139 lines
4.6 KiB
C++
139 lines
4.6 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QAudioFormat>
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#include "WaveUtils.h"
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qint64 audioDuration(const QAudioFormat &format, qint64 bytes)
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{
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return (bytes * 1000000) /
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(format.sampleRate() * format.channelCount() * (format.sampleSize() / 8));
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}
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qint64 audioLength(const QAudioFormat &format, qint64 microSeconds)
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{
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qint64 result = (format.sampleRate() * format.channelCount() * (format.sampleSize() / 8))
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* microSeconds / 1000000;
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result -= result % (format.channelCount() * format.sampleSize());
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return result;
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}
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qreal nyquistFrequency(const QAudioFormat &format)
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{
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return format.sampleRate() / 2;
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}
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QString formatToString(const QAudioFormat &format)
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{
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QString result;
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if (QAudioFormat() != format) {
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if (format.codec() == "audio/pcm") {
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Q_ASSERT(format.sampleType() == QAudioFormat::SignedInt);
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const QString formatEndian = (format.byteOrder() == QAudioFormat::LittleEndian)
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? QString("LE") : QString("BE");
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QString formatType;
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switch (format.sampleType()) {
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case QAudioFormat::SignedInt:
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formatType = "signed";
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break;
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case QAudioFormat::UnSignedInt:
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formatType = "unsigned";
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break;
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case QAudioFormat::Float:
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formatType = "float";
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break;
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case QAudioFormat::Unknown:
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formatType = "unknown";
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break;
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}
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QString formatChannels = QString("%1 channels").arg(format.channelCount());
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switch (format.channelCount()) {
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case 1:
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formatChannels = "mono";
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break;
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case 2:
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formatChannels = "stereo";
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break;
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}
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result = QString("%1 Hz %2 bit %3 %4 %5")
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.arg(format.sampleRate())
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.arg(format.sampleSize())
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.arg(formatType)
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.arg(formatEndian)
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.arg(formatChannels);
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} else {
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result = format.codec();
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}
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}
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return result;
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}
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bool isPCM(const QAudioFormat &format)
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{
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return (format.codec() == "audio/pcm");
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}
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bool isPCMS16LE(const QAudioFormat &format)
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{
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return isPCM(format) &&
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format.sampleType() == QAudioFormat::SignedInt &&
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format.sampleSize() == 16 &&
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format.byteOrder() == QAudioFormat::LittleEndian;
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}
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const qint16 PCMS16MaxValue = 32767;
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const quint16 PCMS16MaxAmplitude = 32768; // because minimum is -32768
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qreal pcmToReal(qint16 pcm)
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{
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return qreal(pcm) / PCMS16MaxAmplitude;
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}
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qint16 realToPcm(qreal real)
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{
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return real * PCMS16MaxValue;
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}
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