e6b2e9a750
This patch adds 'const' tags to a number of Asterisk APIs where they are appropriate (where the API already demanded that the function argument not be modified, but the compiler was not informed of that fact). The list includes: - CLI command handlers - CLI command handler arguments - AGI command handlers - AGI command handler arguments - Dialplan application handler arguments - Speech engine API function arguments In addition, various file-scope and function-scope constant arrays got 'const' and/or 'static' qualifiers where they were missing. Review: https://reviewboard.asterisk.org/r/251/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196072 65c4cc65-6c06-0410-ace0-fbb531ad65f3
265 lines
8.6 KiB
C
265 lines
8.6 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* WaitForSilence Application by David C. Troy <dave@popvox.com>
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* Version 1.11 2006-06-29
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Wait for Silence
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* - Waits for up to 'x' milliseconds of silence, 'y' times \n
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* - WaitForSilence(500,2) will wait for 1/2 second of silence, twice \n
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* - WaitForSilence(1000,1) will wait for 1 second of silence, once \n
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* - WaitForSilence(300,3,10) will wait for 300ms of silence, 3 times, and return after 10sec \n
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*
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* \author David C. Troy <dave@popvox.com>
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*
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* \brief Wait For Noise
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* The same as Wait For Silence but listenes noise on the chennel that is above \n
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* the pre-configured silence threshold from dsp.conf
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*
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* \author Philipp Skadorov <skadorov@yahoo.com>
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*
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* \ingroup applications
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*/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include "asterisk/file.h"
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#include "asterisk/channel.h"
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#include "asterisk/pbx.h"
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#include "asterisk/dsp.h"
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#include "asterisk/module.h"
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/*** DOCUMENTATION
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<application name="WaitForSilence" language="en_US">
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<synopsis>
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Waits for a specified amount of silence.
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</synopsis>
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<syntax>
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<parameter name="silencerequired" required="true" />
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<parameter name="iterations">
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<para>If not specified, defaults to <literal>1</literal>.</para>
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</parameter>
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<parameter name="timeout">
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<para>Is specified only to avoid an infinite loop in cases where silence is never achieved.</para>
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</parameter>
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</syntax>
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<description>
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<para>Waits for up to <replaceable>silencerequired</replaceable> milliseconds of silence,
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<replaceable>iterations</replaceable> times. An optional <replaceable>timeout</replaceable>
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specified the number of seconds to return after, even if we do not receive the specified amount of silence.
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Use <replaceable>timeout</replaceable> with caution, as it may defeat the purpose of this application, which
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is to wait indefinitely until silence is detected on the line. This is particularly useful for reverse-911-type
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call broadcast applications where you need to wait for an answering machine to complete its spiel before
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playing a message.</para>
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<para>Typically you will want to include two or more calls to WaitForSilence when dealing with an answering
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machine; first waiting for the spiel to finish, then waiting for the beep, etc.</para>
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<para>Examples:</para>
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<para>WaitForSilence(500,2) will wait for 1/2 second of silence, twice</para>
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<para>WaitForSilence(1000) will wait for 1 second of silence, once</para>
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<para>WaitForSilence(300,3,10) will wait for 300ms silence, 3 times, and returns after 10 sec, even if silence
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is not detected</para>
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<para>Sets the channel variable <variable>WAITSTATUS</variable> to one of these values:</para>
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<variablelist>
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<variable name="WAITSTATUS">
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<value name="SILENCE">
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if exited with silence detected.
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</value>
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<value name="TIMEOUT">
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if exited without silence detected after timeout.
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</value>
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</variable>
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</variablelist>
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</description>
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<see-also>
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<ref type="application">WaitForNoise</ref>
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</see-also>
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</application>
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<application name="WaitForNoise" language="en_US">
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<synopsis>
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Waits for a specified amount of noise.
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</synopsis>
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<syntax>
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<parameter name="noiserequired" required="true" />
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<parameter name="iterations">
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<para>If not specified, defaults to <literal>1</literal>.</para>
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</parameter>
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<parameter name="timeout">
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<para>Is specified only to avoid an infinite loop in cases where silence is never achieved.</para>
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</parameter>
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</syntax>
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<description>
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<para>Waits for up to <replaceable>noiserequired</replaceable> milliseconds of noise,
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<replaceable>iterations</replaceable> times. An optional <replaceable>timeout</replaceable>
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specified the number of seconds to return after, even if we do not receive the specified amount of noise.
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Use <replaceable>timeout</replaceable> with caution, as it may defeat the purpose of this application, which
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is to wait indefinitely until noise is detected on the line.</para>
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</description>
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<see-also>
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<ref type="application">WaitForSilence</ref>
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</see-also>
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</application>
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***/
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static char *app_silence = "WaitForSilence";
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static char *app_noise = "WaitForNoise";
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static int do_waiting(struct ast_channel *chan, int timereqd, time_t waitstart, int timeout, int wait_for_silence) {
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struct ast_frame *f = NULL;
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int dsptime = 0;
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int rfmt = 0;
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int res = 0;
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struct ast_dsp *sildet; /* silence detector dsp */
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time_t now;
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/*Either silence or noise calc depending on wait_for_silence flag*/
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int (*ast_dsp_func)(struct ast_dsp*, struct ast_frame*, int*) =
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wait_for_silence ? ast_dsp_silence : ast_dsp_noise;
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rfmt = chan->readformat; /* Set to linear mode */
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if ((res = ast_set_read_format(chan, AST_FORMAT_SLINEAR)) < 0) {
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ast_log(LOG_WARNING, "Unable to set channel to linear mode, giving up\n");
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return -1;
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}
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/* Create the silence detector */
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if (!(sildet = ast_dsp_new())) {
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ast_log(LOG_WARNING, "Unable to create silence detector :(\n");
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return -1;
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}
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ast_dsp_set_threshold(sildet, ast_dsp_get_threshold_from_settings(THRESHOLD_SILENCE));
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/* Await silence... */
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for (;;) {
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/* Start with no silence received */
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dsptime = 0;
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res = ast_waitfor(chan, timereqd);
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/* Must have gotten a hangup; let's exit */
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if (res < 0) {
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pbx_builtin_setvar_helper(chan, "WAITSTATUS", "HANGUP");
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break;
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}
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/* We waited and got no frame; sounds like digital silence or a muted digital channel */
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if (res == 0) {
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dsptime = timereqd;
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} else {
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/* Looks like we did get a frame, so let's check it out */
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if (!(f = ast_read(chan))) {
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pbx_builtin_setvar_helper(chan, "WAITSTATUS", "HANGUP");
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break;
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}
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if (f->frametype == AST_FRAME_VOICE) {
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ast_dsp_func(sildet, f, &dsptime);
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}
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ast_frfree(f);
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}
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ast_verb(6, "Got %dms %s < %dms required\n", dsptime, wait_for_silence ? "silence" : "noise", timereqd);
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if (dsptime >= timereqd) {
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ast_verb(3, "Exiting with %dms %s >= %dms required\n", dsptime, wait_for_silence ? "silence" : "noise", timereqd);
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/* Ended happily with silence */
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res = 1;
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pbx_builtin_setvar_helper(chan, "WAITSTATUS", wait_for_silence ? "SILENCE" : "NOISE");
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ast_debug(1, "WAITSTATUS was set to %s\n", wait_for_silence ? "SILENCE" : "NOISE");
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break;
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}
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if (timeout && (difftime(time(&now), waitstart) >= timeout)) {
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pbx_builtin_setvar_helper(chan, "WAITSTATUS", "TIMEOUT");
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ast_debug(1, "WAITSTATUS was set to TIMEOUT\n");
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res = 0;
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break;
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}
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}
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if (rfmt && ast_set_read_format(chan, rfmt)) {
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ast_log(LOG_WARNING, "Unable to restore format %s to channel '%s'\n", ast_getformatname(rfmt), chan->name);
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}
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ast_dsp_free(sildet);
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return res;
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}
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static int waitfor_exec(struct ast_channel *chan, const char *data, int wait_for_silence)
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{
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int res = 1;
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int timereqd = 1000;
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int timeout = 0;
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int iterations = 1, i;
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time_t waitstart;
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if (chan->_state != AST_STATE_UP) {
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res = ast_answer(chan); /* Answer the channel */
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}
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if (!data || ( (sscanf(data, "%d,%d,%d", &timereqd, &iterations, &timeout) != 3) &&
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(sscanf(data, "%d,%d", &timereqd, &iterations) != 2) &&
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(sscanf(data, "%d", &timereqd) != 1) ) ) {
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ast_log(LOG_WARNING, "Using default value of 1000ms, 1 iteration, no timeout\n");
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}
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ast_verb(3, "Waiting %d time(s) for %d ms silence with %d timeout\n", iterations, timereqd, timeout);
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time(&waitstart);
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res = 1;
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for (i=0; (i<iterations) && (res == 1); i++) {
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res = do_waiting(chan, timereqd, waitstart, timeout, wait_for_silence);
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}
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if (res > 0)
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res = 0;
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return res;
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}
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static int waitforsilence_exec(struct ast_channel *chan, const char *data)
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{
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return waitfor_exec(chan, data, 1);
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}
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static int waitfornoise_exec(struct ast_channel *chan, const char *data)
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{
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return waitfor_exec(chan, data, 0);
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}
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static int unload_module(void)
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{
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int res;
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res = ast_unregister_application(app_silence);
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res |= ast_unregister_application(app_noise);
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return res;
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}
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static int load_module(void)
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{
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int res;
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res = ast_register_application_xml(app_silence, waitforsilence_exec);
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res |= ast_register_application_xml(app_noise, waitfornoise_exec);
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return res;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Wait For Silence");
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