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 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 "sink.h"
  38 #include "module.h"
  39 #include "util.h"
  40 #include "modargs.h"
  41 #include "xmalloc.h"
  42 #include "log.h"
  43 #include "module-null-sink-symdef.h"
  44
  45 PA_MODULE_AUTHOR("Lennart Poettering")
  46 PA_MODULE_DESCRIPTION("Clocked NULL sink")
  47 PA_MODULE_VERSION(PACKAGE_VERSION)
  48 PA_MODULE_USAGE("format=<sample format> channels=<number of channels> rate=<sample rate> sink_name=<name of sink>")
  49
  50 #define DEFAULT_SINK_NAME "null"
  51
  52 struct userdata {
  53     struct pa_core *core;
  54     struct pa_module *module;
  55     struct pa_sink *sink;
  56     struct pa_time_event *time_event;
  57     size_t block_size;
  58 };
  59
  60 static const char* const valid_modargs[] = {
  61     "rate",
  62     "format",
  63     "channels",
  64     "sink_name",
  65     NULL
  66 };
  67
  68 static void time_callback(struct pa_mainloop_api *m, struct pa_time_event*e, const struct timeval *tv, void *userdata) {
  69     struct userdata *u = userdata;
  70     struct pa_memchunk chunk;
  71     struct timeval ntv = *tv;
  72     size_t l;
  73
  74     assert(u);
  75
  76     if (pa_sink_render(u->sink, u->block_size, &chunk) >= 0) {
  77         l = chunk.length;
  78         pa_memblock_unref(chunk.memblock);
  79     } else
  80         l = u->block_size;
  81
  82     pa_timeval_add(&ntv, pa_bytes_to_usec(l, &u->sink->sample_spec));
  83     m->time_restart(e, &ntv);
  84 }
  85
  86 int pa__init(struct pa_core *c, struct pa_module*m) {
  87     struct userdata *u = NULL;
  88     struct pa_sample_spec ss;
  89     struct pa_modargs *ma = NULL;
  90     struct timeval tv;
  91     assert(c && m);
  92
  93     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
  94         pa_log(__FILE__": failed to parse module arguments.\n");
  95         goto fail;
  96     }
  97
  98     ss = c->default_sample_spec;
  99     if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
 100         pa_log(__FILE__": invalid sample format specification.\n");
 101         goto fail;
 102     }
 103
 104     u = pa_xmalloc0(sizeof(struct userdata));
 105     u->core = c;
 106     u->module = m;
 107     m->userdata = u;
 108
 109     if (!(u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss))) {
 110         pa_log(__FILE__": failed to create sink.\n");
 111         goto fail;
 112     }
 113
 114     u->sink->userdata = u;
 115     pa_sink_set_owner(u->sink, m);
 116     u->sink->description = pa_sprintf_malloc("NULL sink");
 117
 118     gettimeofday(&tv, NULL);
 119     u->time_event = c->mainloop->time_new(c->mainloop, &tv, time_callback, u);
 120
 121     u->block_size = pa_bytes_per_second(&ss) / 10;
 122
 123     pa_modargs_free(ma);
 124
 125     return 0;
 126
 127 fail:
 128     if (ma)
 129         pa_modargs_free(ma);
 130
 131     pa__done(c, m);
 132
 133     return -1;
 134 }
 135
 136 void pa__done(struct pa_core *c, struct pa_module*m) {
 137     struct userdata *u;
 138     assert(c && m);
 139
 140     if (!(u = m->userdata))
 141         return;
 142
 143     pa_sink_disconnect(u->sink);
 144     pa_sink_unref(u->sink);
 145
 146     u->core->mainloop->time_free(u->time_event);
 147
 148     pa_xfree(u);
 149 }