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