/**
 * Web Audio API integration module
 * Handles AudioContext, buffer processing, and stream management
 */
import { PitchWorklet } from './worklet';
export interface AudioProcessorOptions {
    sampleRate?: number;
    frameSize?: number;
    hopSize?: number;
    useWorklet?: boolean;
    workletPath?: string;
}
/**
 * Manages Web Audio API context and audio processing
 */
export declare class AudioProcessor {
    private context;
    private analyser;
    private source;
    private worklet;
    private readonly options;
    constructor(options?: AudioProcessorOptions);
    /**
     * Initialize AudioContext (must be called after user gesture in browsers)
     */
    initialize(): Promise<void>;
    /**
     * Get the current AudioContext
     */
    getContext(): AudioContext;
    /**
     * Extract audio frames from an AudioBuffer
     */
    extractFrames(buffer: AudioBuffer): Float32Array[];
    /**
     * Resample audio buffer to target sample rate if needed
     */
    resampleBuffer(buffer: AudioBuffer, targetSampleRate: number): Promise<AudioBuffer>;
    /**
     * Create an AnalyserNode for real-time frequency analysis
     */
    createAnalyser(): AnalyserNode;
    /**
     * Connect a MediaStream to the audio processor
     */
    connectStream(stream: MediaStream): Promise<MediaStreamAudioSourceNode>;
    /**
     * Process audio from MediaStream in real-time
     */
    processStream(stream: MediaStream): AsyncGenerator<Float32Array>;
    /**
     * Load audio from URL
     */
    loadFromUrl(url: string): Promise<AudioBuffer>;
    /**
     * Load audio from File
     */
    loadFromFile(file: File): Promise<AudioBuffer>;
    /**
     * Convert mono channel data to AudioBuffer
     */
    createBufferFromChannelData(channelData: Float32Array): AudioBuffer;
    /**
     * Get current sample rate
     */
    getSampleRate(): number;
    /**
     * Get the worklet instance (if enabled)
     */
    getWorklet(): PitchWorklet | null;
    /**
     * Clean up resources
     */
    dispose(): void;
    /**
     * Check if processor is initialized
     */
    isInitialized(): boolean;
}
/**
 * Utility: Mix stereo to mono
 */
export declare function mixToMono(leftChannel: Float32Array, rightChannel: Float32Array): Float32Array;
/**
 * Utility: Calculate RMS (Root Mean Square) of audio signal
 */
export declare function calculateRMS(samples: Float32Array): number;
/**
 * Utility: Normalize audio to [-1, 1] range
 */
export declare function normalizeAudio(samples: Float32Array): Float32Array;
/**
 * Utility: Apply pre-emphasis filter (boosts high frequencies)
 */
export declare function applyPreEmphasis(samples: Float32Array, coefficient?: number): Float32Array;