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 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         /* OK, we're done with sending all control data we need to, so
 358          * let's hand the socket over to the IO thread now */
 359
 360         pa_assert(u->fd < 0);
 361         u->fd = pa_iochannel_get_send_fd(u->io);
 362
 363         pa_iochannel_set_noclose(u->io, TRUE);
 364         pa_iochannel_free(u->io);
 365         u->io = NULL;
 366
 367         pa_make_tcp_socket_low_delay(u->fd);
 368
 369         pa_log_debug("Connection authenticated, handing fd to IO thread...");
 370
 371         pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_PASS_SOCKET, NULL, 0, NULL, NULL);
 372         u->state = STATE_RUNNING;
 373     }
 374
 375     return 0;
 376 }
 377
 378 static int handle_response(struct userdata *u) {
 379     pa_assert(u);
 380
 381     switch (u->state) {
 382
 383         case STATE_AUTH:
 384             pa_assert(u->read_length == sizeof(int32_t));
 385
 386             /* Process auth data */
 387             if (!*(int32_t*) u->read_data) {
 388                 pa_log("Authentication failed: %s", pa_cstrerror(errno));
 389                 return -1;
 390             }
 391
 392             /* Request latency data */
 393             pa_assert(!u->write_data);
 394             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 395
 396             u->write_index = 0;
 397             u->state = STATE_LATENCY;
 398
 399             /* Space for next response */
 400             pa_assert(u->read_length >= sizeof(int32_t));
 401             u->read_index = 0;
 402             u->read_length = sizeof(int32_t);
 403
 404             break;
 405
 406         case STATE_LATENCY: {
 407             int32_t *p;
 408             pa_assert(u->read_length == sizeof(int32_t));
 409
 410             /* Process latency info */
 411             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 412             if (u->latency > 10000000) {
 413                 pa_log_warn("Invalid latency information received from server");
 414                 u->latency = 0;
 415             }
 416
 417             /* Create stream */
 418             pa_assert(!u->write_data);
 419             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 420             *(p++) = ESD_PROTO_STREAM_PLAY;
 421             *(p++) = u->format;
 422             *(p++) = u->rate;
 423             pa_strlcpy((char*) p, "PulseAudio Tunnel", ESD_NAME_MAX);
 424
 425             u->write_index = 0;
 426             u->state = STATE_PREPARE;
 427
 428             /* Don't read any further */
 429             pa_xfree(u->read_data);
 430             u->read_data = NULL;
 431             u->read_index = u->read_length = 0;
 432
 433             break;
 434         }
 435
 436         default:
 437             pa_assert_not_reached();
 438     }
 439
 440     return 0;
 441 }
 442
 443 static int do_read(struct userdata *u) {
 444     pa_assert(u);
 445
 446     if (!pa_iochannel_is_readable(u->io))
 447         return 0;
 448
 449     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 450         ssize_t r;
 451
 452         if (!u->read_data)
 453             return 0;
 454
 455         pa_assert(u->read_index < u->read_length);
 456
 457         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 458             pa_log("read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 459             return -1;
 460         }
 461
 462         u->read_index += (size_t) r;
 463         pa_assert(u->read_index <= u->read_length);
 464
 465         if (u->read_index == u->read_length)
 466             return handle_response(u);
 467     }
 468
 469     return 0;
 470 }
 471
 472 static void io_callback(pa_iochannel *io, void*userdata) {
 473     struct userdata *u = userdata;
 474     pa_assert(u);
 475
 476     if (do_read(u) < 0 || do_write(u) < 0) {
 477
 478         if (u->io) {
 479             pa_iochannel_free(u->io);
 480             u->io = NULL;
 481         }
 482
 483         pa_module_unload_request(u->module, TRUE);
 484     }
 485 }
 486
 487 static void on_connection(pa_socket_client *c, pa_iochannel*io, void *userdata) {
 488     struct userdata *u = userdata;
 489
 490     pa_socket_client_unref(u->client);
 491     u->client = NULL;
 492
 493     if (!io) {
 494         pa_log("Connection failed: %s", pa_cstrerror(errno));
 495         pa_module_unload_request(u->module, TRUE);
 496         return;
 497     }
 498
 499     pa_assert(!u->io);
 500     u->io = io;
 501     pa_iochannel_set_callback(u->io, io_callback, u);
 502
 503     pa_log_debug("Connection established, authenticating ...");
 504 }
 505
 506 int pa__init(pa_module*m) {
 507     struct userdata *u = NULL;
 508     pa_sample_spec ss;
 509     pa_modargs *ma = NULL;
 510     const char *espeaker;
 511     uint32_t key;
 512     pa_sink_new_data data;
 513
 514     pa_assert(m);
 515
 516     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 517         pa_log("failed to parse module arguments");
 518         goto fail;
 519     }
 520
 521     ss = m->core->default_sample_spec;
 522     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 523         pa_log("invalid sample format specification");
 524         goto fail;
 525     }
 526
 527     if ((ss.format != PA_SAMPLE_U8 && ss.format != PA_SAMPLE_S16NE) ||
 528         (ss.channels > 2)) {
 529         pa_log("esound sample type support is limited to mono/stereo and U8 or S16NE sample data");
 530         goto fail;
 531     }
 532
 533     u = pa_xnew0(struct userdata, 1);
 534     u->core = m->core;
 535     u->module = m;
 536     m->userdata = u;
 537     u->fd = -1;
 538     u->smoother = pa_smoother_new(PA_USEC_PER_SEC, PA_USEC_PER_SEC*2, TRUE, 10);
 539     pa_memchunk_reset(&u->memchunk);
 540     u->offset = 0;
 541
 542     u->rtpoll = pa_rtpoll_new();
 543     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 544     u->rtpoll_item = NULL;
 545
 546     u->format =
 547         (ss.format == PA_SAMPLE_U8 ? ESD_BITS8 : ESD_BITS16) |
 548         (ss.channels == 2 ? ESD_STEREO : ESD_MONO);
 549     u->rate = (int32_t) ss.rate;
 550     u->block_size = pa_usec_to_bytes(PA_USEC_PER_SEC/20, &ss);
 551
 552     u->read_data = u->write_data = NULL;
 553     u->read_index = u->write_index = u->read_length = u->write_length = 0;
 554
 555     u->state = STATE_AUTH;
 556     u->latency = 0;
 557
 558     if (!(espeaker = getenv("ESPEAKER")))
 559         espeaker = ESD_UNIX_SOCKET_NAME;
 560
 561     espeaker = pa_modargs_get_value(ma, "server", espeaker);
 562
 563     pa_sink_new_data_init(&data);
 564     data.driver = __FILE__;
 565     data.module = m;
 566     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 567     pa_sink_new_data_set_sample_spec(&data, &ss);
 568     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, espeaker);
 569     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Esound sink '%s'", espeaker);
 570
 571     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY|PA_SINK_NETWORK);
 572     pa_sink_new_data_done(&data);
 573
 574     if (!u->sink) {
 575         pa_log("Failed to create sink.");
 576         goto fail;
 577     }
 578
 579     u->sink->parent.process_msg = sink_process_msg;
 580     u->sink->userdata = u;
 581
 582     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 583     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 584
 585     if (!(u->client = pa_socket_client_new_string(u->core->mainloop, espeaker, ESD_DEFAULT_PORT))) {
 586         pa_log("Failed to connect to server.");
 587         goto fail;
 588     }
 589
 590     pa_socket_client_set_callback(u->client, on_connection, u);
 591
 592     /* Prepare the initial request */
 593     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 594     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), u->write_data, ESD_KEY_LEN) < 0) {
 595         pa_log("Failed to load cookie");
 596         goto fail;
 597     }
 598
 599     key = ESD_ENDIAN_KEY;
 600     memcpy((uint8_t*) u->write_data + ESD_KEY_LEN, &key, sizeof(key));
 601
 602     /* Reserve space for the response */
 603     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 604
 605     if (!(u->thread = pa_thread_new(thread_func, u))) {
 606         pa_log("Failed to create thread.");
 607         goto fail;
 608     }
 609
 610     pa_sink_put(u->sink);
 611
 612     pa_modargs_free(ma);
 613
 614     return 0;
 615
 616 fail:
 617     if (ma)
 618         pa_modargs_free(ma);
 619
 620     pa__done(m);
 621
 622     return -1;
 623 }
 624
 625 int pa__get_n_used(pa_module *m) {
 626     struct userdata *u;
 627
 628     pa_assert(m);
 629     pa_assert_se(u = m->userdata);
 630
 631     return pa_sink_linked_by(u->sink);
 632 }
 633
 634 void pa__done(pa_module*m) {
 635     struct userdata *u;
 636     pa_assert(m);
 637
 638     if (!(u = m->userdata))
 639         return;
 640
 641     if (u->sink)
 642         pa_sink_unlink(u->sink);
 643
 644     if (u->thread) {
 645         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 646         pa_thread_free(u->thread);
 647     }
 648
 649     pa_thread_mq_done(&u->thread_mq);
 650
 651     if (u->sink)
 652         pa_sink_unref(u->sink);
 653
 654     if (u->io)
 655         pa_iochannel_free(u->io);
 656
 657     if (u->rtpoll_item)
 658         pa_rtpoll_item_free(u->rtpoll_item);
 659
 660     if (u->rtpoll)
 661         pa_rtpoll_free(u->rtpoll);
 662
 663     if (u->memchunk.memblock)
 664         pa_memblock_unref(u->memchunk.memblock);
 665
 666     if (u->client)
 667         pa_socket_client_unref(u->client);
 668
 669     pa_xfree(u->read_data);
 670     pa_xfree(u->write_data);
 671
 672     if (u->smoother)
 673         pa_smoother_free(u->smoother);
 674
 675     if (u->fd >= 0)
 676         pa_close(u->fd);
 677
 678     pa_xfree(u);
 679 }