gstreamer/gst/gaudieffects/gstgaussblur.c
2021-04-11 16:16:55 +00:00

456 lines
13 KiB
C

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