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                 return 0;
 143             else {
 144                 pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 145                 return -1;
 146             }
 147
 148         } else {
 149
 150             u->memchunk.index += (size_t) l;
 151             u->memchunk.length -= (size_t) l;
 152
 153             if (u->memchunk.length <= 0) {
 154                 pa_memblock_unref(u->memchunk.memblock);
 155                 pa_memchunk_reset(&u->memchunk);
 156             }
 157         }
 158
 159         return 0;
 160     }
 161 }
 162
 163 static void thread_func(void *userdata) {
 164     struct userdata *u = userdata;
 165
 166     pa_assert(u);
 167
 168     pa_log_debug("Thread starting up");
 169
 170     pa_thread_mq_install(&u->thread_mq);
 171     pa_rtpoll_install(u->rtpoll);
 172
 173     for (;;) {
 174         struct pollfd *pollfd;
 175         int ret;
 176
 177         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 178
 179         /* Render some data and write it to the fifo */
 180         if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
 181
 182             if (u->sink->thread_info.rewind_requested)
 183                 pa_sink_process_rewind(u->sink, 0);
 184
 185             if (pollfd->revents) {
 186                 if (process_render(u) < 0)
 187                     goto fail;
 188
 189                 pollfd->revents = 0;
 190             }
 191         }
 192
 193         /* Hmm, nothing to do. Let's sleep */
 194         pollfd->events = (short) (u->sink->thread_info.state == PA_SINK_RUNNING ? POLLOUT : 0);
 195
 196         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 197             goto fail;
 198
 199         if (ret == 0)
 200             goto finish;
 201
 202         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 203
 204         if (pollfd->revents & ~POLLOUT) {
 205             pa_log("FIFO shutdown.");
 206             goto fail;
 207         }
 208     }
 209
 210 fail:
 211     /* If this was no regular exit from the loop we have to continue
 212      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 213     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 214     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 215
 216 finish:
 217     pa_log_debug("Thread shutting down");
 218 }
 219
 220 int pa__init(pa_module*m) {
 221     struct userdata *u;
 222     struct stat st;
 223     pa_sample_spec ss;
 224     pa_channel_map map;
 225     pa_modargs *ma;
 226     struct pollfd *pollfd;
 227     pa_sink_new_data data;
 228
 229     pa_assert(m);
 230
 231     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 232         pa_log("Failed to parse module arguments.");
 233         goto fail;
 234     }
 235
 236     ss = m->core->default_sample_spec;
 237     map = m->core->default_channel_map;
 238     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 239         pa_log("Invalid sample format specification or channel map");
 240         goto fail;
 241     }
 242
 243     u = pa_xnew0(struct userdata, 1);
 244     u->core = m->core;
 245     u->module = m;
 246     m->userdata = u;
 247     pa_memchunk_reset(&u->memchunk);
 248     u->rtpoll = pa_rtpoll_new();
 249     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 250     u->write_type = 0;
 251
 252     u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 253
 254     mkfifo(u->filename, 0666);
 255     if ((u->fd = open(u->filename, O_RDWR|O_NOCTTY)) < 0) {
 256         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 257         goto fail;
 258     }
 259
 260     pa_make_fd_cloexec(u->fd);
 261     pa_make_fd_nonblock(u->fd);
 262
 263     if (fstat(u->fd, &st) < 0) {
 264         pa_log("fstat('%s'): %s", u->filename, pa_cstrerror(errno));
 265         goto fail;
 266     }
 267
 268     if (!S_ISFIFO(st.st_mode)) {
 269         pa_log("'%s' is not a FIFO.", u->filename);
 270         goto fail;
 271     }
 272
 273     pa_sink_new_data_init(&data);
 274     data.driver = __FILE__;
 275     data.module = m;
 276     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 277     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename);
 278     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO sink %s", u->filename);
 279     pa_sink_new_data_set_sample_spec(&data, &ss);
 280     pa_sink_new_data_set_channel_map(&data, &map);
 281
 282     u->sink = pa_sink_new(m->core, &data, PA_SINK_LATENCY);
 283     pa_sink_new_data_done(&data);
 284
 285     if (!u->sink) {
 286         pa_log("Failed to create sink.");
 287         goto fail;
 288     }
 289
 290     u->sink->parent.process_msg = sink_process_msg;
 291     u->sink->userdata = u;
 292
 293     pa_sink_set_asyncmsgq(u->sink, u->thread_mq.inq);
 294     pa_sink_set_rtpoll(u->sink, u->rtpoll);
 295
 296     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 297     pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 298     pollfd->fd = u->fd;
 299     pollfd->events = pollfd->revents = 0;
 300
 301     if (!(u->thread = pa_thread_new(thread_func, u))) {
 302         pa_log("Failed to create thread.");
 303         goto fail;
 304     }
 305
 306     pa_sink_put(u->sink);
 307
 308     pa_modargs_free(ma);
 309
 310     return 0;
 311
 312 fail:
 313     if (ma)
 314         pa_modargs_free(ma);
 315
 316     pa__done(m);
 317
 318     return -1;
 319 }
 320
 321 int pa__get_n_used(pa_module *m) {
 322     struct userdata *u;
 323
 324     pa_assert(m);
 325     pa_assert_se(u = m->userdata);
 326
 327     return pa_sink_linked_by(u->sink);
 328 }
 329
 330 void pa__done(pa_module*m) {
 331     struct userdata *u;
 332
 333     pa_assert(m);
 334
 335     if (!(u = m->userdata))
 336         return;
 337
 338     if (u->sink)
 339         pa_sink_unlink(u->sink);
 340
 341     if (u->thread) {
 342         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 343         pa_thread_free(u->thread);
 344     }
 345
 346     pa_thread_mq_done(&u->thread_mq);
 347
 348     if (u->sink)
 349         pa_sink_unref(u->sink);
 350
 351     if (u->memchunk.memblock)
 352        pa_memblock_unref(u->memchunk.memblock);
 353
 354     if (u->rtpoll_item)
 355         pa_rtpoll_item_free(u->rtpoll_item);
 356
 357     if (u->rtpoll)
 358         pa_rtpoll_free(u->rtpoll);
 359
 360     if (u->filename) {
 361         unlink(u->filename);
 362         pa_xfree(u->filename);
 363     }
 364
 365     if (u->fd >= 0)
 366         pa_assert_se(pa_close(u->fd) == 0);
 367
 368     pa_xfree(u);
 369 }