Meta containing Audio Level Indication: https://tools.ietf.org/html/rfc6464
the -dBov from 0-127 (127 is silence).
parent #GstMeta
whether the buffer contains voice activity
Return the #GstMetaInfo associated with #GstAudioLevelMeta.
Meta containing Audio Level Indication: https://tools.ietf.org/html/rfc6464