imagegowebp

WebP encoder/decoder in go


Is there somewhere a complete WebP encoder and decoder compatible with current weekly (or forkable)?

Is it comparable in speed to the standard png one ?


Solution

  • There is a package by this guy on GitHub that includes both an encoder and a decoder for WebP: https://github.com/chai2010/webp

    From the readme file:

    package main
    
    import (
        "bytes"
        "fmt"
        "io/ioutil"
        "log"
    
        "github.com/chai2010/webp"
    )
    
    func main() {
        var buf bytes.Buffer
        var width, height int
        var data []byte
        var err error
    
        // Load file data
        if data, err = ioutil.ReadFile("./testdata/1_webp_ll.webp"); err != nil {
            log.Println(err)
        }
    
        // GetInfo
        if width, height, _, err = webp.GetInfo(data); err != nil {
            log.Println(err)
        }
        fmt.Printf("width = %d, height = %d\n", width, height)
    
        // GetMetadata
        if metadata, err := webp.GetMetadata(data, "ICCP"); err != nil {
            fmt.Printf("Metadata: err = %v\n", err)
        } else {
            fmt.Printf("Metadata: %s\n", string(metadata))
        }
    
        // Decode webp
        m, err := webp.Decode(bytes.NewReader(data))
        if err != nil {
            log.Println(err)
        }
    
        // Encode lossless webp
        if err = webp.Encode(&buf, m, &webp.Options{Lossless: true}); err != nil {
            log.Println(err)
        }
        if err = ioutil.WriteFile("output.webp", buf.Bytes(), 0666); err != nil {
            log.Println(err)
        }
    }