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M MAHESHA-JRMP84

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Sent: Wednesday, August 27, 2008 8:35 PM
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Subject: gstreamer-devel Digest, Vol 27, Issue 61

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Today's Topics:

1. Re: Fwd: Video processing (Stefan Kost)
2. Re: gst-ffmpeg plugin error (Sameer Naik)
3. Re: Fwd: Video processing (Olivier Aubert)
4. problem compiling gstreamer 0.10.20 (Albert Costa)

----------------------------------------------------------------------

Message: 1
Date: Wed, 27 Aug 2008 16:51:24 +0300
From: Stefan Kost <[hidden email]>
Subject: Re: [gst-devel] Fwd: Video processing
To: Discussion of the development of GStreamer
<[hidden email]>
Message-ID: <[hidden email]>
Content-Type: text/plain; charset=ISO-8859-1

hi,

you can directly draw on the xvideo drawable. set autopaint-colorkey=FALSE on xvimagesink and read out the colorkey from that property. Then you can have to paint the drawable with the colorkey. The video will shine-thru on areas painted with the color key.
If you paint a rect-angle of a different color it will be over the video.
This needs latest gst-plugins-base (maybe even cvs). Check if your xvimagsink has those properties.

Stefan

Bruno schrieb:

> Yep that is what I was doing before. Do you think I can draw
> rectangles over the cam image when using xvimagesink ?
>
>
> 2008/8/26, Eric Zhang <[hidden email]
> <mailto:[hidden email]>>:
>
> Hi, gstreamer-devel:
>
> If you only want to `ximagesink' or `xvimagesink' draws images in
> your GtkDrawingArea, there is a very simple way to achieve this:
>
> Just connect the `expose-event' signal of GtkDrawingArea and pass
> the window ID to the sink element:
>
> // Drawing on our drawing area
> g_signal_connect(G_OBJECT(area), "expose-event",
> G_CALLBACK(expose_cb),
> NULL);
>
> /* Callback to be called when the drawing area is exposed */
>
> static gboolean expose_cb(GtkWidget * widget, GdkEventExpose * event,
> gpointer data)
> {
>
> // `play-videosink' is your video sink element
> gst_x_overlay_set_xwindow_id(GST_X_OVERLAY(play->videosink),
>
> GDK_WINDOW_XWINDOW(widget->window));
> return FALSE;
> }
>
>
> That's it. If you want to draw the image yourself while not using
> `xvimagesink' or `ximagesink', then I think this is a Gtk+
> problem, not
> a gstreamer issue.
>
>
> Eric Zhang
>
>
>
>
> Bruno wrote:
> > Hello all,
> >
> > I still have some questions about gstreamer.
> >
> > Actually I'd like to change the way my program work, in order to
> > display a frame from the camera only once the image processing has
> > been done, and with a rectangle over the face of the person.
> >
> > So I changed my pipeline (removed the screen_sink element), and I'd
> > like to send a buffer from my image processing function to the gtk
> > drawing area where the camera image was displayed before. I tried to
> > do it with gtk drawing area (and with gtk image too with no sucess),
> > but I can't find the way to change the image contained in the drawing
> > area.
> >
> > Here is my code :
> >
> >
> >
> > ///// IMAGE PROCESSING CALLBACK
> >
> > /* Callback to be called when data goes through the pad */
> > static gboolean process_frame(GstElement *video_sink,
> > GstBuffer *buffer, GstPad *pad, AppData *appdata)
> > {
> > int x, y;
> > // getting the pointer to camera buffer
> > unsigned char *data_photo = (unsigned char *)
> > GST_BUFFER_DATA(buffer);
> >
> >
> > // REMOVED PART WHERE THE COORDINATES OF THE POSITION OF THE FACE IS
> > CALCULATED //
> >
> >
> > // THIS PART IS WHAT I TRIED, BUT I HAVE A SEGMENTATION FAULT WHEN
> > CREATING PIXBUF //
> > GdkPixbuf *newscreen;
> > //newscreen = gdk_pixbuf_new_from_data(data_photo,
> > //GDK_COLORSPACE_RGB, /* RGB-colorspace */
> > //FALSE, /* No alpha-channel */
> > //8, /* Bits per RGB-component */
> > //IMAGE_WIDTH, IMAGE_HEIGHT, /* Dimensions */
> > //3*IMAGE_WIDTH, /* Number of bytes between lines
> > (ie stride) */
> > //NULL, NULL); /* Callbacks */
> >
> >
> > gdk_draw_pixmap(GDK_DRAWABLE(appdata->screen),
> > appdata->screen->style->black_gc, GDK_DRAWABLE(newscreen), 0, 0,
> 0, 0,
> > -1, -1);
> >
> > return TRUE;
> > }
> >
> >
> >
> >
> >
> > /////// PIPELINE
> >
> >
> > /* Initialize the the Gstreamer pipeline. Below is a diagram
> > * of the pipeline that will be created:
> > *
> > * |Camera| |CSP | |Screen| |Screen| |Image |
> > * |src |->|Filter|->|queue |->|sink |-> |processing|-> Display
> > */
> > static gboolean initialize_pipeline(AppData *appdata,
> > int *argc, char ***argv)
> > {
> > GstElement *pipeline, *camera_src, *screen_sink;
> > GstElement *screen_queue;
> > GstElement *csp_filter;
> > GstCaps *caps;
> > GstBus *bus;
> > GstPad *sinkpad;
> >
> > /* Initialize Gstreamer */
> > gst_init(argc, argv);
> >
> > /* Create pipeline and attach a callback to it's
> > * message bus */
> > pipeline = gst_pipeline_new("test-camera");
> >
> > bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
> > gst_bus_add_watch(bus, (GstBusFunc)bus_callback, appdata);
> > gst_object_unref(GST_OBJECT(bus));
> >
> > /* Save pipeline to the AppData structure */
> > appdata->pipeline = pipeline;
> >
> > /* Create elements */
> > /* Camera video stream comes from a Video4Linux driver */
> > camera_src = gst_element_factory_make(VIDEO_SRC, "camera_src");
> > /* Colorspace filter is needed to make sure that sinks
> understands
> > * the stream coming from the camera */
> > csp_filter = gst_element_factory_make("ffmpegcolorspace",
> > "csp_filter");
> > /* Queue creates new thread for the stream */
> > screen_queue = gst_element_factory_make("queue", "screen_queue");
> > /* Sink that shows the image on screen. Xephyr doesn't
> support XVideo
> > * extension, so it needs to use ximagesink, but the device uses
> > * xvimagesink */
> > //screen_sink = gst_element_factory_make(VIDEO_SINK,
> "screen_sink");
> >
> > sinkpad = gst_element_get_static_pad(screen_queue,"sink");
> > gst_pad_add_buffer_probe(sinkpad,G_CALLBACK(process_frame),
> appdata);
> >
> >
> > /* Check that elements are correctly initialized */
> > if(!(pipeline && camera_src /*&& screen_sink*/ && csp_filter &&
> > screen_queue))
> > {
> > g_critical("Couldn't create pipeline elements");
> > return FALSE;
> > }
> >
> >
> > /* Add elements to the pipeline. This has to be done prior to
> > * linking them */
> > gst_bin_add_many(GST_BIN(pipeline), camera_src, csp_filter,
> > screen_queue, /*screen_sink,*/ NULL);
> >
> > /* Specify what kind of video is wanted from the camera */
> > caps = gst_caps_new_simple("video/x-raw-rgb",
> > "width", G_TYPE_INT, IMAGE_WIDTH,
> > "height", G_TYPE_INT, IMAGE_HEIGHT,
> > "framerate", GST_TYPE_FRACTION, FRAMERATE, 1,
> > NULL);
> >
> >
> > /* Link the camera source and colorspace filter using
> capabilities
> > * specified */
> > if(!gst_element_link_filtered(camera_src, csp_filter, caps))
> > {
> > return FALSE;
> > }
> > gst_caps_unref(caps);
> >
> > /* Connect Colorspace Filter -> Screen Queue -> Screen Sink
> > * This finalizes the initialization of the screen-part of the
> > pipeline */
> > if(!gst_element_link_many(csp_filter, screen_queue,
> /*screen_sink,
> > */NULL))
> > {
> > return FALSE;
> > }
> >
> > gst_element_set_state(pipeline, GST_STATE_PAUSED);
> >
> > return TRUE;
> > }
> >
> >
> >
> >
> >
> >
> >
> > /////// MAIN FUNCTION
> >
> >
> > int main(int argc, char **argv)
> > {
> > // variables for face detection
> > // main structure for vjdetect
> >
> > pdata = (mainstruct*) calloc(1, sizeof(mainstruct));
> > // Allocate memory for array of face detections returned by
> > facedetector (VjDetect).
> > pdata->pFaceDetections = (FLY_Rect
> > *)calloc(MAX_NUMBER_OF_FACE_DETECTIONS, sizeof(FLY_Rect));
> > init(pdata);
> >
> > AppData appdata;
> > appdata.expression = 0;
> > GtkWidget *hbox, *vbox_button, *vbox, *button1, *button2;
> >
> >
> > /* Initialize and create the GUI */
> >
> > example_gui_initialize(
> > &appdata.program, &appdata.window,
> > &argc, &argv, "Expression Detector");
> >
> > vbox = gtk_vbox_new(FALSE, 0);
> > hbox = gtk_hbox_new(FALSE, 0);
> > vbox_button = gtk_vbox_new(FALSE, 0);
> >
> > gtk_box_pack_start(GTK_BOX(hbox), vbox, FALSE, FALSE, 0);
> > gtk_box_pack_start(GTK_BOX(hbox), vbox_button, FALSE, FALSE, 0);
> >
> > appdata.screen = gtk_drawing_area_new();
> > gtk_widget_set_size_request(appdata.screen, 500, 380);
> > gtk_box_pack_start(GTK_BOX(vbox), appdata.screen, FALSE,
> FALSE, 0);
> >
> > button1 = gtk_toggle_button_new_with_label("Run/Stop");
> > gtk_widget_set_size_request(button1, 170, 75);
> > gtk_box_pack_start(GTK_BOX(vbox_button), button1, FALSE,
> FALSE, 0);
> >
> > button2 = gtk_toggle_button_new_with_label("Expressions ON/OFF");
> > gtk_widget_set_size_request(button2, 170, 75);
> > gtk_box_pack_start(GTK_BOX(vbox_button), button2, FALSE,
> FALSE, 0);
> >
> >
> > appdata.anger = gtk_image_new_from_file("./smileys/anger.jpg");
> > gtk_widget_set_size_request(appdata.anger, 160, 180);
> > appdata.disgust =
> gtk_image_new_from_file("./smileys/disgust.jpg");
> > gtk_widget_set_size_request(appdata.disgust, 160, 180);
> > appdata.fear = gtk_image_new_from_file("./smileys/fear.jpg");
> > gtk_widget_set_size_request(appdata.fear, 160, 180);
> > appdata.happy = gtk_image_new_from_file("./smileys/happy.jpg");
> > gtk_widget_set_size_request(appdata.happy, 160, 180);
> > appdata.neutral =
> gtk_image_new_from_file("./smileys/neutral.jpg");
> > gtk_widget_set_size_request(appdata.neutral, 160, 180);
> > appdata.sad = gtk_image_new_from_file("./smileys/sad.jpg");
> > gtk_widget_set_size_request(appdata.sad, 160, 180);
> > appdata.surprise =
> gtk_image_new_from_file("./smileys/surprise.jpg");
> > gtk_widget_set_size_request(appdata.surprise, 160, 180);
> > appdata.unknown =
> gtk_image_new_from_file("./smileys/unknown.jpg");
> > gtk_widget_set_size_request(appdata.unknown, 160, 180);
> >
> > appdata.smiley =
> gtk_image_new_from_file("./smileys/unknown.jpg");
> > gtk_widget_set_size_request(appdata.smiley, 160, 180);
> > gtk_box_pack_start(GTK_BOX(vbox_button), appdata.smiley, FALSE,
> > FALSE, 0);
> >
> > g_signal_connect(G_OBJECT(button1), "clicked",
> > G_CALLBACK(button1_pressed), &appdata);
> >
> > g_signal_connect(G_OBJECT(button2), "clicked",
> > G_CALLBACK(button2_pressed), &appdata);
> >
> >
> > gtk_container_add(GTK_CONTAINER(appdata.window), hbox);
> >
> > /* Initialize the GTK pipeline */
> > if(!initialize_pipeline(&appdata, &argc, &argv))
> > {
> > hildon_banner_show_information(
> > GTK_WIDGET(appdata.window),
> > "gtk-dialog-error",
> > "Failed to initialize pipeline");
> > }
> >
> >
> >
> > g_signal_connect(G_OBJECT(appdata.window), "destroy",
> > G_CALLBACK(destroy_pipeline), &appdata);
> >
> >
> > /* Begin the main application */
> > example_gui_run(appdata.program, appdata.window);
> >
> > /* Free the gstreamer resources. Elements added
> > * to the pipeline will be freed automatically */
> >
> > return 0;
> > }
> >
> >
> > What I'd like to do is to modify the data_photo buffer to draw a
> > rectangle in it (in the process_frame function), and draw the content
> > in the appdata.screen GtkWidget. (by the way screen is declared as a
> > GtkWidget * in the appdata structure).
> >
> > Thanks in advance for your help !
> > Bruno
> >
>
> >
> ----------------------------------------------------------------------
> --
>
> >
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------------------------------

Message: 2
Date: Wed, 27 Aug 2008 19:37:54 +0530
From: "Sameer Naik" <[hidden email]>
Subject: Re: [gst-devel] gst-ffmpeg plugin error
To: "Discussion of the development of GStreamer"
<[hidden email]>
Message-ID:
<[hidden email]>
Content-Type: text/plain; charset="iso-8859-1"

i think this is because of seLinux policy settings.
if you can add the policies then do so, or you could also disable selinux entirely

Regards
Sameer

On Wed, Aug 27, 2008 at 6:01 PM, Sachin Pandhare
<[hidden email]>wrote:

> Hi,
> I always keep getting following error for any gstreamer related operation:
>
> ----------------------------------------------------------------------
> --------------------------------------
> [root@trng4 gst-ffmpeg-0.10.4]# gst-inspect | grep mpeg
> 0:00:00.043393511 25925 0x96f2050 WARN GST_PLUGIN_LOADING
> gstplugin.c:492:gst_plugin_load_file: module_open failed:
> /usr/lib/gstreamer-0.10/libgstpostproc.so: cannot restore segment prot
> after
> reloc: Permission denied
>
> (gst-inspect-0.10:25925): GStreamer-WARNING **: Failed to load plugin
> '/usr/lib/gstreamer-0.10/libgstpostproc.so':
> /usr/lib/gstreamer-0.10/libgstpostproc.so: cannot restore segment prot
> after
> reloc: Permission denied
> 0:00:00.059717888 25925 0x96f2050 WARN GST_PLUGIN_LOADING
> gstplugin.c:492:gst_plugin_load_file: module_open failed:
> /usr/lib/gstreamer-0.10/libgstffmpeg.so: cannot restore segment prot
> after
> reloc: Permission denied
>
> (gst-inspect-0.10:25925): GStreamer-WARNING **: Failed to load plugin
> '/usr/lib/gstreamer-0.10/libgstffmpeg.so':
> /usr/lib/gstreamer-0.10/libgstffmpeg.so: cannot restore segment prot
> after
> reloc: Permission denied
>
> ----------------------------------------------------------------------
> --------------------------------------
>
> how can i resolve this error?
>
> My setup:
> gstreamer-0.10.20
> gst-plugins-base-0.10.20
> gst-plugins-good-0.10.9
> gst-plugins-bad-0.10.8
> gst-plugins-ugly-0.10.8
> gst-ffmpeg-0.10.4
> liboil-0.3.15
>
> Fedora 8
>
> thanks,
> Sachin
>
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>

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Message: 3
Date: Wed, 27 Aug 2008 10:35:21 +0200
From: Olivier Aubert <[hidden email]>
Subject: Re: [gst-devel] Fwd: Video processing
To: Discussion of the development of GStreamer
<[hidden email]>
Message-ID: <1219826121.5807.29.camel@pennylane>
Content-Type: text/plain

Hi all

> Could you be a little more precise please ?
> How do I modify the buffer ? How do I draw it on the screen after ?
> should I still declare my screen widget from appdata struct as a
> drawing area ?
FYI, I am planning (do not know exactly when) to develop a svgoverlay plugin, which would allow to overlay a SVG content over a buffer, for the same kind of usage (drawing shapes over the video). I have already developped such a filter for vlc, and the structure of gstreamer should make it easy.

I have also tried another way (using videomixer and feeding it the output of gdkpixbufdec (which can decode SVG), but I did not manage
(yet) to make it work. I have tried variations around the following
pipeline:

videotestsrc ! video/x-raw-yuv,width=320, height=240 ! videomixer name=mix ! ffmpegcolorspace ! xvimagesink filesrc location=/tmp/a.svg !
gdkpixbufdec ! videoscale ! video/x-raw-rgb,width=320,height=240 !
ffmpegcolorspace ! alpha alpha=0.5 ! mix.

Olivier

------------------------------

Message: 4
Date: Wed, 27 Aug 2008 15:05:04 +0000 (GMT)
From: Albert Costa <[hidden email]>
Subject: [gst-devel] problem compiling gstreamer 0.10.20
To: gstreamer <[hidden email]>
Message-ID: <[hidden email]>
Content-Type: text/plain; charset="utf-8"

Hi,
I have retrieved the sources of gstreamer 0.10.20; but when trying to compile it (under win32), I end up with errors, one beeing "..\..\gst\gstquery.c(1126) : error C2065: 'GST_TYPE_BUFFERING_MODE, undefined identifier".. I have looked for that symbol in the whole gstreamer directory, couldn't find it anywhere. Am I missing something that I didn't downloaded right? Or any settings that I forgot to set? (It was all compiling fine with 0.10.19....) Regards, Al

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