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/*
* transform.h
*
* Copyright (C) Georg Martius - June 2007
*
* This file is part of transcode, a video stream processing tool
*
* transcode is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* transcode 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Make; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#ifndef __TRANSFORM_H
#define __TRANSFORM_H
#define DEFAULT_TRANS_FILE_NAME "transforms.dat"
/* structure to hold information about frame transformations
x,y are translations, alpha is a rotation around the center in RAD,
zoom is a percentage to zoom in and
extra is for additional information like scene cut (unused)
*/
typedef struct _transform {
double x;
double y;
double alpha;
double zoom;
int extra; /* -1: ignore transform (only internal use);
0 for normal trans; 1 for inter scene cut (unused) */
} Transform;
/* helper functions to create and operate with transforms.
* all functions are non-destructive
* the "_" version uses non-pointer Transforms. This is slower
* but useful when cascading calculations like
* add_transforms_(mult_transform(&t1, 5.0), &t2)
*/
Transform null_transform(void);
Transform new_transform(double x, double y, double alpha,
double zoom, int extra);
Transform add_transforms(const Transform* t1, const Transform* t2);
Transform add_transforms_(const Transform t1, const Transform t2);
Transform sub_transforms(const Transform* t1, const Transform* t2);
Transform mult_transform(const Transform* t1, double f);
Transform mult_transform_(const Transform t1, double f);
/* compares a transform with respect to x (for sort function) */
int cmp_trans_x(const void *t1, const void* t2);
/* compares a transform with respect to y (for sort function) */
int cmp_trans_y(const void *t1, const void* t2);
/* static int cmp_trans_alpha(const void *t1, const void* t2); */
/* compares two double values (for sort function)*/
int cmp_double(const void *t1, const void* t2);
/* calculates the median of an array of transforms,
* considering only x and y
*/
Transform median_xy_transform(const Transform* transforms, int len);
/* median of a double array */
double median(double* ds, int len);
/* mean of a double array */
double mean(const double* ds, int len);
/* mean with cutted upper and lower pentile
* (min and max are optionally returned)
*/
double cleanmean(double* ds, int len, double* minimum, double* maximum);
/* calulcates the cleaned mean of an array of transforms,
* considerung only x and y
*/
Transform cleanmean_xy_transform(const Transform* transforms, int len);
/* calculates the cleaned (cutting of x-th percentil)
* maximum and minimum of an array of transforms,
* considerung only x and y
*/
void cleanmaxmin_xy_transform(const Transform* transforms, int len,
int percentil,
Transform* min, Transform* max);
/* helper functions */
/* optimized round function */
inline static int myround(float x) {
if(x>0)
return x + 0.5;
else
return x - 0.5;
}
/* optimized floor function
This does not give the correct value for negative integer values like -1.0. In this case
it will produce -2.0.
*/
inline static int myfloor(float x) {
if(x<0)
return x - 1;
else
return x;
}
#endif
/*
* Local variables:
* c-file-style: "stroustrup"
* c-file-offsets: ((case-label . *) (statement-case-intro . *))
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/
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