录音机中的暂停功能
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【中文标题】录音机中的暂停功能【英文标题】：Pause function in Audio Recorder 【发布时间】：2016-06-24 15:30:31 【问题描述】：我想为我的录音机实现暂停和恢复功能。我知道我不能使用 MediaRecorder 来做到这一点。 所以请给我一个可以加入两个AAC音频文件的类的源代码。
【问题讨论】：
MediaMuxer 可能。 How to Pause and Resume Audio recording in android的可能重复 使用字节 API，将 Audio2.aac 的字节连接到 Audio1.aac 的末尾会发生什么。 AAC 的本质是将其分解为帧，因此要添加更多帧，您只需在末尾添加更多字节（字节是其他 AAC 帧） 你能举个例子吗？ 【参考方案1】：MediaRecorder 从 API 级别 24 添加了暂停功能。如果您的 minSdkVersion 小于 24，您可以使用下面的代码。它是从 this page 中提取的。录制停止后，它会以给定的名称生成一个波形文件。
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
public class RecordAudio extends AppCompatActivity
private static final int RECORDER_BPP = 16;
private static final int RECORDER_SAMPLE_RATE = 8000;
private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_STEREO;
private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private Button recordButton, stopButton, pauseButton, resumeButton;
private EditText recordingName;
private AudioRecord recorder = null;
private int bufferSize = 0;
private Thread recordingThread = null;
private boolean isRecording = false;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_record_audio);
bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLE_RATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
recordButton = (Button) findViewById(R.id.record_button);
stopButton = (Button) findViewById(R.id.stop_button);
pauseButton = (Button) findViewById(R.id.pause_button);
resumeButton = (Button) findViewById(R.id.resume_button);
recordingName = (EditText) findViewById(R.id.recording_name);
recordButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
startRecording(false);
);
pauseButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
stopRecording(false);
);
resumeButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
startRecording(true);
);
stopButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
stopRecording(true);
);
private void startRecording(final boolean b)
recorder = new AudioRecord(MediaRecorder.Audiosource.MIC, RECORDER_SAMPLE_RATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSize);
recorder.startRecording();
isRecording = true;
recordingThread = new Thread(new Runnable()
@Override
public void run()
writeAudioDataToFile(b);
, "AudioRecorder Thread");
recordingThread.start();
private void writeAudioDataToFile(boolean b)
byte data[] = new byte[bufferSize];
String filename = getTempFilename();
FileOutputStream os = null;
try
os = new FileOutputStream(filename, b);
catch (FileNotFoundException e)
e.printStackTrace();
int read = 0;
if (os != null)
while (isRecording)
read = recorder.read(data, 0, bufferSize);
if (AudioRecord.ERROR_INVALID_OPERATION != read)
try
os.write(data);
catch (IOException e)
e.printStackTrace();
try
os.close();
catch (IOException e)
e.printStackTrace();
private String getTempFilename()
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath + "/recording_temp.raw");
try
file.createNewFile();
catch (IOException e)
e.printStackTrace();
return (file.getAbsolutePath());
private void stopRecording(boolean b)
if (recorder != null)
isRecording = false;
recorder.stop();
recorder.release();
recorder = null;
recordingThread = null;
if (b == true)
copyWaveFile(getTempFilename(), getFilename());
deleteTempFile();
private void copyWaveFile(String inFilename, String outFilename)
FileInputStream in = null;
FileOutputStream out = null;
long totalAudioLen = 0;
long totalDataLen = totalAudioLen + 44;
long longSampleRate = RECORDER_SAMPLE_RATE;
int channels = 2;
long byteRate = RECORDER_BPP * RECORDER_SAMPLE_RATE * channels / 8;
byte[] data = new byte[bufferSize];
try
in = new FileInputStream(inFilename);
out = new FileOutputStream(outFilename, true);
totalAudioLen = in.getChannel().size() + out.getChannel().size();
totalDataLen = totalAudioLen + 44;
WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
longSampleRate, channels, byteRate, outFilename);
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, String outFileName) 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) (2 * 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);
RandomAccessFile rFile = new RandomAccessFile(outFileName, "rw");
rFile.seek(0);
rFile.write(header, 0, 44);
rFile.close();
private String getFilename()
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath + "/record_" + recordingName.getText() + ".wav");
try
file.createNewFile();
catch (IOException e)
e.printStackTrace();
return (file.getAbsolutePath());
private void deleteTempFile()
File file = new File(getTempFilename());
file.delete();
【讨论】：
我认为它正在录制。但是，音频不工作。以上是关于录音机中的暂停功能的主要内容，如果未能解决你的问题，请参考以下文章