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gstreamer/gst/smpte/gstsmpte.c
Tim-Philipp Müller 230cf41cc9 Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-04 00:07:18 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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-smpte
*
* smpte can accept I420 video streams with the same width, height and
* framerate. The two incomming buffers are blended together using an effect
* specific alpha mask.
*
* The #GstSmpte:depth property defines the presision in bits of the mask. A
* higher presision will create a mask with smoother gradients in order to avoid
* banding.
*
* <refsect2>
* <title>Sample pipelines</title>
* |[
* gst-launch-1.0 -v videotestsrc pattern=1 ! smpte name=s border=20000 type=234 duration=2000000000 ! videoconvert ! ximagesink videotestsrc ! s.
* ]| A pipeline to demonstrate the smpte transition.
* It shows a pinwheel transition a from a snow videotestsrc to an smpte
* pattern videotestsrc. The transition will take 2 seconds to complete. The
* edges of the transition are smoothed with a 20000 big border.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstsmpte.h"
#include "paint.h"
GST_DEBUG_CATEGORY_STATIC (gst_smpte_debug);
#define GST_CAT_DEFAULT gst_smpte_debug
static GstStaticPadTemplate gst_smpte_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420")
)
);
static GstStaticPadTemplate gst_smpte_sink1_template =
GST_STATIC_PAD_TEMPLATE ("sink1",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420")
)
);
static GstStaticPadTemplate gst_smpte_sink2_template =
GST_STATIC_PAD_TEMPLATE ("sink2",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("I420")
)
);
/* SMPTE signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
#define DEFAULT_PROP_TYPE 1
#define DEFAULT_PROP_BORDER 0
#define DEFAULT_PROP_DEPTH 16
#define DEFAULT_PROP_DURATION GST_SECOND
#define DEFAULT_PROP_INVERT FALSE
enum
{
PROP_0,
PROP_TYPE,
PROP_BORDER,
PROP_DEPTH,
PROP_DURATION,
PROP_INVERT,
PROP_LAST,
};
/* FIXME: should use video meta etc. */
#define I420_Y_ROWSTRIDE(width) (GST_ROUND_UP_4(width))
#define I420_U_ROWSTRIDE(width) (GST_ROUND_UP_8(width)/2)
#define I420_V_ROWSTRIDE(width) ((GST_ROUND_UP_8(I420_Y_ROWSTRIDE(width)))/2)
#define I420_Y_OFFSET(w,h) (0)
#define I420_U_OFFSET(w,h) (I420_Y_OFFSET(w,h)+(I420_Y_ROWSTRIDE(w)*GST_ROUND_UP_2(h)))
#define I420_V_OFFSET(w,h) (I420_U_OFFSET(w,h)+(I420_U_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
#define I420_SIZE(w,h) (I420_V_OFFSET(w,h)+(I420_V_ROWSTRIDE(w)*GST_ROUND_UP_2(h)/2))
#define GST_TYPE_SMPTE_TRANSITION_TYPE (gst_smpte_transition_type_get_type())
static GType
gst_smpte_transition_type_get_type (void)
{
static GType smpte_transition_type = 0;
GEnumValue *smpte_transitions;
if (!smpte_transition_type) {
const GList *definitions;
gint i = 0;
definitions = gst_mask_get_definitions ();
smpte_transitions =
g_new0 (GEnumValue, g_list_length ((GList *) definitions) + 1);
while (definitions) {
GstMaskDefinition *definition = (GstMaskDefinition *) definitions->data;
definitions = g_list_next (definitions);
smpte_transitions[i].value = definition->type;
/* older GLib versions have the two fields as non-const, hence the cast */
smpte_transitions[i].value_nick = (gchar *) definition->short_name;
smpte_transitions[i].value_name = (gchar *) definition->long_name;
i++;
}
smpte_transition_type =
g_enum_register_static ("GstSMPTETransitionType", smpte_transitions);
}
return smpte_transition_type;
}
static void gst_smpte_finalize (GstSMPTE * smpte);
static GstFlowReturn gst_smpte_collected (GstCollectPads * pads,
GstSMPTE * smpte);
static void gst_smpte_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_smpte_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_smpte_change_state (GstElement * element,
GstStateChange transition);
/*static guint gst_smpte_signals[LAST_SIGNAL] = { 0 }; */
#define gst_smpte_parent_class parent_class
G_DEFINE_TYPE (GstSMPTE, gst_smpte, GST_TYPE_ELEMENT);
static void
gst_smpte_class_init (GstSMPTEClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->set_property = gst_smpte_set_property;
gobject_class->get_property = gst_smpte_get_property;
gobject_class->finalize = (GObjectFinalizeFunc) gst_smpte_finalize;
_gst_mask_init ();
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TYPE,
g_param_spec_enum ("type", "Type", "The type of transition to use",
GST_TYPE_SMPTE_TRANSITION_TYPE, DEFAULT_PROP_TYPE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BORDER,
g_param_spec_int ("border", "Border",
"The border width of the transition", 0, G_MAXINT,
DEFAULT_PROP_BORDER, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DEPTH,
g_param_spec_int ("depth", "Depth", "Depth of the mask in bits", 1, 24,
DEFAULT_PROP_DEPTH, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_DURATION,
g_param_spec_uint64 ("duration", "Duration",
"Duration of the transition effect in nanoseconds", 0, G_MAXUINT64,
DEFAULT_PROP_DURATION, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_INVERT,
g_param_spec_boolean ("invert", "Invert",
"Invert transition mask", DEFAULT_PROP_INVERT,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_smpte_change_state);
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_smpte_sink1_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_smpte_sink2_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_smpte_src_template));
gst_element_class_set_static_metadata (gstelement_class, "SMPTE transitions",
"Filter/Editor/Video",
"Apply the standard SMPTE transitions on video images",
"Wim Taymans <wim.taymans@chello.be>");
}
/* wht yel cya grn mag red blu blk -I Q */
static const int y_colors[] = { 255, 226, 179, 150, 105, 76, 29, 16, 16, 0 };
static const int u_colors[] = { 128, 0, 170, 46, 212, 85, 255, 128, 0, 128 };
static const int v_colors[] = { 128, 155, 0, 21, 235, 255, 107, 128, 128, 255 };
static void
fill_i420 (guint8 * data, gint width, gint height, gint color)
{
gint size = I420_Y_ROWSTRIDE (width) * GST_ROUND_UP_2 (height);
gint size4 = size >> 2;
guint8 *yp = data;
guint8 *up = data + I420_U_OFFSET (width, height);
guint8 *vp = data + I420_V_OFFSET (width, height);
memset (yp, y_colors[color], size);
memset (up, u_colors[color], size4);
memset (vp, v_colors[color], size4);
}
static gboolean
gst_smpte_update_mask (GstSMPTE * smpte, gint type, gboolean invert,
gint depth, gint width, gint height)
{
GstMask *newmask;
if (smpte->mask) {
if (smpte->type == type &&
smpte->invert == invert &&
smpte->depth == depth &&
smpte->width == width && smpte->height == height)
return TRUE;
}
newmask = gst_mask_factory_new (type, invert, depth, width, height);
if (newmask) {
if (smpte->mask) {
gst_mask_destroy (smpte->mask);
}
smpte->mask = newmask;
smpte->type = type;
smpte->invert = invert;
smpte->depth = depth;
smpte->width = width;
smpte->height = height;
return TRUE;
}
return FALSE;
}
static gboolean
gst_smpte_setcaps (GstPad * pad, GstCaps * caps)
{
GstSMPTE *smpte;
gboolean ret;
GstVideoInfo vinfo;
smpte = GST_SMPTE (GST_PAD_PARENT (pad));
gst_video_info_init (&vinfo);
if (!gst_video_info_from_caps (&vinfo, caps))
return FALSE;
smpte->width = GST_VIDEO_INFO_WIDTH (&vinfo);
smpte->height = GST_VIDEO_INFO_HEIGHT (&vinfo);
smpte->fps_num = GST_VIDEO_INFO_FPS_N (&vinfo);
smpte->fps_denom = GST_VIDEO_INFO_FPS_D (&vinfo);
/* figure out the duration in frames */
smpte->end_position = gst_util_uint64_scale (smpte->duration,
smpte->fps_num, GST_SECOND * smpte->fps_denom);
GST_DEBUG_OBJECT (smpte, "duration: %d frames", smpte->end_position);
ret =
gst_smpte_update_mask (smpte, smpte->type, smpte->invert, smpte->depth,
smpte->width, smpte->height);
if (pad == smpte->sinkpad1) {
GST_DEBUG_OBJECT (smpte, "setting pad1 info");
smpte->vinfo1 = vinfo;
} else {
GST_DEBUG_OBJECT (smpte, "setting pad2 info");
smpte->vinfo2 = vinfo;
}
return ret;
}
static gboolean
gst_smpte_sink_event (GstCollectPads * pads,
GstCollectData * data, GstEvent * event, gpointer user_data)
{
GstPad *pad;
gboolean ret = FALSE;
pad = data->pad;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_smpte_setcaps (pad, caps);
gst_event_unref (event);
event = NULL;
break;
}
default:
break;
}
if (event != NULL)
return gst_collect_pads_event_default (pads, data, event, FALSE);
return ret;
}
static void
gst_smpte_init (GstSMPTE * smpte)
{
smpte->sinkpad1 =
gst_pad_new_from_static_template (&gst_smpte_sink1_template, "sink1");
GST_PAD_SET_PROXY_CAPS (smpte->sinkpad1);
gst_element_add_pad (GST_ELEMENT (smpte), smpte->sinkpad1);
smpte->sinkpad2 =
gst_pad_new_from_static_template (&gst_smpte_sink2_template, "sink2");
GST_PAD_SET_PROXY_CAPS (smpte->sinkpad2);
gst_element_add_pad (GST_ELEMENT (smpte), smpte->sinkpad2);
smpte->srcpad =
gst_pad_new_from_static_template (&gst_smpte_src_template, "src");
gst_element_add_pad (GST_ELEMENT (smpte), smpte->srcpad);
smpte->collect = gst_collect_pads_new ();
gst_collect_pads_set_function (smpte->collect,
(GstCollectPadsFunction) GST_DEBUG_FUNCPTR (gst_smpte_collected), smpte);
gst_collect_pads_set_event_function (smpte->collect,
GST_DEBUG_FUNCPTR (gst_smpte_sink_event), smpte);
gst_collect_pads_add_pad (smpte->collect, smpte->sinkpad1,
sizeof (GstCollectData), NULL, TRUE);
gst_collect_pads_add_pad (smpte->collect, smpte->sinkpad2,
sizeof (GstCollectData), NULL, TRUE);
smpte->type = DEFAULT_PROP_TYPE;
smpte->border = DEFAULT_PROP_BORDER;
smpte->depth = DEFAULT_PROP_DEPTH;
smpte->duration = DEFAULT_PROP_DURATION;
smpte->invert = DEFAULT_PROP_INVERT;
smpte->fps_num = 0;
smpte->fps_denom = 1;
}
static void
gst_smpte_finalize (GstSMPTE * smpte)
{
if (smpte->collect) {
gst_object_unref (smpte->collect);
}
G_OBJECT_CLASS (parent_class)->finalize ((GObject *) smpte);
}
static void
gst_smpte_reset (GstSMPTE * smpte)
{
smpte->width = -1;
smpte->height = -1;
smpte->position = 0;
smpte->end_position = 0;
smpte->send_stream_start = TRUE;
}
static void
gst_smpte_blend_i420 (GstVideoFrame * frame1, GstVideoFrame * frame2,
GstVideoFrame * oframe, GstMask * mask, gint border, gint pos)
{
guint32 *maskp;
gint value;
gint i, j;
gint min, max;
guint8 *in1, *in2, *out, *in1u, *in1v, *in2u, *in2v, *outu, *outv;
gint width, height;
if (border == 0)
border++;
min = pos - border;
max = pos;
width = GST_VIDEO_FRAME_WIDTH (frame1);
height = GST_VIDEO_FRAME_HEIGHT (frame1);
in1 = GST_VIDEO_FRAME_COMP_DATA (frame1, 0);
in2 = GST_VIDEO_FRAME_COMP_DATA (frame2, 0);
out = GST_VIDEO_FRAME_COMP_DATA (oframe, 0);
in1u = GST_VIDEO_FRAME_COMP_DATA (frame1, 1);
in1v = GST_VIDEO_FRAME_COMP_DATA (frame1, 2);
in2u = GST_VIDEO_FRAME_COMP_DATA (frame2, 1);
in2v = GST_VIDEO_FRAME_COMP_DATA (frame2, 2);
outu = GST_VIDEO_FRAME_COMP_DATA (oframe, 1);
outv = GST_VIDEO_FRAME_COMP_DATA (oframe, 2);
maskp = mask->data;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
value = *maskp++;
value = ((CLAMP (value, min, max) - min) << 8) / border;
out[j] = ((in1[j] * value) + (in2[j] * (256 - value))) >> 8;
if (!(i & 1) && !(j & 1)) {
outu[j / 2] =
((in1u[j / 2] * value) + (in2u[j / 2] * (256 - value))) >> 8;
outv[j / 2] =
((in1v[j / 2] * value) + (in2v[j / 2] * (256 - value))) >> 8;
}
}
in1 += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 0);
in2 += GST_VIDEO_FRAME_COMP_STRIDE (frame2, 0);
out += GST_VIDEO_FRAME_COMP_STRIDE (oframe, 0);
if (!(i & 1)) {
in1u += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 1);
in2u += GST_VIDEO_FRAME_COMP_STRIDE (frame2, 1);
in1v += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 2);
in2v += GST_VIDEO_FRAME_COMP_STRIDE (frame1, 2);
outu += GST_VIDEO_FRAME_COMP_STRIDE (oframe, 1);
outv += GST_VIDEO_FRAME_COMP_STRIDE (oframe, 2);
}
}
}
static GstFlowReturn
gst_smpte_collected (GstCollectPads * pads, GstSMPTE * smpte)
{
GstBuffer *outbuf;
GstClockTime ts;
GstBuffer *in1 = NULL, *in2 = NULL;
GSList *collected;
GstMapInfo map;
GstVideoFrame frame1, frame2, oframe;
if (G_UNLIKELY (smpte->fps_num == 0))
goto not_negotiated;
if (!gst_pad_has_current_caps (smpte->sinkpad1) ||
!gst_pad_has_current_caps (smpte->sinkpad2))
goto not_negotiated;
if (smpte->send_stream_start) {
gchar s_id[32];
/* stream-start (FIXME: create id based on input ids) */
g_snprintf (s_id, sizeof (s_id), "smpte-%08x", g_random_int ());
gst_pad_push_event (smpte->srcpad, gst_event_new_stream_start (s_id));
smpte->send_stream_start = FALSE;
}
ts = gst_util_uint64_scale_int (smpte->position * GST_SECOND,
smpte->fps_denom, smpte->fps_num);
for (collected = pads->data; collected; collected = g_slist_next (collected)) {
GstCollectData *data;
data = (GstCollectData *) collected->data;
if (data->pad == smpte->sinkpad1)
in1 = gst_collect_pads_pop (pads, data);
else if (data->pad == smpte->sinkpad2)
in2 = gst_collect_pads_pop (pads, data);
}
if (in1 == NULL) {
/* if no input, make picture black */
in1 = gst_buffer_new_and_alloc (I420_SIZE (smpte->width, smpte->height));
gst_buffer_map (in1, &map, GST_MAP_WRITE);
fill_i420 (map.data, smpte->width, smpte->height, 7);
gst_buffer_unmap (in1, &map);
}
if (in2 == NULL) {
/* if no input, make picture white */
in2 = gst_buffer_new_and_alloc (I420_SIZE (smpte->width, smpte->height));
gst_buffer_map (in2, &map, GST_MAP_WRITE);
fill_i420 (map.data, smpte->width, smpte->height, 0);
gst_buffer_unmap (in1, &map);
}
if (GST_VIDEO_INFO_WIDTH (&smpte->vinfo1) !=
GST_VIDEO_INFO_WIDTH (&smpte->vinfo2) ||
GST_VIDEO_INFO_HEIGHT (&smpte->vinfo1) !=
GST_VIDEO_INFO_HEIGHT (&smpte->vinfo2))
goto input_formats_do_not_match;
if (smpte->position < smpte->end_position) {
outbuf = gst_buffer_new_and_alloc (I420_SIZE (smpte->width, smpte->height));
/* set caps if not done yet */
if (!gst_pad_has_current_caps (smpte->srcpad)) {
GstCaps *caps;
GstSegment segment;
caps =
gst_caps_make_writable (gst_static_caps_get
(&gst_smpte_src_template.static_caps));
gst_caps_set_simple (caps, "width", G_TYPE_INT, smpte->width, "height",
G_TYPE_INT, smpte->height, "framerate", GST_TYPE_FRACTION,
smpte->fps_num, smpte->fps_denom, NULL);
gst_pad_set_caps (smpte->srcpad, caps);
gst_caps_unref (caps);
gst_segment_init (&segment, GST_FORMAT_TIME);
gst_pad_push_event (smpte->srcpad, gst_event_new_segment (&segment));
}
gst_video_frame_map (&frame1, &smpte->vinfo1, in1, GST_MAP_READ);
gst_video_frame_map (&frame2, &smpte->vinfo2, in2, GST_MAP_READ);
/* re-use either info, now know they are essentially identical */
gst_video_frame_map (&oframe, &smpte->vinfo1, outbuf, GST_MAP_WRITE);
gst_smpte_blend_i420 (&frame1, &frame2, &oframe, smpte->mask, smpte->border,
((1 << smpte->depth) + smpte->border) *
smpte->position / smpte->end_position);
gst_video_frame_unmap (&frame1);
gst_video_frame_unmap (&frame2);
gst_video_frame_unmap (&oframe);
} else {
outbuf = in2;
gst_buffer_ref (in2);
}
smpte->position++;
if (in1)
gst_buffer_unref (in1);
if (in2)
gst_buffer_unref (in2);
GST_BUFFER_TIMESTAMP (outbuf) = ts;
return gst_pad_push (smpte->srcpad, outbuf);
/* ERRORS */
not_negotiated:
{
GST_ELEMENT_ERROR (smpte, CORE, NEGOTIATION, (NULL),
("No input format negotiated"));
return GST_FLOW_NOT_NEGOTIATED;
}
input_formats_do_not_match:
{
GstCaps *caps1, *caps2;
caps1 = gst_pad_get_current_caps (smpte->sinkpad1);
caps2 = gst_pad_get_current_caps (smpte->sinkpad2);
GST_ELEMENT_ERROR (smpte, CORE, NEGOTIATION, (NULL),
("input formats don't match: %" GST_PTR_FORMAT " vs. %" GST_PTR_FORMAT,
caps1, caps2));
gst_caps_unref (caps1);
gst_caps_unref (caps2);
return GST_FLOW_ERROR;
}
}
static void
gst_smpte_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstSMPTE *smpte;
smpte = GST_SMPTE (object);
switch (prop_id) {
case PROP_TYPE:
smpte->type = g_value_get_enum (value);
break;
case PROP_BORDER:
smpte->border = g_value_get_int (value);
break;
case PROP_DEPTH:
smpte->depth = g_value_get_int (value);
break;
case PROP_DURATION:
smpte->duration = g_value_get_uint64 (value);
break;
case PROP_INVERT:
smpte->invert = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_smpte_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstSMPTE *smpte;
smpte = GST_SMPTE (object);
switch (prop_id) {
case PROP_TYPE:
g_value_set_enum (value, smpte->type);
break;
case PROP_BORDER:
g_value_set_int (value, smpte->border);
break;
case PROP_DEPTH:
g_value_set_int (value, smpte->depth);
break;
case PROP_DURATION:
g_value_set_uint64 (value, smpte->duration);
break;
case PROP_INVERT:
g_value_set_boolean (value, smpte->invert);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstStateChangeReturn
gst_smpte_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstSMPTE *smpte;
smpte = GST_SMPTE (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_smpte_reset (smpte);
GST_LOG_OBJECT (smpte, "starting collectpads");
gst_collect_pads_start (smpte->collect);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_LOG_OBJECT (smpte, "stopping collectpads");
gst_collect_pads_stop (smpte->collect);
break;
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_smpte_reset (smpte);
break;
default:
break;
}
return ret;
}
gboolean
gst_smpte_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_smpte_debug, "smpte", 0,
"SMPTE transition effect");
return gst_element_register (plugin, "smpte", GST_RANK_NONE, GST_TYPE_SMPTE);
}
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