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Merge pull request #439 from peuter/speech
add simple text to speech plugin
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /* structure_plugin.js (c) 2010 by Christian Mayer [CometVisu at ChristianMayer dot de] | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify it | ||
| * under the terms of the GNU General Public License as published by the Free | ||
| * Software Foundation; either version 3 of the License, or (at your option) | ||
| * any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, but WITHOUT | ||
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
| * more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License along | ||
| * with this program; if not, write to the Free Software Foundation, Inc., | ||
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA | ||
| */ | ||
|
|
||
| /** | ||
| * Use the Web Speech API (https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API) | ||
| * to make text-to-speech service available. This plugin listens to a address and forwards the | ||
| * incoming data to the browser TTS engine (if the browser supports it) | ||
| * | ||
| * Example: | ||
| * <speech lang="de"> | ||
| * <address transform="OH:string" mode="read">Speak</address> | ||
| * </speech> | ||
| */ | ||
| define( ['structure_custom' ], function( VisuDesign_Custom ) { | ||
| "use strict"; | ||
|
|
||
| var lastSpeech = {}; | ||
| /** | ||
| * This is a custom function that extends the available widgets. | ||
| * It's purpose is to change the design of the visu during runtime | ||
| * to demonstrate all available | ||
| */ | ||
| VisuDesign_Custom.prototype.addCreator("speech", { | ||
|
|
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| create: function( element, path) { | ||
| if (!window.speechSynthesis) { | ||
| console.log("this browser does not support the Web Speech API"); | ||
| return ""; | ||
| } | ||
| var $e = $(element); | ||
| var address = templateEngine.design.makeAddressList($e, false, path); | ||
|
|
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| templateEngine.widgetDataInsert( path, { | ||
| 'language' : $e.attr('lang') ? $e.attr('lang').toLowerCase() : null, | ||
| 'address' : address, | ||
| 'type' : 'speech' | ||
| }); | ||
| return ""; | ||
| }, | ||
|
|
||
| update: function(address, text) { | ||
| if (!templateEngine.visu.dataReceived) { | ||
| // first call -> skipping | ||
| console.log("skipping initial TTS for "+text); | ||
| return; | ||
| } | ||
|
|
||
| if (!text || text.length === 0) { | ||
| // nothing to say | ||
| return; | ||
| } | ||
|
|
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| if (lastSpeech[address] == text) { | ||
| // do not repeat | ||
| console.log("skipping TTS because of repetition "+text); | ||
| return; | ||
| } | ||
| lastSpeech[address] = text; | ||
|
|
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| var element = $(this); | ||
| var path = element.attr('id'); | ||
| var data = templateEngine.widgetDataGet(path); | ||
|
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| var synth = window.speechSynthesis; | ||
|
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| // speak | ||
| var utterThis = new SpeechSynthesisUtterance(text); | ||
|
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| var selectedVoice, defaultVoice; | ||
| var voices = synth.getVoices(); | ||
| for (var i = 0, l = voices.length; i < l; i++) { | ||
| if (data.language && voices[i].lang.substr(0, 2).toLowerCase() === data.language) { | ||
| selectedVoice = voices[i]; | ||
| } | ||
| if (voices[i].default) { | ||
| defaultVoice = voices[i]; | ||
| } | ||
| } | ||
| if (!selectedVoice) { | ||
| selectedVoice = defaultVoice; | ||
| } | ||
| utterThis.voice = selectedVoice; | ||
| synth.speak(utterThis); | ||
| } | ||
| }); | ||
|
|
||
| }); |
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