下面列出了javax.sound.sampled.SourceDataLine#drain ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
public static void rawplay(AudioFormat targetFormat, AudioInputStream din)
throws IOException, LineUnavailableException {
byte[] data = new byte[CommonValues.IOBufferLength];
DataLine.Info info = new DataLine.Info(SourceDataLine.class, targetFormat);
SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info);
line.open(targetFormat);
if (line != null) {
// Start
FloatControl vol = (FloatControl) line.getControl(FloatControl.Type.MASTER_GAIN);
logger.debug(vol.getValue() + vol.getUnits());
line.start();
int nBytesRead = 0, nBytesWritten = 0;
while (nBytesRead != -1) {
nBytesRead = din.read(data, 0, data.length);
if (nBytesRead != -1) {
nBytesWritten = line.write(data, 0, nBytesRead);
}
}
// Stop
line.drain();
line.stop();
line.close();
din.close();
}
}
public static void tone(int hz, int msecs, double vol) throws LineUnavailableException {
byte[] buf = new byte[1];
AudioFormat af = new AudioFormat(SAMPLE_RATE, // sampleRate
8, // sampleSizeInBits
1, // channels
true, // signed
false); // bigEndian
SourceDataLine sdl = AudioSystem.getSourceDataLine(af);
sdl.open(af);
sdl.start();
for (int i = 0; i < msecs * 8; i++) {
double angle = i / (SAMPLE_RATE / hz) * 2.0 * Math.PI;
buf[0] = (byte) (Math.sin(angle) * 127.0 * vol);
sdl.write(buf, 0, 1);
}
sdl.drain();
sdl.stop();
sdl.close();
}
public static void tone(int hz, int msecs, double vol) throws LineUnavailableException {
byte[] buf = new byte[1];
AudioFormat af = new AudioFormat(SAMPLE_RATE, // sampleRate
8, // sampleSizeInBits
1, // channels
true, // signed
false); // bigEndian
SourceDataLine sdl = AudioSystem.getSourceDataLine(af);
sdl.open(af);
sdl.start();
for (int i = 0; i < msecs * 8; i++) {
double angle = i / (SAMPLE_RATE / hz) * 2.0 * Math.PI;
buf[0] = (byte) (Math.sin(angle) * 127.0 * vol);
sdl.write(buf, 0, 1);
}
sdl.drain();
sdl.stop();
sdl.close();
}
void playRecorded(AudioFormat format, byte[] data) throws Exception {
//SourceDataLine line = AudioSystem.getSourceDataLine(format);
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
SourceDataLine line = (SourceDataLine)AudioSystem.getLine(info);
line.open();
line.start();
int remaining = data.length;
while (remaining > 0) {
int avail = line.available();
if (avail > 0) {
if (avail > remaining)
avail = remaining;
int written = line.write(data, data.length - remaining, avail);
remaining -= written;
log("Playing: " + written + " bytes written");
} else {
delay(100);
}
}
line.drain();
line.stop();
}
private void rawplay(AudioFormat targetFormat, AudioInputStream din) throws IOException, LineUnavailableException
{
byte[] data = new byte[4096];
SourceDataLine line = getLine(targetFormat);
if (line != null)
{
// Start
line.start();
int nBytesRead = 0, nBytesWritten = 0;
while (nBytesRead != -1)
{
nBytesRead = din.read(data, 0, data.length);
if (nBytesRead != -1) nBytesWritten = line.write(data, 0, nBytesRead);
}
// Stop
line.drain();
line.stop();
line.close();
din.close();
}
}
private static void rawplay(AudioFormat targetFormat,
AudioInputStream din) throws IOException, LineUnavailableException
{
byte[] data = new byte[4096];
SourceDataLine line = getLine(targetFormat);
if (line != null)
{
// Start
line.start();
int nBytesRead = 0, nBytesWritten = 0;
while (nBytesRead != -1)
{
nBytesRead = din.read(data, 0, data.length);
if (nBytesRead != -1) nBytesWritten = line.write(data, 0, nBytesRead);
}
// Stop
line.drain();
line.stop();
line.close();
din.close();
}
}
public void play(byte[] sound) throws AudioException {
try {
AudioFormat format = AudioUtil.getAudioFormat(audioConf);
DataLine.Info dataLineInfo = new DataLine.Info(SourceDataLine.class, format);
SourceDataLine speakers = (SourceDataLine) AudioSystem.getLine(dataLineInfo);
speakers.open(format);
speakers.start();
speakers.write(sound, 0, sound.length);
speakers.drain();
speakers.close();
} catch (Exception e) {
throw new AudioException("Unable to play the response", e);
}
}
/**
* Play a sound.
*
* @param sound The {@code File} to play.
* @return True if the sound was played without incident.
* @exception IOException if unable to read or write the sound data.
*/
private boolean playSound(File sound) throws IOException {
boolean ret = false;
try (AudioInputStream in = getAudioInputStream(sound)) {
SourceDataLine line = openLine(in.getFormat(), getMixer(),
data.length);
if (line == null) return false;
changeVolume(line, getVolume());
try {
this.playDone = false;
int rd;
while (!this.playDone && (rd = in.read(data)) > 0) {
line.write(data, 0, rd);
}
ret = true;
//logger.finest("Played " + sound);
} finally {
this.playDone = true;
line.drain();
line.stop();
line.close();
}
} catch (IOException ioe) {
logger.log(Level.WARNING, "Can not open "
+ sound + " as audio stream", ioe);
return false;
}
return ret;
}
private static boolean doMixerSDL(Mixer mixer, AudioFormat format) {
if (mixer==null) return false;
try {
System.out.println("Trying mixer "+mixer+":");
DataLine.Info info = new DataLine.Info(
SourceDataLine.class,
format,
(int) samplerate);
SourceDataLine sdl = (SourceDataLine) mixer.getLine(info);
System.out.println(" - got sdl: "+sdl);
System.out.println(" - open with format "+format);
sdl.open(format);
System.out.println(" - start...");
sdl.start();
System.out.println(" - write...");
sdl.write(buffer, 0, buffer.length);
Thread.sleep(200);
System.out.println(" - drain...");
sdl.drain();
System.out.println(" - stop...");
sdl.stop();
System.out.println(" - close...");
sdl.close();
System.out.println(" - closed");
} catch (Throwable t) {
System.out.println(" - Caught exception. Not failed.");
System.out.println(" - "+t.toString());
return false;
}
return true;
}
public static int play(boolean shouldPlay) {
int res = 0;
DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
try {
println("Getting line from mixer...");
source = (SourceDataLine) mixer.getLine(info);
println("Opening line...");
println(" -- if the program is hanging here, kill the process that has blocks the audio device now.");
source.open(audioFormat);
println("Starting line...");
source.start();
println("Writing audio data for 1 second...");
long startTime = System.currentTimeMillis();
while (System.currentTimeMillis() - startTime < 1000) {
writeData();
Thread.sleep(100);
}
res = 1;
} catch (IllegalArgumentException iae) {
println("IllegalArgumentException: "+iae.getMessage());
println("Sound device cannot handle this audio format.");
println("ERROR: Test environment not correctly set up.");
if (source!=null) {
source.close();
}
return 3;
} catch (LineUnavailableException lue) {
println("LineUnavailableException: "+lue.getMessage());
if (shouldPlay) {
println("ERROR: the line should be available now!.");
println(" Verify that you killed the other audio process.");
} else {
println("Correct behavior! the bug is fixed.");
}
res = 2;
} catch (Exception e) {
println("Unexpected Exception: "+e.toString());
}
if (source != null) {
println("Draining...");
try {
source.drain();
} catch (NullPointerException npe) {
println("(NullPointerException: bug fixed in J2SE 1.4.2");
}
println("Stopping...");
source.stop();
println("Closing...");
source.close();
source = null;
}
return res;
}
public static void main(String[] args) throws Exception {
System.out.println("This test should only be run on Windows.");
System.out.println("Make sure that the speakers are connected and the volume is up.");
System.out.println("Close all other programs that may use the soundcard.");
System.out.println("You'll hear a 2-second tone. when the tone finishes,");
System.out.println(" there should be no noise. If you hear a short tick/noise,");
System.out.println(" the bug still applies.");
System.out.println("Press ENTER to continue.");
System.in.read();
for (int i = 0; i < args.length; i++) {
if (args[i].equals("1")) WorkAround1 = true;
if (args[i].equals("2")) WorkAround2 = true;
}
if (WorkAround1) System.out.println("Using work around1: appending silence");
if (WorkAround2) System.out.println("Using work around2: waiting before close");
int zerolen = 0; // how many 0-bytes will be appended to playback
if (WorkAround1) zerolen = 1000;
int seconds = 2;
int sampleRate = 8000;
double frequency = 1000.0;
double RAD = 2.0 * Math.PI;
AudioFormat af = new AudioFormat((float)sampleRate,8,1,true,true);
System.out.println("Format: "+af);
DataLine.Info info = new DataLine.Info(SourceDataLine.class,af);
SourceDataLine source = (SourceDataLine)AudioSystem.getLine(info);
System.out.println("Line: "+source);
if (source.toString().indexOf("MixerSourceLine")>=0) {
System.out.println("This test only applies to non-Java Sound Audio Engine!");
return;
}
System.out.println("Opening...");
source.open(af);
System.out.println("Starting...");
source.start();
int datalen = sampleRate * seconds;
byte[] buf = new byte[datalen+zerolen];
for (int i=0; i<datalen; i++) {
buf[i] = (byte)(Math.sin(RAD*frequency/sampleRate*i)*127.0);
}
System.out.println("Writing...");
source.write(buf,0,buf.length);
System.out.println("Draining...");
source.drain();
System.out.println("Stopping...");
source.stop();
if (WorkAround2) {
System.out.println("Waiting 200 millis...");
Thread.sleep(200);
}
System.out.println("Closing...");
source.close();
System.out.println("Done.");
}