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POIs it possible to generate a tone/audio of less than 1 second long? Or cut off player immediately?
 

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  1. POIs it possible to generate a tone/audio of less than 1 second long? Or cut off player immediately?
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    <p>I'm trying to create an app that generates a tone depending on where you touch on the screen (currently the frequency is determined by the y value of the touch point) however I'm not able to generate a tone of less than a second without crashing my app! I took the code from <a href="https://stackoverflow.com/questions/2413426/playing-an-arbitrary-tone-with-android">the answer here</a> and tweaked it to play when i touch the screen, but when I change the duration variable to a value of less than 1 the app crashes! Is it possible to generate a tone of less than 1 second?</p> <p>The only reason I want to create a tone of less than a second is that the audio player does not seem to cut off straight away when i pause or stop the audiotrack. these are my methods for playing and generating the tone:</p> <pre><code>RelativeLayout background; SoundPool soundPool; TextView textView; private final float duration = 1f; // seconds private final int sampleRate = 8000;//was 8000 private final int numSamples = (int) duration * sampleRate; private final double sample[] = new double[numSamples]; private final double freqOfTone = 250; // hz AudioTrack audioTrack ; int dispWidth = 0, dispHeight = 0; Handler handler = new Handler(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_audio); background = (RelativeLayout) findViewById(R.id.background); textView = (TextView) findViewById(R.id.textView2); soundPool = new SoundPool(1, AudioManager.STREAM_MUSIC, 0); dispWidth = AppHelper.getDisplayWidth(getApplicationContext()); dispHeight = AppHelper.getDisplayHeight(getApplicationContext()); audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, numSamples, AudioTrack.MODE_STREAM); final byte genTone[]= genTone(freqOfTone); background.setClickable(true); background.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { if(event.getAction()==MotionEvent.ACTION_UP) { Log.d(LOG_TAG, "Touch up! Stopping tone..."); audioTrack.pause(); audioTrack.flush(); } else { //these apparently cause immediate stop audioTrack.pause(); audioTrack.flush(); int R = (int) (event.getY()%255); int G = (int)(event.getX()%255); int B = (int) ((event.getY()+event.getX())%255); Log.i(LOG_TAG, "Changine colour to "+R+","+G+","+B); background.setBackgroundColor(Color.rgb(R, G, B)); int colorFromPressure = (int) (event.getPressure()*255); textView.setTextColor(Color.rgb(colorFromPressure,colorFromPressure,colorFromPressure)); playSoundAtFrequency(250+event.getY(), event.getX()/dispWidth); } return false; } }); } byte[] genTone(double toneFrequency){ final byte generatedSnd[] = new byte[2 * numSamples]; // fill out the array for (int i = 0; i &lt; numSamples; ++i) { sample[i] = Math.sin(2 * Math.PI * i / (sampleRate/toneFrequency)); } // convert to 16 bit pcm sound array // assumes the sample buffer is normalised. int idx = 0; for (double dVal : sample) { short val = (short) (dVal * 32767); generatedSnd[idx++] = (byte) (val &amp; 0x00ff); generatedSnd[idx++] = (byte) ((val &amp; 0xff00) &gt;&gt;&gt; 8); } return generatedSnd; } void playSound(final byte[] generatedSnd, float volume){ //these apparently cause immediate stop audioTrack.pause(); audioTrack.flush(); audioTrack.write(generatedSnd, 0, numSamples); audioTrack.setStereoVolume(volume, volume); audioTrack.play(); Log.d(LOG_TAG, "Playing tone..."); } public void playSoundAtFrequency(final double toneFrequency,float volume) { final byte genTone[]= genTone(toneFrequency); playSound(genTone, volume); } </code></pre>
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    1. USAndroidNoob
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      1. POIs it possible to generate a tone/audio of less than 1 second long? Or cut off player immediately?
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      1. POIs it possible to generate a tone/audio of less than 1 second long? Or cut off player immediately?
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    1. CODid you generate a tone of 0.5 seconds??
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      1. POIs it possible to generate a tone/audio of less than 1 second long? Or cut off player immediately?
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    2. CONo I didn't manage to generate a tone less than 1 second, however I was able to stop the track straight away but first pausing then flushing then releasing the audiotrack, so it did not matter that the tone was 1 second long
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      1. POIs it possible to generate a tone/audio of less than 1 second long? Or cut off player immediately?
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    3. COThanks for responding @AndroidNoob. I've done: **1.** Adding a durationFake (ex: 10 seconds) **2.** Repeat infinitely tone: `toneUnit.setLoopPoints (0, generatedSnd.length / (2 * AudioFormat.CHANNEL_OUT_MONO), -1);` **3.** Stop the sound in milliseconds with CountDownTimer. But this consumes a lot of memory. How did you exactly?
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      1. POIs it possible to generate a tone/audio of less than 1 second long? Or cut off player immediately?
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