comparison src/vamp-hostsdk/host-c.cpp @ 390:06988ce35ff0 vh

Initial draft of C API for plugin loading

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Vamp
+
+    An API for audio analysis and feature extraction plugins.
+
+    Centre for Digital Music, Queen Mary, University of London.
+    Copyright 2006-2015 Chris Cannam and QMUL.
+  
+    Permission is hereby granted, free of charge, to any person
+    obtaining a copy of this software and associated documentation
+    files (the "Software"), to deal in the Software without
+    restriction, including without limitation the rights to use, copy,
+    modify, merge, publish, distribute, sublicense, and/or sell copies
+    of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be
+    included in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
+    ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+    CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+    Except as contained in this notice, the names of the Centre for
+    Digital Music; Queen Mary, University of London; and Chris Cannam
+    shall not be used in advertising or otherwise to promote the sale,
+    use or other dealings in this Software without prior written
+    authorization.
+*/
+
+#include <vamp-hostsdk/host-c.h>
+
+#include "Files.h"
+
+#include <map>
+#include <iostream>
+
+#include <cstring>
+
+using namespace std;
+
+static vector<string> files;
+static map<string, const char *> cnames;
+static bool haveFiles = false;
+
+struct vhLibrary_t {
+    vhLibrary_t(void *h, VampGetPluginDescriptorFunction f)
+        : handle(h), func(f), nplugins(0) { } 
+    void *handle;
+    VampGetPluginDescriptorFunction func;
+    int nplugins;
+};
+
+static void initFilenames()
+{
+    if (!haveFiles) {
+        files = Files::listLibraryFiles();
+        for (size_t i = 0; i < files.size(); ++i) {
+            cnames[files[i]] = strdup(Files::lcBasename(files[i]).c_str());
+        }
+        haveFiles = true;
+    }
+}
+
+int vhGetLibraryCount()
+{
+    initFilenames();
+    return int(files.size());
+}
+
+const char *vhGetLibraryName(int library)
+{
+    initFilenames();
+    if (library < int(files.size())) {
+        return cnames[files[library]];
+    }
+    else return 0;
+}
+
+vhLibrary vhLoadLibrary(const char *libraryName)
+{
+    for (size_t i = 0; i < files.size(); ++i) {
+
+        if (Files::lcBasename(libraryName) == Files::lcBasename(files[i])) {
+
+            string fullPath = files[i];
+            void *lib = Files::loadLibrary(fullPath);
+
+            if (!lib) return 0;
+            
+            VampGetPluginDescriptorFunction func =
+                (VampGetPluginDescriptorFunction)Files::lookupInLibrary
+                (lib, "vampGetPluginDescriptor");
+            if (!func) {
+                cerr << "vhLoadLibrary: No vampGetPluginDescriptor function found in library \""
+                     << fullPath << "\"" << endl;
+                Files::unloadLibrary(lib);
+                return 0;
+            }
+
+            vhLibrary_t *vhl = new vhLibrary_t(lib, func);
+            while (vhl->func(VAMP_API_VERSION, vhl->nplugins)) {
+                ++vhl->nplugins;
+            }
+            return vhl;
+        }
+    }
+
+    return 0;
+}
+
+int vhGetPluginCount(vhLibrary library)
+{
+    vhLibrary_t *vhl = static_cast<vhLibrary_t *>(library);
+    if (vhl) return vhl->nplugins;
+    else return 0;
+}
+
+const VampPluginDescriptor *vhGetPluginDescriptor(vhLibrary library,
+                                                  int plugin)
+{
+    vhLibrary_t *vhl = static_cast<vhLibrary_t *>(library);
+    if (vhl && plugin >= 0 && plugin < vhl->nplugins) {
+        return vhl->func(VAMP_API_VERSION, plugin);
+    } else {
+        return 0;
+    }
+}
+
+void vhUnloadLibrary(vhLibrary library)
+{
+    vhLibrary_t *vhl = static_cast<vhLibrary_t *>(library);
+    if (vhl && vhl->handle) {
+        Files::unloadLibrary(vhl->handle);
+    }
+    delete vhl;
+}
+