import { AudioEngine, MIDINoteNumber, Velocity } from '../types';
/**
 * High-quality sample-based audio engine for piano sounds
 * Uses Web Audio API with pre-loaded samples
 */
export declare class PianoAudioEngine implements AudioEngine {
    private audioContext;
    private masterGain;
    private samples;
    private activeNotes;
    private initialized;
    init(): Promise<void>;
    /**
     * Load a set of piano samples from URLs
     * @param sampleMap Map of MIDI note numbers to audio file URLs
     */
    loadSamples(sampleMap: Map<number, string>): Promise<void>;
    playNote(pitch: MIDINoteNumber, velocity: Velocity, duration: number): void;
    stopNote(pitch: MIDINoteNumber): void;
    stopAll(): void;
    setVolume(volume: number): void;
    dispose(): void;
    /**
     * Find the closest loaded sample to the target pitch
     */
    private findClosestSample;
    /**
     * Calculate playback rate for pitch shifting
     */
    private calculatePlaybackRate;
    /**
     * Fallback oscillator-based note playback
     */
    private playOscillatorNote;
    /**
     * Convert MIDI note number to frequency in Hz
     */
    private midiToFrequency;
}
//# sourceMappingURL=AudioEngine.d.ts.map