/* * filter.c * * demo application for filters using dparams * dparams get their sliders which you can play with * * you can also enter an input and output part of a pipeline */ #include #include #include #include /* filter UI data */ struct _filter_ui { GtkWidget *window; /* top-level interface window */ GtkWidget *buttons; /* all of the control buttons */ GtkWidget *parse, *play, *stop; /* control buttons */ GtkWidget *feedback; /* here's where we'll tell you stuff */ GtkTextBuffer *fb_buffer; /* feedback buffer */ GtkWidget *selection; /* the place to input element stuff */ GtkWidget *input, *filter, *output; /* the selection widgets */ GtkWidget *control; /* the dynamically generated control UI */ }; typedef struct _filter_ui _filter_ui_t; /* back-end data */ struct _filter_data { _filter_ui_t *ui; /* the UI data */ gchar *input_pipe, *output_pipe, *filter_element; gchar *pipe_string; GList *filter_choices; gboolean playing; GstElement *input, *output; /* these are in and out bins */ GstElement *pipeline; GstElement *filter; }; typedef struct _filter_data _filter_data_t; /* internal prototypes when they can't be avoided */ void cb_remove_and_destroy (GtkWidget * widget, gpointer user_data); //void cb_dynparm_value_changed (GtkWidget *widget, gpointer user_data); void cb_dynparm_value_changed (GtkRange * range, GstDParam * dparam); /* GStreamer helper functions go here */ /* go through a bin, finding the one pad that is unconnected in the given * direction, and return a ghost pad */ GstPad * gst_bin_find_unconnected_pad (GstBin * bin, GstPadDirection direction, gchar * name) { GstPad *pad = NULL; GList *elements = NULL; const GList *pads = NULL; GstElement *element = NULL; g_print ("DEBUG: find_unconnected start\n"); elements = (GList *) gst_bin_get_list (bin); /* traverse all elements looking for unconnected pads */ while (elements && pad == NULL) { element = GST_ELEMENT (elements->data); g_print ("DEBUG: looking in element %s\n", gst_element_get_name (element)); pads = gst_element_get_pad_list (element); while (pads) { /* check if the direction matches */ if (GST_PAD_DIRECTION (GST_PAD (pads->data)) == direction) { if (GST_PAD_PEER (GST_PAD (pads->data)) == NULL) { /* found it ! */ g_print ("DEBUG: found an unconnected pad !\n"); pad = GST_PAD (pads->data); } } if (pad) break; /* found one already */ pads = g_list_next (pads); } elements = g_list_next (elements); } g_print ("DEBUG: find_unconnected stop\n"); if (pad == NULL) /* we didn't find it at all */ return NULL; pad = gst_ghost_pad_new (name, pad); return pad; } void ui_feedback_add_text (_filter_ui_t * ui, const gchar * text) { GtkTextIter iter; gtk_text_buffer_get_end_iter (ui->fb_buffer, &iter); gtk_text_buffer_insert (ui->fb_buffer, &iter, text, -1); } void ui_feedback_add (_filter_ui_t * ui, const gchar * format, ...) { va_list args; gchar *buffer = NULL; va_start (args, format); buffer = g_strdup_vprintf (format, args); va_end (args); ui_feedback_add_text (ui, buffer); g_free (buffer); } void ui_feedback_clear (_filter_ui_t * ui) { gtk_text_buffer_set_text (ui->fb_buffer, "", 0); } /* create the control widget using the element's dynparams * control is a vbox which we need to empty first */ void ui_control_create (GstElement * element, GtkWidget * control, _filter_ui_t * ui) { GtkWidget *hbox = NULL; GtkWidget *widget = NULL; GstDParamManager *dpman = NULL; GstDParam *dparam = NULL; GParamSpec **specs = NULL; int i = 0; g_assert (GTK_IS_VBOX (control)); /* empty control vbox */ g_print ("DEBUG: emptying control widget\n"); gtk_container_foreach (GTK_CONTAINER (control), cb_remove_and_destroy, (gpointer) control); g_print ("DEBUG: adding label to control widget\n"); widget = gtk_label_new ("Dynamic Parameters"); gtk_container_add (GTK_CONTAINER (control), widget); gtk_widget_show (widget); if ((dpman = gst_dpman_get_manager (element))) { ui_feedback_add (ui, "Found Dynamic Parameters on filter element.\n"); specs = gst_dpman_list_dparam_specs (dpman); for (i = 0; specs[i] != NULL; ++i) { hbox = gtk_hbox_new (FALSE, 0); widget = gtk_label_new (g_param_spec_get_name (specs[i])); gtk_container_add (GTK_CONTAINER (hbox), widget); gtk_widget_show (widget); switch (G_PARAM_SPEC_VALUE_TYPE (specs[i])) { case G_TYPE_INT64: widget = gtk_hscale_new_with_range ( (gdouble) (((GParamSpecInt64 *) specs[i])->minimum), (gdouble) (((GParamSpecInt64 *) specs[i])->maximum), 1.0); gtk_range_set_value (GTK_RANGE (widget), (gdouble) ((GParamSpecInt64 *) specs[i])->default_value); break; case G_TYPE_INT: widget = gtk_hscale_new_with_range ( (gdouble) (((GParamSpecInt *) specs[i])->minimum), (gdouble) (((GParamSpecInt *) specs[i])->maximum), 1.0); gtk_range_set_value (GTK_RANGE (widget), (gdouble) ((GParamSpecInt *) specs[i])->default_value); break; case G_TYPE_FLOAT: widget = gtk_hscale_new_with_range ( (gdouble) (((GParamSpecFloat *) specs[i])->minimum), (gdouble) (((GParamSpecFloat *) specs[i])->maximum), 0.00001); gtk_range_set_value (GTK_RANGE (widget), (gdouble) ((GParamSpecFloat *) specs[i])->default_value); break; } /* create the dparam object */ dparam = gst_dpsmooth_new (G_PARAM_SPEC_VALUE_TYPE (specs[i])); g_object_set (G_OBJECT (dparam), "update_period", 2000000LL, NULL); if (!gst_dpman_attach_dparam (dpman, (gchar *) g_param_spec_get_name (specs[i]), dparam)) g_assert_not_reached (); gst_dpman_set_mode (dpman, "asynchronous"); g_signal_connect (widget, "value-changed", G_CALLBACK (cb_dynparm_value_changed), dparam); cb_dynparm_value_changed (GTK_RANGE (widget), dparam); gtk_container_add (GTK_CONTAINER (hbox), widget); gtk_widget_show (widget); } gtk_container_add (GTK_CONTAINER (control), hbox); gtk_widget_show (hbox); } } /* all the pretty callbacks gather here please */ void cb_remove_and_destroy (GtkWidget * widget, gpointer user_data) { GtkContainer *container = GTK_CONTAINER (user_data); g_print ("DEBUG: trying to remove widget from a container.\n"); gtk_container_remove (container, widget); gtk_widget_destroy (widget); } /* when the scale associated with a dparam changes, respond */ void cb_dynparm_value_changed (GtkRange * range, GstDParam * dparam) { /* GstDParam *dparam = GST_DPARAM (user_data); GtkHScale *adj = GTK_HSCALE (widget); */ gdouble value = 0.0; g_assert (GST_IS_DPARAM (dparam)); g_assert (GTK_IS_RANGE (range)); value = gtk_range_get_value (range); g_print ("DEBUG: setting value to %f\n", value); switch (G_PARAM_SPEC_VALUE_TYPE (GST_DPARAM_PARAM_SPEC (dparam))) { case G_TYPE_INT64: g_object_set (G_OBJECT (dparam), "value_int64", (gint64) value, NULL); break; case G_TYPE_INT: g_object_set (G_OBJECT (dparam), "value_int", (gint) value, NULL); break; case G_TYPE_FLOAT: g_object_set (G_OBJECT (dparam), "value_float", (gfloat) value, NULL); break; } } void cb_entry_activate (GtkEntry * entry, gpointer user_data) { g_print ("DEBUG: oi ! you activated an entry !\n"); g_print ("DEBUG: pipeline: %s\n", gtk_entry_get_text (entry)); } void cb_play_clicked (GtkButton * button, gpointer * user_data) { _filter_data_t *fd = (_filter_data_t *) user_data; g_return_if_fail (GST_IS_PIPELINE (fd->pipeline)); if (GST_STATE (fd->pipeline) == GST_STATE_PLAYING) { ui_feedback_add (fd->ui, "Pipeline is already playing !\n"); return; } gst_element_set_state (fd->pipeline, GST_STATE_PLAYING); } void cb_stop_clicked (GtkButton * button, gpointer * user_data) { _filter_data_t *fd = (_filter_data_t *) user_data; if (GST_STATE (fd->pipeline) != GST_STATE_PLAYING) { ui_feedback_add (fd->ui, "Pipeline is not playing !\n"); return; } gst_element_set_state (fd->pipeline, GST_STATE_NULL); } void cb_parse_clicked (GtkButton * button, gpointer * user_data) { _filter_data_t *fd = (_filter_data_t *) user_data; GtkCombo *filter = GTK_COMBO (fd->ui->filter); GError *error = NULL; GstPad *src_pad, *sink_pad; g_print ("DEBUG: you pressed parse.\n"); ui_feedback_clear (fd->ui); ui_feedback_add (fd->ui, "Parsing pipeline ...\n"); if (fd->input_pipe) g_free (fd->input_pipe); if (fd->output_pipe) g_free (fd->output_pipe); if (fd->filter_element) g_free (fd->filter_element); fd->input_pipe = g_strdup_printf ("bin.( %s )", gtk_entry_get_text (GTK_ENTRY (fd->ui->input))); fd->output_pipe = g_strdup_printf ("bin.( %s )", gtk_entry_get_text (GTK_ENTRY (fd->ui->output))); /* gtkcombo.h says I can access the entry field directly */ fd->filter_element = g_strdup (gtk_entry_get_text (GTK_ENTRY (filter->entry))); g_print ("Input pipeline :\t%s (%d)\n", fd->input_pipe, (int) strlen (fd->input_pipe)); g_print ("Filter element :\t%s (%d)\n", fd->filter_element, (int) strlen (fd->filter_element)); g_print ("Output pipeline :\t%s (%d)\n", fd->output_pipe, (int) strlen (fd->output_pipe)); /* try to create in and out bins */ if (strlen (fd->input_pipe) == 0) { ui_feedback_add (fd->ui, "Error : try setting an input pipe.\n"); return; } if (fd->input) gst_object_unref (GST_OBJECT (fd->input)); fd->input = GST_ELEMENT (gst_parse_launch (fd->input_pipe, &error)); if (error) { ui_feedback_add (fd->ui, "Error : parsing input pipeline : %s\n", error->message); g_error_free (error); return; } if (strlen (fd->output_pipe) == 0) { ui_feedback_add (fd->ui, "Error : try setting an output pipe.\n"); return; } if (fd->output) gst_object_unref (GST_OBJECT (fd->output)); fd->output = GST_ELEMENT (gst_parse_launch (fd->output_pipe, &error)); if (error) { ui_feedback_add (fd->ui, "Error : parsing output pipeline : %s\n", error->message); g_error_free (error); return; } /* try to create filter */ if (fd->filter) gst_object_unref (GST_OBJECT (fd->filter)); fd->filter = gst_element_factory_make (fd->filter_element, "filter"); if (fd->filter == NULL) { ui_feedback_add (fd->ui, "Error : could not create element %s\n", fd->filter_element); return; } /* set up dynparam controls for filter */ ui_control_create (fd->filter, fd->ui->control, fd->ui); /* create toplevel bin */ fd->pipeline = gst_thread_new ("toplevel"); /* add the players to it */ gst_bin_add_many (GST_BIN (fd->pipeline), fd->input, fd->filter, fd->output, NULL); /* connect filter to input and output bin */ src_pad = gst_bin_find_unconnected_pad (GST_BIN (fd->input), GST_PAD_SRC, "source"); if (src_pad == NULL) { ui_feedback_add (fd->ui, "Error : could not find an unconnected source pad !\n"); return; } sink_pad = gst_bin_find_unconnected_pad (GST_BIN (fd->output), GST_PAD_SINK, "sink"); if (sink_pad == NULL) { ui_feedback_add (fd->ui, "Error : could not find an unconnected sink pad !\n"); return; } gst_element_add_pad (fd->input, src_pad); gst_element_add_pad (fd->output, sink_pad); gst_element_link_many (fd->input, fd->filter, fd->output, NULL); if (fd->pipe_string) g_free (fd->pipe_string); fd->pipe_string = g_strdup_printf ("%s ! %s ! %s", fd->input_pipe, fd->filter_element, fd->output_pipe); g_print ("Pipeline : %s\n", fd->pipe_string); ui_feedback_add (fd->ui, "Complete parsed pipeline: %s\n", fd->pipe_string); } /* find out the list of choices for GStreamer filters */ GList * get_filter_choices (void) { GList *choices = NULL; choices = g_list_append (choices, "volume"); choices = g_list_append (choices, "ladspa_lpf"); choices = g_list_append (choices, "ladspa_hpf"); return choices; } void init_data (_filter_data_t * fd) { fd->input_pipe = NULL; fd->output_pipe = NULL; fd->filter_element = NULL; fd->pipe_string = NULL; fd->filter_choices = get_filter_choices (); /* GStreamer stuff */ fd->input = NULL; fd->output = NULL; fd->filter = NULL; fd->pipeline = NULL; fd->playing = FALSE; } void create_ui (_filter_ui_t * fui, _filter_data_t * fd) { GtkWidget *widget; /* temporary widget */ GtkWidget *vbox; /* temporary vbox */ g_print ("DEBUG: creating top-level window\n"); fui->window = gtk_window_new (GTK_WINDOW_TOPLEVEL); widget = gtk_vbox_new (FALSE, 0); gtk_container_add (GTK_CONTAINER (fui->window), widget); gtk_window_set_title (GTK_WINDOW (fui->window), "Gee, I can set titles too"); /* top level window division */ g_print ("DEBUG: creating top-level window contents\n"); fui->buttons = gtk_hbox_new (FALSE, 0); gtk_container_add (GTK_CONTAINER (widget), fui->buttons); fui->feedback = gtk_text_view_new (); gtk_container_add (GTK_CONTAINER (widget), fui->feedback); fui->selection = gtk_hbox_new (FALSE, 0); gtk_container_add (GTK_CONTAINER (widget), fui->selection); fui->control = gtk_vbox_new (TRUE, 5); gtk_container_add (GTK_CONTAINER (widget), fui->control); /* button widget */ fui->parse = gtk_button_new_with_label ("Parse"); gtk_container_add (GTK_CONTAINER (fui->buttons), fui->parse); g_signal_connect (G_OBJECT (fui->parse), "clicked", G_CALLBACK (cb_parse_clicked), fd); fui->play = gtk_button_new_with_label ("Play"); gtk_container_add (GTK_CONTAINER (fui->buttons), fui->play); g_signal_connect (G_OBJECT (fui->play), "clicked", G_CALLBACK (cb_play_clicked), fd); fui->stop = gtk_button_new_with_label ("Stop"); gtk_container_add (GTK_CONTAINER (fui->buttons), fui->stop); g_signal_connect (G_OBJECT (fui->stop), "clicked", G_CALLBACK (cb_stop_clicked), fd); /* feedback widget */ fui->fb_buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (fui->feedback)); gtk_text_buffer_set_text (fui->fb_buffer, "Hello, and welcome to the GStreamer filter demo app !\n" "I'll be your feedback window for today.\n", -1); /* selection widget */ vbox = gtk_vbox_new (FALSE, 0); widget = gtk_label_new ("Input Pipe"); gtk_container_add (GTK_CONTAINER (vbox), widget); fui->input = gtk_entry_new (); gtk_entry_set_text (GTK_ENTRY (fui->input), "sinesrc"); gtk_container_add (GTK_CONTAINER (vbox), fui->input); gtk_container_add (GTK_CONTAINER (fui->selection), vbox); g_signal_connect (G_OBJECT (fui->input), "activate", G_CALLBACK (cb_entry_activate), NULL); vbox = gtk_vbox_new (FALSE, 0); widget = gtk_label_new ("Filter"); gtk_container_add (GTK_CONTAINER (vbox), widget); fui->filter = gtk_combo_new (); gtk_combo_set_popdown_strings (GTK_COMBO (fui->filter), fd->filter_choices); gtk_container_add (GTK_CONTAINER (vbox), fui->filter); gtk_container_add (GTK_CONTAINER (fui->selection), vbox); vbox = gtk_vbox_new (FALSE, 0); widget = gtk_label_new ("Output Pipe"); gtk_container_add (GTK_CONTAINER (vbox), widget); fui->output = gtk_entry_new (); gtk_entry_set_text (GTK_ENTRY (fui->output), "osssink fragment=1572872"); /* fixme: gconf default ? */ gtk_container_add (GTK_CONTAINER (vbox), fui->output); gtk_container_add (GTK_CONTAINER (fui->selection), vbox); g_signal_connect (G_OBJECT (fui->output), "activate", G_CALLBACK (cb_entry_activate), NULL); /* control widget is dynamically generated */ /* g_print ("DEBUG: labeling control area.\n"); widget = gtk_label_new ("This is the big control area."); gtk_container_add (GTK_CONTAINER (fui->control), widget); */ } int main (int argc, char *argv[]) { _filter_data_t filter_data; _filter_ui_t filter_ui; gtk_init (&argc, &argv); gst_init (&argc, &argv); gst_control_init (&argc, &argv); init_data (&filter_data); filter_data.ui = &filter_ui; create_ui (&filter_ui, &filter_data); gtk_widget_show_all (filter_ui.window); gtk_main (); return 0; }