mixingsampleprovider.cpp

// SPDX-FileCopyrightText: Copyright (C) 2019 swift Project Community / Contributors
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1
 
#include "mixingsampleprovider.h"
 
#include "misc/metadatautils.h"
 
using namespace swift::misc;
 
namespace swift::sound::sample_provider
{
    CMixingSampleProvider::CMixingSampleProvider(QObject *parent) : ISampleProvider(parent)
    {
        const QString on = QStringLiteral("%1").arg(classNameShort(this));
        this->setObjectName(on);
    }
 
    void CMixingSampleProvider::addMixerInput(ISampleProvider *provider)
    {
        Q_ASSERT(provider);
        m_sources.append(provider);
 
        const QString on = QStringLiteral("%1 sources: %2").arg(classNameShort(this)).arg(m_sources.size());
        this->setObjectName(on);
    }
 
    int CMixingSampleProvider::readSamples(QVector<float> &samples, qint64 count)
    {
        samples.clear();
        samples.fill(0, static_cast<int>(count));
        int outputLen = 0;
 
        QVector<ISampleProvider *> finishedProviders;
        for (auto sampleProvider : m_sources)
        {
            QVector<float> sourceBuffer;
 
            const int len = sampleProvider->readSamples(sourceBuffer, count);
            for (int n = 0; n < len; n++) { samples[n] += sourceBuffer[n]; }
 
            outputLen = qMax(len, outputLen);
            if (sampleProvider->isFinished()) { finishedProviders.push_back(sampleProvider); }
        }
 
        for (ISampleProvider *sampleProvider : finishedProviders)
        {
            sampleProvider->deleteLater();
            m_sources.removeAll(sampleProvider);
        }
 
        return outputLen;
    }
} // namespace swift::sound::sample_provider