autoplug

来源：互联网发布：ios 沙盒存储数组编辑：程序博客网时间：2024/06/13 00:38

http://www.oschina.net/code/explore/gstreamer-0.10.31/tests/examples/manual
http://web.mit.edu/ghudson/dev/nokrb/third/gstreamer/examples/
http://web.mit.edu/ghudson/dev/nokrb/third/gstreamer/gst/
http://permalink.gmane.org/gmane.comp.video.gstreamer.cvs/7089
http://mediatools.cs.ucl.ac.uk/nets/newvideo/browser/gst-cvs/gstreamer/examples
http://dandelion-patch.mit.edu/afs/dev/source/src-9.2/third/gstreamer/gst/autoplug/
http://dandelion-patch.mit.edu/afs/dev/source/src-9.2/third/gstreamer/examples/autoplug/

autoplug.cpp

#include <gst/gst.h>

static void
gst_play_have_type (GstElement *typefind, GstCaps *caps, GstElement *pipeline)
{
GstElement *osssink, *videosink, *videoelement, *colorspace;
GstElement *new_element;
GstAutoplug *autoplug;
GstElement *autobin;
GstElement *filesrc;
GstElement *cache;

GST_DEBUG (0,"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 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);

videosink = gst_bin_new ("videosink");
/* and an video sink */
videoelement = gst_element_factory_make ("xvideosink", "play_video");
g_assert (videosink != NULL);

colorspace = gst_element_factory_make ("colorspace", "colorspace");
g_assert (colorspace != NULL);

gst_element_link_pads (colorspace, "src", videoelement, "sink");
gst_bin_add (GST_BIN (videosink), colorspace);
gst_bin_add (GST_BIN (videosink), videoelement);

gst_element_add_ghost_pad (videosink,
gst_element_get_pad (colorspace, "sink"), "sink");

autoplug = gst_autoplug_factory_make ("staticrender");
g_assert (autoplug != NULL);

new_element = gst_autoplug_to_renderers (autoplug,
           caps,
           videosink,
           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);

#ifndef GST_DISABLE_LOADSAVE
gst_xml_write_file (GST_ELEMENT (pipeline), fopen ("xmlTest.gst", "w"));
#endif
}

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_many (filesrc, cache, new_element, NULL);
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;

g_thread_init(NULL);
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);
}

///////////////////////////////////////////

#include <stdlib.h>
#include <gst/gst.h>

gboolean playing = TRUE;

static void
handoff_signal (GstElement * element, GstBuffer * buf)
{
g_print ("handoff \"%s\" %" G_GINT64_FORMAT "\n",
gst_element_get_name (element), GST_BUFFER_TIMESTAMP (buf));
}

static void
eos_signal (GstElement * element)
{
g_print ("eos received from \"%s\"\n", gst_element_get_name (element));

playing = FALSE;
}

int
main (int argc, char *argv[])
{
GstBin *pipeline;
GstElement *src, *tee, *identity1, *identity2, *aggregator, *sink;

gst_init (&argc, &argv);

pipeline = GST_BIN (gst_pipeline_new ("pipeline"));
g_return_val_if_fail (pipeline != NULL, 1);

src = gst_element_factory_make ("fakesrc", "src");
g_object_set (G_OBJECT (src), "num_buffers", 40, NULL);
g_return_val_if_fail (src != NULL, 2);
tee = gst_element_factory_make ("tee", "tee");
g_return_val_if_fail (tee != NULL, 3);
identity1 = gst_element_factory_make ("identity", "identity0");
g_return_val_if_fail (identity1 != NULL, 3);
identity2 = gst_element_factory_make ("identity", "identity1");
g_object_set (G_OBJECT (identity2), "duplicate", 2, NULL);
g_object_set (G_OBJECT (identity2), "loop_based", TRUE, NULL);
g_return_val_if_fail (identity2 != NULL, 3);
aggregator = gst_element_factory_make ("aggregator", "aggregator");
g_object_set (G_OBJECT (aggregator), "sched", 4, NULL);
g_return_val_if_fail (aggregator != NULL, 3);
sink = gst_element_factory_make ("fakesink", "sink");
g_return_val_if_fail (sink != NULL, 4);

gst_bin_add_many (pipeline, src, tee, identity1, identity2, aggregator, sink,
NULL);

gst_element_link_pads (src, "src", tee, "sink");
gst_pad_link (gst_element_get_request_pad (tee, "src%d"),
      gst_element_get_pad (identity1, "sink"));
gst_pad_link (gst_element_get_request_pad (tee, "src%d"),
      gst_element_get_pad (identity2, "sink"));
gst_pad_link (gst_element_get_pad (identity1, "src"),
      gst_element_get_request_pad (aggregator, "sink%d"));
gst_pad_link (gst_element_get_pad (identity2, "src"),
      gst_element_get_request_pad (aggregator, "sink%d"));
gst_element_link_pads (aggregator, "src", sink, "sink");

g_signal_connect (G_OBJECT (src), "eos", G_CALLBACK (eos_signal), NULL);
g_signal_connect (G_OBJECT (sink), "handoff",
G_CALLBACK (handoff_signal), NULL);

gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);

while (gst_bin_iterate (pipeline));

gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);

exit (0);
}