Google Speech Recognition（ASR）

        Google的語音識別API至今仍未正式發佈，沒有很詳細的開發文檔，只提供一個Service 服務。 Google ASR的API需要提供flac格式的音頻，格式轉換，可以使用ffmpeg庫來處理。當中涉及到具體的庫有：json，httpclient， httpcore和commons-logging包。具體代碼如下：

import java.io.*;
import java.net.MalformedURLException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.params.ConnRoutePNames;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.util.EntityUtils;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;


public class voiceRecognition {
	private static final String SERVER="http://www.google.com/speech-api/v1/recognize?lang=zh-CN&client=chromium&maxresults=1";//en-US
	private static final String HeaderType = "Content-Type";
	private static final String HeaderContent = "audio/x-flac; rate=8000";
	private static final String User_Agent = "Mozilla/5.0";
	
	private static String parse(JSONObject obj){
		JSONArray array=(JSONArray)obj.get("hypotheses");
		JSONObject result=(JSONObject)array.get(0);
		String sentence=(String)result.get("utterance");
		return sentence;
	}
	public static String recognise(String voiceFile) {
		
		HttpClient httpclient = new DefaultHttpClient();
		HttpPost httppost= new HttpPost(SERVER);
		HttpProtocolParams.setUserAgent(httpclient.getParams(), User_Agent);
		httppost.setHeader(HeaderType,HeaderContent);
		
		try {
			File file = new File(voiceFile);
			InputStreamEntity reqEntity = new InputStreamEntity(
					new FileInputStream(file), -1);
			reqEntity.setContentType("binary/octet-stream");
			httppost.setEntity(reqEntity);
			HttpResponse response = httpclient.execute(httppost);
			HttpEntity resEntity = response.getEntity();
			String buffer;
			String jsonResponse = "";
			BufferedReader br = new BufferedReader(new InputStreamReader(resEntity.getContent()));
			while ((buffer = br.readLine()) != null) {
				jsonResponse += buffer;
			}
			EntityUtils.consume(resEntity);
			br.close();
			JSONParser parser = new JSONParser();
            JSONObject obj = (JSONObject) parser.parse(jsonResponse);
            String result=parse(obj);

            return result;
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch(IOException e){
			e.printStackTrace();
		}catch (ParseException e) {
            e.printStackTrace();
        }finally{
        	httpclient.getConnectionManager().shutdown();
        }
		return null;
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String voiceFile = "1.flac";
		String result = recognise(voiceFile);
		System.out.println(result);
	}

}

API其他相關信息：

Chrome 11 API：  http://mikepultz.com/2011/03/accessing-google-speech-api-chrome-11/

其他開發介紹：http://blog.csdn.net/dlangu0393/article/details/7214728

              http://blog.laobubu.net/546

ffmpeg庫： http://ffmpeg.org/