AFV initial commit

src/blacksound/sampleprovider/equalizersampleprovider.cpp

@@ -0,0 +1,51 @@
+#include "equalizersampleprovider.h"
+
+EqualizerSampleProvider::EqualizerSampleProvider(ISampleProvider *sourceProvider, EqualizerPresets preset, QObject *parent) :
+    ISampleProvider(parent)
+{
+    m_sourceProvider = sourceProvider;
+    setupPreset(preset);
+}
+
+int EqualizerSampleProvider::readSamples(QVector<qint16> &samples, qint64 count)
+{
+    int samplesRead = m_sourceProvider->readSamples(samples, count);
+    if (m_bypass) return samplesRead;
+
+    for (int n = 0; n < samplesRead; n++)
+    {
+        // TODO stereo implementation
+
+        for (int band = 0; band < m_filters.size(); band++)
+        {
+            float s = samples[n] / 32768.0f;
+            s = m_filters[band].process(s);
+            samples[n] = s * 32768;
+        }
+
+        samples[n] *= m_outputGain;
+    }
+    return samplesRead;
+}
+
+void EqualizerSampleProvider::setupPreset(EqualizerPresets preset)
+{
+    switch (preset)
+    {
+    case VHFEmulation:
+        m_filters.push_back(BiQuadFilter(BiQuadFilterType::HighPass, 44100, 450, 1.0f));
+        m_filters.push_back(BiQuadFilter(BiQuadFilterType::Peak, 44100, 2200, 0.25, 13.0f));
+        m_filters.push_back(BiQuadFilter(BiQuadFilterType::LowPass, 44100, 3000, 1.0f));
+        break;
+    }
+}
+
+double EqualizerSampleProvider::outputGain() const
+{
+    return m_outputGain;
+}
+
+void EqualizerSampleProvider::setOutputGain(double outputGain)
+{
+    m_outputGain = outputGain;
+}