在阅读this示例的Java音乐可视化。我想知道作者从哪里得到的变量eightBitByteArray。有人能解释我如何创建这个数组或它代表什么吗？

for (int t = 0; t < eightBitByteArray.length;) {
    for (int channel = 0; channel < numChannels; channel++) {
        int low = (int) eightBitByteArray[t];
        t++;
        int high = (int) eightBitByteArray[t];
        t++;
        int sample = getSixteenBitSample(high, low);
       toReturn[channel][sampleIndex] = sample;
   }
   sampleIndex++;
}