Hi,
does it access via OSS API?
could you try stace to check what gets into sleep?
Takashi
At Sun, 02 Nov 2003 23:12:05 +0100,
Steffen Sauder wrote:
>
> [1 <text/plain; ISO-8859-1 (7bit)>]
> Hello,
>
> I am working on an audio-application with java 1.4, and I noticed that
> with the current alsa-release the time neccessary to initialize my
> Terratec DMX6fire card for playback (in oss emulation mode) increased a
> lot since older versions.
>
> I wrote a small program to measure the time it takes for simply starting
> the playback of a wav/aiff file. I noticed that the 0.9.8 release uses a
> _lot_ more time on the AudioSystem.getMixerInfo() call (which searches
> for all available devices) than older versions. I also noticed that the
> times differ a lot for different JDKs, so here are the results for the
> sun-jdk-1.4.2.01, blackdown-jdk-1.4.1 and ibm-jdk-1.4.1 with the
> different alsa-driver versions.
>
> alsa-driver 0.9.2 - 0.9.3a:
> sun: 3.2- 3.3 sec bdn: 1.9- 2.0 sec ibm: 0.7- 0.8 sec
>
> alsa-driver 0.9.3b - 0.9.7:
> sun: 6.2- 6.3 sec bdn: 13.7-13.8 sec ibm: 3.7- 3.9 sec
>
> alsa-driver 0.9.8:
> sun: 48.0-48.5 sec bdn: 24.7-24.8 sec ibm: 13.7-13.8 sec
>
> alsa-driver cvs-nov-02:
> sun: 20.7-20.9 sec bdn: 24.8-24.9 sec ibm: 13.8-13.9 sec
>
> So things got worse between 0.9.3a and .b (the same moment the
> mplayer-oss-emulation-delay problem occured!) and 0.9.7 and 0.9.8.
> Current CVS version is working a bit better for sun's jdk, but not for
> the others. I did not try different alsa-lib versions (used 0.9.2 all
> the time) - don't know if this would make any difference.
>
> I attached the source code of the small programm, its syntax is:
>
> java AudioTest AUDIOFILE [DEVICE_NO]
>
> where DEVICE_NO is the index of the java-mixer-device to be used (they
> get listed if you start it without the second parameter)
>
> Gruss,
> Steffen
> [2 AudioTest.java <text/plain (7bit)>]
>
> import javax.sound.sampled.*;
> /**
> *
> * @author fali
> */
> public class AudioTest {
>
> /** Creates a new instance of AudioTest */
> public AudioTest() {
> }
>
> private static void playAudioFile(String fileName, int device) throws
> UnsupportedAudioFileException, LineUnavailableException, java.io.IOException {
> long beginTime = System.currentTimeMillis();
>
> System.out.println("checking for available devices on this system...");
> Mixer.Info[] mixerInfos = AudioSystem.getMixerInfo();
> for (int i=0; i<mixerInfos.length; i++) {
> System.out.println(i+"
> "+mixerInfos[i].getName()+"\t"+mixerInfos[i].getVendor());
> }
> System.out.println();
>
> System.out.println("getting mixer device "+mixerInfos[device].getName()+"...");
> Mixer mixer = AudioSystem.getMixer(mixerInfos[device]);
> System.out.println("got mixer device, trying to open it...");
> mixer.open();
> System.out.println("mixer device opened, checking supported lines...");
>
> Line.Info[] supportedLines = mixer.getSourceLineInfo();
> for (int i=0; i<supportedLines.length; i++) {
> System.out.println(supportedLines[i].toString());
> }
> System.out.println();
>
> java.io.File file = new java.io.File(fileName);
> AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file);
> AudioFormat audioFormat = audioInputStream.getFormat();
> System.out.println("audio file opened, format is "+audioFormat.toString());
>
> Line.Info lineInfo = new DataLine.Info(SourceDataLine.class, audioFormat);
> System.out.println("obtaining SourceDataLine for that AudioFormat...");
> SourceDataLine sourceDataLine = (SourceDataLine)mixer.getLine(lineInfo);
> System.out.println("opening SourceDataLine...");
> sourceDataLine.open(audioFormat);
> System.out.println("starting SourceDataLine...");
> sourceDataLine.start();
>
> long endTime = System.currentTimeMillis();
> float seconds = (endTime-beginTime)/1000.0f;
> System.out.println("it took "+seconds+" seconds to start playback.");
>
> byte[] buf = new byte[1024];
> int bytesRead = 0;
> while(bytesRead>=0) {
> bytesRead = audioInputStream.read(buf);
> if (bytesRead>0) {
> sourceDataLine.write(buf, 0, bytesRead);
> }
> }
>
> sourceDataLine.stop();
> sourceDataLine.close();
> audioInputStream.close();
>
> }
>
> public static void main(String[] args) {
> try {
> if (args.length==0) {
> System.err.println("first argument has to be an audio file.");
> System.exit(-1);
> }
> String fileName = args[0];
> int device = 0;
> if (args.length==2) {
> device = Integer.parseInt(args[1]);
> }
> playAudioFile(fileName, device);
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
>
> }
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