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/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
polypaudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <sys/stat.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include "iochannel.h"
#include "sink.h"
#include "module.h"
#include "util.h"
#include "modargs.h"
#include "xmalloc.h"
#include "log.h"
#include "module-null-sink-symdef.h"
PA_MODULE_AUTHOR("Lennart Poettering")
PA_MODULE_DESCRIPTION("Clocked NULL sink")
PA_MODULE_VERSION(PACKAGE_VERSION)
PA_MODULE_USAGE("format=<sample format> channels=<number of channels> rate=<sample rate> sink_name=<name of sink>")
#define DEFAULT_SINK_NAME "null"
struct userdata {
struct pa_core *core;
struct pa_module *module;
struct pa_sink *sink;
struct pa_time_event *time_event;
size_t block_size;
};
static const char* const valid_modargs[] = {
"rate",
"format",
"channels",
"sink_name",
NULL
};
static void time_callback(struct pa_mainloop_api *m, struct pa_time_event*e, const struct timeval *tv, void *userdata) {
struct userdata *u = userdata;
struct pa_memchunk chunk;
struct timeval ntv = *tv;
size_t l;
assert(u);
if (pa_sink_render(u->sink, u->block_size, &chunk) >= 0) {
l = chunk.length;
pa_memblock_unref(chunk.memblock);
} else
l = u->block_size;
pa_timeval_add(&ntv, pa_bytes_to_usec(l, &u->sink->sample_spec));
m->time_restart(e, &ntv);
}
int pa__init(struct pa_core *c, struct pa_module*m) {
struct userdata *u = NULL;
struct pa_sample_spec ss;
struct pa_modargs *ma = NULL;
struct timeval tv;
assert(c && m);
if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
pa_log(__FILE__": failed to parse module arguments.\n");
goto fail;
}
ss = c->default_sample_spec;
if (pa_modargs_get_sample_spec(ma, &ss) < 0) {
pa_log(__FILE__": invalid sample format specification.\n");
goto fail;
}
u = pa_xmalloc0(sizeof(struct userdata));
u->core = c;
u->module = m;
m->userdata = u;
if (!(u->sink = pa_sink_new(c, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss))) {
pa_log(__FILE__": failed to create sink.\n");
goto fail;
}
u->sink->userdata = u;
pa_sink_set_owner(u->sink, m);
u->sink->description = pa_sprintf_malloc("NULL sink");
gettimeofday(&tv, NULL);
u->time_event = c->mainloop->time_new(c->mainloop, &tv, time_callback, u);
u->block_size = pa_bytes_per_second(&ss) / 10;
pa_modargs_free(ma);
return 0;
fail:
if (ma)
pa_modargs_free(ma);
pa__done(c, m);
return -1;
}
void pa__done(struct pa_core *c, struct pa_module*m) {
struct userdata *u;
assert(c && m);
if (!(u = m->userdata))
return;
pa_sink_disconnect(u->sink);
pa_sink_unref(u->sink);
u->core->mainloop->time_free(u->time_event);
pa_xfree(u);
}
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