author | Pat Downey <patd@symbian.org> |
Wed, 01 Sep 2010 12:16:41 +0100 | |
branch | RCL_3 |
changeset 30 | 7e817e7e631c |
parent 0 | 0e761a78d257 |
permissions | -rw-r--r-- |
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/* 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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/** |
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* SECTION:element-clockoverlay |
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* @see_also: #GstTextOverlay, #GstTimeOverlay |
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* |
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* <refsect2> |
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* <para> |
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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 the properties of the #GstTextOverlay class. By default, the |
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* 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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* </para> |
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* <para> |
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* Here is a simple pipeline that displays the current time in the top left |
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* corner of the video picture: |
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* <programlisting> |
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* gst-launch -v videotestsrc ! clockoverlay ! xvimagesink |
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* </programlisting> |
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* </para> |
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* <para> |
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* Here is 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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* <programlisting> |
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* gst-launch -v videotestsrc ! clockoverlay halign=right valign=bottom text="Edge City" shaded-background=true ! ffmpegcolorspace ! ximagesink |
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* </programlisting> |
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* </para> |
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* </refsect2> |
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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 <gstclockoverlay.h> |
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#include <gst/video/video.h> |
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#include <time.h> |
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|
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static const GstElementDetails clock_overlay_details = |
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GST_ELEMENT_DETAILS ("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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|
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GST_BOILERPLATE (GstClockOverlay, gst_clock_overlay, GstTextOverlay, |
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GST_TYPE_TEXT_OVERLAY) |
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|
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static void gst_clock_overlay_base_init (gpointer g_class) |
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{ |
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); |
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gst_element_class_set_details (element_class, &clock_overlay_details); |
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} |
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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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struct tm *t; |
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time_t now; |
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#ifdef HAVE_LOCALTIME_R |
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struct tm dummy; |
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#endif |
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now = time (NULL); |
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#ifdef HAVE_LOCALTIME_R |
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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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return g_strdup_printf ("%02u:%02u:%02u", t->tm_hour, t->tm_min, t->tm_sec); |
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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 (GstTextOverlay * overlay, GstBuffer * video_frame) |
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104 |
{ |
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gchar *time_str, *txt, *ret; |
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106 |
|
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overlay->need_render = TRUE; |
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108 |
|
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txt = g_strdup (overlay->default_text); |
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110 |
|
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time_str = gst_clock_overlay_render_time (GST_CLOCK_OVERLAY (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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118 |
|
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g_free (txt); |
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g_free (time_str); |
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121 |
|
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return ret; |
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} |
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124 |
|
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static void |
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gst_clock_overlay_class_init (GstClockOverlayClass * klass) |
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127 |
{ |
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GstTextOverlayClass *gsttextoverlay_class; |
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129 |
|
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gsttextoverlay_class = (GstTextOverlayClass *) klass; |
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131 |
|
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gsttextoverlay_class->get_text = gst_clock_overlay_get_text; |
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} |
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134 |
|
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static void |
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gst_clock_overlay_init (GstClockOverlay * overlay, GstClockOverlayClass * klass) |
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137 |
{ |
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PangoFontDescription *font_description; |
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GstTextOverlay *textoverlay; |
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PangoContext *context; |
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141 |
|
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textoverlay = GST_TEXT_OVERLAY (overlay); |
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143 |
|
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context = GST_TEXT_OVERLAY_CLASS (klass)->pango_context; |
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145 |
|
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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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148 |
|
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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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textoverlay->valign = GST_TEXT_OVERLAY_VALIGN_TOP; |
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textoverlay->halign = GST_TEXT_OVERLAY_HALIGN_LEFT; |
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} |