title: Confusion in aplay Command.
body: <p>Here i want to understand this commmand.</p>
  
  <pre><code>aplay -D hw:0,0 /opt/WL1271_demo_01/gallery/Pop.wav
  </code></pre>
  
  <p>Why we used <code>asound.conf</code> file.</p>
  
  <p>we have to need update bluetooth address of hands free device in this file to play audio in handsfree device?</p>
  
  <p>Can anybody Explain me <code>aplay</code> command and how its works?</p>
  
  <p>why we used here <code>-D hw:0,0</code> in this?</p>
  
  <p>why we not used here <code>-Dplug:bluetooth hw:0,0</code> ?</p>
  
  <p>==================================================================</p>
  
  <p>Here is my /etc/asound.conf file</p>
  
  <pre><code>    pcm.!bluetooth {
      type bluetooth
      device 00:23:78:41:AB:9F
          playback_ports {
                  0 alsa_pcm:playback_1
                  1 alsa_pcm:playback_2
          }
          capture_ports {
                  0 alsa_pcm:capture_1
                  1 alsa_pcm:capture_2
          }
  
      }
  
  pcm.!default {
      type plug
      slave.pcm bluetooth
      }
  
  
  pcm.jack {
          type jack
          playback_ports {
                  0 alsa_pcm:playback_1
                  1 alsa_pcm:playback_2
          }
          capture_ports {
                  0 alsa_pcm:capture_1
                  1 alsa_pcm:capture_2
          }
  }
  </code></pre>