code.delx.au - pulseaudio/blob - src/modules/module-pipe-sink.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/ioctl.h>
  37 #include <poll.h>
  38
  39 #include <pulse/xmalloc.h>
  40
  41 #include <pulsecore/core-error.h>
  42 #include <pulsecore/sink.h>
  43 #include <pulsecore/module.h>
  44 #include <pulsecore/core-util.h>
  45 #include <pulsecore/modargs.h>
  46 #include <pulsecore/log.h>
  47 #include <pulsecore/thread.h>
  48 #include <pulsecore/thread-mq.h>
  49 #include <pulsecore/rtpoll.h>
  50
  51 #include "module-pipe-sink-symdef.h"
  52
  53 PA_MODULE_AUTHOR("Lennart Poettering");
  54 PA_MODULE_DESCRIPTION("UNIX pipe sink");
  55 PA_MODULE_VERSION(PACKAGE_VERSION);
  56 PA_MODULE_LOAD_ONCE(FALSE);
  57 PA_MODULE_USAGE(
  58         "sink_name=<name for the sink> "
  59         "file=<path of the FIFO> "
  60         "format=<sample format> "
  61         "channels=<number of channels> "
  62         "rate=<sample rate>"
  63         "channel_map=<channel map>");
  64
  65 #define DEFAULT_FILE_NAME "fifo_output"
  66 #define DEFAULT_SINK_NAME "fifo_output"
  67
  68 struct userdata {
  69     pa_core *core;
  70     pa_module *module;
  71     pa_sink *sink;
  72
  73     pa_thread *thread;
  74     pa_thread_mq thread_mq;
  75     pa_rtpoll *rtpoll;
  76
  77     char *filename;
  78     int fd;
  79
  80     pa_memchunk memchunk;
  81
  82     pa_rtpoll_item *rtpoll_item;
  83
  84     int write_type;
  85 };
  86
  87 static const char* const valid_modargs[] = {
  88     "file",
  89     "rate",
  90     "format",
  91     "channels",
  92     "sink_name",
  93     "channel_map",
  94     NULL
  95 };
  96
  97 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
  98     struct userdata *u = PA_SINK(o)->userdata;
  99
 100     switch (code) {
 101
 102         case PA_SINK_MESSAGE_GET_LATENCY: {
 103             size_t n = 0;
 104             int l;
 105
 106 #ifdef TIOCINQ
 107             if (ioctl(u->fd, TIOCINQ, &l) >= 0 && l > 0)
 108                 n = (size_t) l;
 109 #endif
 110
 111             n += u->memchunk.length;
 112
 113             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->sink->sample_spec);
 114             return 0;
 115         }
 116     }
 117
 118     return pa_sink_process_msg(o, code, data, offset, chunk);
 119 }
 120
 121 static void process_rewind(struct userdata *u) {
 122     pa_assert(u);
 123
 124     pa_log_debug("Rewind requested but not supported by pipe sink. Ignoring.");
 125     u->sink->thread_info.rewind_nbytes = 0;
 126 }
 127
 128 static int process_render(struct userdata *u) {
 129     pa_assert(u);
 130
 131     if (u->memchunk.length <= 0)
 132         pa_sink_render(u->sink, PIPE_BUF, &u->memchunk);
 133
 134     pa_assert(u->memchunk.length > 0);
 135
 136     for (;;) {
 137         ssize_t l;
 138         void *p;
 139
 140         p = pa_memblock_acquire(u->memchunk.memblock);
 141         l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &u->write_type);
 142         pa_memblock_release(u->memchunk.memblock);
 143
 144         pa_assert(l != 0);
 145
 146         if (l < 0) {
 147
 148             if (errno == EINTR)
 149                 continue;
 150             else if (errno != EAGAIN) {
 151                 pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 152                 return -1;
 153             }
 154
 155         } else {
 156
 157             u->memchunk.index += l;
 158             u->memchunk.length -= l;
 159
 160             if (u->memchunk.length <= 0) {
 161                 pa_memblock_unref(u->memchunk.memblock);
 162                 pa_memchunk_reset(&u->memchunk);
 163             }
 164         }
 165
 166         return 0;
 167     }
 168 }
 169
 170 static void thread_func(void *userdata) {
 171     struct userdata *u = userdata;
 172
 173     pa_assert(u);
 174
 175     pa_log_debug("Thread starting up");
 176
 177     pa_thread_mq_install(&u->thread_mq);
 178     pa_rtpoll_install(u->rtpoll);
 179
 180     for (;;) {
 181         struct pollfd *pollfd;
 182         int ret;
 183
 184         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 185
 186         /* Render some data and write it to the fifo */
 187         if (u->sink->thread_info.state == PA_SINK_RUNNING) {
 188
 189             if (u->sink->thread_info.rewind_nbytes > 0)
 190                 process_rewind(u);
 191
 192             if (pollfd->revents) {
 193                 if (process_render(u) < 0)
 194                     goto fail;
 195
 196                 pollfd->revents = 0;
 197             }
 198         }
 199
 200         /* Hmm, nothing to do. Let's sleep */
 201         pollfd->events = u->sink->thread_info.state == PA_SINK_RUNNING ? POLLOUT : 0;
 202
 203         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 204             goto fail;
 205
 206         if (ret == 0)
 207             goto finish;
 208
 209         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 210
 211         if (pollfd->revents & ~POLLOUT) {
 212             pa_log("FIFO shutdown.");
 213             goto fail;
 214         }
 215     }
 216
 217 fail:
 218     /* If this was no regular exit from the loop we have to continue
 219      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 220     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 221     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 222
 223 finish:
 224     pa_log_debug("Thread shutting down");
 225 }
 226
 227 int pa__init(pa_module*m) {
 228     struct userdata *u;
 229     struct stat st;
 230     pa_sample_spec ss;
 231     pa_channel_map map;
 232     pa_modargs *ma;
 233     char *t;
 234     struct pollfd *pollfd;
 235     pa_sink_new_data data;
 236
 237     pa_assert(m);
 238
 239     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 240         pa_log("Failed to parse module arguments.");
 241         goto fail;
 242     }
 243
 244     ss = m->core->default_sample_spec;
 245     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 246         pa_log("Invalid sample format specification or channel map");
 247         goto fail;
 248     }
 249
 250     u = pa_xnew0(struct userdata, 1);
 251     u->core = m->core;
 252     u->module = m;
 253     m->userdata = u;
 254     pa_memchunk_reset(&u->memchunk);
 255     u->rtpoll = pa_rtpoll_new();
 256     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 257     u->write_type = 0;
 258
 259     u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 260
 261     mkfifo(u->filename, 0666);
 262     if ((u->fd = open(u->filename, O_RDWR|O_NOCTTY)) < 0) {
 263         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 264         goto fail;
 265     }
 266
 267     pa_make_fd_cloexec(u->fd);
 268     pa_make_fd_nonblock(u->fd);
 269
 270     if (fstat(u->fd, &st) < 0) {
 271         pa_log("fstat('%s'): %s", u->filename, pa_cstrerror(errno));
 272         goto fail;
 273     }
 274
 275     if (!S_ISFIFO(st.st_mode)) {
 276         pa_log("'%s' is not a FIFO.", u->filename);
 277         goto fail;
 278     }
 279
 280     pa_sink_new_data_init(&data);
 281     data.driver = __FILE__;
 282     data.module = m;
 283     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 284     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename);
 285     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO sink %s", u->filename);
 286     pa_sink_new_data_set_sample_spec(&data, &ss);
 287     pa_sink_new_data_set_channel_map(&data, &map);
 288
 289     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY);
 290     pa_sink_new_data_done(&data);
 291
 292     if (!u->sink) {
 293         pa_log("Failed to create sink.");
 294         goto fail;
 295     }
 296
 297     u->sink->parent.process_msg = sink_process_msg;
 298     u->sink->userdata = u;
 299
 300     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 301     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 302
 303     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 304     pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 305     pollfd->fd = u->fd;
 306     pollfd->events = pollfd->revents = 0;
 307
 308     if (!(u->thread = pa_thread_new(thread_func, u))) {
 309         pa_log("Failed to create thread.");
 310         goto fail;
 311     }
 312
 313     pa_sink_put(u->sink);
 314
 315     pa_modargs_free(ma);
 316
 317     return 0;
 318
 319 fail:
 320     if (ma)
 321         pa_modargs_free(ma);
 322
 323     pa__done(m);
 324
 325     return -1;
 326 }
 327
 328 void pa__done(pa_module*m) {
 329     struct userdata *u;
 330
 331     pa_assert(m);
 332
 333     if (!(u = m->userdata))
 334         return;
 335
 336     if (u->sink)
 337         pa_sink_unlink(u->sink);
 338
 339     if (u->thread) {
 340         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 341         pa_thread_free(u->thread);
 342     }
 343
 344     pa_thread_mq_done(&u->thread_mq);
 345
 346     if (u->sink)
 347         pa_sink_unref(u->sink);
 348
 349     if (u->memchunk.memblock)
 350        pa_memblock_unref(u->memchunk.memblock);
 351
 352     if (u->rtpoll_item)
 353         pa_rtpoll_item_free(u->rtpoll_item);
 354
 355     if (u->rtpoll)
 356         pa_rtpoll_free(u->rtpoll);
 357
 358     if (u->filename) {
 359         unlink(u->filename);
 360         pa_xfree(u->filename);
 361     }
 362
 363     if (u->fd >= 0)
 364         pa_assert_se(pa_close(u->fd) == 0);
 365
 366     pa_xfree(u);
 367 }