An AudioSource that provides audio dynamically. Subclasses must override
request to provide the encoded audio data. This API is experimental.
Invoked when a non-existent method or property is accessed. [...]
request([int? start, int? end])
Used by the player to request a byte range of encoded audio data in small
chunks, from byte position
start inclusive (or from the beginning of the
audio data if not specified) to
end exclusive (or the end of the audio
data if not specified). If the returned future completes with an error,
a 500 response will be sent back to the player.
A string representation of this object. [...]