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