--- /dev/null
+/* GStreamer
+ * Copyright (C) <2015> Stefan Sauer <ensonic@users.sf.net>
+ *
+ * controller-graph: explore interpolation types
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <math.h>
+
+#include <glib.h>
+#include <gtk/gtk.h>
+
+#include <gst/gst.h>
+#include <gst/controller/gstinterpolationcontrolsource.h>
+
+GtkWidget *graph;
+GstControlSource *cs = NULL;
+gdouble yval[] = { 0.0, 0.2, 0.8, 0.1, 0.1, 1.0 };
+
+static gboolean
+on_graph_draw (GtkWidget * widget, cairo_t * cr, gpointer user_data)
+{
+ GtkStyleContext *style = gtk_widget_get_style_context (widget);
+ GtkAllocation alloc;
+ gint x, y, w, h;
+ gdouble *data;
+ guint64 ts, ts_step;
+ gint i;
+ GstTimedValueControlSource *tvcs = (GstTimedValueControlSource *) cs;
+
+ gtk_widget_get_allocation (widget, &alloc);
+ w = alloc.width;
+ h = alloc.height;
+ gtk_render_background (style, cr, 0, 0, w, h);
+ // add some border:
+ x = 5;
+ y = 5;
+ w -= (x + x);
+ h -= (y + y);
+
+ // build graph
+ ts = G_GUINT64_CONSTANT (0);
+ ts_step = w / (G_N_ELEMENTS (yval) - 1);
+ gst_timed_value_control_source_unset_all (tvcs);
+ for (i = 0; i < G_N_ELEMENTS (yval); i++) {
+ gst_timed_value_control_source_set (tvcs, ts, yval[i]);
+ ts += ts_step;
+ }
+ data = g_new (gdouble, w);
+ gst_control_source_get_value_array (cs, 0, 1, w, data);
+
+ // draw background
+ cairo_set_source_rgb (cr, 0.5, 0.5, 0.5);
+ cairo_rectangle (cr, x, y, w, h);
+ cairo_stroke_preserve (cr);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+ cairo_fill (cr);
+
+
+ // plot graph
+ cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
+ cairo_set_line_width (cr, 1.0);
+ cairo_move_to (cr, x, y + data[0] * h);
+ for (i = 1; i < w; i++) {
+ cairo_line_to (cr, x + i, y + CLAMP (data[i], 0.0, 1.0) * h);
+ }
+ cairo_stroke (cr);
+
+ // plot control points
+ ts = G_GUINT64_CONSTANT (0);
+ for (i = 0; i < G_N_ELEMENTS (yval); i++) {
+ cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
+ cairo_arc (cr, x + ts, y + yval[i] * h, 3.0, 0.0, 2 * M_PI);
+ cairo_stroke_preserve (cr);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
+ cairo_fill (cr);
+ ts += ts_step;
+ }
+
+ g_free (data);
+
+ return TRUE;
+}
+
+static void
+on_mode_changed (GtkComboBox * combo, gpointer user_data)
+{
+ g_object_set (cs, "mode", gtk_combo_box_get_active (combo), NULL);
+ gtk_widget_queue_draw (graph);
+}
+
+static void
+on_yval_changed (GtkSpinButton * spin, gpointer user_data)
+{
+ guint ix = GPOINTER_TO_UINT (user_data);
+ yval[ix] = gtk_spin_button_get_value (spin);
+ gtk_widget_queue_draw (graph);
+}
+
+int
+main (int argc, char **argv)
+{
+ GtkWidget *window;
+ GtkWidget *layout, *label, *combo, *box, *spin;
+ GEnumClass *enum_class;
+ GEnumValue *enum_value;
+ gint i;
+
+ gst_init (&argc, &argv);
+ gtk_init (&argc, &argv);
+
+ cs = gst_interpolation_control_source_new ();
+ g_object_set (cs, "mode", GST_INTERPOLATION_MODE_LINEAR, NULL);
+
+ window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+ g_signal_connect (G_OBJECT (window), "delete-event", gtk_main_quit, NULL);
+ gtk_window_set_default_size (GTK_WINDOW (window), 320, 240);
+ gtk_window_set_title (GTK_WINDOW (window),
+ "GstInterpolationControlSource demo");
+
+ layout = gtk_grid_new ();
+
+ graph = gtk_drawing_area_new ();
+ gtk_widget_add_events (graph, GDK_POINTER_MOTION_MASK);
+ g_signal_connect (graph, "draw", G_CALLBACK (on_graph_draw), NULL);
+ g_object_set (graph, "hexpand", TRUE, "vexpand", TRUE, "margin-bottom", 3,
+ NULL);
+ gtk_grid_attach (GTK_GRID (layout), graph, 0, 0, 2, 1);
+
+ // add controls to move the yvals
+ box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 3);
+ g_object_set (box, "homogeneous", TRUE, "margin-bottom", 3, NULL);
+ for (i = 0; i < G_N_ELEMENTS (yval); i++) {
+ spin = gtk_spin_button_new_with_range (0.0, 1.0, 0.05);
+ gtk_spin_button_set_value (GTK_SPIN_BUTTON (spin), yval[i]);
+ g_signal_connect (spin, "changed", G_CALLBACK (on_yval_changed),
+ GUINT_TO_POINTER (i));
+ gtk_container_add (GTK_CONTAINER (box), spin);
+ }
+ gtk_grid_attach (GTK_GRID (layout), box, 0, 1, 2, 1);
+
+ // combo for interpolation modes
+ label = gtk_label_new ("interpolation mode");
+ gtk_grid_attach (GTK_GRID (layout), label, 0, 2, 1, 1);
+
+ combo = gtk_combo_box_text_new ();
+ enum_class = g_type_class_ref (GST_TYPE_INTERPOLATION_MODE);
+ for (i = enum_class->minimum; i <= enum_class->maximum; i++) {
+ if ((enum_value = g_enum_get_value (enum_class, i))) {
+ gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (combo),
+ enum_value->value_nick);
+ }
+ }
+ gtk_combo_box_set_active (GTK_COMBO_BOX (combo),
+ GST_INTERPOLATION_MODE_LINEAR);
+ g_signal_connect (combo, "changed", G_CALLBACK (on_mode_changed), NULL);
+ g_object_set (combo, "hexpand", TRUE, "margin-left", 3, NULL);
+ gtk_grid_attach (GTK_GRID (layout), combo, 1, 2, 1, 1);
+
+ gtk_container_set_border_width (GTK_CONTAINER (window), 6);
+ gtk_container_add (GTK_CONTAINER (window), layout);
+ gtk_widget_show_all (window);
+
+ gtk_main ();
+
+ return 0;
+}
projects / platform / upstream / gstreamer.git / commitdiff