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251 lines
7.7 KiB
C
251 lines
7.7 KiB
C
/* GStreamer
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* Copyright (C) 2011 David Schleef <ds@entropywave.com>
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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., 51 Franklin Street, Suite 500,
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* Boston, MA 02110-1335, USA.
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*/
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/**
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* SECTION:element-gstzebrastripe
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*
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* The zebrastripe element marks areas of images in a video stream
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* that are brighter than a threshold with a diagonal zebra stripe
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* pattern. Typically, this is used to aid in adjusting the exposure
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* setting on the camera. Setting the threshold to 95 or 100 will
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* show areas that are completely overexposed and clipping. A
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* threshold setting of 70 is often used to properly adjust skin
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* tones.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch -v videotestsrc ! zebrastripe ! xvimagesink
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* ]|
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* Marks overexposed areas of the video with zebra stripes.
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*
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* The threshold property is expressed as percentage of full scale,
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* whereas common usage expresses thresholds in terms of IRE. The
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* property setting can be calculated from IRE by using the formula
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* percent = (IRE * 1.075) - 7.5. Note that 100 IRE corresponds to
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* 100 %, and 70 IRE corresponds to 68 %.
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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/gst.h>
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#include <gst/video/video.h>
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#include <gst/video/gstvideofilter.h>
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#include "gstzebrastripe.h"
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#include <math.h>
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GST_DEBUG_CATEGORY_STATIC (gst_zebra_stripe_debug_category);
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#define GST_CAT_DEFAULT gst_zebra_stripe_debug_category
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/* prototypes */
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static void gst_zebra_stripe_set_property (GObject * object,
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guint property_id, const GValue * value, GParamSpec * pspec);
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static void gst_zebra_stripe_get_property (GObject * object,
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guint property_id, GValue * value, GParamSpec * pspec);
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static gboolean gst_zebra_stripe_start (GstBaseTransform * trans);
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static gboolean gst_zebra_stripe_stop (GstBaseTransform * trans);
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static GstFlowReturn gst_zebra_stripe_transform_frame_ip (GstVideoFilter *
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filter, GstVideoFrame * frame);
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enum
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{
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PROP_0,
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PROP_THRESHOLD
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};
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#define DEFAULT_THRESHOLD 90
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/* pad templates */
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#define VIDEO_CAPS GST_VIDEO_CAPS_MAKE( \
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"{ I420, Y444, Y42B, Y41B, YUY2, UYVY, AYUV, NV12, NV21, YV12 }")
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/* class initialization */
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G_DEFINE_TYPE_WITH_CODE (GstZebraStripe, gst_zebra_stripe,
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GST_TYPE_VIDEO_FILTER,
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GST_DEBUG_CATEGORY_INIT (gst_zebra_stripe_debug_category, "zebrastripe", 0,
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"debug category for zebrastripe element"));
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static void
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gst_zebra_stripe_class_init (GstZebraStripeClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstBaseTransformClass *base_transform_class =
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GST_BASE_TRANSFORM_CLASS (klass);
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GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);
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/* Setting up pads and setting metadata should be moved to
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base_class_init if you intend to subclass this class. */
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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gst_caps_from_string (VIDEO_CAPS)));
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gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
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gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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gst_caps_from_string (VIDEO_CAPS)));
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gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
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"Zebra stripe overlay",
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"Filter/Analysis",
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"Overlays zebra striping on overexposed areas of video",
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"David Schleef <ds@entropywave.com>");
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gobject_class->set_property = gst_zebra_stripe_set_property;
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gobject_class->get_property = gst_zebra_stripe_get_property;
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base_transform_class->start = GST_DEBUG_FUNCPTR (gst_zebra_stripe_start);
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base_transform_class->stop = GST_DEBUG_FUNCPTR (gst_zebra_stripe_stop);
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video_filter_class->transform_frame_ip =
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GST_DEBUG_FUNCPTR (gst_zebra_stripe_transform_frame_ip);
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g_object_class_install_property (gobject_class, PROP_THRESHOLD,
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g_param_spec_int ("threshold", "Threshold",
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"Threshold above which the video is striped", 0, 100,
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DEFAULT_THRESHOLD,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
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}
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static void
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gst_zebra_stripe_init (GstZebraStripe * zebrastripe)
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{
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}
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void
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gst_zebra_stripe_set_property (GObject * object, guint property_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (object);
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GST_DEBUG_OBJECT (zebrastripe, "set_property");
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switch (property_id) {
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case PROP_THRESHOLD:
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zebrastripe->threshold = g_value_get_int (value);
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zebrastripe->y_threshold =
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16 + floor (0.5 + 2.19 * zebrastripe->threshold);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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void
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gst_zebra_stripe_get_property (GObject * object, guint property_id,
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GValue * value, GParamSpec * pspec)
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{
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GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (object);
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GST_DEBUG_OBJECT (zebrastripe, "get_property");
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switch (property_id) {
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case PROP_THRESHOLD:
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g_value_set_int (value, zebrastripe->threshold);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static gboolean
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gst_zebra_stripe_start (GstBaseTransform * trans)
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{
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#ifndef GST_DISABLE_GST_DEBUG
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GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (trans);
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GST_DEBUG_OBJECT (zebrastripe, "start");
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#endif
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if (GST_BASE_TRANSFORM_CLASS (gst_zebra_stripe_parent_class)->start)
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return
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GST_BASE_TRANSFORM_CLASS (gst_zebra_stripe_parent_class)->start (trans);
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return TRUE;
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}
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static gboolean
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gst_zebra_stripe_stop (GstBaseTransform * trans)
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{
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#ifndef GST_DISABLE_GST_DEBUG
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GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (trans);
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GST_DEBUG_OBJECT (zebrastripe, "stop");
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#endif
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if (GST_BASE_TRANSFORM_CLASS (gst_zebra_stripe_parent_class)->stop)
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return
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GST_BASE_TRANSFORM_CLASS (gst_zebra_stripe_parent_class)->stop (trans);
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return TRUE;
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}
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static GstFlowReturn
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gst_zebra_stripe_transform_frame_ip (GstVideoFilter * filter,
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GstVideoFrame * frame)
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{
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GstZebraStripe *zebrastripe = GST_ZEBRA_STRIPE (filter);
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int width = frame->info.width;
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int height = frame->info.height;
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int i, j;
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int threshold = zebrastripe->y_threshold;
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int t = zebrastripe->t;
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int offset = 0;
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int pixel_stride = 0, y_position = 0;
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GST_DEBUG_OBJECT (zebrastripe, "transform_frame_ip");
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zebrastripe->t++;
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pixel_stride = GST_VIDEO_FORMAT_INFO_PSTRIDE (frame->info.finfo, 0);
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switch (frame->info.finfo->format) {
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case GST_VIDEO_FORMAT_I420:
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case GST_VIDEO_FORMAT_Y41B:
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case GST_VIDEO_FORMAT_Y444:
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case GST_VIDEO_FORMAT_Y42B:
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case GST_VIDEO_FORMAT_YUY2:
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case GST_VIDEO_FORMAT_NV12:
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case GST_VIDEO_FORMAT_NV21:
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case GST_VIDEO_FORMAT_YV12:
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break;
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case GST_VIDEO_FORMAT_UYVY:
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offset = 1;
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break;
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case GST_VIDEO_FORMAT_AYUV:
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y_position = 1;
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break;
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default:
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g_assert_not_reached ();
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}
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for (j = 0; j < height; j++) {
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guint8 *data =
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(guint8 *) frame->data[0] + frame->info.stride[0] * j + offset;
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for (i = 0; i < width; i++) {
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if (data[pixel_stride * i + y_position] >= threshold) {
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if ((i + j + t) & 0x4)
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data[pixel_stride * i + y_position] = 16;
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}
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}
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}
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return GST_FLOW_OK;
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}
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