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gstreamer/gst/deinterlace/gstdeinterlace.c

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/* GStreamer simple deinterlacing plugin
* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2006-2008 Tim-Philipp Müller <tim centricular net>
*
* 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.
*/
/* based on the Area Based Deinterlacer (for RGB frames) */
/* (a VirtualDub filter) from Gunnar Thalin <guth@home.se> */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "gstdeinterlace.h"
#include <gst/video/video.h>
/**
* SECTION:element-deinterlace
*
* Adaptively deinterlaces video frames by detecting interlacing artifacts.
* An edge detection matrix is used, with a threshold value. Pixels detected
* as 'interlaced' are replaced with pixels blended from the pixels above and
* below.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch -v videotestsrc ! deinterlace ! ffmpegcolorspace ! xvimagesink
* ]|
* </refsect2>
*/
GST_DEBUG_CATEGORY_STATIC (deinterlace_debug);
#define GST_CAT_DEFAULT deinterlace_debug
#define DEFAULT_DI_AREA_ONLY FALSE
#define DEFAULT_NI_AREA_ONLY FALSE
#define DEFAULT_BLEND FALSE
#define DEFAULT_DEINTERLACE TRUE
#define DEFAULT_THRESHOLD 20
#define DEFAULT_EDGE_DETECT 25
enum
{
ARG_0,
ARG_DI_ONLY,
ARG_NI_ONLY,
ARG_BLEND,
ARG_THRESHOLD,
ARG_EDGE_DETECT,
ARG_DEINTERLACE
};
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ I420, Y42B }"))
);
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("{ I420, Y42B }"))
);
GST_BOILERPLATE (GstDeinterlace, gst_deinterlace, GstBaseTransform,
GST_TYPE_BASE_TRANSFORM);
static void gst_deinterlace_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_deinterlace_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstFlowReturn gst_deinterlace_transform_ip (GstBaseTransform * trans,
GstBuffer * buf);
static gboolean gst_deinterlace_stop (GstBaseTransform * trans);
static gboolean gst_deinterlace_set_caps (GstBaseTransform * trans,
GstCaps * incaps, GstCaps * outcaps);
static GstCaps *gst_deinterlace_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * incaps);
static void
gst_deinterlace_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_factory));
gst_element_class_set_details_simple (element_class, "Deinterlace",
"Filter/Effect/Video", "Deinterlace video",
"Wim Taymans <wim.taymans@gmail.com>");
}
static void
gst_deinterlace_class_init (GstDeinterlaceClass * klass)
{
GObjectClass *gobject_class;
GstBaseTransformClass *basetransform_class;
gobject_class = (GObjectClass *) klass;
basetransform_class = (GstBaseTransformClass *) klass;
gobject_class->set_property = gst_deinterlace_set_property;
gobject_class->get_property = gst_deinterlace_get_property;
/**
* GstDeinterlace:deinterlace:
*
* Turn processing on/off. When false, no modification of the
* video frames occurs and they pass through intact.
*/
g_object_class_install_property (gobject_class, ARG_DEINTERLACE,
g_param_spec_boolean ("deinterlace", "deinterlace",
"turn deinterlacing on/off", DEFAULT_DEINTERLACE, G_PARAM_READWRITE));
/**
* GstDeinterlace:di-area-only:
*
* When set to true, only areas affected by the deinterlacing are output,
* making it easy to see which regions are being modified.
*
* See Also: #GstDeinterlace:ni-area-only
*/
g_object_class_install_property (gobject_class, ARG_DI_ONLY,
g_param_spec_boolean ("di-area-only", "di-area-only",
"displays deinterlaced areas only", DEFAULT_DI_AREA_ONLY,
G_PARAM_READWRITE));
/**
* GstDeinterlace:ni-area-only:
*
* When set to true, only areas unaffected by the deinterlacing are output,
* making it easy to see which regions are being preserved intact.
*
* See Also: #GstDeinterlace:di-area-only
*/
g_object_class_install_property (gobject_class, ARG_NI_ONLY,
g_param_spec_boolean ("ni-area-only", "ni-area-only",
"displays non-interlaced areas only", DEFAULT_DI_AREA_ONLY,
G_PARAM_READWRITE));
/**
* GstDeinterlace:blend:
*
* Change the blending for pixels which are detected as
* 'interlacing artifacts'. When true, the output pixel is a weighted
* average (1,2,1) of the pixel and the pixels above and below it.
* When false, the odd field lines are preserved, and the even field lines
* are averaged from the surrounding pixels above and below (the odd field).
*/
g_object_class_install_property (gobject_class, ARG_BLEND,
g_param_spec_boolean ("blend", "blend", "blend", DEFAULT_BLEND,
G_PARAM_READWRITE));
/**
* GstDeinterlace:threshold:
*
* Affects the threshold of the edge-detection function used for detecting
* interlacing artifacts.
*/
g_object_class_install_property (gobject_class, ARG_THRESHOLD,
g_param_spec_int ("threshold", "Edge-detection threshold",
"Threshold value for the interlacing artifacts in the output "
"of the edge detection", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE));
/**
* GstDeinterlace:edge-detect:
*
* Affects the weighting of the edge-detection function used for detecting
* interlacing artifacts.
*/
g_object_class_install_property (gobject_class, ARG_EDGE_DETECT,
g_param_spec_int ("edge-detect", "edge detection weighting",
"Weighting value used for calculating the edge detection matrix",
G_MININT, G_MAXINT, 0, G_PARAM_READWRITE));
basetransform_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_deinterlace_transform_ip);
basetransform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_deinterlace_transform_caps);
basetransform_class->stop = GST_DEBUG_FUNCPTR (gst_deinterlace_stop);
basetransform_class->set_caps = GST_DEBUG_FUNCPTR (gst_deinterlace_set_caps);
}
static void
gst_deinterlace_init (GstDeinterlace * filter, GstDeinterlaceClass * klass)
{
filter->show_deinterlaced_area_only = DEFAULT_DI_AREA_ONLY;
filter->show_noninterlaced_area_only = DEFAULT_NI_AREA_ONLY;
filter->blend = DEFAULT_BLEND;
filter->deinterlace = DEFAULT_DEINTERLACE;
filter->threshold = DEFAULT_THRESHOLD;
filter->edge_detect = DEFAULT_EDGE_DETECT;
/*filter->threshold_blend = 0; */
filter->src = NULL;
filter->picsize = 0;
}
static gboolean
gst_deinterlace_stop (GstBaseTransform * trans)
{
GstDeinterlace *filter;
filter = GST_DEINTERLACE (trans);
g_free (filter->src);
filter->src = NULL;
filter->picsize = 0;
filter->width = 0;
filter->height = 0;
return TRUE;
}
static GstCaps *
gst_deinterlace_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * incaps)
{
return gst_caps_ref (incaps);
}
static gboolean
gst_deinterlace_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstDeinterlace *filter;
GstVideoFormat fmt;
GstStructure *s;
guint32 fourcc;
gint picsize, w, h;
filter = GST_DEINTERLACE (trans);
g_assert (gst_caps_is_equal_fixed (incaps, outcaps));
s = gst_caps_get_structure (incaps, 0);
if (!gst_structure_get_int (s, "width", &w) ||
!gst_structure_get_int (s, "height", &h) ||
!gst_structure_get_fourcc (s, "format", &fourcc)) {
return FALSE;
}
filter->width = w;
filter->height = h;
filter->fourcc = fourcc;
GST_DEBUG_OBJECT (filter, "width x height = %d x %d, fourcc: %"
GST_FOURCC_FORMAT, w, h, GST_FOURCC_ARGS (fourcc));
fmt = gst_video_format_from_fourcc (fourcc);
filter->y_stride = gst_video_format_get_row_stride (fmt, 0, w);
filter->u_stride = gst_video_format_get_row_stride (fmt, 1, w);
filter->v_stride = gst_video_format_get_row_stride (fmt, 2, w);
filter->uv_height = gst_video_format_get_component_height (fmt, 1, h);
filter->y_off = gst_video_format_get_component_offset (fmt, 0, w, h);
filter->u_off = gst_video_format_get_component_offset (fmt, 1, w, h);
filter->v_off = gst_video_format_get_component_offset (fmt, 2, w, h);
picsize = gst_video_format_get_size (fmt, w, h);
if (filter->picsize != picsize) {
filter->picsize = picsize;
g_free (filter->src); /* free + alloc avoids memcpy */
filter->src = g_malloc0 (filter->picsize);
GST_LOG_OBJECT (filter, "temp buffer size %d", filter->picsize);
}
return TRUE;
}
static GstFlowReturn
gst_deinterlace_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstDeinterlace *filter;
gboolean bShowDeinterlacedAreaOnly;
gboolean bShowNoninterlacedAreaOnly;
gint y0, y1, y2, y3;
guchar *psrc1, *pdst1, *yuvptr, *src;
gint iInterlaceValue0, iInterlaceValue1, iInterlaceValue2;
gint x, y, p;
gint y_line;
guchar *y_dst, *y_src;
guchar fill_value;
gboolean bBlend;
gboolean bDeinterlace;
gint iThreshold;
gint iEdgeDetect;
gint width, height;
/* g_assert (gst_buffer_is_writable (buf)); */
filter = GST_DEINTERLACE (trans);
GST_OBJECT_LOCK (filter);
bBlend = filter->blend;
bDeinterlace = filter->deinterlace;
iThreshold = filter->threshold;
iEdgeDetect = filter->edge_detect;
bShowDeinterlacedAreaOnly = filter->show_deinterlaced_area_only;
bShowNoninterlacedAreaOnly = filter->show_noninterlaced_area_only;
GST_OBJECT_UNLOCK (filter);
src = filter->src;
yuvptr = GST_BUFFER_DATA (buf);
memcpy (filter->src, yuvptr, filter->picsize);
iThreshold = iThreshold * iThreshold * 4;
/* We don't want an integer overflow in the interlace calculation. */
if (iEdgeDetect > 180)
iEdgeDetect = 180;
iEdgeDetect = iEdgeDetect * iEdgeDetect;
for (p = 0; p < 3; p++) {
switch (p) {
case 0:
y_dst = yuvptr + filter->y_off; /* dst y pointer */
y_line = filter->y_stride;
y_src = src + filter->y_off;
width = filter->width;
height = filter->height;
fill_value = 0;
break;
case 1:
y_dst = yuvptr + filter->u_off; /* dst U pointer */
y_line = filter->u_stride;
y_src = src + filter->u_off;
width = filter->width / 2;
height = filter->uv_height;
fill_value = 128;
break;
case 2:
y_dst = yuvptr + filter->v_off; /* dst V pointer */
y_line = filter->v_stride;
y_src = src + filter->v_off;
width = filter->width / 2;
height = filter->uv_height;
fill_value = 128;
break;
default:
g_assert_not_reached ();
break;
}
for (x = 0; x < width; x++) {
pdst1 = y_dst + x;
psrc1 = y_src + x;
iInterlaceValue1 = iInterlaceValue2 = 0;
for (y = 0; y < height; y++, psrc1 += y_line, pdst1 += y_line) {
/* current line is 1 */
y0 = y1 = y2 = y3 = *psrc1;
if (y > 0)
y0 = *(psrc1 - y_line);
if (y < (height - 1))
y2 = *(psrc1 + y_line);
if (y < (height - 2))
y3 = *(psrc1 + 2 * y_line);
iInterlaceValue0 = iInterlaceValue1;
iInterlaceValue1 = iInterlaceValue2;
if (y < height - 1)
iInterlaceValue2 =
(ABS (y1 - y2) * ABS (y3 - y2) - ((iEdgeDetect * (y1 - y3) * (y1 -
y3)) >> 12)) * 10;
else
iInterlaceValue2 = 0;
if ((iInterlaceValue0 + 2 * iInterlaceValue1 + iInterlaceValue2 >
iThreshold) && (y > 0)) {
if (bShowNoninterlacedAreaOnly) {
*pdst1 = fill_value; /* blank the point and so the interlac area */
} else {
if (bDeinterlace) {
if (bBlend) {
*pdst1 = (unsigned char) ((y0 + 2 * y1 + y2) >> 2);
} else {
/* this method seems to work better than blending if the */
/* quality is pretty bad and the half pics don't fit together */
if ((y % 2) == 1) { /* if odd simply copy the value */
*pdst1 = *psrc1;
} else { /* if even interpolate the line (upper + lower)/2 */
*pdst1 = (unsigned char) ((y0 + y2) >> 1);
}
}
} else {
*pdst1 = *psrc1;
}
}
} else {
/* so we went below the treshold and therefore we don't have to */
/* change anything */
if (bShowDeinterlacedAreaOnly) {
/* this is for testing to see how we should tune the treshhold */
/* and shows as the things that haven't change because the */
/* threshold was to low?? (or shows that everything is ok :-) */
*pdst1 = fill_value; /* blank the point and so the non-interlac area */
} else {
*pdst1 = *psrc1;
}
}
}
}
}
return GST_FLOW_OK;
}
static void
gst_deinterlace_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstDeinterlace *filter;
filter = GST_DEINTERLACE (object);
GST_OBJECT_LOCK (filter);
switch (prop_id) {
case ARG_DEINTERLACE:
filter->deinterlace = g_value_get_boolean (value);
break;
case ARG_DI_ONLY:
filter->show_deinterlaced_area_only = g_value_get_boolean (value);
break;
case ARG_NI_ONLY:
filter->show_noninterlaced_area_only = g_value_get_boolean (value);
break;
case ARG_BLEND:
filter->blend = g_value_get_boolean (value);
break;
case ARG_THRESHOLD:
filter->threshold = g_value_get_int (value);
break;
case ARG_EDGE_DETECT:
filter->edge_detect = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (filter);
}
static void
gst_deinterlace_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstDeinterlace *filter;
filter = GST_DEINTERLACE (object);
GST_OBJECT_LOCK (filter);
switch (prop_id) {
case ARG_DEINTERLACE:
g_value_set_boolean (value, filter->deinterlace);
break;
case ARG_DI_ONLY:
g_value_set_boolean (value, filter->show_deinterlaced_area_only);
break;
case ARG_NI_ONLY:
g_value_set_boolean (value, filter->show_noninterlaced_area_only);
break;
case ARG_BLEND:
g_value_set_boolean (value, filter->blend);
break;
case ARG_THRESHOLD:
g_value_set_int (value, filter->threshold);
break;
case ARG_EDGE_DETECT:
g_value_set_int (value, filter->edge_detect);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (filter);
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (deinterlace_debug, "deinterlace", 0,
"deinterlace element");
if (!gst_element_register (plugin, "deinterlace", GST_RANK_NONE,
gst_deinterlace_get_type ()))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstinterlace",
"Deinterlace video", plugin_init, PACKAGE_VERSION, "LGPL", GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN);
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