我发现这个 android 代码可以在他/她开始说话时录制用户声音，并在他/她停止时停止录制。但问题是录音很快就停止了。如果一个人想说两个词，它只记录第一个词。
如何更改以下代码以使录制过程对瞬间静音不那么敏感？
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final int RECORDER_BPP = 16;
int RECORDER_SAMPLERATE = 8000;
int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
// Get the minimum buffer size required for the successful creation of
// an AudioRecord object.
int bufferSizeInBytes = AudioRecord
.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING);
// Initialize Audio Recorder.
AudioRecord audioRecorder = new AudioRecord(
MediaRecorder.AudioSource.MIC, RECORDER_SAMPLERATE,
RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSizeInBytes);
// Start Recording.
audioRecorder.startRecording();
int numberOfReadBytes = 0;
byte audioBuffer[] = new byte[bufferSizeInBytes];
boolean recording = false;
float tempFloatBuffer[] = new float[3];
int tempIndex = 0;
int totalReadBytes = 0;
byte totalByteBuffer[] = new byte[60 * 44100 * 2];
// While data come from microphone.
while (true) {
float totalAbsValue = 0.0f;
short sample = 0;
numberOfReadBytes = audioRecorder.read(audioBuffer, 0,
bufferSizeInBytes);
// Analyze Sound.
for (int i = 0; i < bufferSizeInBytes; i += 2) {
sample = (short) ((audioBuffer[i]) | audioBuffer[i + 1] << 8);
totalAbsValue += Math.abs(sample) / (numberOfReadBytes / 2);
}
// Analyze temp buffer.
tempFloatBuffer[tempIndex % 3] = totalAbsValue;
float temp = 0.0f;
for (int i = 0; i < 3; ++i)
temp += tempFloatBuffer[i];
if ((temp >= 0 && temp <= 350) && recording == false) {
Log.i("TAG", "1");
tempIndex++;
continue;
}
if (temp > 350 && recording == false) {
Log.i("TAG", "2");
recording = true;
}
if ((temp >= 0 && temp <= 350) && recording == true) {
Log.i("TAG", "Save audio to file.");
// Save audio to file.
String filepath = Environment.getExternalStorageDirectory()
.getPath();
File file = new File(filepath, "AudioRecorder");
if (!file.exists())
file.mkdirs();
String fn = file.getAbsolutePath() + "/"
+ System.currentTimeMillis() + ".wav";
long totalAudioLen = 0;
long totalDataLen = totalAudioLen + 36;
long longSampleRate = RECORDER_SAMPLERATE;
int channels = 1;
long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels
/ 8;
totalAudioLen = totalReadBytes;
totalDataLen = totalAudioLen + 36;
byte finalBuffer[] = new byte[totalReadBytes + 44];
finalBuffer[0] = 'R'; // RIFF/WAVE header
finalBuffer[1] = 'I';
finalBuffer[2] = 'F';
finalBuffer[3] = 'F';
finalBuffer[4] = (byte) (totalDataLen & 0xff);
finalBuffer[5] = (byte) ((totalDataLen >> 8) & 0xff);
finalBuffer[6] = (byte) ((totalDataLen >> 16) & 0xff);
finalBuffer[7] = (byte) ((totalDataLen >> 24) & 0xff);
finalBuffer[8] = 'W';
finalBuffer[9] = 'A';
finalBuffer[10] = 'V';
finalBuffer[11] = 'E';
finalBuffer[12] = 'f'; // 'fmt ' chunk
finalBuffer[13] = 'm';
finalBuffer[14] = 't';
finalBuffer[15] = ' ';
finalBuffer[16] = 16; // 4 bytes: size of 'fmt ' chunk
finalBuffer[17] = 0;
finalBuffer[18] = 0;
finalBuffer[19] = 0;
finalBuffer[20] = 1; // format = 1
finalBuffer[21] = 0;
finalBuffer[22] = (byte) channels;
finalBuffer[23] = 0;
finalBuffer[24] = (byte) (longSampleRate & 0xff);
finalBuffer[25] = (byte) ((longSampleRate >> 8) & 0xff);
finalBuffer[26] = (byte) ((longSampleRate >> 16) & 0xff);
finalBuffer[27] = (byte) ((longSampleRate >> 24) & 0xff);
finalBuffer[28] = (byte) (byteRate & 0xff);
finalBuffer[29] = (byte) ((byteRate >> 8) & 0xff);
finalBuffer[30] = (byte) ((byteRate >> 16) & 0xff);
finalBuffer[31] = (byte) ((byteRate >> 24) & 0xff);
finalBuffer[32] = (byte) (2 * 16 / 8); // block align
finalBuffer[33] = 0;
finalBuffer[34] = RECORDER_BPP; // bits per sample
finalBuffer[35] = 0;
finalBuffer[36] = 'd';
finalBuffer[37] = 'a';
finalBuffer[38] = 't';
finalBuffer[39] = 'a';
finalBuffer[40] = (byte) (totalAudioLen & 0xff);
finalBuffer[41] = (byte) ((totalAudioLen >> 8) & 0xff);
finalBuffer[42] = (byte) ((totalAudioLen >> 16) & 0xff);
finalBuffer[43] = (byte) ((totalAudioLen >> 24) & 0xff);
for (int i = 0; i < totalReadBytes; ++i)
finalBuffer[44 + i] = totalByteBuffer[i];
FileOutputStream out;
try {
out = new FileOutputStream(fn);
try {
out.write(finalBuffer);
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
// */
tempIndex++;
break;
}
// -> Recording sound here.
Log.i("TAG", "Recording Sound.");
for (int i = 0; i < numberOfReadBytes; i++)
totalByteBuffer[totalReadBytes + i] = audioBuffer[i];
totalReadBytes += numberOfReadBytes;
// */
tempIndex++;
}
}
最佳答案
我不喜欢你编写代码的方式。 用我的。 您可以根据您的音量更改阈值变量。 在此示例应用程序中没有按钮。当您启动该应用程序时，它开始收听，当您按下后退按钮时，采集停止并且文件存储在手机内存中的 AudioRecorder 文件夹中，每次运行时都会有一个新文件。 甚至阅读评论和注释代码。 注意:每次语音超过阈值时，语音都会附加到一个临时文件中。 当您通过按返回手动停止录制时添加 wav header (wav 文件是从临时文件创建的，具有新的唯一名称)。 如果每次显示语音都需要新建一个文件，可以根据自己的需要轻松修改，但一定要通过临时文件保存。 如果你需要某种延迟，为了录制更多，即使没有声音(在声音之后)，只要在你的延迟结束时继续保存数据。您可以创建延迟，计算自上次找到峰值(表示语音存在)以来耗时 (System.nanotime)。
不要忘记标记已接受的解决方案(我测试过)。
package com.example.testaudiocapturewiththreshold;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.AsyncTask;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;
public class TestAudioCaptureWithThreshold extends Activity {
private static final String TAG = TestAudioCaptureWithThreshold.class.getSimpleName();
private static final int RECORDER_BPP = 16;
private static final String AUDIO_RECORDER_FILE_EXT_WAV = ".wav";
private static final String AUDIO_RECORDER_FOLDER = "AudioRecorder";
private static final String AUDIO_RECORDER_TEMP_FILE = "record_temp.raw";
FileOutputStream os = null;
int bufferSize ;
int frequency = 44100; //8000;
int channelConfiguration = AudioFormat.CHANNEL_IN_MONO;
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
boolean started = false;
RecordAudio recordTask;
short threshold=15000;
boolean debug=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.w(TAG, "onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test_audio_capture_with_threshold);
startAquisition();
}
@Override
protected void onResume() {
Log.w(TAG, "onResume");
super.onResume();
}
@Override
protected void onDestroy() {
Log.w(TAG, "onDestroy");
stopAquisition();
super.onDestroy();
}
public class RecordAudio extends AsyncTask<Void, Double, Void> {
@Override
protected Void doInBackground(Void... arg0) {
Log.w(TAG, "doInBackground");
try {
String filename = getTempFilename();
try {
os = new FileOutputStream(filename);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
bufferSize = AudioRecord.getMinBufferSize(frequency,
channelConfiguration, audioEncoding);
AudioRecord audioRecord = new AudioRecord( MediaRecorder.AudioSource.MIC, frequency,
channelConfiguration, audioEncoding, bufferSize);
short[] buffer = new short[bufferSize];
audioRecord.startRecording();
while (started) {
int bufferReadResult = audioRecord.read(buffer, 0,bufferSize);
if(AudioRecord.ERROR_INVALID_OPERATION != bufferReadResult){
//check signal
//put a threshold
int foundPeak=searchThreshold(buffer,threshold);
if (foundPeak>-1){ //found signal
//record signal
byte[] byteBuffer =ShortToByte(buffer,bufferReadResult);
try {
os.write(byteBuffer);
} catch (IOException e) {
e.printStackTrace();
}
}else{//count the time
//don't save signal
}
//show results
//here, with publichProgress function, if you calculate the total saved samples,
//you can optionally show the recorded file length in seconds: publishProgress(elsapsedTime,0);
}
}
audioRecord.stop();
//close file
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
copyWaveFile(getTempFilename(),getFilename());
deleteTempFile();
} catch (Throwable t) {
t.printStackTrace();
Log.e("AudioRecord", "Recording Failed");
}
return null;
} //fine di doInBackground
byte [] ShortToByte(short [] input, int elements) {
int short_index, byte_index;
int iterations = elements; //input.length;
byte [] buffer = new byte[iterations * 2];
short_index = byte_index = 0;
for(/*NOP*/; short_index != iterations; /*NOP*/)
{
buffer[byte_index] = (byte) (input[short_index] & 0x00FF);
buffer[byte_index + 1] = (byte) ((input[short_index] & 0xFF00) >> 8);
++short_index; byte_index += 2;
}
return buffer;
}
int searchThreshold(short[]arr,short thr){
int peakIndex;
int arrLen=arr.length;
for (peakIndex=0;peakIndex<arrLen;peakIndex++){
if ((arr[peakIndex]>=thr) || (arr[peakIndex]<=-thr)){
//se supera la soglia, esci e ritorna peakindex-mezzo kernel.
return peakIndex;
}
}
return -1; //not found
}
/*
@Override
protected void onProgressUpdate(Double... values) {
DecimalFormat sf = new DecimalFormat("000.0000");
elapsedTimeTxt.setText(sf.format(values[0]));
}
*/
private String getFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
return (file.getAbsolutePath() + "/" + System.currentTimeMillis() + AUDIO_RECORDER_FILE_EXT_WAV);
}
private String getTempFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,AUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE);
if(tempFile.exists())
tempFile.delete();
return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);
}
private void deleteTempFile() {
File file = new File(getTempFilename());
file.delete();
}
private void copyWaveFile(String inFilename,String outFilename){
FileInputStream in = null;
FileOutputStream out = null;
long totalAudioLen = 0;
long totalDataLen = totalAudioLen + 36;
long longSampleRate = frequency;
int channels = 1;
long byteRate = RECORDER_BPP * frequency * channels/8;
byte[] data = new byte[bufferSize];
try {
in = new FileInputStream(inFilename);
out = new FileOutputStream(outFilename);
totalAudioLen = in.getChannel().size();
totalDataLen = totalAudioLen + 36;
WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
longSampleRate, channels, byteRate);
while(in.read(data) != -1){
out.write(data);
}
in.close();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private void WriteWaveFileHeader(
FileOutputStream out, long totalAudioLen,
long totalDataLen, long longSampleRate, int channels,
long byteRate) throws IOException {
byte[] header = new byte[44];
header[0] = 'R'; // RIFF/WAVE header
header[1] = 'I';
header[2] = 'F';
header[3] = 'F';
header[4] = (byte) (totalDataLen & 0xff);
header[5] = (byte) ((totalDataLen >> 8) & 0xff);
header[6] = (byte) ((totalDataLen >> 16) & 0xff);
header[7] = (byte) ((totalDataLen >> 24) & 0xff);
header[8] = 'W';
header[9] = 'A';
header[10] = 'V';
header[11] = 'E';
header[12] = 'f'; // 'fmt ' chunk
header[13] = 'm';
header[14] = 't';
header[15] = ' ';
header[16] = 16; // 4 bytes: size of 'fmt ' chunk
header[17] = 0;
header[18] = 0;
header[19] = 0;
header[20] = 1; // format = 1
header[21] = 0;
header[22] = (byte) channels;
header[23] = 0;
header[24] = (byte) (longSampleRate & 0xff);
header[25] = (byte) ((longSampleRate >> 8) & 0xff);
header[26] = (byte) ((longSampleRate >> 16) & 0xff);
header[27] = (byte) ((longSampleRate >> 24) & 0xff);
header[28] = (byte) (byteRate & 0xff);
header[29] = (byte) ((byteRate >> 8) & 0xff);
header[30] = (byte) ((byteRate >> 16) & 0xff);
header[31] = (byte) ((byteRate >> 24) & 0xff);
header[32] = (byte) (channels * 16 / 8); // block align
header[33] = 0;
header[34] = RECORDER_BPP; // bits per sample
header[35] = 0;
header[36] = 'd';
header[37] = 'a';
header[38] = 't';
header[39] = 'a';
header[40] = (byte) (totalAudioLen & 0xff);
header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
header[43] = (byte) ((totalAudioLen >> 24) & 0xff);
out.write(header, 0, 44);
}
} //Fine Classe RecordAudio (AsyncTask)
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.test_audio_capture_with_threshold,
menu);
return true;
}
public void resetAquisition() {
Log.w(TAG, "resetAquisition");
stopAquisition();
//startButton.setText("WAIT");
startAquisition();
}
public void stopAquisition() {
Log.w(TAG, "stopAquisition");
if (started) {
started = false;
recordTask.cancel(true);
}
}
public void startAquisition(){
Log.w(TAG, "startAquisition");
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
//elapsedTime=0;
started = true;
recordTask = new RecordAudio();
recordTask.execute();
//startButton.setText("RESET");
}
}, 500);
}
}
不要忘记为 list 文件添加权限:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.testaudiocapturewiththreshold"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.testaudiocapturewiththreshold.TestAudioCaptureWithThreshold"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
关于java - Android 音频采集静音检测，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19145213/