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/* 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;
}
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