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