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diff --git a/libavfilter/vf_dctdnoiz.c b/libavfilter/vf_dctdnoiz.c
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+++ b/libavfilter/vf_dctdnoiz.c
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+/*
+ * Copyright (c) 2013-2014 Clément Bœsch
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * A simple, relatively efficient and slow DCT image denoiser.
+ *
+ * @see http://www.ipol.im/pub/art/2011/ys-dct/
+ *
+ * The DCT factorization used is based on "Fast and numerically stable
+ * algorithms for discrete cosine transforms" from Gerlind Plonkaa & Manfred
+ * Tasche (DOI: 10.1016/j.laa.2004.07.015).
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/eval.h"
+#include "libavutil/opt.h"
+#include "internal.h"
+
+static const char *const var_names[] = { "c", NULL };
+enum { VAR_C, VAR_VARS_NB };
+
+#define MAX_THREADS 8
+
+typedef struct DCTdnoizContext {
+ const AVClass *class;
+
+ /* coefficient factor expression */
+ char *expr_str;
+ AVExpr *expr[MAX_THREADS];
+ double var_values[MAX_THREADS][VAR_VARS_NB];
+
+ int nb_threads;
+ int pr_width, pr_height; // width and height to process
+ float sigma; // used when no expression are st
+ float th; // threshold (3*sigma)
+ float *cbuf[2][3]; // two planar rgb color buffers
+ float *slices[MAX_THREADS]; // slices buffers (1 slice buffer per thread)
+ float *weights; // dct coeff are cumulated with overlapping; these values are used for averaging
+ int p_linesize; // line sizes for color and weights
+ int overlap; // number of block overlapping pixels
+ int step; // block step increment (blocksize - overlap)
+ int n; // 1<<n is the block size
+ int bsize; // block size, 1<<n
+ void (*filter_freq_func)(struct DCTdnoizContext *s,
+ const float *src, int src_linesize,
+ float *dst, int dst_linesize,
+ int thread_id);
+ void (*color_decorrelation)(float **dst, int dst_linesize,
+ const uint8_t *src, int src_linesize,
+ int w, int h);
+ void (*color_correlation)(uint8_t *dst, int dst_linesize,
+ float **src, int src_linesize,
+ int w, int h);
+} DCTdnoizContext;
+
+#define MIN_NBITS 3 /* blocksize = 1<<3 = 8 */
+#define MAX_NBITS 4 /* blocksize = 1<<4 = 16 */
+#define DEFAULT_NBITS 3
+
+#define OFFSET(x) offsetof(DCTdnoizContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption dctdnoiz_options[] = {
+ { "sigma", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
+ { "s", "set noise sigma constant", OFFSET(sigma), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, 999, .flags = FLAGS },
+ { "overlap", "set number of block overlapping pixels", OFFSET(overlap), AV_OPT_TYPE_INT, {.i64=-1}, -1, (1<<MAX_NBITS)-1, .flags = FLAGS },
+ { "expr", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
+ { "e", "set coefficient factor expression", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
+ { "n", "set the block size, expressed in bits", OFFSET(n), AV_OPT_TYPE_INT, {.i64=DEFAULT_NBITS}, MIN_NBITS, MAX_NBITS, .flags = FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(dctdnoiz);
+
+static void av_always_inline fdct8_1d(float *dst, const float *src,
+ int dst_stridea, int dst_strideb,
+ int src_stridea, int src_strideb)
+{
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ const float x00 = src[0*src_stridea] + src[7*src_stridea];
+ const float x01 = src[1*src_stridea] + src[6*src_stridea];
+ const float x02 = src[2*src_stridea] + src[5*src_stridea];
+ const float x03 = src[3*src_stridea] + src[4*src_stridea];
+ const float x04 = src[0*src_stridea] - src[7*src_stridea];
+ const float x05 = src[1*src_stridea] - src[6*src_stridea];
+ const float x06 = src[2*src_stridea] - src[5*src_stridea];
+ const float x07 = src[3*src_stridea] - src[4*src_stridea];
+ const float x08 = x00 + x03;
+ const float x09 = x01 + x02;
+ const float x0a = x00 - x03;
+ const float x0b = x01 - x02;
+ const float x0c = 1.38703984532215f*x04 + 0.275899379282943f*x07;
+ const float x0d = 1.17587560241936f*x05 + 0.785694958387102f*x06;
+ const float x0e = -0.785694958387102f*x05 + 1.17587560241936f*x06;
+ const float x0f = 0.275899379282943f*x04 - 1.38703984532215f*x07;
+ const float x10 = 0.353553390593274f * (x0c - x0d);
+ const float x11 = 0.353553390593274f * (x0e - x0f);
+ dst[0*dst_stridea] = 0.353553390593274f * (x08 + x09);
+ dst[1*dst_stridea] = 0.353553390593274f * (x0c + x0d);
+ dst[2*dst_stridea] = 0.461939766255643f*x0a + 0.191341716182545f*x0b;
+ dst[3*dst_stridea] = 0.707106781186547f * (x10 - x11);
+ dst[4*dst_stridea] = 0.353553390593274f * (x08 - x09);
+ dst[5*dst_stridea] = 0.707106781186547f * (x10 + x11);
+ dst[6*dst_stridea] = 0.191341716182545f*x0a - 0.461939766255643f*x0b;
+ dst[7*dst_stridea] = 0.353553390593274f * (x0e + x0f);
+ dst += dst_strideb;
+ src += src_strideb;
+ }
+}
+
+static void av_always_inline idct8_1d(float *dst, const float *src,
+ int dst_stridea, int dst_strideb,
+ int src_stridea, int src_strideb,
+ int add)
+{
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ const float x00 = 1.4142135623731f *src[0*src_stridea];
+ const float x01 = 1.38703984532215f *src[1*src_stridea] + 0.275899379282943f*src[7*src_stridea];
+ const float x02 = 1.30656296487638f *src[2*src_stridea] + 0.541196100146197f*src[6*src_stridea];
+ const float x03 = 1.17587560241936f *src[3*src_stridea] + 0.785694958387102f*src[5*src_stridea];
+ const float x04 = 1.4142135623731f *src[4*src_stridea];
+ const float x05 = -0.785694958387102f*src[3*src_stridea] + 1.17587560241936f*src[5*src_stridea];
+ const float x06 = 0.541196100146197f*src[2*src_stridea] - 1.30656296487638f*src[6*src_stridea];
+ const float x07 = -0.275899379282943f*src[1*src_stridea] + 1.38703984532215f*src[7*src_stridea];
+ const float x09 = x00 + x04;
+ const float x0a = x01 + x03;
+ const float x0b = 1.4142135623731f*x02;
+ const float x0c = x00 - x04;
+ const float x0d = x01 - x03;
+ const float x0e = 0.353553390593274f * (x09 - x0b);
+ const float x0f = 0.353553390593274f * (x0c + x0d);
+ const float x10 = 0.353553390593274f * (x0c - x0d);
+ const float x11 = 1.4142135623731f*x06;
+ const float x12 = x05 + x07;
+ const float x13 = x05 - x07;
+ const float x14 = 0.353553390593274f * (x11 + x12);
+ const float x15 = 0.353553390593274f * (x11 - x12);
+ const float x16 = 0.5f*x13;
+ dst[0*dst_stridea] = (add ? dst[ 0*dst_stridea] : 0) + 0.25f * (x09 + x0b) + 0.353553390593274f*x0a;
+ dst[1*dst_stridea] = (add ? dst[ 1*dst_stridea] : 0) + 0.707106781186547f * (x0f + x15);
+ dst[2*dst_stridea] = (add ? dst[ 2*dst_stridea] : 0) + 0.707106781186547f * (x0f - x15);
+ dst[3*dst_stridea] = (add ? dst[ 3*dst_stridea] : 0) + 0.707106781186547f * (x0e + x16);
+ dst[4*dst_stridea] = (add ? dst[ 4*dst_stridea] : 0) + 0.707106781186547f * (x0e - x16);
+ dst[5*dst_stridea] = (add ? dst[ 5*dst_stridea] : 0) + 0.707106781186547f * (x10 - x14);
+ dst[6*dst_stridea] = (add ? dst[ 6*dst_stridea] : 0) + 0.707106781186547f * (x10 + x14);
+ dst[7*dst_stridea] = (add ? dst[ 7*dst_stridea] : 0) + 0.25f * (x09 + x0b) - 0.353553390593274f*x0a;
+ dst += dst_strideb;
+ src += src_strideb;
+ }
+}
+
+
+static void av_always_inline fdct16_1d(float *dst, const float *src,
+ int dst_stridea, int dst_strideb,
+ int src_stridea, int src_strideb)
+{
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ const float x00 = src[ 0*src_stridea] + src[15*src_stridea];
+ const float x01 = src[ 1*src_stridea] + src[14*src_stridea];
+ const float x02 = src[ 2*src_stridea] + src[13*src_stridea];
+ const float x03 = src[ 3*src_stridea] + src[12*src_stridea];
+ const float x04 = src[ 4*src_stridea] + src[11*src_stridea];
+ const float x05 = src[ 5*src_stridea] + src[10*src_stridea];
+ const float x06 = src[ 6*src_stridea] + src[ 9*src_stridea];
+ const float x07 = src[ 7*src_stridea] + src[ 8*src_stridea];
+ const float x08 = src[ 0*src_stridea] - src[15*src_stridea];
+ const float x09 = src[ 1*src_stridea] - src[14*src_stridea];
+ const float x0a = src[ 2*src_stridea] - src[13*src_stridea];
+ const float x0b = src[ 3*src_stridea] - src[12*src_stridea];
+ const float x0c = src[ 4*src_stridea] - src[11*src_stridea];
+ const float x0d = src[ 5*src_stridea] - src[10*src_stridea];
+ const float x0e = src[ 6*src_stridea] - src[ 9*src_stridea];
+ const float x0f = src[ 7*src_stridea] - src[ 8*src_stridea];
+ const float x10 = x00 + x07;
+ const float x11 = x01 + x06;
+ const float x12 = x02 + x05;
+ const float x13 = x03 + x04;
+ const float x14 = x00 - x07;
+ const float x15 = x01 - x06;
+ const float x16 = x02 - x05;
+ const float x17 = x03 - x04;
+ const float x18 = x10 + x13;
+ const float x19 = x11 + x12;
+ const float x1a = x10 - x13;
+ const float x1b = x11 - x12;
+ const float x1c = 1.38703984532215f*x14 + 0.275899379282943f*x17;
+ const float x1d = 1.17587560241936f*x15 + 0.785694958387102f*x16;
+ const float x1e = -0.785694958387102f*x15 + 1.17587560241936f *x16;
+ const float x1f = 0.275899379282943f*x14 - 1.38703984532215f *x17;
+ const float x20 = 0.25f * (x1c - x1d);
+ const float x21 = 0.25f * (x1e - x1f);
+ const float x22 = 1.40740373752638f *x08 + 0.138617169199091f*x0f;
+ const float x23 = 1.35331800117435f *x09 + 0.410524527522357f*x0e;
+ const float x24 = 1.24722501298667f *x0a + 0.666655658477747f*x0d;
+ const float x25 = 1.09320186700176f *x0b + 0.897167586342636f*x0c;
+ const float x26 = -0.897167586342636f*x0b + 1.09320186700176f *x0c;
+ const float x27 = 0.666655658477747f*x0a - 1.24722501298667f *x0d;
+ const float x28 = -0.410524527522357f*x09 + 1.35331800117435f *x0e;
+ const float x29 = 0.138617169199091f*x08 - 1.40740373752638f *x0f;
+ const float x2a = x22 + x25;
+ const float x2b = x23 + x24;
+ const float x2c = x22 - x25;
+ const float x2d = x23 - x24;
+ const float x2e = 0.25f * (x2a - x2b);
+ const float x2f = 0.326640741219094f*x2c + 0.135299025036549f*x2d;
+ const float x30 = 0.135299025036549f*x2c - 0.326640741219094f*x2d;
+ const float x31 = x26 + x29;
+ const float x32 = x27 + x28;
+ const float x33 = x26 - x29;
+ const float x34 = x27 - x28;
+ const float x35 = 0.25f * (x31 - x32);
+ const float x36 = 0.326640741219094f*x33 + 0.135299025036549f*x34;
+ const float x37 = 0.135299025036549f*x33 - 0.326640741219094f*x34;
+ dst[ 0*dst_stridea] = 0.25f * (x18 + x19);
+ dst[ 1*dst_stridea] = 0.25f * (x2a + x2b);
+ dst[ 2*dst_stridea] = 0.25f * (x1c + x1d);
+ dst[ 3*dst_stridea] = 0.707106781186547f * (x2f - x37);
+ dst[ 4*dst_stridea] = 0.326640741219094f*x1a + 0.135299025036549f*x1b;
+ dst[ 5*dst_stridea] = 0.707106781186547f * (x2f + x37);
+ dst[ 6*dst_stridea] = 0.707106781186547f * (x20 - x21);
+ dst[ 7*dst_stridea] = 0.707106781186547f * (x2e + x35);
+ dst[ 8*dst_stridea] = 0.25f * (x18 - x19);
+ dst[ 9*dst_stridea] = 0.707106781186547f * (x2e - x35);
+ dst[10*dst_stridea] = 0.707106781186547f * (x20 + x21);
+ dst[11*dst_stridea] = 0.707106781186547f * (x30 - x36);
+ dst[12*dst_stridea] = 0.135299025036549f*x1a - 0.326640741219094f*x1b;
+ dst[13*dst_stridea] = 0.707106781186547f * (x30 + x36);
+ dst[14*dst_stridea] = 0.25f * (x1e + x1f);
+ dst[15*dst_stridea] = 0.25f * (x31 + x32);
+ dst += dst_strideb;
+ src += src_strideb;
+ }
+}
+
+static void av_always_inline idct16_1d(float *dst, const float *src,
+ int dst_stridea, int dst_strideb,
+ int src_stridea, int src_strideb,
+ int add)
+{
+ int i;
+
+ for (i = 0; i < 16; i++) {
+ const float x00 = 1.4142135623731f *src[ 0*src_stridea];
+ const float x01 = 1.40740373752638f *src[ 1*src_stridea] + 0.138617169199091f*src[15*src_stridea];
+ const float x02 = 1.38703984532215f *src[ 2*src_stridea] + 0.275899379282943f*src[14*src_stridea];
+ const float x03 = 1.35331800117435f *src[ 3*src_stridea] + 0.410524527522357f*src[13*src_stridea];
+ const float x04 = 1.30656296487638f *src[ 4*src_stridea] + 0.541196100146197f*src[12*src_stridea];
+ const float x05 = 1.24722501298667f *src[ 5*src_stridea] + 0.666655658477747f*src[11*src_stridea];
+ const float x06 = 1.17587560241936f *src[ 6*src_stridea] + 0.785694958387102f*src[10*src_stridea];
+ const float x07 = 1.09320186700176f *src[ 7*src_stridea] + 0.897167586342636f*src[ 9*src_stridea];
+ const float x08 = 1.4142135623731f *src[ 8*src_stridea];
+ const float x09 = -0.897167586342636f*src[ 7*src_stridea] + 1.09320186700176f*src[ 9*src_stridea];
+ const float x0a = 0.785694958387102f*src[ 6*src_stridea] - 1.17587560241936f*src[10*src_stridea];
+ const float x0b = -0.666655658477747f*src[ 5*src_stridea] + 1.24722501298667f*src[11*src_stridea];
+ const float x0c = 0.541196100146197f*src[ 4*src_stridea] - 1.30656296487638f*src[12*src_stridea];
+ const float x0d = -0.410524527522357f*src[ 3*src_stridea] + 1.35331800117435f*src[13*src_stridea];
+ const float x0e = 0.275899379282943f*src[ 2*src_stridea] - 1.38703984532215f*src[14*src_stridea];
+ const float x0f = -0.138617169199091f*src[ 1*src_stridea] + 1.40740373752638f*src[15*src_stridea];
+ const float x12 = x00 + x08;
+ const float x13 = x01 + x07;
+ const float x14 = x02 + x06;
+ const float x15 = x03 + x05;
+ const float x16 = 1.4142135623731f*x04;
+ const float x17 = x00 - x08;
+ const float x18 = x01 - x07;
+ const float x19 = x02 - x06;
+ const float x1a = x03 - x05;
+ const float x1d = x12 + x16;
+ const float x1e = x13 + x15;
+ const float x1f = 1.4142135623731f*x14;
+ const float x20 = x12 - x16;
+ const float x21 = x13 - x15;
+ const float x22 = 0.25f * (x1d - x1f);
+ const float x23 = 0.25f * (x20 + x21);
+ const float x24 = 0.25f * (x20 - x21);
+ const float x25 = 1.4142135623731f*x17;
+ const float x26 = 1.30656296487638f*x18 + 0.541196100146197f*x1a;
+ const float x27 = 1.4142135623731f*x19;
+ const float x28 = -0.541196100146197f*x18 + 1.30656296487638f*x1a;
+ const float x29 = 0.176776695296637f * (x25 + x27) + 0.25f*x26;
+ const float x2a = 0.25f * (x25 - x27);
+ const float x2b = 0.176776695296637f * (x25 + x27) - 0.25f*x26;
+ const float x2c = 0.353553390593274f*x28;
+ const float x1b = 0.707106781186547f * (x2a - x2c);
+ const float x1c = 0.707106781186547f * (x2a + x2c);
+ const float x2d = 1.4142135623731f*x0c;
+ const float x2e = x0b + x0d;
+ const float x2f = x0a + x0e;
+ const float x30 = x09 + x0f;
+ const float x31 = x09 - x0f;
+ const float x32 = x0a - x0e;
+ const float x33 = x0b - x0d;
+ const float x37 = 1.4142135623731f*x2d;
+ const float x38 = 1.30656296487638f*x2e + 0.541196100146197f*x30;
+ const float x39 = 1.4142135623731f*x2f;
+ const float x3a = -0.541196100146197f*x2e + 1.30656296487638f*x30;
+ const float x3b = 0.176776695296637f * (x37 + x39) + 0.25f*x38;
+ const float x3c = 0.25f * (x37 - x39);
+ const float x3d = 0.176776695296637f * (x37 + x39) - 0.25f*x38;
+ const float x3e = 0.353553390593274f*x3a;
+ const float x34 = 0.707106781186547f * (x3c - x3e);
+ const float x35 = 0.707106781186547f * (x3c + x3e);
+ const float x3f = 1.4142135623731f*x32;
+ const float x40 = x31 + x33;
+ const float x41 = x31 - x33;
+ const float x42 = 0.25f * (x3f + x40);
+ const float x43 = 0.25f * (x3f - x40);
+ const float x44 = 0.353553390593274f*x41;
+ dst[ 0*dst_stridea] = (add ? dst[ 0*dst_stridea] : 0) + 0.176776695296637f * (x1d + x1f) + 0.25f*x1e;
+ dst[ 1*dst_stridea] = (add ? dst[ 1*dst_stridea] : 0) + 0.707106781186547f * (x29 + x3d);
+ dst[ 2*dst_stridea] = (add ? dst[ 2*dst_stridea] : 0) + 0.707106781186547f * (x29 - x3d);
+ dst[ 3*dst_stridea] = (add ? dst[ 3*dst_stridea] : 0) + 0.707106781186547f * (x23 - x43);
+ dst[ 4*dst_stridea] = (add ? dst[ 4*dst_stridea] : 0) + 0.707106781186547f * (x23 + x43);
+ dst[ 5*dst_stridea] = (add ? dst[ 5*dst_stridea] : 0) + 0.707106781186547f * (x1b - x35);
+ dst[ 6*dst_stridea] = (add ? dst[ 6*dst_stridea] : 0) + 0.707106781186547f * (x1b + x35);
+ dst[ 7*dst_stridea] = (add ? dst[ 7*dst_stridea] : 0) + 0.707106781186547f * (x22 + x44);
+ dst[ 8*dst_stridea] = (add ? dst[ 8*dst_stridea] : 0) + 0.707106781186547f * (x22 - x44);
+ dst[ 9*dst_stridea] = (add ? dst[ 9*dst_stridea] : 0) + 0.707106781186547f * (x1c + x34);
+ dst[10*dst_stridea] = (add ? dst[10*dst_stridea] : 0) + 0.707106781186547f * (x1c - x34);
+ dst[11*dst_stridea] = (add ? dst[11*dst_stridea] : 0) + 0.707106781186547f * (x24 + x42);
+ dst[12*dst_stridea] = (add ? dst[12*dst_stridea] : 0) + 0.707106781186547f * (x24 - x42);
+ dst[13*dst_stridea] = (add ? dst[13*dst_stridea] : 0) + 0.707106781186547f * (x2b - x3b);
+ dst[14*dst_stridea] = (add ? dst[14*dst_stridea] : 0) + 0.707106781186547f * (x2b + x3b);
+ dst[15*dst_stridea] = (add ? dst[15*dst_stridea] : 0) + 0.176776695296637f * (x1d + x1f) - 0.25f*x1e;
+ dst += dst_strideb;
+ src += src_strideb;
+ }
+}
+
+#define DEF_FILTER_FREQ_FUNCS(bsize) \
+static av_always_inline void filter_freq_##bsize(const float *src, int src_linesize, \
+ float *dst, int dst_linesize, \
+ AVExpr *expr, double *var_values, \
+ int sigma_th) \
+{ \
+ unsigned i; \
+ DECLARE_ALIGNED(32, float, tmp_block1)[bsize * bsize]; \
+ DECLARE_ALIGNED(32, float, tmp_block2)[bsize * bsize]; \
+ \
+ /* forward DCT */ \
+ fdct##bsize##_1d(tmp_block1, src, 1, bsize, 1, src_linesize); \
+ fdct##bsize##_1d(tmp_block2, tmp_block1, bsize, 1, bsize, 1); \
+ \
+ for (i = 0; i < bsize*bsize; i++) { \
+ float *b = &tmp_block2[i]; \
+ /* frequency filtering */ \
+ if (expr) { \
+ var_values[VAR_C] = FFABS(*b); \
+ *b *= av_expr_eval(expr, var_values, NULL); \
+ } else { \
+ if (FFABS(*b) < sigma_th) \
+ *b = 0; \
+ } \
+ } \
+ \
+ /* inverse DCT */ \
+ idct##bsize##_1d(tmp_block1, tmp_block2, 1, bsize, 1, bsize, 0); \
+ idct##bsize##_1d(dst, tmp_block1, dst_linesize, 1, bsize, 1, 1); \
+} \
+ \
+static void filter_freq_sigma_##bsize(DCTdnoizContext *s, \
+ const float *src, int src_linesize, \
+ float *dst, int dst_linesize, int thread_id) \
+{ \
+ filter_freq_##bsize(src, src_linesize, dst, dst_linesize, NULL, NULL, s->th); \
+} \
+ \
+static void filter_freq_expr_##bsize(DCTdnoizContext *s, \
+ const float *src, int src_linesize, \
+ float *dst, int dst_linesize, int thread_id) \
+{ \
+ filter_freq_##bsize(src, src_linesize, dst, dst_linesize, \
+ s->expr[thread_id], s->var_values[thread_id], 0); \
+}
+
+DEF_FILTER_FREQ_FUNCS(8)
+DEF_FILTER_FREQ_FUNCS(16)
+
+#define DCT3X3_0_0 0.5773502691896258f /* 1/sqrt(3) */
+#define DCT3X3_0_1 0.5773502691896258f /* 1/sqrt(3) */
+#define DCT3X3_0_2 0.5773502691896258f /* 1/sqrt(3) */
+#define DCT3X3_1_0 0.7071067811865475f /* 1/sqrt(2) */
+#define DCT3X3_1_2 -0.7071067811865475f /* -1/sqrt(2) */
+#define DCT3X3_2_0 0.4082482904638631f /* 1/sqrt(6) */
+#define DCT3X3_2_1 -0.8164965809277261f /* -2/sqrt(6) */
+#define DCT3X3_2_2 0.4082482904638631f /* 1/sqrt(6) */
+
+static av_always_inline void color_decorrelation(float **dst, int dst_linesize,
+ const uint8_t *src, int src_linesize,
+ int w, int h,
+ int r, int g, int b)
+{
+ int x, y;
+ float *dstp_r = dst[0];
+ float *dstp_g = dst[1];
+ float *dstp_b = dst[2];
+
+ for (y = 0; y < h; y++) {
+ const uint8_t *srcp = src;
+
+ for (x = 0; x < w; x++) {
+ dstp_r[x] = srcp[r] * DCT3X3_0_0 + srcp[g] * DCT3X3_0_1 + srcp[b] * DCT3X3_0_2;
+ dstp_g[x] = srcp[r] * DCT3X3_1_0 + srcp[b] * DCT3X3_1_2;
+ dstp_b[x] = srcp[r] * DCT3X3_2_0 + srcp[g] * DCT3X3_2_1 + srcp[b] * DCT3X3_2_2;
+ srcp += 3;
+ }
+ src += src_linesize;
+ dstp_r += dst_linesize;
+ dstp_g += dst_linesize;
+ dstp_b += dst_linesize;
+ }
+}
+
+static av_always_inline void color_correlation(uint8_t *dst, int dst_linesize,
+ float **src, int src_linesize,
+ int w, int h,
+ int r, int g, int b)
+{
+ int x, y;
+ const float *src_r = src[0];
+ const float *src_g = src[1];
+ const float *src_b = src[2];
+
+ for (y = 0; y < h; y++) {
+ uint8_t *dstp = dst;
+
+ for (x = 0; x < w; x++) {
+ dstp[r] = av_clip_uint8(src_r[x] * DCT3X3_0_0 + src_g[x] * DCT3X3_1_0 + src_b[x] * DCT3X3_2_0);
+ dstp[g] = av_clip_uint8(src_r[x] * DCT3X3_0_1 + src_b[x] * DCT3X3_2_1);
+ dstp[b] = av_clip_uint8(src_r[x] * DCT3X3_0_2 + src_g[x] * DCT3X3_1_2 + src_b[x] * DCT3X3_2_2);
+ dstp += 3;
+ }
+ dst += dst_linesize;
+ src_r += src_linesize;
+ src_g += src_linesize;
+ src_b += src_linesize;
+ }
+}
+
+#define DECLARE_COLOR_FUNCS(name, r, g, b) \
+static void color_decorrelation_##name(float **dst, int dst_linesize, \
+ const uint8_t *src, int src_linesize, \
+ int w, int h) \
+{ \
+ color_decorrelation(dst, dst_linesize, src, src_linesize, w, h, r, g, b); \
+} \
+ \
+static void color_correlation_##name(uint8_t *dst, int dst_linesize, \
+ float **src, int src_linesize, \
+ int w, int h) \
+{ \
+ color_correlation(dst, dst_linesize, src, src_linesize, w, h, r, g, b); \
+}
+
+DECLARE_COLOR_FUNCS(rgb, 0, 1, 2)
+DECLARE_COLOR_FUNCS(bgr, 2, 1, 0)
+
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ DCTdnoizContext *s = ctx->priv;
+ int i, x, y, bx, by, linesize, *iweights, max_slice_h, slice_h;
+ const int bsize = 1 << s->n;
+
+ switch (inlink->format) {
+ case AV_PIX_FMT_BGR24:
+ s->color_decorrelation = color_decorrelation_bgr;
+ s->color_correlation = color_correlation_bgr;
+ break;
+ case AV_PIX_FMT_RGB24:
+ s->color_decorrelation = color_decorrelation_rgb;
+ s->color_correlation = color_correlation_rgb;
+ break;
+ default:
+ av_assert0(0);
+ }
+
+ s->pr_width = inlink->w - (inlink->w - bsize) % s->step;
+ s->pr_height = inlink->h - (inlink->h - bsize) % s->step;
+ if (s->pr_width != inlink->w)
+ av_log(ctx, AV_LOG_WARNING, "The last %d horizontal pixels won't be denoised\n",
+ inlink->w - s->pr_width);
+ if (s->pr_height != inlink->h)
+ av_log(ctx, AV_LOG_WARNING, "The last %d vertical pixels won't be denoised\n",
+ inlink->h - s->pr_height);
+
+ max_slice_h = s->pr_height / ((s->bsize - 1) * 2);
+ s->nb_threads = FFMIN3(MAX_THREADS, ctx->graph->nb_threads, max_slice_h);
+ av_log(ctx, AV_LOG_DEBUG, "threads: [max=%d hmax=%d user=%d] => %d\n",
+ MAX_THREADS, max_slice_h, ctx->graph->nb_threads, s->nb_threads);
+
+ s->p_linesize = linesize = FFALIGN(s->pr_width, 32);
+ for (i = 0; i < 2; i++) {
+ s->cbuf[i][0] = av_malloc_array(linesize * s->pr_height, sizeof(*s->cbuf[i][0]));
+ s->cbuf[i][1] = av_malloc_array(linesize * s->pr_height, sizeof(*s->cbuf[i][1]));
+ s->cbuf[i][2] = av_malloc_array(linesize * s->pr_height, sizeof(*s->cbuf[i][2]));
+ if (!s->cbuf[i][0] || !s->cbuf[i][1] || !s->cbuf[i][2])
+ return AVERROR(ENOMEM);
+ }
+
+ /* eval expressions are probably not thread safe when the eval internal
+ * state can be changed (typically through load & store operations) */
+ if (s->expr_str) {
+ for (i = 0; i < s->nb_threads; i++) {
+ int ret = av_expr_parse(&s->expr[i], s->expr_str, var_names,
+ NULL, NULL, NULL, NULL, 0, ctx);
+ if (ret < 0)
+ return ret;
+ }
+ }
+
+ /* each slice will need to (pre & re)process the top and bottom block of
+ * the previous one in in addition to its processing area. This is because
+ * each pixel is averaged by all the surrounding blocks */
+ slice_h = (int)ceilf(s->pr_height / (float)s->nb_threads) + (s->bsize - 1) * 2;
+ for (i = 0; i < s->nb_threads; i++) {
+ s->slices[i] = av_malloc_array(linesize, slice_h * sizeof(*s->slices[i]));
+ if (!s->slices[i])
+ return AVERROR(ENOMEM);
+ }
+
+ s->weights = av_malloc(s->pr_height * linesize * sizeof(*s->weights));
+ if (!s->weights)
+ return AVERROR(ENOMEM);
+ iweights = av_calloc(s->pr_height, linesize * sizeof(*iweights));
+ if (!iweights)
+ return AVERROR(ENOMEM);
+ for (y = 0; y < s->pr_height - bsize + 1; y += s->step)
+ for (x = 0; x < s->pr_width - bsize + 1; x += s->step)
+ for (by = 0; by < bsize; by++)
+ for (bx = 0; bx < bsize; bx++)
+ iweights[(y + by)*linesize + x + bx]++;
+ for (y = 0; y < s->pr_height; y++)
+ for (x = 0; x < s->pr_width; x++)
+ s->weights[y*linesize + x] = 1. / iweights[y*linesize + x];
+ av_free(iweights);
+
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ DCTdnoizContext *s = ctx->priv;
+
+ s->bsize = 1 << s->n;
+ if (s->overlap == -1)
+ s->overlap = s->bsize - 1;
+
+ if (s->overlap > s->bsize - 1) {
+ av_log(s, AV_LOG_ERROR, "Overlap value can not except %d "
+ "with a block size of %dx%d\n",
+ s->bsize - 1, s->bsize, s->bsize);
+ return AVERROR(EINVAL);
+ }
+
+ if (s->expr_str) {
+ switch (s->n) {
+ case 3: s->filter_freq_func = filter_freq_expr_8; break;
+ case 4: s->filter_freq_func = filter_freq_expr_16; break;
+ default: av_assert0(0);
+ }
+ } else {
+ switch (s->n) {
+ case 3: s->filter_freq_func = filter_freq_sigma_8; break;
+ case 4: s->filter_freq_func = filter_freq_sigma_16; break;
+ default: av_assert0(0);
+ }
+ }
+
+ s->th = s->sigma * 3.;
+ s->step = s->bsize - s->overlap;
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_BGR24, AV_PIX_FMT_RGB24,
+ AV_PIX_FMT_NONE
+ };
+ ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+ return 0;
+}
+
+typedef struct ThreadData {
+ float *src, *dst;
+} ThreadData;
+
+static int filter_slice(AVFilterContext *ctx,
+ void *arg, int jobnr, int nb_jobs)
+{
+ int x, y;
+ DCTdnoizContext *s = ctx->priv;
+ const ThreadData *td = arg;
+ const int w = s->pr_width;
+ const int h = s->pr_height;
+ const int slice_start = (h * jobnr ) / nb_jobs;
+ const int slice_end = (h * (jobnr+1)) / nb_jobs;
+ const int slice_start_ctx = FFMAX(slice_start - s->bsize + 1, 0);
+ const int slice_end_ctx = FFMIN(slice_end, h - s->bsize + 1);
+ const int slice_h = slice_end_ctx - slice_start_ctx;
+ const int src_linesize = s->p_linesize;
+ const int dst_linesize = s->p_linesize;
+ const int slice_linesize = s->p_linesize;
+ float *dst;
+ const float *src = td->src + slice_start_ctx * src_linesize;
+ const float *weights = s->weights + slice_start * dst_linesize;
+ float *slice = s->slices[jobnr];
+
+ // reset block sums
+ memset(slice, 0, (slice_h + s->bsize - 1) * dst_linesize * sizeof(*slice));
+
+ // block dct sums
+ for (y = 0; y < slice_h; y += s->step) {
+ for (x = 0; x < w - s->bsize + 1; x += s->step)
+ s->filter_freq_func(s, src + x, src_linesize,
+ slice + x, slice_linesize,
+ jobnr);
+ src += s->step * src_linesize;
+ slice += s->step * slice_linesize;
+ }
+
+ // average blocks
+ slice = s->slices[jobnr] + (slice_start - slice_start_ctx) * slice_linesize;
+ dst = td->dst + slice_start * dst_linesize;
+ for (y = slice_start; y < slice_end; y++) {
+ for (x = 0; x < w; x++)
+ dst[x] = slice[x] * weights[x];
+ slice += slice_linesize;
+ dst += dst_linesize;
+ weights += dst_linesize;
+ }
+
+ return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ DCTdnoizContext *s = ctx->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ int direct, plane;
+ AVFrame *out;
+
+ if (av_frame_is_writable(in)) {
+ direct = 1;
+ out = in;
+ } else {
+ direct = 0;
+ 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);
+ }
+
+ s->color_decorrelation(s->cbuf[0], s->p_linesize,
+ in->data[0], in->linesize[0],
+ s->pr_width, s->pr_height);
+ for (plane = 0; plane < 3; plane++) {
+ ThreadData td = {
+ .src = s->cbuf[0][plane],
+ .dst = s->cbuf[1][plane],
+ };
+ ctx->internal->execute(ctx, filter_slice, &td, NULL, s->nb_threads);
+ }
+ s->color_correlation(out->data[0], out->linesize[0],
+ s->cbuf[1], s->p_linesize,
+ s->pr_width, s->pr_height);
+
+ if (!direct) {
+ int y;
+ uint8_t *dst = out->data[0];
+ const uint8_t *src = in->data[0];
+ const int dst_linesize = out->linesize[0];
+ const int src_linesize = in->linesize[0];
+ const int hpad = (inlink->w - s->pr_width) * 3;
+ const int vpad = (inlink->h - s->pr_height);
+
+ if (hpad) {
+ uint8_t *dstp = dst + s->pr_width * 3;
+ const uint8_t *srcp = src + s->pr_width * 3;
+
+ for (y = 0; y < s->pr_height; y++) {
+ memcpy(dstp, srcp, hpad);
+ dstp += dst_linesize;
+ srcp += src_linesize;
+ }
+ }
+ if (vpad) {
+ uint8_t *dstp = dst + s->pr_height * dst_linesize;
+ const uint8_t *srcp = src + s->pr_height * src_linesize;
+
+ for (y = 0; y < vpad; y++) {
+ memcpy(dstp, srcp, inlink->w * 3);
+ dstp += dst_linesize;
+ srcp += src_linesize;
+ }
+ }
+
+ av_frame_free(&in);
+ }
+
+ return ff_filter_frame(outlink, out);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ int i;
+ DCTdnoizContext *s = ctx->priv;
+
+ av_freep(&s->weights);
+ for (i = 0; i < 2; i++) {
+ av_freep(&s->cbuf[i][0]);
+ av_freep(&s->cbuf[i][1]);
+ av_freep(&s->cbuf[i][2]);
+ }
+ for (i = 0; i < s->nb_threads; i++) {
+ av_freep(&s->slices[i]);
+ av_expr_free(s->expr[i]);
+ }
+}
+
+static const AVFilterPad dctdnoiz_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .filter_frame = filter_frame,
+ .config_props = config_input,
+ },
+ { NULL }
+};
+
+static const AVFilterPad dctdnoiz_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_dctdnoiz = {
+ .name = "dctdnoiz",
+ .description = NULL_IF_CONFIG_SMALL("Denoise frames using 2D DCT."),
+ .priv_size = sizeof(DCTdnoizContext),
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = dctdnoiz_inputs,
+ .outputs = dctdnoiz_outputs,
+ .priv_class = &dctdnoiz_class,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 20:49:07 +0000