4 This file is part of PulseAudio.
6 Copyright 2004-2006 Lennart Poettering
8 PulseAudio is free software; you can redistribute it and/or modify
9 it under the terms of the GNU Lesser General Public License as published
10 by the Free Software Foundation; either version 2 of the License,
11 or (at your option) any later version.
13 PulseAudio is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with PulseAudio; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
31 #include <pulse/xmalloc.h>
33 #include <pulsecore/sink-input.h>
34 #include <pulsecore/module.h>
35 #include <pulsecore/modargs.h>
36 #include <pulsecore/namereg.h>
37 #include <pulsecore/log.h>
38 #include <pulsecore/core-util.h>
40 #include "module-sine-symdef.h"
42 PA_MODULE_AUTHOR("Lennart Poettering")
43 PA_MODULE_DESCRIPTION("Sine wave generator")
44 PA_MODULE_USAGE("sink=<sink to connect to> frequency=<frequency in Hz>")
45 PA_MODULE_VERSION(PACKAGE_VERSION)
50 pa_sink_input *sink_input;
51 pa_memblock *memblock;
55 static const char* const valid_modargs[] = {
61 static int sink_input_peek_cb(pa_sink_input *i, pa_memchunk *chunk) {
69 chunk->memblock = pa_memblock_ref(u->memblock);
70 chunk->index = u->peek_index;
71 chunk->length = pa_memblock_get_length(u->memblock) - u->peek_index;
76 static void sink_input_drop_cb(pa_sink_input *i, size_t length) {
83 pa_assert(length > 0);
85 u->peek_index += length;
87 l = pa_memblock_get_length(u->memblock);
89 while (u->peek_index >= l)
93 static void sink_input_kill_cb(pa_sink_input *i) {
100 pa_sink_input_unlink(u->sink_input);
101 pa_sink_input_unref(u->sink_input);
102 u->sink_input = NULL;
104 pa_module_unload_request(u->module);
107 static void calc_sine(float *f, size_t l, float freq) {
112 for (i = 0; i < l; i++)
113 f[i] = (float) sin((double) i/l*M_PI*2*freq)/2;
116 int pa__init(pa_module*m) {
117 pa_modargs *ma = NULL;
124 pa_sink_input_new_data data;
126 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
127 pa_log("Failed to parse module arguments");
131 m->userdata = u = pa_xnew0(struct userdata, 1);
134 u->sink_input = NULL;
138 if (!(sink = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sink", NULL), PA_NAMEREG_SINK, 1))) {
139 pa_log("No such sink.");
143 ss.format = PA_SAMPLE_FLOAT32;
144 ss.rate = sink->sample_spec.rate;
148 if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
149 pa_log("Invalid frequency specification");
153 u->memblock = pa_memblock_new(m->core->mempool, pa_bytes_per_second(&ss));
154 p = pa_memblock_acquire(u->memblock);
155 calc_sine(p, pa_memblock_get_length(u->memblock), frequency);
156 pa_memblock_release(u->memblock);
158 pa_snprintf(t, sizeof(t), "Sine Generator at %u Hz", frequency);
160 pa_sink_input_new_data_init(&data);
162 data.driver = __FILE__;
164 pa_sink_input_new_data_set_sample_spec(&data, &ss);
167 if (!(u->sink_input = pa_sink_input_new(m->core, &data, 0)))
170 u->sink_input->peek = sink_input_peek_cb;
171 u->sink_input->drop = sink_input_drop_cb;
172 u->sink_input->kill = sink_input_kill_cb;
173 u->sink_input->userdata = u;
175 pa_sink_input_put(u->sink_input);
188 void pa__done(pa_module*m) {
193 if (!(u = m->userdata))
197 pa_sink_input_unlink(u->sink_input);
198 pa_sink_input_unref(u->sink_input);
202 pa_memblock_unref(u->memblock);