audio_renderer/src/core/PluginIndex.h

/*
 * PluginHost.h
 *
 *  Created on: 17 déc. 2023
 *      Author: fanch
 */

#ifndef SRC_CORE_PLUGININDEX_H_
#define SRC_CORE_PLUGININDEX_H_

#include <ladspa.h>
#include <string>
#include <vector>
#include <utility>
#include <cstdio>
#include <dlfcn.h>

struct DllEntry {
	std::string path;
	int count;
	void* ptr;
};
typedef std::vector<DllEntry> DllTable;

class DllManager;
class DllManager {


public:
	DllManager(){

	}

	virtual ~DllManager(){

	}

	void* _open(const std::string& path){
		for(size_t i=0; i<m_table.size(); i++){
			if(m_table[i].path == path){
				m_table[i].count++;
				return m_table[i].ptr;
			}
		}
		DllEntry entry;
		entry.path = path;
		entry.count = 1;
		entry.ptr =  dlopen(path.c_str(), RTLD_LAZY);
		m_table.push_back(entry);
		return entry.ptr;
	}

	void _close(void* ptr){

		for(size_t i=0; i<m_table.size(); i++){
			if(m_table[i].ptr == ptr){
				m_table[i].count--;
				if(m_table[i].count<=0){
					printf("Close %s\n", m_table[i].path.c_str());
					dlclose(m_table[i].ptr);
					m_table.erase(m_table.begin()+i);
				}
				return;
			}
		}
	}

	static void* open(const std::string& path){
		return DllManager::m_instance->_open(path);
	}

	static void close(void* ptr){
		return DllManager::m_instance->_close(ptr);
	}


protected:
	DllTable m_table;

	static DllManager* m_instance;
};



struct PluginPort {

	PluginPort() : index(0), is_input(false), is_output(false),
			is_audio(false), is_control(false){
	}

	virtual ~PluginPort(){
	}

	std::string name;
	int index;
	bool is_input;
	bool is_output;
	bool is_audio;
	bool is_control;


	std::string& to_string(std::string& out) const {
		out += "[" + name +"] ";
		if(is_input) out+="AUDIO ";
		if(is_output) out+="OUTPUT ";
		if(is_audio) out+="AUDIO ";
		if(is_control) out+="CONTROL ";
		out+="\n";
		return out;
	}
};

typedef std::vector<PluginPort> PluginPorts;

class PluginEntry {
public:
	PluginEntry(const std::string& plugin_path){
		set_path(plugin_path);
	}

	PluginEntry(){
		_clear();
	}

	PluginEntry(const PluginEntry& other){
		m_loaded = other.m_loaded;
		m_name = other.m_name;
		m_path = other.m_path;
		m_error = other.m_error;
		m_is_error = other.m_is_error;
		m_label = other.m_label;
		m_id = other.m_id;
		m_ports = other.m_ports;
	}

	virtual ~PluginEntry(){

	}

	void set_path(const std::string& path){
		if(path == m_path) return;
		m_loaded = false;
		this->m_path = path;
	}

	void load();

	const std::string& path() const{
		return m_path;
	}

	std::string& to_string(std::string& out) const {
		char tmp[1024];
		sprintf(tmp, "=== [%s] %s%s===\n  id=%d\n  name=%s\n  label=%s\n  ports:\n",
				m_path.c_str(),
				(m_is_error?"Erreur: ":""),
				(m_is_error?m_error.c_str():""),
				m_id, m_name.c_str(), m_label.c_str());

		out+=tmp;
		for(size_t i=0; i<m_ports.size(); i++){
			out+="    ";
			m_ports[i].to_string(out);
		}
		return out;
	}

	void print() const {
		std::string out;
		to_string(out);
		printf("%s\n", out.c_str());
	}

	const PluginPorts& ports() const {
		return m_ports;
	}

protected:

	void _clear(){
		m_loaded = false;
	}

	void _read_info(){
		m_loaded = true;
	}

	bool m_loaded;
	std::string m_path;
	std::string m_name;
	std::string m_error;
	bool m_is_error;
	std::string m_label;
	long m_id;
	PluginPorts m_ports;


	friend class PluginInstance;

};

class PluginIndex {
public:
	PluginIndex(){

	}

	virtual ~PluginIndex(){

	}

	void add_path(const std::string& path){
		m_plugin_pathes.push_back(path);
	}

	void list() const;

	void update();

	PluginEntry& load_from_path(const std::string& path);



	void print() const{
		printf("%d plugins\n", m_plugins.size());
		for(size_t i=0; i<m_plugins.size(); i++){
			printf("Plugin '%s'\n", m_plugins[i].path().c_str());
		}
	}


protected:
	void _update_dir(const std::string& dir);

	std::vector<std::string> m_plugin_pathes;
	std::vector<PluginEntry> m_plugins;

};

#endif /* SRC_CORE_PLUGININDEX_H_ */