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