From f1043734438c8518a302f698d9ae6583a75f0c14 Mon Sep 17 00:00:00 2001
From: cashmere <cashmere@autistici.org>
Date: Sun, 16 Aug 2026 06:16:56 +0200
Subject: feat: add transitions, track mixing, and voiceover controls

---
 apps/web/src/timeline/scenes.ts | 229 ++++++++++++++++++++--------------------
 1 file changed, 115 insertions(+), 114 deletions(-)

(limited to 'apps/web/src/timeline/scenes.ts')

diff --git a/apps/web/src/timeline/scenes.ts b/apps/web/src/timeline/scenes.ts
index 8aa1b6b5..155bda96 100644
--- a/apps/web/src/timeline/scenes.ts
+++ b/apps/web/src/timeline/scenes.ts
@@ -1,114 +1,115 @@
-import type { TScene } from "@/timeline";
-import { generateUUID } from "@/utils/id";
-import { calculateTotalDuration } from "@/timeline";
-import { MAIN_TRACK_NAME } from "@/timeline/placement/main-track";
-import { type MediaTime, ZERO_MEDIA_TIME } from "@/wasm";
-
-export function getMainScene({ scenes }: { scenes: TScene[] }): TScene | null {
-	return scenes.find((scene) => scene.isMain) || null;
-}
-
-export function ensureMainScene({ scenes }: { scenes: TScene[] }): TScene[] {
-	const hasMain = scenes.some((scene) => scene.isMain);
-	if (!hasMain) {
-		const mainScene = buildDefaultScene({ name: "Main scene", isMain: true });
-		return [mainScene, ...scenes];
-	}
-	return scenes;
-}
-
-export function buildDefaultScene({
-	name,
-	isMain,
-}: {
-	name: string;
-	isMain: boolean;
-}): TScene {
-	return {
-		id: generateUUID(),
-		name,
-		isMain,
-		tracks: {
-			overlay: [],
-			main: {
-				id: generateUUID(),
-				name: MAIN_TRACK_NAME,
-				type: "video",
-				elements: [],
-				muted: false,
-				hidden: false,
-			},
-			audio: [],
-		},
-		bookmarks: [],
-		createdAt: new Date(),
-		updatedAt: new Date(),
-	};
-}
-
-export function canDeleteScene({ scene }: { scene: TScene }): {
-	canDelete: boolean;
-	reason?: string;
-} {
-	if (scene.isMain) {
-		return { canDelete: false, reason: "Cannot delete main scene" };
-	}
-	return { canDelete: true };
-}
-
-export function getFallbackSceneAfterDelete({
-	scenes,
-	deletedSceneId,
-	currentSceneId,
-}: {
-	scenes: TScene[];
-	deletedSceneId: string;
-	currentSceneId: string | null;
-}): TScene | null {
-	if (currentSceneId !== deletedSceneId) {
-		return scenes.find((s) => s.id === currentSceneId) || null;
-	}
-	return getMainScene({ scenes });
-}
-
-export function findCurrentScene({
-	scenes,
-	currentSceneId,
-}: {
-	scenes: TScene[];
-	currentSceneId: string;
-}): TScene | null {
-	return (
-		scenes.find((s) => s.id === currentSceneId) ||
-		getMainScene({ scenes }) ||
-		scenes[0] ||
-		null
-	);
-}
-
-export function getProjectDurationFromScenes({
-	scenes,
-}: {
-	scenes: TScene[];
-}): MediaTime {
-	const mainScene = getMainScene({ scenes }) ?? scenes[0] ?? null;
-	if (!mainScene?.tracks) {
-		return ZERO_MEDIA_TIME;
-	}
-
-	return calculateTotalDuration({ tracks: mainScene.tracks });
-}
-
-export function updateSceneInArray({
-	scenes,
-	sceneId,
-	updates,
-}: {
-	scenes: TScene[];
-	sceneId: string;
-	updates: Partial<TScene>;
-}): TScene[] {
-	return scenes.map((scene) =>
-		scene.id === sceneId ? { ...scene, ...updates } : scene,
-	);
-}
+import type { TScene } from "@/timeline";
+import { generateUUID } from "@/utils/id";
+import { calculateTotalDuration } from "@/timeline";
+import { MAIN_TRACK_NAME } from "@/timeline/placement/main-track";
+import { type MediaTime, ZERO_MEDIA_TIME } from "@/wasm";
+
+export function getMainScene({ scenes }: { scenes: TScene[] }): TScene | null {
+	return scenes.find((scene) => scene.isMain) || null;
+}
+
+export function ensureMainScene({ scenes }: { scenes: TScene[] }): TScene[] {
+	const hasMain = scenes.some((scene) => scene.isMain);
+	if (!hasMain) {
+		const mainScene = buildDefaultScene({ name: "Main scene", isMain: true });
+		return [mainScene, ...scenes];
+	}
+	return scenes;
+}
+
+export function buildDefaultScene({
+	name,
+	isMain,
+}: {
+	name: string;
+	isMain: boolean;
+}): TScene {
+	return {
+		id: generateUUID(),
+		name,
+		isMain,
+		tracks: {
+			overlay: [],
+			main: {
+				id: generateUUID(),
+				name: MAIN_TRACK_NAME,
+				type: "video",
+				elements: [],
+				muted: false,
+				volume: 0,
+				hidden: false,
+			},
+			audio: [],
+		},
+		bookmarks: [],
+		createdAt: new Date(),
+		updatedAt: new Date(),
+	};
+}
+
+export function canDeleteScene({ scene }: { scene: TScene }): {
+	canDelete: boolean;
+	reason?: string;
+} {
+	if (scene.isMain) {
+		return { canDelete: false, reason: "Cannot delete main scene" };
+	}
+	return { canDelete: true };
+}
+
+export function getFallbackSceneAfterDelete({
+	scenes,
+	deletedSceneId,
+	currentSceneId,
+}: {
+	scenes: TScene[];
+	deletedSceneId: string;
+	currentSceneId: string | null;
+}): TScene | null {
+	if (currentSceneId !== deletedSceneId) {
+		return scenes.find((s) => s.id === currentSceneId) || null;
+	}
+	return getMainScene({ scenes });
+}
+
+export function findCurrentScene({
+	scenes,
+	currentSceneId,
+}: {
+	scenes: TScene[];
+	currentSceneId: string;
+}): TScene | null {
+	return (
+		scenes.find((s) => s.id === currentSceneId) ||
+		getMainScene({ scenes }) ||
+		scenes[0] ||
+		null
+	);
+}
+
+export function getProjectDurationFromScenes({
+	scenes,
+}: {
+	scenes: TScene[];
+}): MediaTime {
+	const mainScene = getMainScene({ scenes }) ?? scenes[0] ?? null;
+	if (!mainScene?.tracks) {
+		return ZERO_MEDIA_TIME;
+	}
+
+	return calculateTotalDuration({ tracks: mainScene.tracks });
+}
+
+export function updateSceneInArray({
+	scenes,
+	sceneId,
+	updates,
+}: {
+	scenes: TScene[];
+	sceneId: string;
+	updates: Partial<TScene>;
+}): TScene[] {
+	return scenes.map((scene) =>
+		scene.id === sceneId ? { ...scene, ...updates } : scene,
+	);
+}
-- 
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