声音的流式播放
站点：爱心种子小博士 关键字：声音的流式播放
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声音的流式播放
基本原理：将声音文件中的数据分段读入一字节数组，反复读取与播放。
import java.io.*;
import javax.sound.sampled.*;
/**
The SimpleSoundPlayer encapsulates a sound that can be opened
from the file system and later played.
*/
public class SimpleSoundPlayer {
public static void main(String[] args) {
// load a sound
SimpleSoundPlayer sound = new SimpleSoundPlayer("sounds/voice.wav");
// create the stream to play
InputStream stream =new ByteArrayInputStream(sound.getSamples());
// play the sound
sound.play(stream);
// exit
System.exit(0);
}
private AudioFormat format;
private byte[] samples;
/**
Opens a sound from a file.
*/
public SimpleSoundPlayer(String filename) {
try {
// open the audio input stream
AudioInputStream stream =
AudioSystem.getAudioInputStream(
new File(filename));
format = stream.getFormat();
// get the audio samples
samples = getSamples(stream);
}
catch (UnsupportedAudioFileException ex) {
ex.printStackTrace();
}
catch (IOException ex) {
ex.printStackTrace();
}
}
/**
Gets the samples of this sound as a byte array.
*/
public byte[] getSamples() {
return samples;
}
/**
Gets the samples from an AudioInputStream as an array
of bytes.
*/
private byte[] getSamples(AudioInputStream audioStream) {
// get the number of bytes to read
int length = (int)(audioStream.getFrameLength() *
format.getFrameSize());
// read the entire stream
byte[] samples = new byte[length];
DataInputStream is = new DataInputStream(audioStream);
try {
is.readFully(samples);
}
catch (IOException ex) {
ex.printStackTrace();
}
// return the samples
return samples;
}
/**
Plays a stream. This method blocks (doesnt return) until
the sound is finished playing.
*/
public void play(InputStream source) {
// use a short, 100ms (1/10th sec) buffer for real-time
// change to the sound stream
int bufferSize = format.getFrameSize() *
Math.round(format.getSampleRate() / 10);
byte[] buffer = new byte[bufferSize];
// create a line to play to
SourceDataLine line;
try {
DataLine.Info info =
new DataLine.Info(SourceDataLine.class, format);
line = (SourceDataLine)AudioSystem.getLine(info);
line.open(format, bufferSize);
}
catch (LineUnavailableException ex) {
ex.printStackTrace();
return;
}
// start the line
line.start();
// copy data to the line
try {
int numBytesRead = 0;
while (numBytesRead != -1) {
numBytesRead =
source.read(buffer, 0, buffer.length);
if (numBytesRead != -1) {
line.write(buffer, 0, numBytesRead);
}
}
}
catch (IOException ex) {
ex.printStackTrace();
}
// wait until all data is played, then close the line
line.drain();
line.close();
}
} |
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