import { RealtimeConversationItemAssistantMessage, RealtimeConversationItemSystemMessage, RealtimeConversationItemUserMessage } from "openai/resources/realtime/realtime";
/**
 * Convert PCM16 audio data to WAV format.
 */
export declare function pcm16ToWav(pcmData: Buffer, sampleRate?: number, channels?: number): Buffer;
/**
 * Extract message content from a conversation item.
 */
export declare function extractMessageContent(item: RealtimeConversationItemUserMessage): string;
/**
 * Extract output text from a response message.
 */
export declare function extractOutputText(item: RealtimeConversationItemSystemMessage | RealtimeConversationItemUserMessage | RealtimeConversationItemAssistantMessage): string;