SillyTavern/public/scripts/extensions/tts/xtts.js

import { doExtrasFetch, getApiUrl, modules } from "../../extensions.js"
import { saveTtsProviderSettings } from "./index.js"

export { XTTSTtsProvider }

class XTTSTtsProvider {
    //########//
    // Config //
    //########//

    settings
    ready = false
    voices = []
    separator = '. '

    languageLabels = {
        "Arabic": "ar",
        "Brazilian Portuguese": "pt",
        "Chinese": "zh-cn",
        "Czech": "cs",
        "Dutch": "nl",
        "English": "en",
        "French": "fr",
        "German": "de",
        "Italian": "it",
        "Polish": "pl",
        "Russian": "ru",
        "Spanish": "es",
        "Turkish": "tr",
        "Japanese": "ja",
        "Korean": "ko",
        "Hungarian": "hu"
    }

    defaultSettings = {
        provider_endpoint: "http://localhost:8020",
        language: "en",
        voiceMap: {}
    }

    get settingsHtml() {
        let html = `
        <label for="xtts_api_language">Language</label>
        <select id="xtts_api_language">`;


        for (let language in this.languageLabels) {

            if (this.languageLabels[language] == this.settings?.language) {
                html += `<option value="${this.languageLabels[language]}" selected="selected">${language}</option>`;
                continue
            }

            html += `<option value="${this.languageLabels[language]}">${language}</option>`;
        }


        html += `
        </select>
        <label for="xtts_tts_endpoint">Provider Endpoint:</label>
        <input id="xtts_tts_endpoint" type="text" class="text_pole" maxlength="250" value="${this.defaultSettings.provider_endpoint}"/>

        `;

        html += `

        <span>
        <span>Use <a target="_blank" href="https://github.com/daswer123/xtts-api-server">XTTSv2 TTS Server</a>.</span>
        `;

        return html;
    }
    onSettingsChange() {
        // Used when provider settings are updated from UI
        this.settings.provider_endpoint = $('#xtts_tts_endpoint').val()
        this.settings.language = $('#xtts_api_language').val()
        saveTtsProviderSettings()
    }

    async loadSettings(settings) {
        // Pupulate Provider UI given input settings
        if (Object.keys(settings).length == 0) {
            console.info("Using default TTS Provider settings")
        }

        // Only accept keys defined in defaultSettings
        this.settings = this.defaultSettings

        for (const key in settings) {
            if (key in this.settings) {
                this.settings[key] = settings[key]
            } else {
                throw `Invalid setting passed to TTS Provider: ${key}`
            }
        }

        const apiCheckInterval = setInterval(() => {
            // Use Extras API if TTS support is enabled
            if (modules.includes('tts') || modules.includes('xtts-tts')) {
                const baseUrl = new URL(getApiUrl());
                baseUrl.pathname = '/api/tts';
                this.settings.provider_endpoint = baseUrl.toString();
                $('#xtts_tts_endpoint').val(this.settings.provider_endpoint);
                clearInterval(apiCheckInterval);
            }
        }, 2000);

        $('#xtts_tts_endpoint').val(this.settings.provider_endpoint)
        $('#xtts_tts_endpoint').on("input", () => { this.onSettingsChange() })
        $('#xtts_api_language').val(this.settings.language)
        $('#xtts_api_language').on("change", () => { this.onSettingsChange() })

        await this.checkReady()

        console.debug("XTTS: Settings loaded")
    }

    // Perform a simple readiness check by trying to fetch voiceIds
    async checkReady() {

        const response = await this.fetchTtsVoiceObjects()
    }

    async onRefreshClick() {
        return
    }

    //#################//
    //  TTS Interfaces //
    //#################//

    async getVoice(voiceName) {
        if (this.voices.length == 0) {
            this.voices = await this.fetchTtsVoiceObjects()
        }
        const match = this.voices.filter(
            XTTSVoice => XTTSVoice.name == voiceName
        )[0]
        if (!match) {
            throw `TTS Voice name ${voiceName} not found`
        }
        return match
    }

    async generateTts(text, voiceId) {
        const response = await this.fetchTtsGeneration(text, voiceId)
        return response
    }

    //###########//
    // API CALLS //
    //###########//
    async fetchTtsVoiceObjects() {
        const response = await doExtrasFetch(`${this.settings.provider_endpoint}/speakers`)
        if (!response.ok) {
            throw new Error(`HTTP ${response.status}: ${await response.json()}`)
        }
        const responseJson = await response.json()
        return responseJson
    }

    async fetchTtsGeneration(inputText, voiceId) {
        console.info(`Generating new TTS for voice_id ${voiceId}`)
        const response = await doExtrasFetch(
            `${this.settings.provider_endpoint}/tts_to_audio/`,
            {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'Cache-Control': 'no-cache'  // Added this line to disable caching of file so new files are always played - Rolyat 7/7/23
                },
                body: JSON.stringify({
                    "text": inputText,
                    "speaker_wav": voiceId,
                    "language": this.settings.language
                })
            }
        )
        if (!response.ok) {
            toastr.error(response.statusText, 'TTS Generation Failed');
            throw new Error(`HTTP ${response.status}: ${await response.text()}`);
        }
        return response
    }

    // Interface not used by XTTS TTS
    async fetchTtsFromHistory(history_item_id) {
        return Promise.resolve(history_item_id);
    }

}