package com.darkprograms.speech.synthesiser;
import com.darkprograms.speech.translator.GoogleTranslate;
import java.io.IOException;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
/*******************************************************************************
* Synthesiser class that connects to Google's unoffical API to retrieve data
*
* @author Luke Kuza, Aaron Gokaslan (Skylion)
*******************************************************************************/
public abstract class BaseSynthsiser {
/**
* Gets an input stream to MP3 data for the returned information from a request
*
* @param synthText Text you want to be synthesized into MP3 data
* @return Returns an input stream of the MP3 data that is returned from Google
* @throws IOException Throws exception if it can not complete the request
*/
public abstract InputStream getMP3Data(String synthText) throws IOException;
/**
* Gets an InputStream to MP3Data for the returned information from a request
* @param synthText List of Strings you want to be synthesized into MP3 data
* @return Returns an input stream of all the MP3 data that is returned from Google
* @throws IOException Throws exception if it cannot complete the request
*/
public InputStream getMP3Data(List<String> synthText) throws IOException {
//Uses an executor service pool for concurrency. Limit to 1000 threads max.
ExecutorService pool = Executors.newFixedThreadPool(1000);
//Stores the Future (Data that will be returned in the future)
Set<Future<InputStream>> set = new LinkedHashSet<Future<InputStream>>(synthText.size());
for(String part: synthText){ //Iterates through the list
Callable<InputStream> callable = new MP3DataFetcher(part);//Creates Callable
Future<InputStream> future = pool.submit(callable);//Begins to run Callable
set.add(future);//Adds the response that will be returned to a set.
}
List<InputStream> inputStreams = new ArrayList<InputStream>(set.size());
for(Future<InputStream> future: set){
try {
inputStreams.add(future.get());//Gets the returned data from the future.
} catch (ExecutionException e) {//Thrown if the MP3DataFetcher encountered an error.
Throwable ex = e.getCause();
if(ex instanceof IOException){
throw (IOException)ex;//Downcasts and rethrows it.
}
} catch (InterruptedException e){//Will probably never be called, but just in case...
Thread.currentThread().interrupt();//Interrupts the thread since something went wrong.
}
}
return new SequenceInputStream(Collections.enumeration(inputStreams));//Sequences the stream.
}
/**
* Separates a string into smaller parts so that Google will not reject the request.
* @param input The string you want to separate
* @return A List<String> of the String fragments from your input..
*/
protected List<String> parseString(String input){
return parseString (input, new ArrayList<String>());
}
/**
* Separates a string into smaller parts so that Google will not reject the request.
* @param input The string you want to break up into smaller parts
* @param fragments List<String> that you want to add stuff too.
* If you don't have a List<String> already constructed "new ArrayList<String>()" works well.
* @return A list of the fragments of the original String
*/
private List<String> parseString(String input, List<String> fragments){
if(input.length()<=100){//Base Case
fragments.add(input);
return fragments;
}
else{
int lastWord = findLastWord(input);//Checks if a space exists
if(lastWord<=0){
fragments.add(input.substring(0,100));//In case you sent gibberish to Google.
return parseString(input.substring(100), fragments);
}else{
fragments.add(input.substring(0,lastWord));
//Otherwise, adds the last word to the list for recursion.
return parseString(input.substring(lastWord), fragments);
}
}
}
/**
* Finds the last word in your String (before the index of 99) by searching for spaces and ending punctuation.
* Will preferably parse on punctuation to alleviate mid-sentence pausing
* @param input The String you want to search through.
* @return The index of where the last word of the string ends before the index of 99.
*/
private int findLastWord(String input){
if(input.length()<100)
return input.length();
int space = -1;
for(int i = 99; i>0; i--){
char tmp = input.charAt(i);
if(isEndingPunctuation(tmp)){
return i+1;
}
if(space==-1 && tmp == ' '){
space = i;
}
}
if(space>0){
return space;
}
return -1;
}
/**
* Checks if char is an ending character
* Ending punctuation for all languages according to Wikipedia (Except for Sanskrit non-unicode)
* @param input The char you want check
* @return True if it is, false if not.
*/
private boolean isEndingPunctuation(char input){
return input == '.' || input == '!' || input == '?' || input == ';' || input == ':' || input == '|';
}
/**
* Automatically determines the language of the original text
* @param text represents the text you want to check the language of
* @return the languageCode in ISO-639
* @throws IOException if it cannot complete the request
*/
public String detectLanguage(String text) throws IOException{
return GoogleTranslate.detectLanguage(text);
}
/**
* This class is a callable.
* A callable is like a runnable except that it can return data and throw exceptions.
* Useful when using futures. Dramatically improves the speed of execution.
* @author Aaron Gokaslan (Skylion)
*/
private class MP3DataFetcher implements Callable<InputStream>{
private String synthText;
public MP3DataFetcher(String synthText){
this.synthText = synthText;
}
public InputStream call() throws IOException{
return getMP3Data(synthText);
}
}
}