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enable send and receive streams as strings #2

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Merged
ArielMannes merged 1 commit into from
Jun 25, 2025
Merged

enable send and receive streams as strings #2

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18 changes: 12 additions & 6 deletions src/websocket/bot-conversation.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,10 @@ import {
BotActivity,
BotActivityType,
BotToVaicMessageName,
MediaFormat,
PlayAudioOptions,
ProtocolMessage,
StreamMode,
VaicToBotMessageName
} from './types.js';
import { EventEmitter } from 'events';
Expand All @@ -27,12 +29,12 @@ function redactMessage(message: ProtocolMessage) {
export class BotConversationWebSocket extends EventEmitter {
private ended = false;
private conversationId = '';
private mediaFormat = 'raw/lpcm16';
private mediaFormat = MediaFormat.RAW_LINEAR_16;
private recordingSeq = 0;
private sendBackIncomingVoice?: NodeJS.Timeout;
private userAudio?: PassThrough;

constructor(private websocket: WebSocket) {
constructor(private websocket: WebSocket, private streamMode: StreamMode = StreamMode.BINARY) {
super();
// eslint-disable-next-line @typescript-eslint/no-misused-promises
websocket.on('message', async (message) => {
Expand Down Expand Up @@ -60,17 +62,17 @@ export class BotConversationWebSocket extends EventEmitter {
log(`[${this.conversationId}]`, ...args);
}

playAudio(stream: Readable, options?: PlayAudioOptions) {
playAudio(stream: Readable, options?: PlayAudioOptions, streamMode: StreamMode = this.streamMode) {
const currentId = `play-${this.recordingSeq++}`;
let streamEnded = false;
this.send(BotToVaicMessageName.playStreamStart, { mediaFormat: this.mediaFormat, streamId: currentId, ...options })
.then(() => {
stream.on('data', (chunk: Buffer) => {
stream.on('data', (chunk: Buffer | string) => {
if (streamEnded || this.ended) {
return;
}
this.send(BotToVaicMessageName.playStreamChunk, {
audioChunk: chunk.toString('base64'),
audioChunk: streamMode === StreamMode.BASE64 ? chunk : chunk.toString('base64'),
streamId: currentId
}).catch(() => {
streamEnded = true;
Expand Down Expand Up @@ -125,7 +127,11 @@ export class BotConversationWebSocket extends EventEmitter {
await this.send(BotToVaicMessageName.userStreamStarted);
break;
case VaicToBotMessageName.userStreamChunk:
this.userAudio?.write(Buffer.from(msgJson.audioChunk!, 'base64'));
if (this.streamMode === StreamMode.BINARY) {
this.userAudio?.write(Buffer.from(msgJson.audioChunk!, 'base64'));
break;
}
this.userAudio?.write(msgJson.audioChunk!);
break;
case VaicToBotMessageName.userStreamStop:
this.#log('user stream stopped');
Expand Down
13 changes: 11 additions & 2 deletions src/websocket/types.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
import Stream from 'stream';

export enum BotActivityType {
message = 'message',
Expand Down Expand Up @@ -82,10 +81,20 @@ export enum BotToVaicMessageName {
playStreamStop = 'playStream.stop'
}

export enum MediaFormat {
RAW_LINEAR_16 = 'raw/lpcm16',
RAW_LINEAR_16_24 = 'raw/lpcm16_24'
};

export enum StreamMode {
BINARY = 'binary',
BASE64 = 'base64',
};

export interface PlayAudioOptions {
altText?: string;
activityParams?: Record<string, unknown>;
mediaFormat?: string;
mediaFormat?: MediaFormat;
};

export interface ProtocolMessage extends PlayAudioOptions {
Expand Down