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Robbert van der Helm
104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
// yabridge: a Wine VST bridge
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// Copyright (C) 2020 Robbert van der Helm
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#pragma once
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#include "native-includes.h"
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// `native-includes.h` has to be included before any other files as otherwise we
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// might get the wrong version of certain libraries
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#define WIN32_LEAN_AND_MEAN
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#include <vestige/aeffect.h>
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#include <windows.h>
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#include <thread>
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/**
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* This handles the communication between the Linux native VST plugin and the
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* Wine VST host. The functions below should be used as callback functions in an
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* `AEffect` object.
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*/
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class PluginBridge {
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public:
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/**
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* Initializes the Windows VST plugin and set up communication with the
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* native Linux VST plugin.
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*
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* @param plugin_dll_path A (Unix style) path to the VST plugin .dll file to
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* load.
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* @param socket_endpoint_path A (Unix style) path to the Unix socket
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* endpoint the native VST plugin created to communicate over.
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*
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* @throw std::runtime_error Thrown when the VST plugin could not be loaded,
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* or if communication could not be set up.
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*/
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PluginBridge(std::string plugin_dll_path, std::string socket_endpoint_path);
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/**
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* Block the main thread until the plugin shuts down.
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*/
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void wait();
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intptr_t host_callback(AEffect*, int32_t, int32_t, intptr_t, void*, float);
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private:
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/**
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* The shared library handle of the VST plugin. I sadly could not get
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* Boost.DLL to work here, so we'll just load the VST plugisn by hand.
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*/
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std::unique_ptr<std::remove_pointer_t<HMODULE>, decltype(&FreeLibrary)>
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plugin_handle;
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/**
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* The loaded plugin's `AEffect` struct, obtained using the above library
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* handle.
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*/
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AEffect* plugin;
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boost::asio::io_context io_context;
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boost::asio::local::stream_protocol::endpoint socket_endpoint;
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// The naming convention for these sockets is `<from>_<to>_<event>`. For
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// instance the socket named `host_vst_dispatch` forwards
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// `AEffect.dispatch()` calls from the native VST host to the Windows VST
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// plugin (through the Wine VST host).
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boost::asio::local::stream_protocol::socket host_vst_dispatch;
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boost::asio::local::stream_protocol::socket vst_host_callback;
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/**
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* Used for both `getParameter` and `setParameter` since they mostly
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* overlap.
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*/
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boost::asio::local::stream_protocol::socket host_vst_parameters;
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/**
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* This socket only handles updates of the `AEffect` struct instead of
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* passing through function calls. It's also used during initialization to
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* pass the Wine plugin's information to the host.
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*/
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boost::asio::local::stream_protocol::socket vst_host_aeffect;
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/**
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* The thread that handles dispatch events from the host.
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*/
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std::thread dispatch_handler;
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/**
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* The thread that responds to `getParameter` and `setParameter` requests.
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*/
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std::thread parameters_handler;
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// TODO: Set up process and processReplacing callback handlers
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};
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