--- /dev/null
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) <2005> Tim-Philipp Müller <tim@centricular.net>
+ *
+ * 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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:element-clockoverlay
+ * @see_also: #GstTextOverlay, #GstTimeOverlay
+ *
+ * This element overlays the current clock time on top of a video
+ * stream. You can position the text and configure the font details
+ * using the properties of the #GstTextOverlay class. By default, the
+ * time is displayed in the top left corner of the picture, with some
+ * padding to the left and to the top.
+ *
+ * <refsect2>
+ * <title>Example launch lines</title>
+ * |[
+ * gst-launch -v videotestsrc ! clockoverlay ! xvimagesink
+ * ]| Display the current time in the top left corner of the video picture
+ * |[
+ * gst-launch -v videotestsrc ! clockoverlay halign=right valign=bottom text="Edge City" shaded-background=true ! ffmpegcolorspace ! ximagesink
+ * ]| Another pipeline that displays the current time with some leading
+ * text in the bottom right corner of the video picture, with the background
+ * of the text being shaded in order to make it more legible on top of a
+ * bright video background.
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gstclockoverlay.h>
+#include <gst/video/video.h>
+#include <time.h>
+
+
+#define DEFAULT_PROP_TIMEFORMAT "%H:%M:%S"
+
+enum
+{
+ PROP_0,
+ PROP_TIMEFORMAT,
+ PROP_LAST
+};
+
+GST_BOILERPLATE (GstClockOverlay, gst_clock_overlay, GstTextOverlay,
+ GST_TYPE_TEXT_OVERLAY);
+
+static void
+gst_clock_overlay_base_init (gpointer g_class)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
+
+ gst_element_class_set_details_simple (element_class, "Clock overlay",
+ "Filter/Editor/Video",
+ "Overlays the current clock time on a video stream",
+ "Tim-Philipp Müller <tim@centricular.net>");
+}
+
+
+static void gst_clock_overlay_finalize (GObject * object);
+static void gst_clock_overlay_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec);
+static void gst_clock_overlay_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec);
+
+static gchar *
+gst_clock_overlay_render_time (GstClockOverlay * overlay)
+{
+ struct tm *t;
+ time_t now;
+ gchar buf[256];
+
+#ifdef HAVE_LOCALTIME_R
+ struct tm dummy;
+#endif
+
+ now = time (NULL);
+
+#ifdef HAVE_LOCALTIME_R
+ /* Need to call tzset explicitly when calling localtime_r for changes
+ to the timezone between calls to be visible. */
+ tzset ();
+ t = localtime_r (&now, &dummy);
+#else
+ /* on win32 this apparently returns a per-thread struct which would be fine */
+ t = localtime (&now);
+#endif
+
+ if (t == NULL)
+ return g_strdup ("--:--:--");
+
+ if (strftime (buf, sizeof (buf), overlay->format, t) == 0)
+ return g_strdup ("");
+ return g_strdup (buf);
+}
+
+/* Called with lock held */
+static gchar *
+gst_clock_overlay_get_text (GstTextOverlay * overlay, GstBuffer * video_frame)
+{
+ gchar *time_str, *txt, *ret;
+ GstClockOverlay *clock_overlay = GST_CLOCK_OVERLAY (overlay);
+
+ txt = g_strdup (overlay->default_text);
+
+ time_str = gst_clock_overlay_render_time (clock_overlay);
+ if (txt != NULL && *txt != '\0') {
+ ret = g_strdup_printf ("%s %s", txt, time_str);
+ } else {
+ ret = time_str;
+ time_str = NULL;
+ }
+
+ if (g_strcmp0 (ret, clock_overlay->text)) {
+ overlay->need_render = TRUE;
+ g_free (clock_overlay->text);
+ clock_overlay->text = g_strdup (ret);
+ }
+
+ g_free (txt);
+ g_free (time_str);
+
+ return ret;
+}
+
+static void
+gst_clock_overlay_class_init (GstClockOverlayClass * klass)
+{
+ GObjectClass *gobject_class;
+ GstTextOverlayClass *gsttextoverlay_class;
+ PangoContext *context;
+ PangoFontDescription *font_description;
+
+ gobject_class = (GObjectClass *) klass;
+ gsttextoverlay_class = (GstTextOverlayClass *) klass;
+
+ gobject_class->finalize = gst_clock_overlay_finalize;
+ gobject_class->set_property = gst_clock_overlay_set_property;
+ gobject_class->get_property = gst_clock_overlay_get_property;
+
+ gsttextoverlay_class->get_text = gst_clock_overlay_get_text;
+
+ g_object_class_install_property (gobject_class, PROP_TIMEFORMAT,
+ g_param_spec_string ("time-format", "Date/Time Format",
+ "Format to use for time and date value, as in strftime.",
+ DEFAULT_PROP_TIMEFORMAT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ g_mutex_lock (GST_TEXT_OVERLAY_CLASS (klass)->pango_lock);
+ context = GST_TEXT_OVERLAY_CLASS (klass)->pango_context;
+
+ pango_context_set_language (context, pango_language_from_string ("en_US"));
+ pango_context_set_base_dir (context, PANGO_DIRECTION_LTR);
+
+ font_description = pango_font_description_new ();
+ pango_font_description_set_family_static (font_description, "Monospace");
+ pango_font_description_set_style (font_description, PANGO_STYLE_NORMAL);
+ pango_font_description_set_variant (font_description, PANGO_VARIANT_NORMAL);
+ pango_font_description_set_weight (font_description, PANGO_WEIGHT_NORMAL);
+ pango_font_description_set_stretch (font_description, PANGO_STRETCH_NORMAL);
+ pango_font_description_set_size (font_description, 18 * PANGO_SCALE);
+ pango_context_set_font_description (context, font_description);
+ pango_font_description_free (font_description);
+ g_mutex_unlock (GST_TEXT_OVERLAY_CLASS (klass)->pango_lock);
+}
+
+
+static void
+gst_clock_overlay_finalize (GObject * object)
+{
+ GstClockOverlay *overlay = GST_CLOCK_OVERLAY (object);
+
+ g_free (overlay->format);
+ g_free (overlay->text);
+ overlay->format = NULL;
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+
+static void
+gst_clock_overlay_init (GstClockOverlay * overlay, GstClockOverlayClass * klass)
+{
+ GstTextOverlay *textoverlay;
+
+ textoverlay = GST_TEXT_OVERLAY (overlay);
+
+ textoverlay->valign = GST_TEXT_OVERLAY_VALIGN_TOP;
+ textoverlay->halign = GST_TEXT_OVERLAY_HALIGN_LEFT;
+
+ overlay->format = g_strdup (DEFAULT_PROP_TIMEFORMAT);
+}
+
+
+static void
+gst_clock_overlay_set_property (GObject * object, guint prop_id,
+ const GValue * value, GParamSpec * pspec)
+{
+ GstClockOverlay *overlay = GST_CLOCK_OVERLAY (object);
+
+ GST_OBJECT_LOCK (overlay);
+ switch (prop_id) {
+ case PROP_TIMEFORMAT:
+ g_free (overlay->format);
+ overlay->format = g_value_dup_string (value);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+ GST_OBJECT_UNLOCK (overlay);
+}
+
+
+static void
+gst_clock_overlay_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstClockOverlay *overlay = GST_CLOCK_OVERLAY (object);
+
+ GST_OBJECT_LOCK (overlay);
+ switch (prop_id) {
+ case PROP_TIMEFORMAT:
+ g_value_set_string (value, overlay->format);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+ GST_OBJECT_UNLOCK (overlay);
+}
projects / mafwsubrenderer / blobdiff