olly 4d03d30890 Audio extension decoders: Pass decoder to getOutputFormat
It seems generally useful to have access to the decoder in
getOutputFormat. We're currently working around lack of access
by using member variables in the concrete audio extension
renderers. In the case of the Ffmpeg extension, holding a
reference to the decoder is preventing it from being garbage
collected when the decoder is released by the base class.

PiperOrigin-RevId: 324799670
2020-08-07 19:00:18 +01:00
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