code.delx.au - pulseaudio/blob - src/modules/module-pipe-source.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 <sys/ioctl.h>
  35 #include <sys/poll.h>
  36
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/source.h>
  41 #include <pulsecore/module.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/modargs.h>
  44 #include <pulsecore/log.h>
  45 #include <pulsecore/thread.h>
  46 #include <pulsecore/thread-mq.h>
  47 #include <pulsecore/rtpoll.h>
  48
  49 #include "module-pipe-source-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering");
  52 PA_MODULE_DESCRIPTION("UNIX pipe source");
  53 PA_MODULE_VERSION(PACKAGE_VERSION);
  54 PA_MODULE_LOAD_ONCE(FALSE);
  55 PA_MODULE_USAGE(
  56         "source_name=<name for the source> "
  57         "source_properties=<properties for the source> "
  58         "file=<path of the FIFO> "
  59         "format=<sample format> "
  60         "rate=<sample rate> "
  61         "channels=<number of channels> "
  62         "channel_map=<channel map>");
  63
  64 #define DEFAULT_FILE_NAME "/tmp/music.input"
  65 #define DEFAULT_SOURCE_NAME "fifo_input"
  66
  67 struct userdata {
  68     pa_core *core;
  69     pa_module *module;
  70     pa_source *source;
  71
  72     pa_thread *thread;
  73     pa_thread_mq thread_mq;
  74     pa_rtpoll *rtpoll;
  75
  76     char *filename;
  77     int fd;
  78
  79     pa_memchunk memchunk;
  80
  81     pa_rtpoll_item *rtpoll_item;
  82 };
  83
  84 static const char* const valid_modargs[] = {
  85     "source_name",
  86     "source_properties",
  87     "file",
  88     "format",
  89     "rate",
  90     "channels",
  91     "channel_map",
  92     NULL
  93 };
  94
  95 static int source_process_msg(
  96         pa_msgobject *o,
  97         int code,
  98         void *data,
  99         int64_t offset,
 100         pa_memchunk *chunk) {
 101
 102     struct userdata *u = PA_SOURCE(o)->userdata;
 103
 104     switch (code) {
 105
 106         case PA_SOURCE_MESSAGE_GET_LATENCY: {
 107             size_t n = 0;
 108             int l;
 109
 110 #ifdef FIONREAD
 111             if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0)
 112                 n = (size_t) l;
 113 #endif
 114
 115             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->source->sample_spec);
 116             return 0;
 117         }
 118     }
 119
 120     return pa_source_process_msg(o, code, data, offset, chunk);
 121 }
 122
 123 static void thread_func(void *userdata) {
 124     struct userdata *u = userdata;
 125     int read_type = 0;
 126
 127     pa_assert(u);
 128
 129     pa_log_debug("Thread starting up");
 130
 131     pa_thread_mq_install(&u->thread_mq);
 132     pa_rtpoll_install(u->rtpoll);
 133
 134     for (;;) {
 135         int ret;
 136         struct pollfd *pollfd;
 137
 138         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 139
 140         /* Try to read some data and pass it on to the source driver */
 141         if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd->revents) {
 142             ssize_t l;
 143             void *p;
 144
 145             if (!u->memchunk.memblock) {
 146                 u->memchunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
 147                 u->memchunk.index = u->memchunk.length = 0;
 148             }
 149
 150             pa_assert(pa_memblock_get_length(u->memchunk.memblock) > u->memchunk.index);
 151
 152             p = pa_memblock_acquire(u->memchunk.memblock);
 153             l = pa_read(u->fd, (uint8_t*) p + u->memchunk.index, pa_memblock_get_length(u->memchunk.memblock) - u->memchunk.index, &read_type);
 154             pa_memblock_release(u->memchunk.memblock);
 155
 156             pa_assert(l != 0); /* EOF cannot happen, since we opened the fifo for both reading and writing */
 157
 158             if (l < 0) {
 159
 160                 if (errno == EINTR)
 161                     continue;
 162                 else if (errno != EAGAIN) {
 163                     pa_log("Faile to read data from FIFO: %s", pa_cstrerror(errno));
 164                     goto fail;
 165                 }
 166
 167             } else {
 168
 169                 u->memchunk.length = (size_t) l;
 170                 pa_source_post(u->source, &u->memchunk);
 171                 u->memchunk.index += (size_t) l;
 172
 173                 if (u->memchunk.index >= pa_memblock_get_length(u->memchunk.memblock)) {
 174                     pa_memblock_unref(u->memchunk.memblock);
 175                     pa_memchunk_reset(&u->memchunk);
 176                 }
 177
 178                 pollfd->revents = 0;
 179             }
 180         }
 181
 182         /* Hmm, nothing to do. Let's sleep */
 183         pollfd->events = (short) (u->source->thread_info.state == PA_SOURCE_RUNNING ? POLLIN : 0);
 184
 185         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 186             goto fail;
 187
 188         if (ret == 0)
 189             goto finish;
 190
 191         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 192
 193         if (pollfd->revents & ~POLLIN) {
 194             pa_log("FIFO shutdown.");
 195             goto fail;
 196         }
 197     }
 198
 199 fail:
 200     /* If this was no regular exit from the loop we have to continue
 201      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 202     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 203     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 204
 205 finish:
 206     pa_log_debug("Thread shutting down");
 207 }
 208
 209 int pa__init(pa_module*m) {
 210     struct userdata *u;
 211     struct stat st;
 212     pa_sample_spec ss;
 213     pa_channel_map map;
 214     pa_modargs *ma;
 215     struct pollfd *pollfd;
 216     pa_source_new_data data;
 217
 218     pa_assert(m);
 219
 220     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 221         pa_log("failed to parse module arguments.");
 222         goto fail;
 223     }
 224
 225     ss = m->core->default_sample_spec;
 226     map = m->core->default_channel_map;
 227     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 228         pa_log("invalid sample format specification or channel map");
 229         goto fail;
 230     }
 231
 232     m->userdata = u = pa_xnew0(struct userdata, 1);
 233     u->core = m->core;
 234     u->module = m;
 235     pa_memchunk_reset(&u->memchunk);
 236     u->rtpoll = pa_rtpoll_new();
 237     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 238
 239     u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 240
 241     mkfifo(u->filename, 0666);
 242     if ((u->fd = open(u->filename, O_RDWR|O_NOCTTY)) < 0) {
 243         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 244         goto fail;
 245     }
 246
 247     pa_make_fd_cloexec(u->fd);
 248     pa_make_fd_nonblock(u->fd);
 249
 250     if (fstat(u->fd, &st) < 0) {
 251         pa_log("fstat('%s'): %s",u->filename, pa_cstrerror(errno));
 252         goto fail;
 253     }
 254
 255     if (!S_ISFIFO(st.st_mode)) {
 256         pa_log("'%s' is not a FIFO.", u->filename);
 257         goto fail;
 258     }
 259
 260     pa_source_new_data_init(&data);
 261     data.driver = __FILE__;
 262     data.module = m;
 263     pa_source_new_data_set_name(&data, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME));
 264     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename);
 265     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO source %s", u->filename);
 266     pa_source_new_data_set_sample_spec(&data, &ss);
 267     pa_source_new_data_set_channel_map(&data, &map);
 268
 269     if (pa_modargs_get_proplist(ma, "source_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 270         pa_log("Invalid properties");
 271         pa_source_new_data_done(&data);
 272         goto fail;
 273     }
 274
 275     u->source = pa_source_new(m->core, &data, PA_SOURCE_LATENCY);
 276     pa_source_new_data_done(&data);
 277
 278     if (!u->source) {
 279         pa_log("Failed to create source.");
 280         goto fail;
 281     }
 282
 283     u->source->parent.process_msg = source_process_msg;
 284     u->source->userdata = u;
 285
 286     pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
 287     pa_source_set_rtpoll(u->source, u->rtpoll);
 288     pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(PIPE_BUF, &u->source->sample_spec));
 289
 290     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 291     pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 292     pollfd->fd = u->fd;
 293     pollfd->events = pollfd->revents = 0;
 294
 295     if (!(u->thread = pa_thread_new(thread_func, u))) {
 296         pa_log("Failed to create thread.");
 297         goto fail;
 298     }
 299
 300     pa_source_put(u->source);
 301
 302     pa_modargs_free(ma);
 303
 304     return 0;
 305
 306 fail:
 307     if (ma)
 308         pa_modargs_free(ma);
 309
 310     pa__done(m);
 311
 312     return -1;
 313 }
 314
 315 int pa__get_n_used(pa_module *m) {
 316     struct userdata *u;
 317
 318     pa_assert(m);
 319     pa_assert_se(u = m->userdata);
 320
 321     return pa_source_linked_by(u->source);
 322 }
 323
 324 void pa__done(pa_module*m) {
 325     struct userdata *u;
 326
 327     pa_assert(m);
 328
 329     if (!(u = m->userdata))
 330         return;
 331
 332     if (u->source)
 333         pa_source_unlink(u->source);
 334
 335     if (u->thread) {
 336         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 337         pa_thread_free(u->thread);
 338     }
 339
 340     pa_thread_mq_done(&u->thread_mq);
 341
 342     if (u->source)
 343         pa_source_unref(u->source);
 344
 345     if (u->memchunk.memblock)
 346         pa_memblock_unref(u->memchunk.memblock);
 347
 348     if (u->rtpoll_item)
 349         pa_rtpoll_item_free(u->rtpoll_item);
 350
 351     if (u->rtpoll)
 352         pa_rtpoll_free(u->rtpoll);
 353
 354     if (u->filename) {
 355         unlink(u->filename);
 356         pa_xfree(u->filename);
 357     }
 358
 359     if (u->fd >= 0)
 360         pa_assert_se(pa_close(u->fd) == 0);
 361
 362     pa_xfree(u);
 363 }