Linux/AM5728: GStreamer pipelines to C Code

Hello,

This is the easy way with gst_parse_launch().


#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

On my side this is working.

I would recommend you to start with this tutorial because gst_parse_launch is not the only option.
gstreamer.freedesktop.org/.../concepts.html

Hope this helps.

BR
Margarita