gstreamer/subprojects/gst-plugins-base/ext/gl/gstglalpha.h

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/* GStreamer
* Copyright (C) 2018 Matthew Waters <matthew@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_GL_ALPHA_H__
#define __GST_GL_ALPHA_H__
#include <gst/gst.h>
#include <gst/video/video.h>
#include <gst/gl/gl.h>
G_BEGIN_DECLS
#define GST_TYPE_GL_ALPHA \
(gst_gl_alpha_get_type())
#define GST_GL_ALPHA(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_ALPHA,GstGLAlpha))
#define GST_GL_ALPHA_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_ALPHA,GstGLAlphaClass))
#define GST_IS_GL_ALPHA(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_ALPHA))
#define GST_IS_GL_ALPHA_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_ALPHA))
typedef struct _GstGLAlpha GstGLAlpha;
typedef struct _GstGLAlphaClass GstGLAlphaClass;
/**
* GstGLAlphaMethod:
* @ALPHA_METHOD_SET: Set/adjust alpha channel
* @ALPHA_METHOD_GREEN: Chroma Key green
* @ALPHA_METHOD_BLUE: Chroma Key blue
* @ALPHA_METHOD_CUSTOM: Chroma Key on target_r/g/b
*/
typedef enum
{
ALPHA_METHOD_SET,
ALPHA_METHOD_GREEN,
ALPHA_METHOD_BLUE,
ALPHA_METHOD_CUSTOM,
}
GstGLAlphaMethod;
/**
* GstGLAlpha:
*
* Opaque data structure.
*/
struct _GstGLAlpha {
GstGLFilter videofilter;
GstGLShader *alpha_shader;
GstGLShader *chroma_key_shader;
/* properties */
gdouble alpha;
guint target_r;
guint target_g;
guint target_b;
GstGLAlphaMethod method;
gfloat angle;
gfloat noise_level;
guint black_sensitivity;
guint white_sensitivity;
/* precalculated values for chroma keying */
gfloat cb, cr;
gfloat kg;
gfloat accept_angle_tg;
gfloat accept_angle_ctg;
gfloat one_over_kc;
gfloat kfgy_scale;
gfloat noise_level2;
};
struct _GstGLAlphaClass {
GstGLFilterClass parent_class;
};
GType gst_gl_alpha_get_type(void);
G_END_DECLS
#endif /* __GST_GL_ALPHA_H__ */