2 This file is part of PulseAudio.
4 Copyright 2004-2006 Lennart Poettering
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
29 #include <pulse/xmalloc.h>
31 #include <pulsecore/sink-input.h>
32 #include <pulsecore/module.h>
33 #include <pulsecore/modargs.h>
34 #include <pulsecore/namereg.h>
35 #include <pulsecore/log.h>
36 #include <pulsecore/core-util.h>
38 #include "module-sine-symdef.h"
40 PA_MODULE_AUTHOR("Lennart Poettering");
41 PA_MODULE_DESCRIPTION("Sine wave generator");
42 PA_MODULE_VERSION(PACKAGE_VERSION);
43 PA_MODULE_LOAD_ONCE(FALSE);
44 PA_MODULE_USAGE("sink=<sink to connect to> frequency=<frequency in Hz>");
49 pa_sink_input *sink_input;
50 pa_memblock *memblock;
54 static const char* const valid_modargs[] = {
60 static int sink_input_pop_cb(pa_sink_input *i, size_t nbytes, pa_memchunk *chunk) {
63 pa_sink_input_assert_ref(i);
64 pa_assert_se(u = i->userdata);
67 chunk->memblock = pa_memblock_ref(u->memblock);
68 chunk->length = pa_memblock_get_length(u->memblock) - u->peek_index;
69 chunk->index = u->peek_index;
76 static void sink_input_process_rewind_cb(pa_sink_input *i, size_t nbytes) {
80 pa_sink_input_assert_ref(i);
81 pa_assert_se(u = i->userdata);
83 l = pa_memblock_get_length(u->memblock);
86 if (u->peek_index >= nbytes)
87 u->peek_index -= nbytes;
89 u->peek_index = l + u->peek_index - nbytes;
92 static void sink_input_kill_cb(pa_sink_input *i) {
95 pa_sink_input_assert_ref(i);
96 pa_assert_se(u = i->userdata);
98 pa_sink_input_unlink(u->sink_input);
99 pa_sink_input_unref(u->sink_input);
100 u->sink_input = NULL;
102 pa_module_unload_request(u->module, TRUE);
105 /* Called from IO thread context */
106 static void sink_input_state_change_cb(pa_sink_input *i, pa_sink_input_state_t state) {
109 pa_sink_input_assert_ref(i);
110 pa_assert_se(u = i->userdata);
112 /* If we are added for the first time, ask for a rewinding so that
113 * we are heard right-away. */
114 if (PA_SINK_INPUT_IS_LINKED(state) &&
115 i->thread_info.state == PA_SINK_INPUT_INIT)
116 pa_sink_input_request_rewind(i, 0, FALSE, TRUE);
119 static void calc_sine(float *f, size_t l, double freq) {
124 for (i = 0; i < l; i++)
125 f[i] = (float) sin((double) i/(double)l*M_PI*2*freq)/2;
128 int pa__init(pa_module*m) {
129 pa_modargs *ma = NULL;
135 pa_sink_input_new_data data;
137 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
138 pa_log("Failed to parse module arguments");
142 m->userdata = u = pa_xnew0(struct userdata, 1);
145 u->sink_input = NULL;
149 if (!(sink = pa_namereg_get(m->core, pa_modargs_get_value(ma, "sink", NULL), PA_NAMEREG_SINK, 1))) {
150 pa_log("No such sink.");
154 ss.format = PA_SAMPLE_FLOAT32;
155 ss.rate = sink->sample_spec.rate;
159 if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
160 pa_log("Invalid frequency specification");
164 u->memblock = pa_memblock_new(m->core->mempool, pa_bytes_per_second(&ss));
165 p = pa_memblock_acquire(u->memblock);
166 calc_sine(p, pa_memblock_get_length(u->memblock), (double) frequency);
167 pa_memblock_release(u->memblock);
169 pa_sink_input_new_data_init(&data);
171 data.driver = __FILE__;
172 pa_proplist_setf(data.proplist, PA_PROP_MEDIA_NAME, "%u Hz Sine", frequency);
173 pa_proplist_sets(data.proplist, PA_PROP_MEDIA_ROLE, "abstract");
174 pa_proplist_setf(data.proplist, "sine.hz", "%u", frequency);
175 pa_sink_input_new_data_set_sample_spec(&data, &ss);
178 u->sink_input = pa_sink_input_new(m->core, &data, 0);
179 pa_sink_input_new_data_done(&data);
184 u->sink_input->pop = sink_input_pop_cb;
185 u->sink_input->process_rewind = sink_input_process_rewind_cb;
186 u->sink_input->kill = sink_input_kill_cb;
187 u->sink_input->state_change = sink_input_state_change_cb;
188 u->sink_input->userdata = u;
190 pa_sink_input_put(u->sink_input);
203 void pa__done(pa_module*m) {
208 if (!(u = m->userdata))
212 pa_sink_input_unlink(u->sink_input);
213 pa_sink_input_unref(u->sink_input);
217 pa_memblock_unref(u->memblock);