gstalpha.c 75.3 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.
 */

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/**
 * SECTION:element-alpha
 * 
 * The alpha element adds an alpha channel to a video stream. The values
 * of the alpha channel can be either be set to a constant or can be
 * dynamically calculated via chroma keying, e.g. blue can be set as
 * the transparent color.
 *
 * Sample pipeline:
 * |[
 * gst-launch videotestsrc pattern=smpte75 ! alpha method=green ! \
 *   videomixer name=mixer ! ffmpegcolorspace ! autovideosink     \
 *   videotestsrc pattern=snow ! mixer.
 * ]| This pipeline adds a alpha channel to the SMPTE color bars
 * with green as the transparent color and mixes the output with
 * a snow video stream.
 */


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#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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#define DEFAULT_PREFER_PASSTHROUGH FALSE
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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,
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  PROP_PREFER_PASSTHROUGH,
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  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 ";"
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        GST_VIDEO_CAPS_ABGR ";" GST_VIDEO_CAPS_RGBA
        ";" GST_VIDEO_CAPS_YUV ("Y444")
        ";" GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_BGRx ";" GST_VIDEO_CAPS_xBGR
        ";" GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR
        ";" GST_VIDEO_CAPS_YUV ("Y42B") ";" GST_VIDEO_CAPS_YUV ("YUY2")
        ";" GST_VIDEO_CAPS_YUV ("YVYU") ";" GST_VIDEO_CAPS_YUV ("UYVY")
        ";" GST_VIDEO_CAPS_YUV ("I420") ";" GST_VIDEO_CAPS_YUV ("YV12")
        ";" GST_VIDEO_CAPS_YUV ("Y41B"))
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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")
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        ";" GST_VIDEO_CAPS_ARGB ";" GST_VIDEO_CAPS_BGRA ";" GST_VIDEO_CAPS_ABGR
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        ";" GST_VIDEO_CAPS_RGBA ";" GST_VIDEO_CAPS_YUV ("Y444")
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        ";" GST_VIDEO_CAPS_xRGB ";" GST_VIDEO_CAPS_BGRx ";" GST_VIDEO_CAPS_xBGR
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        ";" GST_VIDEO_CAPS_RGBx ";" GST_VIDEO_CAPS_RGB ";" GST_VIDEO_CAPS_BGR
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        ";" GST_VIDEO_CAPS_YUV ("Y42B") ";" GST_VIDEO_CAPS_YUV ("YUY2")
        ";" GST_VIDEO_CAPS_YUV ("YVYU") ";" GST_VIDEO_CAPS_YUV ("UYVY")
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        ";" GST_VIDEO_CAPS_YUV ("I420") ";" GST_VIDEO_CAPS_YUV ("YV12")
        ";" GST_VIDEO_CAPS_YUV ("Y41B")
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    )
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    );

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static GstStaticCaps gst_alpha_alpha_caps =
    GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV")
    ";" GST_VIDEO_CAPS_ARGB ";" GST_VIDEO_CAPS_BGRA ";" GST_VIDEO_CAPS_ABGR ";"
    GST_VIDEO_CAPS_RGBA);

#define GST_ALPHA_LOCK(alpha) G_STMT_START { \
  GST_LOG_OBJECT (alpha, "Locking alpha from thread %p", g_thread_self ()); \
  g_static_mutex_lock (&alpha->lock); \
  GST_LOG_OBJECT (alpha, "Locked alpha from thread %p", g_thread_self ()); \
} G_STMT_END

#define GST_ALPHA_UNLOCK(alpha) G_STMT_START { \
  GST_LOG_OBJECT (alpha, "Unlocking alpha from thread %p", g_thread_self ()); \
  g_static_mutex_unlock (&alpha->lock); \
} G_STMT_END

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static gboolean gst_alpha_start (GstBaseTransform * trans);
static gboolean gst_alpha_get_unit_size (GstBaseTransform * btrans,
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    GstCaps * caps, gsize * size);
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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_before_transform (GstBaseTransform * btrans,
    GstBuffer * buf);
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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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static void gst_alpha_finalize (GObject * object);
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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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  gobject_class->finalize = gst_alpha_finalize;
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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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  g_object_class_install_property (G_OBJECT_CLASS (klass),
      PROP_PREFER_PASSTHROUGH, g_param_spec_boolean ("prefer-passthrough",
          "Prefer Passthrough",
          "Don't do any processing for alpha=1.0 if possible",
          DEFAULT_PREFER_PASSTHROUGH,
          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);
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  btrans_class->before_transform =
      GST_DEBUG_FUNCPTR (gst_alpha_before_transform);
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  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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  g_static_mutex_init (&alpha->lock);
}

static void
gst_alpha_finalize (GObject * object)
{
  GstAlpha *alpha = GST_ALPHA (object);

  g_static_mutex_free (&alpha->lock);

  G_OBJECT_CLASS (parent_class)->finalize (object);
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}

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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  gboolean reconfigure = FALSE;
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  GST_ALPHA_LOCK (alpha);
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  switch (prop_id) {
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    case PROP_METHOD:{
      gint method = g_value_get_enum (value);

      reconfigure = (method != alpha->method) && (method == ALPHA_METHOD_SET
          || alpha->method == ALPHA_METHOD_SET) && (alpha->alpha == 1.0)
          && (alpha->prefer_passthrough);
      alpha->method = method;

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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:{
      gdouble a = g_value_get_double (value);

      reconfigure = (a != alpha->alpha) && (a == 1.0 || alpha->alpha == 1.0)
          && (alpha->method == ALPHA_METHOD_SET) && (alpha->prefer_passthrough);
      alpha->alpha = a;
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      break;
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    }
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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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    case PROP_PREFER_PASSTHROUGH:{
      gboolean prefer_passthrough = g_value_get_boolean (value);

      reconfigure = ((!!prefer_passthrough) != (!!alpha->prefer_passthrough))
          && (alpha->method == ALPHA_METHOD_SET) && (alpha->alpha == 1.0);
      alpha->prefer_passthrough = prefer_passthrough;
      break;
    }
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    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
  }
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  if (reconfigure)
    gst_base_transform_reconfigure (GST_BASE_TRANSFORM_CAST (alpha));

  GST_ALPHA_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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    case PROP_PREFER_PASSTHROUGH:
      g_value_set_boolean (value, alpha->prefer_passthrough);
      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,
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    GstCaps * caps, gsize * 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)
{
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  GstAlpha *alpha = GST_ALPHA (btrans);
  GstCaps *ret, *tmp, *tmp2;
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  GstStructure *structure;
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  gint i;

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  tmp = gst_caps_new_empty ();
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  GST_ALPHA_LOCK (alpha);
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  for (i = 0; i < gst_caps_get_size (caps); i++) {
    structure = gst_structure_copy (gst_caps_get_structure (caps, i));

    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_caps_append_structure (tmp, gst_structure_copy (structure));
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    gst_structure_set_name (structure, "video/x-raw-rgb");
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    gst_caps_append_structure (tmp, structure);
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  }

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  if (direction == GST_PAD_SINK) {
    tmp2 = gst_static_caps_get (&gst_alpha_alpha_caps);
    ret = gst_caps_intersect (tmp, tmp2);
    gst_caps_unref (tmp);
    gst_caps_unref (tmp2);
    tmp = ret;
    ret = NULL;

    if (alpha->prefer_passthrough && alpha->method == ALPHA_METHOD_SET
        && alpha->alpha == 1.0) {
      ret = gst_caps_copy (caps);
      gst_caps_append (ret, tmp);
      tmp = NULL;
    } else {
      ret = tmp;
      tmp = NULL;
    }
  } else {
    ret = tmp;
    tmp = NULL;
  }

  GST_DEBUG_OBJECT (alpha,
      "Transformed %" GST_PTR_FORMAT " -> %" GST_PTR_FORMAT, caps, ret);

  GST_ALPHA_UNLOCK (alpha);
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  return ret;
}

static gboolean
gst_alpha_set_caps (GstBaseTransform * btrans,
    GstCaps * incaps, GstCaps * outcaps)
{
  GstAlpha *alpha = GST_ALPHA (btrans);
544
  const gchar *matrix;
545
  gboolean passthrough;
546

547
  GST_ALPHA_LOCK (alpha);
548

549 550
  if (!gst_video_format_parse_caps (incaps, &alpha->in_format,
          &alpha->width, &alpha->height) ||
551
      !gst_video_format_parse_caps (outcaps, &alpha->out_format,
552
          &alpha->width, &alpha->height)) {
553 554 555 556
    GST_WARNING_OBJECT (alpha,
        "Failed to parse caps %" GST_PTR_FORMAT " -> %" GST_PTR_FORMAT, incaps,
        outcaps);
    GST_ALPHA_UNLOCK (alpha);
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    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;

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  passthrough = alpha->prefer_passthrough &&
      alpha->in_format == alpha->out_format && alpha->in_sdtv == alpha->out_sdtv
      && alpha->method == ALPHA_METHOD_SET && alpha->alpha == 1.0;

  GST_DEBUG_OBJECT (alpha,
      "Setting caps %" GST_PTR_FORMAT " -> %" GST_PTR_FORMAT
      " (passthrough: %d)", incaps, outcaps, passthrough);
  gst_base_transform_set_passthrough (btrans, passthrough);

  if (!gst_alpha_set_process_function (alpha) && !passthrough) {
    GST_WARNING_OBJECT (alpha,
        "No processing function for this caps and no passthrough mode");
    GST_ALPHA_UNLOCK (alpha);
    return FALSE;
  }

582
  gst_alpha_init_params (alpha);
583 584

  GST_ALPHA_UNLOCK (alpha);
585

586
  return TRUE;
587 588
}

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/* based on http://www.cs.utah.edu/~michael/chroma/
 */
static inline gint
592
chroma_keying_yuv (gint a, gint * y, gint * u,
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    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,
595
    guint noise_level2)
596 597 598 599 600 601
{
  gint tmp, tmp1;
  gint x1, y1;
  gint x, z;
  gint b_alpha;

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  /* too dark or too bright, keep alpha */
  if (*y < smin || *y > smax)
    return a;
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  /* 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);

644
  *y = (*y < tmp1) ? 0 : *y - tmp1;
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  /* 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);

660
  if (tmp < noise_level2)
661 662 663 664 665
    b_alpha = 0;

  return b_alpha;
}

666 667
#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
gst_alpha_set_argb_ayuv (const guint8 * src, guint8 * dest, gint width,
    gint height, GstAlpha * alpha)
{
  gint s_alpha = CLAMP ((gint) (alpha->alpha * 256), 0, 256);
  gint i, j;
  gint matrix[12];
  gint y, u, v;
  gint o[4];

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 3, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[3] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

  memcpy (matrix,
      alpha->out_sdtv ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
      cog_rgb_to_ycbcr_matrix_8bit_hdtv, 12 * sizeof (gint));

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      dest[0] = (src[o[0]] * s_alpha) >> 8;

      y = APPLY_MATRIX (matrix, 0, src[o[1]], src[o[2]], src[o[3]]);
      u = APPLY_MATRIX (matrix, 1, src[o[1]], src[o[2]], src[o[3]]);
      v = APPLY_MATRIX (matrix, 2, src[o[1]], src[o[2]], src[o[3]]);

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

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

static void
gst_alpha_chroma_key_argb_ayuv (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];
  gint o[4];

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 3, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[3] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

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

  memcpy (matrix,
      alpha->out_sdtv ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
      cog_rgb_to_ycbcr_matrix_8bit_hdtv, 12 * sizeof (gint));

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      a = (src[o[0]] * pa) >> 8;
      r = src[o[1]];
      g = src[o[2]];
      b = src[o[3]];

      y = APPLY_MATRIX (matrix, 0, r, g, b);
      u = APPLY_MATRIX (matrix, 1, r, g, b) - 128;
      v = APPLY_MATRIX (matrix, 2, r, g, b) - 128;

      a = chroma_keying_yuv (a, &y, &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;
    }
  }
}

static void
gst_alpha_set_argb_argb (const guint8 * src, guint8 * dest, gint width,
    gint height, GstAlpha * alpha)
{
  gint s_alpha = CLAMP ((gint) (alpha->alpha * 256), 0, 256);
  gint i, j;
  gint p[4], o[4];

  p[0] =
      gst_video_format_get_component_offset (alpha->out_format, 3, width,
      height);
  p[1] =
      gst_video_format_get_component_offset (alpha->out_format, 0, width,
      height);
  p[2] =
      gst_video_format_get_component_offset (alpha->out_format, 1, width,
      height);
  p[3] =
      gst_video_format_get_component_offset (alpha->out_format, 2, width,
      height);

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 3, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[3] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      dest[p[0]] = (src[o[0]] * s_alpha) >> 8;

      dest[p[1]] = src[o[1]];
      dest[p[2]] = src[o[2]];
      dest[p[3]] = src[o[3]];

      dest += 4;
      src += 4;
    }
  }
827
}
828

829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
static void
gst_alpha_chroma_key_argb_argb (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], matrix2[12];
  gint p[4], o[4];

  p[0] =
      gst_video_format_get_component_offset (alpha->out_format, 3, width,
      height);
  p[1] =
      gst_video_format_get_component_offset (alpha->out_format, 0, width,
      height);
  p[2] =
      gst_video_format_get_component_offset (alpha->out_format, 1, width,
      height);
  p[3] =
      gst_video_format_get_component_offset (alpha->out_format, 2, width,
      height);

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 3, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[3] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

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

  memcpy (matrix, cog_rgb_to_ycbcr_matrix_8bit_sdtv, 12 * sizeof (gint));
  memcpy (matrix2, cog_ycbcr_to_rgb_matrix_8bit_sdtv, 12 * sizeof (gint));

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      a = (src[o[0]] * pa) >> 8;
      r = src[o[1]];
      g = src[o[2]];
      b = src[o[3]];

      y = APPLY_MATRIX (matrix, 0, r, g, b);
      u = APPLY_MATRIX (matrix, 1, r, g, b) - 128;
      v = APPLY_MATRIX (matrix, 2, r, g, b) - 128;

      a = chroma_keying_yuv (a, &y, &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 (matrix2, 0, y, u, v);
      g = APPLY_MATRIX (matrix2, 1, y, u, v);
      b = APPLY_MATRIX (matrix2, 2, y, u, v);

      dest[p[0]] = a;
      dest[p[1]] = CLAMP (r, 0, 255);
      dest[p[2]] = CLAMP (g, 0, 255);
      dest[p[3]] = CLAMP (b, 0, 255);

      src += 4;
      dest += 4;
    }
  }
911
}
912

913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955
static void
gst_alpha_set_ayuv_argb (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;
  gint p[4];

  p[0] =
      gst_video_format_get_component_offset (alpha->out_format, 3, width,
      height);
  p[1] =
      gst_video_format_get_component_offset (alpha->out_format, 0, width,
      height);
  p[2] =
      gst_video_format_get_component_offset (alpha->out_format, 1, width,
      height);
  p[3] =
      gst_video_format_get_component_offset (alpha->out_format, 2, width,
      height);

  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[p[0]] = (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[p[1]] = CLAMP (r, 0, 255);
      dest[p[2]] = CLAMP (g, 0, 255);
      dest[p[3]] = CLAMP (b, 0, 255);

      dest += 4;
      src += 4;
    }
  }
956 957
}

958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
static void
gst_alpha_chroma_key_ayuv_argb (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];
  gint p[4];

  p[0] =
      gst_video_format_get_component_offset (alpha->out_format, 3, width,
      height);
  p[1] =
      gst_video_format_get_component_offset (alpha->out_format, 0, width,
      height);
  p[2] =
      gst_video_format_get_component_offset (alpha->out_format, 1, width,
      height);
  p[3] =
      gst_video_format_get_component_offset (alpha->out_format, 2, width,
      height);

  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, &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[p[0]] = a;
      dest[p[1]] = CLAMP (r, 0, 255);
      dest[p[2]] = CLAMP (g, 0, 255);
      dest[p[3]] = CLAMP (b, 0, 255);

      src += 4;
      dest += 4;
    }
  }
}
1025

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static void
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;

  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 {
    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 (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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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;

1093
        a = chroma_keying_yuv (a, &y, &u, &v, cr, cb,
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 1120 1121 1122
            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;

1123
        a = chroma_keying_yuv (a, &y, &u, &v, cr, cb,
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            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;
      }
    }
  }
}

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static void
gst_alpha_set_rgb_ayuv (const guint8 * src, guint8 * dest, gint width,
    gint height, GstAlpha * alpha)
{
  gint s_alpha = CLAMP ((gint) (alpha->alpha * 255), 0, 255);
  gint i, j;
  gint matrix[12];
  gint y, u, v;
  gint o[3];
  gint bpp;

  bpp = gst_video_format_get_pixel_stride (alpha->in_format, 0);

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

  memcpy (matrix,
      alpha->out_sdtv ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
      cog_rgb_to_ycbcr_matrix_8bit_hdtv, 12 * sizeof (gint));

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      dest[0] = s_alpha;

      y = APPLY_MATRIX (matrix, 0, src[o[0]], src[o[1]], src[o[2]]);
      u = APPLY_MATRIX (matrix, 1, src[o[0]], src[o[1]], src[o[2]]);
      v = APPLY_MATRIX (matrix, 2, src[o[0]], src[o[1]], src[o[2]]);

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

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

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static void
gst_alpha_chroma_key_rgb_ayuv (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 * 255), 0, 255);
  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];
  gint o[3];
  gint bpp;

  bpp = gst_video_format_get_pixel_stride (alpha->in_format, 0);

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

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

  memcpy (matrix,
      alpha->out_sdtv ? cog_rgb_to_ycbcr_matrix_8bit_sdtv :
      cog_rgb_to_ycbcr_matrix_8bit_hdtv, 12 * sizeof (gint));

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      a = pa;
      r = src[o[0]];
      g = src[o[1]];
      b = src[o[2]];

      y = APPLY_MATRIX (matrix, 0, r, g, b);
      u = APPLY_MATRIX (matrix, 1, r, g, b) - 128;
      v = APPLY_MATRIX (matrix, 2, r, g, b) - 128;

      a = chroma_keying_yuv (a, &y, &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 += bpp;
      dest += 4;
    }
  }
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}

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static void
gst_alpha_set_rgb_argb (const guint8 * src, guint8 * dest, gint width,
    gint height, GstAlpha * alpha)
{
  gint s_alpha = CLAMP ((gint) (alpha->alpha * 255), 0, 255);
  gint i, j;
  gint p[4], o[3];
  gint bpp;

  bpp = gst_video_format_get_pixel_stride (alpha->in_format, 0);

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

  p[0] =
      gst_video_format_get_component_offset (alpha->out_format, 3, width,
      height);
  p[1] =
      gst_video_format_get_component_offset (alpha->out_format, 0, width,
      height);
  p[2] =
      gst_video_format_get_component_offset (alpha->out_format, 1, width,
      height);
  p[3] =
      gst_video_format_get_component_offset (alpha->out_format, 2, width,
      height);

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      dest[p[0]] = s_alpha;

      dest[p[1]] = src[o[0]];
      dest[p[2]] = src[o[1]];
      dest[p[3]] = src[o[2]];

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

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static void
gst_alpha_chroma_key_rgb_argb (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 * 255), 0, 255);
  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], matrix2[12];
  gint p[4], o[3];
  gint bpp;

  bpp = gst_video_format_get_pixel_stride (alpha->in_format, 0);

  o[0] =
      gst_video_format_get_component_offset (alpha->in_format, 0, width,
      height);
  o[1] =
      gst_video_format_get_component_offset (alpha->in_format, 1, width,
      height);
  o[2] =
      gst_video_format_get_component_offset (alpha->in_format, 2, width,
      height);

  p[0] =
      gst_video_format_get_component_offset (alpha->out_format, 3, width,
      height);
  p[1] =
      gst_video_format_get_component_offset (alpha->out_format, 0, width,
      height);
  p[2] =
      gst_video_format_get_component_offset (alpha->out_format, 1, width,
      height);
  p[3] =
      gst_video_format_get_component_offset (alpha->out_format, 2, width,
      height);

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

  memcpy (matrix, cog_rgb_to_ycbcr_matrix_8bit_sdtv, 12 * sizeof (gint));
  memcpy (matrix2, cog_ycbcr_to_rgb_matrix_8bit_sdtv, 12 * sizeof (gint));

  for (i = 0; i < height; i++) {
    for (j = 0; j < width; j++) {
      a = pa;
      r = src[o[0]];
      g = src[o[1]];
      b = src[o[2]];
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      y = APPLY_MATRIX (matrix, 0, r, g, b);
      u = APPLY_MATRIX (matrix, 1, r, g, b) - 128;
      v = APPLY_MATRIX (matrix, 2, r, g, b) - 128;

      a = chroma_keying_yuv (a, &y, &u, &v, cr, cb,
          smin, smax, accept_angle_tg, accept_angle_ctg,
          one_over_kc, kfgy_scale, kg, noise_level2);
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      u += 128;
      v += 128;
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      r = APPLY_MATRIX (matrix2, 0, y, u, v);
      g = APPLY_MATRIX (matrix2, 1, y, u, v);
      b = APPLY_MATRIX (matrix2, 2, y, u, v);
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      dest[p[0]] = a;
      dest[p[1]] = CLAMP (r, 0, 255);
      dest[p[2]] = CLAMP (g, 0, 255);
      dest[p[3]] = CLAMP (b, 0, 255);
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      src += bpp;
      dest += 4;
    }
  }
}
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static void
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gst_alpha_set_planar_yuv_ayuv (const guint8 * src, guint8 * dest, gint width,
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    gint height, GstAlpha * alpha)
{
  gint b_alpha = CLAMP ((gint) (alpha->alpha * 255), 0, 255);
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  const guint8 *srcY, *srcY_tmp;
  const guint8 *srcU, *srcU_tmp;
  const guint8 *srcV, *srcV_tmp;
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  gint i, j;
  gint y_stride, uv_stride;
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  gint v_subs, h_subs;
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