example on concating two (or more) wav files

concat-wav.go

package main

import (
	"io"
	"io/ioutil"

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

func main() {
	// Read input1.wav and input2.wav
	i1, _ := ioutil.ReadFile("1.wav")
	i2, _ := ioutil.ReadFile("2.wav")

	// Create wav.File.
	a := &wav.File{}
	b := &wav.File{}

	// Unmarshal input1.wav and input2.wav.
	wav.Unmarshal(i1, a)
	wav.Unmarshal(i2, b)

	// Add input2.wav to input1.wav.
	c, _ := wav.New(a.SamplesPerSec(), a.BitsPerSample(), a.Channels())
	io.Copy(c, a)
	io.Copy(c, b)

	// Marshal input1.wav and save result.
	file, _ := wav.Marshal(c)
	ioutil.WriteFile("output.wav", file, 0644)
}