Autodetect Avro schema from Avro file

I'm building a pipeline where I'm reading a set of Avro files, all with same schema. These Avro contains the schema definition. To get GenericRecords, I today have to specify the schema for the files in my pipeline. It would be very neat to use the fact that my Avro files contains the schema definition already. Something like 
AvroIO.readFilesGenericRecordsParseSchemaFromSource().