javax.sound.sampled.Clip#setFramePosition ( )源码实例Demo

public void update(LineEvent event) {
    // �X�g�b�v���Ō�܂ōĐ����ꂽ�ꍇ
    if (event.getType() == LineEvent.Type.STOP) {
        Clip clip = (Clip) event.getSource();
        clip.stop();
        clip.setFramePosition(0); // �Đ��ʒu���ŏ��ɖ߂�
    }
}
 

public void update(LineEvent event) {
    // �X�g�b�v���Ō�܂ōĐ����ꂽ�ꍇ
    if (event.getType() == LineEvent.Type.STOP) {
        Clip clip = (Clip) event.getSource();
        clip.stop();
        clip.setFramePosition(0); // �Đ��ʒu���ŏ��ɖ߂�
    }
}
 

public static void main(String args[]) throws Exception {
    boolean res = true;
    try {
        AudioInputStream ais = new AudioInputStream(
                new ByteArrayInputStream(new byte[2000]),
                new AudioFormat(8000.0f, 8, 1, false, false), 2000); //
        AudioFormat format = ais.getFormat();
        DataLine.Info info = new DataLine.Info(Clip.class, format,
                                               ((int) ais.getFrameLength()
                                                        * format
                                                       .getFrameSize()));
        Clip clip = (Clip) AudioSystem.getLine(info);
        clip.open();
        FloatControl rateControl = (FloatControl) clip.getControl(
                FloatControl.Type.SAMPLE_RATE);
        int c = 0;
        while (c++ < 10) {
            clip.stop();
            clip.setFramePosition(0);
            clip.start();
            for (float frq = 22000; frq < 44100; frq = frq + 100) {
                try {
                    Thread.currentThread().sleep(20);
                } catch (Exception e) {
                    break;
                }
                rateControl.setValue(frq);
            }
        }
    } catch (Exception ex) {
        ex.printStackTrace();
        res = ex.getMessage().indexOf(
                "This method should not have been invoked!") < 0;
    }
    if (res) {
        System.out.println("Test passed");
    } else {
        System.out.println("Test failed");
        throw new Exception("Test failed");
    }
}
 

/**
 * Plays the clip with the specified volume.
 * @param volume the volume the play at
 * @param listener the line listener
 * @throws LineUnavailableException if a clip object is not available or
 *         if the line cannot be opened due to resource restrictions
 */
public void start(float volume, LineListener listener) throws LineUnavailableException {
	Clip clip = getClip();
	if (clip == null)
		return;

	// PulseAudio does not support Master Gain
	if (clip.isControlSupported(FloatControl.Type.MASTER_GAIN)) {
		// set volume
		FloatControl gainControl = (FloatControl) clip.getControl(FloatControl.Type.MASTER_GAIN);
		float dB = (float) (Math.log(volume) / Math.log(10.0) * 20.0);
		gainControl.setValue(dB);
	}

	if (listener != null)
		clip.addLineListener(listener);
	clip.setFramePosition(0);
	clip.start();
}
 

/**
 * Playback
 * @param name Registered name
 */
public void play(String name) {
	Clip clip = clipMap.get(name);

	if(clip != null) {
		// Stop
		clip.stop();
		// Playback position back to the beginning
		clip.setFramePosition(0);
		// Playback
		clip.start();
	}
}
 

public void update(LineEvent event) {
	// If you stop playback or to the end
	if(event.getType() == LineEvent.Type.STOP) {
		Clip clip = (Clip) event.getSource();
		clip.stop();
		clip.setFramePosition(0); // Playback position back to the beginning
	}
}
 

/**
 * Plays the clip with the specified volume.
 * @param volume the volume the play at
 * @param listener the line listener
 * @throws LineUnavailableException if a clip object is not available or
 *         if the line cannot be opened due to resource restrictions
 */
public void start(float volume, LineListener listener) throws LineUnavailableException {
	Clip clip = getClip();
	if (clip == null)
		return;

	// PulseAudio does not support Master Gain
	if (clip.isControlSupported(FloatControl.Type.MASTER_GAIN)) {
		// set volume
		FloatControl gainControl = (FloatControl) clip.getControl(FloatControl.Type.MASTER_GAIN);
		float dB = (float) (Math.log(volume) / Math.log(10.0) * 20.0);
		gainControl.setValue(Utils.clamp(dB, gainControl.getMinimum(), gainControl.getMaximum()));
	} else if (clip.isControlSupported(FloatControl.Type.VOLUME)) {
		// The docs don't mention what unit "volume" is supposed to be,
		// but for PulseAudio it seems to be amplitude
		FloatControl volumeControl = (FloatControl) clip.getControl(FloatControl.Type.VOLUME);
		float amplitude = (float) Math.sqrt(volume) * volumeControl.getMaximum();
		volumeControl.setValue(Utils.clamp(amplitude, volumeControl.getMinimum(), volumeControl.getMaximum()));
	}

	if (listener != null)
		clip.addLineListener(listener);
	clip.setFramePosition(0);
	clip.start();
}
 

public void update(LineEvent event) {
    // �X�g�b�v���Ō�܂ōĐ����ꂽ�ꍇ
    if (event.getType() == LineEvent.Type.STOP) {
        Clip clip = (Clip) event.getSource();
        clip.stop();
        clip.setFramePosition(0); // �Đ��ʒu���ŏ��ɖ߂�
    }
}
 

public void update(LineEvent event) {
    // �X�g�b�v���Ō�܂ōĐ����ꂽ�ꍇ
    if (event.getType() == LineEvent.Type.STOP) {
        Clip clip = (Clip) event.getSource();
        clip.stop();
        clip.setFramePosition(0); // �Đ��ʒu���ŏ��ɖ߂�
    }
}
 

public void update(LineEvent event) {
    // �X�g�b�v���Ō�܂ōĐ����ꂽ�ꍇ
    if (event.getType() == LineEvent.Type.STOP) {
        Clip clip = (Clip) event.getSource();
        clip.stop();
        clip.setFramePosition(0); // �Đ��ʒu���ŏ��ɖ߂�
    }
}
 

public void update(LineEvent event) {
    // �X�g�b�v���Ō�܂ōĐ����ꂽ�ꍇ
    if (event.getType() == LineEvent.Type.STOP) {
        Clip clip = (Clip) event.getSource();
        clip.stop();
        clip.setFramePosition(0); // �Đ��ʒu���ŏ��ɖ߂�
    }
}
 

public void play() {
	try {
		final Clip clipToPlay;
		if (preLoadedClip != null) {
			clipToPlay = preLoadedClip;
			clipToPlay.setFramePosition(0);
		} else {
			clipToPlay = openClip(CLOSE_AFTER_PLAYING);
		}
		clipToPlay.start();

	} catch (IOException | LineUnavailableException | UnsupportedAudioFileException e) {
		throw new IllegalStateException(e);
	}
}
 

static protected void test()
        throws LineUnavailableException, InterruptedException {
    DataLine.Info info = new DataLine.Info(Clip.class, format);
    Clip clip = (Clip)AudioSystem.getLine(info);
    final MutableBoolean clipStoppedEvent = new MutableBoolean(false);
    clip.addLineListener(new LineListener() {
        @Override
        public void update(LineEvent event) {
            if (event.getType() == LineEvent.Type.STOP) {
                synchronized (clipStoppedEvent) {
                    clipStoppedEvent.value = true;
                    clipStoppedEvent.notifyAll();
                }
            }
        }
    });
    clip.open(format, soundData, 0, soundData.length);

    long lengthClip = clip.getMicrosecondLength() / 1000;
    log("Clip length " + lengthClip + " ms");
    log("Playing...");
    for (int i=1; i<=LOOP_COUNT; i++) {
        long startTime = currentTimeMillis();
        log(" Loop " + i);
        clip.start();

        synchronized (clipStoppedEvent) {
            while (!clipStoppedEvent.value) {
                clipStoppedEvent.wait();
            }
            clipStoppedEvent.value = false;
        }

        long endTime = currentTimeMillis();
        long lengthPlayed = endTime - startTime;

        if (lengthClip > lengthPlayed + 20) {
            log(" ERR: Looks like sound didn't play: played " + lengthPlayed + " ms instead " + lengthClip);
            countErrors++;
        } else {
            log(" OK: played " + lengthPlayed + " ms");
        }
        clip.setFramePosition(0);

    }
    log("Played " + LOOP_COUNT + " times, " + countErrors + " errors detected.");
}