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camera.go
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camera.go
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package main
import (
"bytes"
"os"
"os/exec"
"path"
"sync"
"time"
)
type Camera struct {
cachedFrame *Frame
m sync.RWMutex
}
func NewCamera() *Camera {
return &Camera{
cachedFrame: nil,
m: sync.RWMutex{},
}
}
type Frame struct {
bytes []byte
created time.Time
}
func (c *Camera) GetFrame() (*Frame, error) {
if c.cachedFrame == nil || c.cachedFrame.created.Before(time.Now().Add(time.Minute*-1)) {
err := c.updateFrame()
if err != nil {
return nil, err
}
}
c.m.RLock()
defer c.m.RUnlock()
return &Frame{
bytes: bytes.Clone(c.cachedFrame.bytes),
created: c.cachedFrame.created,
}, nil
}
func (c *Camera) updateFrame() error {
tdir, err := os.MkdirTemp("", "*")
if err != nil {
return err
}
defer os.RemoveAll(tdir)
mp4Path := path.Join(tdir, "frame.mp4")
_, err = exec.Command("wget", "http://frigate:1984/api/frame.mp4?src=house", "-O", mp4Path).CombinedOutput()
//println(string(output))
if err != nil {
return err
}
jpgPath := path.Join(tdir, "frame.jpg")
_, err = exec.Command("ffmpeg", "-ss", "00:00", "-i", mp4Path, "-vframes", "1", "-q:v", "2", "-update", "1", jpgPath).CombinedOutput()
//println(string(output))
if err != nil {
return err
}
jpgBytes, err := os.ReadFile(jpgPath)
if err != nil {
return err
}
c.m.Lock()
defer c.m.Unlock()
c.cachedFrame = &Frame{
bytes: jpgBytes,
created: time.Now(),
}
return nil
}