How to concatenate several wav files?

[olebedev]

I do it in this way:

func concat(files [][]byte) ([]byte, error) {
    if len(files) == 1 {
        return files[0], nil
    }

    r, err := wav.NewReader(bytes.NewReader(files[0]), int64(len(files[0])))
    if err != nil {
        return nil, err
    }

    // create virtual fs
    fs := memfs.Create()
    tmp, err := fs.OpenFile("/tmp.wav", os.O_RDWR|os.O_CREATE, 0777)
    n, err := tmp.Write(files[0]) // hack to expand the capacity, needs for memfs
    if err != nil {
        return nil, err
    }
    if n != len(files[0]) {
        return nil, errors.New("writing failure")
    }

    if err != nil {
        return nil, err
    }
    defer tmp.Close()

    file := r.GetFile()
    w, err := file.NewWriter(tmp)
    if err != nil {
        return nil, err
    }

    writer, _, err := w.GetDumbWriter()
    if err != nil {
        return nil, err
    }

    // copy first file
    firstReader, err := r.GetDumbReader()
    if err != nil {
        return nil, err
    }

    io.Copy(writer, firstReader)
    // only first file, for debugging
    // for _, chunk := range files[1:] {
    // copy others chunks
    // }

    w.Close()
    tmp.Seek(0, os.SEEK_SET)
    b, err := ioutil.ReadAll(tmp)
    return b, err
}

But the headers of files are different. What I am doing wrong? Thanks.

---

Input file: - https://yadi.sk/d/PJE8hfxRrHnVB
Output file: - https://yadi.sk/d/B8q1PBrTrHnVK

[cryptix]

Sorry.. I somehow didn't get an email notification for this issue.

I'll look into it and reply once I have an idea.

[cryptix]

Sorry about this falling into oblivion.. Do you still need my insight here or did you solve it already?

[olebedev]

Oh, I solved the problem via operating over mp3 files instead. No need more. Thank you.