/* * Copyright (c) 2002 Michael Niedermayer * Copyright (c) 2012 Jeremy Tran * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with FFmpeg; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /** * @file * Apply a smartblur filter to the input video * Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer. */ #include "libavutil/pixdesc.h" #include "libswscale/swscale.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #define RADIUS_MIN 0.1 #define RADIUS_MAX 5.0 #define STRENGTH_MIN -1.0 #define STRENGTH_MAX 1.0 #define THRESHOLD_MIN -30 #define THRESHOLD_MAX 30 typedef struct { float radius; float strength; int threshold; float quality; struct SwsContext *filter_context; } FilterParam; typedef struct { FilterParam luma; FilterParam chroma; int hsub; int vsub; unsigned int sws_flags; } SmartblurContext; #define CHECK_PARAM(param, name, min, max, format, ret) \ if (param < min || param > max) { \ av_log(ctx, AV_LOG_ERROR, \ "Invalid " #name " value " #format ": " \ "must be included between range " #format " and " #format "\n",\ param, min, max); \ ret = AVERROR(EINVAL); \ } static av_cold int init(AVFilterContext *ctx, const char *args) { SmartblurContext *sblur = ctx->priv; int n = 0, ret = 0; float lradius, lstrength, cradius, cstrength; int lthreshold, cthreshold; if (args) n = sscanf(args, "%f:%f:%d:%f:%f:%d", &lradius, &lstrength, <hreshold, &cradius, &cstrength, &cthreshold); if (n != 3 && n != 6) { av_log(ctx, AV_LOG_ERROR, "Incorrect number of parameters or invalid syntax: " "must be luma_radius:luma_strength:luma_threshold" "[:chroma_radius:chroma_strength:chroma_threshold]\n"); return AVERROR(EINVAL); } sblur->luma.radius = lradius; sblur->luma.strength = lstrength; sblur->luma.threshold = lthreshold; if (n == 3) { sblur->chroma.radius = sblur->luma.radius; sblur->chroma.strength = sblur->luma.strength; sblur->chroma.threshold = sblur->luma.threshold; } else { sblur->chroma.radius = cradius; sblur->chroma.strength = cstrength; sblur->chroma.threshold = cthreshold; } sblur->luma.quality = sblur->chroma.quality = 3.0; sblur->sws_flags = SWS_BICUBIC; CHECK_PARAM(lradius, luma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret) CHECK_PARAM(lstrength, luma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret) CHECK_PARAM(lthreshold, luma threshold, THRESHOLD_MIN, THRESHOLD_MAX, %d, ret) if (n != 3) { CHECK_PARAM(sblur->chroma.radius, chroma radius, RADIUS_MIN, RADIUS_MAX, %0.1f, ret) CHECK_PARAM(sblur->chroma.strength, chroma strength, STRENGTH_MIN, STRENGTH_MAX, %0.1f, ret) CHECK_PARAM(sblur->chroma.threshold, chroma threshold, THRESHOLD_MIN,THRESHOLD_MAX, %d, ret) } return ret; } static av_cold void uninit(AVFilterContext *ctx) { SmartblurContext *sblur = ctx->priv; sws_freeContext(sblur->luma.filter_context); sws_freeContext(sblur->chroma.filter_context); } static int query_formats(AVFilterContext *ctx) { static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }; ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); return 0; } static int alloc_sws_context(FilterParam *f, int width, int height, unsigned int flags) { SwsVector *vec; SwsFilter sws_filter; vec = sws_getGaussianVec(f->radius, f->quality); if (!vec) return AVERROR(EINVAL); sws_scaleVec(vec, f->strength); vec->coeff[vec->length / 2] += 1.0 - f->strength; sws_filter.lumH = sws_filter.lumV = vec; sws_filter.chrH = sws_filter.chrV = NULL; f->filter_context = sws_getCachedContext(NULL, width, height, AV_PIX_FMT_GRAY8, width, height, AV_PIX_FMT_GRAY8, flags, &sws_filter, NULL, NULL); sws_freeVec(vec); if (!f->filter_context) return AVERROR(EINVAL); return 0; } static int config_props(AVFilterLink *inlink) { SmartblurContext *sblur = inlink->dst->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); sblur->hsub = desc->log2_chroma_w; sblur->vsub = desc->log2_chroma_h; alloc_sws_context(&sblur->luma, inlink->w, inlink->h, sblur->sws_flags); alloc_sws_context(&sblur->chroma, inlink->w >> sblur->hsub, inlink->h >> sblur->vsub, sblur->sws_flags); return 0; } static void blur(uint8_t *dst, const int dst_linesize, const uint8_t *src, const int src_linesize, const int w, const int h, const int threshold, struct SwsContext *filter_context) { int x, y; int orig, filtered; int diff; /* Declare arrays of 4 to get aligned data */ const uint8_t* const src_array[4] = {src}; uint8_t *dst_array[4] = {dst}; int src_linesize_array[4] = {src_linesize}; int dst_linesize_array[4] = {dst_linesize}; sws_scale(filter_context, src_array, src_linesize_array, 0, h, dst_array, dst_linesize_array); if (threshold > 0) { for (y = 0; y < h; ++y) { for (x = 0; x < w; ++x) { orig = src[x + y * src_linesize]; filtered = dst[x + y * dst_linesize]; diff = orig - filtered; if (diff > 0) { if (diff > 2 * threshold) dst[x + y * dst_linesize] = orig; else if (diff > threshold) /* add 'diff' and substract 'threshold' from 'filtered' */ dst[x + y * dst_linesize] = orig - threshold; } else { if (-diff > 2 * threshold) dst[x + y * dst_linesize] = orig; else if (-diff > threshold) /* add 'diff' and 'threshold' to 'filtered' */ dst[x + y * dst_linesize] = orig + threshold; } } } } else if (threshold < 0) { for (y = 0; y < h; ++y) { for (x = 0; x < w; ++x) { orig = src[x + y * src_linesize]; filtered = dst[x + y * dst_linesize]; diff = orig - filtered; if (diff > 0) { if (diff <= -threshold) dst[x + y * dst_linesize] = orig; else if (diff <= -2 * threshold) /* substract 'diff' and 'threshold' from 'orig' */ dst[x + y * dst_linesize] = filtered - threshold; } else { if (diff >= threshold) dst[x + y * dst_linesize] = orig; else if (diff >= 2 * threshold) /* add 'threshold' and substract 'diff' from 'orig' */ dst[x + y * dst_linesize] = filtered + threshold; } } } } } static int end_frame(AVFilterLink *inlink) { int ret; SmartblurContext *sblur = inlink->dst->priv; AVFilterBufferRef *inpic = inlink->cur_buf; AVFilterLink *outlink = inlink->dst->outputs[0]; AVFilterBufferRef *outpic = outlink->out_buf; int cw = inlink->w >> sblur->hsub; int ch = inlink->h >> sblur->vsub; blur(outpic->data[0], outpic->linesize[0], inpic->data[0], inpic->linesize[0], inlink->w, inlink->h, sblur->luma.threshold, sblur->luma.filter_context); if (inpic->data[2]) { blur(outpic->data[1], outpic->linesize[1], inpic->data[1], inpic->linesize[1], cw, ch, sblur->chroma.threshold, sblur->chroma.filter_context); blur(outpic->data[2], outpic->linesize[2], inpic->data[2], inpic->linesize[2], cw, ch, sblur->chroma.threshold, sblur->chroma.filter_context); } if ((ret = ff_draw_slice(outlink, 0, outlink->h, 1)) < 0) return ret; return ff_end_frame(outlink); } AVFilter avfilter_vf_smartblur = { .name = "smartblur", .description = NULL_IF_CONFIG_SMALL("Blur the input video without impacting the outlines."), .priv_size = sizeof(SmartblurContext), .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = (const AVFilterPad[]) { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .end_frame = end_frame, .config_props = config_props, .min_perms = AV_PERM_READ, }, { .name = NULL } }, .outputs = (const AVFilterPad[]) { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, }, { .name = NULL } } };