Cardinal/src/PluginDriver.hpp

/*
 * DISTRHO Cardinal Plugin
 * Copyright (C) 2021 Filipe Coelho <falktx@falktx.com>
 *
 * 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 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.
 *
 * For a full copy of the GNU General Public License see the LICENSE file.
 */

#pragma once

#include "PluginContext.hpp"

START_NAMESPACE_DISTRHO

// -----------------------------------------------------------------------------------------------------------

struct CardinalAudioDevice : rack::audio::Device
{
    CardinalBasePlugin* const fPlugin;

    CardinalAudioDevice(CardinalBasePlugin* const plugin)
        : fPlugin(plugin) {}

    std::string getName() override
    {
        return "Cardinal";
    }

    int getNumInputs() override
    {
        return DISTRHO_PLUGIN_NUM_INPUTS;
    }

    int getNumOutputs() override
    {
        return DISTRHO_PLUGIN_NUM_OUTPUTS;
    }

    int getBlockSize() override
    {
        return fPlugin->getBufferSize();
    }

    float getSampleRate() override
    {
        return fPlugin->getSampleRate();
    }

    std::set<int> getBlockSizes() override
    {
        return std::set<int>({ getBlockSize() });
    }

    std::set<float> getSampleRates() override
    {
        return std::set<float>({ getSampleRate() });
    }

    void setBlockSize(int) override {}
    void setSampleRate(float) override {}
};

// -----------------------------------------------------------------------------------------------------------

struct CardinalAudioDriver : rack::audio::Driver
{
    CardinalAudioDriver() {}

    std::string getName() override
    {
        return "Plugin Driver";
    }

    std::vector<int> getDeviceIds() override
    {
        return std::vector<int>({ 0 });
    }

    int getDefaultDeviceId() override
    {
        return 0;
    }

    std::string getDeviceName(int) override
    {
        return "Plugin Device";
    }

    int getDeviceNumInputs(int) override
    {
        return DISTRHO_PLUGIN_NUM_INPUTS;
    }

    int getDeviceNumOutputs(int) override
    {
        return DISTRHO_PLUGIN_NUM_OUTPUTS;
    }

    rack::audio::Device* subscribe(int, rack::audio::Port* const port) override
    {
        CardinalPluginContext* const pluginContext = reinterpret_cast<CardinalPluginContext*>(port->context);
        DISTRHO_SAFE_ASSERT_RETURN(pluginContext != nullptr, nullptr);

        CardinalBasePlugin* const plugin = reinterpret_cast<CardinalBasePlugin*>(pluginContext->plugin);
        DISTRHO_SAFE_ASSERT_RETURN(plugin != nullptr, nullptr);

        if (! plugin->canAssignAudioDevice())
            throw rack::Exception("Plugin driver only allows one audio device to be used simultaneously");

        CardinalAudioDevice* const device = new CardinalAudioDevice(plugin);
        device->subscribe(port);

        if (plugin->isActive())
            device->onStartStream();

        plugin->assignAudioDevice(device);
        return device;
    }

    void unsubscribe(int, rack::audio::Port* const port) override
    {
        CardinalAudioDevice* const device = reinterpret_cast<CardinalAudioDevice*>(port->device);
        DISTRHO_SAFE_ASSERT_RETURN(device != nullptr,);

        CardinalPluginContext* const pluginContext = reinterpret_cast<CardinalPluginContext*>(port->context);
        DISTRHO_SAFE_ASSERT_RETURN(pluginContext != nullptr,);

        CardinalBasePlugin* const plugin = reinterpret_cast<CardinalBasePlugin*>(pluginContext->plugin);
        DISTRHO_SAFE_ASSERT_RETURN(plugin != nullptr,);

        if (plugin->clearAudioDevice(device))
        {
            device->onStopStream();
            device->unsubscribe(port);
            delete device;
        }
    }
};

// -----------------------------------------------------------------------------------------------------------

struct CardinalMidiInputDevice : rack::midi::InputDevice
{
    CardinalBasePlugin* const fPlugin;
    rack::midi::Message msg;

    CardinalMidiInputDevice(CardinalBasePlugin* const plugin)
        : fPlugin(plugin)
    {
        msg.bytes.reserve(0xff);
    }

    std::string getName() override
    {
        return "Cardinal";
    }

    void handleMessagesFromHost(const MidiEvent* const midiEvents, const uint32_t midiEventCount)
    {
        if (subscribed.size() == 0)
            return;

        for (uint32_t i=0; i<midiEventCount; ++i)
        {
            const MidiEvent& midiEvent(midiEvents[i]);
            const uint8_t* data;

            if (midiEvent.size > MidiEvent::kDataSize)
            {
                data = midiEvent.dataExt;
                msg.bytes.reserve(midiEvent.size);
            }
            else
            {
                data = midiEvent.data;
            }

            msg.frame = midiEvent.frame;
            std::memcpy(msg.bytes.data(), data, midiEvent.size);

            onMessage(msg);
        }
    }
};

// -----------------------------------------------------------------------------------------------------------

struct CardinalMidiOutputDevice : rack::midi::OutputDevice
{
    CardinalBasePlugin* const fPlugin;
    MidiEvent fQueue[128];
    Mutex fQueueMutex;
    uint8_t fQueueIndex;

    CardinalMidiOutputDevice(CardinalBasePlugin* const plugin)
        : fPlugin(plugin),
          fQueueIndex(0) {}

    std::string getName() override
    {
        return "Cardinal";
    }

    void processMessages()
    {
        const MutexLocker cml(fQueueMutex);

        for (uint8_t i=0; i<fQueueIndex; ++i)
            fPlugin->writeMidiEvent(fQueue[i]);

        fQueueIndex = 0;
    }

    void sendMessage(const rack::midi::Message& message) override
    {
        if (message.bytes.size() < 3) // FIXME
            return;
        if ((message.bytes[0] & 0xf0) == 0xf0)
            return;
        if (fQueueIndex == 128)
            return;

        const MutexLocker cml(fQueueMutex);

        MidiEvent& event(fQueue[fQueueIndex++]);
        event.frame = message.frame < 0 ? 0 : (message.frame - fPlugin->context->engine->getBlockFrame());
        event.size = 3; // FIXME
        std::memcpy(event.data, message.bytes.data(), event.size);
    }
};

// -----------------------------------------------------------------------------------------------------------

struct CardinalMidiDriver : rack::midi::Driver
{
    CardinalMidiDriver() {}

    std::string getName() override
    {
        return "Plugin Driver";
    }

    std::vector<int> getInputDeviceIds() override
    {
        return std::vector<int>({ 0 });
    }

    std::vector<int> getOutputDeviceIds() override
    {
        return std::vector<int>({ 0 });
    }

    int getDefaultInputDeviceId() override
    {
        return 0;
    }

    int getDefaultOutputDeviceId() override
    {
        return 0;
    }

    std::string getInputDeviceName(int) override
    {
        return "Plugin Device";
    }

    std::string getOutputDeviceName(int) override
    {
        return "Plugin Device";
    }

    rack::midi::InputDevice* subscribeInput(int, rack::midi::Input* const input) override
    {
        CardinalPluginContext* const pluginContext = reinterpret_cast<CardinalPluginContext*>(input->context);
        DISTRHO_SAFE_ASSERT_RETURN(pluginContext != nullptr, nullptr);

        CardinalBasePlugin* const plugin = reinterpret_cast<CardinalBasePlugin*>(pluginContext->plugin);
        DISTRHO_SAFE_ASSERT_RETURN(plugin != nullptr, nullptr);

        CardinalMidiInputDevice* const device = new CardinalMidiInputDevice(plugin);
        device->subscribe(input);

        plugin->addMidiInput(device);
        return device;
    }

    rack::midi::OutputDevice* subscribeOutput(int, rack::midi::Output* const output) override
    {
        CardinalPluginContext* const pluginContext = reinterpret_cast<CardinalPluginContext*>(output->context);
        DISTRHO_SAFE_ASSERT_RETURN(pluginContext != nullptr, nullptr);

        CardinalBasePlugin* const plugin = reinterpret_cast<CardinalBasePlugin*>(pluginContext->plugin);
        DISTRHO_SAFE_ASSERT_RETURN(plugin != nullptr, nullptr);

        if (! plugin->canAssignMidiOutputDevice())
            throw rack::Exception("Plugin driver only allows one midi output device to be used simultaneously");

        CardinalMidiOutputDevice* const device = new CardinalMidiOutputDevice(plugin);
        device->subscribe(output);

        plugin->assignMidiOutputDevice(device);
        return device;
    }

    void unsubscribeInput(int, rack::midi::Input* const input) override
    {
        CardinalMidiInputDevice* const device = reinterpret_cast<CardinalMidiInputDevice*>(input->device);
        DISTRHO_SAFE_ASSERT_RETURN(device != nullptr,);

        CardinalPluginContext* const pluginContext = reinterpret_cast<CardinalPluginContext*>(input->context);
        DISTRHO_SAFE_ASSERT_RETURN(pluginContext != nullptr,);

        CardinalBasePlugin* const plugin = reinterpret_cast<CardinalBasePlugin*>(pluginContext->plugin);
        DISTRHO_SAFE_ASSERT_RETURN(plugin != nullptr,);

        plugin->removeMidiInput(device);
        device->unsubscribe(input);
        delete device;
    }

    void unsubscribeOutput(int, rack::midi::Output* const output) override
    {
        CardinalMidiOutputDevice* const device = reinterpret_cast<CardinalMidiOutputDevice*>(output->device);
        DISTRHO_SAFE_ASSERT_RETURN(device != nullptr,);

        CardinalPluginContext* const pluginContext = reinterpret_cast<CardinalPluginContext*>(output->context);
        DISTRHO_SAFE_ASSERT_RETURN(pluginContext != nullptr,);

        CardinalBasePlugin* const plugin = reinterpret_cast<CardinalBasePlugin*>(pluginContext->plugin);
        DISTRHO_SAFE_ASSERT_RETURN(plugin != nullptr,);

        if (plugin->clearMidiOutputDevice(device))
        {
            device->unsubscribe(output);
            delete device;
        }
    }
};

// -----------------------------------------------------------------------------------------------------------

END_NAMESPACE_DISTRHO