gst_controller_new returns NULL
Rossana Guerra
guerra.rossana at gmail.com
Tue Oct 25 12:09:26 PDT 2011
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;
> }
>
>
>
>
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