/* * GStreamer * Copyright (C) <2010-2012> 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-chromium * * Chromium breaks the colors of a video stream in realtime. * * <refsect2> * <title>Example launch line</title> * |[ * gst-launch -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, PROP_SILENT }; /* 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_pad_template (gstelement_class, gst_static_pad_template_get (&gst_chromium_sink_template)); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&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)); g_object_class_install_property (gobject_class, PROP_SILENT, g_param_spec_boolean ("silent", "Silent", "Produce verbose output ?", FALSE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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; filter->silent = FALSE; 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_SILENT: filter->silent = g_value_get_boolean (value); break; 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_SILENT: g_value_set_boolean (value, filter->silent); break; 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, width, height; 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); width = GST_VIDEO_FRAME_WIDTH (in_frame); height = GST_VIDEO_FRAME_HEIGHT (in_frame); /* 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 = width * height; 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; } }