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goodatlas / react-native-audio-record

Audio record buffers for React Native (iOS and Android)
MIT License
176 stars 101 forks source link

How could I use chunks data to stream to server? #44

Closed sonnd08 closed 3 years ago

sonnd08 commented 3 years ago

I have played around and stuck with streaming base64 chunk to server. I want to use this for google speech to text. Is there any document to archive this? Thanks for your help!

const audioPieces = [];
AudioRecord.on('data', data => {
   // base64-encoded audio data chunks
   audioPieces.push(Buffer.from(data, 'base64'));
});

function stopRecording() {
  console.log('stopRecording -> onStop', onStop);
  clearTimeout(recorderTimer);

  const audioFile = await AudioRecord.stop();
  const base64Data = Buffer.concat(audioPieces).toString('base64');
  sendBase64ToServer(base64Data)

  console.log('audioFile', audioFile);
}

Here is server code

const base64Data = base64DataFromClient
const defaultSTTConfig = {
  encoding: 'LINEAR16',
  sampleRateHertz: 16000,
  languageCode: 'en-US',
};
 const client = new speech.SpeechClient();

  const config = {
    ...defaultSTTConfig,
  };

  const request = {
    config,
    interimResults: false, // If you want interim results, set this to true
  };

  // Create a recognize stream
  const recognizeStream = client
    .streamingRecognize(request)
    .on('error', console.error)
    .on('data', (data) => {
      console.log('getTranscriptionFromFakeStream -> data', data);
      process.stdout.write(
        data.results[0] && data.results[0].alternatives[0]
          ? `Transcription: ${data.results[0].alternatives[0].transcript}\n`
          : '\n\nReached transcription time limit, press Ctrl+C\n',
      );
    });
  const buffer = Buffer.from(base64Data, 'base64');
  const readableStream = Readable.from([buffer]);

  readableStream.pipe(recognizeStream);
sonnd08 commented 3 years ago

I already resolve this, basically, data return from on('data', (data) =>{} is base 64 encoded for pcm format. It's almost the same as wav but missing the wav header, so I just figure a way to stream the header first (first 44 bytes of result file), then others chunk come in later.

soesujith commented 3 years ago

Hi, I have been spending quite a long time to figure this out where in I am streaming the chunks to a transcription service. Similar example using usermedia in browser works though. Does it require each chunk to have the wave header when send to STT Api? Or just the first time? If possible can you share a sample code how to send the wave header and rest of the chunks from AudioRecord?

Thanks in advance.

sonnd08 commented 3 years ago

@sbsujith You only need to stream the header in the first time, it looks like you are trying to stream one long wav file. I use socket io to emit chunks to server. I think you will figure out how to get first 44 bytes of wav result file (I do it by using file stream of node js and write first 44 bytes to an array in a text file, don't remember exactly) So, frontend will use a function like this to emit chunks

import {Buffer} from 'buffer';
import wavHeaderBytes from 'wavHeaderBytes.js' // <= this just an bytes array

function streamAudioChunk({ base64Chunk }) {
  socket && socket.emit(EVENTS.AUDIO_STREAM_CHUNK, { base64Chunk });
}
    streamAudioChunk({
       base64Chunk: Buffer.from(wavHeaderBytes).toString("base64"),
    });

    AudioRecord.start();
    AudioRecord.on('data', data => {
      // base64-encoded audio data chunks
      streamAudioChunk({base64Chunk: data});
    });

and in nodejs socket server

const recognizeStream = createRecognizeStream();
      const readable = new Readable();
      readable._read = () => {}; // _read is required but you can noop it
      readable.pipe(recognizeStream);

      //  you could use this to write data to a file, if you transmit correct, you'll able to open it
      // const outputStream = fs.createWriteStream('testAudio.wav'); 
      // readable.pipe(outputStream); 

      socketInstance.on(SOCKET_EVENTS.AUDIO_STREAM_CHUNK, ({ base64Chunk }) => {
        readable.push(Buffer.from(base64Chunk, 'base64'));
      });
      socketInstance.on(SOCKET_EVENTS.END_AUDIO_STREAM, () => {
        readable.push(null);
      });
sonnd08 commented 3 years ago

here is my wavHeaderBytes.js for below config if you need

    AudioRecord.init({
      sampleRate: 16000, // default 44100
      channels: 1, // 1 or 2, default 1
      bitsPerSample: 16, // 8 or 16, default 16
      audioSource: 6, // android only
      wavFile: 'audio.wav', // default 'audio.wav'
    });
const wavHeaderBytes = 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export default wavHeaderBytes
soesujith commented 3 years ago

Thats fantastic. Thank you for your help. I will try it out. Are saying that if I change the sample rate ( say, to 44100) the header bytes would also should change?

sonnd08 commented 3 years ago

Yes, it will change

On Wed, Dec 9, 2020, 00:30 Sujith Kumar notifications@github.com wrote:

Thats fantastic. Thank you for your help. I will try it out. Are saying that if I change the sample rate ( say, to 44100) the header bytes would also should change?

— You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub https://github.com/goodatlas/react-native-audio-record/issues/44#issuecomment-740783863, or unsubscribe https://github.com/notifications/unsubscribe-auth/AFMI7Z4MC6GTHAC6S2SHJMLSTZPEXANCNFSM4TZXDR3Q .

soesujith commented 3 years ago

Thanks again. Can you let me know what should be the wav header bytes for same config except sampleRate = 44100, or direct me to where I can get that info.

sonnd08 commented 3 years ago

Thanks again. Can you let me know what should be the wav header bytes for same config except sampleRate = 44100, or direct me to where I can get that info.

If you using for STT, my config is enough and lightweight as well. I'm not sure if the header should be match the config or not (I believe yes)

I get this script from my old git stash, I think I used this to extract wav bytes. You could get the audio which match your setting with this script and then extract header from it

let audioFilePath = await AudioRecord.stop();
const defaultFilePath = path.join(__dirname, '../public/audios/audio3.wav');

export default function extractFileBytes({ filePath = defaultFilePath } = {}) {
  return;
  const readStream = fs.createReadStream(filePath);
  const writeStream = fs.createWriteStream('./output.txt');
  const buffer = [];
  readStream.on('data', function (chunk) {
    buffer.push(chunk);
    // writeStream.write([...chunk].join(','));
  });
  readStream.on('end', () => {
    writeStream.write(Buffer.concat(buffer).toString('base64'));
    writeStream.end();
  });
}

about

writeStream.write(Buffer.concat(buffer).toString('base64'));

I think it should be writeStream.write(Buffer.concat(buffer)) or any way you could do to get bytes from buffer

soesujith commented 3 years ago

Thanks again. Can you let me know what should be the wav header bytes for same config except sampleRate = 44100, or direct me to where I can get that info.

If you using for STT, my config is enough and lightweight as well. I'm not sure if the header should be match the config or not (I believe yes)

I get this script from my old git stash, I think I used this to extract wav bytes. You could get the audio which match your setting with this script and then extract header from it

let audioFilePath = await AudioRecord.stop();
const defaultFilePath = path.join(__dirname, '../public/audios/audio3.wav');

export default function extractFileBytes({ filePath = defaultFilePath } = {}) {
  return;
  const readStream = fs.createReadStream(filePath);
  const writeStream = fs.createWriteStream('./output.txt');
  const buffer = [];
  readStream.on('data', function (chunk) {
    buffer.push(chunk);
    // writeStream.write([...chunk].join(','));
  });
  readStream.on('end', () => {
    writeStream.write(Buffer.concat(buffer).toString('base64'));
    writeStream.end();
  });
}

about

writeStream.write(Buffer.concat(buffer).toString('base64'));

I think it should be writeStream.write(Buffer.concat(buffer)) or any way you could do to get bytes from buffer

Thank you for your help, mate.