public com.google.cloud.video.livestream.v1.AudioStream.AudioMapping.Builder
        addMappingBuilder() {
      return getMappingFieldBuilder()
          .addBuilder(
              com.google.cloud.video.livestream.v1.AudioStream.AudioMapping.getDefaultInstance());
    }
<pre>
The mapping for the input streams and audio channels.
</pre>

<code>repeated .google.cloud.video.livestream.v1.AudioStream.AudioMapping mapping = 5;</code>
java-video-live-stream/proto-google-cloud-live-stream-v1/src/main/java/com/google/cloud/video/livestream/v1/AudioStream.java