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Fixed implicit SBR detection via AudioSpecificConfig fail when char is unsigned.
Patch submitted by Fabian Greffrath

--- a/libfaad/mp4.c

+++ b/libfaad/mp4.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: mp4.c,v 1.40 2009/02/06 03:39:58 menno Exp $

+** $Id: mp4.c,v 1.41 2016/11/11 11:25:58 knik Exp $

 **/

 #include "common.h"

@@ -276,7 +276,7 @@

     /* no SBR signalled, this could mean either implicit signalling or no SBR in this file */

     /* MPEG specification states: assume SBR on files with samplerate <= 24000 Hz */

-    if (mp4ASC->sbr_present_flag == -1)

+    if (mp4ASC->sbr_present_flag == (char)-1) /* cannot be -1 on systems with unsigned char */

     {

         if (mp4ASC->samplingFrequency <= 24000)

         {