refactor: Rename BlackSound to swift::sound

src/sound/sampleprovider/mixingsampleprovider.cpp

@@ -0,0 +1,59 @@
+// 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 "blackmisc/metadatautils.h"
+
+using namespace BlackMisc;
+
+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 (int i = 0; i < m_sources.size(); i++)
+        {
+            ISampleProvider *sampleProvider = m_sources.at(i);
+            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;
+    }
+} // ns