FFmpeg/libavfilter/interlace.h
Thomas Mundt 2da5bf4c2f avfilter/interlace: add complex vertical low-pass filter
This complex (-1 2 6 2 -1) filter slightly less reduces interlace 'twitter' but better retain detail and subjective sharpness impression compared to the linear (1 2 1) filter.

Signed-off-by: Thomas Mundt <tmundt75@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2017-05-02 14:09:50 -03:00

65 lines
1.8 KiB
C

/*
* This file is part of FFmpeg.
*
* FFmpeg 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 of the License, or
* (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* @file
* progressive to interlaced content filter, inspired by heavy debugging of
* tinterlace filter.
*/
#ifndef AVFILTER_INTERLACE_H
#define AVFILTER_INTERLACE_H
#include "libavutil/common.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
enum ScanMode {
MODE_TFF = 0,
MODE_BFF = 1,
};
enum FieldType {
FIELD_UPPER = 0,
FIELD_LOWER = 1,
};
enum VLPFilter {
VLPF_OFF = 0,
VLPF_LIN = 1,
VLPF_CMP = 2,
};
typedef struct InterlaceContext {
const AVClass *class;
enum ScanMode scan; // top or bottom field first scanning
int lowpass; // enable or disable low pass filtering
AVFrame *cur, *next; // the two frames from which the new one is obtained
void (*lowpass_line)(uint8_t *dstp, ptrdiff_t linesize, const uint8_t *srcp,
ptrdiff_t mref, ptrdiff_t pref);
} InterlaceContext;
void ff_interlace_init_x86(InterlaceContext *interlace);
#endif /* AVFILTER_INTERLACE_H */