From 1bd9fac203f09736c1225bbbe19e5d7cc31c0b93 Mon Sep 17 00:00:00 2001
From: Maze <mazewinther@gmail.com>
Date: Sun, 5 Apr 2026 13:15:58 +0200
Subject: refactor: rewrite animation system to use bindings and scalar
 channels

---
 .../web/src/lib/timeline/audio-separation/index.ts | 56 +++++++++++-----------
 1 file changed, 28 insertions(+), 28 deletions(-)

(limited to 'apps/web/src/lib/timeline/audio-separation/index.ts')

diff --git a/apps/web/src/lib/timeline/audio-separation/index.ts b/apps/web/src/lib/timeline/audio-separation/index.ts
index b92cb79b..fc0ead2d 100644
--- a/apps/web/src/lib/timeline/audio-separation/index.ts
+++ b/apps/web/src/lib/timeline/audio-separation/index.ts
@@ -1,4 +1,4 @@
-import { cloneAnimations, getChannel } from "@/lib/animation";
+import { cloneAnimations } from "@/lib/animation";
 import type { ElementAnimations } from "@/lib/animation/types";
 import type { MediaAsset } from "@/lib/media/types";
 import { DEFAULTS } from "@/lib/timeline/defaults";
@@ -25,13 +25,10 @@ export function isSourceAudioSeparated({
 	return !isSourceAudioEnabled({ element });
 }
 
-export function canExtractSourceAudio({
-	element,
-	mediaAsset,
-}: {
-	element: TimelineElement;
-	mediaAsset: MediaAsset | null | undefined;
-}): element is VideoElement {
+export function canExtractSourceAudio(
+	element: TimelineElement,
+	mediaAsset: MediaAsset | null | undefined,
+): element is VideoElement {
 	return (
 		element.type === "video" &&
 		isSourceAudioEnabled({ element }) &&
@@ -40,25 +37,17 @@ export function canExtractSourceAudio({
 	);
 }
 
-export function canRecoverSourceAudio({
-	element,
-}: {
-	element: TimelineElement;
-}): element is VideoElement {
+export function canRecoverSourceAudio(
+	element: TimelineElement,
+): element is VideoElement {
 	return element.type === "video" && isSourceAudioSeparated({ element });
 }
 
-export function canToggleSourceAudio({
-	element,
-	mediaAsset,
-}: {
-	element: TimelineElement;
-	mediaAsset: MediaAsset | null | undefined;
-}): element is VideoElement {
-	return (
-		canRecoverSourceAudio({ element }) ||
-		canExtractSourceAudio({ element, mediaAsset })
-	);
+export function canToggleSourceAudio(
+	element: TimelineElement,
+	mediaAsset: MediaAsset | null | undefined,
+): element is VideoElement {
+	return canRecoverSourceAudio(element) || canExtractSourceAudio(element, mediaAsset);
 }
 
 export function doesElementHaveEnabledAudio({
@@ -117,16 +106,27 @@ function cloneVolumeAnimations({
 }: {
 	animations: ElementAnimations | undefined;
 }): ElementAnimations | undefined {
-	const volumeChannel = getChannel({ animations, propertyPath: "volume" });
-	if (!volumeChannel) {
+	const volumeBinding = animations?.bindings.volume;
+	if (!volumeBinding) {
+		return undefined;
+	}
+
+	const subsetChannels = Object.fromEntries(
+		volumeBinding.components.flatMap((component) => {
+			const channel = animations?.channels[component.channelId];
+			return channel ? [[component.channelId, channel] as const] : [];
+		}),
+	);
+	if (Object.keys(subsetChannels).length === 0) {
 		return undefined;
 	}
 
 	return cloneAnimations({
 		animations: {
-			channels: {
-				volume: volumeChannel,
+			bindings: {
+				volume: volumeBinding,
 			},
+			channels: subsetChannels,
 		},
 		shouldRegenerateKeyframeIds: true,
 	});
-- 
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