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/*
* Asterisk -- A telephony toolkit for Linux.
*
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
* Wait for Silence
* - Waits for up to 'x' milliseconds of silence, 'y' times
* - WaitForSilence(500,2) will wait for 1/2 second of silence, twice
* - WaitForSilence(1000,1) will wait for 1 second of silence, once
*
* WaitForSilence Application by David C. Troy <dave@popvox.com>
* Version 1.00 2004-01-29
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <asterisk/file.h>
#include <asterisk/logger.h>
#include <asterisk/channel.h>
#include <asterisk/pbx.h>
#include <asterisk/dsp.h>
#include <asterisk/module.h>
#include <asterisk/options.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <pthread.h>
static char *tdesc = "Wait For Silence";
static char *app = "WaitForSilence";
static char *synopsis = "Waits for a specified amount of silence";
static char *descrip =
" WaitForSilence(x[|y]) Wait for Silence: Waits for up to 'x' \n"
"milliseconds of silence, 'y' times or 1 if omitted\n"
"Examples:\n"
" - WaitForSilence(500,2) will wait for 1/2 second of silence, twice\n"
" - WaitForSilence(1000) will wait for 1 second of silence, once\n";
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
static int do_waiting(struct ast_channel *chan, int maxsilence) {
struct ast_frame *f;
int totalsilence = 0;
int dspsilence = 0;
int gotsilence = 0;
static int silencethreshold = 64;
int rfmt = 0;
int res = 0;
struct ast_dsp *sildet; /* silence detector dsp */
rfmt = chan->readformat; /* Set to linear mode */
res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
if (res < 0) {
ast_log(LOG_WARNING, "Unable to set to linear mode, giving up\n");
return -1;
}
sildet = ast_dsp_new(); /* Create the silence detector */
if (!sildet) {
ast_log(LOG_WARNING, "Unable to create silence detector :(\n");
return -1;
}
ast_dsp_set_threshold(sildet, silencethreshold);
/* Await silence... */
f = NULL;
for(;;) {
res = ast_waitfor(chan, 2000);
if (!res) {
ast_log(LOG_WARNING, "One waitfor failed, trying another\n");
/* Try one more time in case of masq */
res = ast_waitfor(chan, 2000);
if (!res) {
ast_log(LOG_WARNING, "No audio available on %s??\n", chan->name);
res = -1;
}
}
if (res < 0) {
f = NULL;
break;
}
f = ast_read(chan);
if (!f)
break;
if (f->frametype == AST_FRAME_VOICE) {
dspsilence = 0;
ast_dsp_silence(sildet, f, &dspsilence);
if (dspsilence)
totalsilence = dspsilence;
else
totalsilence = 0;
if (totalsilence >= maxsilence) {
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Exiting with %dms silence > %dms required\n", totalsilence, maxsilence);
/* Ended happily with silence */
ast_frfree(f);
gotsilence = 1;
break;
}
}
ast_frfree(f);
}
if (rfmt && ast_set_read_format(chan, rfmt)) {
ast_log(LOG_WARNING, "Unable to restore format %s to channel '%s'\n", ast_getformatname(rfmt), chan->name);
}
ast_dsp_free(sildet);
return gotsilence;
}
static int waitforsilence_exec(struct ast_channel *chan, void *data)
{
int res = 1;
struct localuser *u;
int maxsilence = 1000;
int iterations = 1, i;
res = ast_answer(chan); /* Answer the channel */
if (!data || ((sscanf(data, "%d|%d", &maxsilence, &iterations) != 2) &&
(sscanf(data, "%d", &maxsilence) != 1))) {
ast_log(LOG_WARNING, "Using default value of 1000ms, 1 iteration\n");
}
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Waiting %d time(s) for %d ms silence\n", iterations, maxsilence);
LOCAL_USER_ADD(u);
res = 1;
for (i=0; (i<iterations) && (res == 1); i++) {
res = do_waiting(chan, maxsilence);
}
LOCAL_USER_REMOVE(u);
if (res > 0)
res = 0;
return res;
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
return ast_unregister_application(app);
}
int load_module(void)
{
return ast_register_application(app, waitforsilence_exec, synopsis, descrip);
}
char *description(void)
{
return tdesc;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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