#include <gst/video/video.h>
#include <string.h>
+#include <math.h>
#define GST_TYPE_ALPHA \
(gst_alpha_get_type())
ALPHA_METHOD_ADD,
ALPHA_METHOD_GREEN,
ALPHA_METHOD_BLUE,
- ALPHA_METHOD_BLACK,
+ ALPHA_METHOD_CUSTOM,
}
GstAlphaMethod;
-#define DEFAULT_METHOD ALPHA_METHOD_ADD
-#define DEFAULT_ALPHA 1.0
-#define DEFAULT_TARGET_CR 116
-#define DEFAULT_TARGET_CB 116
+#define ROUND_UP_4(x) (((x) + 3) & ~3)
+#define ROUND_UP_2(x) (((x) + 1) & ~1)
struct _GstAlpha
{
gdouble alpha;
- guint target_cr, target_cb;
+ guint target_r;
+ guint target_g;
+ guint target_b;
GstAlphaMethod method;
+
+ gfloat angle;
+ gfloat noise_level;
+
+ gfloat y; /* chroma color */
+ gint8 cb, cr;
+ gint8 kg;
+ gfloat accept_angle_cos;
+ gfloat accept_angle_sin;
+ guint8 accept_angle_tg;
+ guint8 accept_angle_ctg;
+ guint8 one_over_kc;
+ guint8 kfgy_scale;
};
struct _GstAlphaClass
LAST_SIGNAL
};
+#define DEFAULT_METHOD ALPHA_METHOD_ADD
+#define DEFAULT_ALPHA 1.0
+#define DEFAULT_TARGET_R 0
+#define DEFAULT_TARGET_G 255
+#define DEFAULT_TARGET_B 0
+#define DEFAULT_ANGLE 20.0
+#define DEFAULT_NOISE_LEVEL 2.0
+
enum
{
ARG_0,
ARG_METHOD,
ARG_ALPHA,
- ARG_TARGET_CR,
- ARG_TARGET_CB,
+ ARG_TARGET_R,
+ ARG_TARGET_G,
+ ARG_TARGET_B,
+ ARG_ANGLE,
+ ARG_NOISE_LEVEL,
/* FILL ME */
};
static void gst_alpha_base_init (gpointer g_class);
static void gst_alpha_class_init (GstAlphaClass * klass);
static void gst_alpha_init (GstAlpha * alpha);
+static void gst_alpha_init_params (GstAlpha * alpha);
static void gst_alpha_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
{ALPHA_METHOD_ADD, "0", "Add alpha channel"},
{ALPHA_METHOD_GREEN, "1", "Chroma Key green"},
{ALPHA_METHOD_BLUE, "2", "Chroma Key blue"},
- {ALPHA_METHOD_BLACK, "3", "Chroma Key black"},
+ {ALPHA_METHOD_CUSTOM, "3", "Chroma Key on target_r/g/b"},
{0, NULL, NULL},
};
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ALPHA,
g_param_spec_double ("alpha", "Alpha", "The value for the alpha channel",
0.0, 1.0, DEFAULT_ALPHA, (GParamFlags) G_PARAM_READWRITE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TARGET_CR,
- g_param_spec_uint ("target_cr", "Target Red", "The Red Chroma target", 0,
- 255, 116, (GParamFlags) G_PARAM_READWRITE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TARGET_CB,
- g_param_spec_uint ("target_cb", "Target Blue", "The Blue Chroma target",
- 0, 255, 116, (GParamFlags) G_PARAM_READWRITE));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TARGET_R,
+ g_param_spec_uint ("target_r", "Target Red", "The Red target", 0,
+ 255, DEFAULT_TARGET_R, (GParamFlags) G_PARAM_READWRITE));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TARGET_G,
+ g_param_spec_uint ("target_g", "Target Green", "The Green target", 0,
+ 255, DEFAULT_TARGET_G, (GParamFlags) G_PARAM_READWRITE));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TARGET_B,
+ g_param_spec_uint ("target_b", "Target Blue", "The Blue target",
+ 0, 255, DEFAULT_TARGET_B, (GParamFlags) G_PARAM_READWRITE));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_ANGLE,
+ g_param_spec_float ("angle", "Angle", "Size of the colorcube to change",
+ 0.0, 90.0, DEFAULT_ANGLE, (GParamFlags) G_PARAM_READWRITE));
+ g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NOISE_LEVEL,
+ g_param_spec_float ("noise_level", "Noise Level", "Size of noise radius",
+ 0.0, 64.0, DEFAULT_NOISE_LEVEL, (GParamFlags) G_PARAM_READWRITE));
gobject_class->set_property = gst_alpha_set_property;
gobject_class->get_property = gst_alpha_get_property;
alpha->alpha = DEFAULT_ALPHA;
alpha->method = DEFAULT_METHOD;
- alpha->target_cr = DEFAULT_TARGET_CR;
- alpha->target_cb = DEFAULT_TARGET_CB;
+ alpha->target_r = DEFAULT_TARGET_R;
+ alpha->target_g = DEFAULT_TARGET_G;
+ alpha->target_b = DEFAULT_TARGET_B;
+ alpha->angle = DEFAULT_ANGLE;
+ alpha->noise_level = DEFAULT_NOISE_LEVEL;
GST_FLAG_SET (alpha, GST_ELEMENT_EVENT_AWARE);
}
switch (prop_id) {
case ARG_METHOD:
alpha->method = g_value_get_enum (value);
+ switch (alpha->method) {
+ case ALPHA_METHOD_GREEN:
+ alpha->target_r = 0;
+ alpha->target_g = 255;
+ alpha->target_b = 0;
+ break;
+ case ALPHA_METHOD_BLUE:
+ alpha->target_r = 0;
+ alpha->target_g = 0;
+ alpha->target_b = 255;
+ break;
+ default:
+ break;
+ }
+ gst_alpha_init_params (alpha);
break;
case ARG_ALPHA:
alpha->alpha = g_value_get_double (value);
break;
- case ARG_TARGET_CB:
- alpha->target_cb = g_value_get_uint (value);
+ case ARG_TARGET_R:
+ alpha->target_r = g_value_get_uint (value);
+ gst_alpha_init_params (alpha);
+ break;
+ case ARG_TARGET_G:
+ alpha->target_g = g_value_get_uint (value);
+ gst_alpha_init_params (alpha);
+ break;
+ case ARG_TARGET_B:
+ alpha->target_b = g_value_get_uint (value);
+ gst_alpha_init_params (alpha);
break;
- case ARG_TARGET_CR:
- alpha->target_cr = g_value_get_uint (value);
+ case ARG_ANGLE:
+ alpha->angle = g_value_get_float (value);
+ gst_alpha_init_params (alpha);
+ break;
+ case ARG_NOISE_LEVEL:
+ alpha->noise_level = g_value_get_float (value);
+ gst_alpha_init_params (alpha);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
case ARG_ALPHA:
g_value_set_double (value, alpha->alpha);
break;
- case ARG_TARGET_CR:
- g_value_set_uint (value, alpha->target_cr);
+ case ARG_TARGET_R:
+ g_value_set_uint (value, alpha->target_r);
+ break;
+ case ARG_TARGET_G:
+ g_value_set_uint (value, alpha->target_g);
+ break;
+ case ARG_TARGET_B:
+ g_value_set_uint (value, alpha->target_b);
break;
- case ARG_TARGET_CB:
- g_value_set_uint (value, alpha->target_cb);
+ case ARG_ANGLE:
+ g_value_set_float (value, alpha->angle);
+ break;
+ case ARG_NOISE_LEVEL:
+ g_value_set_float (value, alpha->noise_level);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
return GST_PAD_LINK_OK;
}
-/*
-static int yuv_colors_Y[] = { 16, 150, 29 };
-static int yuv_colors_U[] = { 128, 46, 255 };
-static int yuv_colors_V[] = { 128, 21, 107 };
-*/
-
#define ROUND_UP_4(x) (((x) + 3) & ~3)
static void
}
}
-#define ROUND_UP_4(x) (((x) + 3) & ~3)
-#define ROUND_UP_2(x) (((x) + 1) & ~1)
+/* based on http://www.cs.utah.edu/~michael/chroma/
+ */
static void
gst_alpha_chroma_key (gchar * src, gchar * dest, gint width, gint height,
- gboolean soft, gint target_u, gint target_v, gfloat edge_factor,
- gdouble alpha)
+ GstAlpha * alpha)
{
gint b_alpha;
- gint f_alpha = (gint) (alpha * 255);
guint8 *srcY1, *srcY2, *srcU, *srcV;
guint8 *dest1, *dest2;
gint i, j;
- gint x, z, u, v;
+ gint x, z, u, v, y11, y12, y21, y22;
gint w2, h2;
gint size, size2;
gint stride, stride2;
gint wrap, wrap2, wrap3;
+ gint tmp, tmp1;
+ gint x1, y1;
stride = ROUND_UP_4 (width);
size = stride * height;
for (i = 0; i < height / 2; i++) {
for (j = 0; j < width / 2; j++) {
- u = *srcU++;
- v = *srcV++;
-
- x = target_u - u;
- z = target_v - v;
-
- // only filter if in top left square
- if ((x > 0) && (z > 0)) {
- // only calculate lot of stuff if we'll use soft edges
- if (soft) {
- gint ds = (x > z) ? z : x;
-
- gfloat df = (gfloat) (ds) / edge_factor;
-
- if (df > 1.0)
- df = 1.0;
-
- // suppress foreground
- if (x > z) {
- u += z;
- v += z;
- } else {
- u += x;
- v += x;
- }
- b_alpha = (int) (f_alpha * (1.0 - df));
- } else {
- // kill color and alpha
+ y11 = *srcY1++;
+ y12 = *srcY1++;
+ y21 = *srcY2++;
+ y22 = *srcY2++;
+ u = *srcU++ - 128;
+ v = *srcV++ - 128;
+
+ /* Convert foreground to XZ coords where X direction is defined by
+ the key color */
+ tmp = ((short) u * alpha->cb + (short) v * alpha->cr) >> 7;
+ x = CLAMP (tmp, -128, 127);
+ tmp = ((short) v * alpha->cb - (short) u * alpha->cr) >> 7;
+ z = CLAMP (tmp, -128, 127);
+
+ /* WARNING: accept angle should never be set greater than "somewhat less
+ than 90 degrees" to avoid dealing with negative/infinite tg. In reality,
+ 80 degrees should be enough if foreground is reasonable. If this seems
+ to be a problem, go to alternative ways of checking point position
+ (scalar product or line equations). This angle should not be too small
+ either to avoid infinite ctg (used to suppress foreground without use of
+ division) */
+
+ tmp = ((short) (x) * alpha->accept_angle_tg) >> 4;
+ tmp = MIN (tmp, 127);
+
+ if (abs (z) > tmp) {
+ /* keep foreground Kfg = 0 */
+ b_alpha = 255;
+ } else {
+ /* Compute Kfg (implicitly) and Kbg, suppress foreground in XZ coord
+ according to Kfg */
+ tmp = ((short) (z) * alpha->accept_angle_ctg) >> 4;
+ tmp = CLAMP (tmp, -128, 127);
+ x1 = abs (tmp);
+ y1 = z;
+
+ tmp1 = x - x1;
+ tmp1 = MAX (tmp1, 0);
+ b_alpha = (((unsigned char) (tmp1) *
+ (unsigned short) (alpha->one_over_kc)) / 2);
+ b_alpha = 255 - CLAMP (b_alpha, 0, 255);
+
+ tmp = ((unsigned short) (tmp1) * alpha->kfgy_scale) >> 4;
+ tmp1 = MIN (tmp, 255);
+
+ tmp = y11 - tmp1;
+ y11 = MAX (tmp, 0);
+ tmp = y12 - tmp1;
+ y12 = MAX (tmp, 0);
+ tmp = y21 - tmp1;
+ y21 = MAX (tmp, 0);
+ tmp = y22 - tmp1;
+ y22 = MAX (tmp, 0);
+
+ /* Convert suppressed foreground back to CbCr */
+ tmp = ((char) (x1) * (short) (alpha->cb) -
+ (char) (y1) * (short) (alpha->cr)) >> 7;
+ u = CLAMP (tmp, -128, 127);
+
+ tmp = ((char) (x1) * (short) (alpha->cr) +
+ (char) (y1) * (short) (alpha->cb)) >> 7;
+ v = CLAMP (tmp, -128, 127);
+
+ /* Deal with noise. For now, a circle around the key color with
+ radius of noise_level treated as exact key color. Introduces
+ sharp transitions.
+ */
+ tmp = z * (short) (z) + (x - alpha->kg) * (short) (x - alpha->kg);
+ tmp = MIN (tmp, 0xffff);
+
+ if (tmp < alpha->noise_level * alpha->noise_level) {
+ /* Uncomment this if you want total suppression within the noise circle */
b_alpha = 0;
}
- } else {
- // do nothing;
- b_alpha = f_alpha;
}
+ u += 128;
+ v += 128;
+
*dest1++ = b_alpha;
- *dest1++ = *srcY1++;
+ *dest1++ = y11;
*dest1++ = u;
*dest1++ = v;
*dest1++ = b_alpha;
- *dest1++ = *srcY1++;
+ *dest1++ = y12;
*dest1++ = u;
*dest1++ = v;
*dest2++ = b_alpha;
- *dest2++ = *srcY2++;
+ *dest2++ = y21;
*dest2++ = u;
*dest2++ = v;
*dest2++ = b_alpha;
- *dest2++ = *srcY2++;
+ *dest2++ = y22;
*dest2++ = u;
*dest2++ = v;
}
}
}
+static void
+gst_alpha_init_params (GstAlpha * alpha)
+{
+ float kgl;
+ float tmp;
+ float tmp1, tmp2;
+
+ alpha->y =
+ 0.257 * alpha->target_r + 0.504 * alpha->target_g +
+ 0.098 * alpha->target_b;
+ tmp1 =
+ -0.148 * alpha->target_r - 0.291 * alpha->target_g +
+ 0.439 * alpha->target_b;
+ tmp2 =
+ 0.439 * alpha->target_r - 0.368 * alpha->target_g -
+ 0.071 * alpha->target_b;
+ kgl = sqrt (tmp1 * tmp1 + tmp2 * tmp2);
+ alpha->cb = 127 * (tmp1 / kgl);
+ alpha->cr = 127 * (tmp2 / kgl);
+
+ alpha->accept_angle_cos = cos (M_PI * alpha->angle / 180);
+ alpha->accept_angle_sin = sin (M_PI * alpha->angle / 180);
+ tmp = 15 * tan (M_PI * alpha->angle / 180);
+ tmp = MIN (tmp, 255);
+ alpha->accept_angle_tg = tmp;
+ tmp = 15 / tan (M_PI * alpha->angle / 180);
+ tmp = MIN (tmp, 255);
+ alpha->accept_angle_ctg = tmp;
+ tmp = 1 / (kgl);
+ alpha->one_over_kc = 255 * 2 * tmp - 255;
+ tmp = 15 * (float) (alpha->y) / kgl;
+ tmp = MIN (tmp, 255);
+ alpha->kfgy_scale = tmp;
+ alpha->kg = MIN (kgl, 127);
+}
+
static void
gst_alpha_chain (GstPad * pad, GstData * _data)
{
break;
case ALPHA_METHOD_GREEN:
gst_alpha_chroma_key (GST_BUFFER_DATA (buffer),
- GST_BUFFER_DATA (outbuf),
- new_width, new_height,
- FALSE, alpha->target_cr, alpha->target_cb, 1.0, alpha->alpha);
+ GST_BUFFER_DATA (outbuf), new_width, new_height, alpha);
break;
case ALPHA_METHOD_BLUE:
gst_alpha_chroma_key (GST_BUFFER_DATA (buffer),
- GST_BUFFER_DATA (outbuf),
- new_width, new_height, TRUE, 100, 100, 1.0, alpha->alpha);
+ GST_BUFFER_DATA (outbuf), new_width, new_height, alpha);
break;
- case ALPHA_METHOD_BLACK:
+ case ALPHA_METHOD_CUSTOM:
gst_alpha_chroma_key (GST_BUFFER_DATA (buffer),
- GST_BUFFER_DATA (outbuf),
- new_width, new_height, TRUE, 129, 129, 1.0, alpha->alpha);
+ GST_BUFFER_DATA (outbuf), new_width, new_height, alpha);
break;
default:
break;
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
+ gst_alpha_init_params (alpha);
break;
case GST_STATE_PAUSED_TO_PLAYING:
break;
projects / platform / upstream / gst-plugins-good.git / commitdiff