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#include "beattracker.hpp"
#include <QAudioSource>
#include <QDebug>
#include <QIODevice>
#include <QMediaDevices>
#include <QObject>
#include <aubio/aubio.h>
BeatTracker::BeatTracker(uint_t sampleRate, uint_t hopSize, QObject* parent)
: QObject(parent)
, m_tempo(new_aubio_tempo("default", 1024, hopSize, sampleRate))
, m_in(new_fvec(hopSize))
, m_out(new_fvec(2))
, m_hopSize(hopSize)
, m_bpm(120)
, m_refCount(0) {
QAudioFormat format;
format.setSampleRate(static_cast<int>(sampleRate));
format.setChannelCount(1);
format.setSampleFormat(QAudioFormat::Int16);
m_source = new QAudioSource(QMediaDevices::defaultAudioInput(), format, this);
connect(m_source, &QAudioSource::stateChanged, this, &BeatTracker::handleStateChanged);
};
BeatTracker::~BeatTracker() {
del_aubio_tempo(m_tempo);
del_fvec(m_in);
del_fvec(m_out);
m_source->stop();
delete m_source;
}
smpl_t BeatTracker::bpm() const {
return m_bpm;
}
int BeatTracker::refCount() const {
return m_refCount;
}
void BeatTracker::setRefCount(int refCount) {
if (m_refCount == refCount) {
return;
}
m_refCount = refCount;
emit refCountChanged();
if (m_refCount == 0) {
stop();
} else if (!m_device) {
start();
}
}
void BeatTracker::start() {
m_device = m_source->start();
connect(m_device, &QIODevice::readyRead, this, &BeatTracker::process);
}
void BeatTracker::stop() {
m_source->stop();
m_device = nullptr;
}
void BeatTracker::process() {
const QByteArray data = m_device->readAll();
const int16_t* samples = reinterpret_cast<const int16_t*>(data.constData());
const size_t count = static_cast<size_t>(data.size()) / sizeof(int16_t);
for (size_t i = 0; i < count; ++i) {
m_in->data[i % m_hopSize] = samples[i] / 32768.0f;
if ((i + 1) % m_hopSize == 0) {
aubio_tempo_do(m_tempo, m_in, m_out);
if (m_out->data[0] != 0.0f) {
m_bpm = aubio_tempo_get_bpm(m_tempo);
emit bpmChanged();
emit beat(m_bpm);
}
}
}
}
void BeatTracker::handleStateChanged(QtAudio::State state) const {
if (state == QtAudio::StoppedState && m_source->error() != QtAudio::NoError) {
switch (m_source->error()) {
case QtAudio::OpenError:
qWarning() << "BeatTracker: failed to open audio device";
break;
case QtAudio::IOError:
qWarning() << "BeatTracker: an error occurred during read/write of audio device";
break;
case QtAudio::UnderrunError:
qWarning() << "BeatTracker: audio data is not being fed to audio device fast enough";
break;
case QtAudio::FatalError:
qCritical() << "BeatTracker: fatal error in audio device";
break;
default:
break;
}
}
}
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