--- a/gst_plugins_good/gst/alpha/gstalpha.c Tue Jul 06 14:35:10 2010 +0300
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,930 +0,0 @@
-/* GStreamer
- * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
- * Copyright (C) <2007> Wim Taymans <wim.taymans@collabora.co.uk>
- * Copyright (C) <2007> Edward Hervey <edward.hervey@collabora.co.uk>
- * Copyright (C) <2007> Jan Schmidt <thaytan@noraisin.net>
- *
- * 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
-#include <gst/gst.h>
-#include <gst/base/gstbasetransform.h>
-#include <gst/video/video.h>
-#include <gst/controller/gstcontroller.h>
-
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-
-#ifndef M_PI
-#define M_PI 3.14159265358979323846
-#endif
-
-#define GST_TYPE_ALPHA \
- (gst_alpha_get_type())
-#define GST_ALPHA(obj) \
- (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ALPHA,GstAlpha))
-#define GST_ALPHA_CLASS(klass) \
- (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ALPHA,GstAlphaClass))
-#define GST_IS_ALPHA(obj) \
- (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ALPHA))
-#define GST_IS_ALPHA_CLASS(klass) \
- (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ALPHA))
-
-typedef struct _GstAlpha GstAlpha;
-typedef struct _GstAlphaClass GstAlphaClass;
-
-typedef enum
-{
- ALPHA_METHOD_SET,
- ALPHA_METHOD_GREEN,
- ALPHA_METHOD_BLUE,
- ALPHA_METHOD_CUSTOM,
-}
-GstAlphaMethod;
-
-GST_DEBUG_CATEGORY_STATIC (gst_alpha_debug);
-#define GST_CAT_DEFAULT gst_alpha_debug
-
-struct _GstAlpha
-{
- GstBaseTransform parent;
-
- /* caps */
- GstVideoFormat format;
- gint width, height;
- gboolean ayuv;
-
- gdouble alpha;
-
- guint target_r;
- guint target_g;
- guint target_b;
-
- GstAlphaMethod method;
-
- gfloat angle;
- gfloat noise_level;
- guint black_sensitivity;
- guint white_sensitivity;
-
- gfloat y; /* chroma color */
- gint8 cb, cr;
- gint8 kg;
- gfloat accept_angle_cos;
- gfloat accept_angle_sin;
- guint8 accept_angle_tg;
- guint8 accept_angle_ctg;
- guint8 one_over_kc;
- guint8 kfgy_scale;
-};
-
-struct _GstAlphaClass
-{
- GstBaseTransformClass parent_class;
-};
-
-/* elementfactory information */
-static const GstElementDetails gst_alpha_details =
-GST_ELEMENT_DETAILS ("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>");
-
-/* Alpha signals and args */
-enum
-{
- /* FILL ME */
- LAST_SIGNAL
-};
-
-#define DEFAULT_METHOD ALPHA_METHOD_SET
-#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
-#define DEFAULT_BLACK_SENSITIVITY 100
-#define DEFAULT_WHITE_SENSITIVITY 100
-
-enum
-{
- 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
-};
-
-static GstStaticPadTemplate gst_alpha_src_template =
-GST_STATIC_PAD_TEMPLATE ("src",
- GST_PAD_SRC,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV"))
- );
-
-static GstStaticPadTemplate gst_alpha_sink_template =
- GST_STATIC_PAD_TEMPLATE ("sink",
- GST_PAD_SINK,
- GST_PAD_ALWAYS,
- GST_STATIC_CAPS (GST_VIDEO_CAPS_YUV ("AYUV") ";" GST_VIDEO_CAPS_YUV ("I420")
- )
- );
-
-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);
-
-static void gst_alpha_init_params (GstAlpha * alpha);
-
-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);
-
-GST_BOILERPLATE (GstAlpha, gst_alpha, GstBaseTransform,
- GST_TYPE_BASE_TRANSFORM);
-
-#define GST_TYPE_ALPHA_METHOD (gst_alpha_method_get_type())
-static GType
-gst_alpha_method_get_type (void)
-{
- static GType alpha_method_type = 0;
- static const GEnumValue alpha_method[] = {
- {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"},
- {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);
-
- gst_element_class_set_details (element_class, &gst_alpha_details);
-
- 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));
-
- GST_DEBUG_CATEGORY_INIT (gst_alpha_debug, "alpha", 0,
- "alpha - Element for adding alpha channel to streams");
-}
-static void
-gst_alpha_class_init (GstAlphaClass * klass)
-{
- GObjectClass *gobject_class;
- GstBaseTransformClass *btrans_class;
-
- gobject_class = (GObjectClass *) klass;
- btrans_class = (GstBaseTransformClass *) klass;
-
- gobject_class->set_property = gst_alpha_set_property;
- gobject_class->get_property = gst_alpha_get_property;
-
- g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_METHOD,
- g_param_spec_enum ("method", "Method",
- "How the alpha channels should be created", GST_TYPE_ALPHA_METHOD,
- DEFAULT_METHOD, (GParamFlags) G_PARAM_READWRITE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ALPHA,
- g_param_spec_double ("alpha", "Alpha", "The value for the alpha channel",
- 0.0, 1.0, DEFAULT_ALPHA,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_R,
- g_param_spec_uint ("target_r", "Target Red", "The Red target", 0, 255,
- DEFAULT_TARGET_R,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_G,
- g_param_spec_uint ("target_g", "Target Green", "The Green target", 0, 255,
- DEFAULT_TARGET_G,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_B,
- g_param_spec_uint ("target_b", "Target Blue", "The Blue target", 0, 255,
- DEFAULT_TARGET_B,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ANGLE,
- g_param_spec_float ("angle", "Angle", "Size of the colorcube to change",
- 0.0, 90.0, DEFAULT_ANGLE,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
- g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_NOISE_LEVEL,
- g_param_spec_float ("noise_level", "Noise Level", "Size of noise radius",
- 0.0, 64.0, DEFAULT_NOISE_LEVEL,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
- 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,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
- 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,
- (GParamFlags) G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
-
-
- 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);
-}
-
-static void
-gst_alpha_init (GstAlpha * alpha, GstAlphaClass * klass)
-{
- alpha->alpha = DEFAULT_ALPHA;
- alpha->method = DEFAULT_METHOD;
- 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;
- alpha->black_sensitivity = DEFAULT_BLACK_SENSITIVITY;
- alpha->white_sensitivity = DEFAULT_WHITE_SENSITIVITY;
-}
-
-/* do we need this function? */
-static void
-gst_alpha_set_property (GObject * object, guint prop_id,
- const GValue * value, GParamSpec * pspec)
-{
- GstAlpha *alpha;
-
- g_return_if_fail (GST_IS_ALPHA (object));
-
- alpha = GST_ALPHA (object);
-
- switch (prop_id) {
- case PROP_METHOD:
- alpha->method = g_value_get_enum (value);
- switch (alpha->method) {
- case ALPHA_METHOD_GREEN:
- alpha->target_r = 0;
- alpha->target_g = 255;
- alpha->target_b = 0;
- break;
- case ALPHA_METHOD_BLUE:
- alpha->target_r = 0;
- alpha->target_g = 0;
- alpha->target_b = 255;
- break;
- default:
- break;
- }
- gst_alpha_init_params (alpha);
- break;
- case PROP_ALPHA:
- alpha->alpha = g_value_get_double (value);
- break;
- case PROP_TARGET_R:
- alpha->target_r = g_value_get_uint (value);
- gst_alpha_init_params (alpha);
- break;
- case PROP_TARGET_G:
- alpha->target_g = g_value_get_uint (value);
- gst_alpha_init_params (alpha);
- break;
- case PROP_TARGET_B:
- alpha->target_b = g_value_get_uint (value);
- gst_alpha_init_params (alpha);
- break;
- case PROP_ANGLE:
- alpha->angle = g_value_get_float (value);
- gst_alpha_init_params (alpha);
- break;
- case PROP_NOISE_LEVEL:
- alpha->noise_level = g_value_get_float (value);
- gst_alpha_init_params (alpha);
- break;
- 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;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-static void
-gst_alpha_get_property (GObject * object, guint prop_id, GValue * value,
- GParamSpec * pspec)
-{
- GstAlpha *alpha;
-
- g_return_if_fail (GST_IS_ALPHA (object));
-
- alpha = GST_ALPHA (object);
-
- switch (prop_id) {
- case PROP_METHOD:
- g_value_set_enum (value, alpha->method);
- break;
- case PROP_ALPHA:
- g_value_set_double (value, alpha->alpha);
- break;
- case PROP_TARGET_R:
- g_value_set_uint (value, alpha->target_r);
- break;
- case PROP_TARGET_G:
- g_value_set_uint (value, alpha->target_g);
- break;
- case PROP_TARGET_B:
- g_value_set_uint (value, alpha->target_b);
- break;
- case PROP_ANGLE:
- g_value_set_float (value, alpha->angle);
- break;
- case PROP_NOISE_LEVEL:
- g_value_set_float (value, alpha->noise_level);
- break;
- 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;
- default:
- G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
- break;
- }
-}
-
-static gboolean
-gst_alpha_get_unit_size (GstBaseTransform * btrans,
- GstCaps * caps, guint * size)
-{
- 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);
-
- GST_DEBUG_OBJECT (btrans, "unit size = %d for format %d w %d height %d",
- *size, format, width, height);
-
- return TRUE;
-}
-
-static GstCaps *
-gst_alpha_transform_caps (GstBaseTransform * btrans,
- GstPadDirection direction, GstCaps * caps)
-{
- GstCaps *ret;
- GstStructure *structure;
- gint i;
-
- ret = gst_caps_copy (caps);
-
- /* When going from the SINK pad to the src, we just need to make sure the
- * format is AYUV */
- if (direction == GST_PAD_SINK) {
- for (i = 0; i < gst_caps_get_size (ret); i++) {
- structure = gst_caps_get_structure (ret, i);
- gst_structure_set (structure, "format",
- GST_TYPE_FOURCC, GST_MAKE_FOURCC ('A', 'Y', 'U', 'V'), NULL);
- }
- } else {
- GstCaps *ayuv_caps;
-
- /* In the other direction, prepend a copy of the caps with format AYUV,
- * and set the first to I420 */
- ayuv_caps = gst_caps_copy (ret);
-
- for (i = 0; i < gst_caps_get_size (ret); i++) {
- structure = gst_caps_get_structure (ret, i);
- gst_structure_set (structure, "format",
- GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'), NULL);
- }
-
- gst_caps_append (ret, ayuv_caps);
- }
-
- gst_caps_do_simplify (ret);
-
- return ret;
-}
-
-static gboolean
-gst_alpha_set_caps (GstBaseTransform * btrans,
- GstCaps * incaps, GstCaps * outcaps)
-{
- GstAlpha *alpha = GST_ALPHA (btrans);
-
- if (!gst_video_format_parse_caps (incaps, &alpha->format,
- &alpha->width, &alpha->height))
- return FALSE;
-
- if (alpha->format == GST_VIDEO_FORMAT_AYUV)
- alpha->ayuv = TRUE;
- else
- alpha->ayuv = FALSE;
-
- return TRUE;
-}
-
-static void
-gst_alpha_set_ayuv (guint8 * src, guint8 * dest, gint width, gint height,
- gdouble alpha)
-{
- gint b_alpha = (gint) (alpha * 255);
- gint y, x;
-
- for (y = 0; y < height; y++) {
- for (x = 0; x < width; x++) {
- *dest++ = (*src++ * b_alpha) >> 8;
- *dest++ = *src++;
- *dest++ = *src++;
- *dest++ = *src++;
- }
- }
-}
-
-static void
-gst_alpha_set_i420 (guint8 * src, guint8 * dest, gint width, gint height,
- gdouble alpha)
-{
- gint b_alpha = (gint) (alpha * 255);
- guint8 *srcY;
- guint8 *srcU;
- 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);
-
- for (i = 0; i < height; i++) {
- for (j = 0; j < width / 2; j++) {
- *dest++ = b_alpha;
- *dest++ = *srcY++;
- *dest++ = *srcU;
- *dest++ = *srcV;
- *dest++ = b_alpha;
- *dest++ = *srcY++;
- *dest++ = *srcU++;
- *dest++ = *srcV++;
- }
- /* Might have one odd column left to do */
- if (odd_width) {
- *dest++ = b_alpha;
- *dest++ = *srcY++;
- *dest++ = *srcU;
- *dest++ = *srcV;
- }
- if (i % 2 == 0) {
- srcU -= width / 2;
- srcV -= width / 2;
- } else {
- srcU += src_uv_wrap;
- srcV += src_uv_wrap;
- }
- srcY += src_wrap;
- }
-}
-
-static void
-gst_alpha_chroma_key_ayuv (guint8 * src, guint8 * dest, gint width, gint height,
- GstAlpha * alpha)
-{
- gint b_alpha;
- guint8 *src1;
- guint8 *dest1;
- gint i, j;
- gint x, z, u, v, y, a;
- gint tmp, tmp1;
- gint x1, y1;
- gint smin, smax;
-
- smin = 128 - alpha->black_sensitivity;
- smax = 128 + alpha->white_sensitivity;
-
- src1 = src;
- dest1 = dest;
-
- for (i = 0; i < height; i++) {
- for (j = 0; j < width; j++) {
- a = *src1++ * (alpha->alpha);
- y = *src1++;
- u = *src1++ - 128;
- v = *src1++ - 128;
-
- if (y < smin || y > smax) {
- /* too dark or too bright, keep alpha */
- b_alpha = a;
- } else {
- /* Convert foreground to XZ coords where X direction is defined by
- the key color */
- tmp = ((short) u * alpha->cb + (short) v * alpha->cr) >> 7;
- x = CLAMP (tmp, -128, 127);
- tmp = ((short) v * alpha->cb - (short) u * alpha->cr) >> 7;
- z = CLAMP (tmp, -128, 127);
-
- /* WARNING: accept angle should never be set greater than "somewhat less
- than 90 degrees" to avoid dealing with negative/infinite tg. In reality,
- 80 degrees should be enough if foreground is reasonable. If this seems
- to be a problem, go to alternative ways of checking point position
- (scalar product or line equations). This angle should not be too small
- either to avoid infinite ctg (used to suppress foreground without use of
- division) */
-
- tmp = ((short) (x) * alpha->accept_angle_tg) >> 4;
- tmp = MIN (tmp, 127);
-
- if (abs (z) > tmp) {
- /* keep foreground Kfg = 0 */
- b_alpha = a;
- } else {
- /* Compute Kfg (implicitly) and Kbg, suppress foreground in XZ coord
- according to Kfg */
- tmp = ((short) (z) * alpha->accept_angle_ctg) >> 4;
- tmp = CLAMP (tmp, -128, 127);
- x1 = abs (tmp);
- y1 = z;
-
- tmp1 = x - x1;
- tmp1 = MAX (tmp1, 0);
- b_alpha = (((unsigned char) (tmp1) *
- (unsigned short) (alpha->one_over_kc)) / 2);
- b_alpha = 255 - CLAMP (b_alpha, 0, 255);
- b_alpha = (a * b_alpha) >> 8;
-
- tmp = ((unsigned short) (tmp1) * alpha->kfgy_scale) >> 4;
- tmp1 = MIN (tmp, 255);
-
- tmp = y - tmp1;
- y = MAX (tmp, 0);
-
- /* Convert suppressed foreground back to CbCr */
- tmp = ((char) (x1) * (short) (alpha->cb) -
- (char) (y1) * (short) (alpha->cr)) >> 7;
- u = CLAMP (tmp, -128, 127);
-
- tmp = ((char) (x1) * (short) (alpha->cr) +
- (char) (y1) * (short) (alpha->cb)) >> 7;
- v = CLAMP (tmp, -128, 127);
-
- /* Deal with noise. For now, a circle around the key color with
- radius of noise_level treated as exact key color. Introduces
- sharp transitions.
- */
- tmp = z * (short) (z) + (x - alpha->kg) * (short) (x - alpha->kg);
- tmp = MIN (tmp, 0xffff);
-
- if (tmp < alpha->noise_level * alpha->noise_level) {
- b_alpha = 0;
- }
- }
- }
-
- u += 128;
- v += 128;
-
- *dest1++ = b_alpha;
- *dest1++ = y;
- *dest1++ = u;
- *dest1++ = v;
- }
- }
-}
-
-static void
-gst_alpha_chromakey_row_i420 (GstAlpha * alpha, guint8 * dest1, guint8 * dest2,
- guint8 * srcY1, guint8 * srcY2, guint8 * srcU, guint8 * srcV, gint width)
-{
- gint xpos;
- gint b_alpha;
- gint x, z, u, v, y11, y12, y21, y22, a;
- gint tmp, tmp1;
- gint x1, y1;
- gint smin, smax;
-
- a = 255 * alpha->alpha;
- smin = 128 - alpha->black_sensitivity;
- smax = 128 + alpha->white_sensitivity;
-
- for (xpos = 0; xpos < width / 2; xpos++) {
- y11 = *srcY1++;
- y12 = *srcY1++;
- y21 = *srcY2++;
- y22 = *srcY2++;
- u = *srcU++ - 128;
- v = *srcV++ - 128;
-
- if (y11 < smin || y11 > smax ||
- y12 < smin || y12 > smax ||
- y21 < smin || y21 > smax || y22 < smin || y22 > smax) {
- /* too dark or too bright, make opaque */
- b_alpha = 255;
- } else {
- /* Convert foreground to XZ coords where X direction is defined by
- the key color */
- tmp = ((short) u * alpha->cb + (short) v * alpha->cr) >> 7;
- x = CLAMP (tmp, -128, 127);
- tmp = ((short) v * alpha->cb - (short) u * alpha->cr) >> 7;
- z = CLAMP (tmp, -128, 127);
-
- /* WARNING: accept angle should never be set greater than "somewhat less
- than 90 degrees" to avoid dealing with negative/infinite tg. In reality,
- 80 degrees should be enough if foreground is reasonable. If this seems
- to be a problem, go to alternative ways of checking point position
- (scalar product or line equations). This angle should not be too small
- either to avoid infinite ctg (used to suppress foreground without use of
- division) */
-
- tmp = ((short) (x) * alpha->accept_angle_tg) >> 4;
- tmp = MIN (tmp, 127);
-
- if (abs (z) > tmp) {
- /* keep foreground Kfg = 0 */
- b_alpha = 255;
- } else {
- /* Compute Kfg (implicitly) and Kbg, suppress foreground in XZ coord
- according to Kfg */
- tmp = ((short) (z) * alpha->accept_angle_ctg) >> 4;
- tmp = CLAMP (tmp, -128, 127);
- x1 = abs (tmp);
- y1 = z;
-
- tmp1 = x - x1;
- tmp1 = MAX (tmp1, 0);
- b_alpha = (((unsigned char) (tmp1) *
- (unsigned short) (alpha->one_over_kc)) / 2);
- b_alpha = 255 - CLAMP (b_alpha, 0, 255);
- b_alpha = (a * b_alpha) >> 8;
-
- tmp = ((unsigned short) (tmp1) * alpha->kfgy_scale) >> 4;
- tmp1 = MIN (tmp, 255);
-
- tmp = y11 - tmp1;
- y11 = MAX (tmp, 0);
- tmp = y12 - tmp1;
- y12 = MAX (tmp, 0);
- tmp = y21 - tmp1;
- y21 = MAX (tmp, 0);
- tmp = y22 - tmp1;
- y22 = MAX (tmp, 0);
-
- /* Convert suppressed foreground back to CbCr */
- tmp = ((char) (x1) * (short) (alpha->cb) -
- (char) (y1) * (short) (alpha->cr)) >> 7;
- u = CLAMP (tmp, -128, 127);
-
- tmp = ((char) (x1) * (short) (alpha->cr) +
- (char) (y1) * (short) (alpha->cb)) >> 7;
- v = CLAMP (tmp, -128, 127);
-
- /* Deal with noise. For now, a circle around the key color with
- radius of noise_level treated as exact key color. Introduces
- sharp transitions.
- */
- tmp = z * (short) (z) + (x - alpha->kg) * (short) (x - alpha->kg);
- tmp = MIN (tmp, 0xffff);
-
- if (tmp < alpha->noise_level * alpha->noise_level) {
- /* Uncomment this if you want total suppression within the noise circle */
- b_alpha = 0;
- }
- }
- }
-
- u += 128;
- v += 128;
-
- *dest1++ = b_alpha;
- *dest1++ = y11;
- *dest1++ = u;
- *dest1++ = v;
- *dest1++ = b_alpha;
- *dest1++ = y12;
- *dest1++ = u;
- *dest1++ = v;
-
- *dest2++ = b_alpha;
- *dest2++ = y21;
- *dest2++ = u;
- *dest2++ = v;
- *dest2++ = b_alpha;
- *dest2++ = y22;
- *dest2++ = u;
- *dest2++ = v;
- }
-}
-
-/* based on http://www.cs.utah.edu/~michael/chroma/
- */
-static void
-gst_alpha_chroma_key_i420 (guint8 * src, guint8 * dest, gint width, gint height,
- GstAlpha * alpha)
-{
- 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 (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;
- }
-}
-
-static void
-gst_alpha_init_params (GstAlpha * alpha)
-{
- float kgl;
- float tmp;
- float tmp1, tmp2;
-
- alpha->y =
- 0.257 * alpha->target_r + 0.504 * alpha->target_g +
- 0.098 * alpha->target_b;
- tmp1 =
- -0.148 * alpha->target_r - 0.291 * alpha->target_g +
- 0.439 * alpha->target_b;
- tmp2 =
- 0.439 * alpha->target_r - 0.368 * alpha->target_g -
- 0.071 * alpha->target_b;
- kgl = sqrt (tmp1 * tmp1 + tmp2 * tmp2);
- alpha->cb = 127 * (tmp1 / kgl);
- alpha->cr = 127 * (tmp2 / kgl);
-
- alpha->accept_angle_cos = cos (M_PI * alpha->angle / 180);
- alpha->accept_angle_sin = sin (M_PI * alpha->angle / 180);
- tmp = 15 * tan (M_PI * alpha->angle / 180);
- tmp = MIN (tmp, 255);
- alpha->accept_angle_tg = tmp;
- tmp = 15 / tan (M_PI * alpha->angle / 180);
- tmp = MIN (tmp, 255);
- alpha->accept_angle_ctg = tmp;
- tmp = 1 / (kgl);
- alpha->one_over_kc = 255 * 2 * tmp - 255;
- tmp = 15 * (float) (alpha->y) / kgl;
- tmp = MIN (tmp, 255);
- alpha->kfgy_scale = tmp;
- alpha->kg = MIN (kgl, 127);
-}
-
-static gboolean
-gst_alpha_start (GstBaseTransform * btrans)
-{
- GstAlpha *alpha = GST_ALPHA (btrans);
-
- gst_alpha_init_params (alpha);
-
- return TRUE;
-}
-
-static GstFlowReturn
-gst_alpha_transform (GstBaseTransform * btrans, GstBuffer * in, GstBuffer * out)
-{
- GstAlpha *alpha = GST_ALPHA (btrans);
- gint width, height;
- GstClockTime timestamp;
-
- width = alpha->width;
- height = alpha->height;
-
- GST_BUFFER_TIMESTAMP (out) = GST_BUFFER_TIMESTAMP (in);
- GST_BUFFER_DURATION (out) = GST_BUFFER_DURATION (in);
- timestamp = gst_segment_to_stream_time (&btrans->segment, GST_FORMAT_TIME,
- GST_BUFFER_TIMESTAMP (in));
- GST_LOG ("Got stream time of %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp));
- if (GST_CLOCK_TIME_IS_VALID (timestamp))
- gst_object_sync_values (G_OBJECT (alpha), timestamp);
-
- switch (alpha->method) {
- case ALPHA_METHOD_SET:
- if (alpha->ayuv) {
- gst_alpha_set_ayuv (GST_BUFFER_DATA (in),
- GST_BUFFER_DATA (out), width, height, alpha->alpha);
- } else {
- gst_alpha_set_i420 (GST_BUFFER_DATA (in),
- GST_BUFFER_DATA (out), width, height, alpha->alpha);
- }
- break;
- case ALPHA_METHOD_GREEN:
- case ALPHA_METHOD_BLUE:
- case ALPHA_METHOD_CUSTOM:
- if (alpha->ayuv) {
- gst_alpha_chroma_key_ayuv (GST_BUFFER_DATA (in),
- GST_BUFFER_DATA (out), width, height, alpha);
- } else {
- gst_alpha_chroma_key_i420 (GST_BUFFER_DATA (in),
- GST_BUFFER_DATA (out), width, height, alpha);
- }
- break;
- default:
- break;
- }
-
- return GST_FLOW_OK;
-}
-
-static gboolean
-plugin_init (GstPlugin * plugin)
-{
- gst_controller_init (NULL, NULL);
-
- return gst_element_register (plugin, "alpha", GST_RANK_NONE, GST_TYPE_ALPHA);
-}
-
-GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
- GST_VERSION_MINOR,
- "alpha",
- "adds an alpha channel to video - constant or via chroma-keying",
- plugin_init, VERSION, GST_LICENSE, GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
-
-
-#ifdef __SYMBIAN32__
-EXPORT_C GstPluginDesc* _GST_PLUGIN_DESC()
-{
- return &gst_plugin_desc;
-}
-
-#endif