MediaClock.php

<?php

declare(strict_types=1);

/**
 * This file is part of MadelineProto.
 * MadelineProto is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
 * MadelineProto is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Affero General Public License for more details.
 * You should have received a copy of the GNU General Public License along with MadelineProto.
 * If not, see <http://www.gnu.org/licenses/>.
 *
 * @author    Daniil Gentili <daniil@daniil.it>
 * @copyright 2016-2025 Daniil Gentili <daniil@daniil.it>
 * @license   https://opensource.org/licenses/AGPL-3.0 AGPLv3
 * @link https://docs.madelineproto.xyz MadelineProto documentation
 */

namespace danog\MadelineProto;

/**
 * Conversions for the monotonic clock (hrtime(true), in nanoseconds).
 *
 * @internal
 */
final class MediaClock
{
    /**
     * Nanoseconds in $ticks of a clock of $clockRate Hz, rounded down. Without overflowing for any duration a file can
     * have: ticks × 10^9 does after ~28 hours at 90 kHz.
     */
    public static function ticksToNs(int $ticks, int $clockRate): int
    {
        return intdiv($ticks, $clockRate) * 1_000_000_000 + intdiv($ticks % $clockRate * 1_000_000_000, $clockRate);
    }
}