From bf8ac38cee36886f6c317681a16aecfa5dee0752 Mon Sep 17 00:00:00 2001
From: MinaBombo <minasamy_@hotmail.com>
Date: Sat, 24 Mar 2018 21:15:08 +0200
Subject: [PATCH] Added srcnn filter

---
 Changelog                   |   1 +
 libavfilter/Makefile        |   1 +
 libavfilter/allfilters.c    |   1 +
 libavfilter/srcnn_weights.h | 290 ++++++++++++++++++++++++++++++++++++++++++++
 libavfilter/vf_srcnn.c      | 264 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 557 insertions(+)
 create mode 100644 libavfilter/srcnn_weights.h
 create mode 100644 libavfilter/vf_srcnn.c

diff --git a/Changelog b/Changelog
index c1b9df4..e153f12 100644
--- a/Changelog
+++ b/Changelog
@@ -46,6 +46,7 @@ version <next>:
   They can be found at http://git.videolan.org/?p=ffmpeg/nv-codec-headers.git
 - native SBC encoder and decoder
 - drmeter audio filter
+- Added image SRCNN(Super Resolution Convolutional Neural Network) filter. No training yet.
 
 
 version 3.4:
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index fc16512..b37a956 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -323,6 +323,7 @@ OBJS-$(CONFIG_SMARTBLUR_FILTER)              += vf_smartblur.o
 OBJS-$(CONFIG_SOBEL_FILTER)                  += vf_convolution.o
 OBJS-$(CONFIG_SPLIT_FILTER)                  += split.o
 OBJS-$(CONFIG_SPP_FILTER)                    += vf_spp.o
+OBJS-$(CONFIG_SRCNN_FILTER)                  += vf_srcnn.o
 OBJS-$(CONFIG_SSIM_FILTER)                   += vf_ssim.o framesync.o
 OBJS-$(CONFIG_STEREO3D_FILTER)               += vf_stereo3d.o
 OBJS-$(CONFIG_STREAMSELECT_FILTER)           += f_streamselect.o framesync.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index cc423af..42f409c 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -332,6 +332,7 @@ static void register_all(void)
     REGISTER_FILTER(SOBEL,          sobel,          vf);
     REGISTER_FILTER(SPLIT,          split,          vf);
     REGISTER_FILTER(SPP,            spp,            vf);
+    REGISTER_FILTER(SRCNN,          srcnn,          vf);
     REGISTER_FILTER(SSIM,           ssim,           vf);
     REGISTER_FILTER(STEREO3D,       stereo3d,       vf);
     REGISTER_FILTER(STREAMSELECT,   streamselect,   vf);
diff --git a/libavfilter/srcnn_weights.h b/libavfilter/srcnn_weights.h
new file mode 100644
index 0000000..d6ac79c
--- /dev/null
+++ b/libavfilter/srcnn_weights.h
@@ -0,0 +1,290 @@
+/*
+ * Copyright (c) 2018 Mina Sami
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Super resolution filter pretrained weights
+ *
+ * @see https://arxiv.org/abs/1501.00092
+ */
+
+#ifndef AVFILTER_SRCNN_WEIGHTS_H
+#define AVFILTER_SRCNN_WEIGHTS_H
+
+const int ff_cnn_num_filters[] = {
+    1, 64, 32, 1
+};
+
+const int ff_cnn_size_filters[] = {
+    1, 9, 1, 5
+};
+
+static const float weights1_64x81[] = {
+    -0.088663,0.05541,0.037197,-0.11961,-0.12342,0.29963,-0.091182,-0.00013614,-0.049024,0.038421,-0.077268,0.027273,0.45762,0.023582,-0.20364,-0.077384,0.072884,0.066799,-0.073151,0.26653,0.078364,-0.28985,-0.50691,0.044665,-0.062469,-0.024425,-0.029073,-0.16885,0.20686,-0.25367,-0.385,-0.12602,0.72579,0.095884,-0.044873,-0.011252,-0.029559,0.22117,-0.38453,-0.05351,0.10956,0.37257,-0.28968,-0.10884,0.19629,0.097468,-0.0056471,-0.13036,0.62543,0.19104,-0.011692,-0.27068,-0.030754,0.029876,0.016809,-0.18318,-0.16016,0.35983,-0.1889,-0.22343,-0.11112,0.32211,-0.18514,-0.06647,0.18006,-0.03566,-0.25352,-0.1837,0.28395,0.0030237,0.24073,-0.14355,0.047419,-0.032212,-0.088013,0.29592,0.041087,-0.10354,-0.11681,-0.010267,0.023704,
+    -0.043954,0.095339,0.12234,-0.052115,0.068812,0.057649,0.086867,-0.12001,0.023536,-0.022271,-0.063779,0.010644,-0.27824,-0.2372,-0.21418,-0.09665,0.10459,0.065994,-0.031174,-0.034654,0.022144,-0.24322,-0.089236,-0.027248,-0.093149,-0.03741,0.078197,0.12521,0.1119,0.34982,0.24304,0.21351,0.37121,0.12193,-0.15492,0.01884,-0.083511,-0.3055,-0.11462,-0.11834,-0.35028,-0.0077491,-0.051849,-0.14424,-0.040476,0.18358,0.16708,0.074863,0.17893,0.12331,0.16825,-0.040669,0.12499,0.12445,-0.085298,-0.23087,-0.24264,-0.0033643,-0.019014,0.0074067,-0.097625,0.097274,-0.14308,0.20925,0.047316,0.17839,0.20143,-0.21384,-0.16858,0.077692,0.11478,0.0022495,-0.095247,-0.11904,-0.11904,0.11935,0.040787,-0.078733,0.19329,-0.060085,-0.036192,
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+};
+
+static const float weights2_32x64x1[] = {
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+};
+
+static const float weights3_32x25[] = {
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+    -0.019966,-0.0019774,0.0098074,-0.0052229,0.0057441,0.021809,-0.014543,-0.01105,-0.023863,0.01249,0.021637,-0.04904,0.11622,-0.052713,0.013106,-0.0019236,-0.02419,-0.03459,-0.0095198,0.017527,-0.0016539,0.0079173,0.025195,0.0050018,-0.018865,
+    0.0079919,-0.0099945,0.013966,0.0034037,0.0044098,-0.0011488,-0.01298,0.021291,-0.011861,-0.0056803,-0.019348,0.017518,0.055704,-0.0082341,-0.032455,-0.026378,-0.0060074,0.034043,0.00060863,-0.0060978,0.010704,-0.010331,0.0025184,0.00020402,0.0091586,
+    -0.0046207,-0.019019,-0.0039543,-0.0057573,-0.0028753,-0.0041014,-0.01211,0.017782,-0.0093694,-0.010443,-0.011709,0.029355,0.061708,0.018863,0.00014959,-0.017802,-0.013039,0.009691,-0.015811,-0.0072428,0.011613,-0.0081831,-0.0049616,-0.0081696,-0.011142,
+    0.011911,-0.014209,-0.002595,3.0099e-05,0.037273,-0.00041378,0.0056974,0.023486,-0.011684,0.016428,-0.014264,0.012375,0.055691,0.0092182,-0.018465,-0.0063814,0.0067027,0.018198,-0.013824,-0.0060196,0.030274,-0.0030317,-0.010555,-0.021851,0.0050981,
+    0.0043943,-0.010815,-0.010605,-0.016694,-0.0079704,-0.0025396,-0.011344,0.016261,-0.0027838,-0.0099353,-0.011821,0.021071,0.050107,0.018654,-0.0040784,-0.018069,-0.012078,0.018704,-0.0050004,0.00083424,0.0045916,-0.018925,-0.010357,0.0080302,0.01289,
+    -0.015275,-0.012636,-0.022159,-0.026578,-0.023842,-0.017456,-0.0062731,0.024738,0.0015959,-0.022227,0.0029874,0.043246,0.053597,0.018533,0.0037152,-0.0036655,-0.00073221,0.0041338,-0.027597,-0.023045,-0.02433,-0.025037,0.0054867,-0.0050565,-0.019689,
+    0.0070589,-0.025711,-0.040492,-0.055859,-0.020695,-0.016486,-0.020269,0.065497,0.013797,0.01565,-0.043466,-0.0017072,0.11819,0.019084,-0.034191,0.013736,0.0034031,0.012773,-0.047303,-0.013992,-0.014096,-0.018174,-0.021662,-0.024148,0.0028594,
+    0.01029,-0.011209,-0.0082667,-0.010408,0.018301,0.0025677,0.002066,0.020338,-0.009703,0.0014033,-0.0083895,0.019171,0.051874,0.011865,-0.012415,-0.0092653,-0.00085054,0.013343,-0.01754,-0.002096,0.018685,-0.0089012,-0.011406,-0.013634,0.0053699,
+    0.013065,0.0061852,-0.01931,-0.024492,-0.0013983,0.0073914,-0.0066272,0.017187,-0.016293,-0.026624,-0.020286,0.02005,0.053055,0.020338,0.020487,-0.027791,-0.017894,-0.0101,-0.041414,0.011034,0.0088582,-0.006475,-0.0068052,0.0064488,-0.0042941,
+    -0.010343,-0.028723,-0.0053983,-0.01374,-0.029326,-0.049815,-0.036355,-0.0055914,-0.0022775,-0.007203,0.018381,0.044325,0.094884,0.045083,0.0046755,-0.012576,0.027413,0.015592,-0.041248,-0.024964,-0.048041,-0.04541,-0.0043235,-0.029982,-0.014502,
+    0.017746,-0.015992,-0.027176,-0.0016935,0.039605,-0.008181,-0.0098833,-0.030282,-0.058384,0.025399,0.0094021,0.00035681,0.05972,0.02304,-0.0017117,0.043335,-0.039493,-0.031008,-0.012798,-0.01464,0.016878,0.007166,-0.0074393,-0.037354,0.014149,
+    -4.6093e-06,-7.2622e-06,-7.6834e-06,-6.9714e-06,-5e-06,-5.9784e-06,-6.2109e-06,-3.9642e-06,-5.6584e-06,-6.0324e-06,-6.4926e-06,-3.7826e-06,0.03125,-2.3969e-06,-5.6997e-06,-7.0378e-06,-7.2416e-06,-4.1644e-06,-5.4397e-06,-5.8029e-06,-5.1983e-06,-7.5856e-06,-7.7238e-06,-6.9213e-06,-4.7263e-06,
+    -0.0030044,0.0059219,0.0058844,0.016727,0.0021213,0.017586,-0.02644,-0.0401,-0.010032,0.022034,0.023732,-0.05497,0.092623,-0.033417,-0.016189,0.026427,-0.019933,-0.023361,-0.0086142,0.013127,0.0072843,0.00128,-0.021759,0.033992,0.0038339,
+    0.004238,-0.012754,-0.0025555,0.012803,0.017022,-0.011831,-0.028892,-0.023674,-0.051561,0.02422,-0.012512,0.00025987,0.071229,0.0004289,0.00093794,0.0057987,-0.053384,-0.0073699,0.0048934,-0.012663,0.0059655,0.00069129,0.0082262,-0.004451,0.012931,
+    0.011624,0.0046318,0.0031521,0.0015066,0.0030794,0.011075,-0.0013151,0.0031256,-0.0016375,-0.0024924,0.0038245,-0.0030981,0.035595,-0.00082805,-0.0044747,0.0013659,-0.0054627,-0.0021892,-0.0032666,-0.00088623,0.005186,0.005903,0.0066537,0.0042462,0.0046949,
+    0.0042922,-0.012866,0.0077376,-0.0092877,0.0041404,-0.018346,-0.023602,0.0036819,-0.033829,-0.0025713,-0.0096208,0.042019,0.10133,0.010724,0.015642,-0.014492,-0.0099553,-0.004158,-0.047724,0.001651,0.0015475,-0.0043672,-0.0085801,-0.032517,0.013099,
+    0.0036017,-0.015348,-0.0016007,-0.026466,-0.024156,-0.028922,-0.010726,0.035655,-0.01486,-0.024257,-0.072175,-0.014718,0.033047,0.0077159,-0.03106,-0.016381,-0.045895,0.040367,-0.029738,-0.045123,0.0014243,-0.024956,0.034193,-0.010747,-0.015423,
+};
+
+
+static const float biases1_64[] = {
+    -0.016607,
+    -0.011107,
+    -0.004831,
+    -0.048674,
+    -0.030041,
+    -0.072972,
+    -0.019459,
+    -0.009738,
+    0.69512,
+    -0.073694,
+    -0.013542,
+    0.010336,
+    -0.029562,
+    0.018691,
+    -0.021675,
+    0.0040888,
+    -0.080331,
+    -0.020802,
+    -0.00025044,
+    0.015666,
+    -0.02444,
+    -0.00014609,
+    -5.0048e-05,
+    -0.0011854,
+    -8.3538e-05,
+    0,
+    -0.00037627,
+    0.029716,
+    -9.9403e-05,
+    -0.020137,
+    -0.00029498,
+    0.019286,
+    0.0055777,
+    -0.070032,
+    -0.024399,
+    -1.7727e-05,
+    0.0050997,
+    -0.011212,
+    0.0045361,
+    -0.024612,
+    -0.022536,
+    -0.00016232,
+    -0.00017363,
+    -1.5526e-05,
+    -0.065597,
+    -0.0065806,
+    6.6839e-06,
+    0.025229,
+    -0.0013731,
+    0.030352,
+    0,
+    0.0032856,
+    0.0055279,
+    0.020767,
+    -0.0084906,
+    0.026332,
+    -0.04679,
+    0.01033,
+    -0.023649,
+    0.027852,
+    0.054407,
+    -0.080683,
+    -0.0094465,
+    -0.046632,
+};
+
+
+static const float biases2_32[] = {
+    0.12326,
+    0.13271,
+    0.070827,
+    0.051456,
+    0.058446,
+    0.13153,
+    0.080973,
+    0.10153,
+    0.055915,
+    0.052282,
+    -0.11213,
+    0.074621,
+    -0.10301,
+    0.10818,
+    0.15687,
+    0.18226,
+    0.06781,
+    -0.027867,
+    0.10958,
+    0.034253,
+    0.059884,
+    -0.048186,
+    0.074781,
+    -0.073381,
+    -0.022101,
+    -0.049476,
+    0.00016185,
+    0.16787,
+    -0.086404,
+    0.060469,
+    -0.17338,
+    0.2655,
+};
+
+static const float biases3_1[] = {0.050377};
+
+const float *ff_cnn_weights[] = {
+    NULL, weights1_64x81, weights2_32x64x1, weights3_32x25
+};
+
+const float *ff_cnn_biases[] = {
+    NULL, biases1_64, biases2_32, biases3_1
+};
+
+#endif /* AVFILTER_SRCNN_WEIGHTS_H */
\ No newline at end of file
diff --git a/libavfilter/vf_srcnn.c b/libavfilter/vf_srcnn.c
new file mode 100644
index 0000000..3533e46
--- /dev/null
+++ b/libavfilter/vf_srcnn.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 2018 Mina Sami
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * Super resolution filter
+ *
+ * @see https://arxiv.org/abs/1501.00092
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "srcnn_weights.h"
+#include "video.h"
+
+#define NUM_LAYERS 3
+
+typedef float** Kernel;
+
+typedef struct CNNLayer {
+    int num_filters, size_filter;
+    int in_num_filters;
+    Kernel **weights;
+    float *biases;
+    float **out;
+} CNNLayer;
+
+typedef struct SRCNNContext {
+    const AVClass *class;
+
+    CNNLayer layers[NUM_LAYERS+1];
+} SRCNNContext;
+
+static const AVOption srcnn_options[] = {
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(srcnn);
+
+static Kernel srcnn_malloc_kernel(int size)
+{
+    Kernel kernel;
+    int i;
+
+    if (!(kernel = av_malloc_array(size, sizeof(float*))))
+        return NULL;
+    for (i=0; i<size; ++i)
+        if (!(kernel[i] = av_malloc_array(size, sizeof(float))))
+            return NULL;
+    return kernel;
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    SRCNNContext *srcnn = ctx->priv;
+    int index, l, cf, pf, r, c;
+
+    for (l=1; l<=NUM_LAYERS; ++l) {
+        srcnn->layers[l].num_filters = ff_cnn_num_filters[l];
+        srcnn->layers[l].size_filter = ff_cnn_size_filters[l];
+        srcnn->layers[l].in_num_filters = ff_cnn_num_filters[l-1];
+
+        if (!(srcnn->layers[l].weights = av_malloc_array(srcnn->layers[l].num_filters, sizeof(Kernel*))))
+            return AVERROR(ENOMEM);
+        for (cf=0; cf<srcnn->layers[l].num_filters; ++cf) {
+            if (!(srcnn->layers[l].weights[cf] = av_malloc_array(srcnn->layers[l].in_num_filters, sizeof(Kernel) )))
+                return AVERROR(ENOMEM);
+            for (pf=0; pf<srcnn->layers[l].in_num_filters; ++pf)
+                if (!(srcnn->layers[l].weights[cf][pf] = srcnn_malloc_kernel(srcnn->layers[l].size_filter)))
+                    return AVERROR(ENOMEM);
+        }
+        index = 0;
+        for (cf=0; cf<srcnn->layers[l].num_filters; ++cf)
+            for (pf=0; pf<srcnn->layers[l].in_num_filters; ++pf)
+                for (r=0; r<srcnn->layers[l].size_filter; ++r)
+                    for (c=0; c<srcnn->layers[l].size_filter; ++c)
+                        srcnn->layers[l].weights[cf][pf][r][c] = ff_cnn_weights[l][index++];
+
+        if (!(srcnn->layers[l].biases = av_malloc_array(srcnn->layers[l].num_filters, sizeof(float) )))
+            return AVERROR(ENOMEM);
+        memcpy(srcnn->layers[l].biases, ff_cnn_biases[l], srcnn->layers[l].num_filters);
+    }
+
+    return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum AVPixelFormat pix_fmts[] = {
+        AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P,
+        AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
+        AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
+        AV_PIX_FMT_NONE
+    };
+
+    return ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+}
+
+static int config_props(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    SRCNNContext *srcnn = ctx->priv;
+    int l, f;
+
+    for (l=1; l<=NUM_LAYERS; ++l) {
+        if (!(srcnn->layers[l].out = av_malloc_array(srcnn->layers[l].num_filters, sizeof(float*) )))
+            return AVERROR(ENOMEM);
+        for (f=0; f<srcnn->layers[l].num_filters; ++f)
+            if (!(srcnn->layers[l].out[f] = av_malloc_array(inlink->w*inlink->h, sizeof(float) )))
+                return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+#define THRESHOLD(val, thresh_min, thresh_max)({\
+    val = val < thresh_min ? thresh_min : val;\
+    val = val > thresh_max ? thresh_max : val;\
+})
+
+enum ConvDataType {
+    CONV_FLOAT,
+    CONV_UINT8
+};
+
+static void convolute(float *dst, const void **src, enum ConvDataType src_dt,
+                      int n, int w, int h, int dst_linesize, int src_linesize,
+                      int kernelsize, Kernel *kernel, float bias) {
+    int pivot = (kernelsize+1)>>2;
+    int rel_beg = -pivot;
+    int src_ind, src_rind, src_cind;
+    int row, col, i, j, k;
+    bias *= 255.0;
+
+    for (row=0; row<h; ++row) {
+        for (col=0; col<w; ++col) {
+            for (i=rel_beg; pivot+i<kernelsize; ++i) {
+                for (j=rel_beg; pivot+j<kernelsize; ++j) {
+                    src_rind = row + i;
+                    THRESHOLD(src_rind, 0, h-1);
+                    src_cind = col + j;
+                    THRESHOLD(src_cind, 0, w-1);
+                    src_ind = src_rind*src_linesize + src_cind;
+                    for (k=0; k<n; ++k) {
+                        switch (src_dt) {
+                        case CONV_FLOAT:
+                            dst[col] += (((float**)src)[k][src_ind] * kernel[k][pivot+i][pivot+j]);
+                            break;
+                        case CONV_UINT8:
+                            dst[col] += (((uint8_t**)src)[k][src_ind] * kernel[k][pivot+i][pivot+j]);
+                            break;
+                        }
+                    }
+                }
+            }
+            dst[col] += bias;
+            dst[col] = FFMAX(0, dst[col]);
+        }
+        dst += dst_linesize;
+    }
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in) {
+    AVFilterContext *ctx = inlink->dst;
+    SRCNNContext *srcnn = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFrame *out;
+    int cf, l, i, j;
+
+    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);
+
+    for (cf=0; cf<srcnn->layers[1].num_filters; ++cf)
+        convolute(srcnn->layers[1].out[cf], (const void **)&in->data, CONV_UINT8, 1, inlink->w, inlink->h,
+                  inlink->w, in->linesize[0], srcnn->layers[1].size_filter, srcnn->layers[1].weights[cf],
+                  srcnn->layers[1].biases[cf]);
+    for (l=2; l<=NUM_LAYERS; ++l)
+        for (cf=0; cf<srcnn->layers[l].num_filters; ++cf)
+            convolute(srcnn->layers[l].out[cf], (const void **)srcnn->layers[l-1].out, CONV_FLOAT, srcnn->layers[l].in_num_filters,
+                      inlink->w, inlink->h, inlink->w, inlink->w, srcnn->layers[l].size_filter, srcnn->layers[l].weights[cf],
+                      srcnn->layers[l].biases[cf]);
+
+    av_image_copy(out->data, out->linesize, (const uint8_t **)in->data, in->linesize, inlink->format, inlink->w, inlink->h);
+    for (i=0; i<inlink->h; ++i) {
+        for (j=0; j<inlink->w; ++j) {
+            THRESHOLD(srcnn->layers[NUM_LAYERS].out[0][i*inlink->w+j], 0, 255);
+            out->data[0][i*out->linesize[0]+j] = (uint8_t)srcnn->layers[NUM_LAYERS].out[0][i*inlink->w+j];
+        }
+    }
+
+    av_frame_free(&in);
+    return ff_filter_frame(outlink, out);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    SRCNNContext *srcnn = ctx->priv;
+    int l, i, j;
+
+    for (l=1; l<=NUM_LAYERS; ++l) {
+        av_freep(&srcnn->layers[l].biases);
+        av_freep(srcnn->layers[l].out);
+        for (i=0; i<srcnn->layers[l].num_filters; ++i) {
+            for (j=0; j<srcnn->layers[l].in_num_filters; ++j)
+                av_freep(srcnn->layers[l].weights[i][j]);
+            av_freep(srcnn->layers[l].weights[i]);
+        }
+        av_freep(srcnn->layers[l].weights);
+    }
+}
+
+static const AVFilterPad srcnn_inputs[] = {
+    {   .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = config_props,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad srcnn_outputs[] = {
+    {   .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_srcnn = {
+    .name          = "srcnn",
+    .description   = NULL_IF_CONFIG_SMALL("Super resolution."),
+    .priv_size     = sizeof(SRCNNContext),
+    .init          = init,
+    .uninit        = uninit,
+    .query_formats = query_formats,
+    .inputs        = srcnn_inputs,
+    .outputs       = srcnn_outputs,
+    .priv_class    = &srcnn_class,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
\ No newline at end of file
-- 
2.7.4

