ref: 5626908ec3c96a79640b26bee42549c82eb26689
parent: aed1009df97a0e116c276751d83455bbbf47d3fb
author: Jean-Marc Valin <[email protected]>
date: Thu Dec 5 11:40:59 EST 2013
Fixed-point fast-path for normal 48 kHz encoding in celt_preemphasis()
--- a/celt/celt_encoder.c
+++ b/celt/celt_encoder.c
@@ -469,7 +469,24 @@
int Nu;
coef0 = coef[0];
+ m = *mem;
+#ifdef FIXED_POINT
+ /* Fast path for fixed-point in the normal 48kHz case */
+ if (coef[1] == 0 && upsample == 1)
+ {+ for (i=0;i<N;i++)
+ {+ opus_val16 x;
+ x = SCALEIN(pcmp[CC*i]);
+ /* Apply pre-emphasis */
+ inp[i] = SHL32(x, SIG_SHIFT) - m;
+ m = SHR32(MULT16_16(coef0, x), 15-SIG_SHIFT);
+ }
+ *mem = m;
+ return;
+ }
+#endif
Nu = N/upsample;
if (upsample!=1)
@@ -500,7 +517,6 @@
#else
(void)clip; /* Avoids a warning about clip being unused. */
#endif
- m = *mem;
#ifdef CUSTOM_MODES
if (coef[1] != 0)
{