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Diffstat (limited to 'examples/multimedia/spectrum/app/tonegenerator.cpp')
-rw-r--r-- | examples/multimedia/spectrum/app/tonegenerator.cpp | 100 |
1 files changed, 0 insertions, 100 deletions
diff --git a/examples/multimedia/spectrum/app/tonegenerator.cpp b/examples/multimedia/spectrum/app/tonegenerator.cpp deleted file mode 100644 index 2e549ab4f..000000000 --- a/examples/multimedia/spectrum/app/tonegenerator.cpp +++ /dev/null @@ -1,100 +0,0 @@ -/**************************************************************************** -** -** 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 "spectrum.h" -#include "utils.h" -#include <QByteArray> -#include <QAudioFormat> -#include <qmath.h> -#include <qendian.h> - -void generateTone(const SweptTone &tone, const QAudioFormat &format, QByteArray &buffer) -{ - Q_ASSERT(isPCMS16LE(format)); - - const int channelBytes = format.sampleSize() / 8; - const int sampleBytes = format.channelCount() * channelBytes; - int length = buffer.size(); - const int numSamples = buffer.size() / sampleBytes; - - Q_ASSERT(length % sampleBytes == 0); - Q_UNUSED(sampleBytes); // suppress warning in release builds - - unsigned char *ptr = reinterpret_cast<unsigned char *>(buffer.data()); - - qreal phase = 0.0; - - const qreal d = 2 * M_PI / format.sampleRate(); - - // We can't generate a zero-frequency sine wave - const qreal startFreq = tone.startFreq ? tone.startFreq : 1.0; - - // Amount by which phase increases on each sample - qreal phaseStep = d * startFreq; - - // Amount by which phaseStep increases on each sample - // If this is non-zero, the output is a frequency-swept tone - const qreal phaseStepStep = d * (tone.endFreq - startFreq) / numSamples; - - while (length) { - const qreal x = tone.amplitude * qSin(phase); - const qint16 value = realToPcm(x); - for (int i=0; i<format.channelCount(); ++i) { - qToLittleEndian<qint16>(value, ptr); - ptr += channelBytes; - length -= channelBytes; - } - - phase += phaseStep; - while (phase > 2 * M_PI) - phase -= 2 * M_PI; - phaseStep += phaseStepStep; - } -} |