gstreamer/gst/autoplug/spidertest.c

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#include <stdlib.h>
#include <gst/gst.h>
/* returns all factories which have a maximum of maxtemplates GstPadTemplates in direction dir
*/
GList *
gst_factories_at_most_templates(GList *factories, GstPadDirection dir, guint maxtemplates)
{
GList *ret = NULL;
while (factories)
{
guint count = 0;
GList *templs = ((GstElementFactory *) factories->data)->padtemplates;
while (templs)
{
if (GST_PADTEMPLATE_DIRECTION (templs->data) == dir)
{
count++;
}
if (count > maxtemplates)
break;
templs = g_list_next (templs);
}
if (count <= maxtemplates)
ret = g_list_prepend (ret, factories->data);
factories = g_list_next (factories);
}
return ret;
}
static void
property_change_callback (GObject *object, GstObject *orig, GParamSpec *pspec)
{
GValue value = { 0, }; /* the important thing is that value.type = 0 */
gchar *str = 0;
if (pspec->flags & G_PARAM_READABLE) {
g_value_init(&value, G_PARAM_SPEC_VALUE_TYPE (pspec));
g_object_get_property (G_OBJECT (orig), pspec->name, &value);
if (G_IS_PARAM_SPEC_STRING (pspec))
str = g_value_dup_string (&value);
else if (G_IS_PARAM_SPEC_ENUM (pspec))
str = g_strdup_printf ("%d", g_value_get_enum (&value));
else if (G_IS_PARAM_SPEC_INT64 (pspec))
str = g_strdup_printf ("%lld", g_value_get_int64 (&value));
else
str = g_strdup_value_contents (&value);
g_print ("%s: %s = %s\n", GST_OBJECT_NAME (orig), pspec->name, str);
g_free (str);
g_value_unset(&value);
} else {
g_warning ("Parameter not readable. What's up with that?");
}
}
static void
error_callback (GObject *object, GstObject *orig, gchar *error)
{
g_print ("ERROR: %s: %s\n", GST_OBJECT_NAME (orig), error);
}
/**
* Test program for the autoplugger.
* Uses new API extensions (2002-01-28), too.
*
* USAGE: spidertest <mediafile>
* If mediafile can be recognized, xvideo and oss audio output are tried.
*/
int main(int argc,char *argv[])
{
GstElement *bin, *filesrc, *decoder, *osssink, *videosink;
GList *facs;
if (argc < 2) {
g_print("usage: %s <file>\n", argv[0]);
exit(-1);
}
gst_init(&argc,&argv);
/* create a new bin to hold the elements */
bin = gst_pipeline_new("pipeline");
g_signal_connect (bin, "deep_notify", G_CALLBACK (property_change_callback), NULL);
g_signal_connect (bin, "error", G_CALLBACK (error_callback), NULL);
/* create a disk reader */
filesrc = gst_elementfactory_make("filesrc", "disk_source");
g_object_set(G_OBJECT(filesrc),"location", argv[1], NULL);
/* now it's time to get the decoder */
decoder = gst_elementfactory_make("spider", "spider");
if (!decoder) {
g_print ("could not find plugin \"spider\"\n");
exit (-2);
}
/* only use decoding plugins */
g_object_get (decoder, "factories", &facs, NULL);
facs = gst_factories_at_most_templates(facs, GST_PAD_SINK, 1);
g_object_set (decoder, "factories", facs, NULL);
/* create video and audio sink */
osssink = gst_elementfactory_make("osssink", "audio");
videosink = gst_elementfactory_make("xvideosink", "video");
if ((!osssink) || (!videosink)) {
g_print ("could not create output plugins\n");
exit (-3);
}
/* add objects to the main pipeline */
gst_bin_add(GST_BIN(bin), filesrc);
gst_bin_add(GST_BIN(bin), decoder);
gst_bin_add(GST_BIN(bin), osssink);
gst_bin_add(GST_BIN(bin), videosink);
/* connect objects */
if (!(gst_element_connect_elements(filesrc, decoder) &&
gst_element_connect_elements(decoder, osssink) &&
gst_element_connect_elements(decoder, videosink)))
{
g_print ("the pipeline could not be connected\n");
exit (-4);
}
gst_bin_use_clock (GST_BIN (bin), gst_system_clock_obtain ());
/* start playing */
gst_element_set_state(bin, GST_STATE_PLAYING);
while (gst_bin_iterate(GST_BIN(bin)));
exit(0);
}