code.delx.au - pulseaudio/blob - polyp/module-null-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 #include "log.h"
  43
  44 PA_MODULE_AUTHOR("Lennart Poettering")
  45 PA_MODULE_DESCRIPTION("Clocked NULL sink")
  46 PA_MODULE_VERSION(PACKAGE_VERSION)
  47 PA_MODULE_USAGE("format=<sample format> channels=<number of channels> rate=<sample rate> sink_name=<name of sink>")
  48
  49 #define DEFAULT_SINK_NAME "null"
  50
  51 struct userdata {
  52     struct pa_core *core;
  53     struct pa_module *module;
  54     struct pa_sink *sink;
  55     struct pa_time_event *time_event;
  56     size_t block_size;
  57 };
  58
  59 static const char* const valid_modargs[] = {
  60     "rate",
  61     "format",
  62     "channels",
  63     "sink_name",
  64     NULL
  65 };
  66
  67 static void time_callback(struct pa_mainloop_api *m, struct pa_time_event*e, const struct timeval *tv, void *userdata) {
  68     struct userdata *u = userdata;
  69     struct pa_memchunk chunk;
  70     struct timeval ntv = *tv;
  71     size_t l;
  72
  73     assert(u);
  74
  75     if (pa_sink_render(u->sink, u->block_size, &chunk) >= 0) {
  76         l = chunk.length;
  77         pa_memblock_unref(chunk.memblock);
  78     } else
  79         l = u->block_size;
  80
  81     pa_timeval_add(&ntv, pa_bytes_to_usec(l, &u->sink->sample_spec));
  82     m->time_restart(e, &ntv);
  83 }
  84
  85 int pa__init(struct pa_core *c, struct pa_module*m) {
  86     struct userdata *u = NULL;
  87     struct pa_sample_spec ss;
  88     struct pa_modargs *ma = NULL;
  89     struct timeval tv;
  90     assert(c && m);
  91
  92     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
  93         pa_log(__FILE__": failed to parse module arguments.\n");
  94         goto fail;
  95     }
  96
  97     ss = c->default_sample_spec;
  98     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
  99         pa_log(__FILE__": invalid sample format specification.\n");
 100         goto fail;
 101     }
 102
 103     u = pa_xmalloc0(sizeof(struct userdata));
 104     u->core = c;
 105     u->module = m;
 106     m->userdata = u;
 107
 108     if (!(u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss))) {
 109         pa_log(__FILE__": failed to create sink.\n");
 110         goto fail;
 111     }
 112
 113     u->sink->userdata = u;
 114     pa_sink_set_owner(u->sink, m);
 115     u->sink->description = pa_sprintf_malloc("NULL sink");
 116
 117     gettimeofday(&tv, NULL);
 118     u->time_event = c->mainloop->time_new(c->mainloop, &tv, time_callback, u);
 119
 120     u->block_size = pa_bytes_per_second(&ss) / 10;
 121
 122     pa_modargs_free(ma);
 123
 124     return 0;
 125
 126 fail:
 127     if (ma)
 128         pa_modargs_free(ma);
 129
 130     pa__done(c, m);
 131
 132     return -1;
 133 }
 134
 135 void pa__done(struct pa_core *c, struct pa_module*m) {
 136     struct userdata *u;
 137     assert(c && m);
 138
 139     if (!(u = m->userdata))
 140         return;
 141
 142     pa_sink_disconnect(u->sink);
 143     pa_sink_unref(u->sink);
 144
 145     u->core->mainloop->time_free(u->time_event);
 146
 147     pa_xfree(u);
 148 }