code.delx.au - pulseaudio/blob - src/modules/module-pipe-sink.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio 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   polypaudio 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 polypaudio; 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 <assert.h>
  30 #include <errno.h>
  31 #include <string.h>
  32 #include <fcntl.h>
  33 #include <unistd.h>
  34 #include <limits.h>
  35
  36 #include <polypcore/iochannel.h>
  37 #include <polypcore/sink.h>
  38 #include <polypcore/module.h>
  39 #include <polypcore/util.h>
  40 #include <polypcore/modargs.h>
  41 #include <polypcore/xmalloc.h>
  42 #include <polypcore/log.h>
  43
  44 #include "module-pipe-sink-symdef.h"
  45
  46 PA_MODULE_AUTHOR("Lennart Poettering")
  47 PA_MODULE_DESCRIPTION("UNIX pipe sink")
  48 PA_MODULE_VERSION(PACKAGE_VERSION)
  49 PA_MODULE_USAGE(
  50         "sink_name=<name for the sink> "
  51         "file=<path of the FIFO> "
  52         "format=<sample format> "
  53         "channels=<number of channels> "
  54         "rate=<sample rate>"
  55         "channel_map=<channel map>")
  56
  57 #define DEFAULT_FIFO_NAME "/tmp/music.output"
  58 #define DEFAULT_SINK_NAME "fifo_output"
  59
  60 struct userdata {
  61     pa_core *core;
  62
  63     char *filename;
  64
  65     pa_sink *sink;
  66     pa_iochannel *io;
  67     pa_defer_event *defer_event;
  68
  69     pa_memchunk memchunk;
  70     pa_module *module;
  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 static void do_write(struct userdata *u) {
  84     ssize_t r;
  85     assert(u);
  86
  87     u->core->mainloop->defer_enable(u->defer_event, 0);
  88
  89     if (!pa_iochannel_is_writable(u->io))
  90         return;
  91
  92     pa_module_set_used(u->module, pa_idxset_size(u->sink->inputs) + pa_idxset_size(u->sink->monitor_source->outputs));
  93
  94     if (!u->memchunk.length)
  95         if (pa_sink_render(u->sink, PIPE_BUF, &u->memchunk) < 0)
  96             return;
  97
  98     assert(u->memchunk.memblock && u->memchunk.length);
  99
 100     if ((r = pa_iochannel_write(u->io, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length)) < 0) {
 101         pa_log(__FILE__": write() failed: %s", strerror(errno));
 102         return;
 103     }
 104
 105     u->memchunk.index += r;
 106     u->memchunk.length -= r;
 107
 108     if (u->memchunk.length <= 0) {
 109         pa_memblock_unref(u->memchunk.memblock);
 110         u->memchunk.memblock = NULL;
 111     }
 112 }
 113
 114 static void notify_cb(pa_sink*s) {
 115     struct userdata *u = s->userdata;
 116     assert(s && u);
 117
 118     if (pa_iochannel_is_writable(u->io))
 119         u->core->mainloop->defer_enable(u->defer_event, 1);
 120 }
 121
 122 static pa_usec_t get_latency_cb(pa_sink *s) {
 123     struct userdata *u = s->userdata;
 124     assert(s && u);
 125
 126     return u->memchunk.memblock ? pa_bytes_to_usec(u->memchunk.length, &s->sample_spec) : 0;
 127 }
 128
 129 static void defer_callback(PA_GCC_UNUSED pa_mainloop_api *m, PA_GCC_UNUSED pa_defer_event*e, void *userdata) {
 130     struct userdata *u = userdata;
 131     assert(u);
 132     do_write(u);
 133 }
 134
 135 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 136     struct userdata *u = userdata;
 137     assert(u);
 138     do_write(u);
 139 }
 140
 141 int pa__init(pa_core *c, pa_module*m) {
 142     struct userdata *u = NULL;
 143     struct stat st;
 144     const char *p;
 145     int fd = -1;
 146     pa_sample_spec ss;
 147     pa_channel_map map;
 148     pa_modargs *ma = NULL;
 149     assert(c && m);
 150
 151     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 152         pa_log(__FILE__": failed to parse module arguments");
 153         goto fail;
 154     }
 155
 156     ss = c->default_sample_spec;
 157     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map) < 0) {
 158         pa_log(__FILE__": invalid sample format specification");
 159         goto fail;
 160     }
 161
 162     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 163
 164     if ((fd = open(p, O_RDWR)) < 0) {
 165         pa_log(__FILE__": open('%s'): %s", p, strerror(errno));
 166         goto fail;
 167     }
 168
 169     pa_fd_set_cloexec(fd, 1);
 170
 171     if (fstat(fd, &st) < 0) {
 172         pa_log(__FILE__": fstat('%s'): %s", p, strerror(errno));
 173         goto fail;
 174     }
 175
 176     if (!S_ISFIFO(st.st_mode)) {
 177         pa_log(__FILE__": '%s' is not a FIFO.", p);
 178         goto fail;
 179     }
 180
 181     u = pa_xmalloc0(sizeof(struct userdata));
 182     u->filename = pa_xstrdup(p);
 183     u->core = c;
 184     u->module = m;
 185     m->userdata = u;
 186
 187     if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map))) {
 188         pa_log(__FILE__": failed to create sink.");
 189         goto fail;
 190     }
 191     u->sink->notify = notify_cb;
 192     u->sink->get_latency = get_latency_cb;
 193     u->sink->userdata = u;
 194     pa_sink_set_owner(u->sink, m);
 195     u->sink->description = pa_sprintf_malloc("Unix FIFO sink '%s'", p);
 196     assert(u->sink->description);
 197
 198     u->io = pa_iochannel_new(c->mainloop, -1, fd);
 199     assert(u->io);
 200     pa_iochannel_set_callback(u->io, io_callback, u);
 201
 202     u->memchunk.memblock = NULL;
 203     u->memchunk.length = 0;
 204
 205     u->defer_event = c->mainloop->defer_new(c->mainloop, defer_callback, u);
 206     assert(u->defer_event);
 207     c->mainloop->defer_enable(u->defer_event, 0);
 208
 209     pa_modargs_free(ma);
 210
 211     return 0;
 212
 213 fail:
 214     if (ma)
 215         pa_modargs_free(ma);
 216
 217     if (fd >= 0)
 218         close(fd);
 219
 220     pa__done(c, m);
 221
 222     return -1;
 223 }
 224
 225 void pa__done(pa_core *c, pa_module*m) {
 226     struct userdata *u;
 227     assert(c && m);
 228
 229     if (!(u = m->userdata))
 230         return;
 231
 232     if (u->memchunk.memblock)
 233         pa_memblock_unref(u->memchunk.memblock);
 234
 235     pa_sink_disconnect(u->sink);
 236     pa_sink_unref(u->sink);
 237     pa_iochannel_free(u->io);
 238     u->core->mainloop->defer_free(u->defer_event);
 239
 240     assert(u->filename);
 241     unlink(u->filename);
 242     pa_xfree(u->filename);
 243
 244     pa_xfree(u);
 245 }