The "gst_rtp_get_header_extension_list" function returns "GstElementFactory" elements instead of "GstRTPHeaderExtension" elements.

The documentation for gst_rtp_get_header_extension_list states that it returns a GList of GstRTPHeaderExtension objects. https://gstreamer.freedesktop.org/documentation/rtplib/gstrtpbasepayload.html?gi-language=c

However, I've found that it actually returns a GList of GstElementFactory objects. If you then use gst_element_factory_create on each of those factories, you get the GstRTPHeaderExtension objects.

Here is some test code that illustrates this:

#include <gst/gst.h>
#include <gst/gstinfo.h>
#include <gst/rtp/rtp.h>

int main() {
    gst_init(NULL, NULL);

    GList* header_extension_list = gst_rtp_get_header_extension_list();

    g_print("Available RTP Header Extensions:\n");

    for (GList* l = header_extension_list; l != NULL; l = l->next) {
        GstElement* test_element = gst_element_factory_create(GST_ELEMENT_FACTORY_CAST(l->data), "testing");
        g_print("\t%s\t%s\n", G_OBJECT_TYPE_NAME(test_element), gst_rtp_header_extension_get_uri(GST_RTP_HEADER_EXTENSION_CAST(test_element)));

        g_object_unref(test_element);
    }

    gst_plugin_feature_list_free(header_extension_list);
}