Commit 6e7915d5 authored by Stefan Sauer's avatar Stefan Sauer
Browse files

tests/examples: add a demo for the interpolation control source modes

This is in preparation for new modes to be added. In particullar it demonstrates
how the cubic splines overshoot the range.
parent 7f5f1df5
......@@ -775,6 +775,16 @@ dnl Check for documentation xrefs
GLIB_PREFIX="`$PKG_CONFIG --variable=prefix glib-2.0`"
AC_SUBST(GLIB_PREFIX)
dnl GTK is optional and only used in examples
HAVE_GTK=no
GTK_REQ=3.10
if test "x$BUILD_EXAMPLES" = "xyes"; then
PKG_CHECK_MODULES(GTK, gtk+-3.0 >= $GTK_REQ, HAVE_GTK=yes, HAVE_GTK=no)
AC_SUBST(GTK_LIBS)
AC_SUBST(GTK_CFLAGS)
fi
AM_CONDITIONAL(HAVE_GTK, test "x$HAVE_GTK" = "xyes")
dnl building of unit test libraries
AC_ARG_ENABLE(check,
AS_HELP_STRING([--disable-check],[disable building unit test libraries]),
......
audio-example
control-sources
controller-graph
text-color-example
absolute-example
*.bb
......
......@@ -5,3 +5,13 @@ AM_CFLAGS = $(GST_OBJ_CFLAGS) -I$(top_builddir)/libs
LDADD = \
$(top_builddir)/libs/gst/controller/libgstcontroller-@GST_API_VERSION@.la \
$(GST_OBJ_LIBS)
if HAVE_GTK
noinst_PROGRAMS += controller-graph
controller_graph_CFLAGS = $(GST_OBJ_CFLAGS) $(GTK_CFLAGS)
controller_graph_LDADD = \
$(top_builddir)/libs/gst/controller/libgstcontroller-@GST_API_VERSION@.la \
$(GST_OBJ_LIBS) $(GTK_LIBS)
endif
\ No newline at end of file
/* 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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