mirror of https://github.com/FFmpeg/FFmpeg.git
Clément Bœsch
12 years ago
parent
48de04f4ec
commit
7b43120c7c
7 changed files with 489 additions and 1 deletions
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/*
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* Copyright (c) 2013 Clément Bœsch |
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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 |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (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 GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* A simple, relatively efficient and extremely slow DCT image denoiser. |
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* @see http://www.ipol.im/pub/art/2011/ys-dct/
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*/ |
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#include "libavcodec/avfft.h" |
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#include "libavutil/eval.h" |
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#include "libavutil/opt.h" |
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#include "drawutils.h" |
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#include "internal.h" |
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#define NBITS 4 |
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#define BSIZE (1<<(NBITS)) |
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static const char *const var_names[] = { "c", NULL }; |
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enum { VAR_C, VAR_VARS_NB }; |
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typedef struct { |
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const AVClass *class; |
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/* coefficient factor expression */ |
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char *expr_str; |
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AVExpr *expr; |
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double var_values[VAR_VARS_NB]; |
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int pr_width, pr_height; // width and height to process
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float sigma; // used when no expression are st
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float th; // threshold (3*sigma)
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float color_dct[3][3]; // 3x3 DCT for color decorrelation
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float *cbuf[2][3]; // two planar rgb color buffers
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float *weights; // dct coeff are cumulated with overlapping; these values are used for averaging
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int p_linesize; // line sizes for color and weights
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int overlap; // number of block overlapping pixels
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int step; // block step increment (BSIZE - overlap)
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DCTContext *dct, *idct; // DCT and inverse DCT contexts
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float *block, *tmp_block; // two BSIZE x BSIZE block buffers
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} DCTdnoizContext; |
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#define OFFSET(x) offsetof(DCTdnoizContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
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static const AVOption dctdnoiz_options[] = { |
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{ "sigma", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS }, |
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{ "s", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS }, |
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{ "overlap", "set number of block overlapping pixels", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64=(1<<NBITS)-1}, 0, (1<<NBITS)-1, .flags = FLAGS }, |
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{ "expr", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, |
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{ "e", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS(dctdnoiz); |
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static float *dct_block(DCTdnoizContext *ctx, const float *src, int src_linesize) |
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{ |
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int x, y; |
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float *column; |
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for (y = 0; y < BSIZE; y++) { |
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float *line = ctx->block; |
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memcpy(line, src, BSIZE * sizeof(*line)); |
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src += src_linesize; |
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av_dct_calc(ctx->dct, line); |
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column = ctx->tmp_block + y; |
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for (x = 0; x < BSIZE; x++) { |
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*line *= x == 0 ? 1. / sqrt(BSIZE) : sqrt(2. / BSIZE); |
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*column = *line++; |
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column += BSIZE; |
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} |
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} |
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column = ctx->tmp_block; |
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for (x = 0; x < BSIZE; x++) { |
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av_dct_calc(ctx->dct, column); |
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for (y = 0; y < BSIZE; y++) |
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column[y] *= y == 0 ? 1. / sqrt(BSIZE) : sqrt(2. / BSIZE); |
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column += BSIZE; |
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} |
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for (y = 0; y < BSIZE; y++) |
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for (x = 0; x < BSIZE; x++) |
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ctx->block[y*BSIZE + x] = ctx->tmp_block[x*BSIZE + y]; |
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return ctx->block; |
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} |
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static void idct_block(DCTdnoizContext *ctx, float *dst, int dst_linesize) |
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{ |
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int x, y; |
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float *block = ctx->block; |
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float *tmp = ctx->tmp_block; |
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for (y = 0; y < BSIZE; y++) { |
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for (x = 0; x < BSIZE; x++) |
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block[x] *= x == 0 ? sqrt(BSIZE) : 1./sqrt(2. / BSIZE); |
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av_dct_calc(ctx->idct, block); |
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block += BSIZE; |
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} |
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block = ctx->block; |
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for (y = 0; y < BSIZE; y++) { |
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for (x = 0; x < BSIZE; x++) { |
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tmp[x] = block[x*BSIZE + y]; |
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tmp[x] *= x == 0 ? sqrt(BSIZE) : 1./sqrt(2. / BSIZE); |
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} |
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av_dct_calc(ctx->idct, tmp); |
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for (x = 0; x < BSIZE; x++) |
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dst[x*dst_linesize + y] += tmp[x]; |
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} |
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} |
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static int config_input(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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DCTdnoizContext *s = ctx->priv; |
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int i, x, y, bx, by, linesize, *iweights; |
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const float dct_3x3[3][3] = { |
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{ 1./sqrt(3), 1./sqrt(3), 1./sqrt(3) }, |
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{ 1./sqrt(2), 0, -1./sqrt(2) }, |
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{ 1./sqrt(6), -2./sqrt(6), 1./sqrt(6) }, |
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}; |
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uint8_t rgba_map[4]; |
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ff_fill_rgba_map(rgba_map, inlink->format); |
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for (y = 0; y < 3; y++) |
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for (x = 0; x < 3; x++) |
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s->color_dct[y][x] = dct_3x3[rgba_map[y]][rgba_map[x]]; |
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s->pr_width = inlink->w - (inlink->w - BSIZE) % s->step; |
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s->pr_height = inlink->w - (inlink->h - BSIZE) % s->step; |
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if (s->pr_width != inlink->w) |
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av_log(ctx, AV_LOG_WARNING, "The last %d horizontal pixels won't be denoised\n", |
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inlink->w - s->pr_width); |
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if (s->pr_height != inlink->h) |
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av_log(ctx, AV_LOG_WARNING, "The last %d vertical pixels won't be denoised\n", |
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inlink->h - s->pr_height); |
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s->p_linesize = linesize = FFALIGN(s->pr_width, 32); |
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for (i = 0; i < 2; i++) { |
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s->cbuf[i][0] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][0])); |
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s->cbuf[i][1] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][1])); |
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s->cbuf[i][2] = av_malloc(linesize * s->pr_height * sizeof(*s->cbuf[i][2])); |
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if (!s->cbuf[i][0] || !s->cbuf[i][1] || !s->cbuf[i][2]) |
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return AVERROR(ENOMEM); |
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} |
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s->weights = av_malloc(s->pr_height * linesize * sizeof(*s->weights)); |
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if (!s->weights) |
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return AVERROR(ENOMEM); |
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iweights = av_calloc(s->pr_height, linesize * sizeof(*iweights)); |
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if (!iweights) |
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return AVERROR(ENOMEM); |
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for (y = 0; y < s->pr_height - BSIZE + 1; y += s->step) |
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for (x = 0; x < s->pr_width - BSIZE + 1; x += s->step) |
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for (by = 0; by < BSIZE; by++) |
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for (bx = 0; bx < BSIZE; bx++) |
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iweights[(y + by)*linesize + x + bx]++; |
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for (y = 0; y < s->pr_height; y++) |
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for (x = 0; x < s->pr_width; x++) |
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s->weights[y*linesize + x] = 1. / iweights[y*linesize + x]; |
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av_free(iweights); |
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return 0; |
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} |
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static av_cold int init(AVFilterContext *ctx) |
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{ |
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DCTdnoizContext *s = ctx->priv; |
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if (s->expr_str) { |
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int ret = av_expr_parse(&s->expr, s->expr_str, var_names, |
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NULL, NULL, NULL, NULL, 0, ctx); |
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if (ret < 0) |
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return ret; |
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} |
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s->th = s->sigma * 3.; |
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s->step = BSIZE - s->overlap; |
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s->dct = av_dct_init(NBITS, DCT_II); |
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s->idct = av_dct_init(NBITS, DCT_III); |
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s->block = av_malloc(BSIZE * BSIZE * sizeof(*s->block)); |
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s->tmp_block = av_malloc(BSIZE * BSIZE * sizeof(*s->tmp_block)); |
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if (!s->dct || !s->idct || !s->tmp_block || !s->block) |
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return AVERROR(ENOMEM); |
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return 0; |
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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_BGR24, AV_PIX_FMT_RGB24, |
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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 void color_decorrelation(float dct3ch[3][3], float **dst, int dst_linesize, |
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const uint8_t *src, int src_linesize, int w, int h) |
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{ |
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int x, y; |
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float *dstp_r = dst[0]; |
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float *dstp_g = dst[1]; |
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float *dstp_b = dst[2]; |
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for (y = 0; y < h; y++) { |
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const uint8_t *srcp = src; |
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for (x = 0; x < w; x++) { |
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dstp_r[x] = srcp[0] * dct3ch[0][0] + srcp[1] * dct3ch[0][1] + srcp[2] * dct3ch[0][2]; |
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dstp_g[x] = srcp[0] * dct3ch[1][0] + srcp[1] * dct3ch[1][1] + srcp[2] * dct3ch[1][2]; |
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dstp_b[x] = srcp[0] * dct3ch[2][0] + srcp[1] * dct3ch[2][1] + srcp[2] * dct3ch[2][2]; |
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srcp += 3; |
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} |
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src += src_linesize; |
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dstp_r += dst_linesize; |
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dstp_g += dst_linesize; |
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dstp_b += dst_linesize; |
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} |
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} |
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static void color_correlation(float dct3ch[3][3], uint8_t *dst, int dst_linesize, |
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float **src, int src_linesize, int w, int h) |
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{ |
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int x, y; |
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const float *src_r = src[0]; |
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const float *src_g = src[1]; |
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const float *src_b = src[2]; |
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for (y = 0; y < h; y++) { |
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uint8_t *dstp = dst; |
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for (x = 0; x < w; x++) { |
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dstp[0] = av_clip_uint8(src_r[x] * dct3ch[0][0] + src_g[x] * dct3ch[1][0] + src_b[x] * dct3ch[2][0]); |
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dstp[1] = av_clip_uint8(src_r[x] * dct3ch[0][1] + src_g[x] * dct3ch[1][1] + src_b[x] * dct3ch[2][1]); |
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dstp[2] = av_clip_uint8(src_r[x] * dct3ch[0][2] + src_g[x] * dct3ch[1][2] + src_b[x] * dct3ch[2][2]); |
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dstp += 3; |
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} |
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dst += dst_linesize; |
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src_r += src_linesize; |
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src_g += src_linesize; |
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src_b += src_linesize; |
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} |
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} |
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static void filter_plane(AVFilterContext *ctx, |
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float *dst, int dst_linesize, |
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const float *src, int src_linesize, |
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int w, int h) |
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{ |
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int x, y, bx, by; |
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DCTdnoizContext *s = ctx->priv; |
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float *dst0 = dst; |
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const float *weights = s->weights; |
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// reset block sums
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memset(dst, 0, h * dst_linesize * sizeof(*dst)); |
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// block dct sums
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for (y = 0; y < h - BSIZE + 1; y += s->step) { |
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for (x = 0; x < w - BSIZE + 1; x += s->step) { |
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float *ftb = dct_block(s, src + x, src_linesize); |
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if (s->expr) { |
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for (by = 0; by < BSIZE; by++) { |
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for (bx = 0; bx < BSIZE; bx++) { |
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s->var_values[VAR_C] = FFABS(*ftb); |
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*ftb++ *= av_expr_eval(s->expr, s->var_values, s); |
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} |
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} |
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} else { |
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for (by = 0; by < BSIZE; by++) { |
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for (bx = 0; bx < BSIZE; bx++) { |
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if (FFABS(*ftb) < s->th) |
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*ftb = 0; |
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ftb++; |
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} |
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} |
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} |
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idct_block(s, dst + x, dst_linesize); |
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} |
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src += s->step * src_linesize; |
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dst += s->step * dst_linesize; |
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} |
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// average blocks
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dst = dst0; |
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for (y = 0; y < h; y++) { |
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for (x = 0; x < w; x++) |
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dst[x] *= weights[x]; |
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dst += dst_linesize; |
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weights += dst_linesize; |
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} |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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DCTdnoizContext *s = ctx->priv; |
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AVFilterLink *outlink = inlink->dst->outputs[0]; |
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int direct, plane; |
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AVFrame *out; |
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if (av_frame_is_writable(in)) { |
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direct = 1; |
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out = in; |
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} else { |
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direct = 0; |
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
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if (!out) { |
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av_frame_free(&in); |
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return AVERROR(ENOMEM); |
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} |
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av_frame_copy_props(out, in); |
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} |
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color_decorrelation(s->color_dct, s->cbuf[0], s->p_linesize, |
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in->data[0], in->linesize[0], s->pr_width, s->pr_height); |
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for (plane = 0; plane < 3; plane++) |
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filter_plane(ctx, s->cbuf[1][plane], s->p_linesize, |
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s->cbuf[0][plane], s->p_linesize, |
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s->pr_width, s->pr_height); |
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color_correlation(s->color_dct, out->data[0], out->linesize[0], |
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s->cbuf[1], s->p_linesize, s->pr_width, s->pr_height); |
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if (!direct) { |
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int y; |
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uint8_t *dst = out->data[0]; |
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const uint8_t *src = in->data[0]; |
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const int dst_linesize = out->linesize[0]; |
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const int src_linesize = in->linesize[0]; |
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const int hpad = (inlink->w - s->pr_width) * 3; |
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const int vpad = (inlink->h - s->pr_height); |
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if (hpad) { |
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uint8_t *dstp = dst + s->pr_width * 3; |
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const uint8_t *srcp = src + s->pr_width * 3; |
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for (y = 0; y < s->pr_height; y++) { |
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memcpy(dstp, srcp, hpad); |
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dstp += dst_linesize; |
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srcp += src_linesize; |
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} |
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} |
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if (vpad) { |
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uint8_t *dstp = dst + s->pr_height * dst_linesize; |
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const uint8_t *srcp = src + s->pr_height * src_linesize; |
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for (y = 0; y < vpad; y++) { |
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memcpy(dstp, srcp, inlink->w * 3); |
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dstp += dst_linesize; |
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srcp += src_linesize; |
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} |
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} |
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av_frame_free(&in); |
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} |
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return ff_filter_frame(outlink, out); |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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int i; |
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DCTdnoizContext *s = ctx->priv; |
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av_dct_end(s->dct); |
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av_dct_end(s->idct); |
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av_free(s->block); |
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av_free(s->tmp_block); |
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av_free(s->weights); |
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for (i = 0; i < 2; i++) { |
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av_free(s->cbuf[i][0]); |
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av_free(s->cbuf[i][1]); |
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av_free(s->cbuf[i][2]); |
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} |
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av_expr_free(s->expr); |
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} |
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static const AVFilterPad dctdnoiz_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_input, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad dctdnoiz_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_dctdnoiz = { |
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.name = "dctdnoiz", |
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.description = NULL_IF_CONFIG_SMALL("Denoise frames using 2D DCT."), |
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.priv_size = sizeof(DCTdnoizContext), |
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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 = dctdnoiz_inputs, |
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.outputs = dctdnoiz_outputs, |
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.priv_class = &dctdnoiz_class, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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}; |
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