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