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Diffstat (limited to 'examples/charts/audio.py')
| -rw-r--r-- | examples/charts/audio.py | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/examples/charts/audio.py b/examples/charts/audio.py new file mode 100644 index 000000000..94da12cfd --- /dev/null +++ b/examples/charts/audio.py @@ -0,0 +1,128 @@ +#!/usr/bin/python + +############################################################################# +## +## Copyright (C) 2018 The Qt Company Ltd. +## Contact: http://www.qt.io/licensing/ +## +## This file is part of the PySide 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 os +import sys +from PySide2.QtCharts import QtCharts +from PySide2.QtCore import QPointF, QRect, QSize +from PySide2.QtMultimedia import (QAudio, 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_()) |