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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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e9297ba3eb
This plugin contains elements for calculating metrics of video streams, intended for objective video codec comparison. At the moment only SSIM metric is implemented (why would you need anything else anyway?). Also contains a helper videomeasure_collector element that collects measurement events and outputs them into a file (to be used with gst-launch). Other metrics may be implemented in the future along with a base class for all measurers. Fixes bug #594321.
140 lines
3.8 KiB
C
140 lines
3.8 KiB
C
/* GStreamer
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* Copyright (C) <2009> LRN <lrn1986 _at_ gmail _dot_ 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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 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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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA
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*/
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#ifndef __GST_SSIM_H__
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#define __GST_SSIM_H__
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#include <gst/gst.h>
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#include <gst/base/gstcollectpads.h>
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#include <gst/video/video.h>
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G_BEGIN_DECLS
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enum
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{
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PROP_0,
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PROP_SSIM_TYPE,
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PROP_WINDOW_TYPE,
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PROP_WINDOW_SIZE,
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PROP_GAUSS_SIGMA,
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};
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#define GST_TYPE_SSIM (gst_ssim_get_type())
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#define GST_SSIM(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), \
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GST_TYPE_SSIM,GstSSim))
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#define GST_IS_SSIM(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), \
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GST_TYPE_SSIM))
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#define GST_SSIM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass) , \
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GST_TYPE_SSIM,GstSSimClass))
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#define GST_IS_SSIM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass) , \
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GST_TYPE_SSIM))
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#define GST_SSIM_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS((obj) , \
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GST_TYPE_SSIM,GstSSimClass))
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typedef struct _GstSSim GstSSim;
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typedef struct _GstSSimClass GstSSimClass;
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typedef struct _GstSSimWindowCache {
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gint x_window_start;
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gint x_weight_start;
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gint x_window_end;
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gint y_window_start;
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gint y_weight_start;
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gint y_window_end;
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gfloat element_summ;
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} GstSSimWindowCache;
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typedef void (*GstSSimFunction) (GstSSim *ssim, guint8 *org, gfloat *orgmu,
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guint8 *mod, guint8 *out, gfloat *mean, gfloat *lowest, gfloat *highest);
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typedef struct _GstSSimOutputContext GstSSimOutputContext;
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/* TODO: check if all fields are used */
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struct _GstSSimOutputContext {
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GstPad *pad;
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gboolean segment_pending;
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};
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/**
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* GstSSim:
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*
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* The ssim object structure.
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*/
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struct _GstSSim {
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GstElement element;
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/* Array of GstSSimOutputContext */
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GPtrArray *src;
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gint padcount;
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GstCollectPads *collect;
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GstPad *orig;
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gint frame_rate;
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gint frame_rate_base;
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gint width;
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gint height;
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GstCaps *sinkcaps;
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GstCaps *srccaps;
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/* SSIM type (0 - canonical; 1 - without mu) */
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gint ssimtype;
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/* Size of a window, windows are square */
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gint windowsize;
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/* Type of a weight-generator. 0 - no weighting. 1 - Gaussian weighting */
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gint windowtype;
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/* Array of width*height GstSSimWindowCaches */
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GstSSimWindowCache *windows;
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/* Array of windowsize*windowsize gfloats */
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gfloat *weights;
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/* For Gaussian function */
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gfloat sigma;
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GstSSimFunction func;
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gfloat const1;
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gfloat const2;
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/* counters to keep track of timestamps */
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gint64 timestamp;
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gint64 offset;
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/* sink event handling */
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GstPadEventFunction collect_event;
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GstSegment segment;
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guint64 segment_position;
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gdouble segment_rate;
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};
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struct _GstSSimClass {
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GstElementClass parent_class;
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};
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GType gst_ssim_get_type (void);
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G_END_DECLS
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#endif /* __GST_SSIM_H__ */
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