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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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331 lines
8.6 KiB
C
331 lines
8.6 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 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:element-vertigotv
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*
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* VertigoTV is a loopback alpha blending effector with rotating and scaling.
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch -v videotestsrc ! vertigotv ! ffmpegcolorspace ! autovideosink
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* ]| This pipeline shows the effect of vertigotv on a test stream.
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* </refsect2>
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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 "gstvertigo.h"
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#include <gst/video/video.h>
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#include <gst/controller/gstcontroller.h>
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GST_BOILERPLATE (GstVertigoTV, gst_vertigotv, GstVideoFilter,
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GST_TYPE_VIDEO_FILTER);
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/* Filter signals and args */
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enum
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{
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PROP_0,
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PROP_SPEED,
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PROP_ZOOM_SPEED
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};
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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#define CAPS_STR GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_BGRx
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#else
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#define CAPS_STR GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_xBGR
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#endif
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static GstStaticPadTemplate gst_vertigotv_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_vertigotv_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 gboolean
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gst_vertigotv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
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GstCaps * outcaps)
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{
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GstVertigoTV *filter = GST_VERTIGOTV (btrans);
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GstStructure *structure;
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gboolean ret = FALSE;
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structure = gst_caps_get_structure (incaps, 0);
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GST_OBJECT_LOCK (filter);
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if (gst_structure_get_int (structure, "width", &filter->width) &&
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gst_structure_get_int (structure, "height", &filter->height)) {
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gint area = filter->width * filter->height;
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g_free (filter->buffer);
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filter->buffer = (guint32 *) g_malloc0 (area * 2 * sizeof (guint32));
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filter->current_buffer = filter->buffer;
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filter->alt_buffer = filter->buffer + area;
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filter->phase = 0;
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ret = TRUE;
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}
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GST_OBJECT_UNLOCK (filter);
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return ret;
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}
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static void
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gst_vertigotv_set_parms (GstVertigoTV * filter)
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{
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double vx, vy;
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double t;
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double x, y;
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double dizz;
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dizz = sin (filter->phase) * 10 + sin (filter->phase * 1.9 + 5) * 5;
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x = filter->width / 2;
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y = filter->height / 2;
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t = (x * x + y * y) * filter->zoomrate;
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if (filter->width > filter->height) {
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if (dizz >= 0) {
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if (dizz > x)
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dizz = x;
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vx = (x * (x - dizz) + y * y) / t;
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} else {
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if (dizz < -x)
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dizz = -x;
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vx = (x * (x + dizz) + y * y) / t;
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}
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vy = (dizz * y) / t;
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} else {
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if (dizz >= 0) {
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if (dizz > y)
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dizz = y;
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vx = (x * x + y * (y - dizz)) / t;
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} else {
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if (dizz < -y)
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dizz = -y;
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vx = (x * x + y * (y + dizz)) / t;
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}
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vy = (dizz * x) / t;
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}
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filter->dx = vx * 65536;
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filter->dy = vy * 65536;
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filter->sx = (-vx * x + vy * y + x + cos (filter->phase * 5) * 2) * 65536;
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filter->sy = (-vx * y - vy * x + y + sin (filter->phase * 6) * 2) * 65536;
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filter->phase += filter->phase_increment;
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if (filter->phase > 5700000)
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filter->phase = 0;
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}
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static GstFlowReturn
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gst_vertigotv_transform (GstBaseTransform * trans, GstBuffer * in,
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GstBuffer * out)
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{
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GstVertigoTV *filter = GST_VERTIGOTV (trans);
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guint32 *src, *dest, *p;
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guint32 v;
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gint x, y, ox, oy, i, width, height, area;
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GstFlowReturn ret = GST_FLOW_OK;
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GstClockTime timestamp, stream_time;
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timestamp = GST_BUFFER_TIMESTAMP (in);
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stream_time =
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gst_segment_to_stream_time (&trans->segment, 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 (G_OBJECT (filter), stream_time);
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src = (guint32 *) GST_BUFFER_DATA (in);
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dest = (guint32 *) GST_BUFFER_DATA (out);
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GST_OBJECT_LOCK (filter);
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width = filter->width;
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height = filter->height;
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area = width * height;
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gst_vertigotv_set_parms (filter);
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p = filter->alt_buffer;
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for (y = height; y > 0; y--) {
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ox = filter->sx;
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oy = filter->sy;
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for (x = width; x > 0; x--) {
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i = (oy >> 16) * width + (ox >> 16);
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if (i < 0)
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i = 0;
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if (i >= area)
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i = area;
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v = filter->current_buffer[i] & 0xfcfcff;
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v = (v * 3) + ((*src++) & 0xfcfcff);
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*p++ = (v >> 2);
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ox += filter->dx;
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oy += filter->dy;
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}
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filter->sx -= filter->dy;
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filter->sy += filter->dx;
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}
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memcpy (dest, filter->alt_buffer, area * sizeof (guint32));
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p = filter->current_buffer;
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filter->current_buffer = filter->alt_buffer;
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filter->alt_buffer = p;
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GST_OBJECT_UNLOCK (filter);
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return ret;
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}
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static gboolean
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gst_vertigotv_start (GstBaseTransform * trans)
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{
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GstVertigoTV *filter = GST_VERTIGOTV (trans);
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filter->phase = 0.0;
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return TRUE;
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}
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static void
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gst_vertigotv_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstVertigoTV *filter = GST_VERTIGOTV (object);
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GST_OBJECT_LOCK (filter);
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switch (prop_id) {
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case PROP_SPEED:
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filter->phase_increment = g_value_get_float (value);
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break;
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case PROP_ZOOM_SPEED:
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filter->zoomrate = g_value_get_float (value);
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break;
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default:
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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_vertigotv_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstVertigoTV *filter = GST_VERTIGOTV (object);
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switch (prop_id) {
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case PROP_SPEED:
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g_value_set_float (value, filter->phase_increment);
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break;
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case PROP_ZOOM_SPEED:
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g_value_set_float (value, filter->zoomrate);
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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_vertigotv_finalize (GObject * object)
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{
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GstVertigoTV *filter = GST_VERTIGOTV (object);
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g_free (filter->buffer);
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filter->buffer = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_vertigotv_base_init (gpointer g_class)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
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gst_element_class_set_details_simple (element_class, "VertigoTV effect",
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"Filter/Effect/Video",
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"A loopback alpha blending effector with rotating and scaling",
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"Wim Taymans <wim.taymans@chello.be>");
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_vertigotv_sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_vertigotv_src_template));
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}
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static void
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gst_vertigotv_class_init (GstVertigoTVClass * klass)
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{
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GObjectClass *gobject_class = (GObjectClass *) klass;
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GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
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gobject_class->set_property = gst_vertigotv_set_property;
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gobject_class->get_property = gst_vertigotv_get_property;
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gobject_class->finalize = gst_vertigotv_finalize;
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SPEED,
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g_param_spec_float ("speed", "Speed", "Control the speed of movement",
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0.01, 100.0, 0.02, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ZOOM_SPEED,
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g_param_spec_float ("zoom-speed", "Zoom Speed",
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"Control the rate of zooming", 1.01, 1.1, 1.01,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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trans_class->start = GST_DEBUG_FUNCPTR (gst_vertigotv_start);
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trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_vertigotv_set_caps);
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trans_class->transform = GST_DEBUG_FUNCPTR (gst_vertigotv_transform);
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}
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static void
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gst_vertigotv_init (GstVertigoTV * filter, GstVertigoTVClass * klass)
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{
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filter->buffer = NULL;
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filter->phase = 0.0;
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filter->phase_increment = 0.02;
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filter->zoomrate = 1.01;
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gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SRC_PAD (filter));
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gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SINK_PAD (filter));
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}
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