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Add WaitForSilence application (bug #2467)
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4329 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Mark Spencer
168
apps/app_waitforsilence.c
Executable file
168
apps/app_waitforsilence.c
Executable file
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/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Copyright (C) 1999-2004, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* Wait for Silence
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* - Waits for up to 'x' milliseconds of silence, 'y' times
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* - WaitForSilence(500,2) will wait for 1/2 second of silence, twice
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* - WaitForSilence(1000,1) will wait for 1 second of silence, once
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*
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* WaitForSilence Application by David C. Troy <dave@popvox.com>
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* Version 1.00 2004-01-29
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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
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*/
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#include <asterisk/file.h>
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#include <asterisk/logger.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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#include <asterisk/options.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <pthread.h>
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static char *tdesc = "Wait For Silence";
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static char *app = "WaitForSilence";
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static char *synopsis = "Waits for a specified amount of silence";
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static char *descrip =
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" WaitForSilence(x[|y]) Wait for Silence: Waits for up to 'x' \n"
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"milliseconds of silence, 'y' times or 1 if omitted\n"
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"Examples:\n"
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" - WaitForSilence(500,2) will wait for 1/2 second of silence, twice\n"
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" - WaitForSilence(1000) will wait for 1 second of silence, once\n";
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STANDARD_LOCAL_USER;
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LOCAL_USER_DECL;
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static int do_waiting(struct ast_channel *chan, int duration) {
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struct ast_frame *f;
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int totalsilence = 0;
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int dspsilence = 0;
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int gotsilence = 0;
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static int silencethreshold = 64;
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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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rfmt = chan->readformat; /* Set to linear mode */
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res = ast_set_read_format(chan, AST_FORMAT_SLINEAR);
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if (res < 0) {
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ast_log(LOG_WARNING, "Unable to set to linear mode, giving up\n");
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return -1;
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}
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sildet = ast_dsp_new(); /* Create the silence detector */
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if (!sildet) {
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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, silencethreshold);
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/* Await silence... */
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f = NULL;
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for(;;) {
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res = ast_waitfor(chan, 2000);
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if (!res) {
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ast_log(LOG_WARNING, "One waitfor failed, trying another\n");
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/* Try one more time in case of masq */
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res = ast_waitfor(chan, 2000);
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if (!res) {
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ast_log(LOG_WARNING, "No audio available on %s??\n", chan->name);
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res = -1;
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}
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}
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if (res < 0) {
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f = NULL;
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break;
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}
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f = ast_read(chan);
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if (!f)
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break;
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if (f->frametype == AST_FRAME_VOICE) {
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dspsilence = 0;
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ast_dsp_silence(sildet, f, &dspsilence);
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if (dspsilence)
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totalsilence = dspsilence;
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else
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totalsilence = 0;
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/* ast_verbose(VERBOSE_PREFIX_3 "dspsilence: %d, totalsilence: %d\n", dspsilence, totalsilence); */
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if (totalsilence >= duration) {
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ast_verbose(VERBOSE_PREFIX_3 "exiting with %d silence > %d required\n", totalsilence, duration);
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/* Ended happily with silence */
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ast_frfree(f);
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gotsilence = 1;
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break;
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}
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}
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ast_frfree(f);
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}
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ast_dsp_free(sildet);
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return gotsilence;
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}
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static int waitforsilence_exec(struct ast_channel *chan, void *data)
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{
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int res=1;
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struct localuser *u;
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int duration = 1000;
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int iterations = 1, i;
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res = ast_answer(chan); /* Answer the channel */
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if (!data || ((sscanf(data, "%d|%d", &duration, &iterations) != 2) &&
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(sscanf(data, "%d", &duration != 1)))) {
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ast_log(LOG_WARNING, "Using default value of 1000ms, 1 iteration\n");
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}
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ast_verbose(VERBOSE_PREFIX_3 "Waiting %d time(s) for %d ms silence\n", iterations, duration);
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LOCAL_USER_ADD(u);
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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, duration);
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}
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LOCAL_USER_REMOVE(u);
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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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int unload_module(void)
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{
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STANDARD_HANGUP_LOCALUSERS;
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return ast_unregister_application(app);
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}
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int load_module(void)
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{
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return ast_register_application(app, waitforsilence_exec, synopsis, descrip);
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}
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char *description(void)
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{
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return tdesc;
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}
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int usecount(void)
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{
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int res;
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STANDARD_USECOUNT(res);
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return res;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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