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/* GStreamer
* Copyright (C) 2011 David Schleef <ds@entropywave.com>
*
* 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., 51 Franklin Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-gstzebrastripe
*
* The zebrastripe element marks areas of images in a video stream
* that are brighter than a threshold with a diagonal zebra stripe
* pattern. Typically, this is used to aid in adjusting the exposure
* setting on the camera. Setting the threshold to 95 or 100 will
* show areas that are completely overexposed and clipping. A
* threshold setting of 70 is often used to properly adjust skin
* tones.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! zebrastripe ! xvimagesink
* ]|
* Marks overexposed areas of the video with zebra stripes.
*
* The threshold property is expressed as percentage of full scale,
* whereas common usage expresses thresholds in terms of IRE. The
* property setting can be calculated from IRE by using the formula
* percent = (IRE * 1.075) - 7.5. Note that 100 IRE corresponds to
* 100 %, and 70 IRE corresponds to 68 %.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include <gst/video/video.h>
#include <math.h>
#include "gstzebrastripe.h"
GST_DEBUG_CATEGORY_STATIC (gst_zebra_stripe_debug_category);
#define GST_CAT_DEFAULT gst_zebra_stripe_debug_category
/* prototypes */
static void gst_zebra_stripe_set_property (GObject * object,
guint property_id, const GValue * value, GParamSpec * pspec);
static void gst_zebra_stripe_get_property (GObject * object,
guint property_id, GValue * value, GParamSpec * pspec);
static void gst_zebra_stripe_finalize (GObject * object);
static gboolean gst_zebra_stripe_start (GstBaseTransform * trans);
static gboolean gst_zebra_stripe_stop (GstBaseTransform * trans);
static GstFlowReturn
gst_zebra_stripe_prefilter (GstVideoFilter2 * videofilter2, GstBuffer * buf);
static GstVideoFilter2Functions gst_zebra_stripe_filter_functions[];
enum
{
PROP_0,
PROP_THRESHOLD
};
#define DEFAULT_THRESHOLD 90
/* class initialization */
#define DEBUG_INIT(bla) \
GST_DEBUG_CATEGORY_INIT (gst_zebra_stripe_debug_category, "zebrastripe", 0, \
"debug category for zebrastripe element");
GST_BOILERPLATE_FULL (GstZebraStripe, gst_zebra_stripe, GstVideoFilter2,
GST_TYPE_VIDEO_FILTER2, DEBUG_INIT);
static void
gst_zebra_stripe_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "Zebra stripe overlay",
"Filter/Analysis",
"Overlays zebra striping on overexposed areas of video",
"David Schleef <ds@entropywave.com>");
}
static void
gst_zebra_stripe_class_init (GstZebraStripeClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstVideoFilter2Class *video_filter2_class = GST_VIDEO_FILTER2_CLASS (klass);
GstBaseTransformClass *base_transform_class =
GST_BASE_TRANSFORM_CLASS (klass);
gobject_class->set_property = gst_zebra_stripe_set_property;
gobject_class->get_property = gst_zebra_stripe_get_property;
gobject_class->finalize = gst_zebra_stripe_finalize;
base_transform_class->start = GST_DEBUG_FUNCPTR (gst_zebra_stripe_start);
base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_zebra_stripe_stop);
video_filter2_class->prefilter =
GST_DEBUG_FUNCPTR (gst_zebra_stripe_prefilter);
g_object_class_install_property (gobject_class, PROP_THRESHOLD,
g_param_spec_int ("threshold", "Threshold",
"Threshold above which the video is striped", 0, 100,
DEFAULT_THRESHOLD,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
gst_video_filter2_class_add_functions (video_filter2_class,
gst_zebra_stripe_filter_functions);
}
static void
gst_zebra_stripe_init (GstZebraStripe * zebrastripe,
GstZebraStripeClass * zebrastripe_class)
{
}
void
gst_zebra_stripe_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec)
{
GstZebraStripe *zebrastripe;
g_return_if_fail (GST_IS_ZEBRA_STRIPE (object));
zebrastripe = GST_ZEBRA_STRIPE (object);
switch (property_id) {
case PROP_THRESHOLD:
zebrastripe->threshold = g_value_get_int (value);
zebrastripe->y_threshold =
16 + floor (0.5 + 2.19 * zebrastripe->threshold);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_zebra_stripe_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstZebraStripe *zebrastripe;
g_return_if_fail (GST_IS_ZEBRA_STRIPE (object));
zebrastripe = GST_ZEBRA_STRIPE (object);
switch (property_id) {
case PROP_THRESHOLD:
g_value_set_int (value, zebrastripe->threshold);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
void
gst_zebra_stripe_finalize (GObject * object)
{
g_return_if_fail (GST_IS_ZEBRA_STRIPE (object));
/* clean up object here */
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_zebra_stripe_start (GstBaseTransform * trans)
{
return TRUE;
}
static gboolean
gst_zebra_stripe_stop (GstBaseTransform * trans)
{
return TRUE;
}
static GstFlowReturn
gst_zebra_stripe_prefilter (GstVideoFilter2 * videofilter2, GstBuffer * buf)
{
GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (videofilter2);
zebrastripe->t++;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_zebra_stripe_filter_ip_planarY (GstVideoFilter2 * videofilter2,
GstBuffer * buf, int start, int end)
{
GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (videofilter2);
int width = GST_VIDEO_FILTER2_WIDTH (zebrastripe);
int i, j;
int threshold = zebrastripe->y_threshold;
int t = zebrastripe->t;
guint8 *ydata;
int ystride;
ydata = GST_BUFFER_DATA (buf);
ystride =
gst_video_format_get_row_stride (GST_VIDEO_FILTER2_FORMAT (videofilter2),
0, width);
for (j = start; j < end; j++) {
guint8 *data = ydata + ystride * j;
for (i = 0; i < width; i++) {
if (data[i] >= threshold) {
if ((i + j + t) & 0x4)
data[i] = 16;
}
}
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_zebra_stripe_filter_ip_YxYy (GstVideoFilter2 * videofilter2,
GstBuffer * buf, int start, int end)
{
GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (videofilter2);
GstVideoFormat format = GST_VIDEO_FILTER2_FORMAT (zebrastripe);
int width = GST_VIDEO_FILTER2_WIDTH (zebrastripe);
int i, j;
int threshold = zebrastripe->y_threshold;
int t = zebrastripe->t;
guint8 *ydata;
int ystride;
ydata = GST_BUFFER_DATA (buf);
ystride = gst_video_format_get_row_stride (format, 0, width);
if (format == GST_VIDEO_FORMAT_UYVY) {
ydata++;
}
for (j = start; j < end; j++) {
guint8 *data = ydata + ystride * j;
for (i = 0; i < width; i++) {
if (data[2 * i] >= threshold) {
if ((i + j + t) & 0x4)
data[2 * i] = 16;
}
}
}
return GST_FLOW_OK;
}
static GstFlowReturn
gst_zebra_stripe_filter_ip_AYUV (GstVideoFilter2 * videofilter2,
GstBuffer * buf, int start, int end)
{
GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (videofilter2);
int width = GST_VIDEO_FILTER2_WIDTH (zebrastripe);
int i, j;
int threshold = zebrastripe->y_threshold;
int t = zebrastripe->t;
guint8 *ydata;
int ystride;
ydata = GST_BUFFER_DATA (buf);
ystride =
gst_video_format_get_row_stride (GST_VIDEO_FILTER2_FORMAT (videofilter2),
0, width);
ydata++;
for (j = start; j < end; j++) {
guint8 *data = ydata + ystride * j;
for (i = 0; i < width; i++) {
if (data[4 * i] >= threshold) {
if ((i + j + t) & 0x4)
data[4 * i] = 16;
}
}
}
return GST_FLOW_OK;
}
static GstVideoFilter2Functions gst_zebra_stripe_filter_functions[] = {
{GST_VIDEO_FORMAT_I420, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_YV12, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_Y41B, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_Y42B, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_NV12, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_NV21, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_YUV9, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_YVU9, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_Y444, NULL, gst_zebra_stripe_filter_ip_planarY},
{GST_VIDEO_FORMAT_UYVY, NULL, gst_zebra_stripe_filter_ip_YxYy},
{GST_VIDEO_FORMAT_YUY2, NULL, gst_zebra_stripe_filter_ip_YxYy},
{GST_VIDEO_FORMAT_YVYU, NULL, gst_zebra_stripe_filter_ip_YxYy},
{GST_VIDEO_FORMAT_AYUV, NULL, gst_zebra_stripe_filter_ip_AYUV},
{GST_VIDEO_FORMAT_UNKNOWN}
};