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/* $Id$ */
/***
This file is part of PulseAudio.
PulseAudio 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.
PulseAudio 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 PulseAudio; 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 <pulse/timeval.h>
#include <pulse/xmalloc.h>
#include <pulsecore/iochannel.h>
#include <pulsecore/sink.h>
#include <pulsecore/module.h>
#include <pulsecore/core-util.h>
#include <pulsecore/modargs.h>
#include <pulsecore/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>"
"channel_map=<channel map>")
#define DEFAULT_SINK_NAME "null"
struct userdata {
pa_core *core;
pa_module *module;
pa_sink *sink;
pa_time_event *time_event;
size_t block_size;
uint64_t n_bytes;
struct timeval start_time;
};
static const char* const valid_modargs[] = {
"rate",
"format",
"channels",
"sink_name",
"channel_map",
NULL
};
static void time_callback(pa_mainloop_api *m, pa_time_event*e, const struct timeval *tv, void *userdata) {
struct userdata *u = userdata;
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);
u->n_bytes += l;
}
static pa_usec_t get_latency(pa_sink *s) {
struct userdata *u = s->userdata;
pa_usec_t a, b;
struct timeval now;
a = pa_timeval_diff(pa_gettimeofday(&now), &u->start_time);
b = pa_bytes_to_usec(u->n_bytes, &s->sample_spec);
return b > a ? b - a : 0;
}
int pa__init(pa_core *c, pa_module*m) {
struct userdata *u = NULL;
pa_sample_spec ss;
pa_channel_map map;
pa_modargs *ma = NULL;
assert(c);
assert(m);
if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
pa_log(__FILE__": failed to parse module arguments.");
goto fail;
}
ss = c->default_sample_spec;
if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
pa_log(__FILE__": invalid sample format specification or channel map.");
goto fail;
}
u = pa_xnew0(struct userdata, 1);
u->core = c;
u->module = m;
m->userdata = u;
if (!(u->sink = pa_sink_new(c, __FILE__, pa_modargs_get_value(ma, "sink_name", DEFAULT_SINK_NAME), 0, &ss, &map))) {
pa_log(__FILE__": failed to create sink.");
goto fail;
}
u->sink->get_latency = get_latency;
u->sink->userdata = u;
pa_sink_set_owner(u->sink, m);
u->sink->description = pa_xstrdup("NULL sink");
u->n_bytes = 0;
pa_gettimeofday(&u->start_time);
u->time_event = c->mainloop->time_new(c->mainloop, &u->start_time, 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(pa_core *c, 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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