import AbstractFifoSamplePipe from './AbstractFifoSamplePipe.js';
/**
 * Sample rate transposer for pitch and tempo manipulation.
 * Used internally by SoundTouch for rate-based processing.
 */
export default class RateTransposer extends AbstractFifoSamplePipe {
    /**
     * Current rate factor for transposition.
     */
    private _rate;
    /**
     * Internal slope accumulator for interpolation.
     */
    private slopeCount;
    /**
     * Previous left channel sample for interpolation.
     */
    private prevSampleL;
    /**
     * Previous right channel sample for interpolation.
     */
    private prevSampleR;
    /**
     * Creates a RateTransposer instance.
     * @param createBuffers Whether to allocate internal buffers.
     */
    constructor(createBuffers?: boolean);
    /**
     * Sets the rate factor for transposition.
     * @param rate Rate factor.
     */
    set rate(rate: number);
    /**
     * Resets internal state for interpolation.
     */
    private reset;
    /**
     * Clears buffers and resets internal state.
     */
    clear(): void;
    /**
     * Creates a clone of this RateTransposer with the same rate.
     * @returns Cloned RateTransposer instance.
     */
    clone(): RateTransposer;
    /**
     * Processes input buffer and writes transposed samples to output buffer.
     */
    process(): void;
    /**
     * Transposes input samples by the current rate.
     * @param numFrames Number of input frames to transpose.
     * @returns Number of output frames written.
     */
    transpose(numFrames?: number): number;
}
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