Implement IAudioProcessor::setBusArrangements()

src/common/logging/vst3.cpp

@@ -151,6 +151,17 @@ void Vst3Logger::log_request(bool is_host_vst,
     });
 }
 
+void Vst3Logger::log_request(bool is_host_vst,
+                             const YaComponent::SetBusArrangements& request) {
+    log_request_base(is_host_vst, [&](auto& message) {
+        message << "<IAudioProcessor* #" << request.instance_id
+                << ">::setBusArrangements(inputs = [SpeakerArrangement; "
+                << request.inputs.size() << "], numIns = " << request.num_ins
+                << ", outputs = [SpeakerArrangement; " << request.outputs.size()
+                << "], numOuts = " << request.num_outs << ")";
+    });
+}
+
 void Vst3Logger::log_request(bool is_host_vst,
                              const YaPluginFactory::Construct&) {
     log_request_base(is_host_vst,

src/common/logging/vst3.h

@@ -68,6 +68,7 @@ class Vst3Logger {
     void log_request(bool is_host_vst, const YaComponent::SetActive&);
     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 YaPluginFactory::Construct&);
     void log_request(bool is_host_vst, const YaPluginFactory::SetHostContext&);
     void log_request(bool is_host_vst, const WantsConfiguration&);

src/common/serialization/vst3.h

@@ -69,6 +69,7 @@ using ControlRequest = std::variant<YaComponent::Construct,
                                     YaComponent::SetActive,
                                     YaComponent::SetState,
                                     YaComponent::GetState,
+                                    YaComponent::SetBusArrangements,
                                     YaPluginFactory::Construct,
                                     YaPluginFactory::SetHostContext>;
 

src/common/serialization/vst3/base.h

@@ -39,6 +39,11 @@ using ArrayUID = std::array<
     std::remove_reference_t<decltype(std::declval<Steinberg::TUID>()[0])>,
     std::extent_v<Steinberg::TUID>>;
 
+/**
+ * The maximum number of speakers or busses we support.
+ */
+constexpr size_t max_num_speakers = 16384;
+
 /**
  * The maximum size for an `IBStream` we can serialize. Allows for up to 50 MB
  * of preset data. Hopefully no plugin will come anywhere near this limit, but

src/common/serialization/vst3/component.h

@@ -192,7 +192,7 @@ class YaComponent : public Steinberg::Vst::IComponent,
     tresult PLUGIN_API getControllerClassId(Steinberg::TUID classId) override;
 
     /**
-     * Message to pass through a call to `IComponent::setIoMode(IoMode)` to the
+     * Message to pass through a call to `IComponent::setIoMode(mode)` to the
      * Wine plugin host.
      */
     struct SetIoMode {
@@ -282,7 +282,7 @@ class YaComponent : public Steinberg::Vst::IComponent,
 
     /**
      * The response code and returned routing information for a call to
-     * `IComponent::getRoutingInfo(inInfo, outInfo <out>)`.
+     * `IComponent::getRoutingInfo(in_info, out_info <out>)`.
      */
     struct GetRoutingInfoResponse {
         UniversalTResult result;
@@ -298,8 +298,8 @@ class YaComponent : public Steinberg::Vst::IComponent,
     };
 
     /**
-     * Message to pass through a call to `IComponent::getRoutingInfo(inInfo,
-     * outInfo <out>)` to the Wine plugin host.
+     * Message to pass through a call to `IComponent::getRoutingInfo(in_info,
+     * out_info <out>)` to the Wine plugin host.
      */
     struct GetRoutingInfo {
         using Response = GetRoutingInfoResponse;
@@ -425,6 +425,33 @@ class YaComponent : public Steinberg::Vst::IComponent,
     getState(Steinberg::IBStream* state) override = 0;
 
     // From `IAudioProcessor`
+
+    /**
+     * Message to pass through a call to
+     * `IAudioProcessor::setBusArrangements(inputs, num_ins, outputs, num_outs)`
+     * to the Wine plugin host.
+     */
+    struct SetBusArrangements {
+        using Response = UniversalTResult;
+
+        native_size_t instance_id;
+
+        // These are orginally C-style heap arrays, not normal pointers
+        std::vector<Steinberg::Vst::SpeakerArrangement> inputs;
+        int32 num_ins;
+        std::vector<Steinberg::Vst::SpeakerArrangement> outputs;
+        int32 num_outs;
+
+        template <typename S>
+        void serialize(S& s) {
+            s.value8b(instance_id);
+            s.container8b(inputs, max_num_speakers);
+            s.value4b(num_ins);
+            s.container8b(outputs, max_num_speakers);
+            s.value4b(num_outs);
+        }
+    };
+
     virtual tresult PLUGIN_API
     setBusArrangements(Steinberg::Vst::SpeakerArrangement* inputs,
                        int32 numIns,