app_mf: Add channel agnostic MF sender
Adds a SendMF application and PlayMF manager event to send arbitrary R1 MF tones on the current or specified channel. ASTERISK-29496 Change-Id: I5d89afdbccee3f86cc702ed96d882f3d351327a4
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Naveen Albert
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parent
847349853a
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60daa8f761
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/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2021, Naveen Albert
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*
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* Naveen Albert <asterisk@phreaknet.org>
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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 App to send MF digits
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*
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* \author Naveen Albert <asterisk@phreaknet.org>
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*
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* \ingroup applications
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*/
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/*** MODULEINFO
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<support_level>extended</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/pbx.h"
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#include "asterisk/module.h"
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#include "asterisk/app.h"
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#include "asterisk/channel.h"
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#include "asterisk/indications.h"
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/*** DOCUMENTATION
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<application name="SendMF" language="en_US">
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<synopsis>
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Sends arbitrary MF digits
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</synopsis>
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<syntax>
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<parameter name="digits" required="true">
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<para>List of digits 0-9,*#ABC to send; also f or F for a flash-hook
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if the channel supports flash-hook, and w or W for a wink if the channel
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supports wink.</para>
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<para>Key pulse and start digits are not included automatically.
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* is used for KP, # for ST, A for STP, B for ST2P, and C for ST3P.</para>
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</parameter>
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<parameter name="timeout_ms" required="false">
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<para>Amount of time to wait in ms between tones. (defaults to 50ms).</para>
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</parameter>
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<parameter name="duration_ms" required="false">
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<para>Duration of each numeric digit (defaults to 55ms).</para>
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</parameter>
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<parameter name="duration_ms_kp" required="false">
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<para>Duration of KP digits (defaults to 120ms).</para>
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</parameter>
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<parameter name="duration_ms_st" required="false">
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<para>Duration of ST, STP, ST2P, and ST3P digits (defaults to 65ms).</para>
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</parameter>
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<parameter name="channel" required="false">
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<para>Channel where digits will be played</para>
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</parameter>
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</syntax>
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<description>
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<para>It will send all digits or terminate if it encounters an error.</para>
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</description>
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<see-also>
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<ref type="application">SendDTMF</ref>
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</see-also>
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</application>
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<manager name="PlayMF" language="en_US">
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<synopsis>
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Play MF signal on a specific channel.
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</synopsis>
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<syntax>
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<xi:include xpointer="xpointer(/docs/manager[@name='Login']/syntax/parameter[@name='ActionID'])" />
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<parameter name="Channel" required="true">
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<para>Channel name to send digit to.</para>
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</parameter>
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<parameter name="Digit" required="true">
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<para>The MF digit to play.</para>
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</parameter>
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<parameter name="Duration" required="false">
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<para>The duration, in milliseconds, of the digit to be played.</para>
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</parameter>
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</syntax>
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<description>
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<para>Plays an MF digit on the specified channel.</para>
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</description>
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</manager>
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***/
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static const char sendmf_name[] = "SendMF";
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#define DEFAULT_EMULATE_MF_DURATION 35
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#define MF_BETWEEN_MS 50
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#define MF_DURATION 55
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#define MF_KP_DURATION 120
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#define MF_ST_DURATION 65
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static int senddigit_mf_begin(struct ast_channel *chan, char digit)
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{
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static const char * const mf_tones[] = {
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"1300+1500", /* 0 */
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"700+900", /* 1 */
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"700+1100", /* 2 */
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"900+1100", /* 3 */
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"700+1300", /* 4 */
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"900+1300", /* 5 */
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"1100+1300", /* 6 */
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"700+1500", /* 7 */
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"900+1500", /* 8 */
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"1100+1500", /* 9 */
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"1100+1700", /* * (KP) */
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"1500+1700", /* # (ST) */
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"900+1700", /* A (STP) */
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"1300+1700", /* B (ST2P) */
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"700+1700" /* C (ST3P) */
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};
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if (digit >= '0' && digit <='9') {
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ast_playtones_start(chan, 0, mf_tones[digit-'0'], 0);
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} else if (digit == '*') {
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ast_playtones_start(chan, 0, mf_tones[10], 0);
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} else if (digit == '#') {
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ast_playtones_start(chan, 0, mf_tones[11], 0);
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} else if (digit == 'A') {
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ast_playtones_start(chan, 0, mf_tones[12], 0);
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} else if (digit == 'B') {
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ast_playtones_start(chan, 0, mf_tones[13], 0);
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} else if (digit == 'C') {
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ast_playtones_start(chan, 0, mf_tones[14], 0);
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} else {
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/* not handled */
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ast_log(LOG_WARNING, "Unable to generate MF tone '%c' for '%s'\n", digit, ast_channel_name(chan));
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}
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return 0;
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}
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static int senddigit_mf_end(struct ast_channel *chan)
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{
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if (ast_channel_generator(chan)) {
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ast_playtones_stop(chan);
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return 0;
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}
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return -1;
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}
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static int mysleep(struct ast_channel *chan, int ms, int is_external)
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{
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return is_external ? usleep(ms * 1000) : ast_safe_sleep(chan, ms);
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}
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static int senddigit_mf(struct ast_channel *chan, char digit, unsigned int duration,
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unsigned int durationkp, unsigned int durationst, int is_external)
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{
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if (duration < DEFAULT_EMULATE_MF_DURATION) {
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duration = DEFAULT_EMULATE_MF_DURATION;
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}
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if (ast_channel_tech(chan)->send_digit_begin) {
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if (digit == '*') {
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duration = durationkp;
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} else if (digit == '#' || digit == 'A' || digit == 'B' || digit == 'C') {
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duration = durationst;
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}
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senddigit_mf_begin(chan, digit);
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mysleep(chan, duration, is_external);
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}
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return senddigit_mf_end(chan);
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}
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static int mf_stream(struct ast_channel *chan, const char *digits, int between, unsigned int duration,
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unsigned int durationkp, unsigned int durationst, int is_external)
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{
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const char *ptr;
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int res;
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struct ast_silence_generator *silgen = NULL;
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if (!between) {
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between = 100;
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}
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/* Need a quiet time before sending digits. */
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if (ast_opt_transmit_silence) {
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silgen = ast_channel_start_silence_generator(chan);
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}
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res = mysleep(chan, 100, is_external);
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if (res) {
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goto mf_stream_cleanup;
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}
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for (ptr = digits; *ptr; ptr++) {
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if (strchr("0123456789*#ABCwWfF", *ptr)) {
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if (*ptr == 'f' || *ptr == 'F') {
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/* ignore return values if not supported by channel */
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ast_indicate(chan, AST_CONTROL_FLASH);
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} else if (*ptr == 'w' || *ptr == 'W') {
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/* ignore return values if not supported by channel */
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ast_indicate(chan, AST_CONTROL_WINK);
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} else {
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/* Character represents valid MF */
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senddigit_mf(chan, *ptr, duration, durationkp, durationst, is_external);
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}
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/* pause between digits */
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/* The DSP code in Asterisk does not currently properly receive repeated tones
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if no audio is sent in the middle. Simply sending audio (even 0 Hz)
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works around this limitation and guarantees the correct behavior.
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*/
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ast_playtones_start(chan, 0, "0", 0);
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res = mysleep(chan, between, is_external);
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senddigit_mf_end(chan);
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if (res) {
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break;
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}
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} else {
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ast_log(LOG_WARNING, "Illegal MF character '%c' in string. (0-9*#ABCwWfF allowed)\n", *ptr);
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}
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}
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mf_stream_cleanup:
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if (silgen) {
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ast_channel_stop_silence_generator(chan, silgen);
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}
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return res;
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}
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static int sendmf_exec(struct ast_channel *chan, const char *vdata)
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{
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int res;
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char *data;
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int dinterval = 0, duration = 0, durationkp = 0, durationst = 0;
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struct ast_channel *chan_found = NULL;
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struct ast_channel *chan_dest = chan;
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struct ast_channel *chan_autoservice = NULL;
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AST_DECLARE_APP_ARGS(args,
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AST_APP_ARG(digits);
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AST_APP_ARG(dinterval);
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AST_APP_ARG(duration);
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AST_APP_ARG(durationkp);
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AST_APP_ARG(durationst);
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AST_APP_ARG(channel);
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);
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if (ast_strlen_zero(vdata)) {
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ast_log(LOG_WARNING, "SendMF requires an argument\n");
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return 0;
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}
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data = ast_strdupa(vdata);
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AST_STANDARD_APP_ARGS(args, data);
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if (ast_strlen_zero(args.digits)) {
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ast_log(LOG_WARNING, "The digits argument is required (0-9,*#ABC,wf)\n");
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return 0;
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}
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if (!ast_strlen_zero(args.dinterval)) {
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ast_app_parse_timelen(args.dinterval, &dinterval, TIMELEN_MILLISECONDS);
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}
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if (!ast_strlen_zero(args.duration)) {
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ast_app_parse_timelen(args.duration, &duration, TIMELEN_MILLISECONDS);
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}
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if (!ast_strlen_zero(args.durationkp)) {
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ast_app_parse_timelen(args.durationkp, &durationkp, TIMELEN_MILLISECONDS);
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}
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if (!ast_strlen_zero(args.durationst)) {
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ast_app_parse_timelen(args.durationst, &durationst, TIMELEN_MILLISECONDS);
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}
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if (!ast_strlen_zero(args.channel)) {
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chan_found = ast_channel_get_by_name(args.channel);
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if (!chan_found) {
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ast_log(LOG_WARNING, "No such channel: %s\n", args.channel);
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return 0;
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}
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chan_dest = chan_found;
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if (chan_found != chan) {
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chan_autoservice = chan;
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}
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}
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if (chan_autoservice && ast_autoservice_start(chan_autoservice)) {
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ast_channel_cleanup(chan_found);
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return -1;
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}
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res = mf_stream(chan_dest, args.digits, dinterval <= 0 ? MF_BETWEEN_MS : dinterval,
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duration <= 0 ? MF_DURATION : duration, durationkp <= 0 ? MF_KP_DURATION : durationkp,
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durationst <= 0 ? MF_ST_DURATION : durationst, 0);
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if (chan_autoservice && ast_autoservice_stop(chan_autoservice)) {
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res = -1;
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}
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ast_channel_cleanup(chan_found);
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return chan_autoservice ? 0 : res;
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}
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static int manager_play_mf(struct mansession *s, const struct message *m)
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{
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const char *channel = astman_get_header(m, "Channel");
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const char *digit = astman_get_header(m, "Digit");
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const char *duration = astman_get_header(m, "Duration");
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struct ast_channel *chan;
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unsigned int duration_ms = MF_DURATION;
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if (!(chan = ast_channel_get_by_name(channel))) {
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astman_send_error(s, m, "Channel not found");
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return 0;
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}
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if (ast_strlen_zero(digit)) {
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astman_send_error(s, m, "No digit specified");
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chan = ast_channel_unref(chan);
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return 0;
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}
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/* Override default duration with KP or ST-specific default durations */
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if (!strcmp(digit, "*"))
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duration_ms = MF_KP_DURATION;
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if (!strcmp(digit, "#") || !strcmp(digit, "A") || !strcmp(digit, "B") || !strcmp(digit, "C"))
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duration_ms = MF_ST_DURATION;
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if (!ast_strlen_zero(duration) && (sscanf(duration, "%30u", &duration_ms) != 1)) {
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astman_send_error(s, m, "Could not convert Duration parameter");
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chan = ast_channel_unref(chan);
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return 0;
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}
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senddigit_mf(chan, *digit, duration_ms, duration_ms, duration_ms, 1);
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chan = ast_channel_unref(chan);
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astman_send_ack(s, m, "MF successfully queued");
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return 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(sendmf_name);
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res |= ast_manager_unregister("PlayMF");
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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_manager_register_xml("PlayMF", EVENT_FLAG_CALL, manager_play_mf);
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res |= ast_register_application_xml(sendmf_name, sendmf_exec);
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return res;
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}
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AST_MODULE_INFO_STANDARD_EXTENDED(ASTERISK_GPL_KEY, "Send MF digits Application");
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@ -0,0 +1,6 @@
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Subject: Channel-agnostic MF support
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A SendMF application and PlayMF manager
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application are now included to send
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arbitrary standard R1 MF tones on the
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current channel or another specified channel.
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