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