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/*
* GStreamer
* Copyright (C) <2010> 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-chromium
*
* Chromium breaks the colors of a video stream in realtime.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v videotestsrc ! chromium ! videoconvert ! autovideosink
* ]| This pipeline shows the effect of chromium on a test stream
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <math.h>
#include <gst/gst.h>
#include "gstplugin.h"
#include "gstchromium.h"
#define gst_chromium_parent_class parent_class
G_DEFINE_TYPE (GstChromium, gst_chromium, GST_TYPE_VIDEO_FILTER);
GST_DEBUG_CATEGORY_STATIC (gst_chromium_debug);
#define GST_CAT_DEFAULT gst_chromium_debug
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx }")
#else
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ xBGR, xRGB }")
#endif
/* Filter signals and args. */
enum
{
LAST_SIGNAL
};
enum
{
PROP_0 = 0,
PROP_EDGE_A,
PROP_EDGE_B,
};
/* Initializations */
#define DEFAULT_EDGE_A 200
#define DEFAULT_EDGE_B 1
const float pi = 3.141582f;
gint cosTablePi = 512;
gint cosTableTwoPi = (2 * 512);
gint cosTableOne = 512;
gint cosTableMask = 1023;
gint cosTable[2 * 512];
void setup_cos_table (void);
static gint cos_from_table (int angle);
static inline int abs_int (int val);
static void transform (guint32 * src, guint32 * dest, gint video_area,
gint edge_a, gint edge_b);
/* The capabilities of the inputs and outputs. */
static GstStaticPadTemplate gst_chromium_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static GstStaticPadTemplate gst_chromium_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static void gst_chromium_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_chromium_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_chromium_finalize (GObject * object);
static GstFlowReturn gst_chromium_transform_frame (GstVideoFilter * vfilter,
GstVideoFrame * in_frame, GstVideoFrame * out_frame);
/* GObject vmethod implementations */
/* Initialize the chromium's class. */
static void
gst_chromium_class_init (GstChromiumClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
gst_element_class_set_static_metadata (gstelement_class, "Chromium",
"Filter/Effect/Video",
"Chromium breaks the colors of the video signal.",
"Luis de Bethencourt <luis@debethencourt.com>");
gst_element_class_add_static_pad_template (gstelement_class,
&gst_chromium_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_chromium_src_template);
gobject_class->set_property = gst_chromium_set_property;
gobject_class->get_property = gst_chromium_get_property;
gobject_class->finalize = gst_chromium_finalize;
g_object_class_install_property (gobject_class, PROP_EDGE_A,
g_param_spec_uint ("edge-a", "Edge A",
"First edge parameter", 0, 256, DEFAULT_EDGE_A,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
g_object_class_install_property (gobject_class, PROP_EDGE_B,
g_param_spec_uint ("edge-b", "Edge B",
"Second edge parameter", 0, 256, DEFAULT_EDGE_B,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
vfilter_class->transform_frame =
GST_DEBUG_FUNCPTR (gst_chromium_transform_frame);
}
/* Initialize the element,
* instantiate pads and add them to element,
* set pad calback functions, and
* initialize instance structure.
*/
static void
gst_chromium_init (GstChromium * filter)
{
filter->edge_a = DEFAULT_EDGE_A;
filter->edge_b = DEFAULT_EDGE_B;
setup_cos_table ();
}
static void
gst_chromium_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstChromium *filter = GST_CHROMIUM (object);
switch (prop_id) {
case PROP_EDGE_A:
filter->edge_a = g_value_get_uint (value);
break;
case PROP_EDGE_B:
filter->edge_b = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_chromium_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstChromium *filter = GST_CHROMIUM (object);
GST_OBJECT_LOCK (filter);
switch (prop_id) {
case PROP_EDGE_A:
g_value_set_uint (value, filter->edge_a);
break;
case PROP_EDGE_B:
g_value_set_uint (value, filter->edge_b);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (filter);
}
static void
gst_chromium_finalize (GObject * object)
{
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* GstElement vmethod implementations */
/* Actual processing. */
static GstFlowReturn
gst_chromium_transform_frame (GstVideoFilter * vfilter,
GstVideoFrame * in_frame, GstVideoFrame * out_frame)
{
GstChromium *filter = GST_CHROMIUM (vfilter);
gint video_size, edge_a, edge_b;
guint32 *src, *dest;
GstClockTime timestamp;
gint64 stream_time;
src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
/* 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);
edge_a = filter->edge_a;
edge_b = filter->edge_b;
GST_OBJECT_UNLOCK (filter);
video_size = GST_VIDEO_FRAME_WIDTH (in_frame) *
GST_VIDEO_FRAME_HEIGHT (in_frame);
transform (src, dest, video_size, edge_a, edge_b);
return GST_FLOW_OK;
}
/* Entry point to initialize the plug-in.
* Register the element factories and other features. */
gboolean
gst_chromium_plugin_init (GstPlugin * chromium)
{
/* debug category for fltering log messages */
GST_DEBUG_CATEGORY_INIT (gst_chromium_debug, "chromium", 0,
"Template chromium");
return gst_element_register (chromium, "chromium", GST_RANK_NONE,
GST_TYPE_CHROMIUM);
}
/*** Now the image processing work.... ***/
/* Set up the cosine table. */
void
setup_cos_table (void)
{
int angle;
for (angle = 0; angle < cosTableTwoPi; ++angle) {
float angleInRadians = ((float) (angle) / cosTablePi) * pi;
cosTable[angle] = (int) (cos (angleInRadians) * cosTableOne);
}
}
/* Keep the values absolute. */
static inline int
abs_int (int val)
{
if (val > 0) {
return val;
} else {
return -val;
}
}
/* Cosine from Table. */
static gint
cos_from_table (int angle)
{
angle &= cosTableMask;
return cosTable[angle];
}
/* Transform processes each frame. */
static void
transform (guint32 * src, guint32 * dest, gint video_area,
gint edge_a, gint edge_b)
{
guint32 in;
gint x, red, green, blue;
for (x = 0; x < video_area; x++) {
in = *src++;
red = (in >> 16) & 0xff;
green = (in >> 8) & 0xff;
blue = (in) & 0xff;
red = abs_int (cos_from_table ((red + edge_a) + ((red * edge_b) / 2)));
green = abs_int (cos_from_table (
(green + edge_a) + ((green * edge_b) / 2)));
blue = abs_int (cos_from_table ((blue + edge_a) + ((blue * edge_b) / 2)));
red = CLAMP (red, 0, 255);
green = CLAMP (green, 0, 255);
blue = CLAMP (blue, 0, 255);
*dest++ = (red << 16) | (green << 8) | blue;
}
}