Camerabin - how to specify size of image for capture
Thiago Santos
thiago.sousa.santos at collabora.com
Mon Feb 17 05:00:53 PST 2014
On 02/16/2014 11:34 AM, Ian Davidson wrote:
> I have upgraded my computer to use Fedora 20 and have the 1.2.3
> version of gstreamer installed. My program (below) still crashes with
> a 'not negotiated' if I try to specify the image size.
>
> Would the fixes that were pushed to git on 30th January have made it
> into release 1.2.3?
Hi, those changes will only be available on the 1.3.x release series.
The 1.2.x series only contains bugfixes on top of the original 1.2.0
release. The changes required to fix camerabin were not considered
safe enough to make it into 1.2.x releases and will only go into
the next version: 1.3.1
If you want to use those bugfixes you can try using git master version
or backporting the relevant patches to a previous version suitable for you.
--
Regards,
Thiago
>
> Ian
>
> /* JustTheCamera.c */
>
> #include <gtk/gtk.h>
> #include <gst/gst.h>
> #include <glib.h>
>
>
>
>
> GtkWidget *startsnapbutton;
> GtkWidget *snapbutton;
> GtkWidget *stopsnapbutton;
>
>
> static GstElement *camPipeline;
> GstElement *cambin;
> GstBus *cambus;
> GMainLoop *camloop;
> guint cam_bus_watch_id;
>
>
>
> static gboolean
> bus_call (GstBus *bus,
> GstMessage *msg,
> gpointer data)
> {
> GMainLoop *loop = (GMainLoop *) data;
> switch (GST_MESSAGE_TYPE (msg)) {
>
> case GST_MESSAGE_EOS:
> g_print ("End of stream\n");
> g_main_loop_quit (loop);
> break;
>
> case GST_MESSAGE_ERROR: {
> gchar *debug;
> GError *error;
>
> gst_message_parse_error (msg, &error, &debug);
> g_free (debug);
>
> g_printerr ("Error: %s\n", error->message);
> g_error_free (error);
>
> g_main_loop_quit (loop);
> break;
> }
>
> case GST_MESSAGE_APPLICATION:{
> const GstStructure *s;
>
> s = gst_message_get_structure (msg);
>
> if (gst_structure_has_name (s, "GstLaunchInterrupt")) {
> /* this application message is posted when we caught an interrupt and
> * we need to stop the pipeline. */
> g_print ("Interrupt: Stopping pipeline ...\n");
> /* gst_element_send_event (camPipeline, gst_event_new_eos ()); */
> gst_element_set_state (camPipeline, GST_STATE_NULL);
> g_main_loop_quit (loop);
> }
> break;
> }
> /* case GST_MESSAGE_STATE_CHANGED: {
> GstState old_state, new_state;
>
> gst_message_parse_state_changed (msg, &old_state, &new_state, NULL);
> g_print ("Element %s changed state from %s to %s.\n",
> GST_OBJECT_NAME (msg->src),
> gst_element_state_get_name (old_state),
> gst_element_state_get_name (new_state));
> break;
> } */
>
> default:
> break;
> }
>
> return TRUE;
> }
>
> gint delete_event( GtkWidget *widget,
> GdkEvent *event,
> gpointer data )
> {
> g_print ("Delete_Event called\n");
> return(FALSE);
> }
>
> /* Start the Camera - Set up camerabin. */
> void snapButtonPressed( GtkWidget *widget,
> gpointer data )
> {
>
> GstCaps *caps;
>
> gtk_widget_set_sensitive(startsnapbutton, FALSE);
> gtk_widget_set_sensitive(snapbutton, TRUE);
> gtk_widget_set_sensitive(stopsnapbutton, TRUE);
>
> camPipeline = gst_pipeline_new ("camera");
> cambin = gst_element_factory_make ("camerabin", "cambin1");
>
> camloop = g_main_loop_new (NULL, FALSE);
> if (!camPipeline || !cambin ) {
> g_printerr ("One element could not be created. Exiting.\n");
> return;
> }
> /* Set up the pipeline */
>
> g_print ("Watch for the bus\n");
> cambus = gst_pipeline_get_bus (GST_PIPELINE (camPipeline));
> cam_bus_watch_id = gst_bus_add_watch (cambus, bus_call, camloop);
>
> g_print ("Set the picture size\n");
> caps = gst_caps_from_string("video/x-raw, width=(int)800, height=(int)600");
> g_object_set (G_OBJECT (cambin), "image-capture-caps", caps, NULL);
> gst_caps_unref (caps); /* This unref seems to cause problems and may need to be commented out */
>
> g_print ("Add the element to the pipeline\n");
> gst_bin_add_many (GST_BIN (camPipeline), cambin, NULL);
>
>
> gst_element_set_state (camPipeline, GST_STATE_PLAYING);
>
> /* Iterate */
> g_main_loop_run (camloop);
>
>
> /* Out of the main loop, clean up nicely */
> g_print ("Returned, Camera Off\n");
> gst_element_set_state (camPipeline, GST_STATE_NULL);
>
> gst_object_unref (GST_OBJECT (camPipeline));
> g_source_remove (cam_bus_watch_id);
> g_main_loop_unref (camloop);
>
> gtk_main_quit();
>
> return;
>
> }
>
> void snapNow( GtkWidget *widget,
> gpointer data )
> {
> guint lbIdle;
>
> g_print ("Take a picture\n");
>
> g_object_get(cambin, "idle", &lbIdle, NULL);
> if (lbIdle) {
> g_print("Camera is Idle\n");
> } else {
> g_print("Camera is Busy\n");
> }
>
> g_signal_emit_by_name (cambin, "start-capture", NULL);
> }
>
>
> void snapOff( GtkWidget *widget,
> gpointer data )
> {
> g_print ("We want to stop\n");
>
> gst_element_post_message (GST_ELEMENT (camPipeline),
> gst_message_new_application (GST_OBJECT (camPipeline),
> gst_structure_new ("GstLaunchInterrupt",
> "message", G_TYPE_STRING, "Pipeline interrupted", NULL)));
> }
>
>
> int main( int argc,
> char *argv[] )
> {
> /* GtkWidget is the storage type for widgets */
> GtkWidget *window;
> GtkWidget *grid;
>
>
> /* This is called in all GTK applications. Arguments are parsed
> * from the command line and are returned to the application. */
> gtk_init (&argc, &argv);
> gst_init (&argc, &argv);
>
> /* Create a new window */
> window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
>
> gtk_window_set_title (GTK_WINDOW (window), "Camera");
>
> /* Here we just set a handler for delete_event that immediately
> * exits GTK. */
> g_signal_connect (window, "destroy",
> G_CALLBACK (delete_event), NULL);
>
> /* Sets the border width of the window. */
> gtk_container_set_border_width (GTK_CONTAINER (window), 10);
>
> /* Use a grid for the buttons */
> grid = gtk_grid_new();
>
> /* Put the grid into the main window. */
> gtk_container_add (GTK_CONTAINER (window), grid);
>
> /* Snapshot Buttons. */
> startsnapbutton = gtk_button_new_with_label ("Start Camera");
> g_signal_connect (startsnapbutton, "clicked",
> G_CALLBACK (snapButtonPressed), "Snapshot");
> gtk_grid_attach(GTK_GRID(grid), startsnapbutton, 0, 1, 1, 1);
> gtk_widget_show(startsnapbutton);
>
> snapbutton = gtk_button_new_with_label ("Take Snap");
> g_signal_connect (snapbutton, "clicked",
> G_CALLBACK (snapNow), "Snapshot");
> gtk_grid_attach(GTK_GRID(grid), snapbutton, 0, 2, 1, 1);
> gtk_widget_show(snapbutton);
> gtk_widget_set_sensitive(snapbutton, FALSE);
>
>
> stopsnapbutton = gtk_button_new_with_label ("Stop Camera");
> g_signal_connect (stopsnapbutton, "clicked",
> G_CALLBACK (snapOff), "Snapshot");
> gtk_grid_attach(GTK_GRID(grid), stopsnapbutton, 0, 3, 1, 1);
> gtk_widget_show(stopsnapbutton);
> gtk_widget_set_sensitive(stopsnapbutton, FALSE);
>
>
> gtk_widget_show(grid);
>
>
>
> gtk_widget_show (window);
>
> /* Rest in gtk_main and wait for the fun to begin! */
> gtk_main ();
>
> return(0);
> }
> /* JustTheCamera-end */
>
> trace.txt
>
>
> Watch for the bus
> Set the picture size
> Add the element to the pipeline
> Returned, Camera Off
> 33m 2444[00m 0x92ec060 [32;01mFIXME [00m [00;04m default gstutils.c:3648:gst_pad_create_stream_id_printf_valist:<preview-appsrc:src>[00m Creating random stream-id, consider implementing a deterministic way of creating a stream-id
> 0:00:04.719934133 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00;01;31;41m GST_PADS gstpad.c:3669:gst_pad_peer_query:<src-capsfilter:src>[00m could not send sticky events
> 0:00:04.999635762 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basetransform gstbasetransform.c:1373:gst_base_transform_setcaps:<src-videoconvert>[00m transform could not transform video/x-raw, format=(string)I420, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)100/1 in anything we support
> 0:00:05.000725976 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basetransform gstbasetransform.c:2115:gst_base_transform_handle_buffer:<src-videoconvert>[00m warning: not negotiated
> 0:00:05.000787104 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basetransform gstbasetransform.c:2115:gst_base_transform_handle_buffer:<src-videoconvert>[00m warning: not negotiated
> 0:00:05.001194337 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m bufferpool gstbufferpool.c:632:gst_buffer_pool_set_config:<v4l2bufferpool0>[00m can't change config, we are active
> 0:00:05.001261875 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m bufferpool gstbufferpool.c:632:gst_buffer_pool_set_config:<v4l2bufferpool0>[00m can't change config, we are active
> 0:00:05.117358001 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basetransform gstbasetransform.c:1373:gst_base_transform_setcaps:<src-capsfilter>[00m transform could not transform video/x-raw, format=(string)I420, width=(int)352, height=(int)292, pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive, framerate=(fraction)100/1 in anything we support
> 0:00:05.117696734 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basetransform gstbasetransform.c:2115:gst_base_transform_handle_buffer:<src-capsfilter>[00m warning: not negotiated
> 0:00:05.117730388 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basetransform gstbasetransform.c:2115:gst_base_transform_handle_buffer:<src-capsfilter>[00m warning: not negotiated
> 0:00:05.118095014 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basesrc gstbasesrc.c:2865:gst_base_src_loop:<camerasrc-real-src-actual-src-v4l>[00m error: Internal data flow error.
> 0:00:05.118136171 [333m 2444[00m 0x92ebf80 [33;01mWARN [00m [00m basesrc gstbasesrc.c:2865:gst_base_src_loop:<camerasrc-real-src-actual-src-v4l>[00m error: streaming task paused, reason not-negotiated (-4)
> Error: Internal data flow error.
>
> On 31/01/2014 14:51, Thiago Santos wrote:
>> On 01/31/2014 05:15 AM, Ian Davidson wrote:
>>> To clarify - I have not used the git master before and I don't know
>>> the process.
>>
>> You will need to clone and build the gstreamer modules. Check the
>> developer instructions at http://gstreamer.freedesktop.org/dev/
>>
>> and use git to clone the modules you need, I'd recommend using a
>> gst-uninstalled setup so that you don't have to install the binaries
>> to your system. You can find instructions about it at the 'scripts'
>> dir on the core gstreamer module or at
>> http://cgit.freedesktop.org/gstreamer/gstreamer/tree/scripts, look
>> for gst-uninstalled and create-uninstalled-setup.sh
>>
>> Then you just need to build the modules from the uninstalled setup.
>> Build by running './autogen.sh' from the module, remember to check
>> the final output listing the plugins that are enabled and the ones
>> that aren't. If a plugin you need/want is disabled, check if its
>> build dependencies are installed on your system and run autogen.sh
>> again. Then just run make and it should build.
>>
>> If you have a sample application/script that shows the problem, you
>> can send it to the list for other devels to look if it is correctly
>> using camerabin.
>>
>> --
>> Thiago
>>
>>>
>>> On 30/01/2014 21:59, Ian Davidson wrote:
>>>> OK. What do I have to download from which website?
>>>>
>>>> Ian
>>>>
>>>>> Some fixes have been pushed to gstreamer core and -base that are
>>>>> related to camerabin issues (yesterday and today). Can you give it
>>>>> a try with latest git gstreamer?
>>>>>
>>>>> If it still doesn't work for you, can you provide a small sample
>>>>> application to reproduce the issue in a bug filled at
>>>>> https://bugzilla.gnome.org/enter_bug.cgi?product=GStreamer
>
>
>
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
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