Implement IAudioProcessor::getBusArrangement()

src/common/logging/vst3.cpp

@@ -162,6 +162,15 @@ void Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+void Vst3Logger::log_request(bool is_host_vst,
+                             const YaComponent::GetBusArrangement& request) {
+    log_request_base(is_host_vst, [&](auto& message) {
+        message << "<IAudioProcessor* #" << request.instance_id
+                << ">::getBusArrangement(dir = " << request.dir
+                << ", index = " << request.index << ", &arr";
+    });
+}
+
 void Vst3Logger::log_request(bool is_host_vst,
                              const YaPluginFactory::Construct&) {
     log_request_base(is_host_vst,
@@ -237,6 +246,17 @@ void Vst3Logger::log_response(bool is_host_vst,
     });
 }
 
+void Vst3Logger::log_response(
+    bool is_host_vst,
+    const YaComponent::GetBusArrangementResponse& response) {
+    log_response_base(is_host_vst, [&](auto& message) {
+        message << response.result.string();
+        if (response.result.native() == Steinberg::kResultOk) {
+            message << ", <SpeakerArrangement>";
+        }
+    });
+}
+
 void Vst3Logger::log_response(bool is_host_vst,
                               const YaPluginFactory::ConstructArgs& args) {
     log_response_base(is_host_vst, [&](auto& message) {

src/common/logging/vst3.h

@@ -69,6 +69,7 @@ class Vst3Logger {
     void log_request(bool is_host_vst, const YaComponent::SetState&);
     void log_request(bool is_host_vst, const YaComponent::GetState&);
     void log_request(bool is_host_vst, const YaComponent::SetBusArrangements&);
+    void log_request(bool is_host_vst, const YaComponent::GetBusArrangement&);
     void log_request(bool is_host_vst, const YaPluginFactory::Construct&);
     void log_request(bool is_host_vst, const YaPluginFactory::SetHostContext&);
     void log_request(bool is_host_vst, const WantsConfiguration&);
@@ -81,6 +82,8 @@ class Vst3Logger {
     void log_response(bool is_host_vst,
                       const YaComponent::GetRoutingInfoResponse&);
     void log_response(bool is_host_vst, const YaComponent::GetStateResponse&);
+    void log_response(bool is_host_vst,
+                      const YaComponent::GetBusArrangementResponse&);
     void log_response(bool is_host_vst, const YaPluginFactory::ConstructArgs&);
     void log_response(bool is_host_vst, const Configuration&);
 

src/common/serialization/vst3.h

@@ -70,6 +70,7 @@ using ControlRequest = std::variant<YaComponent::Construct,
                                     YaComponent::SetState,
                                     YaComponent::GetState,
                                     YaComponent::SetBusArrangements,
+                                    YaComponent::GetBusArrangement,
                                     YaPluginFactory::Construct,
                                     YaPluginFactory::SetHostContext>;
 

src/common/serialization/vst3/component.h

@@ -457,6 +457,45 @@ class YaComponent : public Steinberg::Vst::IComponent,
                        int32 numIns,
                        Steinberg::Vst::SpeakerArrangement* outputs,
                        int32 numOuts) override = 0;
+
+    /**
+     * The response code and written state for a call to
+     * `IAudioProcessor::getBusArrangement(dir, index, arr)`.
+     */
+    struct GetBusArrangementResponse {
+        UniversalTResult result;
+        Steinberg::Vst::SpeakerArrangement updated_arr;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.object(result);
+            s.value8b(updated_arr);
+        }
+    };
+
+    /**
+     * Message to pass through a call to
+     * `IAudioProcessor::getBusArrangement(dir, index, arr)` to the Wine
+     * plugin host.
+     */
+    struct GetBusArrangement {
+        using Response = GetBusArrangementResponse;
+
+        native_size_t instance_id;
+
+        Steinberg::Vst::BusDirection dir;
+        int32 index;
+        Steinberg::Vst::SpeakerArrangement arr;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.value4b(dir);
+            s.value4b(index);
+            s.value8b(arr);
+        }
+    };
+
     virtual tresult PLUGIN_API
     getBusArrangement(Steinberg::Vst::BusDirection dir,
                       int32 index,

src/plugin/bridges/vst3-impls/component.cpp

@@ -180,9 +180,15 @@ tresult PLUGIN_API YaComponentPluginImpl::getBusArrangement(
     Steinberg::Vst::BusDirection dir,
     int32 index,
     Steinberg::Vst::SpeakerArrangement& arr) {
-    // TODO: Implement
-    bridge.logger.log("TODO: IAudioProcessor::getBusArrangement()");
-    return Steinberg::kNotImplemented;
+    const GetBusArrangementResponse response = bridge.send_message(
+        YaComponent::GetBusArrangement{.instance_id = arguments.instance_id,
+                                       .dir = dir,
+                                       .index = index,
+                                       .arr = arr});
+
+    arr = response.updated_arr;
+
+    return response.result.native();
 }
 
 tresult PLUGIN_API

src/wine-host/bridges/vst3.cpp

@@ -175,6 +175,16 @@ void Vst3Bridge::run() {
                         request.inputs.data(), request.num_ins,
                         request.outputs.data(), request.num_outs);
             },
+            [&](YaComponent::GetBusArrangement& request)
+                -> YaComponent::GetBusArrangement::Response {
+                const tresult result =
+                    component_instances[request.instance_id]
+                        .audio_processor->getBusArrangement(
+                            request.dir, request.index, request.arr);
+
+                return YaComponent::GetBusArrangementResponse{
+                    .result = result, .updated_arr = request.arr};
+            },
             [&](const YaPluginFactory::Construct&)
                 -> YaPluginFactory::Construct::Response {
                 return YaPluginFactory::ConstructArgs(