PluginProcessor.cpp

/* TubeScreamer - Guitar Overdrive pedal simulation created with faust and JUCE
 * Copyright (C) 2021 Barabas Raffai
 *
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include "PluginProcessor.h"
#include "PluginEditor.h"
#include "TubeScreamer.h"
#include "FaustParameterFloat.h"

//==============================================================================
AudioPluginAudioProcessor::AudioPluginAudioProcessor()
     : AudioProcessor (BusesProperties()
                     #if ! JucePlugin_IsMidiEffect
                      #if ! JucePlugin_IsSynth
                       .withInput  ("Input",  juce::AudioChannelSet::stereo(), true)
                      #endif
                       .withOutput ("Output", juce::AudioChannelSet::stereo(), true)
                     #endif
                       ), parameters(*this, nullptr, juce::Identifier("parameters"),
                           {
                           std::make_unique<FaustParameterFloat> (&fUI,
                                   "gain",
                                   "Gain",
                                   0.f,
                                   1.f,
                                   0.5f),
                           std::make_unique<FaustParameterFloat> (&fUI,
                                   "tone",
                                   "Tone",
                                   0.f,
                                   1.f,
                                   0.5f),
                           std::make_unique<FaustParameterFloat> (&fUI,
                                   "volume",
                                   "Volume",
                                   0.f,
                                   1.f,
                                   0.5f),
                           }), currentBufferSize(0)

{
    fDSP = new mydsp();
    fUI = new MapUI();
    fDSP->buildUserInterface(fUI);

    for (int channel = 0; channel < 2; ++channel) {
        inputs[channel] = nullptr;
        outputs[channel] = nullptr;
    }
}

AudioPluginAudioProcessor::~AudioPluginAudioProcessor()
{
    delete fDSP;
    delete fUI;
}

//==============================================================================
const juce::String AudioPluginAudioProcessor::getName() const
{
    return JucePlugin_Name;
}

bool AudioPluginAudioProcessor::acceptsMidi() const
{
   #if JucePlugin_WantsMidiInput
    return true;
   #else
    return false;
   #endif
}

bool AudioPluginAudioProcessor::producesMidi() const
{
   #if JucePlugin_ProducesMidiOutput
    return true;
   #else
    return false;
   #endif
}

bool AudioPluginAudioProcessor::isMidiEffect() const
{
   #if JucePlugin_IsMidiEffect
    return true;
   #else
    return false;
   #endif
}

double AudioPluginAudioProcessor::getTailLengthSeconds() const
{
    return 0.0;
}

int AudioPluginAudioProcessor::getNumPrograms()
{
    return 1;   // NB: some hosts don't cope very well if you tell them there are 0 programs,
                // so this should be at least 1, even if you're not really implementing programs.
}

int AudioPluginAudioProcessor::getCurrentProgram()
{
    return 0;
}

void AudioPluginAudioProcessor::setCurrentProgram (int index)
{
    juce::ignoreUnused (index);
}

const juce::String AudioPluginAudioProcessor::getProgramName (int index)
{
    juce::ignoreUnused (index);
    return {};
}

void AudioPluginAudioProcessor::changeProgramName (int index, const juce::String& newName)
{
    juce::ignoreUnused (index, newName);
}

//==============================================================================
void AudioPluginAudioProcessor::prepareToPlay (double sampleRate, int samplesPerBlock)
{
    fDSP->init(sampleRate);

    if(currentBufferSize != samplesPerBlock)
    {
        for (int channel = 0; channel < 2; ++channel) {
            if(inputs[channel] != nullptr)
            {
                delete[] inputs[channel];
                inputs[channel] = nullptr;
            }

            if(outputs[channel] != nullptr)
            {
                delete[] outputs[channel];
                outputs[channel] = nullptr;
            }

            outputs[channel] = new float[(size_t)samplesPerBlock];
            inputs[channel] = new float[(size_t)samplesPerBlock];
        }

        currentBufferSize = samplesPerBlock;
    }
}

void AudioPluginAudioProcessor::releaseResources()
{
    for (int channel = 0; channel < 2; ++channel) {
        delete[] inputs[channel];
        delete[] outputs[channel];

        inputs[channel] = nullptr;
        outputs[channel] = nullptr;
    }

    currentBufferSize = 0;
}

bool AudioPluginAudioProcessor::isBusesLayoutSupported (const BusesLayout& layouts) const
{
  #if JucePlugin_IsMidiEffect
    juce::ignoreUnused (layouts);
    return true;
  #else
    // This is the place where you check if the layout is supported.
    // In this template code we only support mono or stereo.
    // Some plugin hosts, such as certain GarageBand versions, will only
    // load plugins that support stereo bus layouts.
    if (layouts.getMainOutputChannelSet() != juce::AudioChannelSet::mono()
     && layouts.getMainOutputChannelSet() != juce::AudioChannelSet::stereo())
        return false;

    // This checks if the input layout matches the output layout
   #if ! JucePlugin_IsSynth
    if (layouts.getMainOutputChannelSet() != layouts.getMainInputChannelSet())
        return false;
   #endif

    return true;
  #endif
}

void AudioPluginAudioProcessor::processBlock (juce::AudioBuffer<float>& buffer,
                                              juce::MidiBuffer& midiMessages)
{
    juce::ignoreUnused(midiMessages);

    juce::ScopedNoDenormals noDenormals;
    auto totalNumInputChannels = getTotalNumInputChannels();
    auto totalNumOutputChannels = getTotalNumOutputChannels();

    for (int channel = 0; channel < totalNumInputChannels; ++channel) {
        for (int i = 0; i < buffer.getNumSamples(); i++) {
            inputs[channel][i] = *buffer.getWritePointer(channel,i);
        }
    }

    fDSP->compute(buffer.getNumSamples(),inputs,outputs);

    for (int channel = 0; channel < totalNumOutputChannels; ++channel) {
        for (int i = 0; i < buffer.getNumSamples(); i++) {
            *buffer.getWritePointer(channel,i) = outputs[channel][i];
        }
    }
}

//==============================================================================
bool AudioPluginAudioProcessor::hasEditor() const
{
    return true; // (change this to false if you choose to not supply an editor)
}

juce::AudioProcessorEditor* AudioPluginAudioProcessor::createEditor()
{
    return new AudioPluginAudioProcessorEditor (*this);
}

//==============================================================================
void AudioPluginAudioProcessor::getStateInformation (juce::MemoryBlock& destData)
{
    auto state = parameters.copyState();
    std::unique_ptr<juce::XmlElement> xml (state.createXml());
    copyXmlToBinary (*xml, destData);
}

void AudioPluginAudioProcessor::setStateInformation (const void* data, int sizeInBytes)
{
    std::unique_ptr<juce::XmlElement> xml (getXmlFromBinary (data, sizeInBytes));

    if (xml.get() != nullptr)
    {
        if (xml->hasTagName (parameters.state.getType()))
        {
            parameters.replaceState (juce::ValueTree::fromXml (*xml));
        }
    }
}

//==============================================================================
// This creates new instances of the plugin..
juce::AudioProcessor* JUCE_CALLTYPE createPluginFilter()
{
    return new AudioPluginAudioProcessor();
}