mirror of
https://github.com/FFmpeg/FFmpeg.git
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295 lines
9.8 KiB
C
295 lines
9.8 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 blockdetect filter
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*
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* Implementing:
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* Remco Muijs and Ihor Kirenko: "A no-reference blocking artifact measure for adaptive video processing." 2005 13th European signal processing conference. IEEE, 2005.
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* http://www.eurasip.org/Proceedings/Eusipco/Eusipco2005/defevent/papers/cr1042.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 "internal.h"
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typedef struct BLKContext {
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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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int period_min; // minimum period to search for
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int period_max; // maximum period to search for
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int planes; // number of planes to filter
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double block_total;
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uint64_t nb_frames;
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float *gradients;
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} BLKContext;
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#define OFFSET(x) offsetof(BLKContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption blockdetect_options[] = {
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{ "period_min", "Minimum period to search for", OFFSET(period_min), AV_OPT_TYPE_INT, {.i64=3}, 2, 32, FLAGS},
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{ "period_max", "Maximum period to search for", OFFSET(period_max), AV_OPT_TYPE_INT, {.i64=24}, 2, 64, 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(blockdetect);
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static av_cold int blockdetect_init(AVFilterContext *ctx)
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{
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return 0;
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}
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static int blockdetect_config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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BLKContext *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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s->gradients = av_calloc(bufsize, sizeof(*s->gradients));
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if (!s->gradients)
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return AVERROR(ENOMEM);
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return 0;
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}
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static float calculate_blockiness(BLKContext *s, int w, int h,
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float *grad, int grad_linesize,
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uint8_t* src, int src_linesize)
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{
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float block = 0.0f;
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float nonblock = 0.0f;
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int block_count = 0;
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int nonblock_count = 0;
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float ret = 0;
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// Calculate BS in horizontal and vertical directions according to (1)(2)(3).
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// Also try to find integer pixel periods (grids) even for scaled images.
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// In case of fractional periods, FFMAX of current and neighbor pixels
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// can help improve the correlation with MQS.
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// Skip linear correction term (4)(5), as it appears only valid for their own test samples.
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// horizontal blockiness (fixed width)
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for (int j = 1; j < h; j++) {
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for (int i = 3; i < w - 4; i++) {
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float temp = 0.0f;
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grad[j * grad_linesize + i] =
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abs(src[j * src_linesize + i + 0] - src[j * src_linesize + i + 1]);
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temp += abs(src[j * src_linesize + i + 1] - src[j * src_linesize + i + 2]);
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temp += abs(src[j * src_linesize + i + 2] - src[j * src_linesize + i + 3]);
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temp += abs(src[j * src_linesize + i + 3] - src[j * src_linesize + i + 4]);
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temp += abs(src[j * src_linesize + i - 0] - src[j * src_linesize + i - 1]);
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temp += abs(src[j * src_linesize + i - 1] - src[j * src_linesize + i - 2]);
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temp += abs(src[j * src_linesize + i - 2] - src[j * src_linesize + i - 3]);
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temp = FFMAX(1, temp);
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grad[j * grad_linesize + i] /= temp;
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// use first row to store acculated results
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grad[i] += grad[j * grad_linesize + i];
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}
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}
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// find horizontal period
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for (int period = s->period_min; period < s->period_max + 1; period++) {
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float temp;
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block = 0;
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nonblock = 0;
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block_count = 0;
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nonblock_count = 0;
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for (int i = 3; i < w - 4; i++) {
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if ((i % period) == (period - 1)) {
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block += FFMAX(FFMAX(grad[i + 0], grad[i + 1]), grad[i - 1]);
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block_count++;
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} else {
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nonblock += grad[i];
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nonblock_count++;
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}
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}
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temp = (block / block_count) / (nonblock / nonblock_count);
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ret = FFMAX(ret, temp);
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}
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// vertical blockiness (fixed height)
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block_count = 0;
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for (int j = 3; j < h - 4; j++) {
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for (int i = 1; i < w; i++) {
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float temp = 0.0f;
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grad[j * grad_linesize + i] =
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abs(src[(j + 0) * src_linesize + i] - src[(j + 1) * src_linesize + i]);
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temp += abs(src[(j + 1) * src_linesize + i] - src[(j + 2) * src_linesize + i]);
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temp += abs(src[(j + 2) * src_linesize + i] - src[(j + 3) * src_linesize + i]);
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temp += abs(src[(j + 3) * src_linesize + i] - src[(j + 4) * src_linesize + i]);
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temp += abs(src[(j - 0) * src_linesize + i] - src[(j - 1) * src_linesize + i]);
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temp += abs(src[(j - 1) * src_linesize + i] - src[(j - 2) * src_linesize + i]);
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temp += abs(src[(j - 2) * src_linesize + i] - src[(j - 3) * src_linesize + i]);
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temp = FFMAX(1, temp);
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grad[j * grad_linesize + i] /= temp;
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// use first column to store accumulated results
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grad[j * grad_linesize] += grad[j * grad_linesize + i];
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}
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}
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// find vertical period
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for (int period = s->period_min; period < s->period_max + 1; period++) {
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float temp;
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block = 0;
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nonblock = 0;
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block_count = 0;
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nonblock_count = 0;
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for (int j = 3; j < h - 4; j++) {
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if ((j % period) == (period - 1)) {
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block += FFMAX(FFMAX(grad[(j + 0) * grad_linesize],
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grad[(j + 1) * grad_linesize]),
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grad[(j - 1) * grad_linesize]);
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block_count++;
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} else {
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nonblock += grad[j * grad_linesize];
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nonblock_count++;
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}
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}
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temp = (block / block_count) / (nonblock / nonblock_count);
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ret = FFMAX(ret, temp);
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}
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// return highest value of horz||vert
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return ret;
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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 blockdetect_filter_frame(AVFilterLink *inlink, AVFrame *in)
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{
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AVFilterContext *ctx = inlink->dst;
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BLKContext *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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float *gradients = s->gradients;
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float block = 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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block += calculate_blockiness(s, w, h, gradients, w, in->data[plane], in->linesize[plane]);
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}
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if (nplanes)
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block /= nplanes;
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s->block_total += block;
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// write stats
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av_log(ctx, AV_LOG_VERBOSE, "block: %.7f\n", block);
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set_meta(metadata, "lavfi.block", block);
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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 blockdetect_uninit(AVFilterContext *ctx)
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{
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BLKContext *s = ctx->priv;
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if (s->nb_frames > 0) {
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av_log(ctx, AV_LOG_INFO, "block mean: %.7f\n",
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s->block_total / s->nb_frames);
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}
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av_freep(&s->gradients);
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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 blockdetect_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 = blockdetect_config_input,
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.filter_frame = blockdetect_filter_frame,
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},
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};
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static const AVFilterPad blockdetect_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_blockdetect = {
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.name = "blockdetect",
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.description = NULL_IF_CONFIG_SMALL("Blockdetect filter."),
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.priv_size = sizeof(BLKContext),
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.init = blockdetect_init,
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.uninit = blockdetect_uninit,
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FILTER_PIXFMTS_ARRAY(pix_fmts),
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FILTER_INPUTS(blockdetect_inputs),
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FILTER_OUTPUTS(blockdetect_outputs),
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.priv_class = &blockdetect_class,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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};
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