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Rollback of https://github.com/google/ExoPlayer/commit/dd7b379dc0344316488eb816e06638182a9eed90 · d01093d7
*** Original commit *** DataSource.open() throws if already opened. Update DataSource implementations to throw an error if open() is called when the DataSource is already open. *** PiperOrigin-RevId: 348783425
olly committed