@java.lang.Override
      public int getInputChannel() {
        return inputChannel_;
      }
<pre>
Required. The zero-based index of the channel in the input audio stream.
</pre>

<code>int32 input_channel = 4 [(.google.api.field_behavior) = REQUIRED];</code>

@return The inputChannel.
java-video-transcoder/proto-google-cloud-video-transcoder-v1/src/main/java/com/google/cloud/video/transcoder/v1/AudioStream.java