feat: add transitions, track mixing, and voiceover controls

2 files changed, 39 insertions, 0 deletions

diff --git a/apps/web/src/commands/timeline/track/index.ts b/apps/web/src/commands/timeline/track/index.ts
index 9d4bd9c3..4aa4ceaf 100644
--- a/apps/web/src/commands/timeline/track/index.ts
+++ b/apps/web/src/commands/timeline/track/index.ts
@@ -2,3 +2,4 @@ export { AddTrackCommand } from "./add-track";
 export { RemoveTrackCommand } from "./remove-track";
 export { ToggleTrackMuteCommand } from "./toggle-track-mute";
 export { ToggleTrackVisibilityCommand } from "./toggle-track-visibility";
+export { UpdateTrackVolumeCommand } from "./update-track-volume";
diff --git a/apps/web/src/commands/timeline/track/update-track-volume.ts b/apps/web/src/commands/timeline/track/update-track-volume.ts
new file mode 100644
index 00000000..ecd7f6ac
--- /dev/null
+++ b/apps/web/src/commands/timeline/track/update-track-volume.ts
@@ -0,0 +1,38 @@
+import { Command, type CommandResult } from "@/commands/base-command";
+import { EditorCore } from "@/core";
+import type { SceneTracks } from "@/timeline";
+import { canTrackHaveAudio, updateTrackInSceneTracks } from "@/timeline";
+import { clampDb } from "@/timeline/audio-state";
+
+export class UpdateTrackVolumeCommand extends Command {
+	private savedState: SceneTracks | null = null;
+
+	constructor({ trackId, volume }: { trackId: string; volume: number }) {
+		super();
+		this.trackId = trackId;
+		this.volume = clampDb(volume);
+	}
+
+	private trackId: string;
+	private volume: number;
+
+	execute(): CommandResult | undefined {
+		const editor = EditorCore.getInstance();
+		this.savedState = editor.scenes.getActiveScene().tracks;
+		const updatedTracks = updateTrackInSceneTracks({
+			tracks: this.savedState,
+			trackId: this.trackId,
+			update: (track) =>
+				canTrackHaveAudio(track) ? { ...track, volume: this.volume } : track,
+		});
+		editor.timeline.updateTracks(updatedTracks);
+		return undefined;
+	}
+
+	undo(): void {
+		if (this.savedState) {
+			const editor = EditorCore.getInstance();
+			editor.timeline.updateTracks(this.savedState);
+		}
+	}
+}