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Diffstat (limited to 'examples/multimedia/audiooutput.py')
| -rw-r--r-- | examples/multimedia/audiooutput.py | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/examples/multimedia/audiooutput.py b/examples/multimedia/audiooutput.py deleted file mode 100644 index c6c7b9f93..000000000 --- a/examples/multimedia/audiooutput.py +++ /dev/null @@ -1,300 +0,0 @@ - -############################################################################# -## -## Copyright (C) 2013 Riverbank Computing Limited. -## Copyright (C) 2016 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 multimedia/audiooutput example from Qt v5.x, originating from PyQt""" - -from math import pi, sin -from struct import pack - -from PySide2.QtCore import QByteArray, QIODevice, Qt, QTimer, qWarning -from PySide2.QtMultimedia import (QAudio, QAudioDeviceInfo, QAudioFormat, - QAudioOutput) -from PySide2.QtWidgets import (QApplication, QComboBox, QHBoxLayout, QLabel, - QMainWindow, QPushButton, QSlider, QVBoxLayout, QWidget) - - -class Generator(QIODevice): - - def __init__(self, format, durationUs, sampleRate, parent): - super(Generator, self).__init__(parent) - - self.m_pos = 0 - self.m_buffer = QByteArray() - - self.generateData(format, durationUs, sampleRate) - - def start(self): - self.open(QIODevice.ReadOnly) - - def stop(self): - self.m_pos = 0 - self.close() - - def generateData(self, format, durationUs, sampleRate): - pack_format = '' - - if format.sampleSize() == 8: - if format.sampleType() == QAudioFormat.UnSignedInt: - scaler = lambda x: ((1.0 + x) / 2 * 255) - pack_format = 'B' - elif format.sampleType() == QAudioFormat.SignedInt: - scaler = lambda x: x * 127 - pack_format = 'b' - elif format.sampleSize() == 16: - if format.sampleType() == QAudioFormat.UnSignedInt: - scaler = lambda x: (1.0 + x) / 2 * 65535 - pack_format = '<H' if format.byteOrder() == QAudioFormat.LittleEndian else '>H' - elif format.sampleType() == QAudioFormat.SignedInt: - scaler = lambda x: x * 32767 - pack_format = '<h' if format.byteOrder() == QAudioFormat.LittleEndian else '>h' - - assert(pack_format != '') - - channelBytes = format.sampleSize() // 8 - sampleBytes = format.channelCount() * channelBytes - - length = (format.sampleRate() * format.channelCount() * (format.sampleSize() // 8)) * durationUs // 100000 - - self.m_buffer.clear() - sampleIndex = 0 - factor = 2 * pi * sampleRate / format.sampleRate() - - while length != 0: - x = sin((sampleIndex % format.sampleRate()) * factor) - packed = pack(pack_format, int(scaler(x))) - - for _ in range(format.channelCount()): - self.m_buffer.append(packed) - length -= channelBytes - - sampleIndex += 1 - - def readData(self, maxlen): - data = QByteArray() - total = 0 - - while maxlen > total: - chunk = min(self.m_buffer.size() - self.m_pos, maxlen - total) - data.append(self.m_buffer.mid(self.m_pos, chunk)) - self.m_pos = (self.m_pos + chunk) % self.m_buffer.size() - total += chunk - - return data.data() - - def writeData(self, data): - return 0 - - def bytesAvailable(self): - return self.m_buffer.size() + super(Generator, self).bytesAvailable() - - -class AudioTest(QMainWindow): - - PUSH_MODE_LABEL = "Enable push mode" - PULL_MODE_LABEL = "Enable pull mode" - SUSPEND_LABEL = "Suspend playback" - RESUME_LABEL = "Resume playback" - - DurationSeconds = 1 - ToneSampleRateHz = 600 - DataSampleRateHz = 44100 - - def __init__(self): - super(AudioTest, self).__init__() - - self.m_device = QAudioDeviceInfo.defaultOutputDevice() - self.m_output = None - - self.initializeWindow() - self.initializeAudio() - - def initializeWindow(self): - layout = QVBoxLayout() - - self.m_deviceBox = QComboBox() - self.m_deviceBox.activated[int].connect(self.deviceChanged) - for deviceInfo in QAudioDeviceInfo.availableDevices(QAudio.AudioOutput): - self.m_deviceBox.addItem(deviceInfo.deviceName(), deviceInfo) - - layout.addWidget(self.m_deviceBox) - - self.m_modeButton = QPushButton() - self.m_modeButton.clicked.connect(self.toggleMode) - self.m_modeButton.setText(self.PUSH_MODE_LABEL) - - layout.addWidget(self.m_modeButton) - - self.m_suspendResumeButton = QPushButton( - clicked=self.toggleSuspendResume) - self.m_suspendResumeButton.setText(self.SUSPEND_LABEL) - - layout.addWidget(self.m_suspendResumeButton) - - volumeBox = QHBoxLayout() - volumeLabel = QLabel("Volume:") - self.m_volumeSlider = QSlider(Qt.Horizontal, minimum=0, maximum=100, - singleStep=10) - self.m_volumeSlider.valueChanged.connect(self.volumeChanged) - - volumeBox.addWidget(volumeLabel) - volumeBox.addWidget(self.m_volumeSlider) - - layout.addLayout(volumeBox) - - window = QWidget() - window.setLayout(layout) - - self.setCentralWidget(window) - - def initializeAudio(self): - self.m_pullTimer = QTimer(self) - self.m_pullTimer.timeout.connect(self.pullTimerExpired) - self.m_pullMode = True - - self.m_format = QAudioFormat() - self.m_format.setSampleRate(self.DataSampleRateHz) - self.m_format.setChannelCount(1) - self.m_format.setSampleSize(16) - self.m_format.setCodec('audio/pcm') - self.m_format.setByteOrder(QAudioFormat.LittleEndian) - self.m_format.setSampleType(QAudioFormat.SignedInt) - - info = QAudioDeviceInfo(QAudioDeviceInfo.defaultOutputDevice()) - if not info.isFormatSupported(self.m_format): - qWarning("Default format not supported - trying to use nearest") - self.m_format = info.nearestFormat(self.m_format) - - self.m_generator = Generator(self.m_format, - self.DurationSeconds * 1000000, self.ToneSampleRateHz, self) - - self.createAudioOutput() - - def createAudioOutput(self): - self.m_audioOutput = QAudioOutput(self.m_device, self.m_format) - self.m_audioOutput.notify.connect(self.notified) - self.m_audioOutput.stateChanged.connect(self.handleStateChanged) - - self.m_generator.start() - self.m_audioOutput.start(self.m_generator) - self.m_volumeSlider.setValue(self.m_audioOutput.volume() * 100) - - def deviceChanged(self, index): - self.m_pullTimer.stop() - self.m_generator.stop() - self.m_audioOutput.stop() - self.m_device = self.m_deviceBox.itemData(index) - - self.createAudioOutput() - - def volumeChanged(self, value): - if self.m_audioOutput is not None: - self.m_audioOutput.setVolume(value / 100.0) - - def notified(self): - qWarning("bytesFree = %d, elapsedUSecs = %d, processedUSecs = %d" % ( - self.m_audioOutput.bytesFree(), - self.m_audioOutput.elapsedUSecs(), - self.m_audioOutput.processedUSecs())) - - def pullTimerExpired(self): - if self.m_audioOutput is not None and self.m_audioOutput.state() != QAudio.StoppedState: - chunks = self.m_audioOutput.bytesFree() // self.m_audioOutput.periodSize() - for _ in range(chunks): - data = self.m_generator.read(self.m_audioOutput.periodSize()) - if data is None or len(data) != self.m_audioOutput.periodSize(): - break - - self.m_output.write(data) - - def toggleMode(self): - self.m_pullTimer.stop() - self.m_audioOutput.stop() - - if self.m_pullMode: - self.m_modeButton.setText(self.PULL_MODE_LABEL) - self.m_output = self.m_audioOutput.start() - self.m_pullMode = False - self.m_pullTimer.start(20) - else: - self.m_modeButton.setText(self.PUSH_MODE_LABEL) - self.m_pullMode = True - self.m_audioOutput.start(self.m_generator) - - self.m_suspendResumeButton.setText(self.SUSPEND_LABEL) - - def toggleSuspendResume(self): - if self.m_audioOutput.state() == QAudio.SuspendedState: - qWarning("status: Suspended, resume()") - self.m_audioOutput.resume() - self.m_suspendResumeButton.setText(self.SUSPEND_LABEL) - elif self.m_audioOutput.state() == QAudio.ActiveState: - qWarning("status: Active, suspend()") - self.m_audioOutput.suspend() - self.m_suspendResumeButton.setText(self.RESUME_LABEL) - elif self.m_audioOutput.state() == QAudio.StoppedState: - qWarning("status: Stopped, resume()") - self.m_audioOutput.resume() - self.m_suspendResumeButton.setText(self.SUSPEND_LABEL) - elif self.m_audioOutput.state() == QAudio.IdleState: - qWarning("status: IdleState") - - stateMap = { - QAudio.ActiveState: "ActiveState", - QAudio.SuspendedState: "SuspendedState", - QAudio.StoppedState: "StoppedState", - QAudio.IdleState: "IdleState"} - - def handleStateChanged(self, state): - qWarning("state = " + self.stateMap.get(state, "Unknown")) - - -if __name__ == '__main__': - - import sys - - app = QApplication(sys.argv) - app.setApplicationName("Audio Output Test") - - audio = AudioTest() - audio.show() - - sys.exit(app.exec_()) |