mirror of
https://github.com/FFmpeg/FFmpeg.git
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378 lines
12 KiB
C
378 lines
12 KiB
C
/*
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* Copyright (c) 2021 Thilo Borgmann <thilo.borgmann _at_ mail.de>
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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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/**
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* @file
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* No-reference blurdetect filter
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*
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* Implementing:
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* Marziliano, Pina, et al. "A no-reference perceptual blur metric." Proceedings.
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* International conference on image processing. Vol. 3. IEEE, 2002.
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* https://infoscience.epfl.ch/record/111802/files/14%20A%20no-reference%20perceptual%20blur%20metric.pdf
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*
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* @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
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*/
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/qsort.h"
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#include "internal.h"
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#include "edge_common.h"
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static int comp(const float *a,const float *b)
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{
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return FFDIFFSIGN(*a, *b);
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}
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typedef struct BLRContext {
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const AVClass *class;
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int hsub, vsub;
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int nb_planes;
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float low, high;
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uint8_t low_u8, high_u8;
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int radius; // radius during local maxima detection
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int block_pct; // percentage of "sharpest" blocks in the image to use for bluriness calculation
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int block_width; // width for block abbreviation
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int block_height; // height for block abbreviation
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int planes; // number of planes to filter
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double blur_total;
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uint64_t nb_frames;
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float *blks;
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uint8_t *filterbuf;
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uint8_t *tmpbuf;
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uint16_t *gradients;
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int8_t *directions;
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} BLRContext;
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#define OFFSET(x) offsetof(BLRContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption blurdetect_options[] = {
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{ "high", "set high threshold", OFFSET(high), AV_OPT_TYPE_FLOAT, {.dbl=30/255.}, 0, 1, FLAGS },
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{ "low", "set low threshold", OFFSET(low), AV_OPT_TYPE_FLOAT, {.dbl=15/255.}, 0, 1, FLAGS },
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{ "radius", "search radius for maxima detection", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=50}, 1, 100, FLAGS },
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{ "block_pct", "block pooling threshold when calculating blurriness", OFFSET(block_pct), AV_OPT_TYPE_INT, {.i64=80}, 1, 100, FLAGS },
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{ "block_width", "block size for block-based abbreviation of blurriness", OFFSET(block_width), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
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{ "block_height", "block size for block-based abbreviation of blurriness", OFFSET(block_height), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, FLAGS },
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{ "planes", "set planes to filter", OFFSET(planes), AV_OPT_TYPE_INT, {.i64=1}, 0, 15, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(blurdetect);
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static av_cold int blurdetect_init(AVFilterContext *ctx)
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{
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BLRContext *s = ctx->priv;
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s->low_u8 = s->low * 255. + .5;
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s->high_u8 = s->high * 255. + .5;
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return 0;
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}
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static int blurdetect_config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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BLRContext *s = ctx->priv;
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const int bufsize = inlink->w * inlink->h;
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const AVPixFmtDescriptor *pix_desc;
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pix_desc = av_pix_fmt_desc_get(inlink->format);
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s->hsub = pix_desc->log2_chroma_w;
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s->vsub = pix_desc->log2_chroma_h;
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s->nb_planes = av_pix_fmt_count_planes(inlink->format);
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if (s->block_width < 1 || s->block_height < 1) {
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s->block_width = inlink->w;
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s->block_height = inlink->h;
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}
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s->tmpbuf = av_malloc(bufsize);
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s->filterbuf = av_malloc(bufsize);
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s->gradients = av_calloc(bufsize, sizeof(*s->gradients));
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s->directions = av_malloc(bufsize);
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s->blks = av_calloc((inlink->w / s->block_width) * (inlink->h / s->block_height),
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sizeof(*s->blks));
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if (!s->tmpbuf || !s->filterbuf || !s->gradients || !s->directions || !s->blks)
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return AVERROR(ENOMEM);
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return 0;
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}
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// edge width is defined as the distance between surrounding maxima of the edge pixel
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static float edge_width(BLRContext *blr, int i, int j, int8_t dir, int w, int h,
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int edge, const uint8_t *src, int src_linesize)
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{
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float width = 0;
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int dX, dY;
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int sign;
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int tmp;
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int p1;
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int p2;
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int k, x, y;
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int radius = blr->radius;
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switch(dir) {
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case DIRECTION_HORIZONTAL: dX = 1; dY = 0; break;
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case DIRECTION_VERTICAL: dX = 0; dY = 1; break;
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case DIRECTION_45UP: dX = 1; dY = -1; break;
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case DIRECTION_45DOWN: dX = 1; dY = 1; break;
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default: dX = 1; dY = 1; break;
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}
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// determines if search in direction dX/dY is looking for a maximum or minimum
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sign = src[j * src_linesize + i] > src[(j - dY) * src_linesize + i - dX] ? 1 : -1;
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// search in -(dX/dY) direction
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for (k = 0; k < radius; k++) {
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x = i - k*dX;
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y = j - k*dY;
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p1 = y * src_linesize + x;
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x -= dX;
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y -= dY;
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p2 = y * src_linesize + x;
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if (x < 0 || x >= w || y < 0 || y >= h)
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return 0;
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tmp = (src[p1] - src[p2]) * sign;
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if (tmp <= 0) // local maximum found
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break;
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}
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width += k;
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// search in +(dX/dY) direction
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for (k = 0; k < radius; k++) {
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x = i + k * dX;
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y = j + k * dY;
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p1 = y * src_linesize + x;
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x += dX;
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y += dY;
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p2 = y * src_linesize + x;
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if (x < 0 || x >= w || y < 0 || y >= h)
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return 0;
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tmp = (src[p1] - src[p2]) * sign;
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if (tmp >= 0) // local maximum found
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break;
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}
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width += k;
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// for 45 degree directions approximate edge width in pixel units: 0.7 ~= sqrt(2)/2
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if (dir == DIRECTION_45UP || dir == DIRECTION_45DOWN)
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width *= 0.7;
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return width;
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}
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static float calculate_blur(BLRContext *s, int w, int h, int hsub, int vsub,
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int8_t* dir, int dir_linesize,
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uint8_t* dst, int dst_linesize,
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uint8_t* src, int src_linesize)
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{
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float total_width = 0.0;
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int block_count;
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double block_total_width;
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int i, j;
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int blkcnt = 0;
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float *blks = s->blks;
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float block_pool_threshold = s->block_pct / 100.0;
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int block_width = AV_CEIL_RSHIFT(s->block_width, hsub);
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int block_height = AV_CEIL_RSHIFT(s->block_height, vsub);
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int brows = h / block_height;
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int bcols = w / block_width;
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for (int blkj = 0; blkj < brows; blkj++) {
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for (int blki = 0; blki < bcols; blki++) {
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block_total_width = 0.0;
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block_count = 0;
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for (int inj = 0; inj < block_height; inj++) {
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for (int ini = 0; ini < block_width; ini++) {
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i = blki * block_width + ini;
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j = blkj * block_height + inj;
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if (dst[j * dst_linesize + i] > 0) {
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float width = edge_width(s, i, j, dir[j*dir_linesize+i],
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w, h, dst[j*dst_linesize+i],
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src, src_linesize);
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if (width > 0.001) { // throw away zeros
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block_count++;
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block_total_width += width;
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}
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}
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}
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}
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// if not enough edge pixels in a block, consider it smooth
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if (block_total_width >= 2 && block_count) {
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blks[blkcnt] = block_total_width / block_count;
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blkcnt++;
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}
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}
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}
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// simple block pooling by sorting and keeping the sharper blocks
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AV_QSORT(blks, blkcnt, float, comp);
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blkcnt = ceil(blkcnt * block_pool_threshold);
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for (int i = 0; i < blkcnt; i++) {
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total_width += blks[i];
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}
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return total_width / blkcnt;
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}
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static void set_meta(AVDictionary **metadata, const char *key, float d)
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{
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char value[128];
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snprintf(value, sizeof(value), "%f", d);
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av_dict_set(metadata, key, value, 0);
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}
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static int blurdetect_filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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BLRContext *s = ctx->priv;
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AVFilterLink *outlink = ctx->outputs[0];
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const int inw = inlink->w;
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const int inh = inlink->h;
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uint8_t *tmpbuf = s->tmpbuf;
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uint8_t *filterbuf = s->filterbuf;
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uint16_t *gradients = s->gradients;
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int8_t *directions = s->directions;
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float blur = 0.0f;
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int nplanes = 0;
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AVDictionary **metadata;
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metadata = &in->metadata;
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for (int plane = 0; plane < s->nb_planes; plane++) {
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int hsub = plane == 1 || plane == 2 ? s->hsub : 0;
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int vsub = plane == 1 || plane == 2 ? s->vsub : 0;
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int w = AV_CEIL_RSHIFT(inw, hsub);
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int h = AV_CEIL_RSHIFT(inh, vsub);
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if (!((1 << plane) & s->planes))
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continue;
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nplanes++;
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// gaussian filter to reduce noise
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ff_gaussian_blur_8(w, h,
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filterbuf, w,
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in->data[plane], in->linesize[plane], 1);
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// compute the 16-bits gradients and directions for the next step
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ff_sobel_8(w, h, gradients, w, directions, w, filterbuf, w, 1);
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// non_maximum_suppression() will actually keep & clip what's necessary and
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// ignore the rest, so we need a clean output buffer
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memset(tmpbuf, 0, inw * inh);
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ff_non_maximum_suppression(w, h, tmpbuf, w, directions, w, gradients, w);
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// keep high values, or low values surrounded by high values
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ff_double_threshold(s->low_u8, s->high_u8, w, h,
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tmpbuf, w, tmpbuf, w);
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blur += calculate_blur(s, w, h, hsub, vsub, directions, w,
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tmpbuf, w, filterbuf, w);
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}
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if (nplanes)
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blur /= nplanes;
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s->blur_total += blur;
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// write stats
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av_log(ctx, AV_LOG_VERBOSE, "blur: %.7f\n", blur);
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set_meta(metadata, "lavfi.blur", blur);
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s->nb_frames = inlink->frame_count_in;
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return ff_filter_frame(outlink, in);
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}
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static av_cold void blurdetect_uninit(AVFilterContext *ctx)
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{
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BLRContext *s = ctx->priv;
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if (s->nb_frames > 0) {
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av_log(ctx, AV_LOG_INFO, "blur mean: %.7f\n",
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s->blur_total / s->nb_frames);
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}
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av_freep(&s->tmpbuf);
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av_freep(&s->filterbuf);
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av_freep(&s->gradients);
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av_freep(&s->directions);
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av_freep(&s->blks);
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}
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
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AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P,
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AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
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AV_PIX_FMT_NONE
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};
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static const AVFilterPad blurdetect_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = blurdetect_config_input,
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.filter_frame = blurdetect_filter_frame,
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},
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};
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static const AVFilterPad blurdetect_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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};
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const AVFilter ff_vf_blurdetect = {
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.name = "blurdetect",
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.description = NULL_IF_CONFIG_SMALL("Blurdetect filter."),
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.priv_size = sizeof(BLRContext),
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.init = blurdetect_init,
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.uninit = blurdetect_uninit,
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FILTER_PIXFMTS_ARRAY(pix_fmts),
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FILTER_INPUTS(blurdetect_inputs),
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FILTER_OUTPUTS(blurdetect_outputs),
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.priv_class = &blurdetect_class,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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};
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