I can assume based on the below excerpts from ac3enc.c that the AC3 encoder 
defaults to None for the Dynamic Range Compression profile specified on page 10 
in Dolby's Metadata Guide:

659         /* assumptions:
     *   no dynamic range codes
     *   bit allocation parameters do not change between blocks
     *   no delta bit allocation
     *   no skipped data
     *   no auxiliary data
     *   no E-AC-3 metadata

1402       /* dynamic range codes */
1403       put_bits(&s->pb, 1, 0);

If this is not the case could someone explain the above code?

Is there a way to apply specific DRC profiles per the Metadata guide?

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