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