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