"Linking" to dynamically loaded plugins.

[benoitlahoz]

Hello, 

I'm building an umbrella framework on OSX (XCode) including GStreamer. 
Everything works fine except for the plugins that doesn't have a dylib.

I add /-undefined dynamic_lookup/ to the Other Linker Flags in order to
avoid errors at build time. 
Then, for instance, when I instantiate a gstdecklinksrc plugin it works
fine, but when I try to use its own specific functions in my code, the
runtime tells me that library was not loaded.

I'm wondering how GStreamer loads its plugins and how I can use the
functions of these plugins that don't have a shared library. 

For information, before GStreamer initialization I run this method: 

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{

        /**
         * Get paths for GStreamer framework.
         */
        
        NSString *frameworksPath = [[NSBundle mainBundle]
privateFrameworksPath];
        
        NSString *scannerPath = [NSString stringWithFormat:@"%@/%@",
                                 frameworksPath,
                                
@"PiplStream.Framework/Versions/A/Frameworks/GStreamer.framework/Versions/0.3/libexec/gstreamer-1.0/gst-plugin-scanner"];
        
        NSString *pluginsPath = [NSString stringWithFormat:@"%@/%@",
                                 frameworksPath,
                                
@"PiplStream.Framework/Versions/A/Frameworks/GStreamer.framework/Versions/0.3/lib/gstreamer-1.0/"];
        
        NSString *gtkPath = [NSString stringWithFormat:@"%@/%@",
                             frameworksPath,
                            
@"PiplStream.Framework/Versions/A/Frameworks/GStreamer.framework/Versions/0.3/"];
        
        NSString *gioPath = [NSString stringWithFormat:@"%@/%@",
                             frameworksPath,
                            
@"PiplStream.Framework/Versions/A/Frameworks/GStreamer.framework/Versions/0.3/lib/gio/modules/"];
        
        NSString *gdkDirPath = [NSString stringWithFormat:@"%@/%@",
                                frameworksPath,
                               
@"PiplStream.Framework/Versions/A/Frameworks/GStreamer.framework/Versions/0.3/lib/gdk-pixbuf-2.0/2.10.0/loaders/"];
        
        NSString *gdkModPath = [NSString stringWithFormat:@"%@/%@",
                                frameworksPath,
                               
@"PiplStream.Framework/Versions/A/Frameworks/GStreamer.framework/Versions/0.3/lib/gdk-pixbuf-2.0/2.10.0/loaders.cache"];
        
        /**
         * Load libraries at this path if a compatible version is not found
on system.
         */
        
        NSString *priorityPath = [NSString stringWithFormat:@"%@/%@",
                                  frameworksPath,
                                 
@"PiplStream.Framework/Versions/A/Frameworks/GStreamer.framework/Versions/0.3/lib/"];
        
        setenv("DYLD_FALLBACK_LIBRARY_PATH", [priorityPath UTF8String], 1);
        
        /**
         * Setup environment variables for GStreamer.
         */
        
        setenv("GST_PLUGIN_SCANNER", [scannerPath UTF8String], 1);
        setenv("GST_PLUGIN_PATH", [pluginsPath UTF8String], 1);
        setenv("GTK_PATH", [gtkPath UTF8String], 1);
        setenv("GIO_EXTRA_MODULES", [gioPath UTF8String], 1);
        setenv("GDK_PIXBUF_MODULEDIR", [gdkDirPath UTF8String], 1);
        setenv("GDK_PIXBUF_MODULE_FILE", [gdkModPath UTF8String], 1);
        
        // Initialize GStreamer
        gst_init(NULL, NULL);
        
    });

Thank you!

Ben




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