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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdlib.h>
  29 #include <sys/stat.h>
  30 #include <stdio.h>
  31 #include <assert.h>
  32 #include <errno.h>
  33 #include <string.h>
  34 #include <fcntl.h>
  35 #include <unistd.h>
  36 #include <limits.h>
  37
  38 #include <pulse/xmalloc.h>
  39
  40 #include <pulsecore/core-error.h>
  41 #include <pulsecore/iochannel.h>
  42 #include <pulsecore/source.h>
  43 #include <pulsecore/module.h>
  44 #include <pulsecore/core-util.h>
  45 #include <pulsecore/modargs.h>
  46 #include <pulsecore/log.h>
  47
  48 #include "module-pipe-source-symdef.h"
  49
  50 PA_MODULE_AUTHOR("Lennart Poettering")
  51 PA_MODULE_DESCRIPTION("UNIX pipe source")
  52 PA_MODULE_VERSION(PACKAGE_VERSION)
  53 PA_MODULE_USAGE(
  54         "source_name=<name for the source> "
  55         "file=<path of the FIFO> "
  56         "format=<sample format> "
  57         "channels=<number of channels> "
  58         "rate=<sample rate> "
  59         "channel_map=<channel map>")
  60
  61 #define DEFAULT_FIFO_NAME "/tmp/music.input"
  62 #define DEFAULT_SOURCE_NAME "fifo_input"
  63
  64 struct userdata {
  65     pa_core *core;
  66
  67     char *filename;
  68
  69     pa_source *source;
  70     pa_iochannel *io;
  71     pa_module *module;
  72     pa_memchunk chunk;
  73 };
  74
  75 static const char* const valid_modargs[] = {
  76     "file",
  77     "rate",
  78     "channels",
  79     "format",
  80     "source_name",
  81     "channel_map",
  82     NULL
  83 };
  84
  85 static void do_read(struct userdata *u) {
  86     ssize_t r;
  87     pa_memchunk chunk;
  88     assert(u);
  89
  90     if (!pa_iochannel_is_readable(u->io))
  91         return;
  92
  93     pa_module_set_used(u->module, pa_idxset_size(u->source->outputs));
  94
  95     if (!u->chunk.memblock) {
  96         u->chunk.memblock = pa_memblock_new(u->core->mempool, PIPE_BUF);
  97         u->chunk.index = chunk.length = 0;
  98     }
  99
 100     assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
 101     if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
 102         pa_log("read(): %s", pa_cstrerror(errno));
 103         return;
 104     }
 105
 106     u->chunk.length = r;
 107     pa_source_post(u->source, &u->chunk);
 108     u->chunk.index += r;
 109
 110     if (u->chunk.index >= u->chunk.memblock->length) {
 111         u->chunk.index = u->chunk.length = 0;
 112         pa_memblock_unref(u->chunk.memblock);
 113         u->chunk.memblock = NULL;
 114     }
 115 }
 116
 117 static void io_callback(PA_GCC_UNUSED pa_iochannel *io, void*userdata) {
 118     struct userdata *u = userdata;
 119     assert(u);
 120     do_read(u);
 121 }
 122
 123 int pa__init(pa_core *c, pa_module*m) {
 124     struct userdata *u = NULL;
 125     struct stat st;
 126     const char *p;
 127     int fd = -1;
 128     pa_sample_spec ss;
 129     pa_channel_map map;
 130     pa_modargs *ma = NULL;
 131     char *t;
 132
 133     assert(c && m);
 134
 135     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 136         pa_log("failed to parse module arguments");
 137         goto fail;
 138     }
 139
 140     ss = c->default_sample_spec;
 141     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
 142         pa_log("invalid sample format specification or channel map");
 143         goto fail;
 144     }
 145
 146     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 147
 148     if ((fd = open(p, O_RDWR)) < 0) {
 149         pa_log("open('%s'): %s", p, pa_cstrerror(errno));
 150         goto fail;
 151     }
 152
 153     pa_fd_set_cloexec(fd, 1);
 154
 155     if (fstat(fd, &st) < 0) {
 156         pa_log("fstat('%s'): %s", p, pa_cstrerror(errno));
 157         goto fail;
 158     }
 159
 160     if (!S_ISFIFO(st.st_mode)) {
 161         pa_log("'%s' is not a FIFO.", p);
 162         goto fail;
 163     }
 164
 165     u = pa_xmalloc0(sizeof(struct userdata));
 166
 167     u->filename = pa_xstrdup(p);
 168     u->core = c;
 169
 170     if (!(u->source = pa_source_new(c, __FILE__, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss, &map))) {
 171         pa_log("failed to create source.");
 172         goto fail;
 173     }
 174     u->source->userdata = u;
 175     pa_source_set_owner(u->source, m);
 176     pa_source_set_description(u->source, t = pa_sprintf_malloc("Unix FIFO source '%s'", p));
 177     pa_xfree(t);
 178
 179     u->io = pa_iochannel_new(c->mainloop, fd, -1);
 180     assert(u->io);
 181     pa_iochannel_set_callback(u->io, io_callback, u);
 182
 183     u->chunk.memblock = NULL;
 184     u->chunk.index = u->chunk.length = 0;
 185
 186     u->module = m;
 187     m->userdata = u;
 188
 189     pa_modargs_free(ma);
 190
 191     return 0;
 192
 193 fail:
 194     if (ma)
 195         pa_modargs_free(ma);
 196
 197     if (fd >= 0)
 198         close(fd);
 199
 200     pa__done(c, m);
 201
 202     return -1;
 203 }
 204
 205 void pa__done(pa_core *c, pa_module*m) {
 206     struct userdata *u;
 207     assert(c && m);
 208
 209     if (!(u = m->userdata))
 210         return;
 211
 212     if (u->chunk.memblock)
 213         pa_memblock_unref(u->chunk.memblock);
 214
 215     pa_source_disconnect(u->source);
 216     pa_source_unref(u->source);
 217     pa_iochannel_free(u->io);
 218
 219     assert(u->filename);
 220     unlink(u->filename);
 221     pa_xfree(u->filename);
 222
 223     pa_xfree(u);
 224 }