feat: complte media store

backend/common/media_store/store.go

@@ -14,7 +14,24 @@ type Store []VideoInfo
 type VideoInfo struct {
 	Hash     string
 	Name     string
-	Duration uint
+	Duration int64
+}
+
+// Price
+func (info VideoInfo) Price() int64 {
+	min := int64(10)
+	// if duration is less than 300 seconds, return 10
+	if info.Duration < 5*60 {
+		return min * 100
+	}
+
+	// 每多一分钟，价格加 3， 如果余数大于 30 秒，按一分钟计算
+	cells := (info.Duration - 5*30) / 60
+	if info.Duration%60 > 30 {
+		cells++
+	}
+
+	return (min + cells*3) * 100
 }
 
 func NewStore(path string) (Store, error) {