init: dec-music 项目初始化

decrypt/interface.go

@@ -0,0 +1,14 @@
+package decrypt
+
+import "io"
+
+// StreamDecoder decrypts audio stream bytes in place.
+type StreamDecoder interface {
+	Decrypt(buf []byte, offset int)
+}
+
+// Decoder decrypts one encrypted media file.
+type Decoder interface {
+	Validate() error
+	io.Reader
+}