I was trying to clone discord and i found out they use ogg formats for audio (i think), im trying to get the audio duration to store in the database.

A stackoverflow solution about getting the OGG audio duration, i found fascinating. The approach involves seeking to the end of the file, finding the last Ogg page header, and reading its granule position.

func getOggDurationMs(reader io.Reader) (int64, error) {
    // Read the entire Ogg file into a byte slice
    data, err := io.ReadAll(reader)
    if err != nil {
        return 0, fmt.Errorf("error reading Ogg file: %w", err)
    }

    // Search for the "OggS" signature and calculate the length
    var length int64
    for i := len(data) - 14; i >= 0 && length == 0; i-- {
        if data[i] == 'O' && data[i 1] == 'g' && data[i 2] == 'g' && data[i 3] == 'S' {
            length = int64(readLittleEndianInt(data[i 6 : i 14]))
        }
    }

    // Search for the "vorbis" signature and calculate the rate
    var rate int64
    for i := 0; i 



I decided to share it here, i just found the implementation very cool and maybe help some other people out