faster version of volume dB conversion routine

1 files changed, 4 insertions, 1 deletions

diff --git a/volume.c b/volume.c
index 7b82623e..24e876ff 100644
--- a/volume.c
+++ b/volume.c
@@ -64,7 +64,10 @@ volume_get_amp (void) {
 
 float
 db_to_amp (float dB) {
-    return pow (10, dB/20.f);
+//    return pow (10, dB/20.f);
+    // thanks to he for this hack
+    const float ln10=2.3025850929940002f;
+    return exp(ln10*dB/20.f);
 }
 
 float