添加对外挂字幕的支持

添加对字幕的支持

internal/service/subtitle_test.go

@@ -1,6 +1,8 @@
 package service
 
 import (
+	"bytes"
+	"os"
 	"path/filepath"
 	"testing"
 
@@ -42,3 +44,54 @@ func TestSubtitleDiscoverNoTracksReturnsEmptySlice(t *testing.T) {
 		t.Fatalf("len(tracks) = %d, want 0", len(tracks))
 	}
 }
+
+func TestNormaliseTimecode(t *testing.T) {
+	cases := map[string]string{
+		"0:00:01":      "00:00:01",
+		"0:00:01.51":   "00:00:01.510", // ASS centiseconds -> 3-digit ms
+		"0:00:04.123":  "00:00:04.123", // already 3 digits
+		"00:00:12.07":  "00:00:12.070", // 2-digit fraction padded
+		"00:01:30.1234": "00:01:30.123", // capped at 3 digits
+		"00:00:1.5":    "00:00:01.500", // single-digit seconds and fraction
+	}
+	for in, want := range cases {
+		if got := normaliseTimecode(in); got != want {
+			t.Errorf("normaliseTimecode(%q) = %q, want %q", in, got, want)
+		}
+	}
+}
+
+func TestSubtitleServeRawWritesSourceBytes(t *testing.T) {
+	db, err := gorm.Open(sqlite.Open("file::memory:?cache=shared"), &gorm.Config{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := db.AutoMigrate(&model.Library{}, &model.Media{}); err != nil {
+		t.Fatal(err)
+	}
+
+	dir := t.TempDir()
+	videoPath := filepath.Join(dir, "MovieName.mkv")
+	subPath := filepath.Join(dir, "MovieName.ass")
+	raw := "Dialogue: 0,0:00:01.00,0:00:02.00,Default,,0,0,0,,線合なライン\n"
+	if err := os.WriteFile(videoPath, []byte("video"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	if err := os.WriteFile(subPath, []byte(raw), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	media := model.Media{Title: "MovieName", Path: videoPath}
+	if err := db.Create(&media).Error; err != nil {
+		t.Fatal(err)
+	}
+
+	svc := NewSubtitleService(zap.NewNop(), repository.New(db))
+	var buf bytes.Buffer
+	if err := svc.ServeRaw(t.Context(), media.ID, subPath, &buf); err != nil {
+		t.Fatal(err)
+	}
+	// ServeRaw must NOT convert ASS->VTT; it returns the exact source bytes.
+	if got := buf.String(); got != raw {
+		t.Fatalf("ServeRaw returned %q, want raw %q", got, raw)
+	}
+}