fazekasgy@0: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
fazekasgy@0: 
fazekasgy@0: /**
cannam@7:  * This Vamp plugin is a wrapper for Python Scripts. (VamPy)
fazekasgy@0:  * Centre for Digital Music, Queen Mary, University of London.
fazekasgy@0:  * Copyright 2008, George Fazekas.
cannam@24:  */
fazekasgy@0: 
cannam@3: #include <Python.h>
fazekasgy@0: #include "vamp/vamp.h"
fazekasgy@0: #include "vamp-sdk/PluginAdapter.h"
fazekasgy@0: #include "PyPlugScanner.h"
fazekasgy@0: #include "PyPlugin.h"
fazekasgy@0: 
fazekasgy@0: #ifdef _WIN32
fazekasgy@0: #define pathsep ('\\')
fazekasgy@0: #include <windows.h>
fazekasgy@0: #include <tchar.h>
fazekasgy@0: #else 
fazekasgy@0: #define pathsep ('/')
fazekasgy@0: #include <dirent.h>
fazekasgy@0: #include <dlfcn.h>
fazekasgy@0: #endif
fazekasgy@0: 
fazekasgy@0: using std::cerr;
fazekasgy@0: using std::endl;
fazekasgy@0: using std::string;
fazekasgy@0: using std::vector;
fazekasgy@0: 
fazekasgy@6: //volatile bool mutex = false;
fazekasgy@0: static int adinstcount;
fazekasgy@0: 
fazekasgy@0: class PyPluginAdapter : public Vamp::PluginAdapterBase
fazekasgy@0: {
fazekasgy@0: public: 
cannam@24:     PyPluginAdapter(std::string pyPlugId, PyObject* pyClass) :
cannam@24:         PluginAdapterBase(),
cannam@24:         m_plug(pyPlugId),		
cannam@24:         m_pyClass(pyClass)
cannam@24:     { 
cannam@24:         cerr << "PyPluginAdapter:ctor:"<< adinstcount << ": " << m_plug << endl; 
cannam@24:         adinstcount++;
cannam@24:         m_instanceCount = 0;
cannam@24:     }
cannam@24:     
cannam@24:     ~PyPluginAdapter() 
cannam@24:     {
cannam@24:     }
cannam@24:     
fazekasgy@0: protected:
cannam@24:     Vamp::Plugin *createPlugin(float inputSampleRate)
cannam@24:     {
cannam@24:         try {
cannam@24:             PyPlugin *plugin = new PyPlugin(m_plug, inputSampleRate, m_pyClass);
cannam@24:             m_instanceCount++;
cannam@24:             return plugin;
cannam@24:         } catch (...) {
cannam@24:             cerr << "PyPluginAdapter::createPlugin: Failed to construct PyPlugin" << endl;
cannam@24:             return 0;
cannam@24:         }
cannam@24:     }
cannam@24:     
cannam@24:     std::string m_plug;
cannam@24:     bool m_haveInitialized;
cannam@24:     PyObject *m_pyClass;
cannam@24:     int m_instanceCount;
fazekasgy@0: };
fazekasgy@0: 
fazekasgy@0: 
fazekasgy@0: static std::vector<PyPluginAdapter *> adapters;
fazekasgy@0: static bool haveScannedPlugins = false;
fazekasgy@0: 
cannam@16: static bool tryPreload(string name)
cannam@16: {
cannam@29: //    cerr << "Trying to load Python interpreter library \"" << name << "\"...";
cannam@19: #ifdef _WIN32
cannam@19:     void *lib = LoadLibrary(name.c_str());
cannam@19:     if (!lib) {
cannam@29: //        cerr << " failed" << endl;
cannam@19:         return false;
cannam@19:     }
cannam@19: #else
cannam@16:     void *lib = dlopen(name.c_str(), RTLD_NOW | RTLD_GLOBAL);
cannam@16:     if (!lib) {
cannam@29: //        cerr << " failed" << endl;
cannam@16:         return false;
cannam@16:     }
cannam@19: #endif
cannam@29: //    cerr << " succeeded" << endl;
cannam@16:     return true;
cannam@16: }
cannam@16: 
cannam@16: static bool preloadPython()
cannam@16: {
cannam@20: #ifdef _WIN32
cannam@20:     // this doesn't seem to be necessary at all on Windows
cannam@20:     return true;
cannam@20: #endif
cannam@16: 
cannam@16:     string pyver = Py_GetVersion();
cannam@16:     int dots = 2;
cannam@16:     string shortver;
cannam@18:     for (size_t i = 0; i < pyver.length(); ++i) {
cannam@16:         if (pyver[i] == '.') {
cannam@16:             if (--dots == 0) {
cannam@16:                 shortver = pyver.substr(0, i);
cannam@16:                 break;
cannam@16:             }
cannam@16:         }
cannam@16:     }
cannam@16:     cerr << "Short version: " << shortver << endl;
cannam@16: 
cannam@16:     vector<string> pfxs;
cannam@16:     pfxs.push_back("");
cannam@16:     pfxs.push_back(string(Py_GetExecPrefix()) + "/lib/");
cannam@16:     pfxs.push_back(string(Py_GetExecPrefix()) + "/");
cannam@16:     pfxs.push_back("/usr/lib/");
cannam@16:     pfxs.push_back("/usr/local/lib/");
cannam@16:     char buffer[5];
cannam@16: 
cannam@16:     // hahaha! grossness is like a brother to us
cannam@17: #ifdef __APPLE__
cannam@18:     for (size_t pfxidx = 0; pfxidx < pfxs.size(); ++pfxidx) {
cannam@17:         for (int minor = 8; minor >= 0; --minor) {
cannam@17:             sprintf(buffer, "%d", minor);
cannam@17:             if (tryPreload(pfxs[pfxidx] + string("libpython") + shortver + ".dylib." + buffer)) return true;
cannam@17:         }
cannam@17:         if (tryPreload(pfxs[pfxidx] + string("libpython") + shortver + ".dylib")) return true;
cannam@17:         if (tryPreload(pfxs[pfxidx] + string("libpython.dylib"))) return true;
cannam@17:     }
cannam@17: #else
cannam@18:     for (size_t pfxidx = 0; pfxidx < pfxs.size(); ++pfxidx) {
cannam@16:         for (int minor = 8; minor >= 0; --minor) {
cannam@16:             sprintf(buffer, "%d", minor);
cannam@16:             if (tryPreload(pfxs[pfxidx] + string("libpython") + shortver + ".so." + buffer)) return true;
cannam@16:         }
cannam@16:         if (tryPreload(pfxs[pfxidx] + string("libpython") + shortver + ".so")) return true;
cannam@16:         if (tryPreload(pfxs[pfxidx] + string("libpython.so"))) return true;
cannam@16:     }
cannam@17: #endif
cannam@16:         
cannam@16:     return false;
cannam@16: }
fazekasgy@25: 
fazekasgy@25: /* This doesn't work: don't try it again.
fazekasgy@25: static bool initPython()
fazekasgy@25: {
fazekasgy@25: 	// preloadPython();
fazekasgy@25: 	Py_Initialize();
fazekasgy@25: #ifndef _WIN32
fazekasgy@25: 	//set dlopen flags form Python 
fazekasgy@25: 	string pyCmd = "from sys import setdlopenflags\nimport dl\nsetdlopenflags(dl.RTLD_NOW|dl.RTLD_GLOBAL)\n";
fazekasgy@25: 	if (PyRun_SimpleString(pyCmd.c_str()) == -1) 
fazekasgy@25: 	{   
fazekasgy@25: 	    cerr << "Warning: Could not set dlopen flasgs. Dynamic loading in scripts will fail." << endl;
fazekasgy@25: 		return false;
fazekasgy@25: 	}
fazekasgy@25: #endif	
fazekasgy@25: 	PyEval_InitThreads();			
fazekasgy@25: 	return Py_IsInitialized();
fazekasgy@25: }    
fazekasgy@25: */
cannam@16: 
fazekasgy@0: const VampPluginDescriptor 
fazekasgy@0: *vampGetPluginDescriptor(unsigned int version,unsigned int index)
fazekasgy@0: {	
fazekasgy@0:     if (version < 1) return 0;
fazekasgy@0: 
fazekasgy@0: 	int isPythonInitialized = Py_IsInitialized();
cannam@24: 	cerr << "# isPythonInitialized: " << isPythonInitialized << endl;
cannam@24: 	cerr << "# haveScannedPlugins: " << haveScannedPlugins << endl;
fazekasgy@0: 
fazekasgy@0: 	if (!haveScannedPlugins) {
fazekasgy@8: 
fazekasgy@25: 		if (!isPythonInitialized){
fazekasgy@0: 
fazekasgy@25: 			if (!preloadPython())
fazekasgy@25: 				cerr << "Warning: Could not preload Python. Dynamic loading in scripts will fail." << endl;
fazekasgy@25: 			Py_Initialize();
fazekasgy@25: 		    cerr << "# isPythonInitialized after initialize: " << Py_IsInitialized() << endl;
fazekasgy@25: 			// PyEval_InitThreads(); //not sure why this was needed
fazekasgy@25: 		}
cannam@16: 
fazekasgy@0: 		vector<string> pyPlugs;
fazekasgy@0: 		vector<string> pyPath;
cannam@24: 		vector<PyObject *> pyClasses;
fazekasgy@0: 		static PyPlugScanner *scanner;
fazekasgy@0: 		
fazekasgy@0: 		//Scanning Plugins
fazekasgy@0: 		cerr << "Scanning PyPlugins" << endl;
fazekasgy@0: 		scanner = PyPlugScanner::getInstance();
fazekasgy@0: 		pyPath=scanner->getAllValidPath();
fazekasgy@0: 		//add this as extra path for development
fazekasgy@6: 		//pyPath.push_back("/Users/Shared/Development/vamp-experiments");
fazekasgy@0: 		scanner->setPath(pyPath);
fazekasgy@0: 		pyPlugs = scanner->getPyPlugs();
fazekasgy@0: 		cerr << "Found " << pyPlugs.size() << " Scripts ...OK" << endl;
fazekasgy@0: 		//TODO: this will support multiple classes per script
cannam@24: 		pyClasses = scanner->getPyClasses();
cannam@24: 		cerr << "Found " << pyClasses.size() << " Classes ...OK" << endl;
fazekasgy@0: 
fazekasgy@0: 		for (size_t i = 0; i < pyPlugs.size(); ++i) {
cannam@24: 			adapters.push_back( new PyPluginAdapter(pyPlugs[i],pyClasses[i]));
fazekasgy@0: 		} 
fazekasgy@0: 		haveScannedPlugins=true;		
fazekasgy@6: 		
fazekasgy@0: 	}
fazekasgy@0: 
fazekasgy@0: 	cerr << "Accessing adapter index: " << index << " (adapters: " << adapters.size() << ")" << endl;
fazekasgy@0: 	if (index<adapters.size()) {
fazekasgy@0: 		const VampPluginDescriptor *tmp = adapters[index]->getDescriptor();
fazekasgy@0: 		return tmp;
fazekasgy@0: 	} else return 0;
fazekasgy@0: 
fazekasgy@0: 	
fazekasgy@0: }
fazekasgy@0: 
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