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#include <gst/gst.h>
int
main (int argc, char *argv[])
{
GstElement *pipeline, *audio_source, *tee, *audio_queue, *audio_convert,
*audio_resample, *audio_sink;
GstElement *video_queue, *visual, *video_convert, *video_sink;
GstBus *bus;
GstMessage *msg;
GstPad *tee_audio_pad, *tee_video_pad;
GstPad *queue_audio_pad, *queue_video_pad;
/* Initialize GStreamer */
gst_init (&argc, &argv);
/* Create the elements */
audio_source = gst_element_factory_make ("audiotestsrc", "audio_source");
tee = gst_element_factory_make ("tee", "tee");
audio_queue = gst_element_factory_make ("queue", "audio_queue");
audio_convert = gst_element_factory_make ("audioconvert", "audio_convert");
audio_resample = gst_element_factory_make ("audioresample", "audio_resample");
audio_sink = gst_element_factory_make ("autoaudiosink", "audio_sink");
video_queue = gst_element_factory_make ("queue", "video_queue");
visual = gst_element_factory_make ("wavescope", "visual");
video_convert = gst_element_factory_make ("videoconvert", "video_convert");
video_sink = gst_element_factory_make ("autovideosink", "video_sink");
/* Create the empty pipeline */
pipeline = gst_pipeline_new ("test-pipeline");
if (!pipeline || !audio_source || !tee || !audio_queue || !audio_convert
|| !audio_resample || !audio_sink || !video_queue || !visual
|| !video_convert || !video_sink) {
g_printerr ("Not all elements could be created.\n");
return -1;
}
/* Configure elements */
g_object_set (audio_source, "freq", 215.0f, NULL);
g_object_set (visual, "shader", 0, "style", 1, NULL);
/* Link all elements that can be automatically linked because they have "Always" pads */
gst_bin_add_many (GST_BIN (pipeline), audio_source, tee, audio_queue,
audio_convert, audio_resample, audio_sink, video_queue, visual,
video_convert, video_sink, NULL);
if (gst_element_link_many (audio_source, tee, NULL) != TRUE
|| gst_element_link_many (audio_queue, audio_convert, audio_resample,
audio_sink, NULL) != TRUE
|| gst_element_link_many (video_queue, visual, video_convert, video_sink,
NULL) != TRUE) {
g_printerr ("Elements could not be linked.\n");
gst_object_unref (pipeline);
return -1;
}
/* Manually link the Tee, which has "Request" pads */
tee_audio_pad = gst_element_request_pad_simple (tee, "src_%u");
g_print ("Obtained request pad %s for audio branch.\n",
gst_pad_get_name (tee_audio_pad));
queue_audio_pad = gst_element_get_static_pad (audio_queue, "sink");
tee_video_pad = gst_element_request_pad_simple (tee, "src_%u");
g_print ("Obtained request pad %s for video branch.\n",
gst_pad_get_name (tee_video_pad));
queue_video_pad = gst_element_get_static_pad (video_queue, "sink");
if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||
gst_pad_link (tee_video_pad, queue_video_pad) != GST_PAD_LINK_OK) {
g_printerr ("Tee could not be linked.\n");
gst_object_unref (pipeline);
return -1;
}
gst_object_unref (queue_audio_pad);
gst_object_unref (queue_video_pad);
/* Start playing the pipeline */
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
msg =
gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE,
GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
/* Release the request pads from the Tee, and unref them */
gst_element_release_request_pad (tee, tee_audio_pad);
gst_element_release_request_pad (tee, tee_video_pad);
gst_object_unref (tee_audio_pad);
gst_object_unref (tee_video_pad);
/* Free resources */
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}
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