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