code.delx.au - pulseaudio/blob - src/modules/module-pipe-source.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   PulseAudio 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   PulseAudio 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 PulseAudio; 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 <pulse/xmalloc.h>
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/iochannel.h>
  40 #include <pulsecore/source.h>
  41 #include <pulsecore/module.h>
  42 #include <pulsecore/core-util.h>
  43 #include <pulsecore/modargs.h>
  44 #include <pulsecore/log.h>
  45
  46 #include "module-pipe-source-symdef.h"
  47
  48 PA_MODULE_AUTHOR("Lennart Poettering")
  49 PA_MODULE_DESCRIPTION("UNIX pipe source")
  50 PA_MODULE_VERSION(PACKAGE_VERSION)
  51 PA_MODULE_USAGE(
  52         "source_name=<name for the source> "
  53         "file=<path of the FIFO> "
  54         "format=<sample format> "
  55         "channels=<number of channels> "
  56         "rate=<sample rate> "
  57         "channel_map=<channel map>")
  58
  59 #define DEFAULT_FIFO_NAME "/tmp/music.input"
  60 #define DEFAULT_SOURCE_NAME "fifo_input"
  61
  62 struct userdata {
  63     pa_core *core;
  64
  65     char *filename;
  66
  67     pa_source *source;
  68     pa_iochannel *io;
  69     pa_module *module;
  70     pa_memchunk chunk;
  71 };
  72
  73 static const char* const valid_modargs[] = {
  74     "file",
  75     "rate",
  76     "channels",
  77     "format",
  78     "source_name",
  79     "channel_map",
  80     NULL
  81 };
  82
  83 static void do_read(struct userdata *u) {
  84     ssize_t r;
  85     pa_memchunk chunk;
  86     assert(u);
  87
  88     if (!pa_iochannel_is_readable(u->io))
  89         return;
  90
  91     pa_module_set_used(u->module, pa_idxset_size(u->source->outputs));
  92
  93     if (!u->chunk.memblock) {
  94         u->chunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
  95         u->chunk.index = chunk.length = 0;
  96     }
  97
  98     assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
  99     if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
 100         pa_log("read(): %s", pa_cstrerror(errno));
 101         return;
 102     }
 103
 104     u->chunk.length = r;
 105     pa_source_post(u->source, &u->chunk);
 106     u->chunk.index += r;
 107
 108     if (u->chunk.index >= u->chunk.memblock->length) {
 109         u->chunk.index = u->chunk.length = 0;
 110         pa_memblock_unref(u->chunk.memblock);
 111         u->chunk.memblock = NULL;
 112     }
 113 }
 114
 115 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 116     struct userdata *u = userdata;
 117     assert(u);
 118     do_read(u);
 119 }
 120
 121 int pa__init(pa_core *c, pa_module*m) {
 122     struct userdata *u = NULL;
 123     struct stat st;
 124     const char *p;
 125     int fd = -1;
 126     pa_sample_spec ss;
 127     pa_channel_map map;
 128     pa_modargs *ma = NULL;
 129     char *t;
 130
 131     assert(c && m);
 132
 133     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 134         pa_log("failed to parse module arguments");
 135         goto fail;
 136     }
 137
 138     ss = c->default_sample_spec;
 139     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 140         pa_log("invalid sample format specification or channel map");
 141         goto fail;
 142     }
 143
 144     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 145
 146     if ((fd = open(p, O_RDWR)) < 0) {
 147         pa_log("open('%s'): %s", p, pa_cstrerror(errno));
 148         goto fail;
 149     }
 150
 151     pa_fd_set_cloexec(fd, 1);
 152
 153     if (fstat(fd, &st) < 0) {
 154         pa_log("fstat('%s'): %s", p, pa_cstrerror(errno));
 155         goto fail;
 156     }
 157
 158     if (!S_ISFIFO(st.st_mode)) {
 159         pa_log("'%s' is not a FIFO.", p);
 160         goto fail;
 161     }
 162
 163     u = pa_xmalloc0(sizeof(struct userdata));
 164
 165     u->filename = pa_xstrdup(p);
 166     u->core = c;
 167
 168     if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map))) {
 169         pa_log("failed to create source.");
 170         goto fail;
 171     }
 172     u->source->userdata = u;
 173     pa_source_set_owner(u->source, m);
 174     pa_source_set_description(u->source, t = pa_sprintf_malloc("Unix FIFO source '%s'", p));
 175     pa_xfree(t);
 176
 177     u->io = pa_iochannel_new(c->mainloop, fd, -1);
 178     assert(u->io);
 179     pa_iochannel_set_callback(u->io, io_callback, u);
 180
 181     u->chunk.memblock = NULL;
 182     u->chunk.index = u->chunk.length = 0;
 183
 184     u->module = m;
 185     m->userdata = u;
 186
 187     pa_modargs_free(ma);
 188
 189     return 0;
 190
 191 fail:
 192     if (ma)
 193         pa_modargs_free(ma);
 194
 195     if (fd >= 0)
 196         close(fd);
 197
 198     pa__done(c, m);
 199
 200     return -1;
 201 }
 202
 203 void pa__done(pa_core *c, pa_module*m) {
 204     struct userdata *u;
 205     assert(c && m);
 206
 207     if (!(u = m->userdata))
 208         return;
 209
 210     if (u->chunk.memblock)
 211         pa_memblock_unref(u->chunk.memblock);
 212
 213     pa_source_disconnect(u->source);
 214     pa_source_unref(u->source);
 215     pa_iochannel_free(u->io);
 216
 217     assert(u->filename);
 218     unlink(u->filename);
 219     pa_xfree(u->filename);
 220
 221     pa_xfree(u);
 222 }