code.delx.au - pulseaudio/blob - polyp/module-pipe-sink.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 "sink.h"
  38 #include "module.h"
  39 #include "util.h"
  40 #include "modargs.h"
  41 #include "xmalloc.h"
  42
  43 #define DEFAULT_FIFO_NAME "/tmp/musicfifo"
  44 #define DEFAULT_SINK_NAME "fifo_output"
  45
  46 struct userdata {
  47     struct pa_core *core;
  48
  49     char *filename;
  50
  51     struct pa_sink *sink;
  52     struct pa_iochannel *io;
  53     void *mainloop_source;
  54
  55     struct pa_memchunk memchunk;
  56     struct pa_module *module;
  57 };
  58
  59 static const char* const valid_modargs[] = {
  60     "file",
  61     "rate",
  62     "channels",
  63     "format",
  64     "sink_name",
  65     NULL
  66 };
  67
  68 static void do_write(struct userdata *u) {
  69     ssize_t r;
  70     assert(u);
  71
  72     u->core->mainloop->enable_fixed(u->core->mainloop, u->mainloop_source, 0);
  73
  74     if (!pa_iochannel_is_writable(u->io))
  75         return;
  76
  77     pa_module_set_used(u->module, pa_idxset_ncontents(u->sink->inputs) + pa_idxset_ncontents(u->sink->monitor_source->outputs));
  78
  79     if (!u->memchunk.length)
  80         if (pa_sink_render(u->sink, PIPE_BUF, &u->memchunk) < 0)
  81             return;
  82
  83     assert(u->memchunk.memblock && u->memchunk.length);
  84
  85     if ((r = pa_iochannel_write(u->io, u->memchunk.memblock->data + u->memchunk.index, u->memchunk.length)) < 0) {
  86         fprintf(stderr, "write() failed: %s\n", strerror(errno));
  87         return;
  88     }
  89
  90     u->memchunk.index += r;
  91     u->memchunk.length -= r;
  92
  93     if (u->memchunk.length <= 0) {
  94         pa_memblock_unref(u->memchunk.memblock);
  95         u->memchunk.memblock = NULL;
  96     }
  97 }
  98
  99 static void notify_cb(struct pa_sink*s) {
 100     struct userdata *u = s->userdata;
 101     assert(s && u);
 102
 103     if (pa_iochannel_is_writable(u->io))
 104         u->core->mainloop->enable_fixed(u->core->mainloop, u->mainloop_source, 1);
 105 }
 106
 107 static void fixed_callback(struct pa_mainloop_api *m, void *id, void *userdata) {
 108     struct userdata *u = userdata;
 109     assert(u);
 110     do_write(u);
 111 }
 112
 113 static void io_callback(struct pa_iochannel *io, void*userdata) {
 114     struct userdata *u = userdata;
 115     assert(u);
 116     do_write(u);
 117 }
 118
 119 int pa_module_init(struct pa_core *c, struct pa_module*m) {
 120     struct userdata *u = NULL;
 121     struct stat st;
 122     const char *p;
 123     int fd = -1;
 124     struct pa_sample_spec ss;
 125     struct pa_modargs *ma = NULL;
 126     assert(c && m);
 127
 128     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 129         fprintf(stderr, __FILE__": failed to parse module arguments\n");
 130         goto fail;
 131     }
 132
 133     ss = c->default_sample_spec;
 134     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 135         fprintf(stderr, __FILE__": invalid sample format specification\n");
 136         goto fail;
 137     }
 138
 139     mkfifo(p = pa_modargs_get_value(ma, "file", DEFAULT_FIFO_NAME), 0777);
 140
 141     if ((fd = open(p, O_RDWR)) < 0) {
 142         fprintf(stderr, __FILE__": open('%s'): %s\n", p, strerror(errno));
 143         goto fail;
 144     }
 145
 146     if (fstat(fd, &st) < 0) {
 147         fprintf(stderr, __FILE__": fstat('%s'): %s\n", p, strerror(errno));
 148         goto fail;
 149     }
 150
 151     if (!S_ISFIFO(st.st_mode)) {
 152         fprintf(stderr, __FILE__": '%s' is not a FIFO.\n", p);
 153         goto fail;
 154     }
 155
 156     u = pa_xmalloc0(sizeof(struct userdata));
 157
 158     u->filename = pa_xstrdup(p);
 159     u->core = c;
 160
 161     if (!(u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss))) {
 162         fprintf(stderr, __FILE__": failed to create sink.\n");
 163         goto fail;
 164     }
 165     u->sink->notify = notify_cb;
 166     u->sink->userdata = u;
 167     pa_sink_set_owner(u->sink, m);
 168     u->sink->description = pa_sprintf_malloc("Unix FIFO sink '%s'", p);
 169     assert(u->sink->description);
 170
 171     u->io = pa_iochannel_new(c->mainloop, -1, fd);
 172     assert(u->io);
 173     pa_iochannel_set_callback(u->io, io_callback, u);
 174
 175     u->memchunk.memblock = NULL;
 176     u->memchunk.length = 0;
 177
 178     u->mainloop_source = c->mainloop->source_fixed(c->mainloop, fixed_callback, u);
 179     assert(u->mainloop_source);
 180     c->mainloop->enable_fixed(c->mainloop, u->mainloop_source, 0);
 181
 182     u->module = m;
 183     m->userdata = u;
 184
 185     pa_modargs_free(ma);
 186
 187     return 0;
 188
 189 fail:
 190     if (ma)
 191         pa_modargs_free(ma);
 192
 193     if (fd >= 0)
 194         close(fd);
 195
 196     pa_module_done(c, m);
 197
 198     return -1;
 199 }
 200
 201 void pa_module_done(struct pa_core *c, struct pa_module*m) {
 202     struct userdata *u;
 203     assert(c && m);
 204
 205     if (!(u = m->userdata))
 206         return;
 207
 208     if (u->memchunk.memblock)
 209         pa_memblock_unref(u->memchunk.memblock);
 210
 211     pa_sink_free(u->sink);
 212     pa_iochannel_free(u->io);
 213     u->core->mainloop->cancel_fixed(u->core->mainloop, u->mainloop_source);
 214
 215     assert(u->filename);
 216     unlink(u->filename);
 217     pa_xfree(u->filename);
 218
 219     pa_xfree(u);
 220 }