MP3Encoder.java
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package cn.org.hentai.jtt1078.codec;
import de.sciss.jump3r.lowlevel.LameEncoder;
import de.sciss.jump3r.mp3.Lame;
import javax.sound.sampled.AudioFormat;
import java.io.ByteArrayOutputStream;
/**
* Created by matrixy on 2020/4/27.
*/
public class MP3Encoder
{
static final AudioFormat PCM_FORMAT = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 8000, 16, 1, 1 * 2, -1, false);
byte[] buffer = null;
ByteArrayOutputStream mp3Data;
LameEncoder encoder = null;
public MP3Encoder()
{
encoder = new LameEncoder(PCM_FORMAT, 256, 3, Lame.MEDIUM, false);
buffer = new byte[encoder.getPCMBufferSize()];
mp3Data = new ByteArrayOutputStream(encoder.getOutputBufferSize());
}
public byte[] encode(byte[] pcm)
{
if (pcm == null) return null;
int bytesToTransfer = Math.min(encoder.getPCMBufferSize(), pcm.length);
int bytesWritten;
int currentPcmPosition = 0;
mp3Data.reset();
while (0 < (bytesWritten = encoder.encodeBuffer(pcm, currentPcmPosition, bytesToTransfer, buffer)))
{
currentPcmPosition += bytesToTransfer;
bytesToTransfer = Math.min(buffer.length, pcm.length - currentPcmPosition);
mp3Data.write(buffer, 0, bytesWritten);
}
return mp3Data.toByteArray();
}
public void close()
{
encoder.close();
}
}