Define basic audio data interface

pkg/wave/wave_test.go

@@ -0,0 +1,61 @@
+package wave
+
+import (
+	"math"
+	"reflect"
+	"testing"
+)
+
+func TestConvert(t *testing.T) {
+	cases := map[string]struct {
+		in       []Sample
+		typ      SampleFormat
+		expected []Sample
+	}{
+		"Int16ToFloat32": {
+			in: []Sample{
+				Int16Sample(-0x1000),
+				Int16Sample(-0x100),
+				Int16Sample(0x0),
+				Int16Sample(0x100),
+				Int16Sample(0x1000),
+			},
+			typ: Float32SampleFormat,
+			expected: []Sample{
+				Float32Sample(-math.Pow(2, -4)),
+				Float32Sample(-math.Pow(2, -8)),
+				Float32Sample(0.0),
+				Float32Sample(math.Pow(2, -8)),
+				Float32Sample(math.Pow(2, -4)),
+			},
+		},
+		"Float32ToInt16": {
+			in: []Sample{
+				Float32Sample(-math.Pow(2, -4)),
+				Float32Sample(-math.Pow(2, -8)),
+				Float32Sample(0.0),
+				Float32Sample(math.Pow(2, -8)),
+				Float32Sample(math.Pow(2, -4)),
+			},
+			typ: Int16SampleFormat,
+			expected: []Sample{
+				Int16Sample(-0x1000),
+				Int16Sample(-0x100),
+				Int16Sample(0x0),
+				Int16Sample(0x100),
+				Int16Sample(0x1000),
+			},
+		},
+	}
+	for name, c := range cases {
+		c := c
+		t.Run(name, func(t *testing.T) {
+			for i := range c.in {
+				s := c.typ.Convert(c.in[i])
+				if !reflect.DeepEqual(c.expected[i], s) {
+					t.Errorf("Convert result differs, expected: %v, got: %v", c.expected[i], s)
+				}
+			}
+		})
+	}
+}