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150 lines
5 KiB
C
150 lines
5 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-timeoverlay
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* @see_also: #GstBaseTextOverlay, #GstClockOverlay
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*
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* This element overlays the buffer time stamps of a video stream on
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* top of itself. You can position the text and configure the font details
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* using the properties of the #GstBaseTextOverlay class. By default, the
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* time stamp 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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* <refsect2>
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* |[
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* gst-launch -v videotestsrc ! timeoverlay ! xvimagesink
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* ]| Display the time stamps in the top left
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* corner of the video picture.
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* |[
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* gst-launch -v videotestsrc ! timeoverlay halign=right valign=bottom text="Stream time:" shaded-background=true ! xvimagesink
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* ]| Another pipeline that displays the time stamps 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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* </refsect2>
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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 <gsttimeoverlay.h>
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#define gst_time_overlay_parent_class parent_class
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G_DEFINE_TYPE (GstTimeOverlay, gst_time_overlay, GST_TYPE_BASE_TEXT_OVERLAY);
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static gchar *
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gst_time_overlay_render_time (GstTimeOverlay * overlay, GstClockTime time)
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{
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guint hours, mins, secs, msecs;
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if (!GST_CLOCK_TIME_IS_VALID (time))
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return g_strdup ("");
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hours = (guint) (time / (GST_SECOND * 60 * 60));
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mins = (guint) ((time / (GST_SECOND * 60)) % 60);
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secs = (guint) ((time / GST_SECOND) % 60);
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msecs = (guint) ((time % GST_SECOND) / (1000 * 1000));
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return g_strdup_printf ("%u:%02u:%02u.%03u", hours, mins, secs, msecs);
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}
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/* Called with lock held */
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static gchar *
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gst_time_overlay_get_text (GstBaseTextOverlay * overlay,
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GstBuffer * video_frame)
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{
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GstClockTime time = GST_BUFFER_TIMESTAMP (video_frame);
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gchar *time_str, *txt, *ret;
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overlay->need_render = TRUE;
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if (!GST_CLOCK_TIME_IS_VALID (time)) {
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GST_DEBUG ("buffer without valid timestamp");
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return g_strdup ("");
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}
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GST_DEBUG ("buffer with timestamp %" GST_TIME_FORMAT, GST_TIME_ARGS (time));
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txt = g_strdup (overlay->default_text);
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time_str = gst_time_overlay_render_time (GST_TIME_OVERLAY (overlay), time);
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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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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_time_overlay_class_init (GstTimeOverlayClass * klass)
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{
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GstElementClass *gstelement_class;
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GstBaseTextOverlayClass *gsttextoverlay_class;
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PangoContext *context;
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PangoFontDescription *font_description;
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gsttextoverlay_class = (GstBaseTextOverlayClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gst_element_class_set_details_simple (gstelement_class, "Time overlay",
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"Filter/Editor/Video",
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"Overlays buffer time stamps on a video stream",
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"Tim-Philipp Müller <tim@centricular.net>");
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gsttextoverlay_class->get_text = gst_time_overlay_get_text;
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g_mutex_lock (gsttextoverlay_class->pango_lock);
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context = gsttextoverlay_class->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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g_mutex_unlock (gsttextoverlay_class->pango_lock);
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}
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static void
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gst_time_overlay_init (GstTimeOverlay * overlay)
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{
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GstBaseTextOverlay *textoverlay;
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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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}
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