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The bugfix does not fully fix DRC processing in FAAD2 but
significantly improves the implementation.
Patch by unknown author.

--- a/libfaad/drc.c

+++ b/libfaad/drc.c

@@ -25,7 +25,7 @@

 ** Commercial non-GPL licensing of this software is possible.

 ** For more info contact Nero AG through Mpeg4AAClicense@nero.com.

 **

-** $Id: drc.c,v 1.28 2007/11/01 12:33:30 menno Exp $

+** $Id: drc.c,v 1.29 2015/02/22 10:09:29 knik Exp $

 **/

 #include "common.h"

@@ -130,9 +130,9 @@

 #ifndef FIXED_POINT

         /* Decode DRC gain factor */

         if (drc->dyn_rng_sgn[bd])  /* compress */

-            exp = -drc->ctrl1 * (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level))/REAL_CONST(24.0);

+            exp = ((-drc->ctrl1 * drc->dyn_rng_ctl[bd]) - (DRC_REF_LEVEL - drc->prog_ref_level))/REAL_CONST(24.0);

         else /* boost */

-            exp = drc->ctrl2 * (drc->dyn_rng_ctl[bd] - (DRC_REF_LEVEL - drc->prog_ref_level))/REAL_CONST(24.0);

+            exp = ((drc->ctrl2 * drc->dyn_rng_ctl[bd]) - (DRC_REF_LEVEL - drc->prog_ref_level))/REAL_CONST(24.0);

         factor = (real_t)pow(2.0, exp);

         /* Apply gain factor */