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talkie-speaker.js
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talkie-speaker.js
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/*
This file is part of Talkie -- text-to-speech browser extension button.
<https://joelpurra.com/projects/talkie/>
Copyright (c) 2016, 2017, 2018, 2019, 2020 Joel Purra <https://joelpurra.com/>
Talkie 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.
Talkie 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 Talkie. If not, see <https://www.gnu.org/licenses/>.
*/
import {
logDebug,
logInfo,
logError,
} from "../shared/log";
import {
promiseTry,
promiseSeries,
promiseTimeout,
} from "../shared/promise";
import {
flatten,
} from "../shared/basic";
import {
knownEvents,
} from "../shared/events";
import {
resolveVoice,
rateRange,
pitchRange,
} from "../shared/voices";
import TextHelper from "./text-helper";
export default class TalkieSpeaker {
// https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html#tts-section
// https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html#examples-synthesis
// https://developer.mozilla.org/en-US/docs/Web/API/Web_Speech_API/Using_the_Web_Speech_API#Speech_synthesis
constructor(broadcaster, shouldContinueSpeakingProvider, contentLogger, storageManager) {
this.broadcaster = broadcaster;
this.shouldContinueSpeakingProvider = shouldContinueSpeakingProvider;
this.contentLogger = contentLogger;
this.storageManager = storageManager;
this.resetSynthesizer();
this.speakLongTextsStorageKey = "speak-long-texts";
this.MAX_UTTERANCE_TEXT_LENGTH = 100;
}
getSynthesizerFromBrowser() {
return promiseTry(
() => {
logDebug("Start", "getSynthesizerFromBrowser", "Pre-requisites check");
if (!("speechSynthesis" in window) || typeof window.speechSynthesis.getVoices !== "function" || typeof window.speechSynthesis.speak !== "function") {
throw new Error("The browser does not support speechSynthesis.");
}
if (!("SpeechSynthesisUtterance" in window)) {
throw new Error("The browser does not support SpeechSynthesisUtterance.");
}
logDebug("Done", "getSynthesizerFromBrowser", "Pre-requisites check");
})
.then(() => {
logDebug("Start", "getSynthesizerFromBrowser");
// NOTE: the speech synthesizer can only be used in Chrome after the voices have been loaded.
const synthesizer = window.speechSynthesis;
// https://github.com/mdn/web-speech-api/blob/gh-pages/speak-easy-synthesis/script.js#L33-L36
// NOTE: The synthesizer will work right away in Firefox.
const voices = synthesizer.getVoices();
if (Array.isArray(voices) && voices.length > 0) {
logDebug("Done", "getSynthesizerFromBrowser (direct)");
return synthesizer;
}
const asyncSynthesizerInitialization = new Promise(
(resolve, reject) => {
try {
logDebug("Start", "getSynthesizerFromBrowser (event-based)");
const handleVoicesChanged = () => {
synthesizer.removeEventListener("error", handleError);
synthesizer.removeEventListener("voiceschanged", handleVoicesChanged);
logDebug("Variable", "synthesizer", synthesizer);
logDebug("Done", "getSynthesizerFromBrowser (event-based)");
return resolve(synthesizer);
};
const handleError = (event) => {
synthesizer.removeEventListener("error", handleError);
synthesizer.removeEventListener("voiceschanged", handleVoicesChanged);
logError("getSynthesizerFromBrowser", event);
return reject(event.error);
};
// NOTE: Chrome needs to wait for the onvoiceschanged event before using the synthesizer.
synthesizer.addEventListener("voiceschanged", handleVoicesChanged);
synthesizer.addEventListener("error", handleError);
} catch (error) {
return reject(error);
}
},
);
return promiseTimeout(asyncSynthesizerInitialization, 1000)
.catch((error) => {
// TODO: remove the specific listeners previously registered.
if (error && error.name === "PromiseTimeout") {
logDebug("Done", "getSynthesizerFromBrowser (timeout)", "asyncSynthesizerInitialization", error);
// NOTE: assume the synthesizer has somehow been initialized without triggering the onvoiceschanged event.
return synthesizer;
}
logError("getSynthesizerFromBrowser", "asyncSynthesizerInitialization", error);
throw error;
});
})
.then((synthesizer) => {
// NOTE: only for logging purposes.
const voices = synthesizer.getVoices();
logDebug("Variable", "getSynthesizerFromBrowser", "voices[]", voices.length, voices);
return synthesizer;
});
}
resetSynthesizer() {
return promiseTry(
() => {
delete this.cachedSynthesizer;
this.cachedSynthesizer = null;
return undefined;
},
);
}
getSynthesizer() {
return promiseTry(
() => {
if (this.cachedSynthesizer !== null) {
return this.cachedSynthesizer;
}
return this.getSynthesizerFromBrowser()
.then((synthesizer) => {
this.cachedSynthesizer = synthesizer;
return this.cachedSynthesizer;
});
},
);
}
getAllVoices() {
return promiseTry(
() => this.getSynthesizer()
.then((synthesizer) => {
return synthesizer.getVoices();
}),
);
}
stopSpeaking() {
return promiseTry(
() => {
logDebug("Start", "stopSpeaking");
return this.getSynthesizer()
.then((synthesizer) => {
const eventData = {};
return Promise.resolve()
.then(() => this.broadcaster.broadcastEvent(knownEvents.stopSpeaking, eventData))
.then(() => {
synthesizer.cancel();
// NOTE: reset the system to resume playback, just to be nice to the world.
synthesizer.resume();
logDebug("Done", "stopSpeaking");
return undefined;
});
});
},
);
}
speakPartOfText(utterance) {
return this.getSynthesizer()
.then((synthesizer) => new Promise(
(resolve, reject) => {
try {
logDebug("Start", "speakPartOfText", `Speak text part (length ${utterance.text.length}): "${utterance.text}"`);
const handleEnd = (event) => {
utterance.removeEventListener("end", handleEnd);
utterance.removeEventListener("error", handleEnd);
logDebug("End", "speakPartOfText", `Speak text part (length ${utterance.text.length}) spoken in ${event.elapsedTime} milliseconds.`);
return resolve();
};
const handleError = (event) => {
utterance.removeEventListener("end", handleEnd);
utterance.removeEventListener("error", handleEnd);
logError("speakPartOfText", `Speak text part (length ${utterance.text.length})`, event);
return reject(event.error);
};
utterance.addEventListener("end", handleEnd);
utterance.addEventListener("error", handleError);
// The actual act of speaking the text.
synthesizer.speak(utterance);
// NOTE: pause/resume suggested (for longer texts) in Chrome bug reports, trying it for shorter texts as well.
// https://bugs.chromium.org/p/chromium/issues/detail?id=335907
// https://bugs.chromium.org/p/chromium/issues/detail?id=369472
synthesizer.pause();
synthesizer.resume();
logDebug("Variable", "synthesizer", synthesizer);
logDebug("Done", "speakPartOfText", `Speak text part (length ${utterance.text.length})`);
} catch (error) {
return reject(error);
}
},
),
);
}
getActualVoice(mappedVoice) {
return promiseTry(
() => {
logDebug("Start", "getActualVoice", mappedVoice);
return resolveVoice(mappedVoice)
.then((actualVoice) => {
logDebug("Done", "getActualVoice", mappedVoice, actualVoice);
return actualVoice;
})
.catch((error) => {
logError("getActualVoice", mappedVoice, error);
throw error;
});
},
);
}
splitAndSpeak(text, voice) {
return promiseTry(
() => {
logDebug("Start", "splitAndSpeak", `Speak text (length ${text.length}): "${text}"`);
const speakingEventData = {
text: text,
voice: voice.name,
language: voice.lang,
};
return Promise.resolve()
.then(() => this.broadcaster.broadcastEvent(knownEvents.beforeSpeaking, speakingEventData))
.then(() => {
// HACK: keep a reference to the utterance attached to the window. Not sure why this helps, but might prevent garbage collection or something.
delete window.talkieUtterance;
return undefined;
})
.then(() => Promise.all([
this.getActualVoice(voice),
this.storageManager.getStoredValue(this.speakLongTextsStorageKey),
]))
.then(([actualVoice, speakLongTexts]) => {
const paragraphs = TextHelper.splitTextToParagraphs(text);
let textParts = null;
if (speakLongTexts === true) {
textParts = paragraphs;
} else {
const cleanTextParts = paragraphs.map((paragraph) => TextHelper.splitTextToSentencesOfMaxLength(paragraph, this.MAX_UTTERANCE_TEXT_LENGTH));
textParts = flatten(cleanTextParts);
}
logDebug("Variable", "textParts.length", textParts.length);
const shouldContinueSpeaking = this.shouldContinueSpeakingProvider.getShouldContinueSpeakingProvider();
const textPartsPromises = textParts
.map((textPart) => () => {
const speakingPartEventData = {
textPart: textPart,
voice: voice.name,
language: voice.lang,
};
return shouldContinueSpeaking()
.then((continueSpeaking) => {
if (continueSpeaking) {
return Promise.resolve()
.then(() => this.broadcaster.broadcastEvent(knownEvents.beforeSpeakingPart, speakingPartEventData))
.then(() => {
const utterance = new window.SpeechSynthesisUtterance(textPart);
utterance.voice = actualVoice;
utterance.rate = voice.rate || rateRange.default;
utterance.pitch = voice.pitch || pitchRange.default;
logDebug("Variable", "utterance", utterance);
// HACK: keep a reference to the utterance attached to the window. Not sure why this helps, but might prevent garbage collection or something.
window.talkieUtterance = utterance;
return utterance;
})
.then((utterance) => this.speakPartOfText(utterance))
.then(() => this.broadcaster.broadcastEvent(knownEvents.afterSpeakingPart, speakingPartEventData));
}
return undefined;
});
});
return promiseSeries(textPartsPromises);
})
.then(() => {
// HACK: keep a reference to the utterance attached to the window. Not sure why this helps, but might prevent garbage collection or something.
delete window.talkieUtterance;
return undefined;
})
.then(() => this.broadcaster.broadcastEvent(knownEvents.afterSpeaking, speakingEventData));
},
);
}
speakTextInVoice(text, voice) {
return promiseTry(
() => Promise.resolve()
.then(() => {
this.contentLogger.logToPage(`Speaking text (length ${text.length}, ${voice.name}, ${voice.lang}): ${text}`)
.catch((error) => {
// NOTE: swallowing any logToPage() errors.
// NOTE: reduced logging for known tab/page access problems.
if (error && typeof error.message === "string" && error.message.startsWith("Cannot access")) {
logDebug("getSelectionsWithValidTextAndDetectedLanguageAndEffectiveLanguage", "Error", error);
} else {
logInfo("getSelectionsWithValidTextAndDetectedLanguageAndEffectiveLanguage", "Error", error);
}
return undefined;
});
return this.splitAndSpeak(text, voice);
})
.then(() => {
logDebug("Done", "speakTextInVoice", `Speak text (length ${text.length}, ${voice.name}, ${voice.lang})`);
return undefined;
}),
);
}
speakTextInLanguage(text, language) {
return promiseTry(
() => {
const voice = {
name: null,
lang: language,
};
return Promise.resolve()
.then(() => {
return this.speakTextInVoice(text, voice);
})
.then(() => logDebug("Done", "speakTextInLanguage", `Speak text (length ${text.length}, ${language})`));
},
);
}
}