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 <polyp/xmalloc.h>
  37
  38 #include <polypcore/iochannel.h>
  39 #include <polypcore/sink.h>
  40 #include <polypcore/module.h>
  41 #include <polypcore/util.h>
  42 #include <polypcore/modargs.h>
  43 #include <polypcore/log.h>
  44
  45 #include "module-pipe-sink-symdef.h"
  46
  47 PA_MODULE_AUTHOR("Lennart Poettering")
  48 PA_MODULE_DESCRIPTION("UNIX pipe sink")
  49 PA_MODULE_VERSION(PACKAGE_VERSION)
  50 PA_MODULE_USAGE(
  51         "sink_name=<name for the sink> "
  52         "file=<path of the FIFO> "
  53         "format=<sample format> "
  54         "channels=<number of channels> "
  55         "rate=<sample rate>"
  56         "channel_map=<channel map>")
  57
  58 #define DEFAULT_FIFO_NAME "/tmp/music.output"
  59 #define DEFAULT_SINK_NAME "fifo_output"
  60
  61 struct userdata {
  62     pa_core *core;
  63
  64     char *filename;
  65
  66     pa_sink *sink;
  67     pa_iochannel *io;
  68     pa_defer_event *defer_event;
  69
  70     pa_memchunk memchunk;
  71     pa_module *module;
  72 };
  73
  74 static const char* const valid_modargs[] = {
  75     "file",
  76     "rate",
  77     "format",
  78     "channels",
  79     "sink_name",
  80     "channel_map",
  81     NULL
  82 };
  83
  84 static void do_write(struct userdata *u) {
  85     ssize_t r;
  86     assert(u);
  87
  88     u->core->mainloop->defer_enable(u->defer_event, 0);
  89
  90     if (!pa_iochannel_is_writable(u->io))
  91         return;
  92
  93     pa_module_set_used(u->module, pa_idxset_size(u->sink->inputs) + pa_idxset_size(u->sink->monitor_source->outputs));
  94
  95     if (!u->memchunk.length)
  96         if (pa_sink_render(u->sink, PIPE_BUF, &u->memchunk) < 0)
  97             return;
  98
  99     assert(u->memchunk.memblock && u->memchunk.length);
 100
 101     if ((r = pa_iochannel_write(u->io, (uint8_t*) u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length)) < 0) {
 102         pa_log(__FILE__": write() failed: %s", strerror(errno));
 103         return;
 104     }
 105
 106     u->memchunk.index += r;
 107     u->memchunk.length -= r;
 108
 109     if (u->memchunk.length <= 0) {
 110         pa_memblock_unref(u->memchunk.memblock);
 111         u->memchunk.memblock = NULL;
 112     }
 113 }
 114
 115 static void notify_cb(pa_sink*s) {
 116     struct userdata *u = s->userdata;
 117     assert(s && u);
 118
 119     if (pa_iochannel_is_writable(u->io))
 120         u->core->mainloop->defer_enable(u->defer_event, 1);
 121 }
 122
 123 static pa_usec_t get_latency_cb(pa_sink *s) {
 124     struct userdata *u = s->userdata;
 125     assert(s && u);
 126
 127     return u->memchunk.memblock ? pa_bytes_to_usec(u->memchunk.length, &s->sample_spec) : 0;
 128 }
 129
 130 static void defer_callback(PA_GCC_UNUSED pa_mainloop_api *m, PA_GCC_UNUSED pa_defer_event*e, void *userdata) {
 131     struct userdata *u = userdata;
 132     assert(u);
 133     do_write(u);
 134 }
 135
 136 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 137     struct userdata *u = userdata;
 138     assert(u);
 139     do_write(u);
 140 }
 141
 142 int pa__init(pa_core *c, pa_module*m) {
 143     struct userdata *u = NULL;
 144     struct stat st;
 145     const char *p;
 146     int fd = -1;
 147     pa_sample_spec ss;
 148     pa_channel_map map;
 149     pa_modargs *ma = NULL;
 150     assert(c && m);
 151
 152     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 153         pa_log(__FILE__": failed to parse module arguments");
 154         goto fail;
 155     }
 156
 157     ss = c->default_sample_spec;
 158     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 159         pa_log(__FILE__": invalid sample format specification");
 160         goto fail;
 161     }
 162
 163     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 164
 165     if ((fd = open(p, O_RDWR)) < 0) {
 166         pa_log(__FILE__": open('%s'): %s", p, strerror(errno));
 167         goto fail;
 168     }
 169
 170     pa_fd_set_cloexec(fd, 1);
 171
 172     if (fstat(fd, &st) < 0) {
 173         pa_log(__FILE__": fstat('%s'): %s", p, strerror(errno));
 174         goto fail;
 175     }
 176
 177     if (!S_ISFIFO(st.st_mode)) {
 178         pa_log(__FILE__": '%s' is not a FIFO.", p);
 179         goto fail;
 180     }
 181
 182     u = pa_xmalloc0(sizeof(struct userdata));
 183     u->filename = pa_xstrdup(p);
 184     u->core = c;
 185     u->module = m;
 186     m->userdata = u;
 187
 188     if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map))) {
 189         pa_log(__FILE__": failed to create sink.");
 190         goto fail;
 191     }
 192     u->sink->notify = notify_cb;
 193     u->sink->get_latency = get_latency_cb;
 194     u->sink->userdata = u;
 195     pa_sink_set_owner(u->sink, m);
 196     u->sink->description = pa_sprintf_malloc("Unix FIFO sink '%s'", p);
 197     assert(u->sink->description);
 198
 199     u->io = pa_iochannel_new(c->mainloop, -1, fd);
 200     assert(u->io);
 201     pa_iochannel_set_callback(u->io, io_callback, u);
 202
 203     u->memchunk.memblock = NULL;
 204     u->memchunk.length = 0;
 205
 206     u->defer_event = c->mainloop->defer_new(c->mainloop, defer_callback, u);
 207     assert(u->defer_event);
 208     c->mainloop->defer_enable(u->defer_event, 0);
 209
 210     pa_modargs_free(ma);
 211
 212     return 0;
 213
 214 fail:
 215     if (ma)
 216         pa_modargs_free(ma);
 217
 218     if (fd >= 0)
 219         close(fd);
 220
 221     pa__done(c, m);
 222
 223     return -1;
 224 }
 225
 226 void pa__done(pa_core *c, pa_module*m) {
 227     struct userdata *u;
 228     assert(c && m);
 229
 230     if (!(u = m->userdata))
 231         return;
 232
 233     if (u->memchunk.memblock)
 234         pa_memblock_unref(u->memchunk.memblock);
 235
 236     pa_sink_disconnect(u->sink);
 237     pa_sink_unref(u->sink);
 238     pa_iochannel_free(u->io);
 239     u->core->mainloop->defer_free(u->defer_event);
 240
 241     assert(u->filename);
 242     unlink(u->filename);
 243     pa_xfree(u->filename);
 244
 245     pa_xfree(u);
 246 }