squeezelite-esp32/components/spotify/cspot/bell/main/audio-dsp/Gain.cpp

#include "Gain.h"

using namespace bell;

Gain::Gain() : AudioTransform()
{
    this->gainFactor = 1.0f;
    this->filterType = "gain";
}

void Gain::configure(std::vector<int> channels, float gainDB)
{
    this->channels = channels;
    this->gainDb = gainDB;
    this->gainFactor = std::pow(10.0f, gainDB / 20.0f);
}

std::unique_ptr<StreamInfo> Gain::process(std::unique_ptr<StreamInfo> data)
{
    std::scoped_lock lock(this->accessMutex);
    for (int i = 0; i < data->numSamples; i++)
    {
        // Apply gain to all channels
        for (auto &channel : channels)
        {
            data->data[channel][i] *= gainFactor;
        }
    }

    return data;
}