@java.lang.Override
    public int getSerializedSize() {
      int size = memoizedSize;
      if (size != -1) return size;

      size = 0;
      if (inputTrack_ != 0) {
        size += com.google.protobuf.CodedOutputStream.computeInt32Size(2, inputTrack_);
      }
      if (inputChannel_ != 0) {
        size += com.google.protobuf.CodedOutputStream.computeInt32Size(3, inputChannel_);
      }
      if (outputChannel_ != 0) {
        size += com.google.protobuf.CodedOutputStream.computeInt32Size(4, outputChannel_);
      }
      if (java.lang.Double.doubleToRawLongBits(gainDb_) != 0) {
        size += com.google.protobuf.CodedOutputStream.computeDoubleSize(5, gainDb_);
      }
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(inputKey_)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(6, inputKey_);
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSize = size;
      return size;
    }
<pre>
Audio volume control in dB. Negative values decrease volume,
positive values increase. The default is 0.
</pre>

<code>double gain_db = 5;</code>

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