app_senddtmf.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2005, Digium, Inc.
 *
 * Mark Spencer <markster@digium.com>
 *
 * 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 <markster@digium.com>
 *
 * \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>
            <parameter name="options">
                <optionlist>
                    <option name="a">
                        <para>Answer the channel specified by the <literal>channel</literal>
                        parameter if it is not already up. If no <literal>channel</literal>
                        parameter is provided, the current channel will be answered.</para>
                    </option>
                </optionlist>
            </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>
    <manager name="SendFlash" language="en_US">
        <synopsis>
            Send a hook flash 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 hook flash to.</para>
            </parameter>
            <parameter name="Receive" required="false">
                <para>Emulate receiving a hook flash on this channel instead of sending it out.</para>
            </parameter>
        </syntax>
        <description>
            <para>Sends a hook flash on the specified channel.</para>
        </description>
    </manager>
 ***/
 
enum read_option_flags {
    OPT_ANSWER = (1 << 0),
};
 
AST_APP_OPTIONS(senddtmf_app_options, {
    AST_APP_OPTION('a', OPT_ANSWER),
});
 
enum {
    /* note: this entry _MUST_ be the last one in the enum */
    OPT_ARG_ARRAY_SIZE,
};
 
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;
    char *opt_args[OPT_ARG_ARRAY_SIZE];
    struct ast_flags flags = {0};
    AST_DECLARE_APP_ARGS(args,
        AST_APP_ARG(digits);
        AST_APP_ARG(dinterval);
        AST_APP_ARG(duration);
        AST_APP_ARG(channel);
        AST_APP_ARG(options);
    );
 
    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;
        }
    }
    if (!ast_strlen_zero(args.options)) {
        ast_app_parse_options(senddtmf_app_options, &flags, opt_args, args.options);
    }
    if (ast_test_flag(&flags, OPT_ANSWER)) {
        ast_auto_answer(chan_dest);
    }
    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 manager_send_flash(struct mansession *s, const struct message *m)
{
    const char *channel = astman_get_header(m, "Channel");
    const char *receive_s = astman_get_header(m, "Receive");
    struct ast_channel *chan;
 
    if (!(chan = ast_channel_get_by_name(channel))) {
        astman_send_error(s, m, "Channel not found");
        return 0;
    }
 
    if (ast_true(receive_s)) {
        struct ast_frame f = { AST_FRAME_CONTROL, };
        f.subclass.integer = AST_CONTROL_FLASH;
        ast_queue_frame(chan, &f);
    } else {
        struct ast_frame f = { AST_FRAME_CONTROL, };
        f.subclass.integer = AST_CONTROL_FLASH;
        ast_channel_lock(chan);
        ast_write(chan, &f);
        ast_channel_unlock(chan);
    }
 
    chan = ast_channel_unref(chan);
    astman_send_ack(s, m, "Flash successfully queued");
    return 0;
}
 
static int unload_module(void)
{
    int res;
 
    res = ast_unregister_application(senddtmf_name);
    res |= ast_manager_unregister("PlayDTMF");
    res |= ast_manager_unregister("SendFlash");
 
    return res;
}
 
static int load_module(void)
{
    int res;
 
    res = ast_manager_register_xml("PlayDTMF", EVENT_FLAG_CALL, manager_play_dtmf);
    res |= ast_manager_register_xml("SendFlash", EVENT_FLAG_CALL, manager_send_flash);
    res |= ast_register_application_xml(senddtmf_name, senddtmf_exec);
 
    return res;
}
 
AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Send DTMF digits Application");