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/* GStreamer
* Copyright (C) 2013 Rdio, Inc. <ingestions@rdio.com>
*
* 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 Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-gstcombdetect
* @title: gstcombdetect
*
* The combdetect element detects if combing artifacts are present in
* a raw video stream, and if so, marks them with a zebra stripe
* pattern.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v filesrc location=file.mov ! decodebin ! combdetect !
* xvimagesink
* ]|
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/video/gstvideofilter.h>
#include "gstcombdetect.h"
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_comb_detect_debug_category);
#define GST_CAT_DEFAULT gst_comb_detect_debug_category
/* prototypes */
static GstCaps *gst_comb_detect_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static gboolean gst_comb_detect_set_info (GstVideoFilter * filter,
GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
GstVideoInfo * out_info);
static GstFlowReturn gst_comb_detect_transform_frame (GstVideoFilter * filter,
GstVideoFrame * inframe, GstVideoFrame * outframe);
enum
{
PROP_0
};
/* pad templates */
/* Yeah, the max width is hard-coded 2048. */
#define MAX_WIDTH 2048
#define VIDEO_CAPS \
"video/x-raw, " \
"format = (string) { I420, Y444, Y42B }, " \
"width = [1, 2048], " \
"height = " GST_VIDEO_SIZE_RANGE ", " \
"framerate = " GST_VIDEO_FPS_RANGE
static GstStaticPadTemplate gst_comb_detect_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (VIDEO_CAPS)
);
static GstStaticPadTemplate gst_comb_detect_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (VIDEO_CAPS)
);
/* class initialization */
G_DEFINE_TYPE_WITH_CODE (GstCombDetect, gst_comb_detect, GST_TYPE_VIDEO_FILTER,
GST_DEBUG_CATEGORY_INIT (gst_comb_detect_debug_category, "combdetect", 0,
"debug category for combdetect element"));
static void
gst_comb_detect_class_init (GstCombDetectClass * klass)
{
GstBaseTransformClass *base_transform_class =
GST_BASE_TRANSFORM_CLASS (klass);
GstVideoFilterClass *video_filter_class = GST_VIDEO_FILTER_CLASS (klass);
/* Setting up pads and setting metadata should be moved to
base_class_init if you intend to subclass this class. */
gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
&gst_comb_detect_sink_template);
gst_element_class_add_static_pad_template (GST_ELEMENT_CLASS (klass),
&gst_comb_detect_src_template);
gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
"Comb Detect", "Video/Filter", "Detect combing artifacts in video stream",
"David Schleef <ds@schleef.org>");
base_transform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_comb_detect_transform_caps);
video_filter_class->set_info = GST_DEBUG_FUNCPTR (gst_comb_detect_set_info);
video_filter_class->transform_frame =
GST_DEBUG_FUNCPTR (gst_comb_detect_transform_frame);
}
static void
gst_comb_detect_init (GstCombDetect * combdetect)
{
}
static GstCaps *
gst_comb_detect_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter)
{
GstCaps *othercaps;
int i;
othercaps = gst_caps_copy (caps);
if (direction == GST_PAD_SRC) {
GValue value = G_VALUE_INIT;
GValue v = G_VALUE_INIT;
g_value_init (&value, GST_TYPE_LIST);
g_value_init (&v, G_TYPE_STRING);
g_value_set_string (&v, "interleaved");
gst_value_list_append_value (&value, &v);
g_value_set_string (&v, "mixed");
gst_value_list_append_value (&value, &v);
g_value_set_string (&v, "progressive");
gst_value_list_append_value (&value, &v);
for (i = 0; i < gst_caps_get_size (othercaps); i++) {
GstStructure *structure = gst_caps_get_structure (othercaps, i);
gst_structure_set_value (structure, "interlace-mode", &value);
}
g_value_unset (&value);
g_value_unset (&v);
} else {
for (i = 0; i < gst_caps_get_size (othercaps); i++) {
GstStructure *structure = gst_caps_get_structure (othercaps, i);
gst_structure_set (structure, "interlace-mode", G_TYPE_STRING,
"progressive", NULL);
}
}
if (filter) {
GstCaps *intersect;
intersect = gst_caps_intersect (othercaps, filter);
gst_caps_unref (othercaps);
othercaps = intersect;
}
return othercaps;
}
static gboolean
gst_comb_detect_set_info (GstVideoFilter * filter,
GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
GstVideoInfo * out_info)
{
GstCombDetect *combdetect = GST_COMB_DETECT (filter);
memcpy (&combdetect->vinfo, in_info, sizeof (GstVideoInfo));
return TRUE;
}
static GstFlowReturn
gst_comb_detect_transform_frame (GstVideoFilter * filter,
GstVideoFrame * inframe, GstVideoFrame * outframe)
{
static int z;
int k;
int height;
int width;
#define GET_LINE(frame,comp,line) (((unsigned char *)(frame)->data[k]) + \
(line) * GST_VIDEO_FRAME_COMP_STRIDE((frame), (comp)))
z++;
for (k = 1; k < 3; k++) {
int i;
height = GST_VIDEO_FRAME_COMP_HEIGHT (outframe, k);
width = GST_VIDEO_FRAME_COMP_WIDTH (outframe, k);
for (i = 0; i < height; i++) {
memcpy (GET_LINE (outframe, k, i), GET_LINE (inframe, k, i), width);
}
}
{
int j;
int thisline[MAX_WIDTH];
int score = 0;
height = GST_VIDEO_FRAME_COMP_HEIGHT (outframe, 0);
width = GST_VIDEO_FRAME_COMP_WIDTH (outframe, 0);
memset (thisline, 0, sizeof (thisline));
k = 0;
for (j = 0; j < height; j++) {
int i;
if (j < 2 || j >= height - 2) {
guint8 *dest = GET_LINE (outframe, 0, j);
guint8 *src = GET_LINE (inframe, 0, j);
for (i = 0; i < width; i++) {
dest[i] = src[i] / 2;
}
} else {
guint8 *dest = GET_LINE (outframe, 0, j);
guint8 *src1 = GET_LINE (inframe, 0, j - 1);
guint8 *src2 = GET_LINE (inframe, 0, j);
guint8 *src3 = GET_LINE (inframe, 0, j + 1);
for (i = 0; i < width; i++) {
if (src2[i] < MIN (src1[i], src3[i]) - 5 ||
src2[i] > MAX (src1[i], src3[i]) + 5) {
if (i > 0) {
thisline[i] += thisline[i - 1];
}
thisline[i]++;
if (thisline[i] > 1000)
thisline[i] = 1000;
} else {
thisline[i] = 0;
}
if (thisline[i] > 100) {
dest[i] = ((i + j + z) & 0x4) ? 235 : 16;
score++;
} else {
dest[i] = src2[i];
}
}
}
}
if (score > 10)
GST_DEBUG ("score %d", score);
}
return GST_FLOW_OK;
}