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POMix two files audio wav on android use short array
 

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    <p>to write my programs, but it does not work so well, I do not know where I was wrong. Before that I used byte [] to store data from wav (it works pretty good but noisy) so I switched to short [], but the results were very bad.</p> <p><strong>This my code:</strong></p> <pre><code>public class Mix extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); try { mixSound(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } private void mixSound() throws IOException { in1 = getResources().openRawResource(R.raw.media_b); //16-bit little-endian, 1411kbps, 44100Hz, 2 channels in2 = getResources().openRawResource(R.raw.media_c); //16-bit little-endian, 1411kbps, 44100Hz, 2 channels List&lt;Short&gt; music1 = createMusicArray(in1); List&lt;Short&gt; music2 = createMusicArray(in2); completeStreams(music1, music2); short[] arrayMusic1 = buildShortArray(music1);; short[] arrayMusic2 = buildShortArray(music2); output = new short[arrayMusic1.length]; for (int i = 0; i &lt; output.length; i++) { } saveToFile(); } /** * createMusicArray reads the stream and returns a list of short objects (the samples) */ public List&lt;Short&gt; createMusicArray (InputStream ins) throws IOException { List&lt;Short&gt; musicList = new ArrayList&lt;Short&gt;(); ByteArrayOutputStream baos = new ByteArrayOutputStream(); byte[] byteArray = new byte[50*1024]; int i = Integer.MAX_VALUE; while ((i = ins.read(byteArray, 0, byteArray.length)) &gt; 0) { baos.write(byteArray, 0, i); } for (int j = 0; j &lt; byteArray.length; j++) { short objShort = (short)(byteArray[j]); musicList.add(objShort); } return musicList; } /** * completeStreams normalizes the streams by adding a series of '0' shorts at the end of smaller files. At the end the 2 files have all the same length. */ public void completeStreams(List&lt;Short&gt; mListShort_1, List&lt;Short&gt; mListShort_2) { //TODO: check length int size_a = mListShort_1.size(); int size_b = mListShort_2.size(); if (size_a &gt; size_b){ // adding series of '0' for (int i = size_b+1; i &lt;= size_a; i++) { mListShort_2.set(i, (short) 0); } } else if (size_a &lt; size_b) { for (int i = size_a+1; i &lt;= size_b; i++) { mListShort_1.set(i, (short) 0); } } else { //do nothing } } private byte[] shortArrayToByteArray(short[] shortArr) { /** int index; int iterations = shortArr.length; ByteBuffer byteBuffer = ByteBuffer.allocate(shortArr.length * 2); for(index = 0; index != iterations; ++index){ byteBuffer.putShort(shortArr[index]); } return byteBuffer.array(); */ int short_index, byte_index; int iterations = shortArr.length; byte [] buffer = new byte[shortArr.length * 2]; short_index = byte_index = 0; for(/*NOP*/; short_index != iterations; /*NOP*/) { buffer[byte_index] = (byte) (shortArr[short_index] &amp; 0x00FF); buffer[byte_index + 1] = (byte) ((shortArr[short_index] &amp; 0xFF00) &gt;&gt; 8); ++short_index; byte_index += 2; } return buffer; } private byte[] intToByteArray(int i) { byte[] b = new byte[4]; b[0] = (byte) (i &amp; 0x00FF); b[1] = (byte) ((i &gt;&gt; 8) &amp; 0x000000FF); b[2] = (byte) ((i &gt;&gt; 16) &amp; 0x000000FF); b[3] = (byte) ((i &gt;&gt; 24) &amp; 0x000000FF); return b; } private byte[] shortToByteArray(short data) { byte[] b = new byte[2]; b[0] = (byte) (data &amp; 0xff); b[1] = (byte) ((data &gt;&gt; 8) &amp; 0xff); return b; } public static long byteArrayToLong(byte[] b) { int start = 0; int i = 0; int len = 4; int cnt = 0; byte[] tmp = new byte[len]; for (i = start; i &lt; (start + len); i++) { tmp[cnt] = b[i]; cnt++; } long accum = 0; i = 0; for (int shiftBy = 0; shiftBy &lt; 32; shiftBy += 8) { accum |= ((long) (tmp[i] &amp; 0xff)) &lt;&lt; shiftBy; i++; } return accum; } </code></pre> <p>}</p> <p>Can you help me. Thank you very much!</p>
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