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6bd90dc0cc
The textoverlay element will rerender the text string whenever overlay sets the 'need_render' flag to TRUE. Previously, we lazily set the flag to TRUE every time the time string was requested. Now, we save a copy of the previously given string, and only set 'need_render' to TRUE if the string has changed. In my tests with a 30fps video stream, and a time string including a seconds field, this change reduced the CPU usage of the clockoverlay element from 60% to 5%. Fixes bug #627780.
81 lines
2.5 KiB
C
81 lines
2.5 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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#ifndef __GST_CLOCK_OVERLAY_H__
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#define __GST_CLOCK_OVERLAY_H__
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#include "gsttextoverlay.h"
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G_BEGIN_DECLS
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#define GST_TYPE_CLOCK_OVERLAY \
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(gst_clock_overlay_get_type())
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#define GST_CLOCK_OVERLAY(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CLOCK_OVERLAY,GstClockOverlay))
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#define GST_CLOCK_OVERLAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CLOCK_OVERLAY,GstClockOverlayClass))
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#define GST_IS_CLOCK_OVERLAY(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CLOCK_OVERLAY))
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#define GST_IS_CLOCK_OVERLAY_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CLOCK_OVERLAY))
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typedef struct _GstClockOverlay GstClockOverlay;
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typedef struct _GstClockOverlayClass GstClockOverlayClass;
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/**
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* GstClockOverlay:
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*
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* Opaque clockoverlay data structure.
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*/
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struct _GstClockOverlay {
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GstTextOverlay textoverlay;
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gchar *format; /* as in strftime () */
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gchar *text;
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};
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struct _GstClockOverlayClass {
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GstTextOverlayClass parent_class;
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};
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GType gst_clock_overlay_get_type (void);
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/* This is a hack hat allows us to use nonliterals for strftime without
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* triggering a warning from -Wformat-nonliteral. We need to allow this
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* because we export the format string as a property of the element.
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* For the inspiration of this and a discussion of why this is necessary,
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* see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39438
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*/
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#ifdef __GNUC__
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#pragma GCC system_header
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static size_t my_strftime(char *s, size_t max, const char *format,
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const struct tm *tm)
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{
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return strftime (s, max, format, tm);
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}
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#define strftime my_strftime
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#endif
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G_END_DECLS
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#endif /* __GST_CLOCK_OVERLAY_H__ */
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