uftrace for GStreamer

This document is written by Joon Ho Ryu.

This page is partially copied from https://gstreamer.freedesktop.org/documentation/tutorials/index.html?gi-language
you might need required libraries for other tutorials which is not in this page.
For more detail reference the page.

Make sure you have superuser(root) access rights to install GStreamer

1. Download prerequisites

$ apt-get install libgstreamer1.0-0 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav gstreamer1.0-doc gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio

2. Download GStreamer

$ git clone https://gitlab.freedesktop.org/gstreamer/gst-docs

3. Example source code

basic-tutorial-1.c is from the link below.

• https://gstreamer.freedesktop.org/documentation/tutorials/basic/hello-world.html?gi-language=c

$ cat basic-tutorial-1.c
#include <gst/gst.h>

int
main (int argc, char *argv[])
{
  GstElement *pipeline;
  GstBus *bus;
  GstMessage *msg;

  /* Initialize GStreamer */
  gst_init (&argc, &argv);

  /* Build the pipeline */
  pipeline =
      gst_parse_launch
      ("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm",
      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;
}

4. Build the tutorials

$ gcc -pg basic-tutorial-1.c -o basic-tutorial-1 `pkg-config --cflags --libs gstreamer-1.0`

5. Record basic-tutorial-1.c

$ uftrace record -P . basic-tutorial-1

6. Replay output

$ uftrace replay
# DURATION     TID     FUNCTION
            [ 15661] | main() {
   5.788 ms [ 15661] |   gst_init();
   1.110 ms [ 15661] |   gst_parse_launch();
 741.006 us [ 15661] |   gst_element_set_state();
   0.593 us [ 15661] |   gst_element_get_bus();
   3.114  s [ 15661] |   gst_bus_timed_pop_filtered();
            [ 15661] |   gst_message_unref() {
   2.987 us [ 15661] |     gst_mini_object_unref();
   3.872 us [ 15661] |   } /* gst_message_unref */
   0.808 us [ 15661] |   gst_object_unref();
  60.858 ms [ 15661] |   gst_element_set_state();
 311.514 us [ 15661] |   gst_object_unref();
   3.183  s [ 15661] | } /* main */

7. uftrace tui

$ uftrace tui
TOTAL TIME : FUNCTION
    3.183  s : (1) basic-tutorial-1                                                                                           
    3.183  s : (1) main
    5.788 ms :  ├─(1) gst_init
             :  │
    1.110 ms :  ├─(1) gst_parse_launch
             :  │
   61.599 ms :  ├─(2) gst_element_set_state
             :  │
    0.593 us :  ├─(1) gst_element_get_bus
             :  │
    3.114  s :  ├─(1) gst_bus_timed_pop_filtered
             :  │
    3.872 us :  ├─(1) gst_message_unref
    2.987 us :  │ (1) gst_mini_object_unref
             :  │
  312.322 us :  └─(2) gst_object_unref