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