Example usage for android.media AudioTrack getPlaybackHeadPosition

Introduction

In this page you can find the example usage for android.media AudioTrack getPlaybackHeadPosition.

Prototype

public int getPlaybackHeadPosition() 

Source Link

Document

Returns the playback head position expressed in frames.

Usage

From source file:net.reichholf.dreamdroid.fragment.SignalFragment.java

void playSound(double freqOfTone) {
    double duration = 0.1; // seconds
    int sampleRate = 8000; // a number

    double dnumSamples = duration * sampleRate;
    dnumSamples = Math.ceil(dnumSamples);
    int numSamples = (int) dnumSamples;
    double sample[] = new double[numSamples];
    byte generatedSnd[] = new byte[2 * numSamples];

    for (int i = 0; i < numSamples; ++i) { // Fill the sample array
        sample[i] = Math.sin(freqOfTone * 2 * Math.PI * i / (sampleRate));
    }//  www. java  2 s . c  om

    // convert to 16 bit pcm sound array
    // assumes the sample buffer is normalized.
    int idx = 0;
    int i = 0;

    int ramp = numSamples / 20; // Amplitude ramp as a percent of sample
    // count

    for (i = 0; i < numSamples; ++i) { // Ramp amplitude up (to avoid
        // clicks)
        if (i < ramp) {
            double dVal = sample[i];
            // Ramp up to maximum
            final short val = (short) ((dVal * 32767 * i / ramp));
            // in 16 bit wav PCM, first byte is the low order byte
            generatedSnd[idx++] = (byte) (val & 0x00ff);
            generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);
        } else if (i < numSamples - ramp) {
            // Max amplitude for most of the samples
            double dVal = sample[i];
            // scale to maximum amplitude
            final short val = (short) ((dVal * 32767));
            // in 16 bit wav PCM, first byte is the low order byte
            generatedSnd[idx++] = (byte) (val & 0x00ff);
            generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);
        } else {
            double dVal = sample[i];
            // Ramp down to zero
            final short val = (short) ((dVal * 32767 * (numSamples - i) / ramp));
            // in 16 bit wav PCM, first byte is the low order byte
            generatedSnd[idx++] = (byte) (val & 0x00ff);
            generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);
        }
    }

    AudioTrack audioTrack = null; // Get audio track
    try {
        audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate, AudioFormat.CHANNEL_OUT_MONO,
                AudioFormat.ENCODING_PCM_16BIT, (int) numSamples * 2, AudioTrack.MODE_STATIC);
        // Load the track
        audioTrack.write(generatedSnd, 0, generatedSnd.length);
        audioTrack.play(); // Play the track
    } catch (Exception e) {
    }

    int x = 0;
    do { // Montior playback to find when done
        if (audioTrack != null)
            x = audioTrack.getPlaybackHeadPosition();
        else
            x = numSamples;
    } while (x < numSamples);

    if (audioTrack != null)
        audioTrack.release(); // Track play done. Release track.
}

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