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/* GStreamer
* Copyright (C) 2009 Benjamin Otte <otte@gnome.org>
*
* 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-pango_time_overlay
*
* Convert video frames between a great variety of colorspace formats.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! video/x-raw-yuv,format=\(fourcc\)YUY2 ! pango_time_overlay ! ximagesink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstpangotimeoverlay.h"
#include <pango/pangocairo.h>
GST_BOILERPLATE (GstPangoTimeOverlay, gst_pango_time_overlay, GstElement,
GST_TYPE_BASE_TRANSFORM);
static gboolean
gst_pango_time_overlay_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstPangoTimeOverlay *overlay = GST_PANGO_TIME_OVERLAY (btrans);
GstCairoFormat *compare;
gboolean equal;
gst_cairo_format_free (overlay->format);
overlay->format = gst_cairo_format_new (incaps);
compare = gst_cairo_format_new (outcaps);
equal = gst_cairo_format_equal (overlay->format, compare, 0);
gst_cairo_format_free (compare);
return equal;
}
static gboolean
gst_pango_time_overlay_get_unit_size (GstBaseTransform * btrans, GstCaps * caps,
guint * size)
{
GstCairoFormat *format;
format = gst_cairo_format_new (caps);
*size = gst_cairo_format_get_buffer_size (format);
gst_cairo_format_free (format);
return TRUE;
}
static gchar *
gst_pango_time_overlay_format_time (GstClockTime clocktime)
{
guint hours, mins, secs, msecs;
if (!GST_CLOCK_TIME_IS_VALID (clocktime))
return g_strdup ("");
hours = (guint) (clocktime / (GST_SECOND * 60 * 60));
mins = (guint) ((clocktime / (GST_SECOND * 60)) % 60);
secs = (guint) ((clocktime / GST_SECOND) % 60);
msecs = (guint) ((clocktime % GST_SECOND) / (1000 * 1000));
return g_strdup_printf ("%u:%02u:%02u.%03u", hours, mins, secs, msecs);
}
static GstFlowReturn
gst_pango_time_overlay_transform_ip (GstBaseTransform * btrans, GstBuffer * buf)
{
GstPangoTimeOverlay *overlay = GST_PANGO_TIME_OVERLAY (btrans);
PangoLayout *layout;
cairo_surface_t *surface;
cairo_t *cr;
char *time_text;
surface = gst_cairo_create_surface (buf, overlay->format);
cr = cairo_create (surface);
layout = pango_cairo_create_layout (cr);
pango_layout_set_width (layout,
gst_cairo_format_get_width (overlay->format) * PANGO_SCALE);
pango_layout_set_alignment (layout, PANGO_ALIGN_RIGHT);
time_text = gst_pango_time_overlay_format_time (GST_BUFFER_TIMESTAMP (buf));
pango_layout_set_text (layout, time_text, -1);
g_free (time_text);
cairo_translate (cr, 1, 1);
cairo_set_source_rgb (cr, 0, 0, 0);
pango_cairo_show_layout (cr, layout);
cairo_translate (cr, -1, -1);
cairo_set_source_rgb (cr, 1, 1, 1);
pango_cairo_show_layout (cr, layout);
g_object_unref (layout);
cairo_destroy (cr);
cairo_surface_destroy (surface);
return GST_FLOW_OK;
}
static gboolean
gst_pango_time_overlay_stop (GstBaseTransform * btrans)
{
GstPangoTimeOverlay *overlay = GST_PANGO_TIME_OVERLAY (btrans);
gst_cairo_format_free (overlay->format);
overlay->format = NULL;
return TRUE;
}
static void
gst_pango_time_overlay_base_init (gpointer klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gst_element_class_add_pad_template (element_class,
gst_cairo_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS));
gst_element_class_add_pad_template (element_class,
gst_cairo_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS));
gst_element_class_set_details_simple (element_class, "Time overlay",
"Filter/Editor/Video",
"Overlays buffer time stamps on a video stream",
"Benjamin Otte <otte@gnome.org>");
}
static void
gst_pango_time_overlay_class_init (GstPangoTimeOverlayClass * klass)
{
GstBaseTransformClass *basetransform_class = GST_BASE_TRANSFORM_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
basetransform_class->set_caps = gst_pango_time_overlay_set_caps;
basetransform_class->get_unit_size = gst_pango_time_overlay_get_unit_size;
basetransform_class->transform_ip = gst_pango_time_overlay_transform_ip;
basetransform_class->stop = gst_pango_time_overlay_stop;
basetransform_class->passthrough_on_same_caps = TRUE;
}
static void
gst_pango_time_overlay_init (GstPangoTimeOverlay * overlay,
GstPangoTimeOverlayClass * klass)
{
gst_base_transform_set_qos_enabled (GST_BASE_TRANSFORM (overlay), TRUE);
}
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