aixblock-voice-ai-deepgram/dist/utils/audio/AudioUtils.d.ts

A React component for real-time transcription and voice agent interactions using Deepgram APIs

/**
 * Audio processing utilities for smooth real-time audio playback
 */
/**
 * Creates an AudioBuffer from raw Linear16 PCM data
 * @param audioContext The Web Audio API AudioContext
 * @param data ArrayBuffer containing Linear16 PCM audio data
 * @param sampleRate Sample rate of the audio data (default: 24000Hz)
 * @returns AudioBuffer ready for playback
 */
export declare function createAudioBuffer(audioContext: AudioContext, data: ArrayBuffer, sampleRate?: number): AudioBuffer | undefined;
/**
 * Plays an AudioBuffer with precise timing to ensure continuous playback
 * @param audioContext The Web Audio API AudioContext
 * @param buffer AudioBuffer to play
 * @param startTimeRef Reference to the start time (to maintain continuity between chunks)
 * @param analyzer Optional AudioAnalyser node for volume analysis
 * @returns AudioBufferSourceNode that's playing the buffer
 */
export declare function playAudioBuffer(audioContext: AudioContext, buffer: AudioBuffer, startTimeRef: {
    current: number;
}, analyzer?: AnalyserNode): AudioBufferSourceNode;
/**
 * Downsamples audio data from one sample rate to another
 * @param buffer Float32Array of audio samples
 * @param fromSampleRate Original sample rate
 * @param toSampleRate Target sample rate
 * @returns Downsampled Float32Array
 */
export declare function downsample(buffer: Float32Array, fromSampleRate: number, toSampleRate: number): Float32Array;
/**
 * Converts Float32Array audio data to Int16Array format
 * @param buffer Float32Array of audio samples
 * @returns ArrayBuffer containing Int16 audio data
 */
export declare function convertFloat32ToInt16(buffer: Float32Array): ArrayBuffer;
/**
 * Normalizes audio volume using frequency data from an analyzer
 * @param analyzer AudioAnalyser node
 * @param dataArray Uint8Array to store analyzer data
 * @param normalizationFactor Factor to normalize against (higher = quieter)
 * @returns Normalized volume level between 0-1
 */
export declare function normalizeVolume(analyzer: AnalyserNode, dataArray: Uint8Array, normalizationFactor: number): number;