import { PaperSpeed, RollCopy } from "../model/RollCopy.js";
import { TrackerBar } from "../systems/TrackerBar.js";
/**
 * Rows of the image on an inch of paper. The player reads eight rows a
 * second per unit of roll tempo (tempo 80 comes with a sample rate of
 * 640 Hz), and the tempo counts tenths of a foot per minute, which puts
 * 400 rows on an inch. This is the file's own calibration; whether the
 * scanner kept it is for an alignment with other copies to tell.
 * @category Sources
 */
export declare const SPENCER_ROWS_PER_INCH = 400;
/**
 * How `readFromSpencerBar` reads a file: the rows of its image on an
 * inch of paper, and the bar it numbers its positions by.
 * @category Sources
 */
export interface SpencerBarOptions {
    /** Rows of the image on an inch of paper. */
    rowsPerInch?: number;
    /**
     * The bar the file numbers its positions by, which is the bar of
     * the roll it was scanned from. His Welte files are Licensee rolls.
     */
    system?: TrackerBar;
}
/**
 * Reads the copy on the bar it was cut for, whose numbering it keeps.
 * A chain on a position that bar does not read is left out, as the bar
 * would leave it.
 * @category Sources
 */
export declare function readFromSpencerBar(buffer: ArrayBuffer, { rowsPerInch, system }?: SpencerBarOptions): RollCopy;
/**
 * The `.ann` file beside a `.bar` holds the player's settings for the
 * roll as lines of "/key:   value": title, composer, pianist, roll
 * number and class, and the tempo the roll is played at.
 * @category Sources
 */
export declare const readSpencerAnn: (text: string) => ReadonlyMap<string, string>;
/**
 * The paper speed a `.ann` states through its roll tempo, where it states one.
 * @category Sources
 */
export declare const paperSpeedOfSpencerAnn: (ann: ReadonlyMap<string, string>) => PaperSpeed | undefined;