code.delx.au - pulseaudio/blob - src/modules/module-pipe-source.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 <polypcore/iochannel.h>
  37 #include <polypcore/source.h>
  38 #include <polypcore/module.h>
  39 #include <polypcore/util.h>
  40 #include <polypcore/modargs.h>
  41 #include <polypcore/xmalloc.h>
  42 #include <polypcore/log.h>
  43
  44 #include "module-pipe-source-symdef.h"
  45
  46 PA_MODULE_AUTHOR("Lennart Poettering")
  47 PA_MODULE_DESCRIPTION("UNIX pipe source")
  48 PA_MODULE_VERSION(PACKAGE_VERSION)
  49 PA_MODULE_USAGE("source_name=<name for the source> file=<path of the FIFO> format=<sample format> channels=<number of channels> rate=<sample rate>")
  50
  51 #define DEFAULT_FIFO_NAME "/tmp/music.input"
  52 #define DEFAULT_SOURCE_NAME "fifo_input"
  53
  54 struct userdata {
  55     pa_core *core;
  56
  57     char *filename;
  58
  59     pa_source *source;
  60     pa_iochannel *io;
  61     pa_module *module;
  62     pa_memchunk chunk;
  63 };
  64
  65 static const char* const valid_modargs[] = {
  66     "file",
  67     "rate",
  68     "channels",
  69     "format",
  70     "source_name",
  71     NULL
  72 };
  73
  74 static void do_read(struct userdata *u) {
  75     ssize_t r;
  76     pa_memchunk chunk;
  77     assert(u);
  78
  79     if (!pa_iochannel_is_readable(u->io))
  80         return;
  81
  82     pa_module_set_used(u->module, pa_idxset_size(u->source->outputs));
  83
  84     if (!u->chunk.memblock) {
  85         u->chunk.memblock = pa_memblock_new(1024, u->core->memblock_stat);
  86         u->chunk.index = chunk.length = 0;
  87     }
  88
  89     assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
  90     if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
  91         pa_log(__FILE__": read() failed: %s", strerror(errno));
  92         return;
  93     }
  94
  95     u->chunk.length = r;
  96     pa_source_post(u->source, &u->chunk);
  97     u->chunk.index += r;
  98
  99     if (u->chunk.index >= u->chunk.memblock->length) {
 100         u->chunk.index = u->chunk.length = 0;
 101         pa_memblock_unref(u->chunk.memblock);
 102         u->chunk.memblock = NULL;
 103     }
 104 }
 105
 106 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 107     struct userdata *u = userdata;
 108     assert(u);
 109     do_read(u);
 110 }
 111
 112 int pa__init(pa_core *c, pa_module*m) {
 113     struct userdata *u = NULL;
 114     struct stat st;
 115     const char *p;
 116     int fd = -1;
 117     pa_sample_spec ss;
 118     pa_modargs *ma = NULL;
 119     assert(c && m);
 120
 121     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 122         pa_log(__FILE__": failed to parse module arguments");
 123         goto fail;
 124     }
 125
 126     ss = c->default_sample_spec;
 127     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 128         pa_log(__FILE__": invalid sample format specification");
 129         goto fail;
 130     }
 131
 132     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 133
 134     if ((fd = open(p, O_RDWR)) < 0) {
 135         pa_log(__FILE__": open('%s'): %s", p, strerror(errno));
 136         goto fail;
 137     }
 138
 139     pa_fd_set_cloexec(fd, 1);
 140
 141     if (fstat(fd, &st) < 0) {
 142         pa_log(__FILE__": fstat('%s'): %s", p, strerror(errno));
 143         goto fail;
 144     }
 145
 146     if (!S_ISFIFO(st.st_mode)) {
 147         pa_log(__FILE__": '%s' is not a FIFO.", p);
 148         goto fail;
 149     }
 150
 151     u = pa_xmalloc0(sizeof(struct userdata));
 152
 153     u->filename = pa_xstrdup(p);
 154     u->core = c;
 155
 156     if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, NULL))) {
 157         pa_log(__FILE__": failed to create source.");
 158         goto fail;
 159     }
 160     u->source->userdata = u;
 161     pa_source_set_owner(u->source, m);
 162     u->source->description = pa_sprintf_malloc("Unix FIFO source '%s'", p);
 163     assert(u->source->description);
 164
 165     u->io = pa_iochannel_new(c->mainloop, fd, -1);
 166     assert(u->io);
 167     pa_iochannel_set_callback(u->io, io_callback, u);
 168
 169     u->chunk.memblock = NULL;
 170     u->chunk.index = u->chunk.length = 0;
 171
 172     u->module = m;
 173     m->userdata = u;
 174
 175     pa_modargs_free(ma);
 176
 177     return 0;
 178
 179 fail:
 180     if (ma)
 181         pa_modargs_free(ma);
 182
 183     if (fd >= 0)
 184         close(fd);
 185
 186     pa__done(c, m);
 187
 188     return -1;
 189 }
 190
 191 void pa__done(pa_core *c, pa_module*m) {
 192     struct userdata *u;
 193     assert(c && m);
 194
 195     if (!(u = m->userdata))
 196         return;
 197
 198     if (u->chunk.memblock)
 199         pa_memblock_unref(u->chunk.memblock);
 200
 201     pa_source_disconnect(u->source);
 202     pa_source_unref(u->source);
 203     pa_iochannel_free(u->io);
 204
 205     assert(u->filename);
 206     unlink(u->filename);
 207     pa_xfree(u->filename);
 208
 209     pa_xfree(u);
 210 }