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tempo: calculate output length

--- a/src/tempo.c

+++ b/src/tempo.c

@@ -251,6 +251,7 @@

 static int start(sox_effect_t * effp)

 {

   priv_t * p = (priv_t *)effp->priv;

+

   if (p->factor == 1)

     return SOX_EFF_NULL;

@@ -257,7 +258,14 @@

   p->tempo = tempo_create((size_t)effp->in_signal.channels);

   tempo_setup(p->tempo, effp->in_signal.rate, p->quick_search, p->factor,

       p->segment_ms, p->search_ms, p->overlap_ms);

-  effp->out_signal.length = SOX_UNKNOWN_LEN; /* TODO: calculate actual length */

+

+  effp->out_signal.length = SOX_UNKNOWN_LEN;

+  if (effp->in_signal.length != SOX_UNKNOWN_LEN) {

+    uint64_t in_length = effp->in_signal.length / effp->in_signal.channels;

+    uint64_t out_length = in_length / p->factor + .5;

+    effp->out_signal.length = out_length * effp->in_signal.channels;

+  }

+

   return SOX_SUCCESS;

 }