mirror of https://git.videolan.org/git/ffmpeg.git
227 lines
7.5 KiB
C
227 lines
7.5 KiB
C
/*
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* BobWeaver Deinterlacing Filter DSP functions
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* Copyright (C) 2016 Thomas Mundt <loudmax@yahoo.de>
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*
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* Based on YADIF (Yet Another Deinterlacing Filter)
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* Copyright (C) 2006-2011 Michael Niedermayer <michaelni@gmx.at>
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* 2010 James Darnley <james.darnley@gmail.com>
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*
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* With use of Weston 3 Field Deinterlacing Filter algorithm
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* Copyright (C) 2012 British Broadcasting Corporation, All Rights Reserved
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* Author of de-interlace algorithm: Jim Easterbrook for BBC R&D
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* Based on the process described by Martin Weston for BBC R&D
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <string.h>
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#include "config.h"
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#include "bwdifdsp.h"
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "libavutil/macros.h"
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/*
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* Filter coefficients coef_lf and coef_hf taken from BBC PH-2071 (Weston 3 Field Deinterlacer).
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* Used when there is spatial and temporal interpolation.
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* Filter coefficients coef_sp are used when there is spatial interpolation only.
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* Adjusted for matching visual sharpness impression of spatial and temporal interpolation.
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*/
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static const uint16_t coef_lf[2] = { 4309, 213 };
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static const uint16_t coef_hf[3] = { 5570, 3801, 1016 };
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static const uint16_t coef_sp[2] = { 5077, 981 };
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#define FILTER_INTRA() \
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for (x = 0; x < w; x++) { \
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interpol = (coef_sp[0] * (cur[mrefs] + cur[prefs]) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
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dst[0] = av_clip(interpol, 0, clip_max); \
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\
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dst++; \
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cur++; \
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}
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#define FILTER1() \
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for (x = 0; x < w; x++) { \
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int c = cur[mrefs]; \
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int d = (prev2[0] + next2[0]) >> 1; \
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int e = cur[prefs]; \
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int temporal_diff0 = FFABS(prev2[0] - next2[0]); \
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int temporal_diff1 =(FFABS(prev[mrefs] - c) + FFABS(prev[prefs] - e)) >> 1; \
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int temporal_diff2 =(FFABS(next[mrefs] - c) + FFABS(next[prefs] - e)) >> 1; \
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int diff = FFMAX3(temporal_diff0 >> 1, temporal_diff1, temporal_diff2); \
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\
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if (!diff) { \
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dst[0] = d; \
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} else {
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#define SPAT_CHECK() \
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int b = ((prev2[mrefs2] + next2[mrefs2]) >> 1) - c; \
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int f = ((prev2[prefs2] + next2[prefs2]) >> 1) - e; \
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int dc = d - c; \
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int de = d - e; \
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int max = FFMAX3(de, dc, FFMIN(b, f)); \
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int min = FFMIN3(de, dc, FFMAX(b, f)); \
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diff = FFMAX3(diff, min, -max);
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#define FILTER_LINE() \
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SPAT_CHECK() \
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if (FFABS(c - e) > temporal_diff0) { \
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interpol = (((coef_hf[0] * (prev2[0] + next2[0]) \
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- coef_hf[1] * (prev2[mrefs2] + next2[mrefs2] + prev2[prefs2] + next2[prefs2]) \
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+ coef_hf[2] * (prev2[mrefs4] + next2[mrefs4] + prev2[prefs4] + next2[prefs4])) >> 2) \
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+ coef_lf[0] * (c + e) - coef_lf[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
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} else { \
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interpol = (coef_sp[0] * (c + e) - coef_sp[1] * (cur[mrefs3] + cur[prefs3])) >> 13; \
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}
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#define FILTER_EDGE() \
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if (spat) { \
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SPAT_CHECK() \
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} \
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interpol = (c + e) >> 1;
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#define FILTER2() \
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if (interpol > d + diff) \
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interpol = d + diff; \
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else if (interpol < d - diff) \
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interpol = d - diff; \
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\
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dst[0] = av_clip(interpol, 0, clip_max); \
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} \
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\
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dst++; \
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cur++; \
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prev++; \
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next++; \
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prev2++; \
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next2++; \
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}
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void ff_bwdif_filter_intra_c(void *dst1, const void *cur1, int w, int prefs, int mrefs,
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int prefs3, int mrefs3, int parity, int clip_max)
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{
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uint8_t *dst = dst1;
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const uint8_t *cur = cur1;
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int interpol, x;
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FILTER_INTRA()
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}
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void ff_bwdif_filter_line_c(void *dst1, const void *prev1, const void *cur1, const void *next1,
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int w, int prefs, int mrefs, int prefs2, int mrefs2,
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int prefs3, int mrefs3, int prefs4, int mrefs4,
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int parity, int clip_max)
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{
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uint8_t *dst = dst1;
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const uint8_t *prev = prev1;
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const uint8_t *cur = cur1;
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const uint8_t *next = next1;
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const uint8_t *prev2 = parity ? prev : cur ;
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const uint8_t *next2 = parity ? cur : next;
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int interpol, x;
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FILTER1()
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FILTER_LINE()
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FILTER2()
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}
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void ff_bwdif_filter_edge_c(void *dst1, const void *prev1, const void *cur1, const void *next1,
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int w, int prefs, int mrefs, int prefs2, int mrefs2,
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int parity, int clip_max, int spat)
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{
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uint8_t *dst = dst1;
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const uint8_t *prev = prev1;
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const uint8_t *cur = cur1;
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const uint8_t *next = next1;
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const uint8_t *prev2 = parity ? prev : cur ;
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const uint8_t *next2 = parity ? cur : next;
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int interpol, x;
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FILTER1()
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FILTER_EDGE()
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FILTER2()
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}
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static void filter_intra_16bit(void *dst1, const void *cur1, int w, int prefs, int mrefs,
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int prefs3, int mrefs3, int parity, int clip_max)
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{
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uint16_t *dst = dst1;
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const uint16_t *cur = cur1;
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int interpol, x;
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FILTER_INTRA()
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}
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static void filter_line_c_16bit(void *dst1, const void *prev1, const void *cur1, const void *next1,
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int w, int prefs, int mrefs, int prefs2, int mrefs2,
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int prefs3, int mrefs3, int prefs4, int mrefs4,
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int parity, int clip_max)
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{
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uint16_t *dst = dst1;
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const uint16_t *prev = prev1;
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const uint16_t *cur = cur1;
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const uint16_t *next = next1;
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const uint16_t *prev2 = parity ? prev : cur ;
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const uint16_t *next2 = parity ? cur : next;
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int interpol, x;
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FILTER1()
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FILTER_LINE()
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FILTER2()
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}
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static void filter_edge_16bit(void *dst1, const void *prev1, const void *cur1, const void *next1,
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int w, int prefs, int mrefs, int prefs2, int mrefs2,
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int parity, int clip_max, int spat)
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{
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uint16_t *dst = dst1;
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const uint16_t *prev = prev1;
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const uint16_t *cur = cur1;
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const uint16_t *next = next1;
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const uint16_t *prev2 = parity ? prev : cur ;
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const uint16_t *next2 = parity ? cur : next;
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int interpol, x;
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FILTER1()
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FILTER_EDGE()
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FILTER2()
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}
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av_cold void ff_bwdif_init_filter_line(BWDIFDSPContext *s, int bit_depth)
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{
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s->filter_line3 = 0;
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if (bit_depth > 8) {
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s->filter_intra = filter_intra_16bit;
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s->filter_line = filter_line_c_16bit;
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s->filter_edge = filter_edge_16bit;
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} else {
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s->filter_intra = ff_bwdif_filter_intra_c;
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s->filter_line = ff_bwdif_filter_line_c;
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s->filter_edge = ff_bwdif_filter_edge_c;
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}
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#if ARCH_X86
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ff_bwdif_init_x86(s, bit_depth);
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#elif ARCH_AARCH64
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ff_bwdif_init_aarch64(s, bit_depth);
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#endif
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}
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