import { type EncodedSpeechFormat } from './lib/audio-transcode.js';
export type SpeechResponseFormat = 'wav' | 'pcm';
export interface SpeechFormatNative {
    kind: 'native';
    format: SpeechResponseFormat;
    contentType: string;
}
export interface SpeechFormatTranscoded {
    kind: 'transcoded';
    format: EncodedSpeechFormat;
    contentType: string;
}
export interface SpeechFormatInvalid {
    kind: 'invalid';
    format: string;
    message: string;
}
export type MappedSpeechFormat = SpeechFormatNative | SpeechFormatTranscoded | SpeechFormatInvalid;
export declare const DEFAULT_SPEECH_FORMAT: SpeechResponseFormat;
export declare function mapResponseFormat(input: unknown): MappedSpeechFormat;
export declare function pcmContentType(sampleRate: number): string;
export declare const DEFAULT_SAMPLE_RATE = 24000;
export declare function resolveSampleRate(config: Record<string, unknown> | undefined): number;
export declare function int16SamplesToBuffer(samples: number[]): Buffer;
export declare function buildWavHeader(dataLength: number, sampleRate: number): Buffer;
export declare function buildWavBuffer(samples: number[], sampleRate: number): Buffer;
export declare function speechAliasKey(model: string, voice: string): string;
//# sourceMappingURL=audio.d.ts.map