mirror of
https://github.com/robbert-vdh/yabridge.git
synced 2026-05-07 03:50:11 +02:00
Robbert van der Helm
646 lines
28 KiB
C++
646 lines
28 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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#include "vst2.h"
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#include "../../common/communication/vst2.h"
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#include "../utils.h"
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// I'd rather use std::filesystem instead, but Boost.Process depends on
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// boost::filesystem
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namespace fs = boost::filesystem;
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intptr_t dispatch_proxy(AEffect*, int, int, intptr_t, void*, float);
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void process_proxy(AEffect*, float**, float**, int);
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void process_replacing_proxy(AEffect*, float**, float**, int);
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void process_double_replacing_proxy(AEffect*, double**, double**, int);
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void set_parameter_proxy(AEffect*, int, float);
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float get_parameter_proxy(AEffect*, int);
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/**
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* Fetch the bridge instance stored in an unused pointer from a VST plugin. This
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* is sadly needed as a workaround to avoid using globals since we need free
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* function pointers to interface with the VST C API.
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*/
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Vst2PluginBridge& get_bridge_instance(const AEffect& plugin) {
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return *static_cast<Vst2PluginBridge*>(plugin.ptr3);
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}
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Vst2PluginBridge::Vst2PluginBridge(audioMasterCallback host_callback)
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: PluginBridge(PluginType::vst2,
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find_vst_plugin(),
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[](boost::asio::io_context& io_context) {
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return Vst2Sockets<std::jthread>(
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io_context,
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generate_endpoint_base(find_vst_plugin()
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.filename()
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.replace_extension("")
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.string()),
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true);
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}),
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// All the fields should be zero initialized because
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// `Vst2PluginInstance::vstAudioMasterCallback` from Bitwig's plugin
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// bridge will crash otherwise
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plugin(),
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host_callback_function(host_callback),
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// TODO: This is UB, use composition with `generic_logger` instead
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logger(static_cast<Vst2Logger&&>(Logger::create_from_environment(
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create_logger_prefix(sockets.base_dir)))) {
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log_init_message();
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// TODO: Also move his to `PluginHost`
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#ifndef WITH_WINEDBG
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// If the Wine process fails to start, then nothing will connect to the
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// sockets and we'll be hanging here indefinitely. To prevent this, we'll
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// periodically poll whether the Wine process is still running, and throw
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// when it is not. The alternative would be to rewrite this to using
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// `async_accept`, Boost.Asio timers, and another IO context, but I feel
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// like this a much simpler solution.
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host_guard_handler = std::jthread([&](std::stop_token st) {
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using namespace std::literals::chrono_literals;
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while (!st.stop_requested()) {
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if (!plugin_host->running()) {
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logger.log(
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"The Wine host process has exited unexpectedly. Check the "
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"output above for more information.");
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std::terminate();
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}
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std::this_thread::sleep_for(20ms);
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}
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});
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#endif
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// This will block until all sockets have been connected to by the Wine VST
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// host
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sockets.connect();
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#ifndef WITH_WINEDBG
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host_guard_handler.request_stop();
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#endif
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// Set up all pointers for our `AEffect` struct. We will fill this with data
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// from the VST plugin loaded in Wine at the end of this constructor.
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plugin.ptr3 = this;
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plugin.dispatcher = dispatch_proxy;
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plugin.process = process_proxy;
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plugin.setParameter = set_parameter_proxy;
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plugin.getParameter = get_parameter_proxy;
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plugin.processReplacing = process_replacing_proxy;
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plugin.processDoubleReplacing = process_double_replacing_proxy;
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// For our communication we use simple threads and blocking operations
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// instead of asynchronous IO since communication has to be handled in
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// lockstep anyway
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host_callback_handler = std::jthread([&]() {
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sockets.vst_host_callback.receive_events(
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std::pair<Vst2Logger&, bool>(logger, false),
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[&](Event& event, bool /*on_main_thread*/) {
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// MIDI events sent from the plugin back to the host are a
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// special case here. They have to sent during the
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// `processReplacing()` function or else the host will ignore
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// them. Because of this we'll temporarily save any MIDI events
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// we receive here, and then we'll actually send them to the
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// host at the end of the `process_replacing()` function.
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if (event.opcode == audioMasterProcessEvents) {
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std::lock_guard lock(incoming_midi_events_mutex);
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incoming_midi_events.push_back(
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std::get<DynamicVstEvents>(event.payload));
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EventResult response{.return_value = 1,
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.payload = nullptr,
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.value_payload = std::nullopt};
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return response;
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} else {
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return passthrough_event(&plugin, host_callback_function,
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event);
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}
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});
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});
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// Read the plugin's information from the Wine process. This can only be
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// done after we started accepting host callbacks as the plugin will likely
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// call these during its initialization. Any further updates will be sent
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// over the `dispatcher()` socket. This would happen whenever the plugin
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// calls `audioMasterIOChanged()` and after the host calls `effOpen()`.
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const auto initialization_data =
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sockets.host_vst_control.receive_single<EventResult>();
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const auto initialized_plugin =
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std::get<AEffect>(initialization_data.payload);
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// After receiving the `AEffect` values we'll want to send the configuration
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// back to complete the startup process
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sockets.host_vst_control.send(config);
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update_aeffect(plugin, initialized_plugin);
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}
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class DispatchDataConverter : DefaultDataConverter {
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public:
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DispatchDataConverter(std::vector<uint8_t>& chunk_data,
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AEffect& plugin,
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VstRect& editor_rectangle)
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: chunk(chunk_data), plugin(plugin), rect(editor_rectangle) {}
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EventPayload read(const int opcode,
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const int index,
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const intptr_t value,
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const void* data) const override {
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// There are some events that need specific structs that we can't simply
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// serialize as a string because they might contain null bytes
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switch (opcode) {
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case effOpen:
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// This should not be needed, but some improperly coded plugins
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// such as the Roland Cloud plugins will initialize part of
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// their `AEffect` only after the host calls `effOpen`, instead
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// of during the initialization.
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return WantsAEffectUpdate{};
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break;
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case effEditGetRect:
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return WantsVstRect();
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break;
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case effEditOpen:
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// The host will have passed us an X11 window handle in the void
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// pointer. In the Wine VST host we'll create a Win32 window,
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// ask the plugin to embed itself in that and then embed that
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// window into this X11 window handle.
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return reinterpret_cast<size_t>(data);
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break;
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case effGetChunk:
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return WantsChunkBuffer();
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break;
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case effSetChunk: {
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const uint8_t* chunk_data = static_cast<const uint8_t*>(data);
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// When the host passes a chunk it will use the value parameter
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// to tell us its length
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return ChunkData{
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std::vector<uint8_t>(chunk_data, chunk_data + value)};
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} break;
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case effProcessEvents:
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return DynamicVstEvents(*static_cast<const VstEvents*>(data));
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break;
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case effGetInputProperties:
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case effGetOutputProperties:
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// In this case we can't simply pass an empty marker struct
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// because the host can have already populated this field with
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// data (or at least Bitwig does this)
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return *static_cast<const VstIOProperties*>(data);
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break;
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case effGetParameterProperties:
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return *static_cast<const VstParameterProperties*>(data);
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break;
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case effGetMidiKeyName:
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return *static_cast<const VstMidiKeyName*>(data);
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break;
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case effSetSpeakerArrangement:
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case effGetSpeakerArrangement:
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// This is the output speaker configuration, the `read_value()`
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// method below reads the input speaker configuration
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return DynamicSpeakerArrangement(
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*static_cast<const VstSpeakerArrangement*>(data));
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break;
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// Any VST host I've encountered has properly zeroed out these their
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// string buffers, but we'll add a list of opcodes that should
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// return a string just in case `DefaultDataConverter::read()` can't
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// figure it out.
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case effGetProgramName:
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case effGetParamLabel:
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case effGetParamDisplay:
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case effGetParamName:
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case effGetProgramNameIndexed:
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case effGetEffectName:
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case effGetVendorString:
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case effGetProductString:
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case effShellGetNextPlugin:
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return WantsString{};
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break;
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default:
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return DefaultDataConverter::read(opcode, index, value, data);
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break;
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}
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}
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std::optional<EventPayload> read_value(
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const int opcode,
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const intptr_t value) const override {
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switch (opcode) {
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case effSetSpeakerArrangement:
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case effGetSpeakerArrangement:
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// These two events are special in that they pass a pointer to
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// the output speaker configuration through the `data`
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// parameter, but then they also pass a pointer to the input
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// speaker configuration through the `value` parameter. This is
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// the only event that does this.
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return DynamicSpeakerArrangement(
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*static_cast<const VstSpeakerArrangement*>(
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reinterpret_cast<void*>(value)));
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break;
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default:
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return DefaultDataConverter::read_value(opcode, value);
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break;
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}
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}
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void write(const int opcode,
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void* data,
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const EventResult& response) const override {
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switch (opcode) {
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case effOpen: {
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// Update our `AEffect` object one last time for improperly
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// coded late initialing plugins. Hopefully the host will see
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// that the object is updated because these plugins don't send
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// any notification about this.
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const auto updated_plugin = std::get<AEffect>(response.payload);
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update_aeffect(plugin, updated_plugin);
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} break;
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case effEditGetRect: {
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// Either the plugin will have returned (a pointer to) their
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// editor dimensions, or they will not have written anything.
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if (std::holds_alternative<std::nullptr_t>(response.payload)) {
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return;
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}
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const auto new_rect = std::get<VstRect>(response.payload);
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rect = new_rect;
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*static_cast<VstRect**>(data) = ▭
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} break;
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case effGetChunk: {
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// Write the chunk data to some publically accessible place in
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// `Vst2PluginBridge` and write a pointer to that struct to the
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// data pointer
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const auto buffer =
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std::get<ChunkData>(response.payload).buffer;
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chunk.assign(buffer.begin(), buffer.end());
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*static_cast<uint8_t**>(data) = chunk.data();
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} break;
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case effGetInputProperties:
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case effGetOutputProperties: {
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// These opcodes pass the plugin some empty struct through the
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// data parameter that the plugin then fills with flags and
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// other data to describe an input or output channel.
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const auto properties =
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std::get<VstIOProperties>(response.payload);
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*static_cast<VstIOProperties*>(data) = properties;
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} break;
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case effGetParameterProperties: {
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// Same as the above
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const auto properties =
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std::get<VstParameterProperties>(response.payload);
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*static_cast<VstParameterProperties*>(data) = properties;
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} break;
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case effGetMidiKeyName: {
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// Ditto
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const auto properties =
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std::get<VstMidiKeyName>(response.payload);
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*static_cast<VstMidiKeyName*>(data) = properties;
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} break;
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case effGetSpeakerArrangement: {
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// The plugin will have updated the objects passed by the host
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// with its preferred output speaker configuration if it
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// supports this. The same thing happens for the input speaker
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// configuration in `write_value()`.
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auto speaker_arrangement =
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std::get<DynamicSpeakerArrangement>(response.payload);
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// Reconstruct a dynamically sized `VstSpeakerArrangement`
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// object to a buffer, and write back the results to the data
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// parameter.
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VstSpeakerArrangement* output =
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static_cast<VstSpeakerArrangement*>(data);
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std::vector<uint8_t> reconstructed_object =
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speaker_arrangement.as_raw_data();
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std::copy(reconstructed_object.begin(),
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reconstructed_object.end(),
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reinterpret_cast<uint8_t*>(output));
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} break;
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default:
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DefaultDataConverter::write(opcode, data, response);
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break;
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}
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}
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intptr_t return_value(const int opcode,
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const intptr_t original) const override {
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return DefaultDataConverter::return_value(opcode, original);
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}
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void write_value(const int opcode,
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intptr_t value,
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const EventResult& response) const override {
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switch (opcode) {
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case effGetSpeakerArrangement: {
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// Same as the above, but now for the input speaker
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// configuration object under the `value` pointer
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auto speaker_arrangement =
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std::get<DynamicSpeakerArrangement>(response.payload);
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VstSpeakerArrangement* output =
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static_cast<VstSpeakerArrangement*>(
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reinterpret_cast<void*>(value));
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std::vector<uint8_t> reconstructed_object =
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speaker_arrangement.as_raw_data();
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std::copy(reconstructed_object.begin(),
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reconstructed_object.end(),
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reinterpret_cast<uint8_t*>(output));
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} break;
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default:
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return DefaultDataConverter::write_value(opcode, value,
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response);
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break;
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}
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}
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private:
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std::vector<uint8_t>& chunk;
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AEffect& plugin;
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VstRect& rect;
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};
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intptr_t Vst2PluginBridge::dispatch(AEffect* /*plugin*/,
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int opcode,
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int index,
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intptr_t value,
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void* data,
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float option) {
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// HACK: Ardour 5.X has a bug in its VST implementation where it calls the
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// plugin's dispatcher before the plugin has even finished
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// initializing. This has been fixed back in 2018, but there has not
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// been a release that contains the fix yet. This should be removed
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// once Ardour 6.0 gets released.
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// https://tracker.ardour.org/view.php?id=7668
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if (BOOST_UNLIKELY(plugin.magic == 0)) {
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logger.log_event(true, opcode, index, value, nullptr, option,
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std::nullopt);
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logger.log(
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" Warning: The host has dispatched an event before the plugin "
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"has finished initializing, ignoring the event. (are we running "
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"Ardour 5.X?)");
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logger.log_event_response(true, opcode, 0, nullptr, std::nullopt);
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return 0;
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}
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DispatchDataConverter converter(chunk_data, plugin, editor_rectangle);
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switch (opcode) {
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case effClose: {
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// Allow the plugin to handle its own shutdown, and then terminate
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// the process. Because terminating the Wine process will also
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// forcefully close all open sockets this will also terminate our
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// handler thread.
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intptr_t return_value = 0;
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try {
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// TODO: Add some kind of timeout?
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return_value = sockets.host_vst_dispatch.send_event(
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converter, std::pair<Vst2Logger&, bool>(logger, true),
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opcode, index, value, data, option);
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} catch (const boost::system::system_error& a) {
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// Thrown when the socket gets closed because the VST plugin
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// loaded into the Wine process crashed during shutdown
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logger.log("The plugin crashed during shutdown, ignoring");
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}
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plugin_host->terminate();
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// The `stop()` method will cause the IO context to just drop all of
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// its work immediately and not throw any exceptions that would have
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// been caused by pipes and sockets being closed.
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io_context.stop();
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delete this;
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return return_value;
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}; break;
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case effCanDo: {
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const std::string query(static_cast<const char*>(data));
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// NOTE: If the plugins returns `0xbeefXXXX` to this query, then
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// REAPER will pass a libSwell handle rather than an X11
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// window ID to `effEditOpen`. This is of course not going to
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// work when the GUI is handled using Wine so we'll ignore it.
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if (query == "hasCockosViewAsConfig") {
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logger.log_event(true, opcode, index, value, query, option,
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std::nullopt);
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logger.log("");
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logger.log(
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" The host has requested libSwell GUI support, which is");
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logger.log(" not supported when using Wine.");
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logger.log(
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" You can safely ignore this message; this is normal");
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logger.log(" when using REAPER.");
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logger.log("");
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logger.log_event_response(true, opcode, -1, nullptr,
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std::nullopt);
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return -1;
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}
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} break;
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}
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// We don't reuse any buffers here like we do for audio processing. This
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// would be useful for chunk data, but since that's only needed when saving
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// and loading plugin state it's much better to have bitsery or our
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// receiving function temporarily allocate a large enough buffer rather than
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// to have a bunch of allocated memory sitting around doing nothing.
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return sockets.host_vst_dispatch.send_event(
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converter, std::pair<Vst2Logger&, bool>(logger, true), opcode, index,
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value, data, option);
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}
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template <typename T, bool replacing>
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void Vst2PluginBridge::do_process(T** inputs, T** outputs, int sample_frames) {
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// The inputs and outputs arrays should be `[num_inputs][sample_frames]` and
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// `[num_outputs][sample_frames]` floats large respectfully.
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std::vector<std::vector<T>> input_buffers(plugin.numInputs,
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std::vector<T>(sample_frames));
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for (int channel = 0; channel < plugin.numInputs; channel++) {
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std::copy(inputs[channel], inputs[channel] + sample_frames,
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input_buffers[channel].begin());
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}
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const AudioBuffers request{input_buffers, sample_frames};
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sockets.host_vst_process_replacing.send(request, process_buffer);
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// Write the results back to the `outputs` arrays
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const auto response =
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sockets.host_vst_process_replacing.receive_single<AudioBuffers>(
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process_buffer);
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const auto& response_buffers =
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std::get<std::vector<std::vector<T>>>(response.buffers);
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assert(response_buffers.size() == static_cast<size_t>(plugin.numOutputs));
|
|
for (int channel = 0; channel < plugin.numOutputs; channel++) {
|
|
if constexpr (replacing) {
|
|
std::copy(response_buffers[channel].begin(),
|
|
response_buffers[channel].end(), outputs[channel]);
|
|
} else {
|
|
// The old `process()` function expects the plugin to add its output
|
|
// to the accumulated values in `outputs`. Since no host is ever
|
|
// going to call this anyways we won't even bother with a separate
|
|
// implementation and we'll just add `processReplacing()` results to
|
|
// `outputs`.
|
|
// We could use `std::execution::unseq` here but that would require
|
|
// linking to TBB and since this probably won't ever be used anyways
|
|
// that's a bit of a waste.
|
|
std::transform(response_buffers[channel].begin(),
|
|
response_buffers[channel].end(), outputs[channel],
|
|
outputs[channel],
|
|
[](const T& new_value, T& current_value) -> T {
|
|
return new_value + current_value;
|
|
});
|
|
}
|
|
}
|
|
|
|
// Plugins are allowed to send MIDI events during processing using a host
|
|
// callback. These have to be processed during the actual
|
|
// `processReplacing()` function or else the host will ignore them. To
|
|
// prevent these events from getting delayed by a sample we'll process them
|
|
// after the plugin is done processing audio rather than during the time
|
|
// we're still waiting on the plugin.
|
|
std::lock_guard lock(incoming_midi_events_mutex);
|
|
for (DynamicVstEvents& events : incoming_midi_events) {
|
|
host_callback_function(&plugin, audioMasterProcessEvents, 0, 0,
|
|
&events.as_c_events(), 0.0);
|
|
}
|
|
|
|
incoming_midi_events.clear();
|
|
}
|
|
|
|
void Vst2PluginBridge::process(AEffect* /*plugin*/,
|
|
float** inputs,
|
|
float** outputs,
|
|
int sample_frames) {
|
|
// Technically either `Vst2PluginBridge::process()` or
|
|
// `Vst2PluginBridge::process_replacing()` could actually call the other
|
|
// function on the plugin depending on what the plugin supports.
|
|
logger.log_trace(">> process() :: start");
|
|
do_process<float, false>(inputs, outputs, sample_frames);
|
|
logger.log_trace(" process() :: end");
|
|
}
|
|
|
|
void Vst2PluginBridge::process_replacing(AEffect* /*plugin*/,
|
|
float** inputs,
|
|
float** outputs,
|
|
int sample_frames) {
|
|
logger.log_trace(">> processReplacing() :: start");
|
|
do_process<float, true>(inputs, outputs, sample_frames);
|
|
logger.log_trace(" processReplacing() :: end");
|
|
}
|
|
|
|
void Vst2PluginBridge::process_double_replacing(AEffect* /*plugin*/,
|
|
double** inputs,
|
|
double** outputs,
|
|
int sample_frames) {
|
|
logger.log_trace(">> processDoubleReplacing() :: start");
|
|
do_process<double, true>(inputs, outputs, sample_frames);
|
|
logger.log_trace(" processDoubleReplacing() :: end");
|
|
}
|
|
|
|
float Vst2PluginBridge::get_parameter(AEffect* /*plugin*/, int index) {
|
|
logger.log_get_parameter(index);
|
|
|
|
const Parameter request{index, std::nullopt};
|
|
ParameterResult response;
|
|
|
|
// Prevent race conditions from `getParameter()` and `setParameter()` being
|
|
// called at the same time since they share the same socket
|
|
{
|
|
std::lock_guard lock(parameters_mutex);
|
|
sockets.host_vst_parameters.send(request);
|
|
|
|
response =
|
|
sockets.host_vst_parameters.receive_single<ParameterResult>();
|
|
}
|
|
|
|
logger.log_get_parameter_response(*response.value);
|
|
|
|
return *response.value;
|
|
}
|
|
|
|
void Vst2PluginBridge::set_parameter(AEffect* /*plugin*/,
|
|
int index,
|
|
float value) {
|
|
logger.log_set_parameter(index, value);
|
|
|
|
const Parameter request{index, value};
|
|
ParameterResult response;
|
|
|
|
{
|
|
std::lock_guard lock(parameters_mutex);
|
|
sockets.host_vst_parameters.send(request);
|
|
|
|
response =
|
|
sockets.host_vst_parameters.receive_single<ParameterResult>();
|
|
}
|
|
|
|
logger.log_set_parameter_response();
|
|
|
|
// This should not contain any values and just serve as an acknowledgement
|
|
assert(!response.value);
|
|
}
|
|
|
|
// The below functions are proxy functions for the methods defined in
|
|
// `Bridge.cpp`
|
|
|
|
intptr_t dispatch_proxy(AEffect* plugin,
|
|
int opcode,
|
|
int index,
|
|
intptr_t value,
|
|
void* data,
|
|
float option) {
|
|
return get_bridge_instance(*plugin).dispatch(plugin, opcode, index, value,
|
|
data, option);
|
|
}
|
|
|
|
void process_proxy(AEffect* plugin,
|
|
float** inputs,
|
|
float** outputs,
|
|
int sample_frames) {
|
|
return get_bridge_instance(*plugin).process(plugin, inputs, outputs,
|
|
sample_frames);
|
|
}
|
|
|
|
void process_replacing_proxy(AEffect* plugin,
|
|
float** inputs,
|
|
float** outputs,
|
|
int sample_frames) {
|
|
return get_bridge_instance(*plugin).process_replacing(
|
|
plugin, inputs, outputs, sample_frames);
|
|
}
|
|
|
|
void process_double_replacing_proxy(AEffect* plugin,
|
|
double** inputs,
|
|
double** outputs,
|
|
int sample_frames) {
|
|
return get_bridge_instance(*plugin).process_double_replacing(
|
|
plugin, inputs, outputs, sample_frames);
|
|
}
|
|
|
|
void set_parameter_proxy(AEffect* plugin, int index, float value) {
|
|
return get_bridge_instance(*plugin).set_parameter(plugin, index, value);
|
|
}
|
|
|
|
float get_parameter_proxy(AEffect* plugin, int index) {
|
|
return get_bridge_instance(*plugin).get_parameter(plugin, index);
|
|
}
|