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 <fcntl.h>
  31 #include <unistd.h>
  32 #include <sys/ioctl.h>
  33
  34 #ifdef HAVE_SYS_FILIO_H
  35 #include <sys/filio.h>
  36 #endif
  37
  38 #include <pulse/xmalloc.h>
  39
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/source.h>
  42 #include <pulsecore/module.h>
  43 #include <pulsecore/core-util.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/log.h>
  46 #include <pulsecore/thread.h>
  47 #include <pulsecore/thread-mq.h>
  48 #include <pulsecore/rtpoll.h>
  49 #include <pulsecore/poll.h>
  50
  51 #include "module-pipe-source-symdef.h"
  52
  53 PA_MODULE_AUTHOR("Lennart Poettering");
  54 PA_MODULE_DESCRIPTION("UNIX pipe source");
  55 PA_MODULE_VERSION(PACKAGE_VERSION);
  56 PA_MODULE_LOAD_ONCE(FALSE);
  57 PA_MODULE_USAGE(
  58         "source_name=<name for the source> "
  59         "source_properties=<properties for the source> "
  60         "file=<path of the FIFO> "
  61         "format=<sample format> "
  62         "rate=<sample rate> "
  63         "channels=<number of channels> "
  64         "channel_map=<channel map>");
  65
  66 #define DEFAULT_FILE_NAME "/tmp/music.input"
  67 #define DEFAULT_SOURCE_NAME "fifo_input"
  68
  69 struct userdata {
  70     pa_core *core;
  71     pa_module *module;
  72     pa_source *source;
  73
  74     pa_thread *thread;
  75     pa_thread_mq thread_mq;
  76     pa_rtpoll *rtpoll;
  77
  78     char *filename;
  79     int fd;
  80
  81     pa_memchunk memchunk;
  82
  83     pa_rtpoll_item *rtpoll_item;
  84 };
  85
  86 static const char* const valid_modargs[] = {
  87     "source_name",
  88     "source_properties",
  89     "file",
  90     "format",
  91     "rate",
  92     "channels",
  93     "channel_map",
  94     NULL
  95 };
  96
  97 static int source_process_msg(
  98         pa_msgobject *o,
  99         int code,
 100         void *data,
 101         int64_t offset,
 102         pa_memchunk *chunk) {
 103
 104     struct userdata *u = PA_SOURCE(o)->userdata;
 105
 106     switch (code) {
 107
 108         case PA_SOURCE_MESSAGE_GET_LATENCY: {
 109             size_t n = 0;
 110
 111 #ifdef FIONREAD
 112             int l;
 113
 114             if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0)
 115                 n = (size_t) l;
 116 #endif
 117
 118             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->source->sample_spec);
 119             return 0;
 120         }
 121     }
 122
 123     return pa_source_process_msg(o, code, data, offset, chunk);
 124 }
 125
 126 static void thread_func(void *userdata) {
 127     struct userdata *u = userdata;
 128     int read_type = 0;
 129
 130     pa_assert(u);
 131
 132     pa_log_debug("Thread starting up");
 133
 134     pa_thread_mq_install(&u->thread_mq);
 135
 136     for (;;) {
 137         int ret;
 138         struct pollfd *pollfd;
 139
 140         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 141
 142         /* Try to read some data and pass it on to the source driver */
 143         if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd->revents) {
 144             ssize_t l;
 145             void *p;
 146
 147             if (!u->memchunk.memblock) {
 148                 u->memchunk.memblock = pa_memblock_new(u->core->mempool, pa_pipe_buf(u->fd));
 149                 u->memchunk.index = u->memchunk.length = 0;
 150             }
 151
 152             pa_assert(pa_memblock_get_length(u->memchunk.memblock) > u->memchunk.index);
 153
 154             p = pa_memblock_acquire(u->memchunk.memblock);
 155             l = pa_read(u->fd, (uint8_t*) p + u->memchunk.index, pa_memblock_get_length(u->memchunk.memblock) - u->memchunk.index, &read_type);
 156             pa_memblock_release(u->memchunk.memblock);
 157
 158             pa_assert(l != 0); /* EOF cannot happen, since we opened the fifo for both reading and writing */
 159
 160             if (l < 0) {
 161
 162                 if (errno == EINTR)
 163                     continue;
 164                 else if (errno != EAGAIN) {
 165                     pa_log("Failed to read data from FIFO: %s", pa_cstrerror(errno));
 166                     goto fail;
 167                 }
 168
 169             } else {
 170
 171                 u->memchunk.length = (size_t) l;
 172                 pa_source_post(u->source, &u->memchunk);
 173                 u->memchunk.index += (size_t) l;
 174
 175                 if (u->memchunk.index >= pa_memblock_get_length(u->memchunk.memblock)) {
 176                     pa_memblock_unref(u->memchunk.memblock);
 177                     pa_memchunk_reset(&u->memchunk);
 178                 }
 179
 180                 pollfd->revents = 0;
 181             }
 182         }
 183
 184         /* Hmm, nothing to do. Let's sleep */
 185         pollfd->events = (short) (u->source->thread_info.state == PA_SOURCE_RUNNING ? POLLIN : 0);
 186
 187         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 188             goto fail;
 189
 190         if (ret == 0)
 191             goto finish;
 192
 193         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 194
 195         if (pollfd->revents & ~POLLIN) {
 196             pa_log("FIFO shutdown.");
 197             goto fail;
 198         }
 199     }
 200
 201 fail:
 202     /* If this was no regular exit from the loop we have to continue
 203      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 204     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 205     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 206
 207 finish:
 208     pa_log_debug("Thread shutting down");
 209 }
 210
 211 int pa__init(pa_module*m) {
 212     struct userdata *u;
 213     struct stat st;
 214     pa_sample_spec ss;
 215     pa_channel_map map;
 216     pa_modargs *ma;
 217     struct pollfd *pollfd;
 218     pa_source_new_data data;
 219
 220     pa_assert(m);
 221
 222     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 223         pa_log("failed to parse module arguments.");
 224         goto fail;
 225     }
 226
 227     ss = m->core->default_sample_spec;
 228     map = m->core->default_channel_map;
 229     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 230         pa_log("invalid sample format specification or channel map");
 231         goto fail;
 232     }
 233
 234     m->userdata = u = pa_xnew0(struct userdata, 1);
 235     u->core = m->core;
 236     u->module = m;
 237     pa_memchunk_reset(&u->memchunk);
 238     u->rtpoll = pa_rtpoll_new();
 239     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 240
 241     u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 242
 243     mkfifo(u->filename, 0666);
 244     if ((u->fd = pa_open_cloexec(u->filename, O_RDWR, 0)) < 0) {
 245         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 246         goto fail;
 247     }
 248
 249     pa_make_fd_nonblock(u->fd);
 250
 251     if (fstat(u->fd, &st) < 0) {
 252         pa_log("fstat('%s'): %s",u->filename, pa_cstrerror(errno));
 253         goto fail;
 254     }
 255
 256     if (!S_ISFIFO(st.st_mode)) {
 257         pa_log("'%s' is not a FIFO.", u->filename);
 258         goto fail;
 259     }
 260
 261     pa_source_new_data_init(&data);
 262     data.driver = __FILE__;
 263     data.module = m;
 264     pa_source_new_data_set_name(&data, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME));
 265     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename);
 266     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO source %s", u->filename);
 267     pa_source_new_data_set_sample_spec(&data, &ss);
 268     pa_source_new_data_set_channel_map(&data, &map);
 269
 270     if (pa_modargs_get_proplist(ma, "source_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 271         pa_log("Invalid properties");
 272         pa_source_new_data_done(&data);
 273         goto fail;
 274     }
 275
 276     u->source = pa_source_new(m->core, &data, PA_SOURCE_LATENCY);
 277     pa_source_new_data_done(&data);
 278
 279     if (!u->source) {
 280         pa_log("Failed to create source.");
 281         goto fail;
 282     }
 283
 284     u->source->parent.process_msg = source_process_msg;
 285     u->source->userdata = u;
 286
 287     pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
 288     pa_source_set_rtpoll(u->source, u->rtpoll);
 289     pa_source_set_fixed_latency(u->source, pa_bytes_to_usec(PIPE_BUF, &u->source->sample_spec));
 290
 291     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 292     pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 293     pollfd->fd = u->fd;
 294     pollfd->events = pollfd->revents = 0;
 295
 296     if (!(u->thread = pa_thread_new("pipe-source", thread_func, u))) {
 297         pa_log("Failed to create thread.");
 298         goto fail;
 299     }
 300
 301     pa_source_put(u->source);
 302
 303     pa_modargs_free(ma);
 304
 305     return 0;
 306
 307 fail:
 308     if (ma)
 309         pa_modargs_free(ma);
 310
 311     pa__done(m);
 312
 313     return -1;
 314 }
 315
 316 int pa__get_n_used(pa_module *m) {
 317     struct userdata *u;
 318
 319     pa_assert(m);
 320     pa_assert_se(u = m->userdata);
 321
 322     return pa_source_linked_by(u->source);
 323 }
 324
 325 void pa__done(pa_module*m) {
 326     struct userdata *u;
 327
 328     pa_assert(m);
 329
 330     if (!(u = m->userdata))
 331         return;
 332
 333     if (u->source)
 334         pa_source_unlink(u->source);
 335
 336     if (u->thread) {
 337         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 338         pa_thread_free(u->thread);
 339     }
 340
 341     pa_thread_mq_done(&u->thread_mq);
 342
 343     if (u->source)
 344         pa_source_unref(u->source);
 345
 346     if (u->memchunk.memblock)
 347         pa_memblock_unref(u->memchunk.memblock);
 348
 349     if (u->rtpoll_item)
 350         pa_rtpoll_item_free(u->rtpoll_item);
 351
 352     if (u->rtpoll)
 353         pa_rtpoll_free(u->rtpoll);
 354
 355     if (u->filename) {
 356         unlink(u->filename);
 357         pa_xfree(u->filename);
 358     }
 359
 360     if (u->fd >= 0)
 361         pa_assert_se(pa_close(u->fd) == 0);
 362
 363     pa_xfree(u);
 364 }