<div dir="ltr"><div dir="ltr" class="gmail_msg">I noticed this warning fly by: gst-libs/gst/vanc/Makefile.am:17: warning: variable 'libgstvanc_@GST_API_VERSION@la_SOURCES' is defined but no program or gst-libs/gst/vanc/Makefile.am:17: library has 'libgstvanc_@GST_API_VERSION@la' as canonical name (possible typo) </div><div class="gmail_msg">How does it know that? Could that be part of my problem? </div><div class="gmail_msg">John </div> <div class="gmail_quote gmail_msg"><div dir="ltr" class="gmail_msg">On Mon, Oct 10, 2016 at 4:46 PM John P Poet <<a href="mailto:jppoet@gmail.com" class="gmail_msg" target="_blank">jppoet@gmail.com</a>> wrote: </div><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="gmail_msg"><div dir="ltr" class="gmail_msg"><div class="gmail_msg"><div class="gmail_msg"><div class="gmail_msg"><div class="gmail_msg"><div class="gmail_msg"><div class="gmail_msg"><div class="gmail_msg">I am writing a new meta lib, and have been battling trying to solve: ``` $ gst-inspect-1.0 decklinkvideosrc (gst-plugin-scanner:10063): GStreamer-WARNING **: Failed to load plugin '/opt/gst/lib/gstreamer-1.0/libgstdecklink.so': /opt/gst/lib/gstreamer-1.0/libgstdecklink.so: undefined symbol: vanc_meta_get_info ``` </div>What is interesting about this, is that the exact same library/header/c file defines: ``` VANCMeta * gst_buffer_add_vanc_meta (GstBuffer * buffer, gint did, gint dbn_sdid, uint16_t * data, gsize size, uint16_t checksum); ``` </div>And that function links/runs prefectly when used in decklinkvideosrc. It is only when adding a call to ``` const GstMetaInfo *vanc_meta_get_info (void); ``` </div>That I get that undefined symbol error. I have been beating my head against this for a couple of days, so I hope a fresh pair of eyes will spot what I am doing wrong. </div>The relevant parts are: </div>gstvancmeta.h ``` #ifndef _GST_VANC_META_H_ #define _GST_VANC_META_H_ #ifdef __cplusplus extern "C" { #endif #include <gst/gst.h> #include <stdint.h> ... /* implementation */ const GstMetaInfo *vanc_meta_get_info (void); #define GST_VANC_META_INFO (vanc_meta_get_info ()) VANCMeta * gst_buffer_add_vanc_meta (GstBuffer * buffer, gint did, gint dbn_sdid, uint16_t * data, gsize size, uint16_t checksum); ... ``` </div>gstvancmeta.c ``` #include "gstvancmeta.h" ... const GstMetaInfo *vanc_meta_get_info (void) { static const GstMetaInfo *meta_info = NULL; if (g_once_init_enter (&meta_info)) { const GstMetaInfo *mi = gst_meta_register (VANC_META_API_TYPE, "VANCMeta", sizeof (VANCMeta), vanc_meta_init, vanc_meta_free, vanc_meta_transform); g_once_init_leave (&meta_info, mi); } return meta_info; } VANCMeta * gst_buffer_add_vanc_meta (GstBuffer * buffer, gint did, gint dbn_sdid, uint16_t * data, gsize size, uint16_t checksum) { VANCMeta *vmeta; g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL); vmeta = (VANCMeta *) gst_buffer_add_meta (buffer, GST_VANC_META_INFO, NULL); ... return vmeta; } ``` </div>And then I call them from code in gstdecklinkvideosrc.cpp, for example: ``` static void packetizeComponentAncillary(GstDecklinkVideoSrc *self, std::vector<uint16_t> &data, GstBuffer * buffer) { const GstMetaInfo *vanc_info = vanc_meta_get_info (); ... if (usableVANC(did, dbn_sdid)) { gst_buffer_add_vanc_meta (buffer, did, dbn_sdid, &data[idx + 6], data_count, chksum_e); GST_WARNING_OBJECT (self, "VANC meta added"); } } } ``` <div class="gmail_msg"> </div><div class="gmail_msg">I only add the call to vanc_meta_get_info () there just to see if it would link, since it does not in gst-libav. It does not either place. In gstdecklink it is linking the .la file, and in gst-libav it is linking the .so file. </div><div class="gmail_msg">I will attach the full patch in case it helps. </div><div class="gmail_msg">Thank you, </div><div class="gmail_msg">John </div></div></div></blockquote></div></div>