Add Decoder Registry

Add Raw Decoder

algo/common/dispatch.go

@@ -0,0 +1,12 @@
+package common
+
+type NewDecoderFunc func([]byte) Decoder
+
+var decoderRegistry = make(map[string][]NewDecoderFunc)
+
+func RegisterDecoder(ext string, dispatchFunc NewDecoderFunc) {
+	decoderRegistry[ext] = append(decoderRegistry[ext], dispatchFunc)
+}
+func GetDecoder(ext string) []NewDecoderFunc {
+	return decoderRegistry[ext]
+}

algo/common/raw.go

@@ -0,0 +1,41 @@
+package common
+
+type RawDecoder struct {
+	file []byte
+}
+
+func NewRawDecoder(file []byte) Decoder {
+	return &RawDecoder{file: file}
+}
+
+func (d RawDecoder) Validate() error {
+	return nil
+}
+
+func (d RawDecoder) Decode() error {
+	return nil
+}
+
+func (d RawDecoder) GetCoverImage() []byte {
+	return nil
+}
+
+func (d RawDecoder) GetAudioData() []byte {
+	return d.file
+}
+
+func (d RawDecoder) GetAudioExt() string {
+	return ""
+}
+
+func (d RawDecoder) GetMeta() Meta {
+	return nil
+}
+
+func init() {
+	RegisterDecoder("mp3", NewRawDecoder)
+	RegisterDecoder("flac", NewRawDecoder)
+	RegisterDecoder("wav", NewRawDecoder)
+	RegisterDecoder("ogg", NewRawDecoder)
+	RegisterDecoder("m4a", NewRawDecoder)
+}