gstreamer/examples/helloworld2/helloworld2.c

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#include <gst/gst.h>
static void
gst_play_have_type (GstElement *typefind, GstCaps *caps, GstElement *pipeline)
{
GstElement *osssink;
GstElement *new_element;
GstAutoplug *autoplug;
GstElement *autobin;
GstElement *filesrc;
GstElement *cache;
GST_DEBUG ("GstPipeline: play have type");
gst_element_set_state (pipeline, GST_STATE_PAUSED);
filesrc = gst_bin_get_by_name (GST_BIN (pipeline), "disk_source");
autobin = gst_bin_get_by_name (GST_BIN (pipeline), "autobin");
cache = gst_bin_get_by_name (GST_BIN (autobin), "cache");
/* unlink_pads the typefind from the pipeline and remove it */
gst_element_unlink_pads (cache, "src", typefind, "sink");
gst_bin_remove (GST_BIN (autobin), typefind);
/* and an audio sink */
osssink = gst_element_factory_make("osssink", "play_audio");
g_assert(osssink != NULL);
autoplug = gst_autoplug_factory_make ("staticrender");
g_assert (autoplug != NULL);
new_element = gst_autoplug_to_renderers (autoplug,
caps,
osssink,
NULL);
if (!new_element) {
g_print ("could not autoplug, no suitable codecs found...\n");
exit (-1);
}
gst_element_set_name (new_element, "new_element");
gst_bin_add (GST_BIN (autobin), new_element);
g_object_set (G_OBJECT (cache), "reset", TRUE, NULL);
gst_element_link_pads (cache, "src", new_element, "sink");
gst_element_set_state (pipeline, GST_STATE_PLAYING);
}
static void
gst_play_cache_empty (GstElement *element, GstElement *pipeline)
{
GstElement *autobin;
GstElement *filesrc;
GstElement *cache;
GstElement *new_element;
fprintf (stderr, "have cache empty\n");
gst_element_set_state (pipeline, GST_STATE_PAUSED);
filesrc = gst_bin_get_by_name (GST_BIN (pipeline), "disk_source");
autobin = gst_bin_get_by_name (GST_BIN (pipeline), "autobin");
cache = gst_bin_get_by_name (GST_BIN (autobin), "cache");
new_element = gst_bin_get_by_name (GST_BIN (autobin), "new_element");
gst_element_unlink_pads (filesrc, "src", cache, "sink");
gst_element_unlink_pads (cache, "src", new_element, "sink");
gst_bin_remove (GST_BIN (autobin), cache);
gst_element_link_pads (filesrc, "src", new_element, "sink");
gst_element_set_state (pipeline, GST_STATE_PLAYING);
fprintf (stderr, "done with cache_empty\n");
}
int
main (int argc, char *argv[])
{
GstElement *filesrc;
GstElement *pipeline;
GstElement *autobin;
GstElement *typefind;
GstElement *cache;
gst_init (&argc, &argv);
if (argc != 2) {
g_print ("usage: %s <filename>\n", argv[0]);
exit (-1);
}
/* create a new pipeline to hold the elements */
pipeline = gst_pipeline_new ("pipeline");
g_assert (pipeline != NULL);
/* create a disk reader */
filesrc = gst_element_factory_make ("filesrc", "disk_source");
g_assert (filesrc != NULL);
g_object_set (G_OBJECT (filesrc), "location", argv[1], NULL);
gst_bin_add (GST_BIN (pipeline), filesrc);
autobin = gst_bin_new ("autobin");
cache = gst_element_factory_make ("autoplugcache", "cache");
g_signal_connect (G_OBJECT (cache), "cache_empty",
G_CALLBACK (gst_play_cache_empty), pipeline);
typefind = gst_element_factory_make ("typefind", "typefind");
g_signal_connect (G_OBJECT (typefind), "have_type",
G_CALLBACK (gst_play_have_type), pipeline);
gst_bin_add (GST_BIN (autobin), cache);
gst_bin_add (GST_BIN (autobin), typefind);
gst_element_link_pads (cache, "src", typefind, "sink");
gst_element_add_ghost_pad (autobin, gst_element_get_pad (cache, "sink"), "sink");
gst_bin_add (GST_BIN( pipeline), autobin);
gst_element_link_pads (filesrc, "src", autobin, "sink");
/* start playing */
gst_element_set_state( GST_ELEMENT (pipeline), GST_STATE_PLAYING);
while (gst_bin_iterate (GST_BIN (pipeline)));
/* stop the pipeline */
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
gst_object_unref (GST_OBJECT (pipeline));
exit(0);
}