From d5cacaec07a22f11d21f1988a67cb4efbd771d29 Mon Sep 17 00:00:00 2001
From: Jean-Marc Valin <jmvalin@amazon.com>
Date: Fri, 2 Dec 2022 15:33:48 -0500
Subject: DRED: Fix infinite loop on "impossible" symbols

---
 silk/dred_coding.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/silk/dred_coding.c b/silk/dred_coding.c
index d2e71c74..9b0381d2 100644
--- a/silk/dred_coding.c
+++ b/silk/dred_coding.c
@@ -77,6 +77,8 @@ void dred_encode_latents(ec_enc *enc, const float *x, const opus_uint16 *scale,
         xq = x[i]*scale[i]*(1.f/256.f);
         xq = xq - delta*tanh(xq/(delta+eps));
         q = (int)floor(.5f+xq);
+        /* Make the impossible actually impossible. */
+        if (r[i] == 0 || p0[i] >= 32768) q = 0;
         ec_laplace_encode_p0(enc, q, p0[i], r[i]);
     }
 }
@@ -190,4 +192,4 @@ int main()
         printf("\n");
     }
 }
-#endif
\ No newline at end of file
+#endif
-- 
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