gstreamer/examples/queue/queue.c
Jan Schmidt ba5cecf321 examples/: Update a couple of the examples to work again.
Original commit message from CVS:
* examples/Makefile.am:
* examples/helloworld/helloworld.c: (event_loop), (main):
* examples/queue/queue.c: (event_loop), (main):
* examples/queue2/queue2.c: (main):
Update a couple of the examples to work again.

* gst/base/gstbasesink.c: (gst_base_sink_preroll_queue_empty),
(gst_base_sink_preroll_queue_flush), (gst_base_sink_handle_event):
Spelling corrections and extra debug.

* gst/gstbin.c: (gst_bin_class_init), (gst_bin_init), (is_eos),
(gst_bin_add_func), (bin_element_is_sink), (gst_bin_get_state),
(gst_bin_change_state), (gst_bin_dispose), (bin_bus_handler):
* gst/gstbin.h:
* gst/gstpipeline.c: (gst_pipeline_init), (gst_pipeline_dispose),
(gst_pipeline_change_state):
* gst/gstpipeline.h:
Move the bus handler for children to the GstBin, and create a
separate bus for receiving messages from children to the one the
bus sends 'upwards' on.
2005-07-06 16:22:47 +00:00

97 lines
2.4 KiB
C

#include <stdlib.h>
#include <gst/gst.h>
/* This example uses the queue element to create a buffer between 2 elements.
* The scheduler automatically uses 2 threads, 1 to feed and another to consume
* data from the queue buffer
*/
/* Event loop to listen to events posted on the GstBus from the pipeline. Exits
* on EOS or ERROR events
*/
static void
event_loop (GstElement * pipe)
{
GstBus *bus;
GstMessageType revent;
GstMessage *message = NULL;
bus = gst_element_get_bus (GST_ELEMENT (pipe));
while (TRUE) {
revent = gst_bus_poll (bus, GST_MESSAGE_ANY, -1);
message = gst_bus_pop (bus);
g_assert (message != NULL);
switch (revent) {
case GST_MESSAGE_EOS:
gst_message_unref (message);
return;
case GST_MESSAGE_WARNING:
case GST_MESSAGE_ERROR:{
GError *gerror;
gchar *debug;
gst_message_parse_error (message, &gerror, &debug);
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
gst_message_unref (message);
g_error_free (gerror);
g_free (debug);
return;
}
default:
gst_message_unref (message);
break;
}
}
}
int
main (int argc, char *argv[])
{
GstElement *filesrc, *audiosink, *decode, *queue;
GstElement *pipeline;
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);
decode = gst_element_factory_make ("mad", "decode");
g_assert (decode != NULL);
queue = gst_element_factory_make ("queue", "queue");
g_assert (queue != NULL);
/* and an audio sink */
audiosink = gst_element_factory_make ("alsasink", "play_audio");
g_assert (audiosink != NULL);
/* add objects to the main pipeline */
gst_bin_add_many (GST_BIN (pipeline), filesrc, decode, queue, audiosink,
NULL);
gst_element_link_many (filesrc, decode, queue, audiosink, NULL);
/* start playing */
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
/* Listen for EOS */
event_loop (pipeline);
gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);
exit (0);
}