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