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