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code.delx.au - pulseaudio/blob - src/modules/module-sine.c
4 This file is part of PulseAudio.
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
30 #include <pulse/xmalloc.h>
32 #include <pulsecore/sink-input.h>
33 #include <pulsecore/module.h>
34 #include <pulsecore/modargs.h>
35 #include <pulsecore/namereg.h>
36 #include <pulsecore/log.h>
38 #include "module-sine-symdef.h"
40 PA_MODULE_AUTHOR("Lennart Poettering")
41 PA_MODULE_DESCRIPTION("Sine wave generator")
42 PA_MODULE_USAGE("sink=<sink to connect to> frequency=<frequency in Hz>")
43 PA_MODULE_VERSION(PACKAGE_VERSION
)
48 pa_sink_input
*sink_input
;
49 pa_memblock
*memblock
;
53 static const char* const valid_modargs
[] = {
59 static int sink_input_peek(pa_sink_input
*i
, pa_memchunk
*chunk
) {
61 assert(i
&& chunk
&& i
->userdata
);
64 chunk
->memblock
= pa_memblock_ref(u
->memblock
);
65 chunk
->index
= u
->peek_index
;
66 chunk
->length
= u
->memblock
->length
- u
->peek_index
;
70 static void sink_input_drop(pa_sink_input
*i
, const pa_memchunk
*chunk
, size_t length
) {
72 assert(i
&& chunk
&& length
&& i
->userdata
);
75 assert(chunk
->memblock
== u
->memblock
&& length
<= u
->memblock
->length
-u
->peek_index
);
77 u
->peek_index
+= length
;
79 if (u
->peek_index
>= u
->memblock
->length
)
83 static void sink_input_kill(pa_sink_input
*i
) {
85 assert(i
&& i
->userdata
);
88 pa_sink_input_disconnect(u
->sink_input
);
89 pa_sink_input_unref(u
->sink_input
);
92 pa_module_unload_request(u
->module
);
95 static void calc_sine(float *f
, size_t l
, float freq
) {
100 for (i
= 0; i
< l
; i
++)
101 f
[i
] = (float) sin((double) i
/l
*M_PI
*2*freq
)/2;
104 int pa__init(pa_core
*c
, pa_module
*m
) {
105 pa_modargs
*ma
= NULL
;
108 const char *sink_name
;
113 if (!(ma
= pa_modargs_new(m
->argument
, valid_modargs
))) {
114 pa_log(__FILE__
": Failed to parse module arguments");
118 m
->userdata
= u
= pa_xmalloc(sizeof(struct userdata
));
121 u
->sink_input
= NULL
;
124 sink_name
= pa_modargs_get_value(ma
, "sink", NULL
);
126 if (!(sink
= pa_namereg_get(c
, sink_name
, PA_NAMEREG_SINK
, 1))) {
127 pa_log(__FILE__
": No such sink.");
131 ss
.format
= PA_SAMPLE_FLOAT32
;
132 ss
.rate
= sink
->sample_spec
.rate
;
136 if (pa_modargs_get_value_u32(ma
, "frequency", &frequency
) < 0 || frequency
< 1 || frequency
> ss
.rate
/2) {
137 pa_log(__FILE__
": Invalid frequency specification");
141 u
->memblock
= pa_memblock_new(pa_bytes_per_second(&ss
), c
->memblock_stat
);
142 calc_sine(u
->memblock
->data
, u
->memblock
->length
, frequency
);
144 snprintf(t
, sizeof(t
), "Sine Generator at %u Hz", frequency
);
145 if (!(u
->sink_input
= pa_sink_input_new(sink
, __FILE__
, t
, &ss
, NULL
, NULL
, 0, -1)))
148 u
->sink_input
->peek
= sink_input_peek
;
149 u
->sink_input
->drop
= sink_input_drop
;
150 u
->sink_input
->kill
= sink_input_kill
;
151 u
->sink_input
->userdata
= u
;
152 u
->sink_input
->owner
= m
;
167 void pa__done(pa_core
*c
, pa_module
*m
) {
168 struct userdata
*u
= m
->userdata
;
175 pa_sink_input_disconnect(u
->sink_input
);
176 pa_sink_input_unref(u
->sink_input
);
180 pa_memblock_unref(u
->memblock
);