gst_controller_new returns NULL
Rossana Guerra
guerra.rossana at gmail.com
Tue Oct 25 12:15:40 PDT 2011
Well I did the following change and it doesn't work, with the right propery
it couldn't create the controller either. I am clueless.
if (!(ctrl = gst_controller_new (G_OBJECT(smpte), "property",NULL)))
{
cout << "ctrl vale..." << ctrl << endl;
cout << "no pudo crear controlador..." << endl;
GST_WARNING ("No puede controlar el elemento fuente\n");
return 1;
}
2011/10/25 Rossana Guerra <guerra.rossana at gmail.com>
> Thanks Stefan, as I understand, now I have to control the "position"
> property.
>
> I run an the following example, where I control the "alpha" property, and
> it works fine. I don't know if it's due a different pipeline, but it doesn't
> concern about "alpha" property.
> Here's the code which runs (without sound):
>
>
> #include <gst.h>
> #include <controller/gstcontroller.h>
>
> #include <iostream>
>
> using namespace std;
>
>
> // Manejador de errores
> static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data)
> {
> :::::::::::::::
> }
>
> static void on_pad_added (GstElement *element, GstPad *pad, gpointer data)
> {
> GstPad *sinkpad = NULL;
> GstElement * queue = (GstElement *) data;
>
>
> /* Ahora linkeo el pad de comp con sink pad */
> g_print ("Dynamic pad created, linking queue\n");
> sinkpad = gst_element_get_static_pad (queue, "sink");
>
>
> gst_pad_link (pad, sinkpad);
>
> gst_object_unref (sinkpad);
>
> }
>
> GstElement * getBin(const gchar * nomBin, GstElement * &alfa1, GstElement
> *&smpte, GstElement * &color, gint transicion = 1)
> {
>
> GstElement * bin = gst_bin_new(nomBin);
>
> if (!bin)
> {
> g_printerr ("No se pudo crear el bin. Saliendo\n");
> return NULL;
>
> }
>
> alfa1 = gst_element_factory_make ("alpha","alfa1");
> smpte = gst_element_factory_make ("smptealpha","smpte");
> color = gst_element_factory_make ("ffmpegcolorspace", "color");
> GstElement * mixer = gst_element_factory_make("videomixer", "mixer");
>
>
> if ((!alfa1) || (!smpte) || (!color) || (!mixer))
> {
> g_printerr ("Alguno de los elementos del Bin no pudo ser creado.
> Saliendo\n");
> return NULL;
> }
>
> // Anexamos al bin
> gst_bin_add_many(GST_BIN (bin),alfa1,smpte,mixer,color,NULL);
>
> // Enlazamos elementos
> gst_element_link (alfa1, mixer);
> gst_element_link (smpte, mixer);
> gst_element_link (mixer,color);
>
>
> g_object_set(smpte,"type", transicion, NULL);
>
> return bin;
> }
>
> void getAndSetController(GstElement * smpte, gdouble duracion)
>
> {
> GstController * ctrl = NULL;
> if (!(ctrl = gst_controller_new (G_OBJECT (smpte), "alpha",NULL))) {
> // Here it works fine
>
> GST_WARNING ("No puede controlar el elemento fuente\n");
> return;
>
> }
>
> // Todo valor GValue debe inicializarse en 0
> GValue val_double = { 0, };
> g_value_init (&val_double, G_TYPE_DOUBLE);
>
>
> // Creo la fuente al controlador y la asocio al controlador
> // Seteo modo de interpolacion
>
> GstInterpolationControlSource * csource =
> gst_interpolation_control_source_new();
> gst_controller_set_control_source (ctrl, "alpha", GST_CONTROL_SOURCE
> (csource));
>
>
> gst_interpolation_control_source_set_interpolation_mode(csource,GST_INTERPOLATE_LINEAR);
>
> // Seteo primer valor
> g_value_set_double(&val_double, 0.0);
> gst_interpolation_control_source_set(csource,(0 *
> GST_MSECOND),&val_double);
>
> // Seteo segundo valor
> g_value_set_double (&val_double, duracion);
> gst_interpolation_control_source_set(csource,(1 *
> GST_MSECOND),&val_double);
>
>
> g_object_unref (csource);
>
> }
>
> void addGhostPadsToBin(GstElement *alfa1, GstElement * smpte, GstElement *
> color, GstElement* bin)
> {
> /* add ghostpad */
> GstPad * pad1 = gst_element_get_static_pad (alfa1, "sink");
> gst_element_add_pad(bin, gst_ghost_pad_new("alfasink1", pad1));
> gst_object_unref (GST_OBJECT (pad1));
>
> GstPad * pad2 = gst_element_get_static_pad (smpte, "sink");
> gst_element_add_pad(bin, gst_ghost_pad_new("alfasink2", pad2));
> gst_object_unref(GST_OBJECT(pad2));
>
> GstPad * pad3 = gst_element_get_static_pad (color, "src");
> gst_element_add_pad(bin, gst_ghost_pad_new("colorsrc", pad3));
> gst_object_unref(GST_OBJECT(pad3));
>
> }
>
> void crossTransicion(gdouble duracion, GstElement * & bin,gint transicion =
> 1)
> {
> // devuelve el bin
> GstElement * alfa1, *smpte, *color;
> alfa1 = 0;
> smpte = 0;
> color = 0;
>
> bin = getBin("bin",alfa1, smpte,color,transicion); // Crea el bin y
> los elementos
>
> getAndSetController(smpte,duracion);
>
> addGhostPadsToBin(alfa1, smpte, color, bin);
>
> }
>
> GstElement * getSetPipeline(gchar *argv[])
> {
> gint dur1 = 9000; // duration (in ms) to play of first clip
> gint dur2 = 8000; // duration (in ms) to play of second clip
> gint dur_crossfade = 500; //number of milliseconds to crossfade for
> GstElement *comp = 0;
> GstElement *pipeline, *video1, *video2, *op, *bin, *queue, *sink;
>
> // ejecuta 2 clips serialmente con un crosdfade entre ellos usando el
> elemento (GnlOlin) gnlcomposition
> if ((comp = gst_element_factory_make("gnlcomposition",
> "micomposicion")) == NULL)
> {
> printf ("\n Fallo al crear gnlcomposition \n");
> return NULL;
> }
>
> op = gst_element_factory_make("gnloperation", "op");
>
> crossTransicion(dur_crossfade, bin,1);
>
> if (gst_bin_add (GST_BIN (op), bin) == FALSE)
> {
> printf ("\n No pudo agregar el bin a la gnloperacion op \n");
> return NULL;
> }
>
> g_object_set (op,"start", (dur1-dur_crossfade) * GST_MSECOND,NULL);
> g_object_set (op,"duration", dur_crossfade * GST_MSECOND,NULL);
> g_object_set (op,"media-start", 0 * GST_MSECOND,NULL);
> g_object_set(op,"media-duration", dur_crossfade * GST_MSECOND,NULL);
> g_object_set(op,"priority",0,NULL);
>
> if (gst_bin_add (GST_BIN (comp), op) == FALSE)
> {
> printf ("\n No pudo agregar la gnloperacion a la gnlcomposition \n");
> return NULL;
> }
>
>
> // configura primer clip
>
> if ((video1 = gst_element_factory_make("gnlfilesource", "video1")) ==
> NULL)
> {
> printf ("\n Falló la creacion del gnlfilesource \n");
> return NULL;
> }
> if (gst_bin_add (GST_BIN (comp), video1) == FALSE)
> {
> printf ("\n No pudo agregar video1 a comp \n");
> return NULL;
> }
>
> g_object_set (video1, "location", argv[1], NULL);
> g_object_set(video1, "uri", argv[1],NULL);
> g_object_set (video1, "start", 0 * GST_MSECOND, NULL);
> g_object_set (video1, "duration", dur1 * GST_MSECOND, NULL);
> g_object_set (video1, "media-start", 0* GST_MSECOND, NULL);
> g_object_set (video1, "media-duration", dur1 * GST_MSECOND, NULL);
> g_object_set (video1, "priority", 1,NULL);
>
> // crea 2º clip
> if ((video2 = gst_element_factory_make("gnlfilesource", "video2")) ==
> NULL)
> {
> printf ("\n Falló la creacion del gnlfilesource \n");
> return NULL;
> }
>
>
> if (gst_bin_add (GST_BIN (comp), video2) == FALSE)
> {
> printf ("\n No pudo agregar video2 a comp \n");
> return NULL;
> }
>
> g_object_set (video2, "location", argv[2], NULL);
> g_object_set (video2,"uri",argv[2],NULL);
> g_object_set (video2, "start", (dur1-dur_crossfade) * GST_MSECOND,
> NULL);
> g_object_set (video2, "duration", dur2 * GST_MSECOND, NULL);
> g_object_set (video2, "media-start", 0 * GST_MSECOND, NULL);
> g_object_set (video2, "media-duration", dur2 * GST_MSECOND, NULL);
> g_object_set (video2, "priority", 2,NULL);
>
> // setup the backend viewer
>
> queue = gst_element_factory_make("queue", "queue");
> sink = gst_element_factory_make("autovideosink", "sink");
>
> pipeline = gst_pipeline_new ("video-player");
>
> /* Agrego elementos al pipeline */
>
> gst_bin_add_many (GST_BIN (pipeline),comp, queue, sink, NULL);
>
> g_signal_connect (comp, "pad-added", G_CALLBACK (on_pad_added),queue);
>
> gst_element_link (queue, sink);
>
> return pipeline;
>
> }
>
> void startPlay(GstElement * pip)
> {
> /* Set the pipeline to "playing" state*/
> gst_element_set_state (pip, GST_STATE_PLAYING);
>
> }
>
>
> int main(gint argc, gchar *argv[])
> {
> GMainLoop *loop = NULL;
>
> /* init GStreamer */
> gst_init (&argc, &argv);
> gst_controller_init (&argc, &argv);
>
> loop = g_main_loop_new (NULL, FALSE);
>
> /* chequeamos sintaxis */
> if (argc != 3)
> {
> g_print ("Uso: %s <URI1> <URI2>\n", argv[0]);
> return -1;
> }
>
> GstElement * play = getSetPipeline(argv);
>
>
> GstBus *bus2 = gst_pipeline_get_bus (GST_PIPELINE (play));
> gst_bus_add_watch (bus2, bus_call, loop);
> gst_object_unref (bus2);
>
> cout << "...PLAY" << endl;
>
> startPlay(play);
>
> /* now run */
>
> g_main_loop_run (loop);
>
> /* also clean up */
> gst_element_set_state (play, GST_STATE_NULL);
> gst_object_unref (GST_OBJECT (play));
> return 0;
>
> }
>
>
>
>
>
> 2011/10/25 Stefan Sauer <ensonic at hora-obscura.de>
>
>> **
>> On 10/25/2011 08:06 AM, Rossana Guerra wrote:
>>
>> Hello everyone, I am translating the following code to C/C++:
>> http://notes.brooks.nu/2011/01/python-gstreamer-controller/
>> It's a controller for controlling the alpha channel during crossfade, I
>> adapted it for transitions, using, smpte instead.
>>
>>
>> smptealpha does not have a property called "alpha". Only "border" and
>> "invert" are controllable right now.
>>
>> Stefan
>>
>>
>> The fact is it returns NULL and the programs stop running. The code is
>> below, I appreciate any suggestion.
>> I am a bit clueless is an adaptation of a code I did before and it works.
>>
>> Thanks and regards.
>>
>> Rossana
>>
>> //// the code
>>
>> #include <gst.h>
>> #include <controller/gstcontroller.h>
>>
>> #include <iostream>
>>
>>
>> using namespace std;
>>
>> // Manejador de errores
>> static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data)
>> {
>> ::::::::::::::::::::::::................
>> }
>>
>> static void on_pad_added (GstElement *element, GstPad *pad, gpointer
>> data)
>> {
>> GstPad *sinkpad = NULL;
>> GstElement * elemento = (GstElement *) data;
>>
>>
>> /* Ahora linkeo el pad de comp con sink pad */
>> g_print ("Dynamic pad created, linking queue\n");
>> sinkpad = gst_element_get_static_pad (elemento, "sink");
>>
>>
>> gst_pad_link (pad, sinkpad);
>> gst_object_unref(sinkpad);
>>
>> }
>>
>>
>> int main(int argc, char *argv[])
>> {
>>
>> GMainLoop *loop = NULL;
>>
>> GstElement *src1, *src2,*dec1,*dec2,*alfa1,*color,*smpte,*queue,*sink;
>> GstBus *bus;
>>
>> gdouble duracion = 500;
>> gint transicion = 1;
>>
>> cout << "Inicio..." << endl;
>>
>> /* init GStreamer */
>> gst_init (&argc, &argv);
>> gst_controller_init (&argc, &argv);
>>
>> loop = g_main_loop_new (NULL, FALSE);
>>
>> /* make sure we have input */
>> if (argc != 3) {
>> g_print ("Usage: %s <filename1> <filename2>\n", argv[0]);
>> return -1;
>> }
>>
>> src1 = gst_element_factory_make("filesrc", "src1");
>> g_object_set(G_OBJECT(src1),"location",argv[1], NULL);
>>
>> src2 = gst_element_factory_make("filesrc", "src2");
>> g_object_set(G_OBJECT(src1),"location",argv[2], NULL);
>>
>> GstElement *pipeline = gst_pipeline_new ("video-player");
>>
>> dec1 = gst_element_factory_make("decodebin2","dec1");
>>
>> dec2 = gst_element_factory_make("decodebin2","dec2");
>>
>> bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
>> gst_bus_add_watch (bus, bus_call, loop);
>> gst_object_unref (bus);
>>
>> alfa1 = gst_element_factory_make ("alpha","alfa1");
>> smpte = gst_element_factory_make ("smptealpha","smpte");
>> color = gst_element_factory_make ("ffmpegcolorspace", "color");
>> GstElement * mixer = gst_element_factory_make("videomixer", "mixer");
>>
>> if ((!alfa1) || (!smpte) || (!color) || (!mixer))
>> {
>> g_printerr ("Alguno de los elementos del Bin no pudo ser creado.
>> Saliendo\n");
>> return 0;
>> }
>>
>> queue = gst_element_factory_make("queue", "queue");
>> sink = gst_element_factory_make("autovideosink", "sink");
>>
>> cout << "Creando 1..." << endl;
>>
>> // Agrego Controlador
>>
>> GstController * ctrl = NULL;
>> if (!(ctrl = gst_controller_new (G_OBJECT(smpte), "alpha",NULL))) ///
>> Here's the error, always return NULL
>> {
>> cout << "ctrl value..." << ctrl << endl;
>> GST_WARNING ("No puede controlar el elemento fuente\n");
>> return 1;
>> }
>>
>>
>>
>>
>>
>> // Todo valor GValue debe inicializarse en 0
>> GValue val_double = { 0, };
>> g_value_init (&val_double, G_TYPE_DOUBLE);
>>
>>
>> // Creo la fuente al controlador y la asocio al controlador
>> // Seteo modo de interpolacion
>>
>> GstInterpolationControlSource * csource =
>> gst_interpolation_control_source_new();
>> gst_controller_set_control_source (ctrl, "alpha", GST_CONTROL_SOURCE
>> (csource));
>>
>>
>> gst_interpolation_control_source_set_interpolation_mode(csource,GST_INTERPOLATE_LINEAR);
>>
>> // Seteo primer valor
>> g_value_set_double(&val_double, 0.0);
>> gst_interpolation_control_source_set(csource,(0 *
>> GST_MSECOND),&val_double);
>>
>> // Seteo segundo valor
>> g_value_set_double (&val_double, duracion);
>> gst_interpolation_control_source_set(csource,(1 *
>> GST_MSECOND),&val_double);
>>
>> g_object_unref (csource);
>>
>> gst_bin_add_many (GST_BIN (pipeline),src1, src2, dec1, dec2, alfa1,
>> smpte, mixer, queue, color, sink, NULL);
>> g_signal_connect (G_OBJECT (dec1), "pad-added", G_CALLBACK
>> (on_pad_added),alfa1);
>> g_signal_connect (G_OBJECT (dec2), "pad-added", G_CALLBACK
>> (on_pad_added),smpte);
>>
>> gst_element_link (src1,dec1);
>> gst_element_link (src2,dec2);
>> gst_element_link (alfa1,mixer);
>> gst_element_link (smpte,mixer);
>> gst_element_link (mixer,queue);
>> gst_element_link (queue,sink);
>> g_object_set(smpte,"type", transicion, NULL);
>>
>> /* now run */
>> gst_element_set_state (pipeline, GST_STATE_PLAYING);
>> cout << "Playing..." << endl;
>> g_main_loop_run (loop);
>>
>> /* also clean up */
>> gst_element_set_state (pipeline, GST_STATE_NULL);
>> gst_object_unref (GST_OBJECT (pipeline));
>>
>> return 0;
>> }
>>
>>
>>
>>
>> _______________________________________________
>> gstreamer-devel mailing listgstreamer-devel at lists.freedesktop.orghttp://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>>
>> _______________________________________________
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>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>>
>
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