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 #define PA_TYPEID_PIPE PA_TYPEID_MAKE('P', 'I', 'P', 'E')
  54
  55 struct userdata {
  56     struct pa_core *core;
  57
  58     char *filename;
  59
  60     struct pa_source *source;
  61     struct pa_iochannel *io;
  62     struct pa_module *module;
  63     struct pa_memchunk chunk;
  64 };
  65
  66 static const char* const valid_modargs[] = {
  67     "file",
  68     "rate",
  69     "channels",
  70     "format",
  71     "source_name",
  72     NULL
  73 };
  74
  75 static void do_read(struct userdata *u) {
  76     ssize_t r;
  77     struct pa_memchunk chunk;
  78     assert(u);
  79
  80     if (!pa_iochannel_is_readable(u->io))
  81         return;
  82
  83     pa_module_set_used(u->module, pa_idxset_ncontents(u->source->outputs));
  84
  85     if (!u->chunk.memblock) {
  86         u->chunk.memblock = pa_memblock_new(1024, u->core->memblock_stat);
  87         u->chunk.index = chunk.length = 0;
  88     }
  89
  90     assert(u->chunk.memblock && u->chunk.memblock->length > u->chunk.index);
  91     if ((r = pa_iochannel_read(u->io, (uint8_t*) u->chunk.memblock->data + u->chunk.index, u->chunk.memblock->length - u->chunk.index)) <= 0) {
  92         pa_log(__FILE__": read() failed: %s\n", strerror(errno));
  93         return;
  94     }
  95
  96     u->chunk.length = r;
  97     pa_source_post(u->source, &u->chunk);
  98     u->chunk.index += r;
  99
 100     if (u->chunk.index >= u->chunk.memblock->length) {
 101         u->chunk.index = u->chunk.length = 0;
 102         pa_memblock_unref(u->chunk.memblock);
 103         u->chunk.memblock = NULL;
 104     }
 105 }
 106
 107 static void io_callback(struct pa_iochannel *io, void*userdata) {
 108     struct userdata *u = userdata;
 109     assert(u);
 110     do_read(u);
 111 }
 112
 113 int pa__init(struct pa_core *c, struct pa_module*m) {
 114     struct userdata *u = NULL;
 115     struct stat st;
 116     const char *p;
 117     int fd = -1;
 118     struct pa_sample_spec ss;
 119     struct pa_modargs *ma = NULL;
 120     assert(c && m);
 121
 122     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 123         pa_log(__FILE__": failed to parse module arguments\n");
 124         goto fail;
 125     }
 126
 127     ss = c->default_sample_spec;
 128     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 129         pa_log(__FILE__": invalid sample format specification\n");
 130         goto fail;
 131     }
 132
 133     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 134
 135     if ((fd = open(p, O_RDWR)) < 0) {
 136         pa_log(__FILE__": open('%s'): %s\n", p, strerror(errno));
 137         goto fail;
 138     }
 139
 140     pa_fd_set_cloexec(fd, 1);
 141
 142     if (fstat(fd, &st) < 0) {
 143         pa_log(__FILE__": fstat('%s'): %s\n", p, strerror(errno));
 144         goto fail;
 145     }
 146
 147     if (!S_ISFIFO(st.st_mode)) {
 148         pa_log(__FILE__": '%s' is not a FIFO.\n", p);
 149         goto fail;
 150     }
 151
 152     u = pa_xmalloc0(sizeof(struct userdata));
 153
 154     u->filename = pa_xstrdup(p);
 155     u->core = c;
 156
 157     if (!(u->source = pa_source_new(c, PA_TYPEID_PIPE, pa_modargs_get_value(ma, "source_name", DEFAULT_SOURCE_NAME), 0, &ss))) {
 158         pa_log(__FILE__": failed to create source.\n");
 159         goto fail;
 160     }
 161     u->source->userdata = u;
 162     pa_source_set_owner(u->source, m);
 163     u->source->description = pa_sprintf_malloc("Unix FIFO source '%s'", p);
 164     assert(u->source->description);
 165
 166     u->io = pa_iochannel_new(c->mainloop, fd, -1);
 167     assert(u->io);
 168     pa_iochannel_set_callback(u->io, io_callback, u);
 169
 170     u->chunk.memblock = NULL;
 171     u->chunk.index = u->chunk.length = 0;
 172
 173     u->module = m;
 174     m->userdata = u;
 175
 176     pa_modargs_free(ma);
 177
 178     return 0;
 179
 180 fail:
 181     if (ma)
 182         pa_modargs_free(ma);
 183
 184     if (fd >= 0)
 185         close(fd);
 186
 187     pa__done(c, m);
 188
 189     return -1;
 190 }
 191
 192 void pa__done(struct pa_core *c, struct pa_module*m) {
 193     struct userdata *u;
 194     assert(c && m);
 195
 196     if (!(u = m->userdata))
 197         return;
 198
 199     if (u->chunk.memblock)
 200         pa_memblock_unref(u->chunk.memblock);
 201
 202     pa_source_disconnect(u->source);
 203     pa_source_unref(u->source);
 204     pa_iochannel_free(u->io);
 205
 206     assert(u->filename);
 207     unlink(u->filename);
 208     pa_xfree(u->filename);
 209
 210     pa_xfree(u);
 211 }