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#############################################################################
##
## Copyright (C) 2018 The Qt Company Ltd.
## Contact: http://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of The Qt Company Ltd nor the names of its
## contributors may be used to endorse or promote products derived
## from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################
"""PySide2 port of the charts/audio example from Qt v5.x"""
import sys
from PySide2.QtCharts import QtCharts
from PySide2.QtCore import QPointF
from PySide2.QtMultimedia import (QAudioDeviceInfo, QAudioFormat,
QAudioInput)
from PySide2.QtWidgets import QApplication, QMainWindow, QMessageBox
sampleCount = 2000
resolution = 4
class MainWindow(QMainWindow):
def __init__(self, device):
super(MainWindow, self).__init__()
self.series = QtCharts.QLineSeries()
self.chart = QtCharts.QChart()
self.chart.addSeries(self.series)
self.axisX = QtCharts.QValueAxis()
self.axisX.setRange(0, sampleCount)
self.axisX.setLabelFormat("%g")
self.axisX.setTitleText("Samples")
self.axisY = QtCharts.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 = QtCharts.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_())
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