commit ee2780583f31e49871e97f87bb4b5ea087d00049
Author: ugrnm <ultrageranium@bleu255.com>
Date: Fri, 13 Sep 2024 14:58:12 +0200
proof of concept
Diffstat:
7 files changed, 114 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1,3 @@
+go.sum
+www/tv.jpg
+tv
diff --git a/README b/README
@@ -0,0 +1,16 @@
+television
+==========
+
+A simple LAN/WLAN screen public broadcasting service.
+
+
+build
+-----
+
+blablabla
+
+
+usage
+-----
+
+blablabla
diff --git a/go.mod b/go.mod
@@ -0,0 +1,16 @@
+module television
+
+go 1.22
+
+require (
+ github.com/kbinani/screenshot v0.0.0-20240820160931-a8a2c5d0e191
+ github.com/pixiv/go-libjpeg v0.0.0-20190822045933-3da21a74767d
+)
+
+require (
+ github.com/gen2brain/shm v0.1.0 // indirect
+ github.com/godbus/dbus/v5 v5.1.0 // indirect
+ github.com/jezek/xgb v1.1.1 // indirect
+ github.com/lxn/win v0.0.0-20210218163916-a377121e959e // indirect
+ golang.org/x/sys v0.24.0 // indirect
+)
diff --git a/tv.go b/tv.go
@@ -0,0 +1,51 @@
+package main
+
+import (
+ "os"
+ "log"
+ "time"
+ "net/http"
+ "github.com/kbinani/screenshot"
+ "github.com/pixiv/go-libjpeg/jpeg"
+)
+
+func snap() {
+
+ for {
+
+ img, err := screenshot.CaptureDisplay(0)
+ if err != nil {
+ panic(err)
+ }
+
+ fileName := "www/tv.jpg.tmp"
+ file, _ := os.Create(fileName)
+ defer file.Close()
+
+ jpeg.Encode(file, img, &jpeg.EncoderOptions{
+ Quality: 50,
+ OptimizeCoding: false,
+ ProgressiveMode: false,
+ DCTMethod: jpeg.DCTIFast})
+
+ os.Rename(fileName, "www/tv.jpg")
+
+ log.Println("screenshot taken")
+
+ time.Sleep(1000 * time.Millisecond)
+
+ }
+}
+
+func main() {
+
+ go snap()
+
+ log.Println("we're live!")
+ log.Println("ctrl-c for emergency shutdown")
+
+ http.Handle("/", http.FileServer(http.Dir("www")))
+ http.ListenAndServe(":8888", nil)
+
+}
+
diff --git a/www/index.html b/www/index.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+ <head>
+ <meta charset="UTF-8">
+ <title>television</title>
+ <link rel="stylesheet" href="/style.css">
+ <script src="/tv.js"></script>
+ </head>
+ <body>
+ <img id="television" src="/tv.jpg" alt="television">
+ </body>
+</html>
+
diff --git a/www/style.css b/www/style.css
@@ -0,0 +1,3 @@
+img {
+ width: 100%;
+}
diff --git a/www/tv.js b/www/tv.js
@@ -0,0 +1,12 @@
+// Fetch a new tv.jpg every second
+// In theory, fetch() combined with a "no-store" cache directive should be
+// enough, and it is fine on some browsers like chromium. However on firefox
+// even though the file is effectly re-downloaded and not put in cache,
+// the browser does not refresh the image. To force refresh it we have to
+// update its src with bogus URL crap. Great.
+//
+setInterval(function(){
+ fetch("/tv.jpg", { cache: "no-store", mode: "no-cors" });
+ document.getElementById("television").src="/tv.jpg#" + Date.now();
+}, 1000);
+
