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 <assert.h>
  32 #include <errno.h>
  33 #include <string.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36 #include <limits.h>
  37
  38 #include <pulse/xmalloc.h>
  39
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/iochannel.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
  48 #include "module-pipe-sink-symdef.h"
  49
  50 PA_MODULE_AUTHOR("Lennart Poettering")
  51 PA_MODULE_DESCRIPTION("UNIX pipe sink")
  52 PA_MODULE_VERSION(PACKAGE_VERSION)
  53 PA_MODULE_USAGE(
  54         "sink_name=<name for the sink> "
  55         "file=<path of the FIFO> "
  56         "format=<sample format> "
  57         "channels=<number of channels> "
  58         "rate=<sample rate>"
  59         "channel_map=<channel map>")
  60
  61 #define DEFAULT_FILE_NAME "/tmp/music.output"
  62 #define DEFAULT_SINK_NAME "fifo_output"
  63
  64 struct userdata {
  65     pa_core *core;
  66     pa_module *module;
  67     pa_sink *sink;
  68     char *filename;
  69     int fd;
  70     pa_thread *thread;
  71 };
  72
  73 static const char* const valid_modargs[] = {
  74     "file",
  75     "rate",
  76     "format",
  77     "channels",
  78     "sink_name",
  79     "channel_map",
  80     NULL
  81 };
  82
  83 enum {
  84     POLLFD_ASYNCQ,
  85     POLLFD_FIFO,
  86     POLLFD_MAX,
  87 };
  88
  89 static void thread_func(void *userdata) {
  90     struct userdata *u = userdata;
  91     int quit = 0;
  92     struct pollfd pollfd[POLLFD_MAX];
  93     int running = 1, underrun = 0;
  94     pa_memchunk memchunk;
  95
  96     pa_assert(u);
  97
  98     pa_log_debug("Thread starting up");
  99
 100     memset(&pollfd, 0, sizeof(pollfd));
 101     pollfd[POLLFD_ASYNCQ].fd = pa_asyncmsgq_get_fd(u->sink->asyncmsgq, PA_ASYNCQ_POP);
 102     pollfd[POLLFD_ASYNCQ].events = POLLIN;
 103
 104     pollfd[POLLFD_FIFO].fd = u->fd;
 105
 106     memset(&memchunk, 0, sizeof(memchunk));
 107
 108     for (;;) {
 109         int code;
 110         void *object, *data;
 111         int r;
 112         struct timeval now;
 113
 114         /* Check whether there is a message for us to process */
 115         if (pa_asyncmsgq_get(u->sink->asyncmsgq, &object, &code, &data) == 0) {
 116
 117
 118             /* Now process these messages our own way */
 119             if (!object) {
 120                 switch (code) {
 121                     case PA_SINK_MESSAGE_SHUTDOWN:
 122                         goto finish;
 123
 124                     default:
 125                         pa_sink_process_msg(u->sink->asyncmsgq, object, code, data);
 126                 }
 127
 128             } else if (object == u->sink) {
 129
 130                 case PA_SINK_MESSAGE_STOP:
 131                     pa_assert(running);
 132                     running = 0;
 133                     break;
 134
 135                 case PA_SINK_MESSAGE_START:
 136                     pa_assert(!running);
 137                     running = 1;
 138                     break;
 139
 140                 case PA_SINK_MESSAGE_GET_LATENCY: {
 141                     size_t n = 0;
 142                     int l;
 143
 144                     if (ioctl(u->fd, TIOCINQ, &l) >= 0 && l > 0)
 145                         n = (size_t) l;
 146
 147                     n += memchunk.length;
 148
 149                     *((pa_usec_t*) data) pa_bytes_to_usec(n, &u->sink->sample_spec);
 150                     break;
 151                 }
 152
 153                 /* ... */
 154
 155                 default:
 156                     pa_sink_process_msg(u->sink->asyncmsgq, object, code, data);
 157             }
 158
 159             pa_asyncmsgq_done(u->sink->asyncmsgq);
 160             continue;
 161         }
 162
 163         /* Render some data and write it to the fifo */
 164
 165         if (running && (pollfd[POLLFD_FIFO].revents || underrun)) {
 166
 167             if (chunk.length <= 0)
 168                 pa_sink_render(u->fd, PIPE_BUF, &chunk);
 169
 170             underrun = chunk.length <= 0;
 171
 172             if (!underrun) {
 173                 ssize_t l;
 174
 175                 p = pa_memblock_acquire(u->memchunk.memblock);
 176                 l = pa_write(u->fd, (uint8_t*) p + u->memchunk.index, u->memchunk.length);
 177                 pa_memblock_release(p);
 178
 179                 if (l < 0) {
 180
 181                     if (errno != EINTR && errno != EAGAIN) {
 182                         pa_log("Failed to write data to FIFO: %s", pa_cstrerror(errno));
 183                         goto fail;
 184                     }
 185
 186                 } else {
 187
 188                     u->memchunk.index += l;
 189                     u->memchunk.length -= l;
 190
 191                     if (u->memchunk.length <= 0) {
 192                         pa_memblock_unref(u->memchunk.memblock);
 193                         u->memchunk.memblock = NULL;
 194                     }
 195                 }
 196
 197                 pollfd[POLLFD_FIFO].revents = 0;
 198                 continue;
 199             }
 200         }
 201
 202         pollfd[POLLFD_FIFO].events = running && !underrun ? POLLOUT : 0;
 203
 204         /* Hmm, nothing to do. Let's sleep */
 205
 206         if (pa_asyncmsgq_before_poll(u->sink->asyncmsgq) < 0)
 207             continue;
 208
 209         r = poll(&pollfd, 1, 0);
 210         pa_asyncmsgq_after_poll(u->sink->asyncmsgq);
 211
 212         if (r < 0) {
 213             if (errno == EINTR)
 214                 continue;
 215
 216             pa_log("poll() failed: %s", pa_cstrerror(errno));
 217             goto fail;
 218         }
 219
 220         if (pollfd[POLLFD_FIFO].revents & ~POLLIN) {
 221             pa_log("FIFO shutdown.");
 222             goto fail;
 223         }
 224
 225         pa_assert(pollfd[POLLFD_ASYNCQ].revents & ~POLLIN == 0);
 226     }
 227
 228 fail:
 229     /* We have to continue processing messages until we receive the
 230      * SHUTDOWN message */
 231     pa_asyncmsgq_post(u->core->asyncmsgq, u->core, PA_CORE_MESSAGE_UNLOAD_MODULE, pa_module_ref(u->module), pa_module_unref);
 232     pa_asyncmsgq_wait_for(PA_SINK_MESSAGE_SHUTDOWN);
 233
 234 finish:
 235     pa_log_debug("Thread shutting down");
 236 }
 237
 238 int pa__init(pa_core *c, pa_module*m) {
 239     struct userdata *u = NULL;
 240     struct stat st;
 241     pa_sample_spec ss;
 242     pa_channel_map map;
 243     pa_modargs *ma = NULL;
 244     char *t;
 245
 246     pa_assert(c);
 247     pa_assert(m);
 248
 249     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 250         pa_log("Failed to parse module arguments.");
 251         goto fail;
 252     }
 253
 254     ss = c->default_sample_spec;
 255     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 256         pa_log("Invalid sample format specification");
 257         goto fail;
 258     }
 259
 260     u = pa_xnew0(struct userdata, 1);
 261     u->core = c;
 262     u->module = m;
 263     u->filename = pa_xstrdup(pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME));
 264     u->fd = fd;
 265     u->memchunk.memblock = NULL;
 266     u->memchunk.length = 0;
 267     m->userdata = u;
 268
 269     mkfifo(u->filename, 0666);
 270
 271     if ((u->fd = open(u->filename, O_RDWR)) < 0) {
 272         pa_log("open('%s'): %s", p, pa_cstrerror(errno));
 273         goto fail;
 274     }
 275
 276     pa_fd_set_cloexec(u->fd, 1);
 277     pa_make_nonblock_fd(u->fd);
 278
 279     if (fstat(u->fd, &st) < 0) {
 280         pa_log("fstat('%s'): %s", p, pa_cstrerror(errno));
 281         goto fail;
 282     }
 283
 284     if (!S_ISFIFO(st.st_mode)) {
 285         pa_log("'%s' is not a FIFO.", p);
 286         goto fail;
 287     }
 288
 289     if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map))) {
 290         pa_log("Failed to create sink.");
 291         goto fail;
 292     }
 293
 294     u->sink->userdata = u;
 295     pa_sink_set_owner(u->sink, m);
 296     pa_sink_set_description(u->sink, t = pa_sprintf_malloc("Unix FIFO sink '%s'", p));
 297     pa_xfree(t);
 298
 299     if (!(u->thread = pa_thread_new(thread_func, u))) {
 300         pa_log("Failed to create thread.");
 301         goto fail;
 302     }
 303
 304     pa_modargs_free(ma);
 305
 306     return 0;
 307
 308 fail:
 309     if (ma)
 310         pa_modargs_free(ma);
 311
 312     pa__done(c, m);
 313
 314     return -1;
 315 }
 316
 317 void pa__done(pa_core *c, pa_module*m) {
 318     struct userdata *u;
 319     pa_assert(c);
 320     pa_assert(m);
 321
 322     if (!(u = m->userdata))
 323         return;
 324
 325     pa_sink_disconnect(u->sink);
 326
 327     if (u->thread) {
 328         pa_asyncmsgq_send(u->sink->asyncmsgq, PA_SINK_MESSAGE_SHUTDOWN, NULL);
 329         pa_thread_free(u->thread);
 330     }
 331
 332     pa_sink_unref(u->sink);
 333
 334     if (u->memchunk.memblock)
 335        pa_memblock_unref(u->memchunk.memblock);
 336
 337     if (u->filename) {
 338         unlink(u->filename);
 339         pa_xfree(u->filename);
 340     }
 341
 342     if (u->fd >= 0)
 343         close(u->fd);
 344
 345     pa_xfree(u);
 346 }