gstreamer/gst/effectv/gststreak.c

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/* GStreamer
* Copyright (C) <2009> Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* EffecTV - Realtime Digital Video Effector
* Copyright (C) 2001-2006 FUKUCHI Kentaro
*
* StreakTV - afterimage effector.
* Copyright (C) 2001-2002 FUKUCHI Kentaro
*
* This combines the StreakTV and BaltanTV effects, which are
* very similar. BaltanTV is used if the feedback property is set
* to TRUE, otherwise StreakTV is used.
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION:element-streaktv
*
* StreakTV makes after images of moving objects.
*
* <refsect2>
* <title>Example launch line</title>
* |[
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* gst-launch -v videotestsrc ! streaktv ! videoconvert ! autovideosink
* ]| This pipeline shows the effect of streaktv on a test stream.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <math.h>
#include <string.h>
#include "gststreak.h"
#include "gsteffectv.h"
#define DEFAULT_FEEDBACK FALSE
enum
{
PROP_0,
PROP_FEEDBACK
};
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#define gst_streaktv_parent_class parent_class
G_DEFINE_TYPE (GstStreakTV, gst_streaktv, GST_TYPE_VIDEO_FILTER);
static GstStaticPadTemplate gst_streaktv_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx, xBGR, xRGB }"))
);
static GstStaticPadTemplate gst_streaktv_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
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GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ BGRx, RGBx, xBGR, xRGB }"))
);
static GstFlowReturn
gst_streaktv_transform (GstBaseTransform * trans, GstBuffer * in,
GstBuffer * out)
{
GstStreakTV *filter = GST_STREAKTV (trans);
guint32 *src, *dest;
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GstVideoFrame in_frame, out_frame;
gint i, cf;
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gint video_area, width, height;
guint32 **planetable = filter->planetable;
gint plane = filter->plane;
guint stride_mask, stride_shift, stride;
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if (!gst_video_frame_map (&in_frame, &filter->info, in, GST_MAP_READ))
goto invalid_in;
if (!gst_video_frame_map (&out_frame, &filter->info, out, GST_MAP_WRITE))
goto invalid_out;
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);
video_area = width * height;
GST_OBJECT_LOCK (filter);
if (filter->feedback) {
stride_mask = 0xfcfcfcfc;
stride = 8;
stride_shift = 2;
} else {
stride_mask = 0xf8f8f8f8;
stride = 4;
stride_shift = 3;
}
for (i = 0; i < video_area; i++) {
planetable[plane][i] = (src[i] & stride_mask) >> stride_shift;
}
cf = plane & (stride - 1);
if (filter->feedback) {
for (i = 0; i < video_area; i++) {
dest[i] = planetable[cf][i]
+ planetable[cf + stride][i]
+ planetable[cf + stride * 2][i]
+ planetable[cf + stride * 3][i];
planetable[plane][i] = (dest[i] & stride_mask) >> stride_shift;
}
} else {
for (i = 0; i < video_area; i++) {
dest[i] = planetable[cf][i]
+ planetable[cf + stride][i]
+ planetable[cf + stride * 2][i]
+ planetable[cf + stride * 3][i]
+ planetable[cf + stride * 4][i]
+ planetable[cf + stride * 5][i]
+ planetable[cf + stride * 6][i]
+ planetable[cf + stride * 7][i];
}
}
plane++;
filter->plane = plane & (PLANES - 1);
GST_OBJECT_UNLOCK (filter);
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gst_video_frame_unmap (&in_frame);
gst_video_frame_unmap (&out_frame);
return GST_FLOW_OK;
/* ERRORS */
invalid_in:
{
GST_DEBUG_OBJECT (filter, "invalid input frame");
return GST_FLOW_ERROR;
}
invalid_out:
{
GST_DEBUG_OBJECT (filter, "invalid output frame");
gst_video_frame_unmap (&in_frame);
return GST_FLOW_ERROR;
}
}
static gboolean
gst_streaktv_set_caps (GstBaseTransform * btrans, GstCaps * incaps,
GstCaps * outcaps)
{
GstStreakTV *filter = GST_STREAKTV (btrans);
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GstVideoInfo info;
gint i, width, height;
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if (!gst_video_info_from_caps (&info, incaps))
goto invalid_caps;
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filter->info = info;
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width = GST_VIDEO_INFO_WIDTH (&info);
height = GST_VIDEO_INFO_HEIGHT (&info);
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if (filter->planebuffer)
g_free (filter->planebuffer);
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filter->planebuffer = g_new0 (guint32, width * height * 4 * PLANES);
for (i = 0; i < PLANES; i++)
filter->planetable[i] = &filter->planebuffer[width * height * i];
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return TRUE;
/* ERRORS */
invalid_caps:
{
GST_DEBUG_OBJECT (filter, "invalid caps received");
return FALSE;
}
}
static gboolean
gst_streaktv_start (GstBaseTransform * trans)
{
GstStreakTV *filter = GST_STREAKTV (trans);
filter->plane = 0;
return TRUE;
}
static void
gst_streaktv_finalize (GObject * object)
{
GstStreakTV *filter = GST_STREAKTV (object);
if (filter->planebuffer) {
g_free (filter->planebuffer);
filter->planebuffer = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_streaktv_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstStreakTV *filter = GST_STREAKTV (object);
switch (prop_id) {
case PROP_FEEDBACK:
if (G_UNLIKELY (GST_STATE (filter) >= GST_STATE_PAUSED)) {
g_warning ("Changing the \"feedback\" property only allowed "
"in state < PLAYING");
return;
}
filter->feedback = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_streaktv_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstStreakTV *filter = GST_STREAKTV (object);
switch (prop_id) {
case PROP_FEEDBACK:
g_value_set_boolean (value, filter->feedback);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_streaktv_class_init (GstStreakTVClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
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GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_streaktv_set_property;
gobject_class->get_property = gst_streaktv_get_property;
gobject_class->finalize = gst_streaktv_finalize;
g_object_class_install_property (gobject_class, PROP_FEEDBACK,
g_param_spec_boolean ("feedback", "Feedback",
"Feedback", DEFAULT_FEEDBACK,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_set_details_simple (gstelement_class, "StreakTV effect",
"Filter/Effect/Video",
"StreakTV makes after images of moving objects",
"FUKUCHI, Kentarou <fukuchi@users.sourceforge.net>, "
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_streaktv_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_streaktv_src_template));
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_streaktv_set_caps);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_streaktv_transform);
trans_class->start = GST_DEBUG_FUNCPTR (gst_streaktv_start);
}
static void
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gst_streaktv_init (GstStreakTV * filter)
{
filter->feedback = DEFAULT_FEEDBACK;
gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SRC_PAD (filter));
gst_pad_use_fixed_caps (GST_BASE_TRANSFORM_SINK_PAD (filter));
}