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315 lines
10 KiB
C
315 lines
10 KiB
C
/*
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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/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 {
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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 {
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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 CHECK_PARAM(param, name, min, max, format, ret) \
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if (param < min || param > max) { \
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av_log(ctx, AV_LOG_ERROR, \
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"Invalid " #name " value " #format ": " \
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"must be included between range " #format " and " #format "\n",\
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param, min, max); \
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ret = AVERROR(EINVAL); \
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}
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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SmartblurContext *sblur = ctx->priv;
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int n = 0, ret = 0;
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float lradius, lstrength, cradius, cstrength;
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int lthreshold, cthreshold;
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if (args)
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n = sscanf(args, "%f:%f:%d:%f:%f:%d",
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&lradius, &lstrength, <hreshold,
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&cradius, &cstrength, &cthreshold);
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if (n != 3 && n != 6) {
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av_log(ctx, AV_LOG_ERROR,
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"Incorrect number of parameters or invalid syntax: "
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"must be luma_radius:luma_strength:luma_threshold"
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"[:chroma_radius:chroma_strength:chroma_threshold]\n");
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return AVERROR(EINVAL);
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}
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sblur->luma.radius = lradius;
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sblur->luma.strength = lstrength;
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sblur->luma.threshold = lthreshold;
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if (n == 3) {
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sblur->chroma.radius = sblur->luma.radius;
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sblur->chroma.strength = sblur->luma.strength;
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sblur->chroma.threshold = sblur->luma.threshold;
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} else {
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sblur->chroma.radius = cradius;
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sblur->chroma.strength = cstrength;
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sblur->chroma.threshold = cthreshold;
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}
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sblur->luma.quality = sblur->chroma.quality = 3.0;
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sblur->sws_flags = SWS_BICUBIC;
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CHECK_PARAM(lradius, luma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
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CHECK_PARAM(lstrength, luma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
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CHECK_PARAM(lthreshold, luma threshold, THRESHOLD_MIN, THRESHOLD_MAX, %d, ret)
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if (n != 3) {
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CHECK_PARAM(sblur->chroma.radius, chroma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret)
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CHECK_PARAM(sblur->chroma.strength, chroma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret)
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CHECK_PARAM(sblur->chroma.threshold, chroma threshold, THRESHOLD_MIN,THRESHOLD_MAX, %d, ret)
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}
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return ret;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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SmartblurContext *sblur = ctx->priv;
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sws_freeContext(sblur->luma.filter_context);
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sws_freeContext(sblur->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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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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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 *sblur = inlink->dst->priv;
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const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
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sblur->hsub = desc->log2_chroma_w;
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sblur->vsub = desc->log2_chroma_h;
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alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->sws_flags);
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alloc_sws_context(&sblur->chroma,
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inlink->w >> sblur->hsub, inlink->h >> sblur->vsub,
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sblur->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 substract '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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/* substract '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 substract '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, AVFilterBufferRef *inpic)
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{
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SmartblurContext *sblur = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFilterBufferRef *outpic;
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int cw = inlink->w >> sblur->hsub;
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int ch = inlink->h >> sblur->vsub;
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outpic = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
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if (!outpic) {
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avfilter_unref_bufferp(&inpic);
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return AVERROR(ENOMEM);
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}
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avfilter_copy_buffer_ref_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, sblur->luma.threshold,
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sblur->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, sblur->chroma.threshold,
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sblur->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, sblur->chroma.threshold,
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sblur->chroma.filter_context);
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}
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avfilter_unref_bufferp(&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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.min_perms = AV_PERM_READ,
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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 avfilter_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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};
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