mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/*
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* this library handles interaction with GConf
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*/
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#include "gconf.h"
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#define GST_GCONF_DIR "/system/gstreamer"
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static GConfClient *_gst_gconf_client = NULL; /* GConf connection */
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/* internal functions */
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GConfClient *
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gst_gconf_get_client (void)
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{
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if (!_gst_gconf_client)
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_gst_gconf_client = gconf_client_get_default ();
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return _gst_gconf_client;
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}
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/* go through a bin, finding the one pad that is unconnected in the given
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* * direction, and return that pad */
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GstPad *
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gst_bin_find_unconnected_pad (GstBin *bin, GstPadDirection direction)
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{
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GstPad *pad = NULL;
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GList *elements = NULL;
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GList *pads = NULL;
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GstElement *element = NULL;
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g_print ("DEBUG: find_unconnected start\n");
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elements = (GList *) gst_bin_get_list (bin);
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/* traverse all elements looking for unconnected pads */
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while (elements && pad == NULL)
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{
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element = GST_ELEMENT (elements->data);
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g_print ("DEBUG: looking in element %s\n", gst_element_get_name (element));
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pads = gst_element_get_pad_list (element);
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while (pads)
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{
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/* check if the direction matches */
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if (GST_PAD_DIRECTION (GST_PAD (pads->data)) == direction)
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{
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if (GST_PAD_PEER (GST_PAD (pads->data)) == NULL)
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{
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/* found it ! */
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g_print ("DEBUG: found an unconnected pad !\n");
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pad = GST_PAD (pads->data);
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}
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}
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if (pad) break; /* found one already */
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pads = g_list_next (pads);
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}
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elements = g_list_next (elements);
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}
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g_print ("DEBUG: find_unconnected stop\n");
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return pad;
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}
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/* external functions */
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gchar *
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gst_gconf_get_string (const gchar *key)
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{
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GError *error = NULL;
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gchar *value = NULL;
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gchar *full_key = g_strdup_printf ("%s/%s", GST_GCONF_DIR, key);
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g_print ("DEBUG: full key: %s\n", full_key);
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value = gconf_client_get_string (gst_gconf_get_client (), full_key, &error);
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g_free (full_key);
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if (value)
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return value;
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else
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return NULL;
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// this is a good idea: return g_strdup (default_val);
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}
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void
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gst_gconf_set_string (const gchar *key, const gchar *value)
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{
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gconf_client_set_string (gst_gconf_get_client (), key, value, NULL);
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}
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/* this function renders the given description to a bin,
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* and ghosts at most one unconnected src pad and one unconnected sink pad */
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GstElement *
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gst_gconf_render_bin_from_description (const gchar *description)
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{
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GstElement *bin = NULL;
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GstPad *pad = NULL;
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GError *error = NULL;
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/* parse the pipeline */
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bin = GST_ELEMENT (gst_parse_launch (description, &error));
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if (error)
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{
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g_print ("DEBUG: gstgconf: error parsing pipeline %s\n%s\n",
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description, error->message);
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g_error_free (error);
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return NULL;
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}
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/* find pads and ghost them if necessary */
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if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SRC)))
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gst_element_add_ghost_pad (bin, pad, "src");
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if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SINK)))
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gst_element_add_ghost_pad (bin, pad, "sink");
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return bin;
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}
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/* this function reads the gconf key, parses the pipeline bit to a bin,
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* and ghosts at most one unconnected src pad and one unconnected sink pad */
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GstElement *
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gst_gconf_render_bin_from_key (const gchar *key)
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{
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GstElement *bin;
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gchar *description;
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gchar *value = NULL;
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value = gst_gconf_get_string (key);
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description = g_strdup_printf ("bin.( %s )", value);
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bin = gst_gconf_render_bin_from_description (description);
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g_free (description);
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return bin;
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}
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/*
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guint gst_gconf_notify_add (const gchar *key,
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GConfClientNotifyFunc func,
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gpointer user_data);
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*/
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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gst_plugin_set_longname (plugin,
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"Convenience routines for GConf interaction");
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"gstgconf",
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plugin_init
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};
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