♻️ refactor: split src into internal packages and cmd

internal/tsf/container.go

@@ -0,0 +1,52 @@
+// .tsf layout, little-endian: "TSFR" | version uint16 | fps float64 |
+// count uint32 | count × (colorLen uint32, color JPEG).
+package tsf
+
+import "sync"
+
+const (
+	tsfMagic         = "TSFR"
+	tsfVersion       = 1
+	maxTSFFPS        = 240
+	maxTSFFrameCount = 10_000_000
+)
+
+type FramesContainer struct {
+	ColorFrames [][]byte
+	FPS         float64
+	Name        string
+}
+
+type frameFile struct {
+	data    []byte
+	cleanup func() error
+	once    sync.Once
+	err     error
+}
+
+func (f *frameFile) Close() error {
+	if f == nil {
+		return nil
+	}
+	f.once.Do(func() {
+		if f.cleanup != nil {
+			f.err = f.cleanup()
+		}
+		f.data = nil
+	})
+	return f.err
+}
+
+var frameFileOwners sync.Map // map[*FramesContainer]*frameFile
+
+func (data *FramesContainer) Close() error {
+	if data == nil {
+		return nil
+	}
+	owner, ok := frameFileOwners.LoadAndDelete(data)
+	if !ok {
+		return nil
+	}
+	data.ColorFrames = nil
+	return owner.(*frameFile).Close()
+}