audio.py¶
"""PySide6 port of the charts/audio example from Qt v5.x"""
import sys
from PySide6.QtCharts import QChart, QChartView, QLineSeries, QValueAxis
from PySide6.QtCore import QPointF
from PySide6.QtMultimedia import (QAudioDeviceInfo, QAudioFormat,
QAudioInput)
from PySide6.QtWidgets import QApplication, QMainWindow, QMessageBox
sampleCount = 2000
resolution = 4
class MainWindow(QMainWindow):
def __init__(self, device):
super(MainWindow, self).__init__()
self.series = QLineSeries()
self.chart = QChart()
self.chart.addSeries(self.series)
self.axisX = QValueAxis()
self.axisX.setRange(0, sampleCount)
self.axisX.setLabelFormat("%g")
self.axisX.setTitleText("Samples")
self.axisY = QValueAxis()
self.axisY.setRange(-1, 1)
self.axisY.setTitleText("Audio level")
self.chart.setAxisX(self.axisX, self.series)
self.chart.setAxisY(self.axisY, self.series)
self.chart.legend().hide()
self.chart.setTitle("Data from the microphone ({})".format(device.deviceName()))
formatAudio = QAudioFormat()
formatAudio.setSampleRate(8000)
formatAudio.setChannelCount(1)
formatAudio.setSampleSize(8)
formatAudio.setCodec("audio/pcm")
formatAudio.setByteOrder(QAudioFormat.LittleEndian)
formatAudio.setSampleType(QAudioFormat.UnSignedInt)
self.audioInput = QAudioInput(device, formatAudio, self)
self.ioDevice = self.audioInput.start()
self.ioDevice.readyRead.connect(self._readyRead)
self.chartView = QChartView(self.chart)
self.setCentralWidget(self.chartView)
self.buffer = [QPointF(x, 0) for x in range(sampleCount)]
self.series.append(self.buffer)
def closeEvent(self, event):
if self.audioInput is not None:
self.audioInput.stop()
event.accept()
def _readyRead(self):
data = self.ioDevice.readAll()
availableSamples = data.size() // resolution
start = 0
if (availableSamples < sampleCount):
start = sampleCount - availableSamples
for s in range(start):
self.buffer[s].setY(self.buffer[s + availableSamples].y())
dataIndex = 0
for s in range(start, sampleCount):
value = (ord(data[dataIndex]) - 128) / 128
self.buffer[s].setY(value)
dataIndex = dataIndex + resolution
self.series.replace(self.buffer)
if __name__ == '__main__':
app = QApplication(sys.argv)
inputDevice = QAudioDeviceInfo.defaultInputDevice()
if (inputDevice.isNull()):
QMessageBox.warning(None, "audio", "There is no audio input device available.")
sys.exit(-1)
mainWin = MainWindow(inputDevice)
mainWin.setWindowTitle("audio")
availableGeometry = app.desktop().availableGeometry(mainWin)
size = availableGeometry.height() * 3 / 4
mainWin.resize(size, size)
mainWin.show()
sys.exit(app.exec_())
© 2021 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.