Minimal wav file read and write in Go lang

minimalWAV.go

package main

import (
	"os"

	"github.com/go-audio/wav"
)

const filename = "pulse440_32bitFloat48kHz.wav"

//const filename = "pulse440_16bit48kHz.wav"
//const filename = "pulse440_24bit48kHz.wav"

func main() {
	// Open Wav file
	f, err := os.Open(filename)
	if err != nil {
		panic(err)
	}
	defer f.Close()

	// Create wav decoder
	wd := wav.NewDecoder(f)
	if wd.IsValidFile() {
		// Get IntBuffer
		buf, err := wd.FullPCMBuffer()
		if err != nil {
			panic(err)
		}

		// Create output wav file
		out, err := os.Create("output.wav")
		if err != nil {
			panic(err)
		}
		defer out.Close()

		// Create wav encoder
		e := wav.NewEncoder(out,
			buf.Format.SampleRate,
			int(wd.BitDepth),
			buf.Format.NumChannels,
			int(wd.WavAudioFormat))
		defer e.Close()

		// Write IntBuffer to output file via encoder
		if err = e.Write(buf); err != nil {
			panic(err)
		}
	}

}