Add decoder benchmark for host vs non-host endian

pkg/wave/decoder_bench_test.go

@@ -0,0 +1,49 @@
+package wave
+
+import (
+	"encoding/binary"
+	"fmt"
+	"testing"
+)
+
+func BenchmarkDecoder(b *testing.B) {
+	formats := []Format{
+		FormatInt16Interleaved,
+		FormatInt16NonInterleaved,
+		FormatFloat32Interleaved,
+		FormatFloat32NonInterleaved,
+	}
+
+	var nonHostEndian binary.ByteOrder
+	if hostEndian == binary.BigEndian {
+		nonHostEndian = binary.LittleEndian
+	} else {
+		nonHostEndian = binary.BigEndian
+	}
+
+	for _, format := range formats {
+		format := format
+		decoder, err := NewDecoder(format)
+		if err != nil {
+			b.Fatal(err)
+		}
+
+		b.Run(fmt.Sprintf("%sHostEndian", format), func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_, err := decoder.Decode(hostEndian, make([]byte, 800), 2)
+				if err != nil {
+					b.Fatal(err)
+				}
+			}
+		})
+
+		b.Run(fmt.Sprintf("%sNonHostEndian", format), func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_, err := decoder.Decode(nonHostEndian, make([]byte, 800), 2)
+				if err != nil {
+					b.Fatal(err)
+				}
+			}
+		})
+	}
+}