updated directory using asr/tts
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Brian West
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#JSGF V1.0;
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/**
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* JSGF Grammar for Directory
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*/
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grammar directory;
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<anthony> = [ anthony ];
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<michael> = [ michael ];
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<brian> = [ brian ];
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public <directory> = <anthony> <michael> <brian>;
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@ -0,0 +1,182 @@
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--[[
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FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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Copyright (C) 2005/2006, Anthony Minessale II <anthm@freeswitch.org>
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Version: MPL 1.1
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The contents of this file are subject to the Mozilla Public License Version
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1.1 (the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.mozilla.org/MPL/
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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for the specific language governing rights and limitations under the
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License.
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The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
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The Initial Developer of the Original Code is
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Anthony Minessale II <anthm@freeswitch.org>
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Portions created by the Initial Developer are Copyright (C)
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the Initial Developer. All Rights Reserved.
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Contributor(s):
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Brian West <brian@freeswitch.org>
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Example for Speech Enabled LUA Applications.
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]]
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-- Used in parse_xml
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function parseargs_xml(s)
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local arg = {}
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string.gsub(s, "(%w+)=([\"'])(.-)%2", function (w, _, a)
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arg[w] = a
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end)
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return arg
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end
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-- Turns XML into a lua table.
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function parse_xml(s)
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local stack = {};
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local top = {};
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table.insert(stack, top);
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local ni,c,label,xarg, empty;
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local i, j = 1, 1;
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while true do
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ni,j,c,label,xarg, empty = string.find(s, "<(%/?)(%w+)(.-)(%/?)>", i);
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if not ni then
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break
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end
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local text = string.sub(s, i, ni-1);
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if not string.find(text, "^%s*$") then
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table.insert(top, text);
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end
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if empty == "/" then
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table.insert(top, {label=label, xarg=parseargs_xml(xarg), empty=1});
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elseif c == "" then
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top = {label=label, xarg=parseargs_xml(xarg)};
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table.insert(stack, top);
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else
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local toclose = table.remove(stack);
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top = stack[#stack];
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if #stack < 1 then
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error("nothing to close with "..label);
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end
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if toclose.label ~= label then
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error("trying to close "..toclose.label.." with "..label);
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end
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table.insert(top, toclose);
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end
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i = j+1;
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end
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local text = string.sub(s, i);
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if not string.find(text, "^%s*$") then
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table.insert(stack[stack.n], text);
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end
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if #stack > 1 then
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error("unclosed "..stack[stack.n].label);
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end
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return stack[1];
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end
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function dump(o)
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if type(o) == 'table' then
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local s = '{ '
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for k,v in pairs(o) do
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if type(k) ~= 'number' then k = '"'..k..'"' end
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s = s .. '['..k..'] = ' .. dump(v) .. ','
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end
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return s .. '} '
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else
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return tostring(o)
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end
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end
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-- Used to parse the XML results.
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function getResults(s)
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local xml = parse_xml(s);
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local stack = {}
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local top = {}
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-- freeswitch.consoleLog("crit", "\n" .. dump(xml) .. "\n");
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table.insert(stack, top)
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top = {grammar=xml[2].xarg.grammar, score=xml[2].xarg.confidence, text=xml[2][1][1][1]}
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table.insert(stack, top)
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return top;
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end
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-- This is the input callback used by dtmf or any other events on this session such as ASR.
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function onInput(s, type, obj)
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freeswitch.consoleLog("info", "Callback with type " .. type .. "\n");
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if (type == "dtmf") then
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freeswitch.consoleLog("info", "DTMF Digit: " .. obj.digit .. "\n");
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else if (type == "event") then
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local event = obj:getHeader("Speech-Type");
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if (event == "begin-speaking") then
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freeswitch.consoleLog("info", "\n" .. obj:serialize() .. "\n");
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-- Return break on begin-speaking events to stop playback of the fire or tts.
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return "break";
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end
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if (event == "detected-speech") then
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freeswitch.consoleLog("info", "\n" .. obj:serialize() .. "\n");
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if (obj:getBody()) then
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-- Pause speech detection (this is on auto but pausing it just in case)
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session:execute("detect_speech", "pause");
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-- Parse the results from the event into the results table for later use.
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results = getResults(obj:getBody());
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end
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return "break";
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end
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end
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end
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end
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--Used to map returned names to extension numbers
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extensions = {
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["anthony"] = 3000,
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["michael"] = 3001,
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["brian"] = 3002
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}
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-- Create the empty results table.
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results = {};
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-- Answer the call.
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session:answer();
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-- Define TTS Engine
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session:set_tts_params("flite", "slt");
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-- Register the input callback
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session:setInputCallback("onInput");
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-- Sleep a little bit to give media time to be fully up.
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session:sleep(200);
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session:speak("Welcome to the directory.");
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-- Start the detect_speech app. This attaches the bug to fire events
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session:execute("detect_speech", "pocketsphinx directory directory");
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-- Magic happens here.
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-- It would be ok to loop like 3 times and error to the operator if this doesn't work or revert to reading names off with TTS.
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while (session:ready() == true) do
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session:sleep(100);
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-- Who are they looking for?
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session:speak("Say the name of the person you're trying to reach.");
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-- This sleep is what blocks till the detected-speech event. This has to give you enough time to speak plus get the results.
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session:sleep(3000);
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session:sleep(3000);
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-- If the results aren't null and we have an extension in the table.
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if (results.text ~= nil and extensions[results.text] ~= nil) then
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-- Letting the caller know we are trying.
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session:speak("Please hold while I transfer your call.");
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-- It's critical to stop the detect_detect otherwise it will continue to fire speech events and waste resources.
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session:execute("detect_speech", "stop");
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-- Transfer the call to the extension out of the lua table.
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session:execute("transfer", extensions[results.text] .. " XML default");
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end
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-- We didn't have them in our directory table.
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session:speak("Sorry, I don't have that person listed, please try again.");
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-- Clear any results we have just in case.
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results = {};
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-- Resume detect_speech.
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session:execute("detect_speech", "resume");
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end
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