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275 lines
8.1 KiB
C
275 lines
8.1 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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* Copyright (C) <2005> Tim-Philipp Müller <tim@centricular.net>
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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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/**
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* SECTION:element-clockoverlay
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* @title: clockoverlay
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* @see_also: #GstBaseTextOverlay, #GstTimeOverlay
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*
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* This element overlays the current clock time on top of a video
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* stream. You can position the text and configure the font details
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* using its properties.
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*
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* By default, the time is displayed in the top left corner of the picture, with some
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* padding to the left and to the top.
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*
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* ## Example launch lines
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* |[
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* gst-launch-1.0 -v videotestsrc ! clockoverlay ! autovideosink
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* ]|
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* Display the current wall clock time in the top left corner of the video picture
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* |[
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* gst-launch-1.0 -v videotestsrc ! clockoverlay halignment=right valignment=bottom text="Edge City" shaded-background=true font-desc="Sans, 36" ! videoconvert ! autovideosink
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* ]|
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* Another pipeline that displays the current time with some leading
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* text in the bottom right corner of the video picture, with the background
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* of the text being shaded in order to make it more legible on top of a
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* bright video background.
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*
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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 <gst/video/video.h>
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#include <time.h>
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#include "gstclockoverlay.h"
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#include "gstpangoelements.h"
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#define DEFAULT_PROP_TIMEFORMAT "%H:%M:%S"
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enum
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{
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PROP_0,
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PROP_TIMEFORMAT,
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PROP_LAST
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};
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#define gst_clock_overlay_parent_class parent_class
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G_DEFINE_TYPE (GstClockOverlay, gst_clock_overlay, GST_TYPE_BASE_TEXT_OVERLAY);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (clockoverlay, "clockoverlay",
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GST_RANK_NONE, GST_TYPE_CLOCK_OVERLAY, pango_element_init (plugin));
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static void gst_clock_overlay_finalize (GObject * object);
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static void gst_clock_overlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_clock_overlay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static gchar *
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gst_clock_overlay_render_time (GstClockOverlay * overlay)
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{
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#ifdef HAVE_LOCALTIME_R
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struct tm dummy;
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#endif
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struct tm *t;
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time_t now;
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#ifdef G_OS_WIN32
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gunichar2 buf[256];
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#else
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gchar buf[256];
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#endif
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now = time (NULL);
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#ifdef HAVE_LOCALTIME_R
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/* Need to call tzset explicitly when calling localtime_r for changes
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* to the timezone between calls to be visible. */
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tzset ();
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t = localtime_r (&now, &dummy);
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#else
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/* on win32 this apparently returns a per-thread struct which would be fine */
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t = localtime (&now);
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#endif
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if (t == NULL)
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return g_strdup ("--:--:--");
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#ifdef G_OS_WIN32
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if (wcsftime (buf, sizeof (buf), (wchar_t *) overlay->wformat, t) == 0)
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return g_strdup ("");
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return g_utf16_to_utf8 (buf, -1, NULL, NULL, NULL);
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#else
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if (strftime (buf, sizeof (buf), overlay->format, t) == 0)
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return g_strdup ("");
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return g_strdup (buf);
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#endif
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}
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/* Called with lock held */
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static gchar *
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gst_clock_overlay_get_text (GstBaseTextOverlay * overlay,
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GstBuffer * video_frame)
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{
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gchar *time_str, *txt, *ret;
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GstClockOverlay *clock_overlay = GST_CLOCK_OVERLAY (overlay);
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txt = g_strdup (overlay->default_text);
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GST_OBJECT_LOCK (overlay);
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time_str = gst_clock_overlay_render_time (clock_overlay);
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GST_OBJECT_UNLOCK (overlay);
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if (txt != NULL && *txt != '\0') {
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ret = g_strdup_printf ("%s %s", txt, time_str);
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} else {
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ret = time_str;
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time_str = NULL;
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}
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if (g_strcmp0 (ret, clock_overlay->text)) {
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overlay->need_render = TRUE;
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g_free (clock_overlay->text);
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clock_overlay->text = g_strdup (ret);
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}
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g_free (txt);
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g_free (time_str);
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return ret;
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}
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static void
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gst_clock_overlay_class_init (GstClockOverlayClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseTextOverlayClass *gsttextoverlay_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gsttextoverlay_class = (GstBaseTextOverlayClass *) klass;
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gobject_class->finalize = gst_clock_overlay_finalize;
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gobject_class->set_property = gst_clock_overlay_set_property;
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gobject_class->get_property = gst_clock_overlay_get_property;
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gst_element_class_set_static_metadata (gstelement_class, "Clock overlay",
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"Filter/Editor/Video",
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"Overlays the current clock time on a video stream",
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"Tim-Philipp Müller <tim@centricular.net>");
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gsttextoverlay_class->get_text = gst_clock_overlay_get_text;
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g_object_class_install_property (gobject_class, PROP_TIMEFORMAT,
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g_param_spec_string ("time-format", "Date/Time Format",
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"Format to use for time and date value, as in strftime.",
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DEFAULT_PROP_TIMEFORMAT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_clock_overlay_finalize (GObject * object)
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{
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GstClockOverlay *overlay = GST_CLOCK_OVERLAY (object);
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g_free (overlay->format);
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g_free (overlay->text);
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overlay->format = NULL;
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g_free (overlay->wformat);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_clock_overlay_init (GstClockOverlay * overlay)
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{
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GstBaseTextOverlay *textoverlay;
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PangoContext *context;
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PangoFontDescription *font_description;
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textoverlay = GST_BASE_TEXT_OVERLAY (overlay);
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textoverlay->valign = GST_BASE_TEXT_OVERLAY_VALIGN_TOP;
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textoverlay->halign = GST_BASE_TEXT_OVERLAY_HALIGN_LEFT;
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overlay->format = g_strdup (DEFAULT_PROP_TIMEFORMAT);
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#ifdef G_OS_WIN32
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overlay->wformat =
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g_utf8_to_utf16 (DEFAULT_PROP_TIMEFORMAT, -1, NULL, NULL, NULL);
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#endif
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context = textoverlay->pango_context;
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pango_context_set_language (context, pango_language_from_string ("en_US"));
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pango_context_set_base_dir (context, PANGO_DIRECTION_LTR);
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font_description = pango_font_description_new ();
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pango_font_description_set_family_static (font_description, "Monospace");
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pango_font_description_set_style (font_description, PANGO_STYLE_NORMAL);
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pango_font_description_set_variant (font_description, PANGO_VARIANT_NORMAL);
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pango_font_description_set_weight (font_description, PANGO_WEIGHT_NORMAL);
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pango_font_description_set_stretch (font_description, PANGO_STRETCH_NORMAL);
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pango_font_description_set_size (font_description, 18 * PANGO_SCALE);
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pango_context_set_font_description (context, font_description);
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pango_font_description_free (font_description);
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}
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static void
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gst_clock_overlay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstClockOverlay *overlay = GST_CLOCK_OVERLAY (object);
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GST_OBJECT_LOCK (overlay);
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switch (prop_id) {
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case PROP_TIMEFORMAT:
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g_free (overlay->format);
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overlay->format = g_value_dup_string (value);
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if (!overlay->format)
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overlay->format = g_strdup (DEFAULT_PROP_TIMEFORMAT);
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#ifdef G_OS_WIN32
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g_free (overlay->wformat);
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overlay->wformat =
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g_utf8_to_utf16 (overlay->format, -1, NULL, NULL, NULL);
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#endif
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (overlay);
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}
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static void
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gst_clock_overlay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstClockOverlay *overlay = GST_CLOCK_OVERLAY (object);
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GST_OBJECT_LOCK (overlay);
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switch (prop_id) {
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case PROP_TIMEFORMAT:
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g_value_set_string (value, overlay->format);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (overlay);
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}
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