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-rw-r--r--examples/multimedia/spectrum/app/utils.cpp149
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diff --git a/examples/multimedia/spectrum/app/utils.cpp b/examples/multimedia/spectrum/app/utils.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2017 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the examples of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and The Qt Company. For licensing terms
-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** BSD License Usage
-** Alternatively, 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."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#include <QAudioFormat>
-#include "utils.h"
-
-qint64 audioDuration(const QAudioFormat &format, qint64 bytes)
-{
- return (bytes * 1000000) /
- (format.sampleRate() * format.channelCount() * (format.sampleSize() / 8));
-}
-
-qint64 audioLength(const QAudioFormat &format, qint64 microSeconds)
-{
- qint64 result = (format.sampleRate() * format.channelCount() * (format.sampleSize() / 8))
- * microSeconds / 1000000;
- result -= result % (format.channelCount() * format.sampleSize());
- return result;
-}
-
-qreal nyquistFrequency(const QAudioFormat &format)
-{
- return format.sampleRate() / 2;
-}
-
-QString formatToString(const QAudioFormat &format)
-{
- QString result;
-
- if (QAudioFormat() != format) {
- if (format.codec() == "audio/pcm") {
- Q_ASSERT(format.sampleType() == QAudioFormat::SignedInt);
-
- const QString formatEndian = (format.byteOrder() == QAudioFormat::LittleEndian)
- ? QString("LE") : QString("BE");
-
- QString formatType;
- switch (format.sampleType()) {
- case QAudioFormat::SignedInt:
- formatType = "signed";
- break;
- case QAudioFormat::UnSignedInt:
- formatType = "unsigned";
- break;
- case QAudioFormat::Float:
- formatType = "float";
- break;
- case QAudioFormat::Unknown:
- formatType = "unknown";
- break;
- }
-
- QString formatChannels = QString("%1 channels").arg(format.channelCount());
- switch (format.channelCount()) {
- case 1:
- formatChannels = "mono";
- break;
- case 2:
- formatChannels = "stereo";
- break;
- }
-
- result = QString("%1 Hz %2 bit %3 %4 %5")
- .arg(format.sampleRate())
- .arg(format.sampleSize())
- .arg(formatType)
- .arg(formatEndian)
- .arg(formatChannels);
- } else {
- result = format.codec();
- }
- }
-
- return result;
-}
-
-bool isPCM(const QAudioFormat &format)
-{
- return (format.codec() == "audio/pcm");
-}
-
-
-bool isPCMS16LE(const QAudioFormat &format)
-{
- return isPCM(format) &&
- format.sampleType() == QAudioFormat::SignedInt &&
- format.sampleSize() == 16 &&
- format.byteOrder() == QAudioFormat::LittleEndian;
-}
-
-const qint16 PCMS16MaxValue = 32767;
-const quint16 PCMS16MaxAmplitude = 32768; // because minimum is -32768
-
-qreal pcmToReal(qint16 pcm)
-{
- return qreal(pcm) / PCMS16MaxAmplitude;
-}
-
-qint16 realToPcm(qreal real)
-{
- return real * PCMS16MaxValue;
-}