code.delx.au - pulseaudio/blob - src/modules/module-pipe-sink.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 <poll.h>
  36
  37 #include <pulse/xmalloc.h>
  38
  39 #include <pulsecore/core-error.h>
  40 #include <pulsecore/sink.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-sink-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering");
  52 PA_MODULE_DESCRIPTION("UNIX pipe sink");
  53 PA_MODULE_VERSION(PACKAGE_VERSION);
  54 PA_MODULE_LOAD_ONCE(FALSE);
  55 PA_MODULE_USAGE(
  56         "sink_name=<name for the sink> "
  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 "fifo_output"
  64 #define DEFAULT_SINK_NAME "fifo_output"
  65
  66 struct userdata {
  67     pa_core *core;
  68     pa_module *module;
  69     pa_sink *sink;
  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     int write_type;
  83 };
  84
  85 static const char* const valid_modargs[] = {
  86     "file",
  87     "rate",
  88     "format",
  89     "channels",
  90     "sink_name",
  91     "channel_map",
  92     NULL
  93 };
  94
  95 static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offset, pa_memchunk *chunk) {
  96     struct userdata *u = PA_SINK(o)->userdata;
  97
  98     switch (code) {
  99
 100         case PA_SINK_MESSAGE_GET_LATENCY: {
 101             size_t n = 0;
 102             int l;
 103
 104 #ifdef FIONREAD
 105             if (ioctl(u->fd, FIONREAD, &l) >= 0 && l > 0)
 106                 n = (size_t) l;
 107 #endif
 108
 109             n += u->memchunk.length;
 110
 111             *((pa_usec_t*) data) = pa_bytes_to_usec(n, &u->sink->sample_spec);
 112             return 0;
 113         }
 114     }
 115
 116     return pa_sink_process_msg(o, code, data, offset, chunk);
 117 }
 118
 119 static int process_render(struct userdata *u) {
 120     pa_assert(u);
 121
 122     if (u->memchunk.length <= 0)
 123         pa_sink_render(u->sink, PIPE_BUF, &u->memchunk);
 124
 125     pa_assert(u->memchunk.length > 0);
 126
 127     for (;;) {
 128         ssize_t l;
 129         void *p;
 130
 131         p = pa_memblock_acquire(u->memchunk.memblock);
 132         l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &u->write_type);
 133         pa_memblock_release(u->memchunk.memblock);
 134
 135         pa_assert(l != 0);
 136
 137         if (l < 0) {
 138
 139             if (errno == EINTR)
 140                 continue;
 141             else if (errno != EAGAIN) {
 142                 pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 143                 return -1;
 144             }
 145
 146         } else {
 147
 148             u->memchunk.index += (size_t) l;
 149             u->memchunk.length -= (size_t) l;
 150
 151             if (u->memchunk.length <= 0) {
 152                 pa_memblock_unref(u->memchunk.memblock);
 153                 pa_memchunk_reset(&u->memchunk);
 154             }
 155         }
 156
 157         return 0;
 158     }
 159 }
 160
 161 static void thread_func(void *userdata) {
 162     struct userdata *u = userdata;
 163
 164     pa_assert(u);
 165
 166     pa_log_debug("Thread starting up");
 167
 168     pa_thread_mq_install(&u->thread_mq);
 169     pa_rtpoll_install(u->rtpoll);
 170
 171     for (;;) {
 172         struct pollfd *pollfd;
 173         int ret;
 174
 175         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 176
 177         /* Render some data and write it to the fifo */
 178         if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
 179
 180             if (u->sink->thread_info.rewind_requested)
 181                 pa_sink_process_rewind(u->sink, 0);
 182
 183             if (pollfd->revents) {
 184                 if (process_render(u) < 0)
 185                     goto fail;
 186
 187                 pollfd->revents = 0;
 188             }
 189         }
 190
 191         /* Hmm, nothing to do. Let's sleep */
 192         pollfd->events = (short) (u->sink->thread_info.state == PA_SINK_RUNNING ? POLLOUT : 0);
 193
 194         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 195             goto fail;
 196
 197         if (ret == 0)
 198             goto finish;
 199
 200         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 201
 202         if (pollfd->revents & ~POLLOUT) {
 203             pa_log("FIFO shutdown.");
 204             goto fail;
 205         }
 206     }
 207
 208 fail:
 209     /* If this was no regular exit from the loop we have to continue
 210      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 211     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 212     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 213
 214 finish:
 215     pa_log_debug("Thread shutting down");
 216 }
 217
 218 int pa__init(pa_module*m) {
 219     struct userdata *u;
 220     struct stat st;
 221     pa_sample_spec ss;
 222     pa_channel_map map;
 223     pa_modargs *ma;
 224     struct pollfd *pollfd;
 225     pa_sink_new_data data;
 226
 227     pa_assert(m);
 228
 229     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 230         pa_log("Failed to parse module arguments.");
 231         goto fail;
 232     }
 233
 234     ss = m->core->default_sample_spec;
 235     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 236         pa_log("Invalid sample format specification or channel map");
 237         goto fail;
 238     }
 239
 240     u = pa_xnew0(struct userdata, 1);
 241     u->core = m->core;
 242     u->module = m;
 243     m->userdata = u;
 244     pa_memchunk_reset(&u->memchunk);
 245     u->rtpoll = pa_rtpoll_new();
 246     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 247     u->write_type = 0;
 248
 249     u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 250
 251     mkfifo(u->filename, 0666);
 252     if ((u->fd = open(u->filename, O_RDWR|O_NOCTTY)) < 0) {
 253         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 254         goto fail;
 255     }
 256
 257     pa_make_fd_cloexec(u->fd);
 258     pa_make_fd_nonblock(u->fd);
 259
 260     if (fstat(u->fd, &st) < 0) {
 261         pa_log("fstat('%s'): %s", u->filename, pa_cstrerror(errno));
 262         goto fail;
 263     }
 264
 265     if (!S_ISFIFO(st.st_mode)) {
 266         pa_log("'%s' is not a FIFO.", u->filename);
 267         goto fail;
 268     }
 269
 270     pa_sink_new_data_init(&data);
 271     data.driver = __FILE__;
 272     data.module = m;
 273     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 274     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename);
 275     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO sink %s", u->filename);
 276     pa_sink_new_data_set_sample_spec(&data, &ss);
 277     pa_sink_new_data_set_channel_map(&data, &map);
 278
 279     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY);
 280     pa_sink_new_data_done(&data);
 281
 282     if (!u->sink) {
 283         pa_log("Failed to create sink.");
 284         goto fail;
 285     }
 286
 287     u->sink->parent.process_msg = sink_process_msg;
 288     u->sink->userdata = u;
 289
 290     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 291     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 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(thread_func, u))) {
 299         pa_log("Failed to create thread.");
 300         goto fail;
 301     }
 302
 303     pa_sink_put(u->sink);
 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 void pa__done(pa_module*m) {
 319     struct userdata *u;
 320
 321     pa_assert(m);
 322
 323     if (!(u = m->userdata))
 324         return;
 325
 326     if (u->sink)
 327         pa_sink_unlink(u->sink);
 328
 329     if (u->thread) {
 330         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 331         pa_thread_free(u->thread);
 332     }
 333
 334     pa_thread_mq_done(&u->thread_mq);
 335
 336     if (u->sink)
 337         pa_sink_unref(u->sink);
 338
 339     if (u->memchunk.memblock)
 340        pa_memblock_unref(u->memchunk.memblock);
 341
 342     if (u->rtpoll_item)
 343         pa_rtpoll_item_free(u->rtpoll_item);
 344
 345     if (u->rtpoll)
 346         pa_rtpoll_free(u->rtpoll);
 347
 348     if (u->filename) {
 349         unlink(u->filename);
 350         pa_xfree(u->filename);
 351     }
 352
 353     if (u->fd >= 0)
 354         pa_assert_se(pa_close(u->fd) == 0);
 355
 356     pa_xfree(u);
 357 }