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
32 #include <pulse/xmalloc.h>
34 #include <pulsecore/sink-input.h>
35 #include <pulsecore/module.h>
36 #include <pulsecore/modargs.h>
37 #include <pulsecore/namereg.h>
38 #include <pulsecore/log.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(pa_sink_input *i, pa_memchunk *chunk) {
63 assert(i && chunk && i->userdata);
66 chunk->memblock = pa_memblock_ref(u->memblock);
67 chunk->index = u->peek_index;
68 chunk->length = u->memblock->length - u->peek_index;
72 static void sink_input_drop(pa_sink_input *i, const pa_memchunk *chunk, size_t length) {
74 assert(i && chunk && length && i->userdata);
77 assert(chunk->memblock == u->memblock && length <= u->memblock->length-u->peek_index);
79 u->peek_index += length;
81 if (u->peek_index >= u->memblock->length)
85 static void sink_input_kill(pa_sink_input *i) {
87 assert(i && i->userdata);
90 pa_sink_input_disconnect(u->sink_input);
91 pa_sink_input_unref(u->sink_input);
94 pa_module_unload_request(u->module);
97 static void calc_sine(float *f, size_t l, float freq) {
102 for (i = 0; i < l; i++)
103 f[i] = (float) sin((double) i/l*M_PI*2*freq)/2;
106 int pa__init(pa_core *c, pa_module*m) {
107 pa_modargs *ma = NULL;
110 const char *sink_name;
114 pa_sink_input_new_data data;
116 if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
117 pa_log("Failed to parse module arguments");
121 m->userdata = u = pa_xmalloc(sizeof(struct userdata));
124 u->sink_input = NULL;
127 sink_name = pa_modargs_get_value(ma, "sink", NULL);
129 if (!(sink = pa_namereg_get(c, sink_name, PA_NAMEREG_SINK, 1))) {
130 pa_log("No such sink.");
134 ss.format = PA_SAMPLE_FLOAT32;
135 ss.rate = sink->sample_spec.rate;
139 if (pa_modargs_get_value_u32(ma, "frequency", &frequency) < 0 || frequency < 1 || frequency > ss.rate/2) {
140 pa_log("Invalid frequency specification");
144 u->memblock = pa_memblock_new(c->mempool, pa_bytes_per_second(&ss));
145 calc_sine(u->memblock->data, u->memblock->length, frequency);
147 snprintf(t, sizeof(t), "Sine Generator at %u Hz", frequency);
149 pa_sink_input_new_data_init(&data);
151 data.driver = __FILE__;
153 pa_sink_input_new_data_set_sample_spec(&data, &ss);
156 if (!(u->sink_input = pa_sink_input_new(c, &data, 0)))
159 u->sink_input->peek = sink_input_peek;
160 u->sink_input->drop = sink_input_drop;
161 u->sink_input->kill = sink_input_kill;
162 u->sink_input->userdata = u;
177 void pa__done(pa_core *c, pa_module*m) {
178 struct userdata *u = m->userdata;
185 pa_sink_input_disconnect(u->sink_input);
186 pa_sink_input_unref(u->sink_input);
190 pa_memblock_unref(u->memblock);