340 lines
12 KiB
C
340 lines
12 KiB
C
/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with FFmpeg; if not, write to the Free Software Foundation, Inc.,
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* 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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* Shape Adaptive Blur filter, ported from MPlayer libmpcodecs/vf_sab.c
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*/
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libswscale/swscale.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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typedef struct {
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float radius;
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float pre_filter_radius;
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float strength;
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float quality;
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struct SwsContext *pre_filter_context;
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uint8_t *pre_filter_buf;
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int pre_filter_linesize;
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int dist_width;
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int dist_linesize;
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int *dist_coeff;
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#define COLOR_DIFF_COEFF_SIZE 512
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int color_diff_coeff[COLOR_DIFF_COEFF_SIZE];
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} FilterParam;
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typedef struct {
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const AVClass *class;
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FilterParam luma;
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FilterParam chroma;
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int hsub;
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int vsub;
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unsigned int sws_flags;
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} SabContext;
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static int query_formats(AVFilterContext *ctx)
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{
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static const enum AVPixelFormat pix_fmts[] = {
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AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_YUV410P,
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AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_NONE
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};
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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#define RADIUS_MIN 0.1
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#define RADIUS_MAX 4.0
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#define PRE_FILTER_RADIUS_MIN 0.1
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#define PRE_FILTER_RADIUS_MAX 2.0
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#define STRENGTH_MIN 0.1
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#define STRENGTH_MAX 100.0
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#define OFFSET(x) offsetof(SabContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption sab_options[] = {
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{ "luma_radius", "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
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{ "lr" , "set luma radius", OFFSET(luma.radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
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{ "luma_pre_filter_radius", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
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{ "lpfr", "set luma pre-filter radius", OFFSET(luma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, PRE_FILTER_RADIUS_MIN, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
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{ "luma_strength", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
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{ "ls", "set luma strength", OFFSET(luma.strength), AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
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{ "chroma_radius", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
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{ "cr", "set chroma radius", OFFSET(chroma.radius), AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1}, RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
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{ "chroma_pre_filter_radius", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},
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PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
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{ "cpfr", "set chroma pre-filter radius", OFFSET(chroma.pre_filter_radius), AV_OPT_TYPE_FLOAT, {.dbl=PRE_FILTER_RADIUS_MIN-1},
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PRE_FILTER_RADIUS_MIN-1, PRE_FILTER_RADIUS_MAX, .flags=FLAGS },
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{ "chroma_strength", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
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{ "cs", "set chroma strength", OFFSET(chroma.strength), AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(sab);
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static av_cold int init(AVFilterContext *ctx)
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{
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SabContext *sab = ctx->priv;
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/* make chroma default to luma values, if not explicitly set */
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if (sab->chroma.radius < RADIUS_MIN)
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sab->chroma.radius = sab->luma.radius;
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if (sab->chroma.pre_filter_radius < PRE_FILTER_RADIUS_MIN)
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sab->chroma.pre_filter_radius = sab->luma.pre_filter_radius;
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if (sab->chroma.strength < STRENGTH_MIN)
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sab->chroma.strength = sab->luma.strength;
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sab->luma.quality = sab->chroma.quality = 3.0;
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sab->sws_flags = SWS_POINT;
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av_log(ctx, AV_LOG_VERBOSE,
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"luma_radius:%f luma_pre_filter_radius::%f luma_strength:%f "
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"chroma_radius:%f chroma_pre_filter_radius:%f chroma_strength:%f\n",
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sab->luma .radius, sab->luma .pre_filter_radius, sab->luma .strength,
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sab->chroma.radius, sab->chroma.pre_filter_radius, sab->chroma.strength);
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return 0;
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}
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static void close_filter_param(FilterParam *f)
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{
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if (f->pre_filter_context) {
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sws_freeContext(f->pre_filter_context);
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f->pre_filter_context = NULL;
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}
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av_freep(&f->pre_filter_buf);
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av_freep(&f->dist_coeff);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SabContext *sab = ctx->priv;
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close_filter_param(&sab->luma);
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close_filter_param(&sab->chroma);
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}
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static int open_filter_param(FilterParam *f, int width, int height, unsigned int sws_flags)
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{
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SwsVector *vec;
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SwsFilter sws_f;
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int i, x, y;
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int linesize = FFALIGN(width, 8);
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f->pre_filter_buf = av_malloc(linesize * height);
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if (!f->pre_filter_buf)
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return AVERROR(ENOMEM);
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f->pre_filter_linesize = linesize;
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vec = sws_getGaussianVec(f->pre_filter_radius, f->quality);
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sws_f.lumH = sws_f.lumV = vec;
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sws_f.chrH = sws_f.chrV = NULL;
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f->pre_filter_context = sws_getContext(width, height, AV_PIX_FMT_GRAY8,
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width, height, AV_PIX_FMT_GRAY8,
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sws_flags, &sws_f, NULL, NULL);
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sws_freeVec(vec);
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vec = sws_getGaussianVec(f->strength, 5.0);
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for (i = 0; i < COLOR_DIFF_COEFF_SIZE; i++) {
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double d;
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int index = i-COLOR_DIFF_COEFF_SIZE/2 + vec->length/2;
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if (index < 0 || index >= vec->length) d = 0.0;
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else d = vec->coeff[index];
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f->color_diff_coeff[i] = (int)(d/vec->coeff[vec->length/2]*(1<<12) + 0.5);
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}
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sws_freeVec(vec);
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vec = sws_getGaussianVec(f->radius, f->quality);
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f->dist_width = vec->length;
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f->dist_linesize = FFALIGN(vec->length, 8);
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f->dist_coeff = av_malloc(f->dist_width * f->dist_linesize * sizeof(*f->dist_coeff));
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if (!f->dist_coeff) {
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sws_freeVec(vec);
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return AVERROR(ENOMEM);
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}
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for (y = 0; y < vec->length; y++) {
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for (x = 0; x < vec->length; x++) {
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double d = vec->coeff[x] * vec->coeff[y];
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f->dist_coeff[x + y*f->dist_linesize] = (int)(d*(1<<10) + 0.5);
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}
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}
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sws_freeVec(vec);
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return 0;
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}
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static int config_props(AVFilterLink *inlink)
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{
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SabContext *sab = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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int ret;
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sab->hsub = desc->log2_chroma_w;
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sab->vsub = desc->log2_chroma_h;
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close_filter_param(&sab->luma);
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ret = open_filter_param(&sab->luma, inlink->w, inlink->h, sab->sws_flags);
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if (ret < 0)
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return ret;
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close_filter_param(&sab->chroma);
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ret = open_filter_param(&sab->chroma,
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FF_CEIL_RSHIFT(inlink->w, sab->hsub),
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FF_CEIL_RSHIFT(inlink->h, sab->vsub), sab->sws_flags);
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return ret;
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}
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#define NB_PLANES 4
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static void blur(uint8_t *dst, const int dst_linesize,
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const uint8_t *src, const int src_linesize,
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const int w, const int h, FilterParam *fp)
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{
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int x, y;
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FilterParam f = *fp;
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const int radius = f.dist_width/2;
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const uint8_t * const src2[NB_PLANES] = { src };
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int src2_linesize[NB_PLANES] = { src_linesize };
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uint8_t *dst2[NB_PLANES] = { f.pre_filter_buf };
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int dst2_linesize[NB_PLANES] = { f.pre_filter_linesize };
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sws_scale(f.pre_filter_context, src2, src2_linesize, 0, h, dst2, dst2_linesize);
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#define UPDATE_FACTOR do { \
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int factor; \
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factor = f.color_diff_coeff[COLOR_DIFF_COEFF_SIZE/2 + pre_val - \
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f.pre_filter_buf[ix + iy*f.pre_filter_linesize]] * f.dist_coeff[dx + dy*f.dist_linesize]; \
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sum += src[ix + iy*src_linesize] * factor; \
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div += factor; \
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} while (0)
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for (y = 0; y < h; y++) {
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for (x = 0; x < w; x++) {
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int sum = 0;
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int div = 0;
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int dy;
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const int pre_val = f.pre_filter_buf[x + y*f.pre_filter_linesize];
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if (x >= radius && x < w - radius) {
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for (dy = 0; dy < radius*2 + 1; dy++) {
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int dx;
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int iy = y+dy - radius;
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if (iy < 0) iy = -iy;
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else if (iy >= h) iy = h+h-iy-1;
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for (dx = 0; dx < radius*2 + 1; dx++) {
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const int ix = x+dx - radius;
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UPDATE_FACTOR;
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}
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}
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} else {
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for (dy = 0; dy < radius*2+1; dy++) {
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int dx;
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int iy = y+dy - radius;
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if (iy < 0) iy = -iy;
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else if (iy >= h) iy = h+h-iy-1;
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for (dx = 0; dx < radius*2 + 1; dx++) {
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int ix = x+dx - radius;
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if (ix < 0) ix = -ix;
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else if (ix >= w) ix = w+w-ix-1;
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UPDATE_FACTOR;
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}
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}
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}
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dst[x + y*dst_linesize] = (sum + div/2) / div;
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}
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}
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *inpic)
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{
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SabContext *sab = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *outpic;
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outpic = ff_get_video_buffer(outlink, outlink->w, outlink->h);
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if (!outpic) {
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av_frame_free(&inpic);
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return AVERROR(ENOMEM);
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}
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av_frame_copy_props(outpic, inpic);
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blur(outpic->data[0], outpic->linesize[0], inpic->data[0], inpic->linesize[0],
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inlink->w, inlink->h, &sab->luma);
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if (inpic->data[2]) {
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int cw = FF_CEIL_RSHIFT(inlink->w, sab->hsub);
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int ch = FF_CEIL_RSHIFT(inlink->h, sab->vsub);
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blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, &sab->chroma);
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blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, &sab->chroma);
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}
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av_frame_free(&inpic);
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return ff_filter_frame(outlink, outpic);
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}
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static const AVFilterPad sab_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.filter_frame = filter_frame,
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.config_props = config_props,
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},
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{ NULL }
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};
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static const AVFilterPad sab_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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{ NULL }
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};
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AVFilter avfilter_vf_sab = {
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.name = "sab",
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.description = NULL_IF_CONFIG_SMALL("Apply shape adaptive blur."),
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.priv_size = sizeof(SabContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = sab_inputs,
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.outputs = sab_outputs,
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.priv_class = &sab_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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