1431b4cf77
The 4th planes is currently unused as no formats with alpha are supported yet Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
347 lines
12 KiB
C
347 lines
12 KiB
C
/*
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* Copyright (c) 2015 Arwa Arif <arwaarif1994@gmail.com>
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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 it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License,
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* 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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* @file
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* FFT domain filtering.
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*/
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#include "libavfilter/internal.h"
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#include "libavutil/common.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "libavcodec/avfft.h"
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#include "libavutil/eval.h"
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#define MAX_PLANES 4
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typedef struct {
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const AVClass *class;
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RDFTContext *rdft;
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int rdft_hbits[MAX_PLANES];
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int rdft_vbits[MAX_PLANES];
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size_t rdft_hlen[MAX_PLANES];
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size_t rdft_vlen[MAX_PLANES];
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FFTSample *rdft_hdata[MAX_PLANES];
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FFTSample *rdft_vdata[MAX_PLANES];
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int dc[MAX_PLANES];
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char *weight_str[MAX_PLANES];
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AVExpr *weight_expr[MAX_PLANES];
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double *weight[MAX_PLANES];
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} FFTFILTContext;
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static const char *const var_names[] = { "X", "Y", "W", "H", NULL };
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enum { VAR_X, VAR_Y, VAR_W, VAR_H, VAR_VARS_NB };
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enum { Y = 0, U, V };
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#define OFFSET(x) offsetof(FFTFILTContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption fftfilt_options[] = {
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{ "dc_Y", "adjust gain in Y plane", OFFSET(dc[Y]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
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{ "dc_U", "adjust gain in U plane", OFFSET(dc[U]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
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{ "dc_V", "adjust gain in V plane", OFFSET(dc[V]), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1000, FLAGS },
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{ "weight_Y", "set luminance expression in Y plane", OFFSET(weight_str[Y]), AV_OPT_TYPE_STRING, {.str = "1"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "weight_U", "set chrominance expression in U plane", OFFSET(weight_str[U]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "weight_V", "set chrominance expression in V plane", OFFSET(weight_str[V]), AV_OPT_TYPE_STRING, {.str = NULL}, CHAR_MIN, CHAR_MAX, FLAGS },
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{NULL},
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};
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AVFILTER_DEFINE_CLASS(fftfilt);
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static inline double lum(void *priv, double x, double y, int plane)
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{
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FFTFILTContext *fftfilt = priv;
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return fftfilt->rdft_vdata[plane][(int)x * fftfilt->rdft_vlen[plane] + (int)y];
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}
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static double weight_Y(void *priv, double x, double y) { return lum(priv, x, y, Y); }
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static double weight_U(void *priv, double x, double y) { return lum(priv, x, y, U); }
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static double weight_V(void *priv, double x, double y) { return lum(priv, x, y, V); }
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static void copy_rev (FFTSample *dest, int w, int w2)
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{
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int i;
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for (i = w; i < w + (w2-w)/2; i++)
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dest[i] = dest[2*w - i - 1];
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for (; i < w2; i++)
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dest[i] = dest[w2 - i];
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}
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/*Horizontal pass - RDFT*/
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static void rdft_horizontal(FFTFILTContext *fftfilt, AVFrame *in, int w, int h, int plane)
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{
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int i, j;
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fftfilt->rdft = av_rdft_init(fftfilt->rdft_hbits[plane], DFT_R2C);
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for (i = 0; i < h; i++) {
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for (j = 0; j < w; j++)
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fftfilt->rdft_hdata[plane][i * fftfilt->rdft_hlen[plane] + j] = *(in->data[plane] + in->linesize[plane] * i + j);
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copy_rev(fftfilt->rdft_hdata[plane] + i * fftfilt->rdft_hlen[plane], w, fftfilt->rdft_hlen[plane]);
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}
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for (i = 0; i < h; i++)
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av_rdft_calc(fftfilt->rdft, fftfilt->rdft_hdata[plane] + i * fftfilt->rdft_hlen[plane]);
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av_rdft_end(fftfilt->rdft);
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}
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/*Vertical pass - RDFT*/
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static void rdft_vertical(FFTFILTContext *fftfilt, int h, int plane)
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{
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int i, j;
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fftfilt->rdft = av_rdft_init(fftfilt->rdft_vbits[plane], DFT_R2C);
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for (i = 0; i < fftfilt->rdft_hlen[plane]; i++) {
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for (j = 0; j < h; j++)
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fftfilt->rdft_vdata[plane][i * fftfilt->rdft_vlen[plane] + j] =
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fftfilt->rdft_hdata[plane][j * fftfilt->rdft_hlen[plane] + i];
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copy_rev(fftfilt->rdft_vdata[plane] + i * fftfilt->rdft_vlen[plane], h, fftfilt->rdft_vlen[plane]);
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}
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for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
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av_rdft_calc(fftfilt->rdft, fftfilt->rdft_vdata[plane] + i * fftfilt->rdft_vlen[plane]);
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av_rdft_end(fftfilt->rdft);
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}
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/*Vertical pass - IRDFT*/
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static void irdft_vertical(FFTFILTContext *fftfilt, int h, int plane)
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{
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int i, j;
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fftfilt->rdft = av_rdft_init(fftfilt->rdft_vbits[plane], IDFT_C2R);
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for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
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av_rdft_calc(fftfilt->rdft, fftfilt->rdft_vdata[plane] + i * fftfilt->rdft_vlen[plane]);
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for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
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for (j = 0; j < h; j++)
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fftfilt->rdft_hdata[plane][j * fftfilt->rdft_hlen[plane] + i] =
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fftfilt->rdft_vdata[plane][i * fftfilt->rdft_vlen[plane] + j];
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av_rdft_end(fftfilt->rdft);
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}
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/*Horizontal pass - IRDFT*/
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static void irdft_horizontal(FFTFILTContext *fftfilt, AVFrame *out, int w, int h, int plane)
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{
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int i, j;
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fftfilt->rdft = av_rdft_init(fftfilt->rdft_hbits[plane], IDFT_C2R);
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for (i = 0; i < h; i++)
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av_rdft_calc(fftfilt->rdft, fftfilt->rdft_hdata[plane] + i * fftfilt->rdft_hlen[plane]);
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for (i = 0; i < h; i++)
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for (j = 0; j < w; j++)
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*(out->data[plane] + out->linesize[plane] * i + j) = av_clip(fftfilt->rdft_hdata[plane][i
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*fftfilt->rdft_hlen[plane] + j] * 4 /
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(fftfilt->rdft_hlen[plane] *
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fftfilt->rdft_vlen[plane]), 0, 255);
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av_rdft_end(fftfilt->rdft);
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}
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static av_cold int initialize(AVFilterContext *ctx)
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{
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FFTFILTContext *fftfilt = ctx->priv;
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int ret = 0, plane;
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if (!fftfilt->dc[U] && !fftfilt->dc[V]) {
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fftfilt->dc[U] = fftfilt->dc[Y];
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fftfilt->dc[V] = fftfilt->dc[Y];
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} else {
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if (!fftfilt->dc[U]) fftfilt->dc[U] = fftfilt->dc[V];
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if (!fftfilt->dc[V]) fftfilt->dc[V] = fftfilt->dc[U];
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}
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if (!fftfilt->weight_str[U] && !fftfilt->weight_str[V]) {
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fftfilt->weight_str[U] = av_strdup(fftfilt->weight_str[Y]);
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fftfilt->weight_str[V] = av_strdup(fftfilt->weight_str[Y]);
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} else {
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if (!fftfilt->weight_str[U]) fftfilt->weight_str[U] = av_strdup(fftfilt->weight_str[V]);
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if (!fftfilt->weight_str[V]) fftfilt->weight_str[V] = av_strdup(fftfilt->weight_str[U]);
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}
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for (plane = 0; plane < 3; plane++) {
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static double (*p[])(void *, double, double) = { weight_Y, weight_U, weight_V };
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const char *const func2_names[] = {"weight_Y", "weight_U", "weight_V", NULL };
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double (*func2[])(void *, double, double) = { weight_Y, weight_U, weight_V, p[plane], NULL };
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ret = av_expr_parse(&fftfilt->weight_expr[plane], fftfilt->weight_str[plane], var_names,
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NULL, NULL, func2_names, func2, 0, ctx);
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if (ret < 0)
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break;
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}
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return ret;
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}
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static int config_props(AVFilterLink *inlink)
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{
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FFTFILTContext *fftfilt = inlink->dst->priv;
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const AVPixFmtDescriptor *desc;
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int rdft_hbits, rdft_vbits, i, j, plane;
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double values[VAR_VARS_NB];
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desc = av_pix_fmt_desc_get(inlink->format);
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for (i = 0; i < desc->nb_components; i++) {
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int w = inlink->w;
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int h = inlink->h;
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/* RDFT - Array initialization for Horizontal pass*/
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for (rdft_hbits = 1; 1 << rdft_hbits < w*10/9; rdft_hbits++);
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fftfilt->rdft_hbits[i] = rdft_hbits;
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fftfilt->rdft_hlen[i] = 1 << rdft_hbits;
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if (!(fftfilt->rdft_hdata[i] = av_malloc_array(h, fftfilt->rdft_hlen[i] * sizeof(FFTSample))))
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return AVERROR(ENOMEM);
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/* RDFT - Array initialization for Vertical pass*/
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for (rdft_vbits = 1; 1 << rdft_vbits < h*10/9; rdft_vbits++);
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fftfilt->rdft_vbits[i] = rdft_vbits;
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fftfilt->rdft_vlen[i] = 1 << rdft_vbits;
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if (!(fftfilt->rdft_vdata[i] = av_malloc_array(fftfilt->rdft_hlen[i], fftfilt->rdft_vlen[i] * sizeof(FFTSample))))
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return AVERROR(ENOMEM);
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}
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/*Luminance value - Array initialization*/
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values[VAR_W] = inlink->w;
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values[VAR_H] = inlink->h;
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for (plane = 0; plane < 3; plane++)
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{
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if(!(fftfilt->weight[plane] = av_malloc_array(fftfilt->rdft_hlen[plane], fftfilt->rdft_vlen[plane] * sizeof(double))))
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return AVERROR(ENOMEM);
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for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
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{
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values[VAR_X] = i;
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for (j = 0; j < fftfilt->rdft_vlen[plane]; j++)
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{
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values[VAR_Y] = j;
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fftfilt->weight[plane][i * fftfilt->rdft_vlen[plane] + j] =
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av_expr_eval(fftfilt->weight_expr[plane], values, fftfilt);
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}
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}
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}
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return 0;
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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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AVFilterLink *outlink = inlink->dst->outputs[0];
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const AVPixFmtDescriptor *desc;
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FFTFILTContext *fftfilt = ctx->priv;
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AVFrame *out;
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int i, j, plane;
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out = ff_get_video_buffer(outlink, inlink->w, inlink->h);
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if (!out)
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return AVERROR(ENOMEM);
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av_frame_copy_props(out, in);
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desc = av_pix_fmt_desc_get(inlink->format);
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for (plane = 0; plane < desc->nb_components; plane++) {
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int w = inlink->w;
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int h = inlink->h;
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if (plane == 1 || plane == 2) {
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w = FF_CEIL_RSHIFT(w, desc->log2_chroma_w);
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h = FF_CEIL_RSHIFT(h, desc->log2_chroma_h);
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}
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rdft_horizontal(fftfilt, in, w, h, plane);
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rdft_vertical(fftfilt, h, plane);
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/*Change user defined parameters*/
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for (i = 0; i < fftfilt->rdft_hlen[plane]; i++)
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for (j = 0; j < fftfilt->rdft_vlen[plane]; j++)
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fftfilt->rdft_vdata[plane][i * fftfilt->rdft_vlen[plane] + j] *=
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fftfilt->weight[plane][i * fftfilt->rdft_vlen[plane] + j];
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fftfilt->rdft_vdata[plane][0] += fftfilt->rdft_hlen[plane] * fftfilt->rdft_vlen[plane] * fftfilt->dc[plane];
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irdft_vertical(fftfilt, h, plane);
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irdft_horizontal(fftfilt, out, w, h, plane);
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}
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av_frame_free(&in);
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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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FFTFILTContext *fftfilt = ctx->priv;
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int i;
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for (i = 0; i < MAX_PLANES; i++) {
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av_free(fftfilt->rdft_hdata[i]);
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av_free(fftfilt->rdft_vdata[i]);
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av_expr_free(fftfilt->weight_expr[i]);
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av_free(fftfilt->weight[i]);
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}
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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 pixel_fmts_fftfilt[] = {
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_YUV444P,
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AV_PIX_FMT_NONE
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};
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AVFilterFormats *fmts_list = ff_make_format_list(pixel_fmts_fftfilt);
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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 const AVFilterPad fftfilt_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = config_props,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad fftfilt_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_fftfilt = {
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.name = "fftfilt",
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.description = NULL_IF_CONFIG_SMALL("Apply arbitrary expressions to samples in frequency domain"),
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.priv_size = sizeof(FFTFILTContext),
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.priv_class = &fftfilt_class,
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.inputs = fftfilt_inputs,
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.outputs = fftfilt_outputs,
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.query_formats = query_formats,
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.init = initialize,
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.uninit = uninit,
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};
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