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Adds -random_fec option to randomly add FEC to some frames.

Undocumented for now

--- a/src/opus_demo.c

+++ b/src/opus_demo.c

@@ -142,6 +142,7 @@

     int sweep_bps = 0;

     int random_framesize=0, newsize=0, delayed_celt=0;

     int sweep_max=0, sweep_min=0;

+    int random_fec=0;

     if (argc < 5 )

     {

@@ -297,6 +298,10 @@

             check_encoder_option(decode_only, "-sweep_max");

             sweep_max = atoi( argv[ args + 1 ] );

             args += 2;

+        } else if( STR_CASEINSENSITIVE_COMPARE( argv[ args ], "-random_fec" ) == 0 ) {

+            check_encoder_option(decode_only, "-random_fec");

+            random_fec = 1;

+            args++;

         } else {

             printf( "Error: unrecognized setting: %s\n\n", argv[ args ] );

             print_usage( argv );

@@ -430,6 +435,10 @@

             } else {

                 frame_size = newsize;

             }

+        }

+        if (random_fec && rand()%30==0)

+        {

+           opus_encoder_ctl(enc, OPUS_SET_INBAND_FEC(rand()%4==0));

         }

         if (decode_only)

         {