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main.go
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main.go
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package main
import (
"context"
"fmt"
"log"
"mime/multipart"
"net/http"
"net/textproto"
"os"
"github.com/vladimirvivien/go4vl/device"
"github.com/vladimirvivien/go4vl/v4l2"
)
var (
frames <-chan []byte
)
func main() {
port :=os.Getenv("PORT")
if port == "" {
port = "4040"
}
devName :=os.Getenv("DEV_NAME")
if devName == "" {
devName ="/dev/video0"
}
camera, err := device.Open(
devName,
device.WithPixFormat(v4l2.PixFormat{PixelFormat: v4l2.PixelFmtMJPEG, Width: 800, Height: 600}),
)
if err != nil {
log.Fatalf("failed to open device: %s", err)
}
defer camera.Close()
if err := camera.Start(context.TODO()); err != nil {
log.Fatalf("camera start: %s", err)
}
frames = camera.GetOutput()
http.HandleFunc("/stream", imageServ)
log.Fatal(http.ListenAndServe(":"+port, nil))
}
func imageServ(w http.ResponseWriter, req *http.Request) {
mimeWriter := multipart.NewWriter(w)
w.Header().Set("Content-Type", fmt.Sprintf("multipart/x-mixed-replace; boundary=%s", mimeWriter.Boundary()))
partHeader := make(textproto.MIMEHeader)
partHeader.Add("Content-Type", "image/jpeg")
var frame []byte
for frame = range frames {
partWriter, err := mimeWriter.CreatePart(partHeader)
if err != nil {
log.Printf("failed to create multi-part writer: %s", err)
return
}
if _, err := partWriter.Write(frame); err != nil {
log.Printf("failed to write image: %s", err)
}
}
}