gstreamer/subprojects/gst-docs/examples/tutorials/playback-tutorial-6.c

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#include <gst/gst.h>
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/* playbin2 flags */
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typedef enum
{
GST_PLAY_FLAG_VIS = (1 << 3) /* Enable rendering of visualizations when there is no video stream. */
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} GstPlayFlags;
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/* Return TRUE if this is a Visualization element */
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static gboolean
filter_vis_features (GstPluginFeature * feature, gpointer data)
{
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GstElementFactory *factory;
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if (!GST_IS_ELEMENT_FACTORY (feature))
return FALSE;
factory = GST_ELEMENT_FACTORY (feature);
if (!g_strrstr (gst_element_factory_get_klass (factory), "Visualization"))
return FALSE;
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return TRUE;
}
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int
main (int argc, char *argv[])
{
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GstElement *pipeline, *vis_plugin;
GstBus *bus;
GstMessage *msg;
GList *list, *walk;
GstElementFactory *selected_factory = NULL;
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guint flags;
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/* Initialize GStreamer */
gst_init (&argc, &argv);
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/* Get a list of all visualization plugins */
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list =
gst_registry_feature_filter (gst_registry_get (), filter_vis_features,
FALSE, NULL);
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/* Print their names */
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g_print ("Available visualization plugins:\n");
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for (walk = list; walk != NULL; walk = g_list_next (walk)) {
const gchar *name;
GstElementFactory *factory;
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factory = GST_ELEMENT_FACTORY (walk->data);
name = gst_element_factory_get_longname (factory);
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g_print (" %s\n", name);
if (selected_factory == NULL || g_str_has_prefix (name, "GOOM")) {
selected_factory = factory;
}
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}
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/* Don't use the factory if it's still empty */
/* e.g. no visualization plugins found */
if (!selected_factory) {
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g_print ("No visualization plugins found!\n");
return -1;
}
/* We have now selected a factory for the visualization element */
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g_print ("Selected '%s'\n",
gst_element_factory_get_longname (selected_factory));
vis_plugin = gst_element_factory_create (selected_factory, NULL);
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if (!vis_plugin)
return -1;
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/* Build the pipeline */
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pipeline =
gst_parse_launch ("playbin uri=http://radio.hbr1.com:19800/ambient.ogg",
NULL);
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/* Set the visualization flag */
g_object_get (pipeline, "flags", &flags, NULL);
flags |= GST_PLAY_FLAG_VIS;
g_object_set (pipeline, "flags", flags, NULL);
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/* set vis plugin for playbin2 */
g_object_set (pipeline, "vis-plugin", vis_plugin, NULL);
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/* Start playing */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
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/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
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msg =
gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
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/* Free resources */
if (msg != NULL)
gst_message_unref (msg);
gst_plugin_feature_list_free (list);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}