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 2.1 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         "sink_properties=<properties for the sink> "
  58         "file=<path of the FIFO> "
  59         "format=<sample format> "
  60         "rate=<sample rate>"
  61         "channels=<number of channels> "
  62         "channel_map=<channel map>");
  63
  64 #define DEFAULT_FILE_NAME "fifo_output"
  65 #define DEFAULT_SINK_NAME "fifo_output"
  66
  67 struct userdata {
  68     pa_core *core;
  69     pa_module *module;
  70     pa_sink *sink;
  71
  72     pa_thread *thread;
  73     pa_thread_mq thread_mq;
  74     pa_rtpoll *rtpoll;
  75
  76     char *filename;
  77     int fd;
  78
  79     pa_memchunk memchunk;
  80
  81     pa_rtpoll_item *rtpoll_item;
  82
  83     int write_type;
  84 };
  85
  86 static const char* const valid_modargs[] = {
  87     "sink_name",
  88     "sink_properties",
  89     "file",
  90     "format",
  91     "rate",
  92     "channels",
  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 FIONREAD
 107             if (ioctl(u->fd, FIONREAD, &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 int process_render(struct userdata *u) {
 122     pa_assert(u);
 123
 124     if (u->memchunk.length <= 0)
 125         pa_sink_render(u->sink, PIPE_BUF, &u->memchunk);
 126
 127     pa_assert(u->memchunk.length > 0);
 128
 129     for (;;) {
 130         ssize_t l;
 131         void *p;
 132
 133         p = pa_memblock_acquire(u->memchunk.memblock);
 134         l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length, &u->write_type);
 135         pa_memblock_release(u->memchunk.memblock);
 136
 137         pa_assert(l != 0);
 138
 139         if (l < 0) {
 140
 141             if (errno == EINTR)
 142                 continue;
 143             else if (errno == EAGAIN)
 144                 return 0;
 145             else {
 146                 pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 147                 return -1;
 148             }
 149
 150         } else {
 151
 152             u->memchunk.index += (size_t) l;
 153             u->memchunk.length -= (size_t) l;
 154
 155             if (u->memchunk.length <= 0) {
 156                 pa_memblock_unref(u->memchunk.memblock);
 157                 pa_memchunk_reset(&u->memchunk);
 158             }
 159         }
 160
 161         return 0;
 162     }
 163 }
 164
 165 static void thread_func(void *userdata) {
 166     struct userdata *u = userdata;
 167
 168     pa_assert(u);
 169
 170     pa_log_debug("Thread starting up");
 171
 172     pa_thread_mq_install(&u->thread_mq);
 173
 174     for (;;) {
 175         struct pollfd *pollfd;
 176         int ret;
 177
 178         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 179
 180         /* Render some data and write it to the fifo */
 181         if (PA_SINK_IS_OPENED(u->sink->thread_info.state)) {
 182
 183             if (u->sink->thread_info.rewind_requested)
 184                 pa_sink_process_rewind(u->sink, 0);
 185
 186             if (pollfd->revents) {
 187                 if (process_render(u) < 0)
 188                     goto fail;
 189
 190                 pollfd->revents = 0;
 191             }
 192         }
 193
 194         /* Hmm, nothing to do. Let's sleep */
 195         pollfd->events = (short) (u->sink->thread_info.state == PA_SINK_RUNNING ? POLLOUT : 0);
 196
 197         if ((ret = pa_rtpoll_run(u->rtpoll, TRUE)) < 0)
 198             goto fail;
 199
 200         if (ret == 0)
 201             goto finish;
 202
 203         pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 204
 205         if (pollfd->revents & ~POLLOUT) {
 206             pa_log("FIFO shutdown.");
 207             goto fail;
 208         }
 209     }
 210
 211 fail:
 212     /* If this was no regular exit from the loop we have to continue
 213      * processing messages until we received PA_MESSAGE_SHUTDOWN */
 214     pa_asyncmsgq_post(u->thread_mq.outq, PA_MSGOBJECT(u->core), PA_CORE_MESSAGE_UNLOAD_MODULE, u->module, 0, NULL, NULL);
 215     pa_asyncmsgq_wait_for(u->thread_mq.inq, PA_MESSAGE_SHUTDOWN);
 216
 217 finish:
 218     pa_log_debug("Thread shutting down");
 219 }
 220
 221 int pa__init(pa_module*m) {
 222     struct userdata *u;
 223     struct stat st;
 224     pa_sample_spec ss;
 225     pa_channel_map map;
 226     pa_modargs *ma;
 227     struct pollfd *pollfd;
 228     pa_sink_new_data data;
 229
 230     pa_assert(m);
 231
 232     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 233         pa_log("Failed to parse module arguments.");
 234         goto fail;
 235     }
 236
 237     ss = m->core->default_sample_spec;
 238     map = m->core->default_channel_map;
 239     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 240         pa_log("Invalid sample format specification or channel map");
 241         goto fail;
 242     }
 243
 244     u = pa_xnew0(struct userdata, 1);
 245     u->core = m->core;
 246     u->module = m;
 247     m->userdata = u;
 248     pa_memchunk_reset(&u->memchunk);
 249     u->rtpoll = pa_rtpoll_new();
 250     pa_thread_mq_init(&u->thread_mq, m->core->mainloop, u->rtpoll);
 251     u->write_type = 0;
 252
 253     u->filename = pa_runtime_path(pa_modargs_get_value(ma, "file", DEFAULT_FILE_NAME));
 254
 255     mkfifo(u->filename, 0666);
 256     if ((u->fd = open(u->filename, O_RDWR|O_NOCTTY)) < 0) {
 257         pa_log("open('%s'): %s", u->filename, pa_cstrerror(errno));
 258         goto fail;
 259     }
 260
 261     pa_make_fd_cloexec(u->fd);
 262     pa_make_fd_nonblock(u->fd);
 263
 264     if (fstat(u->fd, &st) < 0) {
 265         pa_log("fstat('%s'): %s", u->filename, pa_cstrerror(errno));
 266         goto fail;
 267     }
 268
 269     if (!S_ISFIFO(st.st_mode)) {
 270         pa_log("'%s' is not a FIFO.", u->filename);
 271         goto fail;
 272     }
 273
 274     pa_sink_new_data_init(&data);
 275     data.driver = __FILE__;
 276     data.module = m;
 277     pa_sink_new_data_set_name(&data, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME));
 278     pa_proplist_sets(data.proplist, PA_PROP_DEVICE_STRING, u->filename);
 279     pa_proplist_setf(data.proplist, PA_PROP_DEVICE_DESCRIPTION, "Unix FIFO sink %s", u->filename);
 280     pa_sink_new_data_set_sample_spec(&data, &ss);
 281     pa_sink_new_data_set_channel_map(&data, &map);
 282
 283     if (pa_modargs_get_proplist(ma, "sink_properties", data.proplist, PA_UPDATE_REPLACE) < 0) {
 284         pa_log("Invalid properties");
 285         pa_sink_new_data_done(&data);
 286         goto fail;
 287     }
 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     pa_sink_set_max_request(u->sink, PIPE_BUF);
 303     pa_sink_set_fixed_latency(u->sink, pa_bytes_to_usec(PIPE_BUF, &u->sink->sample_spec));
 304
 305     u->rtpoll_item = pa_rtpoll_item_new(u->rtpoll, PA_RTPOLL_NEVER, 1);
 306     pollfd = pa_rtpoll_item_get_pollfd(u->rtpoll_item, NULL);
 307     pollfd->fd = u->fd;
 308     pollfd->events = pollfd->revents = 0;
 309
 310     if (!(u->thread = pa_thread_new(thread_func, u))) {
 311         pa_log("Failed to create thread.");
 312         goto fail;
 313     }
 314
 315     pa_sink_put(u->sink);
 316
 317     pa_modargs_free(ma);
 318
 319     return 0;
 320
 321 fail:
 322     if (ma)
 323         pa_modargs_free(ma);
 324
 325     pa__done(m);
 326
 327     return -1;
 328 }
 329
 330 int pa__get_n_used(pa_module *m) {
 331     struct userdata *u;
 332
 333     pa_assert(m);
 334     pa_assert_se(u = m->userdata);
 335
 336     return pa_sink_linked_by(u->sink);
 337 }
 338
 339 void pa__done(pa_module*m) {
 340     struct userdata *u;
 341
 342     pa_assert(m);
 343
 344     if (!(u = m->userdata))
 345         return;
 346
 347     if (u->sink)
 348         pa_sink_unlink(u->sink);
 349
 350     if (u->thread) {
 351         pa_asyncmsgq_send(u->thread_mq.inq, NULL, PA_MESSAGE_SHUTDOWN, NULL, 0, NULL);
 352         pa_thread_free(u->thread);
 353     }
 354
 355     pa_thread_mq_done(&u->thread_mq);
 356
 357     if (u->sink)
 358         pa_sink_unref(u->sink);
 359
 360     if (u->memchunk.memblock)
 361        pa_memblock_unref(u->memchunk.memblock);
 362
 363     if (u->rtpoll_item)
 364         pa_rtpoll_item_free(u->rtpoll_item);
 365
 366     if (u->rtpoll)
 367         pa_rtpoll_free(u->rtpoll);
 368
 369     if (u->filename) {
 370         unlink(u->filename);
 371         pa_xfree(u->filename);
 372     }
 373
 374     if (u->fd >= 0)
 375         pa_assert_se(pa_close(u->fd) == 0);
 376
 377     pa_xfree(u);
 378 }