mirror of https://github.com/FFmpeg/FFmpeg.git
This is a port of the MPlayer smartblur filter (libmpcodecs/vf_smartblur.c) by Michael Niedermayer. Signed-off-by: Stefano Sabatini <stefasab@gmail.com>pull/28/head
Jérémy Tran
13 years ago
committed by
Stefano Sabatini
parent
18217bb0f5
commit
316afee708
7 changed files with 339 additions and 2 deletions
@ -0,0 +1,303 @@ |
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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/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 PixelFormat pix_fmts[] = { |
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PIX_FMT_YUV444P, PIX_FMT_YUV422P, |
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PIX_FMT_YUV420P, PIX_FMT_YUV411P, |
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PIX_FMT_YUV410P, PIX_FMT_YUV440P, |
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PIX_FMT_GRAY8, |
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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, PIX_FMT_GRAY8, |
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width, height, 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_descriptors[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 end_frame(AVFilterLink *inlink) |
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{ |
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SmartblurContext *sblur = inlink->dst->priv; |
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AVFilterBufferRef *inpic = inlink->cur_buf; |
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AVFilterBufferRef *outpic = inlink->dst->outputs[0]->out_buf; |
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int cw = inlink->w >> sblur->hsub; |
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int ch = inlink->h >> sblur->vsub; |
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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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return ff_end_frame(inlink->dst->outputs[0]); |
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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 = (const AVFilterPad[]) { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.end_frame = end_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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{ .name = NULL } |
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}, |
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.outputs = (const AVFilterPad[]) { |
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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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{ .name = NULL } |
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} |
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}; |
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