为什么80%的码农都做不了架构师？>>>
前言
最近在调一个别人的项目，项目中用到了语音转文字功能，其中用的平台就是云知声，
浏览了下云知声的官网/，
功能上还是比较的全面，对各个平台的支持也比较的到位；就Android平台来说，官方提供的例子完全够用，
具体使用可以参考这个文档云知声智能语音交互平台-音乐搜索方案 SDK-Android 开发指南；
问题
由于平台高度封装，就基本功能来说都不会有问题，但一些不是很常用的功能往往会变得很棘手。
就比如我遇到的这个问题，需求是要将已经录完的语音转成文字，云知声提供的SDK却已经将录音和服务器请求进行了封装，
你只需要开始然后就会得到结果，对这种已经录好的语音转换却没有提供很好的支持（起码文档中未提到）；
看了下USCRecognizer类的接口，其中有这么一个方法
writePcmData(byte[] arg0, int arg1, int arg2)
我想这个方法的作用就是想满足我的这种需求，但实际测试发现这方法并不好使（也许我调用的方法有问题，
如果你知道正确的使用方法不妨告知我一下，谢谢！）；再到官网查看了下方案，确实有一个音频转写方案，
但只支持Windows、Linux以及Web平台，并没有提供Android的支持；
为了能在Android平台使用只好选择通过Web的方式是达到音频转写的目的了，
本文讲的也就是Android平台通过Http请求实现音频转写功能，废话不多说直接上代码了！
uses-permission
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/><uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/><uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/><uses-permission android:name="android.permission.INTERNET"/><uses-permission android:name="android.permission.RECORD_AUDIO"/>
asr_act.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"xmlns:tools="/tools"android:layout_width="fill_parent"android:layout_height="fill_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:orientation="vertical" ><TextView android:id="@+id/asr_act_info"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_weight="1" /><Button android:id="@+id/asr_act_recognizer"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="Hold and speak" /></LinearLayout>
AsrAct
package com.example.usc;import java.util.ArrayList;import com.example.app.R;import android.media.AudioFormat;import android.media.AudioRecord;import android.media.MediaRecorder;import android.os.Bundle;import android.app.Activity;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.view.View.OnTouchListener;import android.widget.Button;import android.widget.TextView;/*** @project SampleAndroid * @class AsrAct * @description * @author yxmsw* @version * @email yxmsw@ * @data -7-4 下午7:33:23 */public class AsrAct extends Activity implements OnTouchListener{private static final String TAG = AsrAct.class.getSimpleName();private static AudioRecord mRecord; // 音频获取源 private int audioSource = MediaRecorder.AudioSource.MIC; // 设置音频采样率，44100是目前的标准，但是某些设备仍然支持22050，16000，11025 private static int sampleRateInHz = 16000;// 44100; // 设置音频的录制的声道CHANNEL_IN_STEREO为双声道，CHANNEL_CONFIGURATION_MONO为单声道 private static int channelConfig = AudioFormat.CHANNEL_CONFIGURATION_MONO;// AudioFormat.CHANNEL_IN_STEREO; // 音频数据格式:PCM 16位每个样本。保证设备支持。PCM 8位每个样本。不一定能得到设备支持。 private static int audioFormat = AudioFormat.ENCODING_PCM_16BIT; // 音频大小 private int minBufSize; private TextView asr_act_info;private Button asr_act_recognizer;private boolean isRecording = false;private AsrClient mAsrClient;private ArrayList<byte[]> buffers = new ArrayList<byte[]>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.asr_act);Log.d(TAG, "-- onCreate() --");asr_act_info = (TextView) findViewById(R.id.asr_act_info);asr_act_recognizer = (Button) findViewById(R.id.asr_act_recognizer);asr_act_recognizer.setOnTouchListener(this);minBufSize = AudioRecord.getMinBufferSize(sampleRateInHz, channelConfig, audioFormat);mRecord = new AudioRecord(audioSource, sampleRateInHz, channelConfig, audioFormat, minBufSize);mAsrClient = new AsrClient();mAsrClient.setmSampleRate(sampleRateInHz);mAsrClient.setmAudioFormat(audioFormat == AudioFormat.ENCODING_PCM_16BIT ? 16 : 8);}@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (v.getId()) {case R.id.asr_act_recognizer:Log.d(TAG, "-- onTouch() -- id: " + v.getId() + ", action: " + event.getAction());if(event.getAction() == MotionEvent.ACTION_DOWN){asr_act_recognizer.setText("recording");isRecording = true;startRecognizer();} else if(event.getAction() == MotionEvent.ACTION_UP){asr_act_recognizer.setText("Hold and speak");isRecording = false;}break;default:break;}return false;}private void updateView(String result) {asr_act_info.setText(result == null ? "Parse failed!" : result);}private void startRecognizer() { new Thread(new Runnable(){@Overridepublic void run() {// TODO Auto-generated method stubLog.d(TAG, "-- startRecognizer() --");mRecord.startRecording();buffers.clear();// new一个byte数组用来存一些字节数据，大小为缓冲区大小 byte[] audiodata = new byte[minBufSize]; int readsize = 0; while (isRecording == true) { readsize = mRecord.read(audiodata, 0, minBufSize); Log.i("采集大小", String.valueOf(readsize)); if (AudioRecord.ERROR_INVALID_OPERATION != readsize) { byte[] data = new byte[readsize];System.arraycopy(audiodata, 0, data, 0, readsize);buffers.add(data);} } final String result = mAsrClient.parseAudio(buffers);if(result != null) {System.out.println("识别结果:\n" + result);}runOnUiThread(new Runnable() {@Overridepublic void run() {updateView(result);}});}}).start();} }
Config
/*** Config.java [V 1.0.0]* classes : cn.yunzhisheng.prodemo.Config* liujunjie Create at -1-9 ??4:30:32*/package com.example.usc;/*** @project SampleAndroid * @class Config * @description * @author yxmsw* @version * @email yxmsw@ * @data -7-4 下午10:04:55 */public class Config {public static final String URL = "/USCService/WebApi";/*** 云知声开放平台网站上开发者的用户名*/public static final String USER_ID = "YZS1435890548092";/*** 云知声开放平台网站上申请应用后获得的 appKey*/public static final String APP_KEY = "re75bz2b7qu3gd7lupkpw6uonnsejr7t5ueresyv";/*** 标记请求来源的标识，如用户所设备序列号 (SN)，IMEI，MAC地址等*/public static final String DEVICE_ID = "IMEI1234567890";public static final int SAMPLE_RATE = 16000;public static final int AUDIO_FORMATE = 16;public static final String LANGUAGE = "zh_CN";public static final String CHARSET = "utf-8";/*** "general", "poi", "song", "movietv", "medical"*/public static final String ENGINE = "general";}
AsrClient
package com.example.usc;import java.io.BufferedReader;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import .HttpURLConnection;import .URL;import java.util.ArrayList;import android.util.Log;/*** @project SampleAndroid * @class AsrClient * @description * @author yxmsw* @version * @email yxmsw@ * @data -7-4 下午10:05:39 */public class AsrClient {private static final String TAG = AsrClient.class.getSimpleName();private String mWebApiUrl;/*** 云知声开放平台网站上开发者的用户名*/private String mUserId;/*** 云知声开放平台网站上申请应用后获得的 appKey*/private String mAppKey;/*** 标记请求来源的标识，如用户所设备序列号 (SN)，IMEI，MAC地址等*/private String mDeviceId;private int mAudioFormat; private int mSampleRate; private String mLanguage; private String mCharset; /*** "general", "poi", "song", "movietv", "medical"*/private String mEngine; public AsrClient() {this.mWebApiUrl = Config.URL;this.mUserId = Config.USER_ID;this.mAppKey = Config.APP_KEY;this.mDeviceId = Config.DEVICE_ID;this.mAudioFormat = Config.AUDIO_FORMATE;this.mSampleRate = Config.SAMPLE_RATE;this.mLanguage = Config.LANGUAGE;this.mCharset = Config.CHARSET;this.mEngine = Config.ENGINE;}public String getmWebApiUrl() {return mWebApiUrl;}public void setmWebApiUrl(String mWebApiUrl) {this.mWebApiUrl = mWebApiUrl;}public String getmUserId() {return mUserId;}public void setmUserId(String mUserId) {this.mUserId = mUserId;}public String getmAppKey() {return mAppKey;}public void setmAppKey(String mAppKey) {this.mAppKey = mAppKey;}public String getmDeviceId() {return mDeviceId;}public void setmDeviceId(String mDeviceId) {this.mDeviceId = mDeviceId;}public int getmAudioFormat() {return mAudioFormat;}public void setmAudioFormat(int mAudioFormat) {this.mAudioFormat = mAudioFormat;}public int getmSampleRate() {return mSampleRate;}public void setmSampleRate(int mSampleRate) {this.mSampleRate = mSampleRate;}public String getmLanguage() {return mLanguage;}public void setmLanguage(String mLanguage) {this.mLanguage = mLanguage;}public String getmCharset() {return mCharset;}public void setmCharset(String mCharset) {this.mCharset = mCharset;}public String getmEngine() {return mEngine;}public void setmEngine(String mEngine) {this.mEngine = mEngine;}public String parseAudio(ArrayList<byte[]> buffers) {int length = 0;for (int i = 0; i < buffers.size(); i++) {length += buffers.get(i).length;}return parseAudio(buffers, length);}public String parseAudio(ArrayList<byte[]> buffers, int length) {byte[] data = new byte[length];int off = 0;for (int i = 0; i < buffers.size(); i++) {byte[] buffer = buffers.get(i);int len = buffer.length;if (off + len <= length) {System.arraycopy(buffer, 0, data, off, len);off += len;}}return parseAudio(data);}public String parseAudio(byte[] buffer) {HttpURLConnection conn = null;FileInputStream inputStream = null;try {URL url = new URL(this.mWebApiUrl + "?appkey=" + this.mAppKey+ "&userid=" + this.mUserId + "&id=" + this.mDeviceId);conn = (HttpURLConnection) url.openConnection();// 上传的语音数据流格式conn.setRequestProperty("Content-Type", "audio/x-wav;codec=pcm;bit=" + this.mAudioFormat + ";rate=" + this.mSampleRate);// 识别结果返回的格式conn.setRequestProperty("Accept", "text/plain");// 语音数据流记录的语种及识别结果的语种conn.setRequestProperty("Accept-Language", this.mLanguage);// 编码格式conn.setRequestProperty("Accept-Charset", this.mCharset);// 指定ASR识别的引擎conn.setRequestProperty("Accept-Topic", this.mEngine);conn.setRequestMethod("POST");conn.setDoInput(true);conn.setDoOutput(true);OutputStream out = conn.getOutputStream();// 上传语音数据out.write(buffer);out.flush();out.close();// 获取结果if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {BufferedReader resultReader = new BufferedReader(new InputStreamReader(conn.getInputStream(), this.mCharset));String line = "";String result = "";while ((line = resultReader.readLine()) != null) {result += line;}resultReader.close();return result;} else {Log.w(TAG, "Parse failed! ResponseCode = " + conn.getResponseCode());}} catch (Exception e) {e.printStackTrace();} finally {if (conn != null) {conn.disconnect();}if (inputStream != null) {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}}return null;}}
源码下载
SampleAndroid
