Function scheduleWebAudioForActiveClips

packages/core/src/runtime/init.ts:2620–2663

()

  // same edge as the HTMLMedia path. Reused by play() and by the rate-change
  // handler (a rate change can't rescale a bounded source in place).
  const scheduleWebAudioForActiveClips = () => {
    if (state.nativeMediaSyncDisabled || state.webAudioMediaDisabled) return;
    const gen = webAudio.startGeneration();
    const audioEls = document.querySelectorAll("audio[data-start]");
    for (const rawEl of audioEls) {
      if (!(rawEl instanceof HTMLMediaElement) || !rawEl.isConnected) continue;
      const compStart = Number.parseFloat(rawEl.dataset.start ?? "");
      if (!Number.isFinite(compStart)) continue;
      const mediaStart =
        Number.parseFloat(rawEl.dataset.playbackStart ?? rawEl.dataset.mediaStart ?? "0") || 0;
      const volumeAttr = Number.parseFloat(rawEl.dataset.volume ?? "");
      const vol = Number.isFinite(volumeAttr) ? volumeAttr : 1;
      const durationAttr = Number.parseFloat(rawEl.dataset.duration ?? "");
      let clipDuration =
        Number.isFinite(durationAttr) && durationAttr > 0 ? durationAttr : Number.POSITIVE_INFINITY;
      const compositionRoot = rawEl.closest("[data-composition-id]");
      if (compositionRoot) {
        const inheritedStart = resolveStartForElement(compositionRoot, 0);
        const inheritedDuration = resolveDurationForElement(compositionRoot, {
          includeAuthoredTimingAttrs: true,
        });
        if (inheritedDuration != null && inheritedDuration > 0) {
          clipDuration = Math.min(
            clipDuration,
            Math.max(0, inheritedStart + inheritedDuration - compStart),
          );
        }
      }
      void webAudio.decodeAudioElement(rawEl).then((buffer) => {
        if (!buffer || !clock.isPlaying()) return;
        void webAudio.schedulePlayback(
          rawEl,
          buffer,
          compStart,
          mediaStart,
          clock.now(),
          vol * state.bridgeVolume,
          gen,
          state.playbackRate,
          clipDuration,
        );
      });
    }
  };

  // Apply a new playback rate to the WebAudio transport. Unbounded sources are
  // rescaled in place; but a bounded source's window was baked into start()'s