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timelapse.go
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timelapse.go
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package main
import (
"errors"
"fmt"
"io"
"os"
"os/exec"
"path"
"path/filepath"
"sync"
"time"
)
const (
framesDir = "/service/data/frames"
lapseDir = "/service/data/lapse"
)
type Timelapse struct {
c *Camera
m sync.RWMutex
}
func NewTimelapse(c *Camera) (*Timelapse, error) {
err := os.MkdirAll(lapseDir, os.ModeDevice)
if err != nil {
return nil, err
}
err = os.MkdirAll(framesDir, os.ModeDevice)
if err != nil {
return nil, err
}
return &Timelapse{
c: c,
m: sync.RWMutex{},
}, nil
}
func (t *Timelapse) saveFrame() error {
if time.Now().Hour() < 7 || time.Now().Hour() > 16 {
println("skipping saving new frame")
return nil
}
frame, err := t.c.GetFrame()
if err != nil {
return err
}
t.m.Lock()
defer t.m.Unlock()
f, err := os.Create(path.Join(framesDir, fmt.Sprintf("%s.jpg", frame.created.Format(time.RFC3339))))
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(frame.bytes)
if err != nil {
return err
}
return nil
}
func (t *Timelapse) updateCompleteLapse() error {
glob := fmt.Sprintf("/service/data/frames/*.jpg")
err := t.updateLapse(glob, "complete.mp4", "10")
if err != nil {
return err
}
return nil
}
func (t *Timelapse) updateLatestLapse() error {
if time.Now().Hour() >= 20 {
println("skipping latest lapse update")
return nil
}
glob := fmt.Sprintf("/service/data/frames/%s*.jpg", time.Now().Format("2006-01-02"))
matches, err := filepath.Glob(glob)
if err != nil {
return err
}
if len(matches) == 0 {
return errors.New("no frames for date")
}
err = t.updateLapse(glob, fmt.Sprintf("%s.mp4", time.Now().Format("2006-01-02")), "2")
if err != nil {
return err
}
return nil
}
func (t *Timelapse) updateLapse(filter, lapseName, fps string) error {
tdir, err := os.MkdirTemp("", "*")
if err != nil {
return err
}
defer os.RemoveAll(tdir)
lapseTmpPath := path.Join(tdir, lapseName)
_, err = exec.Command("ffmpeg", "-framerate", fps, "-pattern_type", "glob", "-i", filter, "-s:v", "1920x1080", "-c:v", "libx264", "-crf", "25", "-pix_fmt", "yuv420p", lapseTmpPath).CombinedOutput()
if err != nil {
return err
}
t.m.Lock()
defer t.m.Unlock()
lapsePath := path.Join(lapseDir, lapseName)
os.Remove(lapsePath)
src, err := os.Open(lapseTmpPath)
if err != nil {
return err
}
defer src.Close()
dst, err := os.Create(lapsePath)
if err != nil {
return err
}
defer dst.Close()
_, err = io.Copy(dst, src)
if err != nil {
return err
}
fi, err := os.Stat(lapseTmpPath)
if err != nil {
return err
}
err = os.Chmod(lapsePath, fi.Mode())
if err != nil {
return err
}
os.Remove(lapseTmpPath)
return nil
}