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_VERSION(PACKAGE_VERSION);
45 PA_MODULE_LOAD_ONCE(FALSE);
46 PA_MODULE_USAGE("sink=<sink to connect to> frequency=<frequency in Hz>");
51 pa_sink_input *sink_input;
52 pa_memblock *memblock;
56 static const char* const valid_modargs[] = {
62 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
65 pa_sink_input_assert_ref(i);
66 pa_assert_se(u = i->userdata);
69 chunk->memblock = pa_memblock_ref(u->memblock);
70 chunk->length = pa_memblock_get_length(u->memblock) - u->peek_index;
71 chunk->index = u->peek_index;
78 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
82 pa_sink_input_assert_ref(i);
83 pa_assert_se(u = i->userdata);
85 l = pa_memblock_get_length(u->memblock);
88 if (u->peek_index >= nbytes)
89 u->peek_index -= nbytes;
91 u->peek_index = l + u->peek_index - nbytes;
94 static void sink_input_kill_cb(pa_sink_input *i) {
97 pa_sink_input_assert_ref(i);
98 pa_assert_se(u = i->userdata);
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 /* Called from IO thread context */
108 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
111 pa_sink_input_assert_ref(i);
112 pa_assert_se(u = i->userdata);
114 /* If we are added for the first time, ask for a rewinding so that
115 * we are heard right-away. */
116 if (PA_SINK_INPUT_IS_LINKED(state) &&
117 i->thread_info.state == PA_SINK_INPUT_INIT)
118 pa_sink_input_request_rewind(i, 0, FALSE, TRUE);
121 static void calc_sine(float *f, size_t l, float freq) {
126 for (i = 0; i < l; i++)
127 f[i] = (float) sin((double) i/l*M_PI*2*freq)/2;
130 int pa__init(pa_module*m) {
131 pa_modargs *ma = NULL;
137 pa_sink_input_new_data data;
139 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
140 pa_log("Failed to parse module arguments");
144 m->userdata = u = pa_xnew0(struct userdata, 1);
147 u->sink_input = NULL;
151 if (!(sink = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sink", NULL), PA_NAMEREG_SINK, 1))) {
152 pa_log("No such sink.");
156 ss.format = PA_SAMPLE_FLOAT32;
157 ss.rate = sink->sample_spec.rate;
161 if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
162 pa_log("Invalid frequency specification");
166 u->memblock = pa_memblock_new(m->core->mempool, pa_bytes_per_second(&ss));
167 p = pa_memblock_acquire(u->memblock);
168 calc_sine(p, pa_memblock_get_length(u->memblock), frequency);
169 pa_memblock_release(u->memblock);
171 pa_sink_input_new_data_init(&data);
173 data.driver = __FILE__;
174 pa_proplist_setf(data.proplist, PA_PROP_MEDIA_NAME, "%u Hz Sine", frequency);
175 pa_proplist_sets(data.proplist, PA_PROP_MEDIA_ROLE, "abstract");
176 pa_proplist_setf(data.proplist, "sine.hz", "%u", frequency);
177 pa_sink_input_new_data_set_sample_spec(&data, &ss);
180 u->sink_input = pa_sink_input_new(m->core, &data, 0);
181 pa_sink_input_new_data_done(&data);
186 u->sink_input->pop = sink_input_pop_cb;
187 u->sink_input->process_rewind = sink_input_process_rewind_cb;
188 u->sink_input->kill = sink_input_kill_cb;
189 u->sink_input->state_change = sink_input_state_change_cb;
190 u->sink_input->userdata = u;
192 pa_sink_input_put(u->sink_input);
205 void pa__done(pa_module*m) {
210 if (!(u = m->userdata))
214 pa_sink_input_unlink(u->sink_input);
215 pa_sink_input_unref(u->sink_input);
219 pa_memblock_unref(u->memblock);