新增host_param

core/audio/plugin_host/host_param.cpp

@@ -0,0 +1,26 @@
+//
+// Created by Nanako on 24-5-30.
+//
+
+#include "host_param.h"
+
+#include "plugin_host.h"
+
+host_param::host_param(plugin_host* host, int32_t index) : host_(host), index_(index)
+{
+	is_valid_= host->is_param_index_valid(index_);
+}
+
+void host_param::set_value(float in_value)
+{
+	if (!is_valid())
+		return;
+	host_->set_param_value(index_, in_value);
+}
+
+float host_param::get_value() const
+{
+	if (!is_valid())
+		return 0;
+	return host_->get_param_value(index_);
+}

core/audio/plugin_host/host_param.h

@@ -0,0 +1,25 @@
+#pragma once
+#include "extern.h"
+#include <string>
+
+class plugin_host;
+
+class CORE_API host_param
+{
+public:
+	host_param(plugin_host* host, int32_t index);
+	[[nodiscard]] int32_t get_index() const { return index_; }
+	[[nodiscard]] const std::string& get_name() const { return name_; }
+	[[nodiscard]] bool is_valid() const { return is_valid_; }
+	void set_value(float in_value);
+	[[nodiscard]] float get_value() const;
+
+	explicit operator bool() const {
+		return is_valid();
+	}
+private:
+	int32_t index_ = -1;
+	std::string name_;
+	plugin_host* host_;
+	bool is_valid_ = false;
+};

core/audio/plugin_host/plugin_host.h

@@ -3,6 +3,7 @@
 #include <string>
 #include <vector>
 #include "extern.h"
+#include "host_param.h"
 #include "audio/misc/circular_audio_buffer.h"
 #include "misc/delegates.h"
 
@@ -38,7 +39,11 @@ public:
     [[nodiscard]] virtual std::string load_name() const { return ""; }
     [[nodiscard]] virtual std::string load_vendor() const { return ""; }
 
-    virtual std::string get_parameter_name(int index) const { return ""; }
+    [[nodiscard]] virtual std::string get_parameter_name(int index) const = 0;
+    [[nodiscard]] virtual int32_t get_param_count() const = 0;
+    [[nodiscard]] virtual bool is_param_index_valid(const int32_t index) const { return index >= 0 && index < get_param_count(); }
+    virtual void set_param_value(int32_t index, float value) = 0;
+    virtual float get_param_value(int32_t index) = 0;
 
     void init_channel_interface();
 
@@ -48,6 +53,7 @@ public:
     std::vector<mixer_track*> owner_tracks;
     bool editor_opened = false;
     std::shared_ptr<circular_buffer_vector_type> ui_buffers;
+    multicast_delegate<void(int32_t index, float value)> on_param_changed;
 protected:
     void create_and_open_editor();
     void destroy_editor();

core/audio/plugin_host/vst2/vst2_plugin_host.cpp

@@ -278,7 +278,27 @@ VstIntPtr vst2_plugin_host::dispatch(VstInt32 opcode, VstInt32 index, VstIntPtr
 }
 
 std::string vst2_plugin_host::get_parameter_name(int index) const {
-    char buffer[256];
-    dispatch(effGetParamName, index, 0, buffer);
+    char buffer[kVstMaxParamStrLen];
+    dispatch(effGetParamDisplay, index, 0, buffer);
     return buffer;
 }
+
+int32_t vst2_plugin_host::get_param_count() const
+{
+    if (!effect_)
+        return 0;
+    return effect_->numParams;
+}
+
+void vst2_plugin_host::set_param_value(int32_t index, float value)
+{
+    if (effect_)
+        effect_->setParameter(effect_, index, value);
+}
+
+float vst2_plugin_host::get_param_value(int32_t index)
+{
+    if (!effect_)
+        return 0;
+    return effect_->getParameter(effect_, index);
+}

core/audio/plugin_host/vst2/vst2_plugin_host.h

@@ -26,7 +26,10 @@ public:
     [[nodiscard]] bool has_editor() const override;
     void get_editor_size(uint32_t& width, uint32_t& height) const override;
     // [[nodiscard]] ImVec2 get_editor_size() const override;
-    std::string get_parameter_name(int index) const override;
+    [[nodiscard]] std::string get_parameter_name(int index) const override;
+    [[nodiscard]] int32_t get_param_count() const override;
+    void set_param_value(int32_t index, float value) override;
+    float get_param_value(int32_t index) override;
 
     [[nodiscard]] std::string load_name() const override;
     [[nodiscard]] std::string load_vendor() const override;