mirror of
https://github.com/rhasspy/espeak-ng.git
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309 lines
10 KiB
Java
309 lines
10 KiB
Java
/*
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* Copyright (C) 2012 Reece H. Dunn
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* Copyright (C) 2011 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* This file implements the Android Text-to-Speech engine for eSpeak.
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*
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* Android Version: 4.0 (Ice Cream Sandwich)
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* API Version: 14
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*/
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package com.reecedunn.espeak;
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import android.annotation.SuppressLint;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.content.SharedPreferences;
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import android.media.AudioTrack;
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import android.os.Bundle;
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import android.preference.PreferenceManager;
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import android.speech.tts.SynthesisCallback;
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import android.speech.tts.SynthesisRequest;
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import android.speech.tts.TextToSpeech;
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import android.speech.tts.TextToSpeechService;
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import android.util.Log;
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import com.reecedunn.espeak.SpeechSynthesis.SynthReadyCallback;
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import com.reecedunn.espeak.SpeechSynthesis.Voice;
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import java.util.List;
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import java.util.Locale;
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/**
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* Implements the eSpeak engine as a {@link TextToSpeechService}.
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*
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* @author msclrhd@gmail.com (Reece H. Dunn)
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* @author alanv@google.com (Alan Viverette)
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*/
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@SuppressLint("NewApi")
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public class TtsService extends TextToSpeechService {
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private static final String TAG = TtsService.class.getSimpleName();
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private static final boolean DEBUG = false;
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private static final String DEFAULT_LANGUAGE = "en";
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private static final String DEFAULT_COUNTRY = "uk";
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private static final String DEFAULT_VARIANT = "";
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private SpeechSynthesis mEngine;
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private SynthesisCallback mCallback;
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private boolean mEngineInitialized = false;
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private List<Voice> mAvailableVoices;
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private Voice mMatchingVoice = null;
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private String mLanguage = DEFAULT_LANGUAGE;
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private String mCountry = DEFAULT_COUNTRY;
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private String mVariant = DEFAULT_VARIANT;
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@Override
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public void onCreate() {
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super.onCreate();
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if (!CheckVoiceData.hasBaseResources(this)) {
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final IntentFilter filter =
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new IntentFilter(DownloadVoiceData.BROADCAST_LANGUAGES_UPDATED);
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registerReceiver(mBroadcastReceiver, filter);
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final Intent intent = new Intent(this, DownloadVoiceData.class);
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intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
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startActivity(intent);
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return;
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}
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initializeTtsEngine();
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}
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/**
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* Sets up the native eSpeak engine.
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*/
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private void initializeTtsEngine() {
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if (mEngine != null) {
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mEngine.stop();
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mEngine = null;
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}
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mEngine = new SpeechSynthesis(this, mSynthCallback);
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mEngineInitialized = true;
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mAvailableVoices = mEngine.getAvailableVoices();
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}
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@Override
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protected String[] onGetLanguage() {
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// This is used to specify the language requested from GetSampleText.
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return new String[] {
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mLanguage, mCountry, mVariant
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};
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}
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@Override
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protected int onIsLanguageAvailable(String language, String country, String variant) {
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if (!mEngineInitialized ||
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!CheckVoiceData.hasBaseResources(this) ||
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CheckVoiceData.canUpgradeResources(this)) {
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return TextToSpeech.LANG_MISSING_DATA;
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}
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final Locale query = new Locale(language, country, variant);
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Voice languageVoice = null;
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Voice countryVoice = null;
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synchronized (mAvailableVoices) {
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for (Voice voice : mAvailableVoices) {
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switch (voice.match(query)) {
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case TextToSpeech.LANG_COUNTRY_VAR_AVAILABLE:
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mMatchingVoice = voice;
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return TextToSpeech.LANG_COUNTRY_VAR_AVAILABLE;
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case TextToSpeech.LANG_COUNTRY_AVAILABLE:
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countryVoice = voice;
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case TextToSpeech.LANG_AVAILABLE:
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languageVoice = voice;
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break;
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}
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}
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}
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if (languageVoice == null) {
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mMatchingVoice = null;
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return TextToSpeech.LANG_NOT_SUPPORTED;
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} else if (countryVoice == null) {
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mMatchingVoice = languageVoice;
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return TextToSpeech.LANG_AVAILABLE;
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} else {
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mMatchingVoice = countryVoice;
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return TextToSpeech.LANG_COUNTRY_AVAILABLE;
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}
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}
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@Override
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protected int onLoadLanguage(String language, String country, String variant) {
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final int result = onIsLanguageAvailable(language, country, variant);
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switch (result) {
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case TextToSpeech.LANG_AVAILABLE:
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synchronized (this) {
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mLanguage = language;
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mCountry = "";
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mVariant = "";
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}
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break;
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case TextToSpeech.LANG_COUNTRY_AVAILABLE:
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synchronized (this) {
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mLanguage = language;
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mCountry = ((country == null) ? "" : country);
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mVariant = "";
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}
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break;
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case TextToSpeech.LANG_COUNTRY_VAR_AVAILABLE:
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synchronized (this) {
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mLanguage = language;
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mCountry = ((country == null) ? "" : country);
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mVariant = ((variant == null) ? "" : variant);
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}
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break;
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case TextToSpeech.LANG_NOT_SUPPORTED:
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Log.e(TAG, "Unsupported language {language='" + language + "', country='" + country
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+ "', variant='" + variant + "'}");
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break;
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}
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return result;
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}
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@Override
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protected void onStop() {
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Log.i(TAG, "Received stop request.");
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mEngine.stop();
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}
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@Override
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protected synchronized void onSynthesizeText(
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SynthesisRequest request, SynthesisCallback callback) {
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final int result = onLoadLanguage(request.getLanguage(), request.getCountry(), request.getVariant());
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switch (result) {
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case TextToSpeech.LANG_MISSING_DATA:
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case TextToSpeech.LANG_NOT_SUPPORTED:
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return;
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}
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final String text = request.getText();
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final int gender = getDefaultGender();
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final int rate = scaleRate(request.getSpeechRate());
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final int pitch = scalePitch(request.getPitch());
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final Bundle params = request.getParams();
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if (DEBUG) {
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Log.i(TAG, "Received synthesis request: {language=\"" + mMatchingVoice.name + "\"}");
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for (String key : params.keySet()) {
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Log.v(TAG,
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"Synthesis request contained param {" + key + ", " + params.get(key) + "}");
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}
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}
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mCallback = callback;
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mCallback.start(mEngine.getSampleRate(), mEngine.getAudioFormat(),
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mEngine.getChannelCount());
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mEngine.setVoiceByProperties(null, mMatchingVoice.name, gender, 0, 0);
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mEngine.setRate(rate);
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mEngine.setPitch(pitch);
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mEngine.synthesize(text);
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}
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/**
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* Scales the pitch by the user-specified value.
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*
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* @param pitch A pitch value.
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* @return A scaled pitch value.
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*/
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private int scalePitch(int pitch) {
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final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
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final String defaultPitchString = prefs.getString("default_pitch", "100");
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final int defaultPitch = Integer.parseInt(defaultPitchString);
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return (pitch * defaultPitch / 100);
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}
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/**
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* Returns user-specified gender.
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*
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* @return A gender value.
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*/
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private int getDefaultGender() {
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final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
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final String defaultGenderString = prefs.getString("default_gender", "0");
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final int defaultGender = Integer.parseInt(defaultGenderString);
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return defaultGender;
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}
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/**
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* Scales the rate by the user-specified value.
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*
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* @param rate A rate value.
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* @return A scaled rate value.
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*/
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private int scaleRate(int rate) {
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final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
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final String defaultRateString = prefs.getString("default_rate", "100");
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final int defaultRate = Integer.parseInt(defaultRateString);
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return (rate * defaultRate / 100);
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}
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/**
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* Pipes synthesizer output from native eSpeak to an {@link AudioTrack}.
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*/
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private final SpeechSynthesis.SynthReadyCallback mSynthCallback = new SynthReadyCallback() {
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@Override
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public void onSynthDataReady(byte[] audioData) {
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if ((audioData == null) || (audioData.length == 0)) {
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onSynthDataComplete();
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return;
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}
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final int maxBytesToCopy = mCallback.getMaxBufferSize();
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int offset = 0;
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while (offset < audioData.length) {
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final int bytesToWrite = Math.min(maxBytesToCopy, (audioData.length - offset));
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mCallback.audioAvailable(audioData, offset, bytesToWrite);
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offset += bytesToWrite;
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}
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}
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@Override
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public void onSynthDataComplete() {
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mCallback.done();
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}
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};
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/**
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* Listens for language update broadcasts and initializes the eSpeak engine.
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*/
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private final BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
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@Override
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public void onReceive(Context context, Intent intent) {
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initializeTtsEngine();
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}
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};
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}
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