gstreamer/gst/effectv/gstvertigo.c
2021-03-29 12:45:22 +02:00

330 lines
8.6 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* EffecTV:
* Copyright (C) 2001 FUKUCHI Kentarou
*
* EffecTV is free software. 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-vertigotv
* @title: vertigotv
*
* VertigoTV is a loopback alpha blending effector with rotating and scaling.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v videotestsrc ! vertigotv ! videoconvert ! autovideosink
* ]| This pipeline shows the effect of vertigotv on a test stream.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include "gsteffectv.h"
#include "gstvertigo.h"
#define gst_vertigotv_parent_class parent_class
G_DEFINE_TYPE (GstVertigoTV, gst_vertigotv, GST_TYPE_VIDEO_FILTER);
GST_ELEMENT_REGISTER_DEFINE (vertigotv, "vertigotv", GST_RANK_NONE,
GST_TYPE_VERTIGOTV);
/* Filter signals and args */
enum
{
PROP_0,
PROP_SPEED,
PROP_ZOOM_SPEED
};
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ RGBx, BGRx }")
#else
#define CAPS_STR GST_VIDEO_CAPS_MAKE ("{ xRGB, xBGR }")
#endif
static GstStaticPadTemplate gst_vertigotv_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static GstStaticPadTemplate gst_vertigotv_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (CAPS_STR)
);
static gboolean
gst_vertigotv_set_info (GstVideoFilter * vfilter, GstCaps * incaps,
GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
{
GstVertigoTV *filter = GST_VERTIGOTV (vfilter);
gint area, width, height;
width = GST_VIDEO_INFO_WIDTH (in_info);
height = GST_VIDEO_INFO_HEIGHT (in_info);
area = width * height;
g_free (filter->buffer);
filter->buffer = (guint32 *) g_malloc0 (area * 2 * sizeof (guint32));
filter->current_buffer = filter->buffer;
filter->alt_buffer = filter->buffer + area;
filter->phase = 0;
return TRUE;
}
static void
gst_vertigotv_set_parms (GstVertigoTV * filter)
{
double vx, vy;
double t;
double x, y;
double dizz;
gint width, height;
GstVideoInfo *info;
dizz = sin (filter->phase) * 10 + sin (filter->phase * 1.9 + 5) * 5;
info = &GST_VIDEO_FILTER (filter)->in_info;
width = GST_VIDEO_INFO_WIDTH (info);
height = GST_VIDEO_INFO_HEIGHT (info);
x = width / 2;
y = height / 2;
t = (x * x + y * y) * filter->zoomrate;
if (width > height) {
if (dizz >= 0) {
if (dizz > x)
dizz = x;
vx = (x * (x - dizz) + y * y) / t;
} else {
if (dizz < -x)
dizz = -x;
vx = (x * (x + dizz) + y * y) / t;
}
vy = (dizz * y) / t;
} else {
if (dizz >= 0) {
if (dizz > y)
dizz = y;
vx = (x * x + y * (y - dizz)) / t;
} else {
if (dizz < -y)
dizz = -y;
vx = (x * x + y * (y + dizz)) / t;
}
vy = (dizz * x) / t;
}
filter->dx = vx * 65536;
filter->dy = vy * 65536;
filter->sx = (-vx * x + vy * y + x + cos (filter->phase * 5) * 2) * 65536;
filter->sy = (-vx * y - vy * x + y + sin (filter->phase * 6) * 2) * 65536;
filter->phase += filter->phase_increment;
if (filter->phase > 5700000)
filter->phase = 0;
}
static GstFlowReturn
gst_vertigotv_transform_frame (GstVideoFilter * vfilter,
GstVideoFrame * in_frame, GstVideoFrame * out_frame)
{
GstVertigoTV *filter = GST_VERTIGOTV (vfilter);
guint32 *src, *dest, *p;
guint32 v;
gint x, y, ox, oy, i, width, height, area, sstride, dstride;
GstClockTime timestamp, stream_time;
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);
src = GST_VIDEO_FRAME_PLANE_DATA (in_frame, 0);
sstride = GST_VIDEO_FRAME_PLANE_STRIDE (in_frame, 0);
dest = GST_VIDEO_FRAME_PLANE_DATA (out_frame, 0);
dstride = GST_VIDEO_FRAME_PLANE_STRIDE (out_frame, 0);
width = GST_VIDEO_FRAME_WIDTH (in_frame);
height = GST_VIDEO_FRAME_HEIGHT (in_frame);
area = width * height;
sstride /= 4;
dstride /= 4;
gst_vertigotv_set_parms (filter);
p = filter->alt_buffer;
for (y = 0; y < height; y++) {
ox = filter->sx;
oy = filter->sy;
for (x = 0; x < width; x++) {
i = (oy >> 16) * width + (ox >> 16);
if (i < 0)
i = 0;
if (i >= area)
i = area;
v = filter->current_buffer[i] & 0xfcfcff;
v = (v * 3) + (src[x] & 0xfcfcff);
*p++ = dest[x] = (v >> 2);
ox += filter->dx;
oy += filter->dy;
}
filter->sx -= filter->dy;
filter->sy += filter->dx;
src += sstride;
dest += dstride;
}
p = filter->current_buffer;
filter->current_buffer = filter->alt_buffer;
filter->alt_buffer = p;
return GST_FLOW_OK;
}
static gboolean
gst_vertigotv_start (GstBaseTransform * trans)
{
GstVertigoTV *filter = GST_VERTIGOTV (trans);
filter->phase = 0.0;
return TRUE;
}
static void
gst_vertigotv_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVertigoTV *filter = GST_VERTIGOTV (object);
GST_OBJECT_LOCK (filter);
switch (prop_id) {
case PROP_SPEED:
filter->phase_increment = g_value_get_float (value);
break;
case PROP_ZOOM_SPEED:
filter->zoomrate = g_value_get_float (value);
break;
default:
break;
}
GST_OBJECT_UNLOCK (filter);
}
static void
gst_vertigotv_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVertigoTV *filter = GST_VERTIGOTV (object);
switch (prop_id) {
case PROP_SPEED:
g_value_set_float (value, filter->phase_increment);
break;
case PROP_ZOOM_SPEED:
g_value_set_float (value, filter->zoomrate);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_vertigotv_finalize (GObject * object)
{
GstVertigoTV *filter = GST_VERTIGOTV (object);
g_free (filter->buffer);
filter->buffer = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_vertigotv_class_init (GstVertigoTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
gobject_class->set_property = gst_vertigotv_set_property;
gobject_class->get_property = gst_vertigotv_get_property;
gobject_class->finalize = gst_vertigotv_finalize;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SPEED,
g_param_spec_float ("speed", "Speed", "Control the speed of movement",
0.01, 100.0, 0.02, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ZOOM_SPEED,
g_param_spec_float ("zoom-speed", "Zoom Speed",
"Control the rate of zooming", 1.01, 1.1, 1.01,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gst_element_class_set_static_metadata (gstelement_class, "VertigoTV effect",
"Filter/Effect/Video",
"A loopback alpha blending effector with rotating and scaling",
"Wim Taymans <wim.taymans@gmail.be>");
gst_element_class_add_static_pad_template (gstelement_class,
&gst_vertigotv_sink_template);
gst_element_class_add_static_pad_template (gstelement_class,
&gst_vertigotv_src_template);
trans_class->start = GST_DEBUG_FUNCPTR (gst_vertigotv_start);
vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_vertigotv_set_info);
vfilter_class->transform_frame =
GST_DEBUG_FUNCPTR (gst_vertigotv_transform_frame);
}
static void
gst_vertigotv_init (GstVertigoTV * filter)
{
filter->buffer = NULL;
filter->phase = 0.0;
filter->phase_increment = 0.02;
filter->zoomrate = 1.01;
}