title: Using AEC(webrtc) instead of AECM(webrtc)
body: <p>I used <code>aecm(webrtc)</code> on my ARM-based embedded device for voice communication. Now, I'm trying to change <code>aecm</code> to <code>aec</code> for double-talk echo cancellation.</p>
  
  <p>It's simple in <code>aecm</code>: </p>
  
  <pre><code>WebRtcAecm_Create()-&gt;WebRtcAecm_Init()-&gt;WebRtcAecm_BufferFarend()-&gt;WebRtcAecm_Process(). 
  </code></pre>
  
  <p>And all <code>data(near, far, out)</code> formats are 16bit signed short. However, just changing functions from <code>WebRtcAecm_* to WebRtcAec_*</code> and signed-short data to float(divided by 32768) didn't work.</p>
  
  <p>I tried to find some examples in audio_processing <code>unittest</code>, but couldn't find any. What am I missing?</p>