1 files changed, 121 insertions, 0 deletions
diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..6511a52
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,121 @@
+/*
+ *  sydra
+ *
+ *  sydra is a toolbox which allows you to set up multiple bidirectional
+ *  Video/Audio streams from external locations.
+ *  sydra has been written to be used for the Elevate Festival in Graz
+ *  Austria in order to involve external locations to present themselves
+ *  at the festival.
+ *  Sydra is based on GStreamer and is written in C.
+ *
+ *
+ *  Copyright (C) 2014 Christian Pointner <equinox@spreadspace.org>
+ *
+ *  This file is part of sydra.
+ *
+ *  sydra is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  any later version.
+ *
+ *  sydra is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with sydra. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  In addition, as a special exception, the copyright holders hereby
+ *  grant permission for non-GPL-compatible GStreamer plugins to be used
+ *  and distributed together with GStreamer and sydra.
+ *  This permission goes above and beyond the permissions granted by the
+ *  GPL license sydra is covered by.
+ */
+
+#include "utils.h"
+#include "log.h"
+#include <gst/gst.h>
+
+GstElement* sydra_create_bin_from_desc(const char* type, const char* desc)
+{
+  GError *error = NULL;
+  GstElement *bin =  gst_parse_bin_from_description(desc, TRUE, &error);
+  if(!bin) {
+    log_printf(ERROR, "Bin description for %s parser error: %s", type, error ? error->message : "unknown");
+    g_error_free(error);
+    return NULL;
+  }
+  if(error) {
+    log_printf(WARNING, "Bin description for %s parser warning: %s", type, error ? error->message : "unknown");
+    g_error_free(error);
+  }
+  return bin;
+}
+
+GstElement* sydra_create_element(const char* type, const char* name)
+{
+  GstElement *e = gst_element_factory_make (type, name);
+  if(!e) {
+    log_printf(ERROR, "Error creating element %s%sof type %s", name ? name : "", name ? " " : "", type);
+    return NULL;
+  }
+  return e;
+}
+
+static gboolean sydra_link_pads(GstElement* src, GstPad* src_pad, const char* src_pad_name, GstElement* sink, GstPad* sink_pad, const char* sink_pad_name)
+{
+  if(!src_pad || !sink_pad)
+    return FALSE;
+
+  GstPadLinkReturn ret = gst_pad_link(src_pad, sink_pad);
+  gst_object_unref(GST_OBJECT(src_pad));
+  gst_object_unref(GST_OBJECT(sink_pad));
+
+  if(GST_PAD_LINK_FAILED(ret)) {
+    gchar* src_name = gst_element_get_name(src);
+    gchar* sink_name = gst_element_get_name(sink);
+    log_printf(ERROR, "Error linking pad '%s' of '%s' with pad '%s' of '%s'",
+               src_pad_name, src_name, sink_pad_name, sink_name);
+    g_free(src_name);
+    g_free(sink_name);
+    return FALSE;
+  }
+  return TRUE;
+}
+
+gboolean sydra_link_request_static(GstElement* src, const char* src_pad_name, GstElement* sink, const char* sink_pad_name)
+{
+  GstPad *src_pad = gst_element_get_request_pad(src, src_pad_name);
+  GstPad *sink_pad = gst_element_get_static_pad(sink, sink_pad_name);
+  return sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name);
+}
+
+gboolean sydra_link_static_request(GstElement* src, const char* src_pad_name, GstElement* sink, const char* sink_pad_name)
+{
+  GstPad *src_pad = gst_element_get_static_pad(src, src_pad_name);
+  GstPad *sink_pad = gst_element_get_request_pad(sink, sink_pad_name);
+  return sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name);
+}
+
+gboolean sydra_link_static_static(GstElement* src, const char* src_pad_name, GstElement* sink, const char* sink_pad_name)
+{
+  GstPad *src_pad = gst_element_get_static_pad(src, src_pad_name);
+  GstPad *sink_pad = gst_element_get_static_pad(sink, sink_pad_name);
+  return sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name);
+}
+
+gboolean sydra_link_static_compatible(GstElement* src, const char* src_pad_name, GstElement* sink)
+{
+  GstPad *src_pad = gst_element_get_static_pad(src, src_pad_name);
+  if(!src_pad) return FALSE;
+
+  GstPad *sink_pad = gst_element_get_compatible_pad(sink, src_pad, NULL);
+  if(!sink_pad) return FALSE;
+
+  gchar* sink_pad_name = gst_pad_get_name(sink_pad);
+  gboolean res = sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name);
+  g_free(sink_pad_name);
+
+  return res;
+}