play.launch

<launch>
  <!-- arecord -l will show available input devices, use the car number as
      the first number and the subdevice number as the second in a string
      like hw:1,0 -->
  <arg name="dst" default="alsasink"/>
  <arg name="device" default=""/>
  <arg name="do_timestamp" default="false"/>
  <arg name="format" default="mp3"/>
  <arg name="channels" default="1"/>
  <arg name="depth" default="16"/>
  <arg name="sample_rate" default="16000"/>
  <arg name="sample_format" default="S16LE"/>
  <arg name="ns" default="audio"/>
  <arg name="audio_topic" default="audio" />
  <arg name="play_volume" default="50"/>


  <group ns="$(arg ns)">
    <node name="audio_play" pkg="audio_play" type="audio_play" output="screen">
      <remap from="audio" to="$(arg audio_topic)" />
      <param name="dst" value="$(arg dst)"/>
      <param name="device" value="$(arg device)"/>
      <param name="do_timestamp" value="$(arg do_timestamp)"/>
      <param name="format" value="$(arg format)"/>
      <param name="channels" value="$(arg channels)"/>
      <param name="depth" value="$(arg depth)"/>
      <param name="sample_rate" value="$(arg sample_rate)"/>
      <param name="sample_format" value="$(arg sample_format)"/>
      <param name="play_volume" value="$(arg play_volume)"/>
    </node>
  </group>
</launch>