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ad697e8f97
Precompute the rgb -> yuv conversion and color balance adjustment math so that the shader does minimal work per pixel. Merging these 15+ steps into 3 steps let us jump from choppy 360p video to smooth 720p video on our underpowered embedded system. If we can remove the clamp() step inside the shader, or apply it after rgba conversion, there are more performance benefits to reap. But I am not sure what the side effects will be in that case. <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/893> Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/893>
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* GStreamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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_COLOR_BALANCE_H__
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#define __GST_GL_COLOR_BALANCE_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_COLOR_BALANCE \
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(gst_gl_color_balance_get_type())
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#define GST_GL_COLOR_BALANCE(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GL_COLOR_BALANCE,GstGLColorBalance))
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#define GST_GL_COLOR_BALANCE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GL_COLOR_BALANCE,GstGLColorBalanceClass))
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#define GST_IS_GL_COLOR_BALANCE(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GL_COLOR_BALANCE))
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#define GST_IS_GL_COLOR_BALANCE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GL_COLOR_BALANCE))
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typedef struct _GstGLColorBalance GstGLColorBalance;
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typedef struct _GstGLColorBalanceClass GstGLColorBalanceClass;
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/**
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* GstGLColorBalance:
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*
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* Opaque data structure.
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*/
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struct _GstGLColorBalance {
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GstGLFilter videofilter;
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GstGLShader *shader;
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/* channels for interface */
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GList *channels;
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/* cached matrix for speeding up the operations within the shader */
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gfloat yuva_balance_matrix[4*4];
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gfloat yuva_balance_constant[4];
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/* properties */
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gdouble contrast;
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gdouble brightness;
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gdouble hue;
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gdouble saturation;
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};
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struct _GstGLColorBalanceClass {
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GstGLFilterClass parent_class;
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};
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GType gst_gl_color_balance_get_type(void);
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G_END_DECLS
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#endif /* __GST_GL_COLOR_BALANCE_H__ */
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