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Chunks have to be sent with at least one per 5 seconds frequency. Как решать? #155

Description

@PavelNen

Как с помощью stt в SDK делать расшифровку аудио любой длины?

Ошибка
Chunks have to be sent with at least one per 5 seconds frequency

Задача
Делаю сервис, который берёт аудиофайл WAV формата и расшифровывает с помощью Яндекс Облака.
В целом, бизнес-задача: взять аудиофайл с бакета, расшифровать и сохранить текст в базе. То есть реалтайм не нужен.

Вопрос
Какие есть быстрые способы решения этой проблемы в рамках сервиса SpeechKit и SDK?

import { Injectable } from '@nestjs/common';
import { serviceClients, Session } from '@yandex-cloud/nodejs-sdk';
import {
  RecognitionSpec_AudioEncoding,
  StreamingRecognitionRequest,
} from '@yandex-cloud/nodejs-sdk/dist/generated/yandex/cloud/ai/stt/v2/stt_service';
import * as wav from 'wav';
import { PassThrough, Readable } from 'stream';
import { getEnv } from '../utils/get-env';
import { log } from '../utils/logger';

@Injectable()
export class SpeechService {
  async streamToText(
    audioStream: Readable,
    responseStream: PassThrough,
  ): Promise<void> {
    const reader = new wav.Reader({});
    const writer = new wav.Writer({
      sampleRate: 16000,
      channels: 1,
      bitDepth: 16,
    });
    const data = new PassThrough();
    const authToken = getEnv('YC_OAUTH_TOKEN');
    const folderId = getEnv('YC_FOLDER_ID');
    const session = new Session({ oauthToken: authToken });
    const client = session.client(serviceClients.SttServiceClient);

    const formatPromise = new Promise<wav.Format>((resolve) => {
      reader.on('format', (format: wav.Format) => {
        resolve(format);
      });
    });

    audioStream.pipe(writer).pipe(data);

    async function* createRequest(): AsyncIterable<StreamingRecognitionRequest> {
      const format = await formatPromise;

      yield StreamingRecognitionRequest.fromPartial({
        config: {
          specification: {
            audioEncoding: RecognitionSpec_AudioEncoding.LINEAR16_PCM,
            sampleRateHertz: format.sampleRate,
            audioChannelCount: format.channels,
          },
          folderId,
        },
      });
      for await (const chunk of writer) {
        yield StreamingRecognitionRequest.fromPartial({
          audioContent: chunk,
        });
      }
    }

    try {
      for await (const response of client.streamingRecognize(createRequest())) {
        const text = JSON.stringify(response, null, 2);
        responseStream.write(text);
      }
      responseStream.end();
    } catch (error) {
      log(error);
      responseStream.destroy(error);
    }
  }
}

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