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Changes/fixes to the app_waitforsilence app to make it behave more the way the author originally intended for it

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to function along with an option to keep backward compatible with "old-style" functionality in 1.2. 
 (#6595 - davetroy reported and patched w/some very minor mods/corrections)



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@41915 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
BJ Weschke
2006-09-03 20:23:41 +00:00
parent c5c1d4579f
commit 7057035ae0
2 changed files with 85 additions and 66 deletions
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145
apps/app_waitforsilence.c
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@@ -4,7 +4,7 @@
* Copyright (C) 1999 - 2005, Digium, Inc.
*
* WaitForSilence Application by David C. Troy <dave@popvox.com>
* Version 1.00 2004-01-29
* Version 1.11 2006-06-29
*
* Mark Spencer <markster@digium.com>
*
@@ -25,6 +25,7 @@
* - Waits for up to 'x' milliseconds of silence, 'y' times \n
* - WaitForSilence(500,2) will wait for 1/2 second of silence, twice \n
* - WaitForSilence(1000,1) will wait for 1 second of silence, once \n
* - WaitForSilence(300,3,10) will wait for 300ms of silence, 3 times, and return after 10sec \n
*
* \author David C. Troy <dave@popvox.com>
*
@@ -50,34 +51,43 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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"
"Set the channel variable WAITSTATUS with to one of these values:"
"SILENCE - if silence of x ms was detected"
"TIMEOUT - if silence of x ms was not detected."
"Examples:\n"
static char *descrip =
" WaitForSilence(silencerequired[|iterations][|timeout]) \n"
"Wait for Silence: Waits for up to 'silencerequired' \n"
"milliseconds of silence, 'iterations' times or once if omitted.\n"
"An optional timeout specified the number of seconds to return\n"
"after, even if we do not receive the specified amount of silence.\n"
"Use 'timeout' with caution, as it may defeat the purpose of this\n"
"application, which is to wait indefinitely until silence is detected\n"
"on the line. This is particularly useful for reverse-911-type\n"
"call broadcast applications where you need to wait for an answering\n"
"machine to complete its spiel before playing a message.\n"
"The timeout parameter is specified only to avoid an infinite loop in\n"
"cases where silence is never achieved. Typically you will want to\n"
"include two or more calls to WaitForSilence when dealing with an answering\n"
"machine; first waiting for the spiel to finish, then waiting for the beep, etc.\n\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";
static int do_waiting(struct ast_channel *chan, int maxsilence) {
" - WaitForSilence(1000) will wait for 1 second of silence, once\n"
" - WaitForSilence(300|3|10) will wait for 300ms silence, 3 times,\n"
" and returns after 10 sec, even if silence is not detected\n\n"
"Sets the channel variable WAITSTATUS with to one of these values:\n"
"SILENCE - if exited with silence detected\n"
"TIMEOUT - if exited without silence detected after timeout\n";
static int do_waiting(struct ast_channel *chan, int silencereqd, time_t waitstart, int timeout) {
struct ast_frame *f;
int totalsilence = 0;
int dspsilence = 0;
int gotsilence = 0;
static int silencethreshold = 128;
int rfmt = 0;
int res = 0;
struct ast_dsp *sildet; /* silence detector dsp */
time_t start, now;
time(&start);
time_t now;
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");
ast_log(LOG_WARNING, "Unable to set channel to linear mode, giving up\n");
return -1;
}
@@ -91,88 +101,90 @@ static int do_waiting(struct ast_channel *chan, int maxsilence) {
/* 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;
}
}
/* Start with no silence received */
dspsilence = 0;
if (res < 0) {
res = ast_waitfor(chan, silencereqd);
/* Must have gotten a hangup; let's exit */
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;
time(&start);
} 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 */
gotsilence = 1;
pbx_builtin_setvar_helper(chan, "WAITSTATUS", "SILENCE");
ast_log(LOG_DEBUG, "WAITSTATUS was set to SILENCE\n");
ast_frfree(f);
/* We waited and got no frame; sounds like digital silence or a muted digital channel */
if (!res) {
dspsilence = silencereqd;
} else {
/* Looks like we did get a frame, so let's check it out */
f = ast_read(chan);
if (!f)
break;
} else if ( difftime(time(&now),start) >= maxsilence/1000 ) {
pbx_builtin_setvar_helper(chan, "WAITSTATUS", "TIMEOUT");
ast_log(LOG_DEBUG, "WAITSTATUS was set to TIMEOUT\n");
if (f && f->frametype == AST_FRAME_VOICE) {
ast_dsp_silence(sildet, f, &dspsilence);
ast_frfree(f);
break;
}
}
ast_frfree(f);
if (option_verbose > 6)
ast_verbose(VERBOSE_PREFIX_3 "Got %dms silence< %dms required\n", dspsilence, silencereqd);
if (dspsilence >= silencereqd) {
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Exiting with %dms silence >= %dms required\n", dspsilence, silencereqd);
/* Ended happily with silence */
res = 1;
pbx_builtin_setvar_helper(chan, "WAITSTATUS", "SILENCE");
ast_log(LOG_DEBUG, "WAITSTATUS was set to SILENCE\n");
break;
}
if ( timeout && (difftime(time(&now),waitstart) >= timeout) ) {
pbx_builtin_setvar_helper(chan, "WAITSTATUS", "TIMEOUT");
ast_log(LOG_DEBUG, "WAITSTATUS was set to TIMEOUT\n");
res = 0;
break;
}
}
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;
return res;
}
static int waitforsilence_exec(struct ast_channel *chan, void *data)
{
int res = 1;
struct ast_module_user *u;
int maxsilence = 1000;
int silencereqd = 1000;
int timeout = 0;
int iterations = 1, i;
time_t waitstart;
u = ast_module_user_add(chan);
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 (!data || ( (sscanf(data, "%d|%d|%d", &silencereqd, &iterations, &timeout) != 3) &&
(sscanf(data, "%d|%d", &silencereqd, &iterations) != 2) &&
(sscanf(data, "%d", &silencereqd) != 1) ) ) {
ast_log(LOG_WARNING, "Using default value of 1000ms, 1 iteration, no timeout\n");
}
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Waiting %d time(s) for %d ms silence\n", iterations, maxsilence);
ast_verbose(VERBOSE_PREFIX_3 "Waiting %d time(s) for %d ms silence with %d timeout\n", iterations, silencereqd, timeout);
time(&waitstart);
res = 1;
for (i=0; (i<iterations) && (res == 1); i++) {
res = do_waiting(chan, maxsilence);
res = do_waiting(chan, silencereqd, waitstart, timeout);
}
ast_module_user_remove(u);
if (res > 0)
res = 0;
return res;
}
static int unload_module(void)
{
int res;
@@ -190,3 +202,4 @@ static int load_module(void)
}
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Wait For Silence");