Calculating Ogg Audio Duration in Go: A Step-by-Step Guide

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 



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


          

            
        

The above is the detailed content of Calculating Ogg Audio Duration in Go: A Step-by-Step Guide. For more information, please follow other related articles on the PHP Chinese website!