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const MPEG_TS_CLOCK_FREQ_HZ = 90000;
export type RationalTimestamp = {
baseTime: number; // ticks
timescale: number; // ticks per second
};
export function toTimescaleFromBase(
baseTime: number,
destScale: number,
srcBase: number = 1,
round: boolean = false
): number {
const result = baseTime * destScale * srcBase; // equivalent to `(value * scale) / (1 / base)`
return round ? Math.round(result) : result;
}
export function toTimescaleFromScale(
baseTime: number,
destScale: number,
srcScale: number = 1,
round: boolean = false
): number {
return toTimescaleFromBase(baseTime, destScale, 1 / srcScale, round);
}
export function toMsFromMpegTsClock(
baseTime: number,
round: boolean = false
): number {
return toTimescaleFromBase(baseTime, 1000, 1 / MPEG_TS_CLOCK_FREQ_HZ, round);
}
export function toMpegTsClockFromTimescale(
baseTime: number,
srcScale: number = 1
): number {
return toTimescaleFromBase(baseTime, MPEG_TS_CLOCK_FREQ_HZ, 1 / srcScale);
}