feat(uploads): match release groups with MusicBrainz and AcoustID

services/api/internal/library/fingerprint.go

@@ -79,6 +79,37 @@ type FPCalc struct {
 	Timeout time.Duration
 }
 
+// EncodedFingerprint returns compressed Chromaprint for AcoustID. Use ffprobe for full duration.
+func (f FPCalc) EncodedFingerprint(ctx context.Context, absPath string) (string, error) {
+	bin := f.Bin
+	if bin == "" {
+		bin = "fpcalc"
+	}
+	timeout := f.Timeout
+	if timeout <= 0 {
+		timeout = time.Minute
+	}
+	ctx, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+	out, err := exec.CommandContext(ctx, bin, "-json", "-length", fmt.Sprint(FingerprintSeconds), "--", absPath).Output()
+	if err != nil {
+		if errors.Is(err, exec.ErrNotFound) {
+			return "", ErrNoFPCalc
+		}
+		return "", fmt.Errorf("fpcalc: encoded fingerprint: %w", err)
+	}
+	var result struct {
+		Fingerprint string `json:"fingerprint"`
+	}
+	if err = json.Unmarshal(out, &result); err != nil {
+		return "", err
+	}
+	if len(result.Fingerprint) == 0 || len(result.Fingerprint) > 65536 || strings.ContainsAny(result.Fingerprint, " \t\r\n") {
+		return "", errors.New("fpcalc: invalid encoded fingerprint")
+	}
+	return result.Fingerprint, nil
+}
+
 // ErrNoFPCalc — fpcalc не установлен: отпечатки Chromaprint не считаются.
 var ErrNoFPCalc = errors.New("library: fpcalc not found")
 

services/api/internal/library/probe.go

@@ -34,6 +34,7 @@ type Probe struct {
 	Channels   int
 	DurationMs int
 	Tags       meta.Fields
+	RawTags    map[string]string
 }
 
 // Lossless сообщает, без потерь ли кодек.
@@ -160,6 +161,7 @@ func parseFFprobe(raw []byte, name string) (Probe, error) {
 		Track:       first("track", "tracknumber"),
 		Disc:        first("disc", "discnumber"),
 	}
+	p.RawTags = tags
 	return p, nil
 }
 

services/api/internal/library/probe_identifiers_test.go

@@ -0,0 +1,15 @@
+package library
+
+import (
+	"github.com/stretchr/testify/require"
+	"testing"
+)
+
+func TestProbeKeepsMusicBrainzIdentifiersForUploadLookup(t *testing.T) {
+	raw := []byte(`{"streams":[{"codec_type":"audio","codec_name":"flac","sample_rate":"44100","duration":"180","tags":{"MusicBrainz Track Id":"recording-id"}}],"format":{"tags":{"ARTIST":"Artist","ALBUM":"Album","TITLE":"Song","MusicBrainz Album Id":"release-id"}}}`)
+	probe, err := parseFFprobe(raw, "song.flac")
+	require.NoError(t, err)
+	require.Equal(t, "release-id", probe.RawTags["musicbrainz album id"])
+	require.Equal(t, "recording-id", probe.RawTags["musicbrainz track id"])
+	require.Equal(t, "Song", probe.Tags.Title)
+}