programmatically stream audio with NetStream

In Flex you can stream microphone audio to 开发者_运维知识库an FMS/Red5 server using NetStream.attachAudio, which requires a Microphone object. Is it possible to stream audio through the NetStream from somewhere other than a Microphone? For example, from a file/embedded resource?

The reason I'm asking is that I'd like to be able to run automated tests that don't require using an actual microphone.

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Well, it looks like this isn't possible. My workaround is to use SoundFlower to route audio file playback (invoked outside of Flash) into a virtual microphone, which Flash then streams to the media server. From Flash's point of view, its just as if you were manually speaking into the mic.