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/* GStreamer
* Copyright (C) 1999 Erik Walthinsen <omega@cse.ogi.edu>
* Copyright (C) 2007 Wim Taymans <wim.taymans@collabora.co.uk>
* Copyright (C) 2007 Edward Hervey <edward.hervey@collabora.co.uk>
* Copyright (C) 2007 Jan Schmidt <thaytan@noraisin.net>
* Copyright (C) 2010 Sebastian Dröge <sebastian.droege@collabora.co.uk>
*
* 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-chromahold
*
* The chromahold element will remove all color information for
* all colors except a single one and converts them to grayscale.
*
* Sample pipeline:
* |[
* gst-launch-1.0 videotestsrc pattern=smpte75 ! \
* chromahold target-r=0 target-g=0 target-b=255 ! \
* videoconvert ! autovideosink \
* ]| This pipeline only keeps the red color.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstchromahold.h"
#include <stdlib.h>
#include <string.h>
#include <math.h>
GST_DEBUG_CATEGORY_STATIC (gst_chroma_hold_debug);
#define GST_CAT_DEFAULT gst_chroma_hold_debug
#define DEFAULT_TARGET_R 255
#define DEFAULT_TARGET_G 0
#define DEFAULT_TARGET_B 0
#define DEFAULT_TOLERANCE 30
enum
{
PROP_0,
PROP_TARGET_R,
PROP_TARGET_G,
PROP_TARGET_B,
PROP_TOLERANCE
};
static GstStaticPadTemplate gst_chroma_hold_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE
("{ ARGB, BGRA, ABGR, RGBA, xRGB, BGRx, xBGR, RGBx}"))
);
static GstStaticPadTemplate gst_chroma_hold_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE
("{ ARGB, BGRA, ABGR, RGBA, xRGB, BGRx, xBGR, RGBx}"))
);
#define GST_CHROMA_HOLD_LOCK(self) G_STMT_START { \
GST_LOG_OBJECT (self, "Locking chromahold from thread %p", g_thread_self ()); \
g_mutex_lock (&self->lock); \
GST_LOG_OBJECT (self, "Locked chromahold from thread %p", g_thread_self ()); \
} G_STMT_END
#define GST_CHROMA_HOLD_UNLOCK(self) G_STMT_START { \
GST_LOG_OBJECT (self, "Unlocking chromahold from thread %p", \
g_thread_self ()); \
g_mutex_unlock (&self->lock); \
} G_STMT_END
static gboolean gst_chroma_hold_start (GstBaseTransform * trans);
static gboolean gst_chroma_hold_set_info (GstVideoFilter * vfilter,
GstCaps * incaps, GstVideoInfo * in_info, GstCaps * outcaps,
GstVideoInfo * out_info);
static GstFlowReturn gst_chroma_hold_transform_frame_ip (GstVideoFilter *
vfilter, GstVideoFrame * frame);
static void gst_chroma_hold_before_transform (GstBaseTransform * btrans,
GstBuffer * buf);
static void gst_chroma_hold_init_params (GstChromaHold * self);
static gboolean gst_chroma_hold_set_process_function (GstChromaHold * self);
static void gst_chroma_hold_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_chroma_hold_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_chroma_hold_finalize (GObject * object);
#define gst_chroma_hold_parent_class parent_class
G_DEFINE_TYPE (GstChromaHold, gst_chroma_hold, GST_TYPE_VIDEO_FILTER);
static void
gst_chroma_hold_class_init (GstChromaHoldClass * klass)
{
GObjectClass *gobject_class = (GObjectClass *) klass;
GstElementClass *gstelement_class = (GstElementClass *) klass;
GstBaseTransformClass *btrans_class = (GstBaseTransformClass *) klass;
GstVideoFilterClass *vfilter_class = (GstVideoFilterClass *) klass;
gobject_class->set_property = gst_chroma_hold_set_property;
gobject_class->get_property = gst_chroma_hold_get_property;
gobject_class->finalize = gst_chroma_hold_finalize;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_R,
g_param_spec_uint ("target-r", "Target Red", "The Red target", 0, 255,
DEFAULT_TARGET_R,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_G,
g_param_spec_uint ("target-g", "Target Green", "The Green target", 0, 255,
DEFAULT_TARGET_G,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_B,
g_param_spec_uint ("target-b", "Target Blue", "The Blue target", 0, 255,
DEFAULT_TARGET_B,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TOLERANCE,
g_param_spec_uint ("tolerance", "Tolerance",
"Tolerance for the target color", 0, 180, DEFAULT_TOLERANCE,
G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
btrans_class->start = GST_DEBUG_FUNCPTR (gst_chroma_hold_start);
btrans_class->before_transform =
GST_DEBUG_FUNCPTR (gst_chroma_hold_before_transform);
vfilter_class->transform_frame_ip =
GST_DEBUG_FUNCPTR (gst_chroma_hold_transform_frame_ip);
vfilter_class->set_info = GST_DEBUG_FUNCPTR (gst_chroma_hold_set_info);
gst_element_class_set_static_metadata (gstelement_class, "Chroma hold filter",
"Filter/Effect/Video",
"Removes all color information except for one color",
"Sebastian Dröge <sebastian.droege@collabora.co.uk>");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_chroma_hold_sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&gst_chroma_hold_src_template));
GST_DEBUG_CATEGORY_INIT (gst_chroma_hold_debug, "chromahold", 0,
"chromahold - Removes all color information except for one color");
}
static void
gst_chroma_hold_init (GstChromaHold * self)
{
self->target_r = DEFAULT_TARGET_R;
self->target_g = DEFAULT_TARGET_G;
self->target_b = DEFAULT_TARGET_B;
self->tolerance = DEFAULT_TOLERANCE;
g_mutex_init (&self->lock);
}
static void
gst_chroma_hold_finalize (GObject * object)
{
GstChromaHold *self = GST_CHROMA_HOLD (object);
g_mutex_clear (&self->lock);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_chroma_hold_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstChromaHold *self = GST_CHROMA_HOLD (object);
GST_CHROMA_HOLD_LOCK (self);
switch (prop_id) {
case PROP_TARGET_R:
self->target_r = g_value_get_uint (value);
gst_chroma_hold_init_params (self);
break;
case PROP_TARGET_G:
self->target_g = g_value_get_uint (value);
gst_chroma_hold_init_params (self);
break;
case PROP_TARGET_B:
self->target_b = g_value_get_uint (value);
gst_chroma_hold_init_params (self);
break;
case PROP_TOLERANCE:
self->tolerance = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_CHROMA_HOLD_UNLOCK (self);
}
static void
gst_chroma_hold_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstChromaHold *self = GST_CHROMA_HOLD (object);
switch (prop_id) {
case PROP_TARGET_R:
g_value_set_uint (value, self->target_r);
break;
case PROP_TARGET_G:
g_value_set_uint (value, self->target_g);
break;
case PROP_TARGET_B:
g_value_set_uint (value, self->target_b);
break;
case PROP_TOLERANCE:
g_value_set_uint (value, self->tolerance);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_chroma_hold_set_info (GstVideoFilter * vfilter, GstCaps * incaps,
GstVideoInfo * in_info, GstCaps * outcaps, GstVideoInfo * out_info)
{
GstChromaHold *self = GST_CHROMA_HOLD (vfilter);
GST_CHROMA_HOLD_LOCK (self);
GST_DEBUG_OBJECT (self,
"Setting caps %" GST_PTR_FORMAT " -> %" GST_PTR_FORMAT, incaps, outcaps);
self->format = GST_VIDEO_INFO_FORMAT (in_info);
self->width = GST_VIDEO_INFO_WIDTH (in_info);
self->height = GST_VIDEO_INFO_HEIGHT (in_info);
if (!gst_chroma_hold_set_process_function (self)) {
GST_WARNING_OBJECT (self, "No processing function for this caps");
GST_CHROMA_HOLD_UNLOCK (self);
return FALSE;
}
GST_CHROMA_HOLD_UNLOCK (self);
return TRUE;
}
static inline gint
rgb_to_hue (gint r, gint g, gint b)
{
gint m, M, C, C2, h;
m = MIN (MIN (r, g), b);
M = MAX (MAX (r, g), b);
C = M - m;
C2 = C >> 1;
if (C == 0) {
return G_MAXUINT;
} else if (M == r) {
h = ((256 * 60 * (g - b) + C2) / C);
} else if (M == g) {
h = ((256 * 60 * (b - r) + C2) / C) + 120 * 256;
} else {
/* if (M == b) */
h = ((256 * 60 * (r - g) + C2) / C) + 240 * 256;
}
h >>= 8;
if (h >= 360)
h -= 360;
else if (h < 0)
h += 360;
return h;
}
static inline gint
hue_dist (gint h1, gint h2)
{
gint d1, d2;
d1 = h1 - h2;
d2 = h2 - h1;
if (d1 < 0)
d1 += 360;
if (d2 < 0)
d2 += 360;
return MIN (d1, d2);
}
static void
gst_chroma_hold_process_xrgb (GstVideoFrame * frame, gint width,
gint height, GstChromaHold * self)
{
gint i, j;
gint r, g, b;
gint grey;
gint h1, h2;
gint tolerance = self->tolerance;
gint p[4];
gint diff;
gint row_wrap;
guint8 *dest;
dest = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
p[0] = GST_VIDEO_FRAME_COMP_POFFSET (frame, 3);
p[1] = GST_VIDEO_FRAME_COMP_POFFSET (frame, 0);
p[2] = GST_VIDEO_FRAME_COMP_POFFSET (frame, 1);
p[3] = GST_VIDEO_FRAME_COMP_POFFSET (frame, 2);
row_wrap = GST_VIDEO_FRAME_PLANE_STRIDE (frame, 0) - 4 * width;
h1 = self->hue;
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
r = dest[p[1]];
g = dest[p[2]];
b = dest[p[3]];
h2 = rgb_to_hue (r, g, b);
diff = hue_dist (h1, h2);
if (h1 == G_MAXUINT || diff > tolerance) {
grey = (13938 * r + 46869 * g + 4730 * b) >> 16;
grey = CLAMP (grey, 0, 255);
dest[p[1]] = grey;
dest[p[2]] = grey;
dest[p[3]] = grey;
}
dest += 4;
}
dest += row_wrap;
}
}
/* Protected with the chroma hold lock */
static void
gst_chroma_hold_init_params (GstChromaHold * self)
{
self->hue = rgb_to_hue (self->target_r, self->target_g, self->target_b);
}
/* Protected with the chroma hold lock */
static gboolean
gst_chroma_hold_set_process_function (GstChromaHold * self)
{
self->process = NULL;
switch (self->format) {
case GST_VIDEO_FORMAT_ARGB:
case GST_VIDEO_FORMAT_ABGR:
case GST_VIDEO_FORMAT_RGBA:
case GST_VIDEO_FORMAT_BGRA:
case GST_VIDEO_FORMAT_xRGB:
case GST_VIDEO_FORMAT_xBGR:
case GST_VIDEO_FORMAT_RGBx:
case GST_VIDEO_FORMAT_BGRx:
self->process = gst_chroma_hold_process_xrgb;
break;
default:
break;
}
return self->process != NULL;
}
static gboolean
gst_chroma_hold_start (GstBaseTransform * btrans)
{
GstChromaHold *self = GST_CHROMA_HOLD (btrans);
GST_CHROMA_HOLD_LOCK (self);
gst_chroma_hold_init_params (self);
GST_CHROMA_HOLD_UNLOCK (self);
return TRUE;
}
static void
gst_chroma_hold_before_transform (GstBaseTransform * btrans, GstBuffer * buf)
{
GstChromaHold *self = GST_CHROMA_HOLD (btrans);
GstClockTime timestamp;
timestamp = gst_segment_to_stream_time (&btrans->segment, GST_FORMAT_TIME,
GST_BUFFER_TIMESTAMP (buf));
GST_LOG ("Got stream time of %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));
if (GST_CLOCK_TIME_IS_VALID (timestamp))
gst_object_sync_values (GST_OBJECT (self), timestamp);
}
static GstFlowReturn
gst_chroma_hold_transform_frame_ip (GstVideoFilter * vfilter,
GstVideoFrame * frame)
{
GstChromaHold *self = GST_CHROMA_HOLD (vfilter);
GST_CHROMA_HOLD_LOCK (self);
if (G_UNLIKELY (!self->process)) {
GST_ERROR_OBJECT (self, "Not negotiated yet");
GST_CHROMA_HOLD_UNLOCK (self);
return GST_FLOW_NOT_NEGOTIATED;
}
self->process (frame, self->width, self->height, self);
GST_CHROMA_HOLD_UNLOCK (self);
return GST_FLOW_OK;
}