253 lines
7.3 KiB
C
253 lines
7.3 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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*
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* EffecTV:
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* Copyright (C) 2001 FUKUCHI Kentarou
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*
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* EffecTV - Realtime Digital Video Effector
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* Copyright (C) 2001 FUKUCHI Kentarou
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*
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* revTV based on Rutt-Etra Video Synthesizer 1974?
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* (c)2002 Ed Tannenbaum
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*
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* This effect acts like a waveform monitor on each line.
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* It was originally done by deflecting the electron beam on a monitor using
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* additional electromagnets on the yoke of a b/w CRT.
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* Here it is emulated digitally.
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* Experimaental tapes were made with this system by Bill and
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* Louise Etra and Woody and Steina Vasulka
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* The line spacing can be controlled using the 1 and 2 Keys.
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* The gain is controlled using the 3 and 4 keys.
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* The update rate is controlled using the 0 and - keys.
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* EffecTV is free software. This library is free software;
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* 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-revtv
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* @title: revtv
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*
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* RevTV acts like a video waveform monitor for each line of video
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* processed. This creates a pseudo 3D effect based on the brightness
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* of the video along each line.
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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 ! revtv ! videoconvert ! autovideosink
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* ]| This pipeline shows the effect of revtv 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 <string.h>
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#include "gsteffectv.h"
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#include "gstrev.h"
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#define THE_COLOR 0xffffffff
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enum
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{
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PROP_0,
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PROP_DELAY,
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PROP_LINESPACE,
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PROP_GAIN
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};
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#define gst_revtv_parent_class parent_class
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G_DEFINE_TYPE (GstRevTV, gst_revtv, GST_TYPE_VIDEO_FILTER);
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GST_ELEMENT_REGISTER_DEFINE (revtv, "revtv", GST_RANK_NONE,
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gst_revtv_get_type ());
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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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static GstStaticPadTemplate gst_revtv_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 GstStaticPadTemplate gst_revtv_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 GstFlowReturn
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gst_revtv_transform_frame (GstVideoFilter * vfilter, GstVideoFrame * in_frame,
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GstVideoFrame * out_frame)
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{
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GstRevTV *filter = GST_REVTV (vfilter);
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guint32 *src, *dest;
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gint width, height, sstride, dstride;
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guint32 *nsrc;
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gint y, x, R, G, B, yval;
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gint linespace, vscale;
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GstClockTime timestamp, stream_time;
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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 (vfilter)->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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src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
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sstride = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0);
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dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
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dstride = GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 0);
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width = GST_VIDEO_FRAME_WIDTH (in_frame);
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height = GST_VIDEO_FRAME_HEIGHT (in_frame);
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/* Clear everything to black */
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memset (dest, 0, dstride * height);
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GST_OBJECT_LOCK (filter);
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linespace = filter->linespace;
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vscale = filter->vscale;
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/* draw the offset lines */
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for (y = 0; y < height; y += linespace) {
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for (x = 0; x <= width; x++) {
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nsrc = src + (y * sstride / 4) + x;
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/* Calc Y Value for curpix */
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R = ((*nsrc) & 0xff0000) >> (16 - 1);
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G = ((*nsrc) & 0xff00) >> (8 - 2);
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B = (*nsrc) & 0xff;
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yval = y - ((short) (R + G + B) / vscale);
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if (yval > 0) {
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dest[x + (yval * dstride / 4)] = THE_COLOR;
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}
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}
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}
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GST_OBJECT_UNLOCK (filter);
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return GST_FLOW_OK;
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}
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static void
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gst_revtv_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstRevTV *filter = GST_REVTV (object);
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GST_OBJECT_LOCK (filter);
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switch (prop_id) {
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case PROP_DELAY:
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filter->vgrabtime = g_value_get_int (value);
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break;
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case PROP_LINESPACE:
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filter->linespace = g_value_get_int (value);
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break;
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case PROP_GAIN:
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filter->vscale = g_value_get_int (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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GST_OBJECT_UNLOCK (filter);
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}
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static void
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gst_revtv_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstRevTV *filter = GST_REVTV (object);
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switch (prop_id) {
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case PROP_DELAY:
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g_value_set_int (value, filter->vgrabtime);
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break;
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case PROP_LINESPACE:
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g_value_set_int (value, filter->linespace);
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break;
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case PROP_GAIN:
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g_value_set_int (value, filter->vscale);
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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_revtv_class_init (GstRevTVClass * 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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gobject_class->set_property = gst_revtv_set_property;
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gobject_class->get_property = gst_revtv_get_property;
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DELAY,
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g_param_spec_int ("delay", "Delay", "Delay in frames between updates",
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1, 100, 1,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_LINESPACE,
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g_param_spec_int ("linespace", "Linespace", "Control line spacing", 1,
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100, 6,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_GAIN,
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g_param_spec_int ("gain", "Gain", "Control gain", 1, 200, 50,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE));
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gst_element_class_set_static_metadata (gstelement_class, "RevTV effect",
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"Filter/Effect/Video",
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"A video waveform monitor for each line of video processed",
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"Wim Taymans <wim.taymans@gmail.be>");
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_revtv_sink_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_revtv_src_template);
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vfilter_class->transform_frame =
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GST_DEBUG_FUNCPTR (gst_revtv_transform_frame);
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}
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static void
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gst_revtv_init (GstRevTV * restv)
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{
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restv->vgrabtime = 1;
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restv->vgrab = 0;
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restv->linespace = 6;
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restv->vscale = 50;
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}
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