gstalpha.c 47 KB
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/* GStreamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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 * 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>
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 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
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#include "gstalpha.h"
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#ifndef M_PI
#define M_PI  3.14159265358979323846
#endif

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/* Generated by -bad/ext/cog/generate_tables */
static const int cog_ycbcr_to_rgb_matrix_8bit_hdtv[] = {
  298, 0, 459, -63514,
  298, -55, -136, 19681,
  298, 541, 0, -73988,
};

static const int cog_ycbcr_to_rgb_matrix_8bit_sdtv[] = {
  298, 0, 409, -57068,
  298, -100, -208, 34707,
  298, 516, 0, -70870,
};

static const gint cog_rgb_to_ycbcr_matrix_8bit_hdtv[] = {
  47, 157, 16, 4096,
  -26, -87, 112, 32768,
  112, -102, -10, 32768,
};

static const gint cog_rgb_to_ycbcr_matrix_8bit_sdtv[] = {
  66, 129, 25, 4096,
  -38, -74, 112, 32768,
  112, -94, -18, 32768,
};

static const gint cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit[] = {
  256, -30, -53, 10600,
  0, 261, 29, -4367,
  0, 19, 262, -3289,
};

static const gint cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit[] = {
  256, 25, 49, -9536,
  0, 253, -28, 3958,
  0, -19, 252, 2918,
};

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/* Alpha signals and args */
enum
{
  /* FILL ME */
  LAST_SIGNAL
};

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#define DEFAULT_METHOD ALPHA_METHOD_SET
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#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
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#define DEFAULT_BLACK_SENSITIVITY 100
#define DEFAULT_WHITE_SENSITIVITY 100
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enum
{
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  PROP_0,
  PROP_METHOD,
  PROP_ALPHA,
  PROP_TARGET_R,
  PROP_TARGET_G,
  PROP_TARGET_B,
  PROP_ANGLE,
  PROP_NOISE_LEVEL,
  PROP_BLACK_SENSITIVITY,
  PROP_WHITE_SENSITIVITY,
  PROP_LAST
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};

static GstStaticPadTemplate gst_alpha_src_template =
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    GST_STATIC_PAD_TEMPLATE ("src",
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    GST_PAD_SRC,
    GST_PAD_ALWAYS,
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    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";"
        GST_VIDEO_CAPS_ARGB ";" GST_VIDEO_CAPS_BGRA ";"
        GST_VIDEO_CAPS_ABGR ";" GST_VIDEO_CAPS_RGBA)
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    );

static GstStaticPadTemplate gst_alpha_sink_template =
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    GST_STATIC_PAD_TEMPLATE ("sink",
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    GST_PAD_SINK,
    GST_PAD_ALWAYS,
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    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";" GST_VIDEO_CAPS_YUV ("I420")
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    )
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    );

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static gboolean gst_alpha_start (GstBaseTransform * trans);
static gboolean gst_alpha_get_unit_size (GstBaseTransform * btrans,
    GstCaps * caps, guint * size);
static GstCaps *gst_alpha_transform_caps (GstBaseTransform * btrans,
    GstPadDirection direction, GstCaps * caps);
static gboolean gst_alpha_set_caps (GstBaseTransform * btrans,
    GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_alpha_transform (GstBaseTransform * btrans,
    GstBuffer * in, GstBuffer * out);
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static void gst_alpha_init_params (GstAlpha * alpha);
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static gboolean gst_alpha_set_process_function (GstAlpha * alpha);
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static void gst_alpha_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec);
static void gst_alpha_get_property (GObject * object, guint prop_id,
    GValue * value, GParamSpec * pspec);

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GST_BOILERPLATE (GstAlpha, gst_alpha, GstVideoFilter, GST_TYPE_VIDEO_FILTER);
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#define GST_TYPE_ALPHA_METHOD (gst_alpha_method_get_type())
static GType
gst_alpha_method_get_type (void)
{
  static GType alpha_method_type = 0;
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  static const GEnumValue alpha_method[] = {
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    {ALPHA_METHOD_SET, "Set/adjust alpha channel", "set"},
    {ALPHA_METHOD_GREEN, "Chroma Key green", "green"},
    {ALPHA_METHOD_BLUE, "Chroma Key blue", "blue"},
    {ALPHA_METHOD_CUSTOM, "Chroma Key on target_r/g/b", "custom"},
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    {0, NULL, NULL},
  };

  if (!alpha_method_type) {
    alpha_method_type = g_enum_register_static ("GstAlphaMethod", alpha_method);
  }
  return alpha_method_type;
}

static void
gst_alpha_base_init (gpointer g_class)
{
  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

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  gst_element_class_set_details_simple (element_class, "Alpha filter",
      "Filter/Effect/Video",
      "Adds an alpha channel to video - uniform or via chroma-keying",
      "Wim Taymans <wim@fluendo.com>\n"
      "Edward Hervey <edward.hervey@collabora.co.uk>\n"
      "Jan Schmidt <thaytan@noraisin.net>");
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  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_alpha_sink_template));
  gst_element_class_add_pad_template (element_class,
      gst_static_pad_template_get (&gst_alpha_src_template));
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  GST_DEBUG_CATEGORY_INIT (gst_alpha_debug, "alpha", 0,
      "alpha - Element for adding alpha channel to streams");
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}
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static void
gst_alpha_class_init (GstAlphaClass * klass)
{
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  GObjectClass *gobject_class = (GObjectClass *) klass;
  GstBaseTransformClass *btrans_class = (GstBaseTransformClass *) klass;
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  gobject_class->set_property = gst_alpha_set_property;
  gobject_class->get_property = gst_alpha_get_property;

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  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_METHOD,
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      g_param_spec_enum ("method", "Method",
          "How the alpha channels should be created", GST_TYPE_ALPHA_METHOD,
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          DEFAULT_METHOD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ALPHA,
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      g_param_spec_double ("alpha", "Alpha", "The value for the alpha channel",
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          0.0, 1.0, DEFAULT_ALPHA,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_R,
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      g_param_spec_uint ("target-r", "Target Red", "The Red target", 0, 255,
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          DEFAULT_TARGET_R,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_G,
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      g_param_spec_uint ("target-g", "Target Green", "The Green target", 0, 255,
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          DEFAULT_TARGET_G,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_B,
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      g_param_spec_uint ("target-b", "Target Blue", "The Blue target", 0, 255,
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          DEFAULT_TARGET_B,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ANGLE,
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      g_param_spec_float ("angle", "Angle", "Size of the colorcube to change",
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          0.0, 90.0, DEFAULT_ANGLE,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_NOISE_LEVEL,
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      g_param_spec_float ("noise-level", "Noise Level", "Size of noise radius",
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          0.0, 64.0, DEFAULT_NOISE_LEVEL,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass),
      PROP_BLACK_SENSITIVITY, g_param_spec_uint ("black-sensitivity",
          "Black Sensitivity", "Sensitivity to dark colors", 0, 128,
          DEFAULT_BLACK_SENSITIVITY,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  g_object_class_install_property (G_OBJECT_CLASS (klass),
      PROP_WHITE_SENSITIVITY, g_param_spec_uint ("white-sensitivity",
          "Sensitivity", "Sensitivity to bright colors", 0, 128,
          DEFAULT_WHITE_SENSITIVITY,
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          G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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  btrans_class->start = GST_DEBUG_FUNCPTR (gst_alpha_start);
  btrans_class->transform = GST_DEBUG_FUNCPTR (gst_alpha_transform);
  btrans_class->get_unit_size = GST_DEBUG_FUNCPTR (gst_alpha_get_unit_size);
  btrans_class->transform_caps = GST_DEBUG_FUNCPTR (gst_alpha_transform_caps);
  btrans_class->set_caps = GST_DEBUG_FUNCPTR (gst_alpha_set_caps);
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}

static void
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gst_alpha_init (GstAlpha * alpha, GstAlphaClass * klass)
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{
  alpha->alpha = DEFAULT_ALPHA;
  alpha->method = DEFAULT_METHOD;
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  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;
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  alpha->black_sensitivity = DEFAULT_BLACK_SENSITIVITY;
  alpha->white_sensitivity = DEFAULT_WHITE_SENSITIVITY;
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}

/* do we need this function? */
static void
gst_alpha_set_property (GObject * object, guint prop_id,
    const GValue * value, GParamSpec * pspec)
{
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  GstAlpha *alpha = GST_ALPHA (object);
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  GST_OBJECT_LOCK (alpha);
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  switch (prop_id) {
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    case PROP_METHOD:
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      alpha->method = g_value_get_enum (value);
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      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;
      }
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      gst_alpha_set_process_function (alpha);
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      gst_alpha_init_params (alpha);
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      break;
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    case PROP_ALPHA:
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      alpha->alpha = g_value_get_double (value);
      break;
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    case PROP_TARGET_R:
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      alpha->target_r = g_value_get_uint (value);
      gst_alpha_init_params (alpha);
      break;
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    case PROP_TARGET_G:
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      alpha->target_g = g_value_get_uint (value);
      gst_alpha_init_params (alpha);
      break;
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    case PROP_TARGET_B:
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      alpha->target_b = g_value_get_uint (value);
      gst_alpha_init_params (alpha);
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      break;
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    case PROP_ANGLE:
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      alpha->angle = g_value_get_float (value);
      gst_alpha_init_params (alpha);
      break;
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    case PROP_NOISE_LEVEL:
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      alpha->noise_level = g_value_get_float (value);
      gst_alpha_init_params (alpha);
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      break;
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    case PROP_BLACK_SENSITIVITY:
      alpha->black_sensitivity = g_value_get_uint (value);
      break;
    case PROP_WHITE_SENSITIVITY:
      alpha->white_sensitivity = g_value_get_uint (value);
      break;
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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
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  GST_OBJECT_UNLOCK (alpha);
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}
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static void
gst_alpha_get_property (GObject * object, guint prop_id, GValue * value,
    GParamSpec * pspec)
{
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  GstAlpha *alpha = GST_ALPHA (object);
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  switch (prop_id) {
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    case PROP_METHOD:
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      g_value_set_enum (value, alpha->method);
      break;
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    case PROP_ALPHA:
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      g_value_set_double (value, alpha->alpha);
      break;
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    case PROP_TARGET_R:
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      g_value_set_uint (value, alpha->target_r);
      break;
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    case PROP_TARGET_G:
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      g_value_set_uint (value, alpha->target_g);
      break;
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    case PROP_TARGET_B:
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      g_value_set_uint (value, alpha->target_b);
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      break;
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    case PROP_ANGLE:
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      g_value_set_float (value, alpha->angle);
      break;
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    case PROP_NOISE_LEVEL:
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      g_value_set_float (value, alpha->noise_level);
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      break;
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    case PROP_BLACK_SENSITIVITY:
      g_value_set_uint (value, alpha->black_sensitivity);
      break;
    case PROP_WHITE_SENSITIVITY:
      g_value_set_uint (value, alpha->white_sensitivity);
      break;
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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
}

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static gboolean
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gst_alpha_get_unit_size (GstBaseTransform * btrans,
    GstCaps * caps, guint * size)
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{
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  GstVideoFormat format;
  gint width, height;

  if (!gst_video_format_parse_caps (caps, &format, &width, &height))
    return FALSE;

  *size = gst_video_format_get_size (format, width, height);

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  GST_DEBUG_OBJECT (btrans, "unit size = %d for format %d w %d height %d",
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      *size, format, width, height);

  return TRUE;
}

static GstCaps *
gst_alpha_transform_caps (GstBaseTransform * btrans,
    GstPadDirection direction, GstCaps * caps)
{
  GstCaps *ret;
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  GstStructure *structure;
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  gint i;

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  ret = gst_caps_new_empty ();
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  /* When going from the SINK pad to the src, we just need to make sure the
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   * format is AYUV or one of the ARGB variants */
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  if (direction == GST_PAD_SINK) {
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    for (i = 0; i < gst_caps_get_size (caps); i++) {
      structure = gst_structure_copy (gst_caps_get_structure (caps, i));
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      gst_structure_remove_field (structure, "format");
      gst_structure_remove_field (structure, "endianness");
      gst_structure_remove_field (structure, "depth");
      gst_structure_remove_field (structure, "bpp");
      gst_structure_remove_field (structure, "red_mask");
      gst_structure_remove_field (structure, "green_mask");
      gst_structure_remove_field (structure, "blue_mask");
      gst_structure_remove_field (structure, "alpha_mask");
      gst_structure_remove_field (structure, "color-matrix");
      gst_structure_remove_field (structure, "chroma-site");

      gst_structure_set_name (structure, "video/x-raw-yuv");
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      gst_structure_set (structure, "format",
          GST_TYPE_FOURCC, GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'), NULL);
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      gst_caps_append_structure (ret, gst_structure_copy (structure));

      gst_structure_remove_field (structure, "format");
      gst_structure_set_name (structure, "video/x-raw-rgb");
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      gst_caps_append_structure (ret, structure);
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    }
  } else {
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    /* In the other direction, prepend a copy of the caps with format AYUV, 
     * and set the first to I420 */

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    for (i = 0; i < gst_caps_get_size (caps); i++) {
      structure = gst_structure_copy (gst_caps_get_structure (caps, i));
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      gst_structure_set_name (structure, "video/x-raw-yuv");

      gst_structure_remove_field (structure, "format");
      gst_structure_remove_field (structure, "endianness");
      gst_structure_remove_field (structure, "depth");
      gst_structure_remove_field (structure, "bpp");
      gst_structure_remove_field (structure, "red_mask");
      gst_structure_remove_field (structure, "green_mask");
      gst_structure_remove_field (structure, "blue_mask");
      gst_structure_remove_field (structure, "alpha_mask");
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      gst_structure_remove_field (structure, "color-matrix");
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      gst_structure_remove_field (structure, "chroma-site");
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      gst_structure_set (structure, "format",
          GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'), NULL);
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      gst_caps_append_structure (ret, gst_structure_copy (structure));
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      gst_structure_set (structure, "format",
          GST_TYPE_FOURCC, GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'), NULL);
      gst_caps_append_structure (ret, structure);
    }
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  }

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  gst_caps_do_simplify (ret);

  return ret;
}

static gboolean
gst_alpha_set_caps (GstBaseTransform * btrans,
    GstCaps * incaps, GstCaps * outcaps)
{
  GstAlpha *alpha = GST_ALPHA (btrans);
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  const gchar *matrix;

  GST_OBJECT_LOCK (alpha);
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  if (!gst_video_format_parse_caps (incaps, &alpha->in_format,
          &alpha->width, &alpha->height) ||
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      !gst_video_format_parse_caps (outcaps, &alpha->out_format,
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          &alpha->width, &alpha->height)) {
    GST_OBJECT_UNLOCK (alpha);
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    return FALSE;
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  }

  if (!gst_alpha_set_process_function (alpha)) {
    GST_OBJECT_UNLOCK (alpha);
    return FALSE;
  }

  matrix = gst_video_parse_caps_color_matrix (incaps);
  alpha->in_sdtv = matrix ? g_str_equal (matrix, "sdtv") : TRUE;

  matrix = gst_video_parse_caps_color_matrix (outcaps);
  alpha->out_sdtv = matrix ? g_str_equal (matrix, "sdtv") : TRUE;

  gst_alpha_init_params (alpha);
  GST_OBJECT_UNLOCK (alpha);
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  return TRUE;
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}

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/* based on http://www.cs.utah.edu/~michael/chroma/
 */
static inline gint
chroma_keying_yuv (gint a, gint * y, guint ny, gint * u,
    gint * v, gint cr, gint cb, gint smin, gint smax, guint8 accept_angle_tg,
    guint8 accept_angle_ctg, guint8 one_over_kc, guint8 kfgy_scale, gint8 kg,
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    guint noise_level2)
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{
  gint tmp, tmp1;
  gint x1, y1;
  gint x, z;
  gint b_alpha;

  for (tmp = 0; tmp < ny; tmp++) {
    /* too dark or too bright, keep alpha */
    if (y[tmp] < smin || y[tmp] > smax)
      return a;
  }

  /* Convert foreground to XZ coords where X direction is defined by
     the key color */
  tmp = ((*u) * cb + (*v) * cr) >> 7;
  x = CLAMP (tmp, -128, 127);
  tmp = ((*v) * cb - (*u) * 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 = (x * accept_angle_tg) >> 4;
  tmp = MIN (tmp, 127);

  if (abs (z) > tmp) {
    /* keep foreground Kfg = 0 */
    return a;
  }
  /* Compute Kfg (implicitly) and Kbg, suppress foreground in XZ coord
     according to Kfg */
  tmp = (z * accept_angle_ctg) >> 4;
  tmp = CLAMP (tmp, -128, 127);
  x1 = abs (tmp);
  y1 = z;

  tmp1 = x - x1;
  tmp1 = MAX (tmp1, 0);
  b_alpha = (tmp1 * one_over_kc) / 2;
  b_alpha = 255 - CLAMP (b_alpha, 0, 255);
  b_alpha = (a * b_alpha) >> 8;

  tmp = (tmp1 * kfgy_scale) >> 4;
  tmp1 = MIN (tmp, 255);

  for (tmp = 0; tmp < ny; tmp++)
    y[tmp] = (y[tmp] < tmp1) ? 0 : y[tmp] - tmp1;

  /* Convert suppressed foreground back to CbCr */
  tmp = (x1 * cb - y1 * cr) >> 7;
  *u = CLAMP (tmp, -128, 127);

  tmp = (x1 * cr + y1 * 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 * z + (x - kg) * (x - kg);
  tmp = MIN (tmp, 0xffff);

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  if (tmp < noise_level2)
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    b_alpha = 0;

  return b_alpha;
}

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#define APPLY_MATRIX(m,o,v1,v2,v3) ((m[o*4] * v1 + m[o*4+1] * v2 + m[o*4+2] * v3 + m[o*4+3]) >> 8)

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static void
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gst_alpha_set_ayuv_ayuv (const guint8 * src, guint8 * dest, gint width,
    gint height, GstAlpha * alpha)
{
  gint s_alpha = CLAMP ((gint) (alpha->alpha * 256), 0, 256);
  gint y, x;

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  if (alpha->in_sdtv == alpha->out_sdtv) {
    for (y = 0; y < height; y++) {
      for (x = 0; x < width; x++) {
        dest[0] = (src[0] * s_alpha) >> 8;
        dest[1] = src[1];
        dest[2] = src[2];
        dest[3] = src[3];

        dest += 4;
        src += 4;
      }
    }
  } else {
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    gint matrix[12];

    memcpy (matrix,
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        alpha->out_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
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        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));
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    for (y = 0; y < height; y++) {
      for (x = 0; x < width; x++) {
        dest[0] = (src[0] * s_alpha) >> 8;
        dest[1] = APPLY_MATRIX (matrix, 0, src[1], src[2], src[3]);
        dest[2] = APPLY_MATRIX (matrix, 1, src[1], src[2], src[3]);
        dest[3] = APPLY_MATRIX (matrix, 2, src[1], src[2], src[3]);

        dest += 4;
        src += 4;
      }
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    }
  }
}

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#define CREATE_AYUV_ARGB_FUNCTIONS(name, A, R, G, B) \
static void \
gst_alpha_set_ayuv_##name (const guint8 * src, guint8 * dest, gint width, \
    gint height, GstAlpha * alpha) \
{ \
  gint s_alpha = CLAMP ((gint) (alpha->alpha * 256), 0, 256); \
  gint y, x; \
  gint matrix[12]; \
  gint r, g, b; \
  \
  memcpy (matrix, \
      alpha->in_sdtv ? cog_ycbcr_to_rgb_matrix_8bit_sdtv : \
      cog_ycbcr_to_rgb_matrix_8bit_hdtv, 12 * sizeof (gint)); \
  \
  for (y = 0; y < height; y++) { \
    for (x = 0; x < width; x++) { \
      dest[A] = (src[0] * s_alpha) >> 8; \
      \
      r = APPLY_MATRIX (matrix, 0, src[1], src[2], src[3]); \
      g = APPLY_MATRIX (matrix, 1, src[1], src[2], src[3]); \
      b = APPLY_MATRIX (matrix, 2, src[1], src[2], src[3]); \
      \
      dest[R] = CLAMP (r, 0, 255); \
      dest[G] = CLAMP (g, 0, 255); \
      dest[B] = CLAMP (b, 0, 255); \
      \
      dest += 4; \
      src += 4; \
    } \
  } \
} \
\
static void \
gst_alpha_chroma_key_ayuv_##name (const guint8 * src, guint8 * dest, gint width, \
    gint height, GstAlpha * alpha) \
{ \
  gint i, j; \
  gint a, y, u, v; \
  gint r, g, b; \
  gint smin, smax; \
  gint pa = CLAMP ((gint) (alpha->alpha * 256), 0, 256); \
  gint8 cb = alpha->cb, cr = alpha->cr; \
  gint8 kg = alpha->kg; \
  guint8 accept_angle_tg = alpha->accept_angle_tg; \
  guint8 accept_angle_ctg = alpha->accept_angle_ctg; \
  guint8 one_over_kc = alpha->one_over_kc; \
  guint8 kfgy_scale = alpha->kfgy_scale; \
  guint noise_level2 = alpha->noise_level2; \
  gint matrix[12]; \
  \
  smin = 128 - alpha->black_sensitivity; \
  smax = 128 + alpha->white_sensitivity; \
  \
  memcpy (matrix, \
      alpha->in_sdtv ? cog_ycbcr_to_rgb_matrix_8bit_sdtv : \
      cog_ycbcr_to_rgb_matrix_8bit_hdtv, 12 * sizeof (gint)); \
  \
  for (i = 0; i < height; i++) { \
    for (j = 0; j < width; j++) { \
      a = (src[0] * pa) >> 8; \
      y = src[1]; \
      u = src[2] - 128; \
      v = src[3] - 128; \
      \
      a = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, \
          smin, smax, accept_angle_tg, accept_angle_ctg, \
          one_over_kc, kfgy_scale, kg, noise_level2); \
      \
      u += 128; \
      v += 128; \
      \
      r = APPLY_MATRIX (matrix, 0, y, u, v); \
      g = APPLY_MATRIX (matrix, 1, y, u, v); \
      b = APPLY_MATRIX (matrix, 2, y, u, v); \
      \
      dest[A] = a; \
      dest[R] = CLAMP (r, 0, 255); \
      dest[G] = CLAMP (g, 0, 255); \
      dest[B] = CLAMP (b, 0, 255); \
      \
      src += 4; \
      dest += 4; \
    } \
  } \
}

CREATE_AYUV_ARGB_FUNCTIONS (argb, 0, 1, 2, 3);
CREATE_AYUV_ARGB_FUNCTIONS (abgr, 0, 3, 2, 1);
CREATE_AYUV_ARGB_FUNCTIONS (rgba, 3, 0, 1, 2);
CREATE_AYUV_ARGB_FUNCTIONS (bgra, 3, 2, 1, 0);

static void
gst_alpha_chroma_key_ayuv_ayuv (const guint8 * src, guint8 * dest,
    gint width, gint height, GstAlpha * alpha)
{
  gint i, j;
  gint a, y, u, v;
  gint smin, smax;
  gint pa = CLAMP ((gint) (alpha->alpha * 256), 0, 256);
  gint8 cb = alpha->cb, cr = alpha->cr;
  gint8 kg = alpha->kg;
  guint8 accept_angle_tg = alpha->accept_angle_tg;
  guint8 accept_angle_ctg = alpha->accept_angle_ctg;
  guint8 one_over_kc = alpha->one_over_kc;
  guint8 kfgy_scale = alpha->kfgy_scale;
  guint noise_level2 = alpha->noise_level2;

  smin = 128 - alpha->black_sensitivity;
  smax = 128 + alpha->white_sensitivity;

  if (alpha->in_sdtv == alpha->out_sdtv) {
    for (i = 0; i < height; i++) {
      for (j = 0; j < width; j++) {
        a = (src[0] * pa) >> 8;
        y = src[1];
        u = src[2] - 128;
        v = src[3] - 128;

        a = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb,
            smin, smax, accept_angle_tg, accept_angle_ctg,
            one_over_kc, kfgy_scale, kg, noise_level2);

        u += 128;
        v += 128;

        dest[0] = a;
        dest[1] = y;
        dest[2] = u;
        dest[3] = v;

        src += 4;
        dest += 4;
      }
    }
  } else {
    gint matrix[12];

    memcpy (matrix,
        alpha->out_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));

    for (i = 0; i < height; i++) {
      for (j = 0; j < width; j++) {
        a = (src[0] * pa) >> 8;
        y = APPLY_MATRIX (matrix, 0, src[1], src[2], src[3]);
        u = APPLY_MATRIX (matrix, 1, src[1], src[2], src[3]) - 128;
        v = APPLY_MATRIX (matrix, 2, src[1], src[2], src[3]) - 128;

        a = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb,
            smin, smax, accept_angle_tg, accept_angle_ctg,
            one_over_kc, kfgy_scale, kg, noise_level2);

        u += 128;
        v += 128;

        dest[0] = a;
        dest[1] = y;
        dest[2] = u;
        dest[3] = v;

        src += 4;
        dest += 4;
      }
    }
  }
}

#define CREATE_I420_ARGB_FUNCTIONS(name, A, R, G, B) \
static void \
gst_alpha_set_i420_##name (const guint8 * src, guint8 * dest, gint width, \
    gint height, GstAlpha * alpha) \
{ \
  gint b_alpha = CLAMP ((gint) (alpha->alpha * 255), 0, 255); \
  const guint8 *srcY; \
  const guint8 *srcU; \
  const guint8 *srcV; \
  gint i, j; \
  gint src_wrap, src_uv_wrap; \
  gint y_stride, uv_stride; \
  gboolean odd_width; \
  gint matrix[12]; \
  gint r, g, b; \
  \
  y_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width); \
  uv_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width); \
  \
  src_wrap = y_stride - width; \
  src_uv_wrap = uv_stride - (width / 2); \
  \
  srcY = src; \
  srcU = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, \
      1, width, height); \
  srcV = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, \
      2, width, height); \
  \
  odd_width = (width % 2 != 0); \
  \
  memcpy (matrix, \
      alpha->in_sdtv ? cog_ycbcr_to_rgb_matrix_8bit_sdtv : \
      cog_ycbcr_to_rgb_matrix_8bit_hdtv, 12 * sizeof (gint)); \
  \
  for (i = 0; i < height; i++) { \
    for (j = 0; j < width / 2; j++) { \
      dest[A] = b_alpha; \
      r = APPLY_MATRIX (matrix, 0, srcY[0], srcU[0], srcV[0]); \
      g = APPLY_MATRIX (matrix, 1, srcY[0], srcU[0], srcV[0]); \
      b = APPLY_MATRIX (matrix, 2, srcY[0], srcU[0], srcV[0]); \
      dest[R] = CLAMP (r, 0, 255); \
      dest[G] = CLAMP (g, 0, 255); \
      dest[B] = CLAMP (b, 0, 255); \
      \
      dest[4 + A] = b_alpha; \
      r = APPLY_MATRIX (matrix, 0, srcY[1], srcU[0], srcV[0]); \
      g = APPLY_MATRIX (matrix, 1, srcY[1], srcU[0], srcV[0]); \
      b = APPLY_MATRIX (matrix, 2, srcY[1], srcU[0], srcV[0]); \
      dest[4 + R] = CLAMP (r, 0, 255); \
      dest[4 + G] = CLAMP (g, 0, 255); \
      dest[4 + B] = CLAMP (b, 0, 255); \
      \
      dest += 8; \
      srcY += 2; \
      srcU++; \
      srcV++; \
    } \
    /* Might have one odd column left to do */ \
    if (odd_width) { \
      dest[A] = b_alpha; \
      r = APPLY_MATRIX (matrix, 0, srcY[0], srcU[0], srcV[0]); \
      g = APPLY_MATRIX (matrix, 1, srcY[0], srcU[0], srcV[0]); \
      b = APPLY_MATRIX (matrix, 2, srcY[0], srcU[0], srcV[0]); \
      dest[R] = CLAMP (r, 0, 255); \
      dest[G] = CLAMP (g, 0, 255); \
      dest[B] = CLAMP (b, 0, 255); \
      \
      dest += 4; \
      srcY++; \
    } \
    if (i % 2 == 0) { \
      srcU -= width / 2; \
      srcV -= width / 2; \
    } else { \
      srcU += src_uv_wrap; \
      srcV += src_uv_wrap; \
    } \
    srcY += src_wrap; \
  } \
} \
\
static inline void \
gst_alpha_chromakey_row_i420_##name (GstAlpha * alpha, guint8 * dest1, \
    guint8 * dest2, const guint8 * srcY1, const guint8 * srcY2, \
    const guint8 * srcU, const guint8 * srcV, gint width) \
{ \
  gint xpos; \
  gint a, a2, u, v; \
  gint r, g, b; \
  gint smin, smax; \
  gint8 cb = alpha->cb, cr = alpha->cr; \
  gint8 kg = alpha->kg; \
  guint8 accept_angle_tg = alpha->accept_angle_tg; \
  guint8 accept_angle_ctg = alpha->accept_angle_ctg; \
  guint8 one_over_kc = alpha->one_over_kc; \
  guint8 kfgy_scale = alpha->kfgy_scale; \
  guint noise_level2 = alpha->noise_level2; \
  gint matrix[12], y; \
  \
  a = CLAMP ((gint) (alpha->alpha * 255), 0, 255); \
  smin = 128 - alpha->black_sensitivity; \
  smax = 128 + alpha->white_sensitivity; \
  \
  memcpy (matrix, \
      alpha->in_sdtv ? cog_ycbcr_to_rgb_matrix_8bit_sdtv : \
      cog_ycbcr_to_rgb_matrix_8bit_hdtv, 12 * sizeof (gint)); \
  \
  for (xpos = 0; xpos < width / 2; xpos++) { \
    y = srcY1[0]; \
    u = srcU[0] - 128; \
    v = srcV[0] - 128; \
    \
    a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin, \
        smax, accept_angle_tg, accept_angle_ctg, \
        one_over_kc, kfgy_scale, kg, noise_level2); \
    \
    u += 128; \
    v += 128; \
    \
    r = APPLY_MATRIX (matrix, 0, y, u, v); \
    g = APPLY_MATRIX (matrix, 1, y, u, v); \
    b = APPLY_MATRIX (matrix, 2, y, u, v); \
    \
    dest1[A] = a2; \
    dest1[R] = CLAMP (r, 0, 255); \
    dest1[G] = CLAMP (g, 0, 255); \
    dest1[B] = CLAMP (b, 0, 255); \
    \
    y = srcY1[1]; \
    u = srcU[0] - 128; \
    v = srcV[0] - 128; \
    \
    a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin, \
        smax, accept_angle_tg, accept_angle_ctg, \
        one_over_kc, kfgy_scale, kg, noise_level2); \
    \
    u += 128; \
    v += 128; \
    \
    r = APPLY_MATRIX (matrix, 0, y, u, v); \
    g = APPLY_MATRIX (matrix, 1, y, u, v); \
    b = APPLY_MATRIX (matrix, 2, y, u, v); \
    \
    dest1[4 + A] = a2; \
    dest1[4 + R] = CLAMP (r, 0, 255); \
    dest1[4 + G] = CLAMP (g, 0, 255); \
    dest1[4 + B] = CLAMP (b, 0, 255); \
    \
    y = srcY2[0]; \
    u = srcU[0] - 128; \
    v = srcV[0] - 128; \
    \
    a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin, \
        smax, accept_angle_tg, accept_angle_ctg, \
        one_over_kc, kfgy_scale, kg, noise_level2); \
    \
    u += 128; \
    v += 128; \
    \
    r = APPLY_MATRIX (matrix, 0, y, u, v); \
    g = APPLY_MATRIX (matrix, 1, y, u, v); \
    b = APPLY_MATRIX (matrix, 2, y, u, v); \
    \
    dest2[A] = a2; \
    dest2[R] = CLAMP (r, 0, 255); \
    dest2[G] = CLAMP (g, 0, 255); \
    dest2[B] = CLAMP (b, 0, 255); \
    \
    y = srcY2[1]; \
    u = srcU[0] - 128; \
    v = srcV[0] - 128; \
    \
    a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin, \
        smax, accept_angle_tg, accept_angle_ctg, \
        one_over_kc, kfgy_scale, kg, noise_level2); \
    \
    u += 128; \
    v += 128; \
    \
    r = APPLY_MATRIX (matrix, 0, y, u, v); \
    g = APPLY_MATRIX (matrix, 1, y, u, v); \
    b = APPLY_MATRIX (matrix, 2, y, u, v); \
    \
    dest2[4 + A] = a2; \
    dest2[4 + R] = CLAMP (r, 0, 255); \
    dest2[4 + G] = CLAMP (g, 0, 255); \
    dest2[4 + B] = CLAMP (b, 0, 255); \
    \
    srcY1 += 2; \
    srcY2 += 2; \
    srcU++; \
    srcV++; \
    dest1 += 8; \
    dest2 += 8; \
  } \
} \
\
static void \
gst_alpha_chroma_key_i420_##name (const guint8 * src, guint8 * dest, \
    gint width, gint height, GstAlpha * alpha) \
{ \
  const guint8 *srcY1, *srcY2, *srcU, *srcV; \
  guint8 *dest1, *dest2; \
  gint ypos; \
  gint dest_stride, src_y_stride, src_uv_stride; \
  \
  dest_stride = \
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_AYUV, 0, width); \
  src_y_stride = \
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width); \
  src_uv_stride = \
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width); \
  \
  srcY1 = src; \
  srcY2 = src + src_y_stride; \
  \
  srcU = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, \
      1, width, height); \
  srcV = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420, \
      2, width, height); \
  \
  dest1 = dest; \
  dest2 = dest + dest_stride; \
  \
  /* Redefine Y strides to skip 2 lines at a time ... */ \
  dest_stride *= 2; \
  src_y_stride *= 2; \
  \
  for (ypos = 0; ypos < height / 2; ypos++) { \
    gst_alpha_chromakey_row_i420_##name (alpha, dest1, dest2, \
        srcY1, srcY2, srcU, srcV, width); \
    \
    dest1 += dest_stride; \
    dest2 += dest_stride; \
    srcY1 += src_y_stride; \
    srcY2 += src_y_stride; \
    srcU += src_uv_stride; \
    srcV += src_uv_stride; \
  } \
}

CREATE_I420_ARGB_FUNCTIONS (argb, 0, 1, 2, 3);
CREATE_I420_ARGB_FUNCTIONS (abgr, 0, 3, 2, 1);
CREATE_I420_ARGB_FUNCTIONS (rgba, 3, 0, 1, 2);
CREATE_I420_ARGB_FUNCTIONS (bgra, 3, 2, 1, 0);

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static void
gst_alpha_set_i420_ayuv (const guint8 * src, guint8 * dest, gint width,
    gint height, GstAlpha * alpha)
{
  gint b_alpha = CLAMP ((gint) (alpha->alpha * 255), 0, 255);
  const guint8 *srcY;
  const guint8 *srcU;
  const guint8 *srcV;
  gint i, j;
  gint src_wrap, src_uv_wrap;
  gint y_stride, uv_stride;
  gboolean odd_width;

  y_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width);
  uv_stride = gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width);

  src_wrap = y_stride - width;
  src_uv_wrap = uv_stride - (width / 2);

  srcY = src;
  srcU = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420,
      1, width, height);
  srcV = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420,
      2, width, height);

  odd_width = (width % 2 != 0);

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  if (alpha->in_sdtv == alpha->out_sdtv) {
    for (i = 0; i < height; i++) {
      for (j = 0; j < width / 2; j++) {
        dest[0] = b_alpha;
        dest[1] = srcY[0];
        dest[2] = srcU[0];
        dest[3] = srcV[0];
        dest[4] = b_alpha;
        dest[5] = srcY[1];
        dest[6] = srcU[0];
        dest[7] = srcV[0];

        dest += 8;
        srcY += 2;
        srcU++;
        srcV++;
      }
      /* Might have one odd column left to do */
      if (odd_width) {
        dest[0] = b_alpha;
        dest[1] = srcY[0];
        dest[2] = srcU[0];
        dest[3] = srcV[0];

        dest += 4;
        srcY++;
      }
      if (i % 2 == 0) {
        srcU -= width / 2;
        srcV -= width / 2;
      } else {
        srcU += src_uv_wrap;
        srcV += src_uv_wrap;
      }
      srcY += src_wrap;
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    }
1079
  } else {
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    gint matrix[12];

    memcpy (matrix,
1083
        alpha->out_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
1084
        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119

    for (i = 0; i < height; i++) {
      for (j = 0; j < width / 2; j++) {
        dest[0] = b_alpha;
        dest[1] = APPLY_MATRIX (matrix, 0, srcY[0], srcU[0], srcV[0]);
        dest[2] = APPLY_MATRIX (matrix, 1, srcY[0], srcU[0], srcV[0]);
        dest[3] = APPLY_MATRIX (matrix, 2, srcY[0], srcU[0], srcV[0]);
        dest[4] = b_alpha;
        dest[5] = APPLY_MATRIX (matrix, 0, srcY[1], srcU[0], srcV[0]);
        dest[6] = APPLY_MATRIX (matrix, 1, srcY[1], srcU[0], srcV[0]);
        dest[7] = APPLY_MATRIX (matrix, 2, srcY[1], srcU[0], srcV[0]);

        dest += 8;
        srcY += 2;
        srcU++;
        srcV++;
      }
      /* Might have one odd column left to do */
      if (odd_width) {
        dest[0] = b_alpha;
        dest[1] = APPLY_MATRIX (matrix, 0, srcY[0], srcU[0], srcV[0]);
        dest[2] = APPLY_MATRIX (matrix, 1, srcY[0], srcU[0], srcV[0]);
        dest[3] = APPLY_MATRIX (matrix, 2, srcY[0], srcU[0], srcV[0]);

        dest += 4;
        srcY++;
      }
      if (i % 2 == 0) {
        srcU -= width / 2;
        srcV -= width / 2;
      } else {
        srcU += src_uv_wrap;
        srcV += src_uv_wrap;
      }
      srcY += src_wrap;
1120 1121 1122 1123
    }
  }
}

1124
static inline void
1125 1126 1127
gst_alpha_chromakey_row_i420_ayuv (GstAlpha * alpha, guint8 * dest1,
    guint8 * dest2, const guint8 * srcY1, const guint8 * srcY2,
    const guint8 * srcU, const guint8 * srcV, gint width)
1128 1129
{
  gint xpos;
1130
  gint a, a2, u, v;
1131
  gint smin, smax;
1132 1133 1134 1135 1136 1137 1138
  gint8 cb = alpha->cb, cr = alpha->cr;
  gint8 kg = alpha->kg;
  guint8 accept_angle_tg = alpha->accept_angle_tg;
  guint8 accept_angle_ctg = alpha->accept_angle_ctg;
  guint8 one_over_kc = alpha->one_over_kc;
  guint8 kfgy_scale = alpha->kfgy_scale;
  guint noise_level2 = alpha->noise_level2;
1139

1140
  a = CLAMP ((gint) (alpha->alpha * 255), 0, 255);
1141 1142 1143
  smin = 128 - alpha->black_sensitivity;
  smax = 128 + alpha->white_sensitivity;

1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154
  if (alpha->in_sdtv == alpha->out_sdtv) {
    gint y[4];

    for (xpos = 0; xpos < width / 2; xpos++) {
      y[0] = srcY1[0];
      y[1] = srcY1[1];
      y[2] = srcY2[0];
      y[3] = srcY2[1];
      u = srcU[0] - 128;
      v = srcV[0] - 128;

1155 1156 1157
      a2 = chroma_keying_yuv (a, y, 4, &u, &v, cr, cb, smin,
          smax, accept_angle_tg, accept_angle_ctg,
          one_over_kc, kfgy_scale, kg, noise_level2);
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187

      u += 128;
      v += 128;

      dest1[0] = a2;
      dest1[1] = y[0];
      dest1[2] = u;
      dest1[3] = v;
      dest1[4] = a2;
      dest1[5] = y[1];
      dest1[6] = u;
      dest1[7] = v;

      dest2[0] = a2;
      dest2[1] = y[2];
      dest2[2] = u;
      dest2[3] = v;
      dest2[4] = a2;
      dest2[5] = y[3];
      dest2[6] = u;
      dest2[7] = v;

      srcY1 += 2;
      srcY2 += 2;
      srcU++;
      srcV++;
      dest1 += 8;
      dest2 += 8;
    }
  } else {
1188 1189 1190
    gint matrix[12], y;

    memcpy (matrix,
1191
        alpha->out_sdtv ? cog_ycbcr_hdtv_to_ycbcr_sdtv_matrix_8bit :
1192
        cog_ycbcr_sdtv_to_ycbcr_hdtv_matrix_8bit, 12 * sizeof (gint));
1193 1194 1195 1196 1197 1198

    for (xpos = 0; xpos < width / 2; xpos++) {
      y = APPLY_MATRIX (matrix, 0, srcY1[0], srcU[0], srcV[0]);
      u = APPLY_MATRIX (matrix, 1, srcY1[0], srcU[0], srcV[0]) - 128;
      v = APPLY_MATRIX (matrix, 2, srcY1[0], srcU[0], srcV[0]) - 128;

1199 1200 1201
      a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin,
          smax, accept_angle_tg, accept_angle_ctg,
          one_over_kc, kfgy_scale, kg, noise_level2);
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214

      u += 128;
      v += 128;

      dest1[0] = a2;
      dest1[1] = y;
      dest1[2] = u;
      dest1[3] = v;

      y = APPLY_MATRIX (matrix, 0, srcY1[1], srcU[0], srcV[0]);
      u = APPLY_MATRIX (matrix, 1, srcY1[1], srcU[0], srcV[0]) - 128;
      v = APPLY_MATRIX (matrix, 2, srcY1[1], srcU[0], srcV[0]) - 128;

1215 1216 1217
      a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin,
          smax, accept_angle_tg, accept_angle_ctg,
          one_over_kc, kfgy_scale, kg, noise_level2);
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230

      u += 128;
      v += 128;

      dest1[4] = a2;
      dest1[5] = y;
      dest1[6] = u;
      dest1[7] = v;

      y = APPLY_MATRIX (matrix, 0, srcY2[0], srcU[0], srcV[0]);
      u = APPLY_MATRIX (matrix, 1, srcY2[0], srcU[0], srcV[0]) - 128;
      v = APPLY_MATRIX (matrix, 2, srcY2[0], srcU[0], srcV[0]) - 128;

1231 1232 1233
      a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin,
          smax, accept_angle_tg, accept_angle_ctg,
          one_over_kc, kfgy_scale, kg, noise_level2);
1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246

      u += 128;
      v += 128;

      dest2[0] = a2;
      dest2[1] = y;
      dest2[2] = u;
      dest2[3] = v;

      y = APPLY_MATRIX (matrix, 0, srcY2[1], srcU[0], srcV[0]);
      u = APPLY_MATRIX (matrix, 1, srcY2[1], srcU[0], srcV[0]) - 128;
      v = APPLY_MATRIX (matrix, 2, srcY2[1], srcU[0], srcV[0]) - 128;

1247 1248 1249
      a2 = chroma_keying_yuv (a, &y, 1, &u, &v, cr, cb, smin,
          smax, accept_angle_tg, accept_angle_ctg,
          one_over_kc, kfgy_scale, kg, noise_level2);
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265

      u += 128;
      v += 128;

      dest2[4] = a2;
      dest2[5] = y;
      dest2[6] = u;
      dest2[7] = v;

      srcY1 += 2;
      srcY2 += 2;
      srcU++;
      srcV++;
      dest1 += 8;
      dest2 += 8;
    }
1266 1267
  }
}
1268

1269
static void
1270 1271
gst_alpha_chroma_key_i420_ayuv (const guint8 * src, guint8 * dest,
    gint width, gint height, GstAlpha * alpha)
1272
{
1273
  const guint8 *srcY1, *srcY2, *srcU, *srcV;
1274 1275 1276
  guint8 *dest1, *dest2;
  gint ypos;
  gint dest_stride, src_y_stride, src_uv_stride;
1277

1278 1279 1280 1281 1282 1283
  dest_stride =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_AYUV, 0, width);
  src_y_stride =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 0, width);
  src_uv_stride =
      gst_video_format_get_row_stride (GST_VIDEO_FORMAT_I420, 1, width);
1284

1285 1286
  srcY1 = src;
  srcY2 = src + src_y_stride;
1287

1288 1289 1290 1291
  srcU = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420,
      1, width, height);
  srcV = src + gst_video_format_get_component_offset (GST_VIDEO_FORMAT_I420,
      2, width, height);
1292

1293 1294
  dest1 = dest;
  dest2 = dest + dest_stride;
1295

1296 1297 1298
  /* Redefine Y strides to skip 2 lines at a time ... */
  dest_stride *= 2;
  src_y_stride *= 2;
1299

1300
  for (ypos = 0; ypos < height / 2; ypos++) {
1301
    gst_alpha_chromakey_row_i420_ayuv (alpha, dest1, dest2,
1302
        srcY1, srcY2, srcU, srcV, width);
1303

1304 1305 1306 1307 1308 1309
    dest1 += dest_stride;
    dest2 += dest_stride;
    srcY1 += src_y_stride;
    srcY2 += src_y_stride;
    srcU += src_uv_stride;
    srcV += src_uv_stride;
1310 1311 1312
  }
}

1313 1314 1315
static void
gst_alpha_init_params (GstAlpha * alpha)
{
1316 1317 1318 1319
  gfloat kgl;
  gfloat tmp;
  gfloat tmp1, tmp2;
  gfloat y;
1320 1321
  const gint *matrix;

1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343
  /* RGB->RGB: convert to SDTV YUV, chroma keying, convert back
   * YUV->RGB: chroma keying, convert to RGB
   * RGB->YUV: convert to YUV, chroma keying
   * YUV->YUV: convert matrix, chroma keying
   */
  if (gst_video_format_is_rgb (alpha->in_format)
      && gst_video_format_is_rgb (alpha->out_format))
    matrix = cog_rgb_to_ycbcr_matrix_8bit_sdtv;
  else if (gst_video_format_is_yuv (alpha->in_format)
      && gst_video_format_is_rgb (alpha->out_format))
    matrix =
        (alpha->in_sdtv) ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
        cog_rgb_to_ycbcr_matrix_8bit_hdtv;
  else if (gst_video_format_is_rgb (alpha->in_format)
      && gst_video_format_is_yuv (alpha->out_format))
    matrix =
        (alpha->out_sdtv) ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
        cog_rgb_to_ycbcr_matrix_8bit_hdtv;
  else                          /* yuv -> yuv */
    matrix =
        (alpha->out_sdtv) ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
        cog_rgb_to_ycbcr_matrix_8bit_hdtv;
1344

1345
  y = (matrix[0] * ((gint) alpha->target_r) +
1346 1347 1348 1349 1350
      matrix[1] * ((gint) alpha->target_g) +
      matrix[2] * ((gint) alpha->target_b) + matrix[3]) >> 8;
  /* Cb,Cr without offset here because the chroma keying
   * works with them being in range [-128,127]
   */
1351
  tmp1 =
1352 1353 1354
      (matrix[4] * ((gint) alpha->target_r) +
      matrix[5] * ((gint) alpha->target_g) +
      matrix[6] * ((gint) alpha->target_b)) >> 8;
1355
  tmp2 =
1356 1357 1358 1359
      (matrix[8] * ((gint) alpha->target_r) +
      matrix[9] * ((gint) alpha->target_g) +
      matrix[10] * ((gint) alpha->target_b)) >> 8;

1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371
  kgl = sqrt (tmp1 * tmp1 + tmp2 * tmp2);
  alpha->cb = 127 * (tmp1 / kgl);
  alpha->cr = 127 * (tmp2 / kgl);

  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;
1372
  tmp = 15 * y / kgl;
1373 1374 1375
  tmp = MIN (tmp, 255);
  alpha->kfgy_scale = tmp;
  alpha->kg = MIN (kgl, 127);
1376 1377

  alpha->noise_level2 = alpha->noise_level * alpha->noise_level;
1378 1379
}

1380 1381 1382 1383
static gboolean
gst_alpha_set_process_function (GstAlpha * alpha)
{
  alpha->process = NULL;
1384

1385 1386 1387 1388 1389 1390
  switch (alpha->method) {
    case ALPHA_METHOD_SET:
      switch (alpha->out_format) {
        case GST_VIDEO_FORMAT_AYUV:
          switch (alpha->in_format) {
            case GST_VIDEO_FORMAT_AYUV:
1391
              alpha->process = gst_alpha_set_ayuv_ayuv;
1392 1393
              break;
            case GST_VIDEO_FORMAT_I420:
1394
              alpha->process = gst_alpha_set_i420_ayuv;