change SampleRate to float64
@@ -4,7 +4,7 @@ package audio
//
// This value should be set at most once before using audio package. It is safe to assume that this
// value does not change during runtime.
-var SampleRate = 48000
+var SampleRate float64 = 48000
// Streamer is able to stream a finite or infinite sequence of audio samples.
type Streamer interface {
