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                     ;
 160             }
 161
 162             break;
 163
 164         case PA_SINK_MESSAGE_GET_LATENCY: {
 165             pa_usec_t w, r;
 166
 167             r = pa_smoother_get(u->smoother, pa_rtclock_usec());
 168             w = pa_bytes_to_usec((uint64_t) u->offset + u->memchunk.length, &u->sink->sample_spec);
 169
 170             *((pa_usec_t*) data) = w > r ? w - r : 0;
 171             break;
 172         }
 173
 174         case SINK_MESSAGE_PASS_SOCKET: {
 175             struct pollfd *pollfd;
 176
 177             pa_assert(!u->rtpoll_item);
 178
 179             u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 180             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 181             pollfd->fd = u->fd;
 182             pollfd->events = pollfd->revents = 0;
 183
 184             return 0;
 185         }
 186     }
 187
 188     return pa_sink_process_msg(o, code, data, offset, chunk);
 189 }
 190
 191 static void thread_func(void *userdata) {
 192     struct userdata *u = userdata;
 193     int write_type = 0;
 194
 195     pa_assert(u);
 196
 197     pa_log_debug("Thread starting up");
 198
 199     pa_thread_mq_install(&u->thread_mq);
 200     pa_rtpoll_install(u->rtpoll);
 201
 202     pa_smoother_set_time_offset(u->smoother, pa_rtclock_usec());
 203
 204     for (;;) {
 205         int ret;
 206
 207         if (PA_SINK_IS_OPENED(u->sink->thread_info.state))
 208             if (u->sink->thread_info.rewind_requested)
 209                 pa_sink_process_rewind(u->sink, 0);
 210
 211         if (u->rtpoll_item) {
 212             struct pollfd *pollfd;
 213             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 214
 215             /* Render some data and write it to the fifo */
 216             if (PA_SINK_IS_OPENED(u->sink->thread_info.state) && pollfd->revents) {
 217                 pa_usec_t usec;
 218                 int64_t n;
 219
 220                 for (;;) {
 221                     ssize_t l;
 222                     void *p;
 223
 224                     if (u->memchunk.length <= 0)
 225                         pa_sink_render(u->sink, u->block_size, &u->memchunk);
 226
 227                     pa_assert(u->memchunk.length > 0);
 228
 229                     p = pa_memblock_acquire(u->memchunk.memblock);
 230                     l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &write_type);
 231                     pa_memblock_release(u->memchunk.memblock);
 232
 233                     pa_assert(l != 0);
 234
 235                     if (l < 0) {
 236
 237                         if (errno == EINTR)
 238                             continue;
 239                         else if (errno == EAGAIN) {
 240
 241                             /* OK, we filled all socket buffers up
 242                              * now. */
 243                             goto filled_up;
 244
 245                         } else {
 246                             pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 247                             goto fail;
 248                         }
 249
 250                     } else {
 251                         u->offset += l;
 252
 253                         u->memchunk.index += (size_t) l;
 254                         u->memchunk.length -= (size_t) l;
 255
 256                         if (u->memchunk.length <= 0) {
 257                             pa_memblock_unref(u->memchunk.memblock);
 258                             pa_memchunk_reset(&u->memchunk);
 259                         }
 260
 261                         pollfd->revents = 0;
 262
 263                         if (u->memchunk.length > 0)
 264
 265                             /* OK, we wrote less that we asked for,
 266                              * hence we can assume that the socket
 267                              * buffers are full now */
 268                             goto filled_up;
 269                     }
 270                 }
 271
 272             filled_up:
 273
 274                 /* At this spot we know that the socket buffers are
 275                  * fully filled up. This is the best time to estimate
 276                  * the playback position of the server */
 277
 278                 n = u->offset;
 279
 280 #ifdef SIOCOUTQ
 281                 {
 282                     int l;
 283                     if (ioctl(u->fd, SIOCOUTQ, &l) >= 0 && l > 0)
 284                         n -= l;
 285                 }
 286 #endif
 287
 288                 usec = pa_bytes_to_usec((uint64_t) n, &u->sink->sample_spec);
 289
 290                 if (usec > u->latency)
 291                     usec -= u->latency;
 292                 else
 293                     usec = 0;
 294
 295                 pa_smoother_put(u->smoother, pa_rtclock_usec(), usec);
 296             }
 297
 298             /* Hmm, nothing to do. Let's sleep */
 299             pollfd->events = (short) (PA_SINK_IS_OPENED(u->sink->thread_info.state) ? POLLOUT : 0);
 300         }
 301
 302         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 303             goto fail;
 304
 305         if (ret == 0)
 306             goto finish;
 307
 308         if (u->rtpoll_item) {
 309             struct pollfd* pollfd;
 310
 311             pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 312
 313             if (pollfd->revents & ~POLLOUT) {
 314                 pa_log("FIFO shutdown.");
 315                 goto fail;
 316             }
 317         }
 318     }
 319
 320 fail:
 321     /* If this was no regular exit from the loop we have to continue
 322      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 323     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 324     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 325
 326 finish:
 327     pa_log_debug("Thread shutting down");
 328 }
 329
 330 static int do_write(struct userdata *u) {
 331     ssize_t r;
 332     pa_assert(u);
 333
 334     if (!pa_iochannel_is_writable(u->io))
 335         return 0;
 336
 337     if (u->write_data) {
 338         pa_assert(u->write_index < u->write_length);
 339
 340         if ((r = pa_iochannel_write(u->io, (uint8_t*) u->write_data + u->write_index, u->write_length - u->write_index)) <= 0) {
 341             pa_log("write() failed: %s", pa_cstrerror(errno));
 342             return -1;
 343         }
 344
 345         u->write_index += (size_t) r;
 346         pa_assert(u->write_index <= u->write_length);
 347
 348         if (u->write_index == u->write_length) {
 349             pa_xfree(u->write_data);
 350             u->write_data = NULL;
 351             u->write_index = u->write_length = 0;
 352         }
 353     }
 354
 355     if (!u->write_data && u->state == STATE_PREPARE) {
 356         /* OK, we're done with sending all control data we need to, so
 357          * let's hand the socket over to the IO thread now */
 358
 359         pa_assert(u->fd < 0);
 360         u->fd = pa_iochannel_get_send_fd(u->io);
 361
 362         pa_iochannel_set_noclose(u->io, TRUE);
 363         pa_iochannel_free(u->io);
 364         u->io = NULL;
 365
 366         pa_make_tcp_socket_low_delay(u->fd);
 367
 368         pa_log_debug("Connection authenticated, handing fd to IO thread...");
 369
 370         pa_asyncmsgq_post(u->thread_mq.inq, PA_MSGOBJECT(u->sink), SINK_MESSAGE_PASS_SOCKET, NULL, 0, NULL, NULL);
 371         u->state = STATE_RUNNING;
 372     }
 373
 374     return 0;
 375 }
 376
 377 static int handle_response(struct userdata *u) {
 378     pa_assert(u);
 379
 380     switch (u->state) {
 381
 382         case STATE_AUTH:
 383             pa_assert(u->read_length == sizeof(int32_t));
 384
 385             /* Process auth data */
 386             if (!*(int32_t*) u->read_data) {
 387                 pa_log("Authentication failed: %s", pa_cstrerror(errno));
 388                 return -1;
 389             }
 390
 391             /* Request latency data */
 392             pa_assert(!u->write_data);
 393             *(int32_t*) (u->write_data = pa_xmalloc(u->write_length = sizeof(int32_t))) = ESD_PROTO_LATENCY;
 394
 395             u->write_index = 0;
 396             u->state = STATE_LATENCY;
 397
 398             /* Space for next response */
 399             pa_assert(u->read_length >= sizeof(int32_t));
 400             u->read_index = 0;
 401             u->read_length = sizeof(int32_t);
 402
 403             break;
 404
 405         case STATE_LATENCY: {
 406             int32_t *p;
 407             pa_assert(u->read_length == sizeof(int32_t));
 408
 409             /* Process latency info */
 410             u->latency = (pa_usec_t) ((double) (*(int32_t*) u->read_data) * 1000000 / 44100);
 411             if (u->latency > 10000000) {
 412                 pa_log_warn("Invalid latency information received from server");
 413                 u->latency = 0;
 414             }
 415
 416             /* Create stream */
 417             pa_assert(!u->write_data);
 418             p = u->write_data = pa_xmalloc0(u->write_length = sizeof(int32_t)*3+ESD_NAME_MAX);
 419             *(p++) = ESD_PROTO_STREAM_PLAY;
 420             *(p++) = u->format;
 421             *(p++) = u->rate;
 422             pa_strlcpy((char*) p, "PulseAudio Tunnel", ESD_NAME_MAX);
 423
 424             u->write_index = 0;
 425             u->state = STATE_PREPARE;
 426
 427             /* Don't read any further */
 428             pa_xfree(u->read_data);
 429             u->read_data = NULL;
 430             u->read_index = u->read_length = 0;
 431
 432             break;
 433         }
 434
 435         default:
 436             pa_assert_not_reached();
 437     }
 438
 439     return 0;
 440 }
 441
 442 static int do_read(struct userdata *u) {
 443     pa_assert(u);
 444
 445     if (!pa_iochannel_is_readable(u->io))
 446         return 0;
 447
 448     if (u->state == STATE_AUTH || u->state == STATE_LATENCY) {
 449         ssize_t r;
 450
 451         if (!u->read_data)
 452             return 0;
 453
 454         pa_assert(u->read_index < u->read_length);
 455
 456         if ((r = pa_iochannel_read(u->io, (uint8_t*) u->read_data + u->read_index, u->read_length - u->read_index)) <= 0) {
 457             pa_log("read() failed: %s", r < 0 ? pa_cstrerror(errno) : "EOF");
 458             return -1;
 459         }
 460
 461         u->read_index += (size_t) r;
 462         pa_assert(u->read_index <= u->read_length);
 463
 464         if (u->read_index == u->read_length)
 465             return handle_response(u);
 466     }
 467
 468     return 0;
 469 }
 470
 471 static void io_callback(pa_iochannel *io, void*userdata) {
 472     struct userdata *u = userdata;
 473     pa_assert(u);
 474
 475     if (do_read(u) < 0 || do_write(u) < 0) {
 476
 477         if (u->io) {
 478             pa_iochannel_free(u->io);
 479             u->io = NULL;
 480         }
 481
 482         pa_module_unload_request(u->module, TRUE);
 483     }
 484 }
 485
 486 static void on_connection(pa_socket_client *c, pa_iochannel*io, void *userdata) {
 487     struct userdata *u = userdata;
 488
 489     pa_socket_client_unref(u->client);
 490     u->client = NULL;
 491
 492     if (!io) {
 493         pa_log("Connection failed: %s", pa_cstrerror(errno));
 494         pa_module_unload_request(u->module, TRUE);
 495         return;
 496     }
 497
 498     pa_assert(!u->io);
 499     u->io = io;
 500     pa_iochannel_set_callback(u->io, io_callback, u);
 501
 502     pa_log_debug("Connection established, authenticating ...");
 503 }
 504
 505 int pa__init(pa_module*m) {
 506     struct userdata *u = NULL;
 507     pa_sample_spec ss;
 508     pa_modargs *ma = NULL;
 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, 10);
 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 = (int32_t) 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     if (!(espeaker = getenv("ESPEAKER")))
 558         espeaker = ESD_UNIX_SOCKET_NAME;
 559
 560     espeaker = pa_modargs_get_value(ma, "server", espeaker);
 561
 562     pa_sink_new_data_init(&data);
 563     data.driver = __FILE__;
 564     data.module = m;
 565     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 566     pa_sink_new_data_set_sample_spec(&data, &ss);
 567     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, espeaker);
 568     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Esound sink '%s'", espeaker);
 569
 570     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY|PA_SINK_NETWORK);
 571     pa_sink_new_data_done(&data);
 572
 573     if (!u->sink) {
 574         pa_log("Failed to create sink.");
 575         goto fail;
 576     }
 577
 578     u->sink->parent.process_msg = sink_process_msg;
 579     u->sink->userdata = u;
 580
 581     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 582     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 583
 584     if (!(u->client = pa_socket_client_new_string(u->core->mainloop, espeaker, ESD_DEFAULT_PORT))) {
 585         pa_log("Failed to connect to server.");
 586         goto fail;
 587     }
 588
 589     pa_socket_client_set_callback(u->client, on_connection, u);
 590
 591     /* Prepare the initial request */
 592     u->write_data = pa_xmalloc(u->write_length = ESD_KEY_LEN + sizeof(int32_t));
 593     if (pa_authkey_load_auto(pa_modargs_get_value(ma, "cookie", ".esd_auth"), u->write_data, ESD_KEY_LEN) < 0) {
 594         pa_log("Failed to load cookie");
 595         goto fail;
 596     }
 597
 598     key = ESD_ENDIAN_KEY;
 599     memcpy((uint8_t*) u->write_data + ESD_KEY_LEN, &key, sizeof(key));
 600
 601     /* Reserve space for the response */
 602     u->read_data = pa_xmalloc(u->read_length = sizeof(int32_t));
 603
 604     if (!(u->thread = pa_thread_new(thread_func, u))) {
 605         pa_log("Failed to create thread.");
 606         goto fail;
 607     }
 608
 609     pa_sink_put(u->sink);
 610
 611     pa_modargs_free(ma);
 612
 613     return 0;
 614
 615 fail:
 616     if (ma)
 617         pa_modargs_free(ma);
 618
 619     pa__done(m);
 620
 621     return -1;
 622 }
 623
 624 void pa__done(pa_module*m) {
 625     struct userdata *u;
 626     pa_assert(m);
 627
 628     if (!(u = m->userdata))
 629         return;
 630
 631     if (u->sink)
 632         pa_sink_unlink(u->sink);
 633
 634     if (u->thread) {
 635         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 636         pa_thread_free(u->thread);
 637     }
 638
 639     pa_thread_mq_done(&u->thread_mq);
 640
 641     if (u->sink)
 642         pa_sink_unref(u->sink);
 643
 644     if (u->io)
 645         pa_iochannel_free(u->io);
 646
 647     if (u->rtpoll_item)
 648         pa_rtpoll_item_free(u->rtpoll_item);
 649
 650     if (u->rtpoll)
 651         pa_rtpoll_free(u->rtpoll);
 652
 653     if (u->memchunk.memblock)
 654         pa_memblock_unref(u->memchunk.memblock);
 655
 656     if (u->client)
 657         pa_socket_client_unref(u->client);
 658
 659     pa_xfree(u->read_data);
 660     pa_xfree(u->write_data);
 661
 662     if (u->smoother)
 663         pa_smoother_free(u->smoother);
 664
 665     if (u->fd >= 0)
 666         pa_close(u->fd);
 667
 668     pa_xfree(u);
 669 }