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POC++ reading 16bit Wav file
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  1. POC++ reading 16bit Wav file
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    copied!<p>I'm having trouble reading in a 16bit .wav file. I have read in the header information, however, the conversion does not seem to work.</p> <p>For example, in Matlab if I read in wave file I get the following type of data:</p> <pre><code> -0.0064, -0.0047, -0.0051, -0.0036, -0.0046, -0.0059, -0.0051 </code></pre> <p>However, in my C++ program the following is returned:</p> <pre><code>0.960938, -0.00390625, -0.949219, -0.00390625, -0.996094, -0.00390625 </code></pre> <p>I need the data to be represented the same way. Now, for <code>8 bit</code> .wav files I did the following:</p> <pre><code>uint8_t c; for(unsigned i=0; (i &lt; size); i++) { c = (unsigned)(unsigned char)(data[i]); double t = (c-128)/128.0; rawSignal.push_back(t); } </code></pre> <p>This worked, however, when I did this for 16bit:</p> <pre><code>uint16_t c; for(unsigned i=0; (i &lt; size); i++) { c = (signed)(signed char)(data[i]); double t = (c-256)/256.0; rawSignal.push_back(t); } </code></pre> <p>Does not work and shows the output (above). </p> <p>I'm following the standards found <a href="http://www.mathworks.co.uk/help/matlab/ref/wavread.html" rel="nofollow noreferrer">Here</a></p> <p>Where <code>data</code> is a <code>char</code> array and <code>rawSignal</code> is a <code>std::vector&lt;double&gt;</code> I'm probably just handing the conversion wrong but cannot seem to find out where. Anyone have any suggestions?</p> <p>Thanks</p> <p>EDIT:</p> <p>This is what is now displaying (In a graph):</p> <p><img src="https://i.stack.imgur.com/Ws26O.jpg" alt="enter image description here"></p> <p>This is what it should be displaying:</p> <p><img src="https://i.stack.imgur.com/ZY4Ms.jpg" alt="enter image description here"></p>
 

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