Sergey Krashevich
ea03aa832d
- implement WebP streaming with multipart support - add snapshot endpoint for WebP format with quality options - introduce WebP encoding using pure Go library without FFmpeg - update documentation and links for new WebP features
39 lines
857 B
Go
39 lines
857 B
Go
package webp
|
|
|
|
import (
|
|
"io"
|
|
"net/http"
|
|
"strconv"
|
|
)
|
|
|
|
const header = "--frame\r\nContent-Type: image/webp\r\nContent-Length: "
|
|
|
|
// Writer writes multipart WebP frames to an HTTP response.
|
|
type Writer struct {
|
|
wr io.Writer
|
|
buf []byte
|
|
}
|
|
|
|
// NewWriter creates a Writer that sets the multipart Content-Type header.
|
|
func NewWriter(w io.Writer) *Writer {
|
|
h := w.(http.ResponseWriter).Header()
|
|
h.Set("Content-Type", "multipart/x-mixed-replace; boundary=frame")
|
|
return &Writer{wr: w, buf: []byte(header)}
|
|
}
|
|
|
|
func (w *Writer) Write(p []byte) (n int, err error) {
|
|
w.buf = w.buf[:len(header)]
|
|
w.buf = append(w.buf, strconv.Itoa(len(p))...)
|
|
w.buf = append(w.buf, "\r\n\r\n"...)
|
|
w.buf = append(w.buf, p...)
|
|
w.buf = append(w.buf, "\r\n"...)
|
|
|
|
if _, err = w.wr.Write(w.buf); err != nil {
|
|
return 0, err
|
|
}
|
|
|
|
w.wr.(http.Flusher).Flush()
|
|
|
|
return len(p), nil
|
|
}
|