code.delx.au - pulseaudio/blob - src/modules/module-pipe-source.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdlib.h>
  29 #include <sys/stat.h>
  30 #include <stdio.h>
  31 #include <errno.h>
  32 #include <string.h>
  33 #include <fcntl.h>
  34 #include <unistd.h>
  35 #include <limits.h>
  36 #include <sys/poll.h>
  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
  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_USAGE(
  55         "source_name=<name for the source> "
  56         "file=<path of the FIFO> "
  57         "format=<sample format> "
  58         "channels=<number of channels> "
  59         "rate=<sample rate> "
  60         "channel_map=<channel map>")
  61
  62 #define DEFAULT_FILE_NAME "/tmp/music.input"
  63 #define DEFAULT_SOURCE_NAME "fifo_input"
  64
  65 struct userdata {
  66     pa_core *core;
  67     pa_module *module;
  68     pa_source *source;
  69     pa_thread *thread;
  70     pa_thread_mq thread_mq;
  71
  72     char *filename;
  73     int fd;
  74
  75     pa_memchunk memchunk;
  76 };
  77
  78 static const char* const valid_modargs[] = {
  79     "file",
  80     "rate",
  81     "channels",
  82     "format",
  83     "source_name",
  84     "channel_map",
  85     NULL
  86 };
  87
  88 static void thread_func(void *userdata) {
  89     enum {
  90         POLLFD_ASYNCQ,
  91         POLLFD_FIFO,
  92         POLLFD_MAX,
  93     };
  94
  95     struct userdata *u = userdata;
  96     struct pollfd pollfd[POLLFD_MAX];
  97     int read_type = 0;
  98
  99     pa_assert(u);
 100
 101     pa_log_debug("Thread starting up");
 102
 103     pa_thread_mq_install(&u->thread_mq);
 104
 105     memset(&pollfd, 0, sizeof(pollfd));
 106
 107     pollfd[POLLFD_ASYNCQ].fd = pa_asyncmsgq_get_fd(u->thread_mq.inq);
 108     pollfd[POLLFD_ASYNCQ].events = POLLIN;
 109     pollfd[POLLFD_FIFO].fd = u->fd;
 110
 111     for (;;) {
 112         pa_msgobject *object;
 113         int code;
 114         void *data;
 115         pa_memchunk chunk;
 116         int r;
 117         int64_t offset;
 118
 119         /* Check whether there is a message for us to process */
 120         if (pa_asyncmsgq_get(u->thread_mq.inq, &object, &code, &data, &offset, &chunk, 0) == 0) {
 121             int ret;
 122
 123             if (!object && code == PA_MESSAGE_SHUTDOWN) {
 124                 pa_asyncmsgq_done(u->thread_mq.inq, 0);
 125                 goto finish;
 126             }
 127
 128             ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk);
 129             pa_asyncmsgq_done(u->thread_mq.inq, ret);
 130             continue;
 131         }
 132
 133         /* Try to read some data and pass it on to the source driver */
 134
 135         if (u->source->thread_info.state == PA_SOURCE_RUNNING && pollfd[POLLFD_FIFO].revents) {
 136             void *p;
 137             ssize_t l;
 138
 139             if (!u->memchunk.memblock) {
 140                 u->memchunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
 141                 u->memchunk.index = u->memchunk.length = 0;
 142             }
 143
 144             pa_assert(pa_memblock_get_length(u->memchunk.memblock) > u->memchunk.index);
 145
 146             p = pa_memblock_acquire(u->memchunk.memblock);
 147             l = pa_read(u->fd, (uint8_t*) p + u->memchunk.index, pa_memblock_get_length(u->memchunk.memblock) - u->memchunk.index, &read_type);
 148             pa_memblock_release(u->memchunk.memblock);
 149
 150             pa_assert(l != 0); /* EOF cannot happen, since we opened the fifo for both reading and writing */
 151
 152             if (l < 0) {
 153
 154                 if (errno == EINTR)
 155                     continue;
 156                 else if (errno != EAGAIN) {
 157                     pa_log("Faile to read data from FIFO: %s", pa_cstrerror(errno));
 158                     goto fail;
 159                 }
 160
 161             } else {
 162
 163                 u->memchunk.length = l;
 164                 pa_source_post(u->source, &u->memchunk);
 165                 u->memchunk.index += l;
 166
 167                 if (u->memchunk.index >= pa_memblock_get_length(u->memchunk.memblock)) {
 168                     pa_memblock_unref(u->memchunk.memblock);
 169                     pa_memchunk_reset(&u->memchunk);
 170                 }
 171
 172                 pollfd[POLLFD_FIFO].revents = 0;
 173                 continue;
 174             }
 175         }
 176
 177         pollfd[POLLFD_FIFO].events = u->source->thread_info.state == PA_SOURCE_RUNNING ? POLLIN : 0;
 178
 179         /* Hmm, nothing to do. Let's sleep */
 180
 181         if (pa_asyncmsgq_before_poll(u->thread_mq.inq) < 0)
 182             continue;
 183
 184 /*         pa_log("polling for %i", pollfd[POLLFD_FIFO].events); */
 185         r = poll(pollfd, POLLFD_MAX, -1);
 186 /*         pa_log("polling got %i (r=%i) %i", r > 0 ? pollfd[POLLFD_FIFO].revents : 0, r, r > 0 ? pollfd[POLLFD_ASYNCQ].revents: 0); */
 187
 188         pa_asyncmsgq_after_poll(u->thread_mq.inq);
 189
 190         if (r < 0) {
 191             if (errno == EINTR)
 192                 continue;
 193
 194             pa_log("poll() failed: %s", pa_cstrerror(errno));
 195             goto fail;
 196         }
 197
 198         if (pollfd[POLLFD_FIFO].revents & ~POLLIN) {
 199             pa_log("FIFO shutdown.");
 200             goto fail;
 201         }
 202
 203         pa_assert((pollfd[POLLFD_ASYNCQ].revents & ~POLLIN) == 0);
 204     }
 205
 206 fail:
 207     /* We have to continue processing messages until we receive the
 208      * SHUTDOWN message */
 209     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 210     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 211
 212 finish:
 213     pa_log_debug("Thread shutting down");
 214 }
 215
 216 int pa__init(pa_module*m) {
 217     struct userdata *u;
 218     struct stat st;
 219     pa_sample_spec ss;
 220     pa_channel_map map;
 221     pa_modargs *ma;
 222     char *t;
 223
 224     pa_assert(m);
 225
 226     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 227         pa_log("failed to parse module arguments.");
 228         goto fail;
 229     }
 230
 231     ss = m->core->default_sample_spec;
 232     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 233         pa_log("invalid sample format specification or channel map");
 234         goto fail;
 235     }
 236
 237     u = pa_xnew0(struct userdata, 1);
 238     u->core = m->core;
 239     u->module = m;
 240     m->userdata = u;
 241     pa_memchunk_reset(&u->memchunk);
 242     pa_thread_mq_init(&u->thread_mq, m->core->mainloop);
 243
 244     u->filename = pa_xstrdup(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 245
 246     mkfifo(u->filename, 0666);
 247     if ((u->fd = open(u->filename, O_RDWR|O_NOCTTY)) < 0) {
 248         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 249         goto fail;
 250     }
 251
 252     pa_fd_set_cloexec(u->fd, 1);
 253     pa_make_nonblock_fd(u->fd);
 254
 255     if (fstat(u->fd, &st) < 0) {
 256         pa_log("fstat('%s'): %s",u->filename, pa_cstrerror(errno));
 257         goto fail;
 258     }
 259
 260     if (!S_ISFIFO(st.st_mode)) {
 261         pa_log("'%s' is not a FIFO.", u->filename);
 262         goto fail;
 263     }
 264
 265     if (!(u->source = pa_source_new(m->core, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map))) {
 266         pa_log("Failed to create source.");
 267         goto fail;
 268     }
 269
 270     u->source->userdata = u;
 271
 272     pa_source_set_module(u->source, m);
 273     pa_source_set_asyncmsgq(u->source, u->thread_mq.inq);
 274     pa_source_set_description(u->source, t = pa_sprintf_malloc("Unix FIFO source '%s'", u->filename));
 275     pa_xfree(t);
 276
 277     if (!(u->thread = pa_thread_new(thread_func, u))) {
 278         pa_log("Failed to create thread.");
 279         goto fail;
 280     }
 281
 282     pa_modargs_free(ma);
 283
 284     return 0;
 285
 286 fail:
 287     if (ma)
 288         pa_modargs_free(ma);
 289
 290     pa__done(m);
 291
 292     return -1;
 293 }
 294
 295 void pa__done(pa_module*m) {
 296     struct userdata *u;
 297
 298     pa_assert(m);
 299
 300     if (!(u = m->userdata))
 301         return;
 302
 303     if (u->source)
 304         pa_source_disconnect(u->source);
 305
 306     if (u->thread) {
 307         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 308         pa_thread_free(u->thread);
 309     }
 310
 311     pa_thread_mq_done(&u->thread_mq);
 312
 313     if (u->source)
 314         pa_source_unref(u->source);
 315
 316     if (u->memchunk.memblock)
 317         pa_memblock_unref(u->memchunk.memblock);
 318
 319     if (u->filename) {
 320         unlink(u->filename);
 321         pa_xfree(u->filename);
 322     }
 323
 324     if (u->fd >= 0)
 325         close(u->fd);
 326
 327     pa_xfree(u);
 328 }