Fix wrong scales in linear volume calculation

Fixed wrong scales of dB values (TLV is 0.01dB unit) in the linear
volume calculation.

diff --git a/src/mixer/simple_none.c b/src/mixer/simple_none.c
index c1f452777628da4d2eaa68ef4da00b8b86c73240..58ffe4aff9fe6688a3cc259b7b1ccde4aa027f1b 100644 (file)
--- a/src/mixer/simple_none.c
+++ b/src/mixer/simple_none.c
@@ -1091,8 +1091,8 @@ static int do_convert_to_dB(unsigned int *tlv, long rangemin, long rangemax,
                                        maxdb;
                        else {
                                /* FIXME: precalculate and cache these values */
-                               double lmin = pow(10.0, mindb/20.0);
-                               double lmax = pow(10.0, maxdb/20.0);
+                               double lmin = pow(10.0, mindb/2000.0);
+                               double lmax = pow(10.0, maxdb/2000.0);
                                val = (lmax - lmin) * val + lmin;
                                *db_gain = (long)(100.0 * 20.0 * log10(val));
                        }
@@ -1293,9 +1293,9 @@ static int do_convert_from_dB(unsigned int *tlv, long rangemin, long rangemax,
                        /* FIXME: precalculate and cache vmin and vmax */
                        double vmin, vmax, v;
                        vmin = (min <= SND_CTL_TLV_DB_GAIN_MUTE) ? 0.0 :
-                               pow(10.0,  (double)min / 20.0);
-                       vmax = !max ? 1.0 : pow(10.0,  (double)max / 20.0);
-                       v = pow(10.0, (double)db_gain / 20.0);
+                               pow(10.0,  (double)min / 2000.0);
+                       vmax = !max ? 1.0 : pow(10.0,  (double)max / 2000.0);
+                       v = pow(10.0, (double)db_gain / 2000.0);
                        v = (v - vmin) * (rangemax - rangemin) / (vmax - vmin);
                        if (xdir > 0)
                                v = ceil(v);