init: dec-music 项目初始化

decrypt/raw.go

@@ -0,0 +1,50 @@
+package decrypt
+
+import (
+	"errors"
+	"fmt"
+	"io"
+
+	"jsuse.com/dev/dec-music/internal/sniff"
+)
+
+type rawDecoder struct {
+	rd io.ReadSeeker
+
+	audioExt string
+}
+
+func newRawDecoder(p *DecoderParams) Decoder {
+	return &rawDecoder{rd: p.Reader}
+}
+
+func (d *rawDecoder) Validate() error {
+	header := make([]byte, 16)
+	if _, err := io.ReadFull(d.rd, header); err != nil {
+		return fmt.Errorf("read file header failed: %v", err)
+	}
+	if _, err := d.rd.Seek(0, io.SeekStart); err != nil {
+		return fmt.Errorf("seek file failed: %v", err)
+	}
+
+	var ok bool
+	d.audioExt, ok = sniff.AudioExtension(header)
+	if !ok {
+		return errors.New("raw: sniff audio type failed")
+	}
+	return nil
+}
+
+func (d *rawDecoder) Read(p []byte) (n int, err error) {
+	return d.rd.Read(p)
+}
+
+func init() {
+	RegisterDecoder("mp3", true, newRawDecoder)
+	RegisterDecoder("flac", true, newRawDecoder)
+	RegisterDecoder("ogg", true, newRawDecoder)
+	RegisterDecoder("m4a", true, newRawDecoder)
+	RegisterDecoder("wav", true, newRawDecoder)
+	RegisterDecoder("wma", true, newRawDecoder)
+	RegisterDecoder("aac", true, newRawDecoder)
+}