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import {
lastFrameTime as _lastFrameTime,
parseTimecode as _parseTimecode,
roundToFrame as _roundToFrame,
snappedSeekTime as _snappedSeekTime,
TICKS_PER_SECOND as _TICKS_PER_SECOND,
mediaTimeFromSeconds as _mediaTimeFromSeconds,
mediaTimeToSeconds as _mediaTimeToSeconds,
type FrameRate,
type TimeCodeFormat,
} from "opencut-wasm";
/**
* Integer-tick time. Mirrors `MediaTime(i64)` in `rust/crates/time/src/media_time.rs`.
*
* `opencut-wasm` exposes `MediaTime` as a bare `number` alias because tsify
* collapses tuple structs. The brand here is the TS-side discipline that
* recovers the invariant: a `MediaTime` is an integer count of ticks, and the
* only legal way to construct one from a fractional `number` is `roundMediaTime`
* (or `mediaTimeFromSeconds`, which rounds inside the wasm boundary).
*
* Reading is free — `MediaTime` is assignable to `number`. Writing is gated —
* a bare `number` is not assignable to `MediaTime`.
*/
export type MediaTime = number & { readonly __mediaTime: unique symbol };
export const TICKS_PER_SECOND = _TICKS_PER_SECOND();
function isMediaTime(value: number): value is MediaTime {
return Number.isInteger(value);
}
function requireMediaTime({
value,
context,
}: {
value: number;
context: string;
}): MediaTime {
if (!isMediaTime(value)) {
throw new Error(`${context}: expected an integer tick count, got ${value}`);
}
return value;
}
export const ZERO_MEDIA_TIME = requireMediaTime({
value: 0,
context: "ZERO_MEDIA_TIME",
});
/**
* Construct a `MediaTime` from a known-integer tick count. Use `roundMediaTime`
* when the input may be fractional.
*/
export function mediaTime({ ticks }: { ticks: number }): MediaTime {
return requireMediaTime({
value: ticks,
context: "mediaTime()",
});
}
/**
* Project a fractional value onto the integer-tick lattice.
*
* Rounds half away from zero (`-1.5 → -2`, `1.5 → 2`) and normalises `-0` to
* `0`. The away-from-zero rule matches Rust's `.round()` and avoids the
* `Math.round(-0.5) === -0` quirk that propagates `-0` into stored data.
*/
export function roundMediaTime({ time }: { time: number }): MediaTime {
const roundedMagnitude = Math.round(Math.abs(time));
if (roundedMagnitude === 0) {
return ZERO_MEDIA_TIME;
}
return requireMediaTime({
value: time < 0 ? -roundedMagnitude : roundedMagnitude,
context: "roundMediaTime()",
});
}
export function mediaTimeFromSeconds({
seconds,
}: {
seconds: number;
}): MediaTime {
const result = _mediaTimeFromSeconds({ seconds });
if (result === undefined) {
throw new Error(
`mediaTimeFromSeconds: rust returned undefined for seconds=${seconds}`,
);
}
return requireMediaTime({
value: result,
context: "mediaTimeFromSeconds()",
});
}
export function mediaTimeToSeconds({ time }: { time: MediaTime }): number {
return _mediaTimeToSeconds({ time });
}
/**
* Sum `MediaTime` values. Inputs are integer ticks, so the sum is integer too.
*/
export function addMediaTime({
a,
b,
}: {
a: MediaTime;
b: MediaTime;
}): MediaTime {
return requireMediaTime({
value: a + b,
context: "addMediaTime()",
});
}
export function subMediaTime({
a,
b,
}: {
a: MediaTime;
b: MediaTime;
}): MediaTime {
return requireMediaTime({
value: a - b,
context: "subMediaTime()",
});
}
export function maxMediaTime({
a,
b,
}: {
a: MediaTime;
b: MediaTime;
}): MediaTime {
return a > b ? a : b;
}
export function minMediaTime({
a,
b,
}: {
a: MediaTime;
b: MediaTime;
}): MediaTime {
return a < b ? a : b;
}
export function clampMediaTime({
time,
min,
max,
}: {
time: MediaTime;
min: MediaTime;
max: MediaTime;
}): MediaTime {
if (time < min) return min;
if (time > max) return max;
return time;
}
export function roundFrameTime({
time,
fps,
}: {
time: MediaTime;
fps: FrameRate;
}): MediaTime {
return requireMediaTime({
value: _roundToFrame({ time, rate: fps }) ?? time,
context: "roundFrameTime()",
});
}
export function roundFrameTicks({
ticks,
fps,
}: {
ticks: number;
fps: FrameRate;
}): number {
return _roundToFrame({ time: ticks, rate: fps }) ?? ticks;
}
export function snapSeekMediaTime({
time,
duration,
fps,
}: {
time: MediaTime;
duration: MediaTime;
fps: FrameRate;
}): MediaTime {
return requireMediaTime({
value: _snappedSeekTime({ time, duration, rate: fps }) ?? time,
context: "snapSeekMediaTime()",
});
}
export function lastFrameMediaTime({
duration,
fps,
}: {
duration: MediaTime;
fps: FrameRate;
}): MediaTime {
return requireMediaTime({
value: _lastFrameTime({ duration, rate: fps }) ?? duration,
context: "lastFrameMediaTime()",
});
}
export function parseMediaTimecode({
timeCode,
format,
fps,
}: {
timeCode: string;
format: TimeCodeFormat;
fps: FrameRate;
}): MediaTime | null {
const parsedTime = _parseTimecode({ timeCode, format, rate: fps });
if (parsedTime == null) {
return null;
}
return requireMediaTime({
value: parsedTime,
context: "parseMediaTimecode()",
});
}
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