cannam@56: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
cannam@56: 
cannam@56: /*
cannam@56:     Vamp
cannam@56: 
cannam@56:     An API for audio analysis and feature extraction plugins.
cannam@56: 
cannam@56:     Centre for Digital Music, Queen Mary, University of London.
cannam@56:     Copyright 2006 Chris Cannam.
cannam@56:   
cannam@56:     Permission is hereby granted, free of charge, to any person
cannam@56:     obtaining a copy of this software and associated documentation
cannam@56:     files (the "Software"), to deal in the Software without
cannam@56:     restriction, including without limitation the rights to use, copy,
cannam@56:     modify, merge, publish, distribute, sublicense, and/or sell copies
cannam@56:     of the Software, and to permit persons to whom the Software is
cannam@56:     furnished to do so, subject to the following conditions:
cannam@56: 
cannam@56:     The above copyright notice and this permission notice shall be
cannam@56:     included in all copies or substantial portions of the Software.
cannam@56: 
cannam@56:     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@56:     EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@56:     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
cannam@56:     NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
cannam@56:     ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@56:     CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@56:     WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@56: 
cannam@56:     Except as contained in this notice, the names of the Centre for
cannam@56:     Digital Music; Queen Mary, University of London; and Chris Cannam
cannam@56:     shall not be used in advertising or otherwise to promote the sale,
cannam@56:     use or other dealings in this Software without prior written
cannam@56:     authorization.
cannam@56: */
cannam@56: 
cannam@56: #include "PluginLoader.h"
cannam@56: #include "PluginHostAdapter.h"
cannam@56: 
cannam@56: #include "system.h"
cannam@56: 
cannam@56: #include <dirent.h> // POSIX directory open and read
cannam@56: 
cannam@56: namespace Vamp {
cannam@56: 	
cannam@56: PluginLoader::PluginLoader()
cannam@56: {
cannam@56: }
cannam@56: 
cannam@56: PluginLoader::~PluginLoader()
cannam@56: {
cannam@56: }
cannam@56: 
cannam@56: std::vector<PluginLoader::PluginKey>
cannam@56: PluginLoader::listPlugins() 
cannam@56: {
cannam@56:     if (m_pluginLibraryMap.empty()) {
cannam@56: 
cannam@56:         std::vector<std::string> path = PluginHostAdapter::getPluginPath();
cannam@56: 
cannam@56:         size_t suffixLen = strlen(PLUGIN_SUFFIX);
cannam@56: 
cannam@56:         for (size_t i = 0; i < path.size(); ++i) {
cannam@56: 
cannam@56:             DIR *d = opendir(path[i].c_str());
cannam@56:             if (!d) {
cannam@56: //                perror("Failed to open directory");
cannam@56:                 continue;
cannam@56:             }
cannam@56:             
cannam@56:             struct dirent *e = 0;
cannam@56:             while ((e = readdir(d))) {
cannam@56: 
cannam@56:                 if (!(e->d_type & DT_REG) || !e->d_name) {
cannam@56:                     continue;
cannam@56:                 }
cannam@56: 
cannam@56:                 int len = strlen(e->d_name);
cannam@56:                 if (len < int(suffixLen + 2) ||
cannam@56:                     e->d_name[len - suffixLen - 1] != '.' ||
cannam@56:                     strcmp(e->d_name + len - suffixLen, PLUGIN_SUFFIX)) {
cannam@56:                     continue;
cannam@56:                 }
cannam@56: 
cannam@56:                 std::string basename = e->d_name;
cannam@56:                 basename = basename.substr(0, basename.length() - suffixLen - 1);
cannam@56:                 std::string fullPath = path[i].c_str();
cannam@56:                 fullPath = fullPath + "/" + e->d_name;
cannam@56:                 void *handle = DLOPEN(fullPath, RTLD_LAZY);
cannam@56: 
cannam@56:                 if (!handle) {
cannam@56:                     std::cerr << "Vamp::PluginLoader: " << e->d_name
cannam@56:                               << ": unable to load library (" << DLERROR()
cannam@56:                               << ")" << std::endl;
cannam@56:                     continue;
cannam@56:                 }
cannam@56:             
cannam@56:                 VampGetPluginDescriptorFunction fn =
cannam@56:                     (VampGetPluginDescriptorFunction)DLSYM
cannam@56:                     (handle, "vampGetPluginDescriptor");
cannam@56: 
cannam@56:                 if (!fn) {
cannam@56:                     DLCLOSE(handle);
cannam@56:                     continue;
cannam@56:                 }
cannam@56: 
cannam@56:                 int index = 0;
cannam@56:                 const VampPluginDescriptor *descriptor = 0;
cannam@56: 
cannam@56:                 while ((descriptor = fn(VAMP_API_VERSION, index))) {
cannam@56:                     PluginKey key = basename + ":" + descriptor->identifier;
cannam@56:                     if (m_pluginLibraryMap.find(key) ==
cannam@56:                         m_pluginLibraryMap.end()) {
cannam@56:                         m_pluginLibraryMap[key] = fullPath;
cannam@56:                     }
cannam@56:                     ++index;
cannam@56:                 }
cannam@56: 
cannam@56:                 DLCLOSE(handle);
cannam@56:             }
cannam@56: 
cannam@56:             closedir(d);
cannam@56:         }
cannam@56:     }
cannam@56: 
cannam@56:     std::vector<PluginKey> plugins;
cannam@56:     for (std::map<PluginKey, std::string>::iterator mi =
cannam@56:              m_pluginLibraryMap.begin();
cannam@56:          mi != m_pluginLibraryMap.end(); ++mi) {
cannam@56:         plugins.push_back(mi->first);
cannam@56:     }
cannam@56: 
cannam@56:     return plugins;
cannam@56: }
cannam@56: 
cannam@56: std::string
cannam@56: PluginLoader::getLibraryPath(PluginKey key)
cannam@56: {
cannam@56:     if (m_pluginLibraryMap.empty()) (void)listPlugins();
cannam@56:     if (m_pluginLibraryMap.find(key) == m_pluginLibraryMap.end()) return "";
cannam@56:     return m_pluginLibraryMap[key];
cannam@56: }    
cannam@56: 
cannam@56: Plugin *
cannam@56: PluginLoader::load(PluginKey key, float inputSampleRate)
cannam@56: {
cannam@56:     std::string fullPath = getLibraryPath(key);
cannam@56:     if (fullPath == "") return 0;
cannam@56:     
cannam@56:     std::string::size_type ki = key.find(':');
cannam@56:     if (ki == std::string::npos) {
cannam@56:         //!!! flag error
cannam@56:         return 0;
cannam@56:     }
cannam@56: 
cannam@56:     std::string identifier = key.substr(ki + 1);
cannam@56:     
cannam@56:     void *handle = DLOPEN(fullPath, RTLD_LAZY);
cannam@56: 
cannam@56:     if (!handle) {
cannam@56:         std::cerr << "Vamp::PluginLoader: " << fullPath
cannam@56:                   << ": unable to load library (" << DLERROR()
cannam@56:                   << ")" << std::endl;
cannam@56:         return 0;
cannam@56:     }
cannam@56:     
cannam@56:     VampGetPluginDescriptorFunction fn =
cannam@56:         (VampGetPluginDescriptorFunction)DLSYM
cannam@56:         (handle, "vampGetPluginDescriptor");
cannam@56: 
cannam@56:     if (!fn) {
cannam@56:         //!!! refcount this! --!!! no, POSIX says dlopen/dlclose will
cannam@56:         // reference count. check on win32
cannam@56:         DLCLOSE(handle);
cannam@56:         return 0;
cannam@56:     }
cannam@56: 
cannam@56:     int index = 0;
cannam@56:     const VampPluginDescriptor *descriptor = 0;
cannam@56: 
cannam@56:     while ((descriptor = fn(VAMP_API_VERSION, index))) {
cannam@56:         if (std::string(descriptor->identifier) == identifier) {
cannam@56:             return new Vamp::PluginHostAdapter(descriptor, inputSampleRate);
cannam@56:         }
cannam@56:         ++index;
cannam@56:     }
cannam@56:     
cannam@56:     //!!! flag error
cannam@56:     return 0;
cannam@56: }
cannam@56: 
cannam@56: }
cannam@56: