usec = pa_bytes_to_usec((uint64_t) n, &u->sink->sample_spec);
 297
 298                 if (usec > u->latency)
 299                     usec -= u->latency;
 300                 else
 301                     usec = 0;
 302
 303                 pa_smoother_put(u->smoother, pa_rtclock_now(), usec);
 304             }
 305
 306             /* Hmm, nothing to do. Let's sleep */
 307             pollfd->events = (short) (PA_SINK_IS_OPENED(u->sink->thread_info.state) ? POLLOUT : 0);
 308         }
 309
 310         if ((ret = pa_rtpoll_run(u->rtpoll, true)) < 0)
 311             goto fail;
 312
 313         if (ret == 0)
 314             goto finish;
 315
 316         if (u->rtpoll_item) {
 317             struct pollfd* pollfd;
 318
 319             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 320
 321             if (pollfd->revents & ~POLLOUT) {
 322                 pa_log("FIFO shutdown.");
 323                 goto fail;
 324             }
 325         }
 326     }
 327
 328 fail:
 329     /* If this was no regular exit from the loop we have to continue
 330      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 331     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 332     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 333
 334 finish:
 335     pa_log_debug("Thread shutting down");
 336 }
 337
 338 static int do_write(struct userdata *u) {
 339     ssize_t r;
 340     pa_assert(u);
 341
 342     if (!pa_iochannel_is_writable(u->io))
 343         return 0;
 344
 345     if (u->write_data) {
 346         pa_assert(u->write_index < u->write_length);
 347
 348         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->write_data + u->write_index, u->write_length - u->write_index)) < 0) {
 349             pa_log("write() failed: %s", pa_cstrerror(errno));
 350             return -1;
 351         }
 352
 353         u->write_index += (size_t) r;
 354         pa_assert(u->write_index <= u->write_length);
 355
 356         if (u->write_index == u->write_length) {
 357             pa_xfree(u->write_data);
 358             u->write_data = NULL;
 359             u->write_index = u->write_length = 0;
 360         }
 361     }
 362
 363     if (!u->write_data && u->state == STATE_PREPARE) {
 364         int so_sndbuf = 0;
 365         socklen_t sl = sizeof(int);
 366
 367         /* OK, we're done with sending all control data we need to, so
 368          * let's hand the socket over to the IO thread now */
 369
 370         pa_assert(u->fd < 0);
 371         u->fd = pa_iochannel_get_send_fd(u->io);
 372
 373         pa_iochannel_set_noclose(u->io, true);
 374         pa_iochannel_free(u->io);
 375         u->io = NULL;
 376
 377         pa_make_tcp_socket_low_delay(u->fd);
 378
 379         if (getsockopt(u->fd, SOL_SOCKET, SO_SNDBUF, (void *) &so_sndbuf, &sl) < 0)
 380             pa_log_warn("getsockopt(SO_SNDBUF) failed: %s", pa_cstrerror(errno));
 381         else {
 382             pa_log_debug("SO_SNDBUF is %zu.", (size_t) so_sndbuf);
 383             pa_sink_set_max_request(u->sink, PA_MAX((size_t) so_sndbuf, u->block_size));
 384         }
 385
 386         pa_log_debug("Connection authenticated, handing fd to IO thread...");
 387
 388         pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_PASS_SOCKET, NULL, 0, NULL, NULL);
 389         u->state = STATE_RUNNING;
 390     }
 391
 392     return 0;
 393 }
 394
 395 static int handle_response(struct userdata *u) {
 396     pa_assert(u);
 397
 398     switch (u->state) {
 399
 400         case STATE_AUTH:
 401             pa_assert(u->read_length == sizeof(int32_t));
 402
 403             /* Process auth data */
 404             if (!*(int32_t*) u->read_data) {
 405                 pa_log("Authentication failed: %s", pa_cstrerror(errno));
 406                 return -1;
 407             }
 408
 409             /* Request latency data */
 410             pa_assert(!u->write_data);
 411             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 412
 413             u->write_index = 0;
 414             u->state = STATE_LATENCY;
 415
 416             /* Space for next response */
 417             pa_assert(u->read_length >= sizeof(int32_t));
 418             u->read_index = 0;
 419             u->read_length = sizeof(int32_t);
 420
 421             break;
 422
 423         case STATE_LATENCY: {
 424             int32_t *p;
 425             pa_assert(u->read_length == sizeof(int32_t));
 426
 427             /* Process latency info */
 428             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 429             if (u->latency > 10000000) {
 430                 pa_log_warn("Invalid latency information received from server");
 431                 u->latency = 0;
 432             }
 433
 434             /* Create stream */
 435             pa_assert(!u->write_data);
 436             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 437             *(p++) = ESD_PROTO_STREAM_PLAY;
 438             *(p++) = u->format;
 439             *(p++) = u->rate;
 440             pa_strlcpy((char*) p, "PulseAudio Tunnel", ESD_NAME_MAX);
 441
 442             u->write_index = 0;
 443             u->state = STATE_PREPARE;
 444
 445             /* Don't read any further */
 446             pa_xfree(u->read_data);
 447             u->read_data = NULL;
 448             u->read_index = u->read_length = 0;
 449
 450             break;
 451         }
 452
 453         default:
 454             pa_assert_not_reached();
 455     }
 456
 457     return 0;
 458 }
 459
 460 static int do_read(struct userdata *u) {
 461     pa_assert(u);
 462
 463     if (!pa_iochannel_is_readable(u->io))
 464         return 0;
 465
 466     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 467         ssize_t r;
 468
 469         if (!u->read_data)
 470             return 0;
 471
 472         pa_assert(u->read_index < u->read_length);
 473
 474         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 475             pa_log("read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 476             return -1;
 477         }
 478
 479         u->read_index += (size_t) r;
 480         pa_assert(u->read_index <= u->read_length);
 481
 482         if (u->read_index == u->read_length)
 483             return handle_response(u);
 484     }
 485
 486     return 0;
 487 }
 488
 489 static void io_callback(pa_iochannel *io, void*userdata) {
 490     struct userdata *u = userdata;
 491     pa_assert(u);
 492
 493     if (do_read(u) < 0 || do_write(u) < 0) {
 494
 495         if (u->io) {
 496             pa_iochannel_free(u->io);
 497             u->io = NULL;
 498         }
 499
 500         pa_module_unload_request(u->module, true);
 501     }
 502 }
 503
 504 static void on_connection(pa_socket_client *c, pa_iochannel*io, void *userdata) {
 505     struct userdata *u = userdata;
 506
 507     pa_socket_client_unref(u->client);
 508     u->client = NULL;
 509
 510     if (!io) {
 511         pa_log("Connection failed: %s", pa_cstrerror(errno));
 512         pa_module_unload_request(u->module, true);
 513         return;
 514     }
 515
 516     pa_assert(!u->io);
 517     u->io = io;
 518     pa_iochannel_set_callback(u->io, io_callback, u);
 519
 520     pa_log_debug("Connection established, authenticating ...");
 521 }
 522
 523 int pa__init(pa_module*m) {
 524     struct userdata *u = NULL;
 525     pa_sample_spec ss;
 526     pa_modargs *ma = NULL;
 527     const char *espeaker;
 528     uint32_t key;
 529     pa_sink_new_data data;
 530
 531     pa_assert(m);
 532
 533     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 534         pa_log("failed to parse module arguments");
 535         goto fail;
 536     }
 537
 538     ss = m->core->default_sample_spec;
 539     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 540         pa_log("invalid sample format specification");
 541         goto fail;
 542     }
 543
 544     if ((ss.format != PA_SAMPLE_U8 && ss.format != PA_SAMPLE_S16NE) ||
 545         (ss.channels > 2)) {
 546         pa_log("esound sample type support is limited to mono/stereo and U8 or S16NE sample data");
 547         goto fail;
 548     }
 549
 550     u = pa_xnew0(struct userdata, 1);
 551     u->core = m->core;
 552     u->module = m;
 553     m->userdata = u;
 554     u->fd = -1;
 555     u->smoother = pa_smoother_new(
 556             PA_USEC_PER_SEC,
 557             PA_USEC_PER_SEC*2,
 558             true,
 559             true,
 560             10,
 561             0,
 562             false);
 563     pa_memchunk_reset(&u->memchunk);
 564     u->offset = 0;
 565
 566     u->rtpoll = pa_rtpoll_new();
 567     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 568     u->rtpoll_item = NULL;
 569
 570     u->format =
 571         (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
 572         (ss.channels == 2 ? ESD_STEREO : ESD_MONO);
 573     u->rate = (int32_t) ss.rate;
 574     u->block_size = pa_usec_to_bytes(PA_USEC_PER_SEC/20, &ss);
 575
 576     u->read_data = u->write_data = NULL;
 577     u->read_index = u->write_index = u->read_length = u->write_length = 0;
 578
 579     u->state = STATE_AUTH;
 580     u->latency = 0;
 581
 582     if (!(espeaker = getenv("ESPEAKER")))
 583         espeaker = ESD_UNIX_SOCKET_NAME;
 584
 585     espeaker = pa_modargs_get_value(ma, "server", espeaker);
 586
 587     pa_sink_new_data_init(&data);
 588     data.driver = __FILE__;
 589     data.module = m;
 590     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 591     pa_sink_new_data_set_sample_spec(&data, &ss);
 592     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, espeaker);
 593     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_API, "esd");
 594     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "EsounD Output on %s", espeaker);
 595
 596     if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 597         pa_log("Invalid properties");
 598         pa_sink_new_data_done(&data);
 599         goto fail;
 600     }
 601
 602     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY|PA_SINK_NETWORK);
 603     pa_sink_new_data_done(&data);
 604
 605     if (!u->sink) {
 606         pa_log("Failed to create sink.");
 607         goto fail;
 608     }
 609
 610     u->sink->parent.process_msg = sink_process_msg;
 611     u->sink->userdata = u;
 612
 613     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 614     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 615
 616     if (!(u->client = pa_socket_client_new_string(u->core->mainloop, true, espeaker, ESD_DEFAULT_PORT))) {
 617         pa_log("Failed to connect to server.");
 618         goto fail;
 619     }
 620
 621     pa_socket_client_set_callback(u->client, on_connection, u);
 622
 623     /* Prepare the initial request */
 624     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 625     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), true, u->write_data, ESD_KEY_LEN) < 0) {
 626         pa_log("Failed to load cookie");
 627         goto fail;
 628     }
 629
 630     key = ESD_ENDIAN_KEY;
 631     memcpy((uint8_t*) u->write_data + ESD_KEY_LEN, &key, sizeof(key));
 632
 633     /* Reserve space for the response */
 634     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 635
 636     if (!(u->thread = pa_thread_new("esound-sink", thread_func, u))) {
 637         pa_log("Failed to create thread.");
 638         goto fail;
 639     }
 640
 641     pa_sink_put(u->sink);
 642
 643     pa_modargs_free(ma);
 644
 645     return 0;
 646
 647 fail:
 648     if (ma)
 649         pa_modargs_free(ma);
 650
 651     pa__done(m);
 652
 653     return -1;
 654 }
 655
 656 int pa__get_n_used(pa_module *m) {
 657     struct userdata *u;
 658
 659     pa_assert(m);
 660     pa_assert_se(u = m->userdata);
 661
 662     return pa_sink_linked_by(u->sink);
 663 }
 664
 665 void pa__done(pa_module*m) {
 666     struct userdata *u;
 667     pa_assert(m);
 668
 669     if (!(u = m->userdata))
 670         return;
 671
 672     if (u->sink)
 673         pa_sink_unlink(u->sink);
 674
 675     if (u->thread) {
 676         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 677         pa_thread_free(u->thread);
 678     }
 679
 680     pa_thread_mq_done(&u->thread_mq);
 681
 682     if (u->sink)
 683         pa_sink_unref(u->sink);
 684
 685     if (u->io)
 686         pa_iochannel_free(u->io);
 687
 688     if (u->rtpoll_item)
 689         pa_rtpoll_item_free(u->rtpoll_item);
 690
 691     if (u->rtpoll)
 692         pa_rtpoll_free(u->rtpoll);
 693
 694     if (u->memchunk.memblock)
 695         pa_memblock_unref(u->memchunk.memblock);
 696
 697     if (u->client)
 698         pa_socket_client_unref(u->client);
 699
 700     pa_xfree(u->read_data);
 701     pa_xfree(u->write_data);
 702
 703     if (u->smoother)
 704         pa_smoother_free(u->smoother);
 705
 706     if (u->fd >= 0)
 707         pa_close(u->fd);
 708
 709     pa_xfree(u);
 710 }