1 files changed, 48 insertions, 0 deletions
diff --git a/apps/web/src/lib/retime/resolve.ts b/apps/web/src/lib/retime/resolve.ts
new file mode 100644
index 00000000..cfcfb6a2
--- /dev/null
+++ b/apps/web/src/lib/retime/resolve.ts
@@ -0,0 +1,48 @@
+import type { RetimeConfig } from "@/lib/timeline";
+import { clampRetimeRate } from "@/constants/retime-constants";
+
+function getSafeRate({ rate }: { rate: number }): number {
+	return clampRetimeRate({ rate });
+}
+
+export function getSourceTimeAtClipTime({
+	clipTime,
+	retime,
+}: {
+	clipTime: number;
+	retime?: RetimeConfig;
+}): number {
+	return clipTime * getSafeRate({ rate: retime?.rate ?? 1 });
+}
+
+export function getClipTimeAtSourceTime({
+	sourceTime,
+	retime,
+}: {
+	sourceTime: number;
+	retime?: RetimeConfig;
+}): number {
+	return sourceTime / getSafeRate({ rate: retime?.rate ?? 1 });
+}
+
+export function getEffectiveRateAt({
+	retime,
+}: {
+	clipTime?: number;
+	retime?: RetimeConfig;
+}): number {
+	return getSafeRate({ rate: retime?.rate ?? 1 });
+}
+
+export function getTimelineDurationForSourceSpan({
+	sourceSpan,
+	retime,
+}: {
+	sourceSpan: number;
+	retime?: RetimeConfig;
+}): number {
+	if (sourceSpan <= 0) {
+		return 0;
+	}
+	return sourceSpan / getSafeRate({ rate: retime?.rate ?? 1 });
+}