Saturate MDCT output post-TDAC rather than pre-

Gives us a tighter bound on the pitch postfilter input to avoid overflows

1 files changed, 6 insertions, 0 deletions

diff --git a/celt/celt_decoder.c b/celt/celt_decoder.c
index 6f7b34d3..0d9364d8 100644
--- a/celt/celt_decoder.c
+++ b/celt/celt_decoder.c
@@ -345,6 +345,12 @@ void celt_synthesis(const CELTMode *mode, celt_norm *X, celt_sig * out_syn[],
             clt_mdct_backward(&mode->mdct, &freq[b], out_syn[c]+NB*b, mode->window, overlap, shift, B, arch);
       } while (++c<CC);
    }
+   /* Saturate IMDCT output so that we can't overflow in the pitch postfilter
+      or in the */
+   c=0; do {
+      for (i=0;i<N;i++)
+         out_syn[c][i] = SATURATE(out_syn[c][i], SIG_SAT);
+   } while (++c<CC);
    RESTORE_STACK;
 }