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POAudio: Change Volume of samples in byte array
 

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    <p>I'm reading a wav-file to a byte array using <a href="http://snippi.com/s/ndi3f4x">this method (shown below)</a>. Now that I have it stored inside my byte array, I want to change the sounds volume.</p> <pre><code>private byte[] getAudioFileData(final String filePath) { byte[] data = null; try { final ByteArrayOutputStream baout = new ByteArrayOutputStream(); final File file = new File(filePath); final AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file); byte[] buffer = new byte[4096]; int c; while ((c = audioInputStream.read(buffer, 0, buffer.length)) != -1) { baout.write(buffer, 0, c); } audioInputStream.close(); baout.close(); data = baout.toByteArray(); } catch (Exception e) { e.printStackTrace(); } return data; } </code></pre> <p><strong>Edit:</strong> Per request some info on the audio format:</p> <blockquote> <p>PCM_SIGNED 44100.0 Hz, 16 bit, mono, 2 bytes/frame, little-endian</p> </blockquote> <p>From physics-class I remembered that you can change the amplitude of a sine-wave by multiplying the sine-value with a number between 0 and 1.</p> <p><strong>Edit: Updated code for 16-bit samples:</strong></p> <pre><code>private byte[] adjustVolume(byte[] audioSamples, double volume) { byte[] array = new byte[audioSamples.length]; for (int i = 0; i &lt; array.length; i+=2) { // convert byte pair to int int audioSample = (int) ((audioSamples[i+1] &amp; 0xff) &lt;&lt; 8) | (audioSamples[i] &amp; 0xff); audioSample = (int) (audioSample * volume); // convert back array[i] = (byte) audioSample; array[i+1] = (byte) (audioSample &gt;&gt; 8); } return array; } </code></pre> <p>The sound is heavily distorted if I multiply <code>audioSample</code> with <code>volume</code>. If I don't and compare both arrays with <code>Arrays.compare(array, audioSample)</code> I can conclude that the byte-array is being converted correctly to int and the other way around.</p> <p>Can anybody help me out? What am I getting wrong here? Thank you! :)</p>
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    1. COYou might get better answers on dsp.stackexchange.com
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    2. CO1) For better help sooner, post an [SSCCE](http://sscce.org/). 2) Report `audioInputStream.getFormat()`.
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    3. CO@egrunin Thank you! Can I just copy & paste it there or what are the rules for moving topics?
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