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