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/*
* BobWeaver Deinterlacing Filter DSP functions
* Copyright (C) 2016 Thomas Mundt <loudmax@yahoo.de>
*
* Based on YADIF (Yet Another Deinterlacing Filter)
* Copyright (C) 2006-2011 Michael Niedermayer <michaelni@gmx.at>
* 2010 James Darnley <james.darnley@gmail.com>
*
* With use of Weston 3 Field Deinterlacing Filter algorithm
* Copyright (C) 2012 British Broadcasting Corporation, All Rights Reserved
* Author of de-interlace algorithm: Jim Easterbrook for BBC R&D
* Based on the process described by Martin Weston for BBC R&D
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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
*/
#include <stdint.h>
#include <string.h>
#include "config.h"
#include "bwdifdsp.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/macros.h"
/*
* Filter coefficients coef_lf and coef_hf taken from BBC PH-2071 (Weston 3 Field Deinterlacer).
* Used when there is spatial and temporal interpolation.
* Filter coefficients coef_sp are used when there is spatial interpolation only.
* Adjusted for matching visual sharpness impression of spatial and temporal interpolation.
*/
static const uint16_t coef_lf[2] = { 4309, 213 };
static const uint16_t coef_hf[3] = { 5570, 3801, 1016 };
static const uint16_t coef_sp[2] = { 5077, 981 };
#define FILTER_INTRA() \
for (x = 0; x < w; x++) { \
interpol = (coef_sp[0] * (cur[mrefs] + cur[prefs]) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
dst[0] = av_clip(interpol, 0, clip_max); \
\
dst++; \
cur++; \
}
#define FILTER1() \
for (x = 0; x < w; x++) { \
int c = cur[mrefs]; \
int d = (prev2[0] + next2[0]) >> 1; \
int e = cur[prefs]; \
int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e)) >> 1; \
int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e)) >> 1; \
int diff = FFMAX3(temporal_diff0 >> 1, temporal_diff1, temporal_diff2); \
\
if (!diff) { \
dst[0] = d; \
} else {
#define SPAT_CHECK() \
int b = ((prev2[mrefs2] + next2[mrefs2]) >> 1) - c; \
int f = ((prev2[prefs2] + next2[prefs2]) >> 1) - e; \
int dc = d - c; \
int de = d - e; \
int max = FFMAX3(de, dc, FFMIN(b, f)); \
int min = FFMIN3(de, dc, FFMAX(b, f)); \
diff = FFMAX3(diff, min, -max);
#define FILTER_LINE() \
SPAT_CHECK() \
if (FFABS(c - e) > temporal_diff0) { \
interpol = (((coef_hf[0] * (prev2[0] + next2[0]) \
- coef_hf[1] * (prev2[mrefs2] + next2[mrefs2] + prev2[prefs2] + next2[prefs2]) \
+ coef_hf[2] * (prev2[mrefs4] + next2[mrefs4] + prev2[prefs4] + next2[prefs4])) >> 2) \
+ coef_lf[0] * (c + e) - coef_lf[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
} else { \
interpol = (coef_sp[0] * (c + e) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
}
#define FILTER_EDGE() \
if (spat) { \
SPAT_CHECK() \
} \
interpol = (c + e) >> 1;
#define FILTER2() \
if (interpol > d + diff) \
interpol = d + diff; \
else if (interpol < d - diff) \
interpol = d - diff; \
\
dst[0] = av_clip(interpol, 0, clip_max); \
} \
\
dst++; \
cur++; \
prev++; \
next++; \
prev2++; \
next2++; \
}
void ff_bwdif_filter_intra_c(void *dst1, const void *cur1, int w, int prefs, int mrefs,
int prefs3, int mrefs3, int parity, int clip_max)
{
uint8_t *dst = dst1;
const uint8_t *cur = cur1;
int interpol, x;
FILTER_INTRA()
}
void ff_bwdif_filter_line_c(void *dst1, const void *prev1, const void *cur1, const void *next1,
int w, int prefs, int mrefs, int prefs2, int mrefs2,
int prefs3, int mrefs3, int prefs4, int mrefs4,
int parity, int clip_max)
{
uint8_t *dst = dst1;
const uint8_t *prev = prev1;
const uint8_t *cur = cur1;
const uint8_t *next = next1;
const uint8_t *prev2 = parity ? prev : cur ;
const uint8_t *next2 = parity ? cur : next;
int interpol, x;
FILTER1()
FILTER_LINE()
FILTER2()
}
void ff_bwdif_filter_edge_c(void *dst1, const void *prev1, const void *cur1, const void *next1,
int w, int prefs, int mrefs, int prefs2, int mrefs2,
int parity, int clip_max, int spat)
{
uint8_t *dst = dst1;
const uint8_t *prev = prev1;
const uint8_t *cur = cur1;
const uint8_t *next = next1;
const uint8_t *prev2 = parity ? prev : cur ;
const uint8_t *next2 = parity ? cur : next;
int interpol, x;
FILTER1()
FILTER_EDGE()
FILTER2()
}
static void filter_intra_16bit(void *dst1, const void *cur1, int w, int prefs, int mrefs,
int prefs3, int mrefs3, int parity, int clip_max)
{
uint16_t *dst = dst1;
const uint16_t *cur = cur1;
int interpol, x;
FILTER_INTRA()
}
static void filter_line_c_16bit(void *dst1, const void *prev1, const void *cur1, const void *next1,
int w, int prefs, int mrefs, int prefs2, int mrefs2,
int prefs3, int mrefs3, int prefs4, int mrefs4,
int parity, int clip_max)
{
uint16_t *dst = dst1;
const uint16_t *prev = prev1;
const uint16_t *cur = cur1;
const uint16_t *next = next1;
const uint16_t *prev2 = parity ? prev : cur ;
const uint16_t *next2 = parity ? cur : next;
int interpol, x;
FILTER1()
FILTER_LINE()
FILTER2()
}
static void filter_edge_16bit(void *dst1, const void *prev1, const void *cur1, const void *next1,
int w, int prefs, int mrefs, int prefs2, int mrefs2,
int parity, int clip_max, int spat)
{
uint16_t *dst = dst1;
const uint16_t *prev = prev1;
const uint16_t *cur = cur1;
const uint16_t *next = next1;
const uint16_t *prev2 = parity ? prev : cur ;
const uint16_t *next2 = parity ? cur : next;
int interpol, x;
FILTER1()
FILTER_EDGE()
FILTER2()
}
av_cold void ff_bwdif_init_filter_line(BWDIFDSPContext *s, int bit_depth)
{
s->filter_line3 = 0;
if (bit_depth > 8) {
s->filter_intra = filter_intra_16bit;
s->filter_line = filter_line_c_16bit;
s->filter_edge = filter_edge_16bit;
} else {
s->filter_intra = ff_bwdif_filter_intra_c;
s->filter_line = ff_bwdif_filter_line_c;
s->filter_edge = ff_bwdif_filter_edge_c;
}
#if ARCH_X86
ff_bwdif_init_x86(s, bit_depth);
#elif ARCH_AARCH64
ff_bwdif_init_aarch64(s, bit_depth);
#endif
}
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