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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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a5f3d21723
Flesh out the video filter base class. Make it parse the input and output caps and turn them into GstVideoInfo. Map buffers as video frames and pass them to the transform functions. This allows us to also implement the propose and decide_allocation vmethods. Implement the transform size method as well. Update subclasses with the new improvements.
99 lines
2.7 KiB
C
99 lines
2.7 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __GST_VIDEO_SCALE_H__
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#define __GST_VIDEO_SCALE_H__
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#include <gst/gst.h>
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#include <gst/video/video.h>
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#include <gst/video/gstvideofilter.h>
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#include "vs_image.h"
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G_BEGIN_DECLS
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GST_DEBUG_CATEGORY_EXTERN (video_scale_debug);
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#define GST_CAT_DEFAULT video_scale_debug
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#define GST_TYPE_VIDEO_SCALE \
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(gst_video_scale_get_type())
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#define GST_VIDEO_SCALE(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_SCALE,GstVideoScale))
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#define GST_VIDEO_SCALE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_SCALE,GstVideoScaleClass))
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#define GST_IS_VIDEO_SCALE(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_SCALE))
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#define GST_IS_VIDEO_SCALE_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_SCALE))
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#define GST_VIDEO_SCALE_CAST(obj) ((GstVideoScale *)(obj))
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/**
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* GstVideoScaleMethod:
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* @GST_VIDEO_SCALE_NEAREST: use nearest neighbour scaling (fast and ugly)
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* @GST_VIDEO_SCALE_BILINEAR: use bilinear scaling (slower but prettier).
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* @GST_VIDEO_SCALE_4TAP: use a 4-tap filter for scaling (slow).
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* @GST_VIDEO_SCALE_LANCZOS: use a multitap Lanczos filter for scaling (slow).
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*
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* The videoscale method to use.
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*/
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typedef enum {
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GST_VIDEO_SCALE_NEAREST,
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GST_VIDEO_SCALE_BILINEAR,
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GST_VIDEO_SCALE_4TAP,
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GST_VIDEO_SCALE_LANCZOS
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} GstVideoScaleMethod;
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typedef struct _GstVideoScale GstVideoScale;
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typedef struct _GstVideoScaleClass GstVideoScaleClass;
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/**
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* GstVideoScale:
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*
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* Opaque data structure
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*/
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struct _GstVideoScale {
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GstVideoFilter element;
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/* properties */
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GstVideoScaleMethod method;
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gboolean add_borders;
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double sharpness;
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double sharpen;
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gboolean dither;
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int submethod;
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double envelope;
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gint borders_h;
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gint borders_w;
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/*< private >*/
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guint8 *tmp_buf;
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};
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struct _GstVideoScaleClass {
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GstVideoFilterClass parent_class;
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};
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GType gst_video_scale_get_type(void);
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G_END_DECLS
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#endif /* __GST_VIDEO_SCALE_H__ */
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