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package main | |
import ( | |
"bytes" | |
"fmt" | |
"io" | |
"log" | |
"mime/multipart" | |
"net/http" | |
"net/textproto" | |
"os" | |
"os/exec" | |
"os/signal" | |
"sync" | |
"syscall" | |
"time" | |
_ "time/tzdata" | |
"github.com/blackjack/webcam" | |
) | |
func main() { | |
logf, err := os.OpenFile( | |
"cam.log", | |
os.O_CREATE|os.O_RDWR|os.O_APPEND|os.O_SYNC, | |
0644, | |
) | |
if err != nil { | |
log.Fatal(err) | |
} | |
log.SetOutput(logf) | |
loc, err := time.LoadLocation("Europe/Riga") | |
if err != nil { | |
fmt.Fprintln(os.Stderr, err) | |
log.Fatal(err) | |
} | |
time.Local = loc | |
exes := []string{ | |
"convert", | |
"pidof", | |
} | |
for _, exe := range exes { | |
_, err := exec.LookPath(exe) | |
if err != nil { | |
fmt.Fprintln(os.Stderr, "dependency:", err) | |
log.Println("dependency:", err) | |
log.Fatal("cam: exited") | |
} | |
} | |
out, err := exec.Command("pidof", os.Args[0]).CombinedOutput() | |
if err != nil { | |
fmt.Fprintln(os.Stderr, err) | |
log.Fatalf("pidof: %v, %s\n", err, out) | |
} | |
arr := bytes.Split(out, []byte(" ")) | |
if len(arr) > 1 { | |
log.Fatal("cam: already running") | |
} | |
log.Println("cam: launched") | |
sig := make(chan os.Signal, 1) | |
signal.Notify( | |
sig, syscall.SIGINT, syscall.SIGTERM, //syscall.SIGHUP, | |
) | |
go func() { | |
s := <-sig | |
log.Println("cam:", s) | |
os.Exit(0) | |
}() | |
var c cam | |
go func() { | |
w, err := webcam.Open("/dev/video0") | |
if err != nil { | |
log.Fatal(err) | |
} | |
fmt.Println(w.GetSupportedFormats()) | |
_, _, _, err = w.SetImageFormat(1196444237, 1280, 720) | |
if err != nil { | |
log.Fatal(err) | |
} | |
err = w.StartStreaming() | |
if err != nil { | |
log.Fatal(err) | |
} | |
ticker := time.NewTicker(time.Second * 5) | |
for { | |
err = w.WaitForFrame(1000) | |
if err != nil { | |
log.Fatal(err) | |
} | |
select { | |
case <-ticker.C: | |
buffer, id, err := w.GetFrame() | |
if err != nil { | |
log.Fatal(err) | |
} | |
now := time.Now() | |
cmd := exec.Command( | |
"magick", | |
"-", | |
"-quality", "90", | |
"-pointsize", "30", | |
"-font", "Ubuntu-Mono", | |
"-undercolor", "white", | |
"-annotate", "+10+30", now.Format(time.DateTime+" MST"), | |
"jpeg:-") | |
cmd.Stdin = bytes.NewBuffer(buffer) | |
stderr := bytes.NewBuffer(nil) | |
cmd.Stderr = stderr | |
out, err := cmd.Output() | |
if err != nil { | |
log.Fatal(err, stderr) | |
} | |
c.mu.Lock() | |
c.currentimg = out | |
c.timestamp = time.Now().UnixNano() | |
c.mu.Unlock() | |
w.ReleaseFrame(id) | |
default: | |
_, id, err := w.GetFrame() | |
if err != nil { | |
log.Fatal(err) | |
} | |
w.ReleaseFrame(id) | |
} | |
} | |
}() | |
mux := http.NewServeMux() | |
mux.Handle("/live", &c) | |
err = http.ListenAndServe(":9999", mux) | |
log.Println(err) | |
log.Fatal("cam: exited") | |
} | |
type cam struct { | |
currentimg []byte | |
timestamp int64 | |
mu sync.RWMutex | |
} | |
func (c *cam) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
mw := multipart.NewWriter(w) | |
ct := fmt.Sprintf( | |
"multipart/x-mixed-replace;boundary=%s", mw.Boundary(), | |
) | |
w.Header().Add("Content-Type", ct) | |
w.Header().Set("Cache-Control", "no-cache") | |
if r.Method == http.MethodHead { | |
w.WriteHeader(http.StatusOK) | |
return | |
} | |
if r.Method != http.MethodGet { | |
w.WriteHeader(http.StatusMethodNotAllowed) | |
return | |
} | |
ip := r.Header.Get("X-Real-IP") | |
log.Printf("cam: accessd (%s)", ip) | |
now := time.Now() | |
defer func() { | |
log.Printf("cam: watched [%s] (%s)", time.Since(now), ip) | |
}() | |
var img []byte | |
var err error | |
var writer io.Writer | |
header := make(textproto.MIMEHeader) | |
header.Add("Content-Type", "image/jpeg") | |
for { | |
c.mu.RLock() | |
if c.currentimg != nil { | |
c.mu.RUnlock() | |
break | |
} | |
c.mu.RUnlock() | |
time.Sleep(time.Millisecond * 100) | |
} | |
var previous int64 | |
for { | |
c.mu.RLock() | |
if previous == c.timestamp { | |
c.mu.RUnlock() | |
time.Sleep(time.Millisecond * 100) | |
continue | |
} | |
previous = c.timestamp | |
img = c.currentimg | |
c.mu.RUnlock() | |
for range 3 { | |
writer, err = mw.CreatePart(header) | |
if err != nil { | |
return | |
} | |
_, err = writer.Write(img) | |
if err != nil { | |
return | |
} | |
} | |
} | |
} |
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