82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
#include "basetonegenerator.h"
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// Qt includes
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#include <QAudioOutput>
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//! private helper to allow QAudioOutput to read from a io device
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class BaseToneGeneratorHelper : public QIODevice
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{
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public:
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BaseToneGeneratorHelper(BaseToneGenerator &generator, QObject *parent = nullptr);
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qint64 readData(char *data, qint64 maxlen) override;
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qint64 writeData(const char *data, qint64 len) override;
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private:
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BaseToneGenerator &m_generator;
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};
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class BaseToneGenerator::BaseToneGeneratorPrivate
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{
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public:
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BaseToneGeneratorPrivate(BaseToneGenerator &generator, const QAudioDeviceInfo &audioDeviceInfo, const QAudioFormat &format);
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~BaseToneGeneratorPrivate() { output.stop(); }
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BaseToneGeneratorHelper helper;
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QAudioOutput output;
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};
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BaseToneGenerator::BaseToneGenerator() = default;
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BaseToneGenerator::~BaseToneGenerator() = default;
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void BaseToneGenerator::start()
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{
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Q_ASSERT(!running());
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QAudioFormat format;
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format.setSampleRate(m_samplerate);
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format.setChannelCount(2);
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format.setSampleSize(sizeof(SamplePair::Type) * 8);
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format.setSampleType(QAudioFormat::SignedInt);
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format.setCodec("audio/pcm");
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format.setByteOrder(QAudioFormat::LittleEndian);
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m_private = std::make_unique<BaseToneGeneratorPrivate>(*this, m_device, format);
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m_private->output.start(&m_private->helper);
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}
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void BaseToneGenerator::stop()
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{
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Q_ASSERT(running());
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m_private = nullptr;
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}
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BaseToneGeneratorHelper::BaseToneGeneratorHelper(BaseToneGenerator &generator, QObject *parent) :
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QIODevice{parent}, m_generator{generator}
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{
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setOpenMode(QIODevice::ReadOnly);
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}
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qint64 BaseToneGeneratorHelper::readData(char *data, qint64 maxlen)
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{
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Q_ASSERT(maxlen % sizeof(SamplePair) == 0);
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return m_generator.fill(reinterpret_cast<SamplePair*>(data),
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reinterpret_cast<SamplePair*>(data) + (maxlen/sizeof(SamplePair))) * sizeof(SamplePair);
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}
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qint64 BaseToneGeneratorHelper::writeData(const char *data, qint64 len)
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{
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Q_UNUSED(data)
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Q_UNUSED(len)
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qFatal("writing is not allowed!");
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}
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BaseToneGenerator::BaseToneGeneratorPrivate::BaseToneGeneratorPrivate(BaseToneGenerator &generator, const QAudioDeviceInfo &audioDeviceInfo, const QAudioFormat &format) :
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helper{generator}, output{audioDeviceInfo, format}
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{
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}
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