add broken positioning code für vtt

1 files changed, 80 insertions, 0 deletions

diff --git a/web/script/player/track/vtt.ts b/web/script/player/track/vtt.ts
new file mode 100644
index 0000000..c426fa1
--- /dev/null
+++ b/web/script/player/track/vtt.ts
@@ -0,0 +1,80 @@
+import { SourceTrack, JvttCue } from "../jhls.d.ts";
+import { Player } from "../player.ts";
+import { PlayerTrack } from "./mod.ts";
+
+export async function create_vtt_track(player: Player, node_id: string, track_index: number, metadata: SourceTrack): Promise<VttPlayerTrack | undefined> {
+  let index: JvttCue[];
+  try {
+    const res = await fetch(`/n/${encodeURIComponent(player.node_id)}/stream?format=jvtt&tracks=${track_index}`, { headers: { "Accept": "application/json" } });
+    if (!res.ok) return player.error.value = "Cannot download index.", undefined;
+    let ai!: JvttCue[] & { error: string; };
+    try { ai = await res.json(); }
+    catch (_) { player.set_pers("Error: Failed to fetch node"); }
+    if (ai.error) return player.set_pers("server error: " + ai.error), undefined;
+    index = ai;
+  } catch (e) {
+    if (e instanceof TypeError) {
+      player.set_pers("Cannot download subtitles: Network Error");
+      return undefined
+    } else throw e;
+  }
+  const t = new VttPlayerTrack(player, node_id, track_index, metadata, index);
+  return t;
+}
+
+export class VttPlayerTrack extends PlayerTrack {
+  private track: TextTrack;
+
+  constructor(
+    private player: Player,
+    private node_id: string,
+    track_index: number,
+    private metadata: SourceTrack,
+    public cues: JvttCue[]
+  ) {
+    super(track_index);
+    this.track = this.player.video.addTextTrack("subtitles", metadata.name, metadata.language);
+    for (const cue of cues) {
+      this.track.addCue(create_cue(cue));
+    }
+    this.track.mode = "showing";
+    this.abort.signal.addEventListener("abort", () => {
+      // TODO disable subtitles properly
+      this.track.mode = "hidden";
+    });
+  }
+}
+
+function create_cue(cue: JvttCue): VTTCue {
+  const c = new VTTCue(cue.start, cue.end, cue.content);
+  const props = parse_layout_properties(cue.content.split("\n")[0])
+  if (props) {
+    c.text = cue.content.split("\n").slice(1).join("\n")
+    // TODO this does not work at all...
+    const region = new VTTRegion()
+    if ("position" in props && props.position.endsWith("%"))
+      region.regionAnchorX = parseFloat(props.position.replace("%", ""))
+    if ("line" in props && props.line.endsWith("%"))
+      region.regionAnchorY = parseFloat(props.line.replace("%", ""))
+    if ("align" in props)
+      c.align = props.align as AlignSetting
+    c.region = region
+  } else {
+    c.line = -2;
+  }
+  return c
+}
+
+function parse_layout_properties(s: string): undefined | Record<string, string> {
+  const o: Record<string, string> = {}
+  for (const tok of s.split(" ")) {
+    const [k, v, ...rest] = tok.split(":")
+    if (!v || rest.length) return undefined
+    o[k] = v
+  }
+  // some common keys to prevent false positives
+  if ("position" in o) return o
+  if ("align" in o) return o
+  if ("line" in o) return o
+  return undefined
+}