53fdcca366
Delete obsolete methods from QAudioFormat and QAudioDeviceInfo and update code that relied on the obsolete methods. Change-Id: I007e36375a45399b1d5a289341bc5d5a05dc68cc Reviewed-by: Michael Goddard <michael.goddard@nokia.com>
92 lines
3.5 KiB
C++
92 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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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 Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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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 "spectrum.h"
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#include "utils.h"
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#include <QByteArray>
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#include <QtMultimedia/QAudioFormat>
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#include <QtCore/qmath.h>
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#include <QtCore/qendian.h>
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void generateTone(const SweptTone &tone, const QAudioFormat &format, QByteArray &buffer)
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{
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Q_ASSERT(isPCMS16LE(format));
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const int channelBytes = format.sampleSize() / 8;
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const int sampleBytes = format.channelCount() * channelBytes;
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int length = buffer.size();
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const int numSamples = buffer.size() / sampleBytes;
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Q_ASSERT(length % sampleBytes == 0);
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Q_UNUSED(sampleBytes) // suppress warning in release builds
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unsigned char *ptr = reinterpret_cast<unsigned char *>(buffer.data());
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qreal phase = 0.0;
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const qreal d = 2 * M_PI / format.sampleRate();
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// We can't generate a zero-frequency sine wave
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const qreal startFreq = tone.startFreq ? tone.startFreq : 1.0;
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// Amount by which phase increases on each sample
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qreal phaseStep = d * startFreq;
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// Amount by which phaseStep increases on each sample
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// If this is non-zero, the output is a frequency-swept tone
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const qreal phaseStepStep = d * (tone.endFreq - startFreq) / numSamples;
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while (length) {
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const qreal x = tone.amplitude * qSin(phase);
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const qint16 value = realToPcm(x);
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for (int i=0; i<format.channelCount(); ++i) {
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qToLittleEndian<qint16>(value, ptr);
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ptr += channelBytes;
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length -= channelBytes;
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}
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phase += phaseStep;
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while (phase > 2 * M_PI)
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phase -= 2 * M_PI;
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phaseStep += phaseStepStep;
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}
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}
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