shithub: sox

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add headroom value

--- a/src/rate.c

+++ b/src/rate.c

@@ -494,6 +494,9 @@

   if (effp->in_signal.rate == out_rate)

     return SOX_EFF_NULL;

+  if (effp->flow == 0 && effp->in_signal.mult)

+    *effp->in_signal.mult *= .705; /* 1/(2/sinc(pi/3)-1); see De Soras 4.1.2 */

+

   effp->out_signal.channels = effp->in_signal.channels;

   effp->out_signal.rate = out_rate;

   rate_init(&p->rate, p->shared_ptr, effp->in_signal.rate / out_rate,