Linux/AM5728: gst pipeline to c code

Hello Avinash Gowtham ,

First, you need a working pipeline. You could test the pipeline in the console with gst-launch.

After this you could use it in gst application.

1. You could use gst_parse_launch() function.

Here is example for video capture that is working on my side.

In this example just replace the video capture pipeline with yours.

#include <gst/gst.h>

#include <stdio.h>

int main(int argc, char *argv[])

{

GstElement *pipeline;

GstBus *bus;

GstMessage *msg;

const gchar *nano_str;

guint major, minor, micro, nano;

/* Initialize GStreamer */

gst_init (&argc, &argv);

gst_version (&major, &minor, &micro, &nano);

printf ("GStreamer Version: %d.%d.%d\n",major, minor, micro);

/* Build the pipeline */

pipeline = gst_parse_launch("v4l2src device=/dev/video1 num-buffers=1000 io-mode=4 ! video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720 ! vpe num-input-buffers=8 ! queue ! kmssink", NULL);

/* Start playing */

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);

/* 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;

}

This is how you could build it on the board in case your .c is named capture.c

gcc capture.c -o capture `pkg-config --libs --cflags gstreamer-1.0`

this is how to run it:

/etc/init.d/weston stop

./capture

Please notice that in the capsfilter(video/x-raw, format=(string)YUY2, width=(int)1280, height=(int)720) are missing " " or ' '.

If there is a capsfilter in your pipeline please remove "" or '' when you use this with gst_parse_launch.

2. The other way

-create elements with gst_element_factory_make();

-set properties  if any;

-Add elements to the bin

-link the elements this includes the capsfilters;

-Add a message handler etc.

Here are the gstreamer tutorials.

Hope this helps.

BR

Margarita