@java.lang.Override
    public int getInputTrack() {
      return inputTrack_;
    }
<pre>
Required. The zero-based index of the track in the input stream.
All [mapping][google.cloud.video.livestream.v1.AudioStream.mapping]s in
the same [AudioStream][google.cloud.video.livestream.v1.AudioStream] must
have the same input track.
</pre>

<code>int32 input_track = 2 [(.google.api.field_behavior) = REQUIRED];</code>

@return The inputTrack.
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/AudioStream.java