subprojects/gst-plugins-base/tests/interactive/test-overlay-blending.c - gstreamer - Git at Google


            
            /* GStreamer video overlay composition blending 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 <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 GstBuffer *logo_buf;


            static GMainLoop *main_loop;

            
            static gint count;


            static GstBuffer *

            
            create_overlay_buffer (void)

            
            {

            
              GZlibDecompressor *decompress;

            
              GConverterResult decomp_res;

            
              guchar *gzipped_pixdata, *pixdata;

            
              gsize gzipped_size, bytes_read, pixdata_size;

            
              GstBuffer *logo_pixels;

            
              guint w, h, stride;


              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);


              /* 4: length incl. header */

            
              /* 8: pixdata_type */

            
              /* 12: rowstride (900) */

            
              stride = GST_READ_UINT32_BE (pixdata + 12);

            
              /* 16: width (225) */

            
              w = GST_READ_UINT32_BE (pixdata + 16);

            
              /* 20: height (57) */

            
              h = GST_READ_UINT32_BE (pixdata + 20);

            
              /* 24: pixel_data */

            
              GST_LOG ("%dx%d @ %d", w, h, stride);

            
              /* we assume that the last line also has padding at the end */

            
              g_assert (pixdata_size - 24 >= h * stride);


              logo_pixels = gst_buffer_new_and_alloc (h * stride);

            
              gst_buffer_fill (logo_pixels, 0, pixdata + 24, h * stride);

            
              gst_buffer_add_video_meta (logo_pixels, GST_VIDEO_FRAME_FLAG_NONE,

            
                  GST_VIDEO_OVERLAY_COMPOSITION_FORMAT_RGB, w, h);


              g_free (pixdata);


              return logo_pixels;

            
            }


            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_error_free (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)

            
            {

            
              GstVideoOverlayRectangle *rect;

            
              GstVideoOverlayComposition *comp;

            
              GstVideoFrame frame;

            
              GstVideoMeta *vmeta;

            
              GstVideoInfo vinfo;

            
              GstCaps *caps;

            
              gint x, y;


              caps = gst_pad_get_current_caps (pad);

            
              gst_video_info_from_caps (&vinfo, caps);

            
              gst_caps_unref (caps);


              info->data = gst_buffer_make_writable (info->data);


              vmeta = gst_buffer_get_video_meta (logo_buf);


              calculate_position (&x, &y, vmeta->width, vmeta->height, ++count);


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


              rect = gst_video_overlay_rectangle_new_raw (logo_buf, x, y,

            
                  vmeta->width, vmeta->height, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);

            
              comp = gst_video_overlay_composition_new (rect);

            
              gst_video_overlay_rectangle_unref (rect);


              gst_video_frame_map (&frame, &vinfo, info->data, GST_MAP_READWRITE);


              if (!gst_video_overlay_composition_blend (comp, &frame))

            
                g_warning ("Error blending overlay at position (%d,%d)", x, y);


              gst_video_frame_unmap (&frame);


              gst_video_overlay_composition_unref (comp);


              return GST_PAD_PROBE_OK;

            
            }


            int

            
            main (int argc, char **argv)

            
            {

            
              GOptionEntry options[] = {

            
                {NULL}

            
              };

            
              GOptionContext *ctx;

            
              GError *err = NULL;

            
              GstElement *src, *q, *capsfilter, *sink;

            
              GstElement *pipeline;

            
              GstPad *src_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);

            
                return 1;

            
              }

            
              g_option_context_free (ctx);


              logo_buf = create_overlay_buffer ();


              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");


              src_pad = gst_element_get_static_pad (src, "src");

            
              gst_pad_add_probe (src_pad, GST_PAD_PROBE_TYPE_BUFFER, buffer_cb,

            
                  main_loop, NULL);

            
              gst_object_unref (src_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, capsfilter, sink, NULL);


              gst_element_link_many (src, q, 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);

            
              gst_buffer_unref (logo_buf);


              return 0;

            
            }
	/* GStreamer video overlay composition blending 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 <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"
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	static GstBuffer *logo_buf;

	static GMainLoop *main_loop;
	static gint count;

	static GstBuffer *
	create_overlay_buffer (void)
	{
	GZlibDecompressor *decompress;
	GConverterResult decomp_res;
	guchar gzipped_pixdata, pixdata;
	gsize gzipped_size, bytes_read, pixdata_size;
	GstBuffer *logo_pixels;
	guint w, h, stride;

	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);

	/* 4: length incl. header */
	/* 8: pixdata_type */
	/* 12: rowstride (900) */
	stride = GST_READ_UINT32_BE (pixdata + 12);
	/* 16: width (225) */
	w = GST_READ_UINT32_BE (pixdata + 16);
	/* 20: height (57) */
	h = GST_READ_UINT32_BE (pixdata + 20);
	/* 24: pixel_data */
	GST_LOG ("%dx%d @ %d", w, h, stride);
	/* we assume that the last line also has padding at the end */
	g_assert (pixdata_size - 24 >= h * stride);

	logo_pixels = gst_buffer_new_and_alloc (h * stride);
	gst_buffer_fill (logo_pixels, 0, pixdata + 24, h * stride);
	gst_buffer_add_video_meta (logo_pixels, GST_VIDEO_FRAME_FLAG_NONE,
	GST_VIDEO_OVERLAY_COMPOSITION_FORMAT_RGB, w, h);

	g_free (pixdata);

	return logo_pixels;
	}

	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_error_free (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)
	{
	GstVideoOverlayRectangle *rect;
	GstVideoOverlayComposition *comp;
	GstVideoFrame frame;
	GstVideoMeta *vmeta;
	GstVideoInfo vinfo;
	GstCaps *caps;
	gint x, y;

	caps = gst_pad_get_current_caps (pad);
	gst_video_info_from_caps (&vinfo, caps);
	gst_caps_unref (caps);

	info->data = gst_buffer_make_writable (info->data);

	vmeta = gst_buffer_get_video_meta (logo_buf);

	calculate_position (&x, &y, vmeta->width, vmeta->height, ++count);

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

	rect = gst_video_overlay_rectangle_new_raw (logo_buf, x, y,
	vmeta->width, vmeta->height, GST_VIDEO_OVERLAY_FORMAT_FLAG_NONE);
	comp = gst_video_overlay_composition_new (rect);
	gst_video_overlay_rectangle_unref (rect);

	gst_video_frame_map (&frame, &vinfo, info->data, GST_MAP_READWRITE);

	if (!gst_video_overlay_composition_blend (comp, &frame))
	g_warning ("Error blending overlay at position (%d,%d)", x, y);

	gst_video_frame_unmap (&frame);

	gst_video_overlay_composition_unref (comp);

	return GST_PAD_PROBE_OK;
	}

	int
	main (int argc, char **argv)
	{
	GOptionEntry options[] = {
	{NULL}
	};
	GOptionContext *ctx;
	GError *err = NULL;
	GstElement src, q, capsfilter, sink;
	GstElement *pipeline;
	GstPad *src_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);
	return 1;
	}
	g_option_context_free (ctx);

	logo_buf = create_overlay_buffer ();

	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");

	src_pad = gst_element_get_static_pad (src, "src");
	gst_pad_add_probe (src_pad, GST_PAD_PROBE_TYPE_BUFFER, buffer_cb,
	main_loop, NULL);
	gst_object_unref (src_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, capsfilter, sink, NULL);

	gst_element_link_many (src, q, 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);
	gst_buffer_unref (logo_buf);

	return 0;
	}