Squash merge audio-player-component into main

backend/metadata/decoder.go

@@ -0,0 +1,36 @@
+// Package metadata handles audio file decoding and metadata extraction.
+package metadata
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/TheCodeOfCaleb/beep/v2"
+	"github.com/TheCodeOfCaleb/beep/v2/flac"
+	"github.com/TheCodeOfCaleb/beep/v2/mp3"
+	"github.com/TheCodeOfCaleb/beep/v2/vorbis"
+	"github.com/TheCodeOfCaleb/beep/v2/wav"
+)
+
+// ErrUnsupportedFileType is returned when the audio file type is not supported.
+var ErrUnsupportedFileType = errors.New("unsupported file type")
+
+// DecodeFile decodes an audio file into a stream seeker and format.
+func DecodeFile(f *os.File) (beep.StreamSeekCloser, beep.Format, error) {
+	ext := filepath.Ext(f.Name())
+
+	switch ext {
+	case ".mp3":
+		return mp3.Decode(f)
+	case ".flac":
+		return flac.Decode(f)
+	case ".ogg":
+		return vorbis.Decode(f)
+	case ".wav":
+		return wav.Decode(f)
+	default:
+		return nil, beep.Format{}, fmt.Errorf("%w: %s", ErrUnsupportedFileType, ext)
+	}
+}