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
  36 #ifdef HAVE_SYS_FILIO_H
  37 #include <sys/filio.h>
  38 #endif
  39
  40 #include <pulse/xmalloc.h>
  41
  42 #include <pulsecore/core-error.h>
  43 #include <pulsecore/source.h>
  44 #include <pulsecore/module.h>
  45 #include <pulsecore/core-util.h>
  46 #include <pulsecore/modargs.h>
  47 #include <pulsecore/log.h>
  48 #include <pulsecore/thread.h>
  49 #include <pulsecore/thread-mq.h>
  50 #include <pulsecore/rtpoll.h>
  51 #include <pulsecore/poll.h>
  52
  53 #include "module-pipe-source-symdef.h"
  54
  55 PA_MODULE_AUTHOR("Lennart Poettering");
  56 PA_MODULE_DESCRIPTION("UNIX pipe source");
  57 PA_MODULE_VERSION(PACKAGE_VERSION);
  58 PA_MODULE_LOAD_ONCE(FALSE);
  59 PA_MODULE_USAGE(
  60         "source_name=<name for the source> "
  61         "source_properties=<properties for the source> "
  62         "file=<path of the FIFO> "
  63         "format=<sample format> "
  64         "rate=<sample rate> "
  65         "channels=<number of channels> "
  66         "channel_map=<channel map>");
  67
  68 #define DEFAULT_FILE_NAME "/tmp/music.input"
  69 #define DEFAULT_SOURCE_NAME "fifo_input"
  70
  71 struct userdata {
  72     pa_core *core;
  73     pa_module *module;
  74     pa_source *source;
  75
  76     pa_thread *thread;
  77     pa_thread_mq thread_mq;
  78     pa_rtpoll *rtpoll;
  79
  80     char *filename;
  81     int fd;
  82
  83     pa_memchunk memchunk;
  84
  85     pa_rtpoll_item *rtpoll_item;
  86 };
  87
  88 static const char* const valid_modargs[] = {
  89     "source_name",
  90     "source_properties",
  91     "file",
  92     "format",
  93     "rate",
  94     "channels",
  95     "channel_map",
  96     NULL
  97 };
  98
  99 static int source_process_msg(
 100         pa_msgobject *o,
 101         int code,
 102         void *data,
 103         int64_t offset,
 104         pa_memchunk *chunk) {
 105
 106     struct userdata *u = PA_SOURCE(o)->userdata;
 107
 108     switch (code) {
 109
 110         case PA_SOURCE_MESSAGE_GET_LATENCY: {
 111             size_t n = 0;
 112
 113 #ifdef FIONREAD
 114             int l;
 115
 116             if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0)
 117                 n = (size_t) l;
 118 #endif
 119
 120             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->source->sample_spec);
 121             return 0;
 122         }
 123     }
 124
 125     return pa_source_process_msg(o, code, data, offset, chunk);
 126 }
 127
 128 static void thread_func(void *userdata) {
 129     struct userdata *u = userdata;
 130     int read_type = 0;
 131
 132     pa_assert(u);
 133
 134     pa_log_debug("Thread starting up");
 135
 136     pa_thread_mq_install(&u->thread_mq);
 137
 138     for (;;) {
 139         int ret;
 140         struct pollfd *pollfd;
 141
 142         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 143
 144         /* Try to read some data and pass it on to the source driver */
 145         if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd->revents) {
 146             ssize_t l;
 147             void *p;
 148
 149             if (!u->memchunk.memblock) {
 150                 u->memchunk.memblock = pa_memblock_new(u->core->mempool, pa_pipe_buf(u->fd));
 151                 u->memchunk.index = u->memchunk.length = 0;
 152             }
 153
 154             pa_assert(pa_memblock_get_length(u->memchunk.memblock) > u->memchunk.index);
 155
 156             p = pa_memblock_acquire(u->memchunk.memblock);
 157             l = pa_read(u->fd, (uint8_t*) p + u->memchunk.index, pa_memblock_get_length(u->memchunk.memblock) - u->memchunk.index, &read_type);
 158             pa_memblock_release(u->memchunk.memblock);
 159
 160             pa_assert(l != 0); /* EOF cannot happen, since we opened the fifo for both reading and writing */
 161
 162             if (l < 0) {
 163
 164                 if (errno == EINTR)
 165                     continue;
 166                 else if (errno != EAGAIN) {
 167                     pa_log("Failed to read data from FIFO: %s", pa_cstrerror(errno));
 168                     goto fail;
 169                 }
 170
 171             } else {
 172
 173                 u->memchunk.length = (size_t) l;
 174                 pa_source_post(u->source, &u->memchunk);
 175                 u->memchunk.index += (size_t) l;
 176
 177                 if (u->memchunk.index >= pa_memblock_get_length(u->memchunk.memblock)) {
 178                     pa_memblock_unref(u->memchunk.memblock);
 179                     pa_memchunk_reset(&u->memchunk);
 180                 }
 181
 182                 pollfd->revents = 0;
 183             }
 184         }
 185
 186         /* Hmm, nothing to do. Let's sleep */
 187         pollfd->events = (short) (u->source->thread_info.state == PA_SOURCE_RUNNING ? POLLIN : 0);
 188
 189         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 190             goto fail;
 191
 192         if (ret == 0)
 193             goto finish;
 194
 195         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 196
 197         if (pollfd->revents & ~POLLIN) {
 198             pa_log("FIFO shutdown.");
 199             goto fail;
 200         }
 201     }
 202
 203 fail:
 204     /* If this was no regular exit from the loop we have to continue
 205      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 206     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 207     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 208
 209 finish:
 210     pa_log_debug("Thread shutting down");
 211 }
 212
 213 int pa__init(pa_module*m) {
 214     struct userdata *u;
 215     struct stat st;
 216     pa_sample_spec ss;
 217     pa_channel_map map;
 218     pa_modargs *ma;
 219     struct pollfd *pollfd;
 220     pa_source_new_data data;
 221
 222     pa_assert(m);
 223
 224     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 225         pa_log("failed to parse module arguments.");
 226         goto fail;
 227     }
 228
 229     ss = m->core->default_sample_spec;
 230     map = m->core->default_channel_map;
 231     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 232         pa_log("invalid sample format specification or channel map");
 233         goto fail;
 234     }
 235
 236     m->userdata = u = pa_xnew0(struct userdata, 1);
 237     u->core = m->core;
 238     u->module = m;
 239     pa_memchunk_reset(&u->memchunk);
 240     u->rtpoll = pa_rtpoll_new();
 241     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 242
 243     u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 244
 245     mkfifo(u->filename, 0666);
 246     if ((u->fd = pa_open_cloexec(u->filename, O_RDWR, 0)) < 0) {
 247         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 248         goto fail;
 249     }
 250
 251     pa_make_fd_nonblock(u->fd);
 252
 253     if (fstat(u->fd, &st) < 0) {
 254         pa_log("fstat('%s'): %s",u->filename, pa_cstrerror(errno));
 255         goto fail;
 256     }
 257
 258     if (!S_ISFIFO(st.st_mode)) {
 259         pa_log("'%s' is not a FIFO.", u->filename);
 260         goto fail;
 261     }
 262
 263     pa_source_new_data_init(&data);
 264     data.driver = __FILE__;
 265     data.module = m;
 266     pa_source_new_data_set_name(&data, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME));
 267     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename);
 268     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO source %s", u->filename);
 269     pa_source_new_data_set_sample_spec(&data, &ss);
 270     pa_source_new_data_set_channel_map(&data, &map);
 271
 272     if (pa_modargs_get_proplist(ma, "source_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 273         pa_log("Invalid properties");
 274         pa_source_new_data_done(&data);
 275         goto fail;
 276     }
 277
 278     u->source = pa_source_new(m->core, &data, PA_SOURCE_LATENCY);
 279     pa_source_new_data_done(&data);
 280
 281     if (!u->source) {
 282         pa_log("Failed to create source.");
 283         goto fail;
 284     }
 285
 286     u->source->parent.process_msg = source_process_msg;
 287     u->source->userdata = u;
 288
 289     pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
 290     pa_source_set_rtpoll(u->source, u->rtpoll);
 291     pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(PIPE_BUF, &u->source->sample_spec));
 292
 293     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 294     pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 295     pollfd->fd = u->fd;
 296     pollfd->events = pollfd->revents = 0;
 297
 298     if (!(u->thread = pa_thread_new("pipe-source", thread_func, u))) {
 299         pa_log("Failed to create thread.");
 300         goto fail;
 301     }
 302
 303     pa_source_put(u->source);
 304
 305     pa_modargs_free(ma);
 306
 307     return 0;
 308
 309 fail:
 310     if (ma)
 311         pa_modargs_free(ma);
 312
 313     pa__done(m);
 314
 315     return -1;
 316 }
 317
 318 int pa__get_n_used(pa_module *m) {
 319     struct userdata *u;
 320
 321     pa_assert(m);
 322     pa_assert_se(u = m->userdata);
 323
 324     return pa_source_linked_by(u->source);
 325 }
 326
 327 void pa__done(pa_module*m) {
 328     struct userdata *u;
 329
 330     pa_assert(m);
 331
 332     if (!(u = m->userdata))
 333         return;
 334
 335     if (u->source)
 336         pa_source_unlink(u->source);
 337
 338     if (u->thread) {
 339         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 340         pa_thread_free(u->thread);
 341     }
 342
 343     pa_thread_mq_done(&u->thread_mq);
 344
 345     if (u->source)
 346         pa_source_unref(u->source);
 347
 348     if (u->memchunk.memblock)
 349         pa_memblock_unref(u->memchunk.memblock);
 350
 351     if (u->rtpoll_item)
 352         pa_rtpoll_item_free(u->rtpoll_item);
 353
 354     if (u->rtpoll)
 355         pa_rtpoll_free(u->rtpoll);
 356
 357     if (u->filename) {
 358         unlink(u->filename);
 359         pa_xfree(u->filename);
 360     }
 361
 362     if (u->fd >= 0)
 363         pa_assert_se(pa_close(u->fd) == 0);
 364
 365     pa_xfree(u);
 366 }