control: use more precise rounding in snd_ctl_ascii_value_parse()

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 11 insertions, 8 deletions

diff --git a/src/control/ctlparse.c b/src/control/ctlparse.c
index b0bb5ee3..1ac31bb9 100644
--- a/src/control/ctlparse.c
+++ b/src/control/ctlparse.c
@@ -33,17 +33,20 @@
 
 /* Function to convert from percentage to volume. val = percentage */
 
-#ifdef HAVE_SOFT_FLOAT
-static inline long int convert_prange1(long val, long min, long max)
+static inline long int convert_prange1(long perc, long min, long max)
 {
-	long temp = val * (max - min);
-	return temp / 100 + min + ((temp % 100) == 0 ? 0 : 1);
-}
-#else
+	long tmp;
 
-#define convert_prange1(val, min, max) \
-	ceil((val) * ((max) - (min)) * 0.01 + (min))
+#ifdef HAVE_SOFT_FLOAT
+	tmp = perc * (max - min);
+	tmp = tmp / 100 + ((tmp % 100) < 50 ? 0 : 1);
+#else
+	tmp = rint((double)perc * (double)(max - min) * 0.01);
 #endif
+	if (tmp == 0 && perc > 0)
+		tmp++;
+	return tmp + min;
+}
 
 #define check_range(val, min, max) \
 	((val < min) ? (min) : ((val > max) ? (max) : (val)))