public Builder setOriginalMimeType(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      originalMimeType_ = value;
      bitField0_ |= 0x00000040;
      onChanged();
      return this;
    }
<pre>
Mime type of the original audio file.  For example `audio/m4a`,
`audio/x-alaw-basic`, `audio/mp3`, `audio/3gpp`.
A list of possible audio mime types is maintained at
http://www.iana.org/assignments/media-types/media-types.xhtml#audio
</pre>

<code>string original_mime_type = 8;</code>

@param value The originalMimeType to set.
@return This builder for chaining.
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/RecognitionMetadata.java