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Some code for packet loss and bit error simulation

--- a/libcelt/testcelt.c

+++ b/libcelt/testcelt.c

@@ -59,7 +59,7 @@

    int count = 0;

    int skip;

    celt_int16_t *in, *out;

-   if (argc != 8)

+   if (argc != 9 && argc != 8)

    {

       fprintf (stderr, "Usage: testcelt <rate> <channels> <frame size> <overlap> <bytes per packet> <input> <output>\n");

       return 1;

@@ -118,18 +118,31 @@

          fprintf (stderr, "celt_encode() returned %d\n", len);

          return 1;

       }

+      /* This is for simulating bit errors */

 #if 0

+      int errors = 0;

+      int eid = 0;

       /* This simulates random bit error */

-      for (i=30;i<len*8;i++)

+      for (i=0;i<len*8;i++)

       {

-         if (rand()%1000==0)

+         if (rand()%atoi(argv[8])==0)

          {

+            if (i<64)

+            {

+               errors++;

+               eid = i;

+            }

             data[i/8] ^= 1<<(7-(i%8));

          }

       }

+      if (errors == 1)

+         data[eid/8] ^= 1<<(7-(eid%8));

+      else if (errors%2 == 1)

+         data[rand()%8] ^= 1<<rand()%8;

 #endif

       /* This is to simulate packet loss */

-      if (rand()%100==-1)

+      if (argc==9 && rand()%1000<atoi(argv[8]))

+      /*if (errors && (errors%2==0))*/

          celt_decode(dec, NULL, len, out);

       else

          celt_decode(dec, data, len, out);