feat(go/audio): implement basic audio output with oto

splitting implementation into a separate package to potentially allow for other sorts of output, too.

go4k/audio/convertbuffer.go

@@ -0,0 +1,22 @@
+package audio
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"math"
+)
+
+// FloatBufferTo16BitLE is a naive helper method to convert []float32 buffers to
+// 16-bit little-endian integer buffers.
+// TODO: optimize/refactor this, current is far from the best solution
+func FloatBufferTo16BitLE(buff []float32) ([]byte, error) {
+	var buf bytes.Buffer
+	for i, v := range buff {
+		uv := int16(v * math.MaxInt16)
+		if err := binary.Write(&buf, binary.LittleEndian, uv); err != nil {
+			return nil, fmt.Errorf("error converting buffer (@ %v, value %v) to bytes: %w", i, v, err)
+		}
+	}
+	return buf.Bytes(), nil
+}