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 <polyp/xmalloc.h>
  37
  38 #include <polypcore/iochannel.h>
  39 #include <polypcore/source.h>
  40 #include <polypcore/module.h>
  41 #include <polypcore/util.h>
  42 #include <polypcore/modargs.h>
  43 #include <polypcore/log.h>
  44
  45 #include "module-pipe-source-symdef.h"
  46
  47 PA_MODULE_AUTHOR("Lennart Poettering")
  48 PA_MODULE_DESCRIPTION("UNIX pipe source")
  49 PA_MODULE_VERSION(PACKAGE_VERSION)
  50 PA_MODULE_USAGE(
  51         "source_name=<name for the source> "
  52         "file=<path of the FIFO> "
  53         "format=<sample format> "
  54         "channels=<number of channels> "
  55         "rate=<sample rate> "
  56         "channel_map=<channel map>")
  57
  58 #define DEFAULT_FIFO_NAME "/tmp/music.input"
  59 #define DEFAULT_SOURCE_NAME "fifo_input"
  60
  61 struct userdata {
  62     pa_core *core;
  63
  64     char *filename;
  65
  66     pa_source *source;
  67     pa_iochannel *io;
  68     pa_module *module;
  69     pa_memchunk chunk;
  70 };
  71
  72 static const char* const valid_modargs[] = {
  73     "file",
  74     "rate",
  75     "channels",
  76     "format",
  77     "source_name",
  78     "channel_map",
  79     NULL
  80 };
  81
  82 static void do_read(struct userdata *u) {
  83     ssize_t r;
  84     pa_memchunk chunk;
  85     assert(u);
  86
  87     if (!pa_iochannel_is_readable(u->io))
  88         return;
  89
  90     pa_module_set_used(u->module, pa_idxset_size(u->source->outputs));
  91
  92     if (!u->chunk.memblock) {
  93         u->chunk.memblock = pa_memblock_new(1024, u->core->memblock_stat);
  94         u->chunk.index = chunk.length = 0;
  95     }
  96
  97     assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
  98     if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
  99         pa_log(__FILE__": read() failed: %s", strerror(errno));
 100         return;
 101     }
 102
 103     u->chunk.length = r;
 104     pa_source_post(u->source, &u->chunk);
 105     u->chunk.index += r;
 106
 107     if (u->chunk.index >= u->chunk.memblock->length) {
 108         u->chunk.index = u->chunk.length = 0;
 109         pa_memblock_unref(u->chunk.memblock);
 110         u->chunk.memblock = NULL;
 111     }
 112 }
 113
 114 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 115     struct userdata *u = userdata;
 116     assert(u);
 117     do_read(u);
 118 }
 119
 120 int pa__init(pa_core *c, pa_module*m) {
 121     struct userdata *u = NULL;
 122     struct stat st;
 123     const char *p;
 124     int fd = -1;
 125     pa_sample_spec ss;
 126     pa_channel_map map;
 127     pa_modargs *ma = NULL;
 128     assert(c && m);
 129
 130     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 131         pa_log(__FILE__": failed to parse module arguments");
 132         goto fail;
 133     }
 134
 135     ss = c->default_sample_spec;
 136     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 137         pa_log(__FILE__": invalid sample format specification or channel map");
 138         goto fail;
 139     }
 140
 141     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 142
 143     if ((fd = open(p, O_RDWR)) < 0) {
 144         pa_log(__FILE__": open('%s'): %s", p, strerror(errno));
 145         goto fail;
 146     }
 147
 148     pa_fd_set_cloexec(fd, 1);
 149
 150     if (fstat(fd, &st) < 0) {
 151         pa_log(__FILE__": fstat('%s'): %s", p, strerror(errno));
 152         goto fail;
 153     }
 154
 155     if (!S_ISFIFO(st.st_mode)) {
 156         pa_log(__FILE__": '%s' is not a FIFO.", p);
 157         goto fail;
 158     }
 159
 160     u = pa_xmalloc0(sizeof(struct userdata));
 161
 162     u->filename = pa_xstrdup(p);
 163     u->core = c;
 164
 165     if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map))) {
 166         pa_log(__FILE__": failed to create source.");
 167         goto fail;
 168     }
 169     u->source->userdata = u;
 170     pa_source_set_owner(u->source, m);
 171     u->source->description = pa_sprintf_malloc("Unix FIFO source '%s'", p);
 172     assert(u->source->description);
 173
 174     u->io = pa_iochannel_new(c->mainloop, fd, -1);
 175     assert(u->io);
 176     pa_iochannel_set_callback(u->io, io_callback, u);
 177
 178     u->chunk.memblock = NULL;
 179     u->chunk.index = u->chunk.length = 0;
 180
 181     u->module = m;
 182     m->userdata = u;
 183
 184     pa_modargs_free(ma);
 185
 186     return 0;
 187
 188 fail:
 189     if (ma)
 190         pa_modargs_free(ma);
 191
 192     if (fd >= 0)
 193         close(fd);
 194
 195     pa__done(c, m);
 196
 197     return -1;
 198 }
 199
 200 void pa__done(pa_core *c, pa_module*m) {
 201     struct userdata *u;
 202     assert(c && m);
 203
 204     if (!(u = m->userdata))
 205         return;
 206
 207     if (u->chunk.memblock)
 208         pa_memblock_unref(u->chunk.memblock);
 209
 210     pa_source_disconnect(u->source);
 211     pa_source_unref(u->source);
 212     pa_iochannel_free(u->io);
 213
 214     assert(u->filename);
 215     unlink(u->filename);
 216     pa_xfree(u->filename);
 217
 218     pa_xfree(u);
 219 }