306 lines
11 KiB
C
306 lines
11 KiB
C
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/*
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* Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2012 Jeremy Tran
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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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* Apply a smartblur filter to the input video
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* Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer.
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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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#define RADIUS_MIN 0.1
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#define RADIUS_MAX 5.0
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#define STRENGTH_MIN -1.0
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#define STRENGTH_MAX 1.0
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#define THRESHOLD_MIN -30
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#define THRESHOLD_MAX 30
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typedef struct FilterParam {
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float radius;
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float strength;
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int threshold;
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float quality;
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struct SwsContext *filter_context;
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} FilterParam;
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typedef struct SmartblurContext {
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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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} SmartblurContext;
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#define OFFSET(x) offsetof(SmartblurContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption smartblur_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_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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{ "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS },
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{ "lt", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT, {.i64=0}, THRESHOLD_MIN, THRESHOLD_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_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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{ "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
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{ "ct", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT, {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(smartblur);
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static av_cold int init(AVFilterContext *ctx)
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{
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SmartblurContext *s = ctx->priv;
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/* make chroma default to luma values, if not explicitly set */
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if (s->chroma.radius < RADIUS_MIN)
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s->chroma.radius = s->luma.radius;
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if (s->chroma.strength < STRENGTH_MIN)
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s->chroma.strength = s->luma.strength;
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if (s->chroma.threshold < THRESHOLD_MIN)
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s->chroma.threshold = s->luma.threshold;
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s->luma.quality = s->chroma.quality = 3.0;
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s->sws_flags = SWS_BICUBIC;
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av_log(ctx, AV_LOG_VERBOSE,
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"luma_radius:%f luma_strength:%f luma_threshold:%d "
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"chroma_radius:%f chroma_strength:%f chroma_threshold:%d\n",
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s->luma.radius, s->luma.strength, s->luma.threshold,
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s->chroma.radius, s->chroma.strength, s->chroma.threshold);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SmartblurContext *s = ctx->priv;
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sws_freeContext(s->luma.filter_context);
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sws_freeContext(s->chroma.filter_context);
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}
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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_YUV444P, AV_PIX_FMT_YUV422P,
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P,
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
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if (!fmts_list)
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return AVERROR(ENOMEM);
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return ff_set_common_formats(ctx, fmts_list);
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}
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static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags)
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{
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SwsVector *vec;
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SwsFilter sws_filter;
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vec = sws_getGaussianVec(f->radius, f->quality);
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if (!vec)
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return AVERROR(EINVAL);
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sws_scaleVec(vec, f->strength);
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vec->coeff[vec->length / 2] += 1.0 - f->strength;
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sws_filter.lumH = sws_filter.lumV = vec;
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sws_filter.chrH = sws_filter.chrV = NULL;
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f->filter_context = sws_getCachedContext(NULL,
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width, height, AV_PIX_FMT_GRAY8,
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width, height, AV_PIX_FMT_GRAY8,
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flags, &sws_filter, NULL, NULL);
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sws_freeVec(vec);
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if (!f->filter_context)
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return AVERROR(EINVAL);
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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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SmartblurContext *s = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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s->hsub = desc->log2_chroma_w;
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s->vsub = desc->log2_chroma_h;
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alloc_sws_context(&s->luma, inlink->w, inlink->h, s->sws_flags);
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alloc_sws_context(&s->chroma,
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AV_CEIL_RSHIFT(inlink->w, s->hsub),
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AV_CEIL_RSHIFT(inlink->h, s->vsub),
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s->sws_flags);
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return 0;
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}
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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, const int threshold,
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struct SwsContext *filter_context)
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{
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int x, y;
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int orig, filtered;
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int diff;
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/* Declare arrays of 4 to get aligned data */
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const uint8_t* const src_array[4] = {src};
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uint8_t *dst_array[4] = {dst};
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int src_linesize_array[4] = {src_linesize};
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int dst_linesize_array[4] = {dst_linesize};
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sws_scale(filter_context, src_array, src_linesize_array,
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0, h, dst_array, dst_linesize_array);
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if (threshold > 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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orig = src[x + y * src_linesize];
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filtered = dst[x + y * dst_linesize];
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diff = orig - filtered;
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if (diff > 0) {
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if (diff > 2 * threshold)
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dst[x + y * dst_linesize] = orig;
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else if (diff > threshold)
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/* add 'diff' and subtract 'threshold' from 'filtered' */
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dst[x + y * dst_linesize] = orig - threshold;
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} else {
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if (-diff > 2 * threshold)
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dst[x + y * dst_linesize] = orig;
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else if (-diff > threshold)
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/* add 'diff' and 'threshold' to 'filtered' */
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dst[x + y * dst_linesize] = orig + threshold;
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}
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}
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}
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} else if (threshold < 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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orig = src[x + y * src_linesize];
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filtered = dst[x + y * dst_linesize];
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diff = orig - filtered;
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if (diff > 0) {
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if (diff <= -threshold)
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dst[x + y * dst_linesize] = orig;
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else if (diff <= -2 * threshold)
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/* subtract 'diff' and 'threshold' from 'orig' */
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dst[x + y * dst_linesize] = filtered - threshold;
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} else {
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if (diff >= threshold)
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dst[x + y * dst_linesize] = orig;
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else if (diff >= 2 * threshold)
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/* add 'threshold' and subtract 'diff' from 'orig' */
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dst[x + y * dst_linesize] = filtered + threshold;
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}
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}
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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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SmartblurContext *s = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *outpic;
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int cw = AV_CEIL_RSHIFT(inlink->w, s->hsub);
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int ch = AV_CEIL_RSHIFT(inlink->h, s->vsub);
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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],
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inpic->data[0], inpic->linesize[0],
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inlink->w, inlink->h, s->luma.threshold,
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s->luma.filter_context);
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if (inpic->data[2]) {
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blur(outpic->data[1], outpic->linesize[1],
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inpic->data[1], inpic->linesize[1],
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cw, ch, s->chroma.threshold,
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s->chroma.filter_context);
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blur(outpic->data[2], outpic->linesize[2],
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inpic->data[2], inpic->linesize[2],
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cw, ch, s->chroma.threshold,
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s->chroma.filter_context);
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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 smartblur_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 smartblur_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 ff_vf_smartblur = {
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.name = "smartblur",
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.description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."),
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.priv_size = sizeof(SmartblurContext),
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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 = smartblur_inputs,
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.outputs = smartblur_outputs,
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.priv_class = &smartblur_class,
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
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};
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