app_senddtmf.c

Go to the documentation of this file.

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief App to send DTMF digits
 *
 * \author Mark Spencer <[email protected]>
 *
 * \ingroup applications
 */

/*** MODULEINFO
 <support_level>core</support_level>
 ***/

#include "asterisk.h"

#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/manager.h"
#include "asterisk/channel.h"

/*** DOCUMENTATION
 <application name="SendDTMF" language="en_US">
 <synopsis>
 Sends arbitrary DTMF digits
 </synopsis>
 <syntax>
 <parameter name="digits" required="true">
 <para>List of digits 0-9,*#,a-d,A-D to send also w for a half second pause,
 W for a one second pause, and f or F for a flash-hook if the channel supports
 flash-hook.</para>
 </parameter>
 <parameter name="timeout_ms" required="false">
 <para>Amount of time to wait in ms between tones. (defaults to .25s)</para>
 </parameter>
 <parameter name="duration_ms" required="false">
 <para>Duration of each digit</para>
 </parameter>
 <parameter name="channel" required="false">
 <para>Channel where digits will be played</para>
 </parameter>
 </syntax>
 <description>
 <para>It will send all digits or terminate if it encounters an error.</para>
 </description>
 <see-also>
 <ref type="application">Read</ref>
 </see-also>
 </application>
 <manager name="PlayDTMF" language="en_US">
 <synopsis>
 Play DTMF signal on a specific channel.
 </synopsis>
 <syntax>
 <xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
 <parameter name="Channel" required="true">
 <para>Channel name to send digit to.</para>
 </parameter>
 <parameter name="Digit" required="true">
 <para>The DTMF digit to play.</para>
 </parameter>
 <parameter name="Duration" required="false">
 <para>The duration, in milliseconds, of the digit to be played.</para>
 </parameter>
 <parameter name="Receive" required="false">
 <para>Emulate receiving DTMF on this channel instead of sending it out.</para>
 </parameter>
 </syntax>
 <description>
 <para>Plays a dtmf digit on the specified channel.</para>
 </description>
 </manager>
 ***/

static const char senddtmf_name[] = "SendDTMF";

static int senddtmf_exec(struct ast_channel *chan, const char *vdata)
{
 int res;
 char *data;
 int dinterval = 0, duration = 0;
 struct ast_channel *chan_found = NULL;
 struct ast_channel *chan_dest = chan;
 struct ast_channel *chan_autoservice = NULL;
 AST_DECLARE_APP_ARGS(args,
 AST_APP_ARG(digits);
 AST_APP_ARG(dinterval);
 AST_APP_ARG(duration);
 AST_APP_ARG(channel);
 );

 if (ast_strlen_zero(vdata)) {
 ast_log(LOG_WARNING, "SendDTMF requires an argument\n");
 return 0;
 }

 data = ast_strdupa(vdata);
 AST_STANDARD_APP_ARGS(args, data);

 if (ast_strlen_zero(args.digits)) {
 ast_log(LOG_WARNING, "The digits argument is required (0-9,*#,a-d,A-D,wfF)\n");
 return 0;
 }
 if (!ast_strlen_zero(args.dinterval)) {
 ast_app_parse_timelen(args.dinterval, &dinterval, TIMELEN_MILLISECONDS);
 }
 if (!ast_strlen_zero(args.duration)) {
 ast_app_parse_timelen(args.duration, &duration, TIMELEN_MILLISECONDS);
 }
 if (!ast_strlen_zero(args.channel)) {
 chan_found = ast_channel_get_by_name(args.channel);
 if (!chan_found) {
 ast_log(LOG_WARNING, "No such channel: %s\n", args.channel);
 return 0;
 }
 chan_dest = chan_found;
 if (chan_found != chan) {
 chan_autoservice = chan;
 }
 }
 res = ast_dtmf_stream(chan_dest, chan_autoservice, args.digits,
 dinterval <= 0 ? 250 : dinterval, duration);
 if (chan_found) {
 ast_channel_unref(chan_found);
 }

 return chan_autoservice ? 0 : res;
}

static int manager_play_dtmf(struct mansession *s, const struct message *m)
{
 const char *channel = astman_get_header(m, "Channel");
 const char *digit = astman_get_header(m, "Digit");
 const char *duration = astman_get_header(m, "Duration");
 const char *receive_s = astman_get_header(m, "Receive");
 struct ast_channel *chan;
 unsigned int duration_ms = 0;

 if (!(chan = ast_channel_get_by_name(channel))) {
 astman_send_error(s, m, "Channel not found");
 return 0;
 }

 if (ast_strlen_zero(digit)) {
 astman_send_error(s, m, "No digit specified");
 chan = ast_channel_unref(chan);
 return 0;
 }

 if (!ast_strlen_zero(duration) && (sscanf(duration, "%30u", &duration_ms) != 1)) {
 astman_send_error(s, m, "Could not convert Duration parameter");
 chan = ast_channel_unref(chan);
 return 0;
 }

 if (ast_true(receive_s)) {
 struct ast_frame f = { AST_FRAME_DTMF, };
 f.len = duration_ms;
 f.subclass.integer = *digit;
 ast_queue_frame(chan, &f);
 } else {
 ast_senddigit_external(chan, *digit, duration_ms);
 }

 chan = ast_channel_unref(chan);

 astman_send_ack(s, m, "DTMF successfully queued");

 return 0;
}

static int unload_module(void)
{
 int res;

 res = ast_unregister_application(senddtmf_name);
 res |= ast_manager_unregister("PlayDTMF");

 return res;
}

static int load_module(void)
{
 int res;

 res = ast_manager_register_xml("PlayDTMF", EVENT_FLAG_CALL, manager_play_dtmf);
 res |= ast_register_application_xml(senddtmf_name, senddtmf_exec);

 return res;
}

AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Send DTMF digits Application");