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gstreamer/gst/videoscale/gstvideoscale.c
Sebastian Dröge 6fb91f7711 videoscale: Rename borders property to add-borders
2010-07-19 15:59:17 +02:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2005 David Schleef <ds@schleef.org>
*
* 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-videoscale
* @see_also: videorate, ffmpegcolorspace
*
* This element resizes video frames. By default the element will try to
* negotiate to the same size on the source and sinkpad so that no scaling
* is needed. It is therefore safe to insert this element in a pipeline to
* get more robust behaviour without any cost if no scaling is needed.
*
* This element supports a wide range of color spaces including various YUV and
* RGB formats and is therefore generally able to operate anywhere in a
* pipeline.
*
* <refsect2>
* <title>Example pipelines</title>
* |[
* gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! ffmpegcolorspace ! videoscale ! ximagesink
* ]| Decode an Ogg/Theora and display the video using ximagesink. Since
* ximagesink cannot perform scaling, the video scaling will be performed by
* videoscale when you resize the video window.
* To create the test Ogg/Theora file refer to the documentation of theoraenc.
* |[
* gst-launch -v filesrc location=videotestsrc.ogg ! oggdemux ! theoradec ! videoscale ! video/x-raw-yuv, width=50 ! xvimagesink
* ]| Decode an Ogg/Theora and display the video using xvimagesink with a width
* of 50.
* </refsect2>
*
* Last reviewed on 2006-03-02 (0.10.4)
*/
/*
* Formulas for PAR, DAR, width and height relations:
*
* dar_n w par_n
* ----- = - * -----
* dar_d h par_d
*
* par_n h dar_n
* ----- = - * -----
* par_d w dar_d
*
* dar_n par_d
* w = h * ----- * -----
* dar_d par_n
*
* dar_d par_n
* h = w * ----- * -----
* dar_n par_d
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <math.h>
#include <gst/video/video.h>
#include "gstvideoscale.h"
#include "vs_image.h"
#include "vs_4tap.h"
#include "vs_fill_borders.h"
/* debug variable definition */
GST_DEBUG_CATEGORY (video_scale_debug);
#define DEFAULT_PROP_METHOD GST_VIDEO_SCALE_BILINEAR
#define DEFAULT_PROP_ADD_BORDERS FALSE
enum
{
PROP_0,
PROP_METHOD,
PROP_ADD_BORDERS
/* FILL ME */
};
#undef GST_VIDEO_SIZE_RANGE
#define GST_VIDEO_SIZE_RANGE "(int) [ 1, 32767]"
static GstStaticCaps gst_video_scale_format_caps[] = {
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBA),
GST_STATIC_CAPS (GST_VIDEO_CAPS_ARGB),
GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRA),
GST_STATIC_CAPS (GST_VIDEO_CAPS_ABGR),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGBx),
GST_STATIC_CAPS (GST_VIDEO_CAPS_xRGB),
GST_STATIC_CAPS (GST_VIDEO_CAPS_BGRx),
GST_STATIC_CAPS (GST_VIDEO_CAPS_xBGR),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("Y444")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("v308")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB),
GST_STATIC_CAPS (GST_VIDEO_CAPS_BGR),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("Y42B")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("YUY2")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("YVYU")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("UYVY")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("I420")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("YV12")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("Y41B")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB_16),
GST_STATIC_CAPS (GST_VIDEO_CAPS_RGB_15),
GST_STATIC_CAPS (GST_VIDEO_CAPS_GRAY16 ("BYTE_ORDER")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("Y16 ")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_GRAY8),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("Y800")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("Y8 ")),
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("GREY"))
};
#define GST_TYPE_VIDEO_SCALE_METHOD (gst_video_scale_method_get_type())
static GType
gst_video_scale_method_get_type (void)
{
static GType video_scale_method_type = 0;
static const GEnumValue video_scale_methods[] = {
{GST_VIDEO_SCALE_NEAREST, "Nearest Neighbour", "nearest-neighbour"},
{GST_VIDEO_SCALE_BILINEAR, "Bilinear", "bilinear"},
{GST_VIDEO_SCALE_4TAP, "4-tap", "4-tap"},
{0, NULL, NULL},
};
if (!video_scale_method_type) {
video_scale_method_type =
g_enum_register_static ("GstVideoScaleMethod", video_scale_methods);
}
return video_scale_method_type;
}
static GstCaps *
gst_video_scale_get_capslist (void)
{
static GstCaps *caps = NULL;
static volatile gsize inited = 0;
if (g_once_init_enter (&inited)) {
gint i;
g_assert (caps == NULL);
caps = gst_caps_new_empty ();
for (i = 0; i < G_N_ELEMENTS (gst_video_scale_format_caps); i++)
gst_caps_append (caps,
gst_caps_make_writable
(gst_static_caps_get (&gst_video_scale_format_caps[i])));
g_once_init_leave (&inited, 1);
}
return caps;
}
static GstPadTemplate *
gst_video_scale_src_template_factory (void)
{
return gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
gst_caps_ref (gst_video_scale_get_capslist ()));
}
static GstPadTemplate *
gst_video_scale_sink_template_factory (void)
{
return gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
gst_caps_ref (gst_video_scale_get_capslist ()));
}
static void gst_video_scale_finalize (GstVideoScale * videoscale);
static gboolean gst_video_scale_src_event (GstBaseTransform * trans,
GstEvent * event);
/* base transform vmethods */
static GstCaps *gst_video_scale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps);
static gboolean gst_video_scale_set_caps (GstBaseTransform * trans,
GstCaps * in, GstCaps * out);
static gboolean gst_video_scale_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, guint * size);
static GstFlowReturn gst_video_scale_transform (GstBaseTransform * trans,
GstBuffer * in, GstBuffer * out);
static void gst_video_scale_fixate_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static void gst_video_scale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_video_scale_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
GST_BOILERPLATE (GstVideoScale, gst_video_scale, GstVideoFilter,
GST_TYPE_VIDEO_FILTER);
static void
gst_video_scale_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class,
"Video scaler", "Filter/Effect/Video",
"Resizes video", "Wim Taymans <wim.taymans@chello.be>");
gst_element_class_add_pad_template (element_class,
gst_video_scale_sink_template_factory ());
gst_element_class_add_pad_template (element_class,
gst_video_scale_src_template_factory ());
}
static void
gst_video_scale_class_init (GstVideoScaleClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass;
gobject_class->finalize = (GObjectFinalizeFunc) gst_video_scale_finalize;
gobject_class->set_property = gst_video_scale_set_property;
gobject_class->get_property = gst_video_scale_get_property;
g_object_class_install_property (gobject_class, PROP_METHOD,
g_param_spec_enum ("method", "method", "method",
GST_TYPE_VIDEO_SCALE_METHOD, DEFAULT_PROP_METHOD,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ADD_BORDERS,
g_param_spec_boolean ("add-borders", "Add Borders",
"Add black borders if necessary to keep the display aspect ratio",
DEFAULT_PROP_ADD_BORDERS,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_video_scale_transform_caps);
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_video_scale_set_caps);
trans_class->get_unit_size =
GST_DEBUG_FUNCPTR (gst_video_scale_get_unit_size);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_video_scale_transform);
trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_video_scale_fixate_caps);
trans_class->src_event = GST_DEBUG_FUNCPTR (gst_video_scale_src_event);
}
static void
gst_video_scale_init (GstVideoScale * videoscale, GstVideoScaleClass * klass)
{
videoscale->tmp_buf = NULL;
videoscale->method = DEFAULT_PROP_METHOD;
videoscale->add_borders = DEFAULT_PROP_ADD_BORDERS;
}
static void
gst_video_scale_finalize (GstVideoScale * videoscale)
{
if (videoscale->tmp_buf)
g_free (videoscale->tmp_buf);
G_OBJECT_CLASS (parent_class)->finalize (G_OBJECT (videoscale));
}
static void
gst_video_scale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstVideoScale *vscale = GST_VIDEO_SCALE (object);
switch (prop_id) {
case PROP_METHOD:
GST_OBJECT_LOCK (vscale);
vscale->method = g_value_get_enum (value);
GST_OBJECT_UNLOCK (vscale);
break;
case PROP_ADD_BORDERS:
GST_OBJECT_LOCK (vscale);
vscale->add_borders = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (vscale);
gst_base_transform_reconfigure (GST_BASE_TRANSFORM_CAST (vscale));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_video_scale_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVideoScale *vscale = GST_VIDEO_SCALE (object);
switch (prop_id) {
case PROP_METHOD:
GST_OBJECT_LOCK (vscale);
g_value_set_enum (value, vscale->method);
GST_OBJECT_UNLOCK (vscale);
break;
case PROP_ADD_BORDERS:
GST_OBJECT_LOCK (vscale);
g_value_set_boolean (value, vscale->add_borders);
GST_OBJECT_UNLOCK (vscale);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstCaps *
gst_video_scale_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps)
{
GstCaps *ret;
GstStructure *structure;
/* this function is always called with a simple caps */
g_return_val_if_fail (GST_CAPS_IS_SIMPLE (caps), NULL);
ret = gst_caps_copy (caps);
structure = gst_structure_copy (gst_caps_get_structure (ret, 0));
gst_structure_set (structure,
"width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
"height", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
/* if pixel aspect ratio, make a range of it */
if (gst_structure_has_field (structure, "pixel-aspect-ratio")) {
gst_structure_set (structure,
"pixel-aspect-ratio", GST_TYPE_FRACTION_RANGE, 1, G_MAXINT, G_MAXINT, 1,
NULL);
}
gst_caps_merge_structure (ret, gst_structure_copy (structure));
gst_structure_free (structure);
GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, ret);
return ret;
}
static gboolean
gst_video_scale_set_caps (GstBaseTransform * trans, GstCaps * in, GstCaps * out)
{
GstVideoScale *videoscale = GST_VIDEO_SCALE (trans);
gboolean ret;
gint from_dar_n, from_dar_d, to_dar_n, to_dar_d;
gint from_par_n, from_par_d, to_par_n, to_par_d;
ret =
gst_video_format_parse_caps (in, &videoscale->format,
&videoscale->from_width, &videoscale->from_height);
ret &=
gst_video_format_parse_caps (out, NULL, &videoscale->to_width,
&videoscale->to_height);
if (!ret)
goto done;
videoscale->src_size = gst_video_format_get_size (videoscale->format,
videoscale->from_width, videoscale->from_height);
videoscale->dest_size = gst_video_format_get_size (videoscale->format,
videoscale->to_width, videoscale->to_height);
if (!gst_video_parse_caps_pixel_aspect_ratio (in, &from_par_n, &from_par_d))
from_par_n = from_par_d = 1;
if (!gst_video_parse_caps_pixel_aspect_ratio (out, &to_par_n, &to_par_d))
to_par_n = to_par_d = 1;
if (!gst_util_fraction_multiply (videoscale->from_width,
videoscale->from_height, from_par_n, from_par_d, &from_dar_n,
&from_dar_d)) {
from_dar_n = from_dar_d = -1;
}
if (!gst_util_fraction_multiply (videoscale->to_width,
videoscale->to_height, to_par_n, to_par_d, &to_dar_n, &to_dar_d)) {
to_dar_n = to_dar_d = -1;
}
videoscale->borders_w = videoscale->borders_h = 0;
if (to_dar_n != from_dar_n || to_dar_d != from_dar_d) {
if (videoscale->add_borders) {
gint n, d, to_h, to_w;
if (from_dar_n != -1 && from_dar_d != -1
&& gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_n,
to_par_d, &n, &d)) {
to_h = gst_util_uint64_scale_int (videoscale->to_width, d, n);
if (to_h <= videoscale->to_height) {
videoscale->borders_h = videoscale->to_height - to_h;
videoscale->borders_w = 0;
} else {
to_w = gst_util_uint64_scale_int (videoscale->to_height, n, d);
g_assert (to_w <= videoscale->to_width);
videoscale->borders_h = 0;
videoscale->borders_w = videoscale->to_width - to_w;
}
} else {
GST_WARNING_OBJECT (videoscale, "Can't calculate borders");
}
} else {
GST_WARNING_OBJECT (videoscale, "Can't keep DAR!");
}
}
if (videoscale->tmp_buf)
g_free (videoscale->tmp_buf);
videoscale->tmp_buf =
g_malloc (gst_video_format_get_row_stride (videoscale->format, 0,
videoscale->to_width) * 4);
gst_base_transform_set_passthrough (trans,
(videoscale->from_width == videoscale->to_width
&& videoscale->from_height == videoscale->to_height));
GST_DEBUG_OBJECT (videoscale, "from=%dx%d (par=%d/%d dar=%d/%d), size %d "
"-> to=%dx%d (par=%d/%d dar=%d/%d borders=%d:%d), size %d",
videoscale->from_width, videoscale->from_height, from_par_n, from_par_d,
from_dar_n, from_dar_d, videoscale->src_size, videoscale->to_width,
videoscale->to_height, to_par_n, to_par_d, to_dar_n, to_dar_d,
videoscale->borders_w, videoscale->borders_h, videoscale->dest_size);
done:
return ret;
}
static gboolean
gst_video_scale_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
guint * size)
{
GstVideoFormat format;
gint width, height;
if (!gst_video_format_parse_caps (caps, &format, &width, &height))
return FALSE;
*size = gst_video_format_get_size (format, width, height);
return TRUE;
}
static void
gst_video_scale_fixate_caps (GstBaseTransform * base, GstPadDirection direction,
GstCaps * caps, GstCaps * othercaps)
{
GstStructure *ins, *outs;
const GValue *from_par, *to_par;
GValue fpar = { 0, }, tpar = {
0,};
g_return_if_fail (gst_caps_is_fixed (caps));
GST_DEBUG_OBJECT (base, "trying to fixate othercaps %" GST_PTR_FORMAT
" based on caps %" GST_PTR_FORMAT, othercaps, caps);
ins = gst_caps_get_structure (caps, 0);
outs = gst_caps_get_structure (othercaps, 0);
from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");
/* If we're fixating from the sinkpad we always set the PAR and
* assume that missing PAR on the sinkpad means 1/1 and
* missing PAR on the srcpad means undefined
*/
if (direction == GST_PAD_SINK) {
if (!from_par) {
g_value_init (&fpar, GST_TYPE_FRACTION);
gst_value_set_fraction (&fpar, 1, 1);
from_par = &fpar;
}
if (!to_par) {
g_value_init (&tpar, GST_TYPE_FRACTION_RANGE);
gst_value_set_fraction_range_full (&tpar, 1, G_MAXINT, G_MAXINT, 1);
to_par = &tpar;
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION_RANGE, 1,
G_MAXINT, G_MAXINT, 1, NULL);
}
} else {
if (!to_par) {
g_value_init (&tpar, GST_TYPE_FRACTION);
gst_value_set_fraction (&tpar, 1, 1);
to_par = &tpar;
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
NULL);
}
if (!from_par) {
g_value_init (&fpar, GST_TYPE_FRACTION_RANGE);
gst_value_set_fraction_range_full (&fpar, 1, G_MAXINT, G_MAXINT, 1);
from_par = &fpar;
}
}
/* we have both PAR but they might not be fixated */
{
gint from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
gint w = 0, h = 0;
gint from_dar_n, from_dar_d;
gint num, den;
/* from_par should be fixed */
g_return_if_fail (gst_value_is_fixed (from_par));
from_par_n = gst_value_get_fraction_numerator (from_par);
from_par_d = gst_value_get_fraction_denominator (from_par);
gst_structure_get_int (ins, "width", &from_w);
gst_structure_get_int (ins, "height", &from_h);
gst_structure_get_int (outs, "width", &w);
gst_structure_get_int (outs, "height", &h);
/* if both width and height are already fixed, we can't do anything
* about it anymore */
if (w && h) {
guint n, d;
GST_DEBUG_OBJECT (base, "dimensions already set to %dx%d, not fixating",
w, h);
if (!gst_value_is_fixed (to_par)) {
if (gst_video_calculate_display_ratio (&n, &d, from_w, from_h,
from_par_n, from_par_d, w, h)) {
GST_DEBUG_OBJECT (base, "fixating to_par to %dx%d", n, d);
if (gst_structure_has_field (outs, "pixel-aspect-ratio"))
gst_structure_fixate_field_nearest_fraction (outs,
"pixel-aspect-ratio", n, d);
else
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
n, d, NULL);
}
}
goto done;
}
/* Calculate input DAR */
if (!gst_util_fraction_multiply (from_w, from_h, from_par_n, from_par_d,
&from_dar_n, &from_dar_d)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
GST_DEBUG_OBJECT (base, "Input DAR is %d/%d", from_dar_n, from_dar_d);
/* If either width or height are fixed there's not much we
* can do either except choosing a height or width and PAR
* that matches the DAR as good as possible
*/
if (h) {
GstStructure *tmp;
gint set_w, set_par_n, set_par_d;
GST_DEBUG_OBJECT (base, "height is fixed (%d)", h);
/* If the PAR is fixed too, there's not much to do
* except choosing the width that is nearest to the
* width with the same DAR */
if (gst_value_is_fixed (to_par)) {
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
GST_DEBUG_OBJECT (base, "PAR is fixed %d/%d", to_par_n, to_par_d);
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
to_par_n, &num, &den)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
w = (guint) gst_util_uint64_scale_int (h, num, den);
gst_structure_fixate_field_nearest_int (outs, "width", w);
goto done;
}
/* The PAR is not fixed and it's quite likely that we can set
* an arbitrary PAR. */
/* Check if we can keep the input width */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
gst_structure_get_int (tmp, "width", &set_w);
/* Might have failed but try to keep the DAR nonetheless by
* adjusting the PAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, h, set_w,
&to_par_n, &to_par_d)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
gst_structure_free (tmp);
goto done;
}
gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
to_par_n, to_par_d);
gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
&set_par_d);
gst_structure_free (tmp);
/* Check if the adjusted PAR is accepted */
if (set_par_n == to_par_n && set_par_d == to_par_d) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w,
"pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d,
NULL);
goto done;
}
/* Otherwise scale the width to the new PAR and check if the
* adjusted with is accepted. If all that fails we can't keep
* the DAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
set_par_n, &num, &den)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
w = (guint) gst_util_uint64_scale_int (h, num, den);
gst_structure_fixate_field_nearest_int (outs, "width", w);
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
} else if (w) {
GstStructure *tmp;
gint set_h, set_par_n, set_par_d;
GST_DEBUG_OBJECT (base, "width is fixed (%d)", w);
/* If the PAR is fixed too, there's not much to do
* except choosing the height that is nearest to the
* height with the same DAR */
if (gst_value_is_fixed (to_par)) {
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
GST_DEBUG_OBJECT (base, "PAR is fixed %d/%d", to_par_n, to_par_d);
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
to_par_n, &num, &den)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
h = (guint) gst_util_uint64_scale_int (w, den, num);
gst_structure_fixate_field_nearest_int (outs, "height", h);
goto done;
}
/* The PAR is not fixed and it's quite likely that we can set
* an arbitrary PAR. */
/* Check if we can keep the input height */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
gst_structure_get_int (tmp, "height", &set_h);
/* Might have failed but try to keep the DAR nonetheless by
* adjusting the PAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, w,
&to_par_n, &to_par_d)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
gst_structure_free (tmp);
goto done;
}
gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
to_par_n, to_par_d);
gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
&set_par_d);
gst_structure_free (tmp);
/* Check if the adjusted PAR is accepted */
if (set_par_n == to_par_n && set_par_d == to_par_d) {
gst_structure_set (outs, "height", G_TYPE_INT, set_h,
"pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d,
NULL);
goto done;
}
/* Otherwise scale the height to the new PAR and check if the
* adjusted with is accepted. If all that fails we can't keep
* the DAR */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
set_par_n, &num, &den)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
h = (guint) gst_util_uint64_scale_int (w, den, num);
gst_structure_fixate_field_nearest_int (outs, "height", h);
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
} else if (gst_value_is_fixed (to_par)) {
GstStructure *tmp;
gint set_h, set_w, f_h, f_w;
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
/* Calculate scale factor for the PAR change */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_n,
to_par_d, &num, &den)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
/* Try to keep the input height (because of interlacing) */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
gst_structure_get_int (tmp, "height", &set_h);
/* This might have failed but try to scale the width
* to keep the DAR nonetheless */
w = (guint) gst_util_uint64_scale_int (set_h, num, den);
gst_structure_fixate_field_nearest_int (tmp, "width", w);
gst_structure_get_int (tmp, "width", &set_w);
gst_structure_free (tmp);
/* We kept the DAR and the height is nearest to the original height */
if (set_w == w) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, NULL);
goto done;
}
f_h = set_h;
f_w = set_w;
/* If the former failed, try to keep the input width at least */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
gst_structure_get_int (tmp, "width", &set_w);
/* This might have failed but try to scale the width
* to keep the DAR nonetheless */
h = (guint) gst_util_uint64_scale_int (set_w, den, num);
gst_structure_fixate_field_nearest_int (tmp, "height", h);
gst_structure_get_int (tmp, "height", &set_h);
gst_structure_free (tmp);
/* We kept the DAR and the width is nearest to the original width */
if (set_h == h) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, NULL);
goto done;
}
/* If all this failed, keep the height that was nearest to the orignal
* height and the nearest possible width. This changes the DAR but
* there's not much else to do here.
*/
gst_structure_set (outs, "width", G_TYPE_INT, f_w, "height", G_TYPE_INT,
f_h, NULL);
goto done;
} else {
GstStructure *tmp;
gint set_h, set_w, set_par_n, set_par_d, tmp2;
/* width, height and PAR are not fixed but passthrough is not possible */
/* First try to keep the height and width as good as possible
* and scale PAR */
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
gst_structure_get_int (tmp, "height", &set_h);
gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
gst_structure_get_int (tmp, "width", &set_w);
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, set_w,
&to_par_n, &to_par_d)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
to_par_n, to_par_d);
gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
&set_par_d);
gst_structure_free (tmp);
if (set_par_n == to_par_n && set_par_d == to_par_d) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
}
/* Otherwise try to scale width to keep the DAR with the set
* PAR and height */
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
set_par_n, &num, &den)) {
GST_ELEMENT_ERROR (base, CORE, NEGOTIATION, (NULL),
("Error calculating the output scaled size - integer overflow"));
goto done;
}
w = (guint) gst_util_uint64_scale_int (set_h, num, den);
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "width", w);
gst_structure_get_int (tmp, "width", &tmp2);
gst_structure_free (tmp);
if (tmp2 == w) {
gst_structure_set (outs, "width", G_TYPE_INT, tmp2, "height",
G_TYPE_INT, set_h, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
}
/* ... or try the same with the height */
h = (guint) gst_util_uint64_scale_int (set_w, den, num);
tmp = gst_structure_copy (outs);
gst_structure_fixate_field_nearest_int (tmp, "height", h);
gst_structure_get_int (tmp, "height", &tmp2);
gst_structure_free (tmp);
if (tmp2 == h) {
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, tmp2, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
goto done;
}
/* If all fails we can't keep the DAR and take the nearest values
* for everything from the first try */
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
G_TYPE_INT, set_h, "pixel-aspect-ratio", GST_TYPE_FRACTION,
set_par_n, set_par_d, NULL);
}
}
done:
GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
if (from_par == &fpar)
g_value_unset (&fpar);
if (to_par == &tpar)
g_value_unset (&tpar);
}
static void
gst_video_scale_setup_vs_image (VSImage * image, GstVideoFormat format,
gint component, gint width, gint height, gint b_w, gint b_h, uint8_t * data)
{
image->real_width =
gst_video_format_get_component_width (format, component, width);
image->real_height =
gst_video_format_get_component_height (format, component, height);
image->width =
gst_video_format_get_component_width (format, component, MAX (1,
width - b_w));
image->height =
gst_video_format_get_component_height (format, component, MAX (1,
height - b_h));
image->stride = gst_video_format_get_row_stride (format, component, width);
image->border_top = (image->real_height - image->height) / 2;
image->border_bottom = image->real_height - image->height - image->border_top;
if (format == GST_VIDEO_FORMAT_YUY2 || format == GST_VIDEO_FORMAT_YVYU
|| format == GST_VIDEO_FORMAT_UYVY) {
g_assert (component == 0);
image->border_left = (image->real_width - image->width) / 2;
if (image->border_left % 2 == 1)
image->border_left--;
image->border_right = image->real_width - image->width - image->border_left;
} else {
image->border_left = (image->real_width - image->width) / 2;
image->border_right = image->real_width - image->width - image->border_left;
}
if (format == GST_VIDEO_FORMAT_I420
|| format == GST_VIDEO_FORMAT_YV12
|| format == GST_VIDEO_FORMAT_Y444
|| format == GST_VIDEO_FORMAT_Y42B || format == GST_VIDEO_FORMAT_Y41B) {
image->real_pixels = data + gst_video_format_get_component_offset (format,
component, width, height);
} else {
g_assert (component == 0);
image->real_pixels = data;
}
image->pixels =
image->real_pixels + image->border_top * image->stride +
image->border_left * gst_video_format_get_pixel_stride (format,
component);
}
static const guint8 *
_get_black_for_format (GstVideoFormat format)
{
static const guint8 black[][4] = {
{255, 0, 0, 0}, /* 0 = ARGB, ABGR, xRGB, xBGR */
{0, 0, 0, 255}, /* 1 = RGBA, BGRA, RGBx, BGRx */
{255, 16, 128, 128}, /* 2 = AYUV */
{0, 0, 0, 0}, /* 3 = RGB and BGR */
{16, 128, 128, 0}, /* 4 = v301 */
{16, 128, 16, 128}, /* 5 = YUY2, YUYV */
{128, 16, 128, 16}, /* 6 = UYVY */
{16, 0, 0, 0}, /* 7 = Y */
{0, 0, 0, 0} /* 8 = RGB565, RGB666 */
};
switch (format) {
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
return black[0];
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
return black[1];
case GST_VIDEO_FORMAT_AYUV:
return black[2];
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
return black[3];
case GST_VIDEO_FORMAT_v308:
return black[4];
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_YVYU:
return black[5];
case GST_VIDEO_FORMAT_UYVY:
return black[6];
case GST_VIDEO_FORMAT_Y800:
case GST_VIDEO_FORMAT_GRAY8:
return black[7];
case GST_VIDEO_FORMAT_GRAY16_LE:
case GST_VIDEO_FORMAT_GRAY16_BE:
case GST_VIDEO_FORMAT_Y16:
return NULL; /* Handled by the caller */
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_Y444:
case GST_VIDEO_FORMAT_Y42B:
case GST_VIDEO_FORMAT_Y41B:
return black[4]; /* Y, U, V, 0 */
case GST_VIDEO_FORMAT_RGB16:
case GST_VIDEO_FORMAT_RGB15:
return black[8];
default:
return NULL;
}
}
static GstFlowReturn
gst_video_scale_transform (GstBaseTransform * trans, GstBuffer * in,
GstBuffer * out)
{
GstVideoScale *videoscale = GST_VIDEO_SCALE (trans);
GstFlowReturn ret = GST_FLOW_OK;
VSImage dest = { NULL, };
VSImage src = { NULL, };
VSImage dest_u = { NULL, };
VSImage dest_v = { NULL, };
VSImage src_u = { NULL, };
VSImage src_v = { NULL, };
gint method;
const guint8 *black = _get_black_for_format (videoscale->format);
gboolean add_borders;
GST_OBJECT_LOCK (videoscale);
method = videoscale->method;
add_borders = videoscale->add_borders;
GST_OBJECT_UNLOCK (videoscale);
gst_video_scale_setup_vs_image (&src, videoscale->format, 0,
videoscale->from_width, videoscale->from_height, 0, 0,
GST_BUFFER_DATA (in));
gst_video_scale_setup_vs_image (&dest, videoscale->format, 0,
videoscale->to_width, videoscale->to_height, videoscale->borders_w,
videoscale->borders_h, GST_BUFFER_DATA (out));
if (videoscale->format == GST_VIDEO_FORMAT_I420
|| videoscale->format == GST_VIDEO_FORMAT_YV12
|| videoscale->format == GST_VIDEO_FORMAT_Y444
|| videoscale->format == GST_VIDEO_FORMAT_Y42B
|| videoscale->format == GST_VIDEO_FORMAT_Y41B) {
gst_video_scale_setup_vs_image (&src_u, videoscale->format, 1,
videoscale->from_width, videoscale->from_height, 0, 0,
GST_BUFFER_DATA (in));
gst_video_scale_setup_vs_image (&src_v, videoscale->format, 2,
videoscale->from_width, videoscale->from_height, 0, 0,
GST_BUFFER_DATA (in));
gst_video_scale_setup_vs_image (&dest_u, videoscale->format, 1,
videoscale->to_width, videoscale->to_height, videoscale->borders_w,
videoscale->borders_h, GST_BUFFER_DATA (out));
gst_video_scale_setup_vs_image (&dest_v, videoscale->format, 2,
videoscale->to_width, videoscale->to_height, videoscale->borders_w,
videoscale->borders_h, GST_BUFFER_DATA (out));
}
switch (videoscale->format) {
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_BGRx:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_AYUV:
if (add_borders)
vs_fill_borders_RGBA (&dest, black);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_RGBA (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_RGBA (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_RGBA (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_RGB:
case GST_VIDEO_FORMAT_BGR:
case GST_VIDEO_FORMAT_v308:
if (add_borders)
vs_fill_borders_RGB (&dest, black);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_RGB (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_RGB (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_RGB (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_YUY2:
case GST_VIDEO_FORMAT_YVYU:
if (add_borders)
vs_fill_borders_YUYV (&dest, black);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_YUYV (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_YUYV (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_YUYV (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_UYVY:
if (add_borders)
vs_fill_borders_UYVY (&dest, black);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_UYVY (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_UYVY (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_UYVY (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_Y800:
case GST_VIDEO_FORMAT_GRAY8:
if (add_borders)
vs_fill_borders_Y (&dest, black);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_Y (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_Y (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_Y (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_GRAY16_LE:
case GST_VIDEO_FORMAT_GRAY16_BE:
case GST_VIDEO_FORMAT_Y16:
if (add_borders)
vs_fill_borders_Y16 (&dest, 0);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_Y16 (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_Y16 (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_Y16 (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_I420:
case GST_VIDEO_FORMAT_YV12:
case GST_VIDEO_FORMAT_Y444:
case GST_VIDEO_FORMAT_Y42B:
case GST_VIDEO_FORMAT_Y41B:
if (add_borders) {
vs_fill_borders_Y (&dest, black);
vs_fill_borders_Y (&dest_u, black + 1);
vs_fill_borders_Y (&dest_v, black + 2);
}
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_Y (&dest, &src, videoscale->tmp_buf);
vs_image_scale_nearest_Y (&dest_u, &src_u, videoscale->tmp_buf);
vs_image_scale_nearest_Y (&dest_v, &src_v, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_Y (&dest, &src, videoscale->tmp_buf);
vs_image_scale_linear_Y (&dest_u, &src_u, videoscale->tmp_buf);
vs_image_scale_linear_Y (&dest_v, &src_v, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_Y (&dest, &src, videoscale->tmp_buf);
vs_image_scale_4tap_Y (&dest_u, &src_u, videoscale->tmp_buf);
vs_image_scale_4tap_Y (&dest_v, &src_v, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_RGB16:
if (add_borders)
vs_fill_borders_RGB565 (&dest, black);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_RGB565 (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_RGB565 (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_RGB565 (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
case GST_VIDEO_FORMAT_RGB15:
if (add_borders)
vs_fill_borders_RGB555 (&dest, black);
switch (method) {
case GST_VIDEO_SCALE_NEAREST:
vs_image_scale_nearest_RGB555 (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_BILINEAR:
vs_image_scale_linear_RGB555 (&dest, &src, videoscale->tmp_buf);
break;
case GST_VIDEO_SCALE_4TAP:
vs_image_scale_4tap_RGB555 (&dest, &src, videoscale->tmp_buf);
break;
default:
goto unknown_mode;
}
break;
default:
goto unsupported;
}
GST_LOG_OBJECT (videoscale, "pushing buffer of %d bytes",
GST_BUFFER_SIZE (out));
return ret;
/* ERRORS */
unsupported:
{
GST_ELEMENT_ERROR (videoscale, STREAM, NOT_IMPLEMENTED, (NULL),
("Unsupported format %d for scaling method %d",
videoscale->format, method));
return GST_FLOW_ERROR;
}
unknown_mode:
{
GST_ELEMENT_ERROR (videoscale, STREAM, NOT_IMPLEMENTED, (NULL),
("Unknown scaling method %d", videoscale->method));
return GST_FLOW_ERROR;
}
}
static gboolean
gst_video_scale_src_event (GstBaseTransform * trans, GstEvent * event)
{
GstVideoScale *videoscale = GST_VIDEO_SCALE (trans);
gboolean ret;
gdouble a;
GstStructure *structure;
GST_DEBUG_OBJECT (videoscale, "handling %s event",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NAVIGATION:
event =
GST_EVENT (gst_mini_object_make_writable (GST_MINI_OBJECT (event)));
structure = (GstStructure *) gst_event_get_structure (event);
if (gst_structure_get_double (structure, "pointer_x", &a)) {
gst_structure_set (structure, "pointer_x", G_TYPE_DOUBLE,
a * videoscale->from_width / videoscale->to_width, NULL);
}
if (gst_structure_get_double (structure, "pointer_y", &a)) {
gst_structure_set (structure, "pointer_y", G_TYPE_DOUBLE,
a * videoscale->from_height / videoscale->to_height, NULL);
}
break;
default:
break;
}
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->src_event (trans, event);
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "videoscale", GST_RANK_NONE,
GST_TYPE_VIDEO_SCALE))
return FALSE;
GST_DEBUG_CATEGORY_INIT (video_scale_debug, "videoscale", 0,
"videoscale element");
vs_4tap_init ();
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"videoscale",
"Resizes video", plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN)
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