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af5b0ee7d0
It performs similarly to the existing alpha element however performs calculations in floating point rather than with small (guint8) integers so some differences are to be expected. https://bugzilla.gnome.org/show_bug.cgi?id=794070
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/* GStreamer
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* Copyright (C) 2018 Matthew Waters <matthew@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_GL_ALPHA_H__
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#define __GST_GL_ALPHA_H__
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <gst/gl/gl.h>
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G_BEGIN_DECLS
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#define GST_TYPE_GL_ALPHA \
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(gst_gl_alpha_get_type())
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#define GST_GL_ALPHA(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_ALPHA,GstGLAlpha))
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#define GST_GL_ALPHA_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_ALPHA,GstGLAlphaClass))
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#define GST_IS_GL_ALPHA(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_ALPHA))
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#define GST_IS_GL_ALPHA_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_ALPHA))
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typedef struct _GstGLAlpha GstGLAlpha;
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typedef struct _GstGLAlphaClass GstGLAlphaClass;
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/**
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* GstGLAlphaMethod:
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* @ALPHA_METHOD_SET: Set/adjust alpha channel
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* @ALPHA_METHOD_GREEN: Chroma Key green
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* @ALPHA_METHOD_BLUE: Chroma Key blue
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* @ALPHA_METHOD_CUSTOM: Chroma Key on target_r/g/b
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*/
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typedef enum
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{
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ALPHA_METHOD_SET,
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ALPHA_METHOD_GREEN,
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ALPHA_METHOD_BLUE,
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ALPHA_METHOD_CUSTOM,
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}
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GstGLAlphaMethod;
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/**
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* GstGLAlpha:
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*
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* Opaque data structure.
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*/
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struct _GstGLAlpha {
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GstGLFilter videofilter;
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/* < private > */
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GstGLShader *alpha_shader;
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GstGLShader *chroma_key_shader;
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/* properties */
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gdouble alpha;
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guint target_r;
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guint target_g;
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guint target_b;
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GstGLAlphaMethod method;
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gfloat angle;
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gfloat noise_level;
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guint black_sensitivity;
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guint white_sensitivity;
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/* precalculated values for chroma keying */
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gfloat cb, cr;
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gfloat kg;
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gfloat accept_angle_tg;
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gfloat accept_angle_ctg;
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gfloat one_over_kc;
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gfloat kfgy_scale;
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gfloat noise_level2;
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};
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struct _GstGLAlphaClass {
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GstGLFilterClass parent_class;
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};
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GType gst_gl_alpha_get_type(void);
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G_END_DECLS
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#endif /* __GST_GL_ALPHA_H__ */
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