mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
3 years ago
parent
b1b7249606
commit
43ea19fef4
6 changed files with 619 additions and 1 deletions
@ -0,0 +1,582 @@ |
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/*
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* Copyright (c) 2022 Paul B Mahol |
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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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* @file |
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* Compute a look-up table from map of colors. |
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*/ |
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#include "config_components.h" |
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#include "libavutil/attributes.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/common.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/pixdesc.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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#include "framesync.h" |
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#include "video.h" |
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#define MAX_SIZE 64 |
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enum KernelType { |
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EUCLIDEAN, |
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WEUCLIDEAN, |
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NB_KERNELS, |
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}; |
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typedef struct ColorMapContext { |
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const AVClass *class; |
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int w, h; |
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int size; |
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int nb_maps; |
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int changed[2]; |
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float source[MAX_SIZE][4]; |
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float ttarget[MAX_SIZE][4]; |
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float target[MAX_SIZE][4]; |
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float icoeff[4][4]; |
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float coeff[MAX_SIZE][4]; |
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int target_type; |
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int kernel_type; |
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float (*kernel)(const float *x, const float *y); |
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FFFrameSync fs; |
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} ColorMapContext; |
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#define OFFSET(x) offsetof(ColorMapContext, x) |
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption colormap_options[] = { |
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{ "patch_size", "set patch size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "64x64"}, 0, 0, FLAGS }, |
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{ "nb_patches", "set number of patches", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 8}, 1, MAX_SIZE, FLAGS }, |
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{ "type", "set the target type used", OFFSET(target_type), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "type" }, |
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{ "relative", "the target colors are relative", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 1, FLAGS, "type" }, |
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{ "absolute", "the target colors are absolute", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 1, FLAGS, "type" }, |
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{ "kernel", "set the kernel used for measuring color difference", OFFSET(kernel_type), AV_OPT_TYPE_INT, {.i64=0}, 0, NB_KERNELS-1, FLAGS, "kernel" }, |
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{ "euclidean", "square root of sum of squared differences", 0, AV_OPT_TYPE_CONST, {.i64=EUCLIDEAN}, 0, 0, FLAGS, "kernel" }, |
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{ "weuclidean", "weighted square root of sum of squared differences",0, AV_OPT_TYPE_CONST, {.i64=WEUCLIDEAN}, 0, 0, FLAGS, "kernel" }, |
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{ NULL } |
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}; |
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static int gauss_make_triangular(double *A, int *p, int n) |
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{ |
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p[n - 1] = n - 1; |
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for (int k = 0; k < n; k++) { |
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double t1; |
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int m = k; |
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for (int i = k + 1; i < n; i++) |
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if (fabs(A[k + n * i]) > fabs(A[k + n * m])) |
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m = i; |
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p[k] = m; |
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t1 = A[k + n * m]; |
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A[k + n * m] = A[k + n * k]; |
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A[k + n * k] = t1; |
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if (t1 != 0) { |
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for (int i = k + 1; i < n; i++) |
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A[k + n * i] /= -t1; |
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if (k != m) |
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for (int i = k + 1; i < n; i++) { |
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double t2 = A[i + n * m]; |
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A[i + n * m] = A[i + n * k]; |
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A[i + n * k] = t2; |
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} |
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for (int j = k + 1; j < n; j++) |
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for (int i = k + 1; i < n; i++) |
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A[i + n * j] += A[k + j * n] * A[i + k * n]; |
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} else { |
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return 0; |
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} |
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} |
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return 1; |
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} |
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static void gauss_solve_triangular(const double *A, const int *p, double *b, int n) |
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{ |
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for(int k = 0; k < n - 1; k++) { |
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int m = p[k]; |
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double t = b[m]; |
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b[m] = b[k]; |
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b[k] = t; |
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for (int i = k + 1; i < n; i++) |
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b[i] += A[k + n * i] * t; |
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} |
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for(int k = n - 1; k > 0; k--) { |
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b[k] /= A[k + n * k]; |
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double t = b[k]; |
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for (int i = 0; i < k; i++) |
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b[i] -= A[k + n * i] * t; |
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} |
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b[0] /= A[0 + 0 * n]; |
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} |
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static int gauss_solve(double *A, double *b, int n) |
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{ |
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int *p = av_calloc(n, sizeof(*p)); |
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if (!p) |
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return 1; |
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if (!gauss_make_triangular(A, p, n)) { |
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av_freep(&p); |
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return 1; |
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} |
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gauss_solve_triangular(A, p, b, n); |
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av_freep(&p); |
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return 0; |
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} |
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#define P2(x) ((x)*(x)) |
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static float euclidean_kernel(const float *x, const float *y) |
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{ |
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const float d2 = P2(x[0]-y[0]) + |
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P2(x[1]-y[1]) + |
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P2(x[2]-y[2]); |
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return sqrtf(d2); |
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} |
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static float weuclidean_kernel(const float *x, const float *y) |
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{ |
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const float rm = (x[0] + y[0]) * 0.5f; |
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const float d2 = P2(x[0]-y[0]) * (2.f + rm) + |
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P2(x[1]-y[1]) * 4.f + |
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P2(x[2]-y[2]) * (3.f - rm); |
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return sqrtf(d2); |
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} |
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static void build_map(AVFilterContext *ctx) |
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{ |
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ColorMapContext *s = ctx->priv; |
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for (int j = 0; j < s->nb_maps; j++) { |
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s->target[j][0] = s->target_type == 0 ? s->source[j][0] + s->ttarget[j][0] : s->ttarget[j][0]; |
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s->target[j][1] = s->target_type == 0 ? s->source[j][1] + s->ttarget[j][1] : s->ttarget[j][1]; |
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s->target[j][2] = s->target_type == 0 ? s->source[j][2] + s->ttarget[j][2] : s->ttarget[j][2]; |
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} |
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for (int c = 0; c < 3; c++) { |
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for (int j = 0; j < s->nb_maps; j++) |
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s->coeff[j][c] = 0.f; |
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for (int j = 0; j < 4; j++) { |
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s->icoeff[j][c] = 0; |
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s->icoeff[j][c] = 0; |
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s->icoeff[j][c] = 0; |
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} |
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s->icoeff[c+1][c] = 1.f; |
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switch (s->nb_maps) { |
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case 1: |
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{ |
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float div = fabsf(s->source[0][c]) < 1e-6f ? 1e-6f : s->source[0][c]; |
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s->icoeff[c][1+c] = s->target[0][c] / div; |
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} |
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break; |
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case 2: |
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{ |
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double A[2 * 2] = { 1, s->source[0][c], |
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1, s->source[1][c] }; |
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double b[2] = { s->target[0][c], s->target[1][c] }; |
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if (gauss_solve(A, b, 2)) |
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continue; |
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s->icoeff[0 ][c] = b[0]; |
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s->icoeff[1+c][c] = b[1]; |
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} |
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break; |
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case 3: |
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{ |
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const uint8_t idx[3][3] = {{ 0, 1, 2 }, |
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{ 1, 0, 2 }, |
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{ 2, 0, 1 }}; |
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const uint8_t didx[3][4] = {{ 0, 1, 2, 2 }, |
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{ 0, 2, 1, 2 }, |
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{ 0, 2, 2, 1 }}; |
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const int C0 = idx[c][0]; |
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const int C1 = idx[c][1]; |
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const int C2 = idx[c][2]; |
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double A[3 * 3] = { 1, s->source[0][C0], s->source[0][C1] + s->source[0][C2], |
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1, s->source[1][C0], s->source[1][C1] + s->source[1][C2], |
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1, s->source[2][C0], s->source[2][C1] + s->source[2][C2] }; |
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double b[3] = { s->target[0][c], s->target[1][c], s->target[2][c] }; |
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if (gauss_solve(A, b, 3)) |
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continue; |
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s->icoeff[0][c] = b[didx[c][0]]; |
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s->icoeff[1][c] = b[didx[c][1]]; |
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s->icoeff[2][c] = b[didx[c][2]]; |
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s->icoeff[3][c] = b[didx[c][3]]; |
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} |
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break; |
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case 4: |
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{ |
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double A[4 * 4] = { 1, s->source[0][0], s->source[0][1], s->source[0][2], |
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1, s->source[1][0], s->source[1][1], s->source[1][2], |
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1, s->source[2][0], s->source[2][1], s->source[2][2], |
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1, s->source[3][0], s->source[3][1], s->source[3][2] }; |
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double b[4] = { s->target[0][c], s->target[1][c], s->target[2][c], s->target[3][c] }; |
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int pivot[4]; |
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if (!gauss_make_triangular(A, pivot, 4)) |
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continue; |
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gauss_solve_triangular(A, pivot, b, 4); |
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s->icoeff[0][c] = b[0]; |
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s->icoeff[1][c] = b[1]; |
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s->icoeff[2][c] = b[2]; |
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s->icoeff[3][c] = b[3]; |
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} |
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break; |
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default: |
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{ |
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const int N = s->nb_maps; |
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const int N4 = N + 4; |
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double *A = av_calloc(sizeof(*A), N4 * N4); |
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double *b = av_calloc(sizeof(*b), N4); |
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int *pivot = NULL; |
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if (!A || !b) |
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goto error; |
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for (int j = 0; j < N; j++) |
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for (int i = j; i < N; i++) |
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A[j*N4+i] = A[i*N4+j] = s->kernel(s->source[i], s->source[j]); |
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for (int i = 0; i < N; i++) |
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A[i*N4+N+0] = A[(N+0)*N4+i] = 1; |
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for (int i = 0; i < N; i++) |
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A[i*N4+N+1] = A[(N+1)*N4+i] = s->source[i][0]; |
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for (int i = 0; i < N; i++) |
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A[i*N4+N+2] = A[(N+2)*N4+i] = s->source[i][1]; |
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for (int i = 0; i < N; i++) |
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A[i*N4+N+3] = A[(N+3)*N4+i] = s->source[i][2]; |
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for (int j = N; j < N4; j++) |
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for (int i = N;i < N4; i++) |
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A[j * N4 + i] = 0.; |
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pivot = av_calloc(N4, sizeof(*pivot)); |
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if (!pivot) |
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goto error; |
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if (gauss_make_triangular(A, pivot, N4)) { |
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for (int i = 0; i < N; i++) |
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b[i] = s->target[i][c]; |
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for (int i = N; i < N + 4; i++) |
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b[i] = 0; |
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gauss_solve_triangular(A, pivot, b, N4); |
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for (int i = 0; i < N; i++) |
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s->coeff[i][c] = b[i]; |
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for (int i = 0; i < 4; i++) |
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s->icoeff[i][c] = b[N + i]; |
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} |
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error: |
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av_free(pivot); |
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av_free(b); |
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av_free(A); |
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} |
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} |
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} |
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} |
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typedef struct ThreadData { |
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AVFrame *in, *out; |
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} ThreadData; |
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static int colormap_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) |
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{ |
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ColorMapContext *s = ctx->priv; |
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ThreadData *td = arg; |
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AVFrame *in = td->in; |
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AVFrame *out = td->out; |
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const int maps = s->nb_maps; |
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const int width = out->width; |
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const int height = out->height; |
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const int slice_start = (height * jobnr) / nb_jobs; |
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const int slice_end = (height * (jobnr + 1)) / nb_jobs; |
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const int sr_linesize = in->linesize[2] / 4; |
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const int dr_linesize = out->linesize[2] / 4; |
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const int sg_linesize = in->linesize[0] / 4; |
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const int dg_linesize = out->linesize[0] / 4; |
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const int sb_linesize = in->linesize[1] / 4; |
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const int db_linesize = out->linesize[1] / 4; |
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const float *sr = (float *)in->data[2] + slice_start * sr_linesize; |
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const float *sg = (float *)in->data[0] + slice_start * sg_linesize; |
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const float *sb = (float *)in->data[1] + slice_start * sb_linesize; |
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float *r = (float *)out->data[2] + slice_start * dr_linesize; |
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float *g = (float *)out->data[0] + slice_start * dg_linesize; |
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float *b = (float *)out->data[1] + slice_start * db_linesize; |
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float (*kernel)(const float *x, const float *y) = s->kernel; |
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const float *icoeff[4] = { s->icoeff[0], s->icoeff[1], s->icoeff[2], s->icoeff[3] }; |
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for (int y = slice_start; y < slice_end; y++) { |
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for (int x = 0; x < width; x++) { |
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const float input[3] = { sr[x], sg[x], sb[x] }; |
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float srv, sgv, sbv; |
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float rv, gv, bv; |
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srv = sr[x]; |
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sgv = sg[x]; |
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sbv = sb[x]; |
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rv = icoeff[0][0]; |
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gv = icoeff[0][1]; |
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bv = icoeff[0][2]; |
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rv += icoeff[1][0] * srv + icoeff[2][0] * sgv + icoeff[3][0] * sbv; |
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gv += icoeff[1][1] * srv + icoeff[2][1] * sgv + icoeff[3][1] * sbv; |
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bv += icoeff[1][2] * srv + icoeff[2][2] * sgv + icoeff[3][2] * sbv; |
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for (int z = 0; z < maps && maps > 4; z++) { |
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const float *coeff = s->coeff[z]; |
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const float cr = coeff[0]; |
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const float cg = coeff[1]; |
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const float cb = coeff[2]; |
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const float f = kernel(input, s->source[z]); |
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rv += f * cr; |
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gv += f * cg; |
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bv += f * cb; |
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} |
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r[x] = rv; |
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g[x] = gv; |
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b[x] = bv; |
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} |
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sg += sg_linesize; |
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g += dg_linesize; |
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sb += sb_linesize; |
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b += db_linesize; |
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sr += sr_linesize; |
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r += dr_linesize; |
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} |
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return 0; |
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} |
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static int import_map(AVFilterLink *inlink, AVFrame *in) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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ColorMapContext *s = ctx->priv; |
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const int is_target = FF_INLINK_IDX(inlink) > 1; |
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const int pw = s->w; |
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const int pw2 = s->w / 2; |
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const int ph = s->h; |
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const int ph2 = s->h / 2; |
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int changed = 0; |
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int idx; |
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for (int plane = 0; plane < 3; plane++) { |
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const int c = plane == 0 ? 1 : plane == 1 ? 2 : 0; |
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idx = 0; |
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for (int y = ph2; y < in->height && idx < MAX_SIZE; y += ph) { |
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const float *src = (const float *)(in->data[plane] + y * in->linesize[plane]); |
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for (int x = pw2; x < in->width && idx < MAX_SIZE; x += pw) { |
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float value = src[x]; |
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if (is_target) { |
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if (s->ttarget[idx][c] != value) |
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changed = 1; |
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s->ttarget[idx][c] = value; |
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} else { |
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if (s->source[idx][c] != value) |
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changed = 1; |
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s->source[idx][c] = value; |
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} |
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idx++; |
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} |
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} |
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} |
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if (changed) |
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s->changed[is_target] = 1; |
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if (!is_target) |
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s->nb_maps = FFMIN(idx, s->size); |
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return 0; |
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} |
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static int process_frame(FFFrameSync *fs) |
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{ |
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AVFilterContext *ctx = fs->parent; |
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ColorMapContext *s = fs->opaque; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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AVFrame *in, *out, *source, *target; |
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ThreadData td; |
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int ret; |
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switch (s->kernel_type) { |
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case EUCLIDEAN: |
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s->kernel = euclidean_kernel; |
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break; |
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case WEUCLIDEAN: |
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s->kernel = weuclidean_kernel; |
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break; |
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default: |
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return AVERROR_BUG; |
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} |
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if ((ret = ff_framesync_get_frame(&s->fs, 0, &in, 1)) < 0 || |
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(ret = ff_framesync_get_frame(&s->fs, 1, &source, 0)) < 0 || |
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(ret = ff_framesync_get_frame(&s->fs, 2, &target, 0)) < 0) |
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return ret; |
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import_map(ctx->inputs[1], source); |
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import_map(ctx->inputs[2], target); |
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if (s->changed[0] || s->changed[1]) { |
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build_map(ctx); |
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s->changed[0] = s->changed[1] = 0; |
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} |
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if (!ctx->is_disabled) { |
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if (av_frame_is_writable(in)) { |
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out = in; |
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} else { |
||||
out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
||||
if (!out) { |
||||
av_frame_free(&in); |
||||
return AVERROR(ENOMEM); |
||||
} |
||||
av_frame_copy_props(out, in); |
||||
} |
||||
|
||||
td.in = in; |
||||
td.out = out; |
||||
ff_filter_execute(ctx, colormap_slice, &td, NULL, |
||||
FFMIN(in->height, ff_filter_get_nb_threads(ctx))); |
||||
|
||||
if (out != in) |
||||
av_frame_free(&in); |
||||
} else { |
||||
out = in; |
||||
} |
||||
|
||||
out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base); |
||||
|
||||
return ff_filter_frame(outlink, out); |
||||
} |
||||
|
||||
static int config_output(AVFilterLink *outlink) |
||||
{ |
||||
AVFilterContext *ctx = outlink->src; |
||||
ColorMapContext *s = ctx->priv; |
||||
AVFilterLink *inlink = ctx->inputs[0]; |
||||
AVFilterLink *source = ctx->inputs[1]; |
||||
AVFilterLink *target = ctx->inputs[2]; |
||||
FFFrameSyncIn *in; |
||||
int ret; |
||||
|
||||
outlink->time_base = inlink->time_base; |
||||
outlink->frame_rate = inlink->frame_rate; |
||||
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio; |
||||
outlink->w = inlink->w; |
||||
outlink->h = inlink->h; |
||||
|
||||
if ((ret = ff_framesync_init(&s->fs, ctx, 3)) < 0) |
||||
return ret; |
||||
|
||||
in = s->fs.in; |
||||
in[0].time_base = inlink->time_base; |
||||
in[1].time_base = source->time_base; |
||||
in[2].time_base = target->time_base; |
||||
in[0].sync = 1; |
||||
in[0].before = EXT_STOP; |
||||
in[0].after = EXT_INFINITY; |
||||
in[1].sync = 1; |
||||
in[1].before = EXT_STOP; |
||||
in[1].after = EXT_INFINITY; |
||||
in[2].sync = 1; |
||||
in[2].before = EXT_STOP; |
||||
in[2].after = EXT_INFINITY; |
||||
s->fs.opaque = s; |
||||
s->fs.on_event = process_frame; |
||||
|
||||
ret = ff_framesync_configure(&s->fs); |
||||
outlink->time_base = s->fs.time_base; |
||||
|
||||
return ret; |
||||
} |
||||
|
||||
static int activate(AVFilterContext *ctx) |
||||
{ |
||||
ColorMapContext *s = ctx->priv; |
||||
return ff_framesync_activate(&s->fs); |
||||
} |
||||
|
||||
static const AVFilterPad inputs[] = { |
||||
{ |
||||
.name = "default", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
}, |
||||
{ |
||||
.name = "source", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
}, |
||||
{ |
||||
.name = "target", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
}, |
||||
}; |
||||
|
||||
static const AVFilterPad outputs[] = { |
||||
{ |
||||
.name = "default", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
.config_props = config_output, |
||||
}, |
||||
}; |
||||
|
||||
AVFILTER_DEFINE_CLASS(colormap); |
||||
|
||||
const AVFilter ff_vf_colormap = { |
||||
.name = "colormap", |
||||
.description = NULL_IF_CONFIG_SMALL("Apply custom Color Maps to video stream."), |
||||
.priv_class = &colormap_class, |
||||
.priv_size = sizeof(ColorMapContext), |
||||
.activate = activate, |
||||
FILTER_INPUTS(inputs), |
||||
FILTER_OUTPUTS(outputs), |
||||
FILTER_PIXFMTS(AV_PIX_FMT_GBRPF32, AV_PIX_FMT_GBRAPF32), |
||||
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | |
||||
AVFILTER_FLAG_SLICE_THREADS, |
||||
.process_command = ff_filter_process_command, |
||||
}; |
||||
Loading…
Reference in new issue