pcm_utils: added inline function pcm_float_to_volume()

src/pcm_utils.h

@@ -36,6 +36,16 @@ struct pcm_convert_state {
 	int error;
 };
 
+/**
+ * Converts a float value (0.0 = silence, 1.0 = 100% volume) to an
+ * integer volume value (1000 = 100%).
+ */
+static inline int
+pcm_float_to_volume(float volume)
+{
+	return volume * 1000.0 + 0.5;
+}
+
 void pcm_volume(char *buffer, int bufferSize,
 		const struct audio_format *format,
 		int volume);

src/volume.c

@@ -22,6 +22,7 @@
 #include "player_control.h"
 #include "utils.h"
 #include "idle.h"
+#include "pcm_utils.h"
 #include "os_compat.h"
 
 #include "../config.h"
@@ -483,8 +484,8 @@ static int changeSoftwareVolume(int change, int rel)
 	else if (new <= 0)
 		new = 0;
 	else
-		new =
-		    1000.0 * (exp(new / 25.0) - 1) / (54.5981500331F - 1) + 0.5;
+		new = pcm_float_to_volume((exp(new / 25.0) - 1) /
+					  (54.5981500331F - 1));
 
 	setPlayerSoftwareVolume(new);