tests/icles/gdkpixbufoverlay-test.c - mtk-gst-plugins-good-debian - Git at Google

 /* GStreamer gdkpixbufoverlay test app
  * Copyright (C) 2014 Tim-Philipp Müller <tim centricular com>

  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public
  * License along with this library; if not, write to the
  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <gio/gio.h>
 #include <gst/gst.h>
 #include <gst/video/video.h>
 #include <gdk-pixbuf/gdk-pixbuf.h>

 #include <math.h>

 #define VIDEO_WIDTH 720
 #define VIDEO_HEIGHT 480
 #define VIDEO_FPS 50

 /* GdkPixbuf RGBA C-Source image dump from gdk-pixbuf-csource --raw,
  * gzipped and then base64 encoded */
 const gchar gzipped_pixdata_base64[] =
     "H4sICPX/Z1QAA2xvZ28ucGl4AO2dsZHrNhCG+ewK2II64ClyrhmnTtSBh4kLUOLQAUuwEhSgFtiA"
     "A7agwA2wBT5AXJ5w4P5LgKLEO97ezDf2SCAIAftjFwuQ7/c///ojy/77+8eP7Jcs+/WfLMv+t/zW"
     "dV32pSmK3HK6sXZbFOXV9PZfWipLbWksHdHQZxVpZP+Ee7u62/d7rt0fivIqimJnOX+w/zhauq68"
     "aWjevfdUR1h3vXq/KMqzufueFN1J1FE+stf8KfCzobZ3q/ePojyT3v8gDSyB09GFND7g/N014rpl"
     "41xF+Wz0/i817nwFjepP+Rb0PnDwOUOehePyQq1eurlrSkXZOkVx7OblbGK43upf+zcqyldhOT22"
     "5GvV9ynKXIriQDpKye242Ldcve2KskX6deaRWVeebnpdu32Koryc4t/iaKksmm9Vvg3W3neWk+Vs"
     "qS2tpSOu9NmZtLG4f7R15paS7jXct1q7XxTl2ZDd157dp1A/6q9I+1Wg+QH1g8pmcb7M0szUHseV"
     "/KTTtJg39XyudH/NASmbhfzOUtqTNHmhew1cglhT9ad8O16kv7m4eFT3/pVNQ77IX8shLgW/RnsW"
     "Li7V5y4UJaDo9wnOT9Sjq1fzn4oSQXHft4tZ00Vpr5jI3yiKwmO1sy/63GZKzNpS+dVyLsaYneVk"
     "Ud+rbIqi32M/kC7DtaXzn6vt9Vm95ZbS0lg64rx2nynKdyHQ3oC+A06ZxdtbkztWundpqS1fKo5j"
     "9OfQ8+jKJNbW987eye47QGO5WE6u/BPakJP2rt4927X7JhanNaBBzQUpEMbmU2hJk66O2ftt7lrS"
     "f8vc4yl+0P7llspyWapOl3th9Hdde4yVz4m17eMD2pP8ZBXjI0l3J7oG1Rf1DlH7dyBOpKuB2+dB"
     "2ZzKXS3ugw9+lnKZB49oH2bL1owGH9K4vX5P7Yg+0+O1/Uj/XSRm8ep9Ws6LclrRfe+N1+xYIxjz"
     "49Jrh6D+m68inSypPeQja7pXRZp3/z1P6M7XM+xX+7eznElHc3E63Hv2xWmoo89H4yLEnpDg+orq"
     "DsnJFq7oWqYtLhd7sbTg3i3dL2VO2Xlt5Oo7DzY1Uc8VtOng9eMZtP0ctpnmJa787Tcm/jbUtmHc"
     "xfmG+p0bwz0R9t1hYr33WTgj/ZEfe1R7HfnJ3NNCjIbKoP8f1SBn2w2Nq3htYI9o7uBopnRI9nmO"
     "rM/ZveijhWulee+DFrx2xZSHe0Gmn99ix5sd96A+1E97w88pB8bX1ABubfYK4DxG+msYPbWWksqU"
     "gu5a0u/O68PQ3t99hWF8kW9vC2gQaWTyWtD2sB5UVzOhGeRLJR2y/pB0k9RHgCqxXaP2kP5Qn9TU"
     "n+He7rumwO/j5oSr0FanQZf/jIp33+650qXXjSj2FP2+y58AbYVrPs5PjuyOxsTvq5H+yYb8Mofg"
     "u8rgmKb2vq/C+lPtMLj2KOjBbyPSqTS3N9T2Y/D5SbAtdt1r4uapoZ9ife+VroHzlQn2ZCf0dw7K"
     "7rk2Cn2VMo6z15pP1KPzt5N72LT+4/Q36hv7d+R8INN/oR2zdunZEcyvANuEPj3SNlkNmvHcIY6x"
     "4eeHWbkiSfugvBT3jeLYifKdCdaHggbC+Q7Vi+YOriznW5PG8BENAj3G5FYQTsslWvcxuqqABke6"
     "oXzoqGyEfcC1kunnXRRvcfOm2N9mOo4szX1df/DnB4P9BbsOMmANNXf8F9TgaB1p5LlppBehfr+/"
     "0PiwuhJ+Y+hbpXpbGsNbLtTcc66LPzP31u+rDznPesJPDnnS5Ny2oMGRnSdoEOVERjpE2qTvTmAc"
     "pGuQ7Yg5EyP7QDY3gjQozREzNIhiNXTv1Ni1BeOCyvvxOJqzUJtzUD6MWaX1wKd4P9HbgmfdhFwL"
     "p0FOr9x6EOngmtKHpt8TGNUxcQ2yTXGeNLL/lHz4Qxo09/0tNN8gH4zainIcyK7ZuF7Q4D6iDal1"
     "1kE5ZD+bfD+DsB48BuXy7L7//mEvgulrKWd3iyUi7ZPzS+J6C1wz+XyFkfMWB0D02tHrl2FfMDYX"
     "yfUvitXg2QvBrlHMyM4JEW3oqC+5/orymwbEUWtr5ck65PKidVCGy4leh71AZgwlv9JN6VDQsZSP"
     "QddM+iUw7nM5BHWn7jWKbRf6VsrJcjEFtGug2dr7HvntOYQa5OanTT8jY//2tMcXauxCuVBOo+9n"
     "YYRxnNIhvN7g2AnGI+iamD4w6bnwqN810QctaUM6V8LlDJFPk9a7qfllzmdVEW2Yg18vmkc/xTrw"
     "yTqU9uDD/fgK+b9EHcK1nTDGcF0Hrok6Gyu00c33KBZlifztYY6fPbcG2poUqwl2LeWXuXv4OVEp"
     "95XUX/6Yoj5bWx8v0F8OfN3g72rS3TFWewk6RHuHXOwkjoXhfVnsOcdFc5xUJ/Jto7gKlEX5xUlN"
     "x/T/RNvFvhA0GDXnCfedPY9+ZUhjvu4Wfy5P0CHKoXGaEMci1TYj7sfqJbI+uBfwSNuFelPPXkp+"
     "k823BGXQWuGh3AmYRzf9zpKMOfvyYB8uEiuC8ZXO00zuZ020G83rs8Y/xU8gmwcaRPVKa+uk/LLh"
     "8y1NUEbKfc+aww3eP/xS73xIBez5XbKPzwuW3H4h6Ec3j6E9ba6PkR9MGgvBNmPbLeXa58TfKRqM"
     "brtJPJuTom/vGm4dwJ2lQXmsWe/cM4l7mFtBOCcjPR+B9iMGW4LnGWLHa4bdzNqbj6wj2QYEXYX+"
     "JPWMKlcOvpdEaIcUu0blUA1eX7Bnbx7os02/N4iLRSMY7QuacWwSc24YjhXQgxQ/sT4s0QbQs2kO"
     "dl1o+hiYs09p/8x/7kPaqw/3GZGfkPbmka9C5wiQ30RzJdp3R2cTh3MKozk6ta1bgfYGUzU42sMX"
     "xsP1q4ttuLxfci7Ps18/RwfPI6f2x4QOG087/m8arRlN2vN9yP+G5yiTcpETbUBxCpo7kGZzof3D"
     "OwGG56ca7/NwDkdrwc1qUNiXT4Hrx9hn1WLOj0n7wDF7Vcka9Gw39lyL9Gz51P78ebAv1G9BfWiv"
     "A2kQ+mKhzbP2aEz8s8DsmWGDfbxjc/+OENDfib4b3uNUejmZqGd8g/5EY3k1CWt2cz9nONR380XM"
     "+HPvHlnivU/ce19aA96FA/TsP2984q6jcpeg/f75kTyoxwfFiSW6ZkJLHDHvt8np93Hv3xliCLT2"
     "OIEx3OTeILMf2EztCYKYNcYG2fMQivKdYbQUpY1s/M6ZTcbpivJMMv5Zpdhn7mdpV1GUO1l/NjTU"
     "Usx7Z8Iz3ZuM0xXlFWT8s4CsDkmzJZPD0ThUUWaSye8THZ6RqOj/uf2L1f79T0XZCpn8vJJ0Pkb9"
     "n6IsCOVoBp/HvS+moe83+T4dRVEUZRmyn2F9swl9yAAA";

 static GdkPixbuf *logo_pixbuf;

 static GMainLoop *main_loop;
 static gint count;

 static GdkPixbuf *
 create_overlay_pixbuf (void)
 {
   GZlibDecompressor *decompress;
   GConverterResult decomp_res;
   guchar *gzipped_pixdata, *pixdata, *pixels_copy;
   gsize gzipped_size, bytes_read, pixdata_size;
   guint stride, width, height;
   GdkPixbuf *pixbuf;

   gzipped_pixdata = g_base64_decode (gzipped_pixdata_base64, &gzipped_size);
   g_assert (gzipped_pixdata != NULL);

   pixdata = g_malloc (64 * 1024);

   decompress = g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP);
   decomp_res = g_converter_convert (G_CONVERTER (decompress),
       gzipped_pixdata, gzipped_size, pixdata, 64 * 1024,
       G_CONVERTER_INPUT_AT_END, &bytes_read, &pixdata_size, NULL);
   g_assert (decomp_res == G_CONVERTER_FINISHED);
   g_assert (bytes_read == gzipped_size);
   g_free (gzipped_pixdata);
   g_object_unref (decompress);

   /* 0: Pixbuf magic (0x47646b50) */
   g_assert (GST_READ_UINT32_BE (pixdata) == 0x47646b50);

   /* pixdata length */
   pixdata_size = GST_READ_UINT32_BE (pixdata + 4);
   g_assert (pixdata_size > 4 + 4 + 4 + 4 + 4 + 4);

   /* raw, 8-bit depth, RGBA */
   g_assert (GST_READ_UINT32_BE (pixdata + 8) == 0x01010002);

   stride = GST_READ_UINT32_BE (pixdata + 12);
   width = GST_READ_UINT32_BE (pixdata + 16);
   height = GST_READ_UINT32_BE (pixdata + 20);

   g_assert (pixdata_size == 24 + height * stride);

   pixels_copy = g_memdup (pixdata + 24, height * stride);

   pixbuf =
       gdk_pixbuf_new_from_data (pixels_copy, GDK_COLORSPACE_RGB, TRUE, 8,
       width, height, stride, (GdkPixbufDestroyNotify) g_free, pixels_copy);

   g_assert (pixbuf != NULL);

   g_free (pixdata);

   return pixbuf;
 }

 static gboolean
 bus_cb (GstBus * bus, GstMessage * msg, gpointer user_data)
 {
   GMainLoop *loop = user_data;

   switch (GST_MESSAGE_TYPE (msg)) {
     case GST_MESSAGE_ERROR:{
       GError *err = NULL;
       gchar *dbg;

       gst_message_parse_error (msg, &err, &dbg);
       gst_object_default_error (msg->src, err, dbg);
       g_clear_error (&err);
       g_free (dbg);
       g_main_loop_quit (loop);
       break;
     }
     default:
       break;
   }
   return TRUE;
 }

 #define SPEED_SCALE_FACTOR (VIDEO_FPS * 4)

 /* nicked from videotestsrc's ball pattern renderer */
 static void
 calculate_position (gint * x, gint * y, guint logo_w, guint logo_h, guint n)
 {
   guint r_x = logo_w / 2;
   guint r_y = logo_h / 2;
   guint w = VIDEO_WIDTH + logo_w;
   guint h = VIDEO_HEIGHT + logo_h;

   *x = r_x + (0.5 + 0.5 * sin (2 * G_PI * n / SPEED_SCALE_FACTOR))
       * (w - 2 * r_x);
   *y = r_y + (0.5 + 0.5 * sin (2 * G_PI * sqrt (2) * n / SPEED_SCALE_FACTOR))
       * (h - 2 * r_y);

   *x -= logo_w;
   *y -= logo_h;
 }

 static GstPadProbeReturn
 buffer_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
 {
   GstElement *overlay = GST_PAD_PARENT (pad);
   gint x, y, w, h;

   w = gdk_pixbuf_get_width (logo_pixbuf);
   h = gdk_pixbuf_get_height (logo_pixbuf);

   calculate_position (&x, &y, w, h, ++count);

   GST_LOG ("%3d, %3d", x, y);

   g_object_set (overlay, "offset-x", x, "offset-y", y, NULL);

   return GST_PAD_PROBE_OK;
 }

 int
 main (int argc, char **argv)
 {
   GOptionEntry options[] = {
     {NULL}
   };
   GOptionContext *ctx;
   GError *err = NULL;
   GstElement *src, *q, *capsfilter, *overlay, *sink;
   GstElement *pipeline;
   GstPad *sink_pad;
   GstCaps *filter_caps;

   ctx = g_option_context_new ("");
   g_option_context_add_main_entries (ctx, options, GETTEXT_PACKAGE);
   g_option_context_add_group (ctx, gst_init_get_option_group ());
   if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
     g_print ("Error initializing: %s\n", err->message);
     g_option_context_free (ctx);
     g_clear_error (&err);
     return 1;
   }
   g_option_context_free (ctx);

   logo_pixbuf = create_overlay_pixbuf ();

   main_loop = g_main_loop_new (NULL, FALSE);

   pipeline = gst_pipeline_new ("pipeline");

   src = gst_element_factory_make ("videotestsrc", NULL);
   gst_util_set_object_arg (G_OBJECT (src), "pattern", "white");

   overlay = gst_element_factory_make ("gdkpixbufoverlay", NULL);

   /* set positioning-mode to absolute so we can set negative positions */
   g_object_set (overlay, "pixbuf", logo_pixbuf, "positioning-mode", 1, NULL);

   sink_pad = gst_element_get_static_pad (overlay, "sink");
   gst_pad_add_probe (sink_pad, GST_PAD_PROBE_TYPE_BUFFER, buffer_cb, NULL,
       NULL);
   gst_object_unref (sink_pad);

   q = gst_element_factory_make ("queue", NULL);

   capsfilter = gst_element_factory_make ("capsfilter", NULL);
   filter_caps = gst_caps_from_string ("video/x-raw, format = "
       GST_VIDEO_OVERLAY_COMPOSITION_BLEND_FORMATS);
   gst_caps_set_simple (filter_caps,
       "width", G_TYPE_INT, VIDEO_WIDTH,
       "height", G_TYPE_INT, VIDEO_HEIGHT,
       "framerate", GST_TYPE_FRACTION, VIDEO_FPS, 1, NULL);
   g_object_set (capsfilter, "caps", filter_caps, NULL);
   gst_caps_unref (filter_caps);

   sink = gst_element_factory_make ("ximagesink", NULL);

   gst_bin_add_many (GST_BIN (pipeline), src, q, overlay, capsfilter, sink,
       NULL);

   gst_element_link_many (src, q, overlay, capsfilter, sink, NULL);

   count = 0;

   gst_element_set_state (pipeline, GST_STATE_PLAYING);

   gst_bus_add_watch (GST_ELEMENT_BUS (pipeline), bus_cb, main_loop);

   g_main_loop_run (main_loop);

   gst_element_set_state (pipeline, GST_STATE_NULL);
   gst_object_unref (pipeline);
   g_object_unref (logo_pixbuf);

   return 0;
 }
	/* GStreamer gdkpixbufoverlay test app
	* Copyright (C) 2014 Tim-Philipp Müller <tim centricular com>

	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Library General Public
	* License as published by the Free Software Foundation; either
	* version 2 of the License, or (at your option) any later version.
	*
	* This library is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* Library General Public License for more details.
	*
	* You should have received a copy of the GNU Library General Public
	* License along with this library; if not, write to the
	* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
	* Boston, MA 02110-1301, USA.
	*/

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <gio/gio.h>
	#include <gst/gst.h>
	#include <gst/video/video.h>
	#include <gdk-pixbuf/gdk-pixbuf.h>

	#include <math.h>

	#define VIDEO_WIDTH 720
	#define VIDEO_HEIGHT 480
	#define VIDEO_FPS 50

	/* GdkPixbuf RGBA C-Source image dump from gdk-pixbuf-csource --raw,
	* gzipped and then base64 encoded */
	const gchar gzipped_pixdata_base64[] =
	"H4sICPX/Z1QAA2xvZ28ucGl4AO2dsZHrNhCG+ewK2II64ClyrhmnTtSBh4kLUOLQAUuwEhSgFtiA"
	"A7agwA2wBT5AXJ5w4P5LgKLEO97ezDf2SCAIAftjFwuQ7/c///ojy/77+8eP7Jcs+/WfLMv+t/zW"
	"dV32pSmK3HK6sXZbFOXV9PZfWipLbWksHdHQZxVpZP+Ee7u62/d7rt0fivIqimJnOX+w/zhauq68"
	"aWjevfdUR1h3vXq/KMqzufueFN1J1FE+stf8KfCzobZ3q/ePojyT3v8gDSyB09GFND7g/N014rpl"
	"41xF+Wz0/i817nwFjepP+Rb0PnDwOUOehePyQq1eurlrSkXZOkVx7OblbGK43upf+zcqyldhOT22"
	"5GvV9ynKXIriQDpKye242Ldcve2KskX6deaRWVeebnpdu32Koryc4t/iaKksmm9Vvg3W3neWk+Vs"
	"qS2tpSOu9NmZtLG4f7R15paS7jXct1q7XxTl2ZDd157dp1A/6q9I+1Wg+QH1g8pmcb7M0szUHseV"
	"/KTTtJg39XyudH/NASmbhfzOUtqTNHmhew1cglhT9ad8O16kv7m4eFT3/pVNQ77IX8shLgW/RnsW"
	"Li7V5y4UJaDo9wnOT9Sjq1fzn4oSQXHft4tZ00Vpr5jI3yiKwmO1sy/63GZKzNpS+dVyLsaYneVk"
	"Ud+rbIqi32M/kC7DtaXzn6vt9Vm95ZbS0lg64rx2nynKdyHQ3oC+A06ZxdtbkztWundpqS1fKo5j"
	"9OfQ8+jKJNbW987eye47QGO5WE6u/BPakJP2rt4927X7JhanNaBBzQUpEMbmU2hJk66O2ftt7lrS"
	"f8vc4yl+0P7llspyWapOl3th9Hdde4yVz4m17eMD2pP8ZBXjI0l3J7oG1Rf1DlH7dyBOpKuB2+dB"
	"2ZzKXS3ugw9+lnKZB49oH2bL1owGH9K4vX5P7Yg+0+O1/Uj/XSRm8ep9Ws6LclrRfe+N1+xYIxjz"
	"49Jrh6D+m68inSypPeQja7pXRZp3/z1P6M7XM+xX+7eznElHc3E63Hv2xWmoo89H4yLEnpDg+orq"
	"DsnJFq7oWqYtLhd7sbTg3i3dL2VO2Xlt5Oo7DzY1Uc8VtOng9eMZtP0ctpnmJa787Tcm/jbUtmHc"
	"xfmG+p0bwz0R9t1hYr33WTgj/ZEfe1R7HfnJ3NNCjIbKoP8f1SBn2w2Nq3htYI9o7uBopnRI9nmO"
	"rM/ZveijhWulee+DFrx2xZSHe0Gmn99ix5sd96A+1E97w88pB8bX1ABubfYK4DxG+msYPbWWksqU"
	"gu5a0u/O68PQ3t99hWF8kW9vC2gQaWTyWtD2sB5UVzOhGeRLJR2y/pB0k9RHgCqxXaP2kP5Qn9TU"
	"n+He7rumwO/j5oSr0FanQZf/jIp33+650qXXjSj2FP2+y58AbYVrPs5PjuyOxsTvq5H+yYb8Mofg"
	"u8rgmKb2vq/C+lPtMLj2KOjBbyPSqTS3N9T2Y/D5SbAtdt1r4uapoZ9ife+VroHzlQn2ZCf0dw7K"
	"7rk2Cn2VMo6z15pP1KPzt5N72LT+4/Q36hv7d+R8INN/oR2zdunZEcyvANuEPj3SNlkNmvHcIY6x"
	"4eeHWbkiSfugvBT3jeLYifKdCdaHggbC+Q7Vi+YOriznW5PG8BENAj3G5FYQTsslWvcxuqqABke6"
	"oXzoqGyEfcC1kunnXRRvcfOm2N9mOo4szX1df/DnB4P9BbsOMmANNXf8F9TgaB1p5LlppBehfr+/"
	"0PiwuhJ+Y+hbpXpbGsNbLtTcc66LPzP31u+rDznPesJPDnnS5Ny2oMGRnSdoEOVERjpE2qTvTmAc"
	"pGuQ7Yg5EyP7QDY3gjQozREzNIhiNXTv1Ni1BeOCyvvxOJqzUJtzUD6MWaX1wKd4P9HbgmfdhFwL"
	"p0FOr9x6EOngmtKHpt8TGNUxcQ2yTXGeNLL/lHz4Qxo09/0tNN8gH4zainIcyK7ZuF7Q4D6iDal1"
	"1kE5ZD+bfD+DsB48BuXy7L7//mEvgulrKWd3iyUi7ZPzS+J6C1wz+XyFkfMWB0D02tHrl2FfMDYX"
	"yfUvitXg2QvBrlHMyM4JEW3oqC+5/orymwbEUWtr5ck65PKidVCGy4leh71AZgwlv9JN6VDQsZSP"
	"QddM+iUw7nM5BHWn7jWKbRf6VsrJcjEFtGug2dr7HvntOYQa5OanTT8jY//2tMcXauxCuVBOo+9n"
	"YYRxnNIhvN7g2AnGI+iamD4w6bnwqN810QctaUM6V8LlDJFPk9a7qfllzmdVEW2Yg18vmkc/xTrw"
	"yTqU9uDD/fgK+b9EHcK1nTDGcF0Hrok6Gyu00c33KBZlifztYY6fPbcG2poUqwl2LeWXuXv4OVEp"
	"95XUX/6Yoj5bWx8v0F8OfN3g72rS3TFWewk6RHuHXOwkjoXhfVnsOcdFc5xUJ/Jto7gKlEX5xUlN"
	"x/T/RNvFvhA0GDXnCfedPY9+ZUhjvu4Wfy5P0CHKoXGaEMci1TYj7sfqJbI+uBfwSNuFelPPXkp+"
	"k823BGXQWuGh3AmYRzf9zpKMOfvyYB8uEiuC8ZXO00zuZ020G83rs8Y/xU8gmwcaRPVKa+uk/LLh"
	"8y1NUEbKfc+aww3eP/xS73xIBez5XbKPzwuW3H4h6Ec3j6E9ba6PkR9MGgvBNmPbLeXa58TfKRqM"
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	static GdkPixbuf *logo_pixbuf;

	static GMainLoop *main_loop;
	static gint count;

	static GdkPixbuf *
	create_overlay_pixbuf (void)
	{
	GZlibDecompressor *decompress;
	GConverterResult decomp_res;
	guchar gzipped_pixdata, pixdata, *pixels_copy;
	gsize gzipped_size, bytes_read, pixdata_size;
	guint stride, width, height;
	GdkPixbuf *pixbuf;

	gzipped_pixdata = g_base64_decode (gzipped_pixdata_base64, &gzipped_size);
	g_assert (gzipped_pixdata != NULL);

	pixdata = g_malloc (64 * 1024);

	decompress = g_zlib_decompressor_new (G_ZLIB_COMPRESSOR_FORMAT_GZIP);
	decomp_res = g_converter_convert (G_CONVERTER (decompress),
	gzipped_pixdata, gzipped_size, pixdata, 64 * 1024,
	G_CONVERTER_INPUT_AT_END, &bytes_read, &pixdata_size, NULL);
	g_assert (decomp_res == G_CONVERTER_FINISHED);
	g_assert (bytes_read == gzipped_size);
	g_free (gzipped_pixdata);
	g_object_unref (decompress);

	/* 0: Pixbuf magic (0x47646b50) */
	g_assert (GST_READ_UINT32_BE (pixdata) == 0x47646b50);

	/* pixdata length */
	pixdata_size = GST_READ_UINT32_BE (pixdata + 4);
	g_assert (pixdata_size > 4 + 4 + 4 + 4 + 4 + 4);

	/* raw, 8-bit depth, RGBA */
	g_assert (GST_READ_UINT32_BE (pixdata + 8) == 0x01010002);

	stride = GST_READ_UINT32_BE (pixdata + 12);
	width = GST_READ_UINT32_BE (pixdata + 16);
	height = GST_READ_UINT32_BE (pixdata + 20);

	g_assert (pixdata_size == 24 + height * stride);

	pixels_copy = g_memdup (pixdata + 24, height * stride);

	pixbuf =
	gdk_pixbuf_new_from_data (pixels_copy, GDK_COLORSPACE_RGB, TRUE, 8,
	width, height, stride, (GdkPixbufDestroyNotify) g_free, pixels_copy);

	g_assert (pixbuf != NULL);

	g_free (pixdata);

	return pixbuf;
	}

	static gboolean
	bus_cb (GstBus * bus, GstMessage * msg, gpointer user_data)
	{
	GMainLoop *loop = user_data;

	switch (GST_MESSAGE_TYPE (msg)) {
	case GST_MESSAGE_ERROR:{
	GError *err = NULL;
	gchar *dbg;

	gst_message_parse_error (msg, &err, &dbg);
	gst_object_default_error (msg->src, err, dbg);
	g_clear_error (&err);
	g_free (dbg);
	g_main_loop_quit (loop);
	break;
	}
	default:
	break;
	}
	return TRUE;
	}

	#define SPEED_SCALE_FACTOR (VIDEO_FPS * 4)

	/* nicked from videotestsrc's ball pattern renderer */
	static void
	calculate_position (gint * x, gint * y, guint logo_w, guint logo_h, guint n)
	{
	guint r_x = logo_w / 2;
	guint r_y = logo_h / 2;
	guint w = VIDEO_WIDTH + logo_w;
	guint h = VIDEO_HEIGHT + logo_h;

	x = r_x + (0.5 + 0.5 sin (2 * G_PI * n / SPEED_SCALE_FACTOR))
	* (w - 2 * r_x);
	y = r_y + (0.5 + 0.5 sin (2 * G_PI * sqrt (2) * n / SPEED_SCALE_FACTOR))
	* (h - 2 * r_y);

	*x -= logo_w;
	*y -= logo_h;
	}

	static GstPadProbeReturn
	buffer_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
	{
	GstElement *overlay = GST_PAD_PARENT (pad);
	gint x, y, w, h;

	w = gdk_pixbuf_get_width (logo_pixbuf);
	h = gdk_pixbuf_get_height (logo_pixbuf);

	calculate_position (&x, &y, w, h, ++count);

	GST_LOG ("%3d, %3d", x, y);

	g_object_set (overlay, "offset-x", x, "offset-y", y, NULL);

	return GST_PAD_PROBE_OK;
	}

	int
	main (int argc, char **argv)
	{
	GOptionEntry options[] = {
	{NULL}
	};
	GOptionContext *ctx;
	GError *err = NULL;
	GstElement src, q, capsfilter, overlay, *sink;
	GstElement *pipeline;
	GstPad *sink_pad;
	GstCaps *filter_caps;

	ctx = g_option_context_new ("");
	g_option_context_add_main_entries (ctx, options, GETTEXT_PACKAGE);
	g_option_context_add_group (ctx, gst_init_get_option_group ());
	if (!g_option_context_parse (ctx, &argc, &argv, &err)) {
	g_print ("Error initializing: %s\n", err->message);
	g_option_context_free (ctx);
	g_clear_error (&err);
	return 1;
	}
	g_option_context_free (ctx);

	logo_pixbuf = create_overlay_pixbuf ();

	main_loop = g_main_loop_new (NULL, FALSE);

	pipeline = gst_pipeline_new ("pipeline");

	src = gst_element_factory_make ("videotestsrc", NULL);
	gst_util_set_object_arg (G_OBJECT (src), "pattern", "white");

	overlay = gst_element_factory_make ("gdkpixbufoverlay", NULL);

	/* set positioning-mode to absolute so we can set negative positions */
	g_object_set (overlay, "pixbuf", logo_pixbuf, "positioning-mode", 1, NULL);

	sink_pad = gst_element_get_static_pad (overlay, "sink");
	gst_pad_add_probe (sink_pad, GST_PAD_PROBE_TYPE_BUFFER, buffer_cb, NULL,
	NULL);
	gst_object_unref (sink_pad);

	q = gst_element_factory_make ("queue", NULL);

	capsfilter = gst_element_factory_make ("capsfilter", NULL);
	filter_caps = gst_caps_from_string ("video/x-raw, format = "
	GST_VIDEO_OVERLAY_COMPOSITION_BLEND_FORMATS);
	gst_caps_set_simple (filter_caps,
	"width", G_TYPE_INT, VIDEO_WIDTH,
	"height", G_TYPE_INT, VIDEO_HEIGHT,
	"framerate", GST_TYPE_FRACTION, VIDEO_FPS, 1, NULL);
	g_object_set (capsfilter, "caps", filter_caps, NULL);
	gst_caps_unref (filter_caps);

	sink = gst_element_factory_make ("ximagesink", NULL);

	gst_bin_add_many (GST_BIN (pipeline), src, q, overlay, capsfilter, sink,
	NULL);

	gst_element_link_many (src, q, overlay, capsfilter, sink, NULL);

	count = 0;

	gst_element_set_state (pipeline, GST_STATE_PLAYING);

	gst_bus_add_watch (GST_ELEMENT_BUS (pipeline), bus_cb, main_loop);

	g_main_loop_run (main_loop);

	gst_element_set_state (pipeline, GST_STATE_NULL);
	gst_object_unref (pipeline);
	g_object_unref (logo_pixbuf);

	return 0;
	}