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/* $Id$ */
/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
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 <stdio.h>
#include <math.h>
#include <pulse/xmalloc.h>
#include <pulsecore/sink-input.h>
#include <pulsecore/module.h>
#include <pulsecore/modargs.h>
#include <pulsecore/namereg.h>
#include <pulsecore/log.h>
#include <pulsecore/core-util.h>
#include "module-sine-symdef.h"
PA_MODULE_AUTHOR("Lennart Poettering");
PA_MODULE_DESCRIPTION("Sine wave generator");
PA_MODULE_VERSION(PACKAGE_VERSION);
PA_MODULE_LOAD_ONCE(FALSE);
PA_MODULE_USAGE("sink=<sink to connect to> frequency=<frequency in Hz>");
struct userdata {
pa_core *core;
pa_module *module;
pa_sink_input *sink_input;
pa_memblock *memblock;
size_t peek_index;
};
static const char* const valid_modargs[] = {
"sink",
"frequency",
NULL,
};
static int sink_input_peek_cb(pa_sink_input *i, size_t length, pa_memchunk *chunk) {
struct userdata *u;
pa_assert(i);
u = i->userdata;
pa_assert(u);
pa_assert(chunk);
chunk->memblock = pa_memblock_ref(u->memblock);
chunk->index = u->peek_index;
chunk->length = pa_memblock_get_length(u->memblock) - u->peek_index;
return 0;
}
static void sink_input_drop_cb(pa_sink_input *i, size_t length) {
struct userdata *u;
size_t l;
pa_assert(i);
u = i->userdata;
pa_assert(u);
pa_assert(length > 0);
u->peek_index += length;
l = pa_memblock_get_length(u->memblock);
while (u->peek_index >= l)
u->peek_index -= l;
}
static void sink_input_kill_cb(pa_sink_input *i) {
struct userdata *u;
pa_assert(i);
u = i->userdata;
pa_assert(u);
pa_sink_input_unlink(u->sink_input);
pa_sink_input_unref(u->sink_input);
u->sink_input = NULL;
pa_module_unload_request(u->module);
}
static void calc_sine(float *f, size_t l, float freq) {
size_t i;
l /= sizeof(float);
for (i = 0; i < l; i++)
f[i] = (float) sin((double) i/l*M_PI*2*freq)/2;
}
int pa__init(pa_module*m) {
pa_modargs *ma = NULL;
struct userdata *u;
pa_sink *sink;
pa_sample_spec ss;
uint32_t frequency;
char t[256];
void *p;
pa_sink_input_new_data data;
if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
pa_log("Failed to parse module arguments");
goto fail;
}
m->userdata = u = pa_xnew0(struct userdata, 1);
u->core = m->core;
u->module = m;
u->sink_input = NULL;
u->memblock = NULL;
u->peek_index = 0;
if (!(sink = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sink", NULL), PA_NAMEREG_SINK, 1))) {
pa_log("No such sink.");
goto fail;
}
ss.format = PA_SAMPLE_FLOAT32;
ss.rate = sink->sample_spec.rate;
ss.channels = 1;
frequency = 440;
if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
pa_log("Invalid frequency specification");
goto fail;
}
u->memblock = pa_memblock_new(m->core->mempool, pa_bytes_per_second(&ss));
p = pa_memblock_acquire(u->memblock);
calc_sine(p, pa_memblock_get_length(u->memblock), frequency);
pa_memblock_release(u->memblock);
pa_snprintf(t, sizeof(t), "Sine Generator at %u Hz", frequency);
pa_sink_input_new_data_init(&data);
data.sink = sink;
data.driver = __FILE__;
data.name = t;
pa_sink_input_new_data_set_sample_spec(&data, &ss);
data.module = m;
if (!(u->sink_input = pa_sink_input_new(m->core, &data, 0)))
goto fail;
u->sink_input->peek = sink_input_peek_cb;
u->sink_input->drop = sink_input_drop_cb;
u->sink_input->kill = sink_input_kill_cb;
u->sink_input->userdata = u;
pa_sink_input_put(u->sink_input);
pa_modargs_free(ma);
return 0;
fail:
if (ma)
pa_modargs_free(ma);
pa__done(m);
return -1;
}
void pa__done(pa_module*m) {
struct userdata *u;
pa_assert(m);
if (!(u = m->userdata))
return;
if (u->sink_input) {
pa_sink_input_unlink(u->sink_input);
pa_sink_input_unref(u->sink_input);
}
if (u->memblock)
pa_memblock_unref(u->memblock);
pa_xfree(u);
}
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