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451 lines
13 KiB
C
451 lines
13 KiB
C
/*
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* GStreamer
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* Copyright (C) <2010> Jan Schmidt <thaytan@noraisin.net>
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* Copyright (C) <2012> Luis de Bethencourt <luis@debethencourt.com>
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*
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* Chromium - burning chrome video effect.
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* Based on Pete Warden's FreeFrame plugin with the same name.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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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 St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-gaussianblur
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* @title: gaussianblur
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*
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* Gaussianblur blurs the video stream in realtime.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc ! gaussianblur ! videoconvert ! autovideosink
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* ]| This pipeline shows the effect of gaussianblur on a test stream
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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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#include <string.h>
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#endif
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#include <math.h>
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#include <gst/gst.h>
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#include "gstgaussblur.h"
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static void gst_gaussianblur_finalize (GObject * object);
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static gboolean gst_gaussianblur_set_info (GstVideoFilter * filter,
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GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
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GstVideoInfo * out_info);
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static GstFlowReturn gst_gaussianblur_transform_frame (GstVideoFilter * vfilter,
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GstVideoFrame * in_frame, GstVideoFrame * out_frame);
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static void gst_gaussianblur_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_gaussianblur_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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GST_DEBUG_CATEGORY_STATIC (gst_gauss_blur_debug);
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#define GST_CAT_DEFAULT gst_gauss_blur_debug
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#define CAPS_STR GST_VIDEO_CAPS_MAKE ("AYUV")
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/* The capabilities of the inputs and outputs. */
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static GstStaticPadTemplate gst_gaussianblur_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (CAPS_STR)
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);
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static GstStaticPadTemplate gst_gaussianblur_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS (CAPS_STR)
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);
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enum
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{
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PROP_0,
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PROP_SIGMA
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};
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static gboolean make_gaussian_kernel (GstGaussianBlur * gb, float sigma);
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static void gaussian_smooth (GstGaussianBlur * gb, guint8 * image,
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guint8 * out_image);
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#define gst_gaussianblur_parent_class parent_class
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G_DEFINE_TYPE (GstGaussianBlur, gst_gaussianblur, GST_TYPE_VIDEO_FILTER);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (gaussianblur, "gaussianblur",
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GST_RANK_NONE, GST_TYPE_GAUSSIANBLUR,
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GST_DEBUG_CATEGORY_INIT (gst_gauss_blur_debug, "gaussianblur", 0,
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"Gaussian Blur video effect"));
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#define DEFAULT_SIGMA 1.2
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/* Initialize the gaussianblur's class. */
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static void
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gst_gaussianblur_class_init (GstGaussianBlurClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstElementClass *gstelement_class = (GstElementClass *) klass;
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GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
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gst_element_class_set_static_metadata (gstelement_class,
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"GstGaussianBlur",
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"Filter/Effect/Video",
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"Perform Gaussian blur/sharpen on a video",
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"Jan Schmidt <thaytan@noraisin.net>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_gaussianblur_sink_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_gaussianblur_src_template);
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gobject_class->set_property = gst_gaussianblur_set_property;
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gobject_class->get_property = gst_gaussianblur_get_property;
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_gaussianblur_finalize);
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g_object_class_install_property (gobject_class, PROP_SIGMA,
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g_param_spec_double ("sigma", "Sigma",
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"Sigma value for gaussian blur (negative for sharpen)",
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-20.0, 20.0, DEFAULT_SIGMA,
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G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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vfilter_class->transform_frame =
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GST_DEBUG_FUNCPTR (gst_gaussianblur_transform_frame);
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vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_gaussianblur_set_info);
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}
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static gboolean
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gst_gaussianblur_set_info (GstVideoFilter * filter, GstCaps * incaps,
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GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
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{
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GstGaussianBlur *gb = GST_GAUSSIANBLUR (filter);
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guint32 n_elems;
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gb->width = GST_VIDEO_INFO_WIDTH (in_info);
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gb->height = GST_VIDEO_INFO_HEIGHT (in_info);
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/* get stride */
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gb->stride = GST_VIDEO_INFO_COMP_STRIDE (in_info, 0);
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n_elems = gb->stride * gb->height;
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g_free (gb->tempim);
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gb->tempim = g_malloc (sizeof (gfloat) * n_elems);
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return TRUE;
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}
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static void
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gst_gaussianblur_init (GstGaussianBlur * gb)
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{
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gb->sigma = (gfloat) DEFAULT_SIGMA;
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gb->cur_sigma = -1.0;
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}
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static void
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gst_gaussianblur_finalize (GObject * object)
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{
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GstGaussianBlur *gb = GST_GAUSSIANBLUR (object);
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g_free (gb->tempim);
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gb->tempim = NULL;
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g_free (gb->smoothedim);
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gb->smoothedim = NULL;
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g_free (gb->kernel);
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gb->kernel = NULL;
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g_free (gb->kernel_sum);
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gb->kernel_sum = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static GstFlowReturn
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gst_gaussianblur_transform_frame (GstVideoFilter * vfilter,
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GstVideoFrame * in_frame, GstVideoFrame * out_frame)
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{
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GstGaussianBlur *filter = GST_GAUSSIANBLUR (vfilter);
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GstClockTime timestamp;
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gint64 stream_time;
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gfloat sigma;
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guint8 *src, *dest;
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/* GstController: update the properties */
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timestamp = GST_BUFFER_TIMESTAMP (in_frame->buffer);
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stream_time =
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gst_segment_to_stream_time (&GST_BASE_TRANSFORM (filter)->segment,
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GST_FORMAT_TIME, timestamp);
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GST_DEBUG_OBJECT (filter, "sync to %" GST_TIME_FORMAT,
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GST_TIME_ARGS (timestamp));
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if (GST_CLOCK_TIME_IS_VALID (stream_time))
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gst_object_sync_values (GST_OBJECT (filter), stream_time);
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GST_OBJECT_LOCK (filter);
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sigma = filter->sigma;
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GST_OBJECT_UNLOCK (filter);
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if (filter->cur_sigma != sigma) {
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g_free (filter->kernel);
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filter->kernel = NULL;
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g_free (filter->kernel_sum);
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filter->kernel_sum = NULL;
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filter->cur_sigma = sigma;
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}
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if (filter->kernel == NULL &&
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!make_gaussian_kernel (filter, filter->cur_sigma)) {
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GST_ELEMENT_ERROR (filter, RESOURCE, NO_SPACE_LEFT, ("Out of memory"),
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("Failed to allocation gaussian kernel"));
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return GST_FLOW_ERROR;
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}
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/*
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* Perform gaussian smoothing on the image using the input standard
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* deviation.
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*/
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src = GST_VIDEO_FRAME_COMP_DATA (in_frame, 0);
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dest = GST_VIDEO_FRAME_COMP_DATA (out_frame, 0);
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gst_video_frame_copy (out_frame, in_frame);
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if (filter->sigma != 0.0)
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gaussian_smooth (filter, src, dest);
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return GST_FLOW_OK;
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}
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static void
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blur_row_x (GstGaussianBlur * gb, guint8 * in_row, gfloat * out_row)
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{
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int c, cc, center;
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float dot[4], sum;
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int k, kmin, kmax;
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center = gb->windowsize / 2;
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for (c = 0; c < gb->width; c++) {
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/* Calculate min */
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cc = center - c;
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kmin = MAX (0, cc);
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cc = kmin - cc;
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/* Calc max */
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kmax = MIN (gb->windowsize, gb->width - cc);
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cc *= 4;
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dot[0] = dot[1] = dot[2] = dot[3] = 0.0;
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/* Calculate sum for range */
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sum = gb->kernel_sum[kmax - 1];
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sum -= kmin ? gb->kernel_sum[kmin - 1] : 0.0;
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for (k = kmin; k < kmax; k++) {
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float coeff = gb->kernel[k];
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dot[0] += (float) in_row[cc++] * coeff;
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dot[1] += (float) in_row[cc++] * coeff;
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dot[2] += (float) in_row[cc++] * coeff;
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dot[3] += (float) in_row[cc++] * coeff;
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}
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out_row[c * 4] = dot[0] / sum;
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out_row[c * 4 + 1] = dot[1] / sum;
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out_row[c * 4 + 2] = dot[2] / sum;
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out_row[c * 4 + 3] = dot[3] / sum;
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}
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}
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static void
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gaussian_smooth (GstGaussianBlur * gb, guint8 * image, guint8 * out_image)
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{
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int r, c, rr, center;
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float dot[4], sum;
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int k, kmin, kmax;
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guint8 *in_row = image;
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float *tmp_out_row = gb->tempim;
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float *tmp_in_pos;
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gint y_avail = 0;
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guint8 *out_row;
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/* Apply the gaussian kernel */
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center = gb->windowsize / 2;
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/* Blur in the y - direction. */
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for (r = 0; r < gb->height; r++) {
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/* Calculate input row range */
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rr = center - r;
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kmin = MAX (0, rr);
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rr = kmin - rr;
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/* Calc max */
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kmax = MIN (gb->windowsize, gb->height - rr);
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/* Precalculate sum for range */
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sum = gb->kernel_sum[kmax - 1];
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sum -= kmin ? gb->kernel_sum[kmin - 1] : 0.0;
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/* Blur more input rows (x direction blur) */
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while (y_avail <= (r + center) && y_avail < gb->height) {
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blur_row_x (gb, in_row, tmp_out_row);
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in_row += gb->stride;
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tmp_out_row += gb->stride;
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y_avail++;
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}
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tmp_in_pos = gb->tempim + (rr * gb->stride);
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out_row = out_image + r * gb->stride;
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for (c = 0; c < gb->width; c++) {
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float *tmp = tmp_in_pos;
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dot[0] = dot[1] = dot[2] = dot[3] = 0.0;
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for (k = kmin; k < kmax; k++, tmp += gb->stride) {
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float kern = gb->kernel[k];
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dot[0] += tmp[0] * kern;
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dot[1] += tmp[1] * kern;
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dot[2] += tmp[2] * kern;
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dot[3] += tmp[3] * kern;
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}
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*out_row++ = (guint8) CLAMP ((dot[0] / sum + 0.5), 0, 255);
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*out_row++ = (guint8) CLAMP ((dot[1] / sum + 0.5), 0, 255);
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*out_row++ = (guint8) CLAMP ((dot[2] / sum + 0.5), 0, 255);
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*out_row++ = (guint8) CLAMP ((dot[3] / sum + 0.5), 0, 255);
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tmp_in_pos += 4;
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}
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}
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}
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/*
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* Create a one dimensional gaussian kernel.
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*/
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static gboolean
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make_gaussian_kernel (GstGaussianBlur * gb, float sigma)
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{
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int i, center, left, right;
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float sum, sum2;
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const float fe = -0.5 / (sigma * sigma);
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const float dx = 1.0 / (sigma * sqrt (2 * G_PI));
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center = ceil (2.5 * fabs (sigma));
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gb->windowsize = (int) (1 + 2 * center);
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gb->kernel = g_new (float, gb->windowsize);
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gb->kernel_sum = g_new (float, gb->windowsize);
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if (gb->kernel == NULL || gb->kernel_sum == NULL)
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return FALSE;
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if (gb->windowsize == 1) {
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gb->kernel[0] = 1.0;
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gb->kernel_sum[0] = 1.0;
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return TRUE;
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}
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/* Center co-efficient */
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sum = gb->kernel[center] = dx;
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/* Other coefficients */
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left = center - 1;
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right = center + 1;
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for (i = 1; i <= center; i++, left--, right++) {
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float fx = dx * pow (G_E, fe * i * i);
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gb->kernel[right] = gb->kernel[left] = fx;
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sum += 2 * fx;
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}
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if (sigma < 0) {
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sum = -sum;
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gb->kernel[center] += 2.0 * sum;
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}
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for (i = 0; i < gb->windowsize; i++)
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gb->kernel[i] /= sum;
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sum2 = 0.0;
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for (i = 0; i < gb->windowsize; i++) {
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sum2 += gb->kernel[i];
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gb->kernel_sum[i] = sum2;
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}
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#if 0
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g_print ("Sigma %f: ", sigma);
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for (i = 0; i < gb->windowsize; i++)
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g_print ("%f ", gb->kernel[i]);
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g_print ("\n");
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g_print ("sums: ");
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for (i = 0; i < gb->windowsize; i++)
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g_print ("%f ", gb->kernel_sum[i]);
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g_print ("\n");
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g_print ("sum %f sum2 %f\n", sum, sum2);
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#endif
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return TRUE;
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}
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static void
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gst_gaussianblur_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstGaussianBlur *gb = GST_GAUSSIANBLUR (object);
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switch (prop_id) {
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case PROP_SIGMA:
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GST_OBJECT_LOCK (object);
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gb->sigma = g_value_get_double (value);
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GST_OBJECT_UNLOCK (object);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_gaussianblur_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstGaussianBlur *gb = GST_GAUSSIANBLUR (object);
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switch (prop_id) {
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case PROP_SIGMA:
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GST_OBJECT_LOCK (gb);
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g_value_set_double (value, gb->sigma);
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GST_OBJECT_UNLOCK (gb);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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