Access uncompressed audio from media player

I am working on something for a client and need to be able to get the original uncompressed audio that was contained in a media source that is playing in a media player. The client uses a data embedder to embed camera telemetry data in audio packets. I need to access the raw audio byte stream and decode this camera telemetry data. The media source can be either an AJA media source or file media source. I’m able to get to the audio byte stream via the IMediaAudioSample’s GetBuffer() method, but the data is no longer uncompressed and the identifiers for the telemetry packets no longer exist. Is there a way to get the uncompressed audio data out of the media player each frame? Thanks for any help you can provide!