Store audio from QAudioInput and pass it to SciPy FFT

[Jaime02]

How can I get audio input in real time from QAudioInput, store it in a NumPy array and pass it to SciPy FFT? What I have tried:

from PyQt5.QtMultimedia import QAudioDeviceInfo, QAudioFormat, QAudioInput
import sys

class Window(QMainWindow):
    def __init__(self):
        info = QAudioDeviceInfo()
        input_device = info.defaultInputDevice()
        if input_device.isNull():
            # If no avaiable device is found, we display a error
            print("There is no audio input device available.")
            exit(-1)

        audio_format = QAudioFormat()
        audio_format.setSampleRate(44100)
        audio_format.setSampleSize(8)
        audio_format.setChannelCount(1)
        audio_format.setCodec("audio/pcm")
        audio_format.setSampleType(QAudioFormat.UnSignedInt)

        if sys.byteorder == "little":
            audio_format.setByteOrder(QAudioFormat.LittleEndian)
        else:
            audio_format.setByteOrder(QAudioFormat.BigEndian)
        self.audioInput = QAudioInput(input_device, audio_format, self)
        self.ioDevice = self.audioInput.start()
        self.ioDevice.readyRead.connect(self.read_audio)

    def read_audio(self):
        data: QByteArray = self.ioDevice.readAll()
        print(data.toUInt()) # Prints (0, False) which means error converting data

[JonB]

@Jaime02 said in Store audio from QAudioInput and pass it to SciPy FFT:

print(data.toUInt()) # Prints (0, False) which means error converting data

I know nothing about audio input or format. But you do realize that

• QByteArray::toUInt() only attempts (if it succeeds) to return the first unsigned int in the array?
• You are not supposed to assume that one call to read_audio() and one readAll() read all the data available. It might have read as little as 1 byte. Check data's length?

[Jaime02]

@JonB data length is 1764

[Jaime02]

https://stackoverflow.com/questions/67408378/store-audio-from-qaudioinput-and-pass-it-to-scipy-fft/67409243#67409243

[JonB]

@Jaime02
So it seems to me that the stackoverflow answer say the same as I did:

data.toUInt() converts whole byte array to one uint value - not what you want.

Since you seem to have the answers you seek there, you might like to mark this as solved.