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

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