[FFmpeg-devel] [PATCH] avfilter: add vif filter
Paul B Mahol
onemda at gmail.com
Fri Feb 12 19:41:48 EET 2021
From: Ashish Singh <ashk43712 at gmail.com>
This is Visual Information Fidelity (VIF) filter and one of the component
filters of VMAF. It outputs the average VIF score over all frames.
Signed-off-by: Ashish Singh <ashk43712 at gmail.com>
Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
doc/filters.texi | 21 ++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_vif.c | 654 +++++++++++++++++++++++++++++++++++++++
libavfilter/vif.h | 30 ++
5 files changed, 707 insertions(+)
create mode 100644 libavfilter/vf_vif.c
create mode 100644 libavfilter/vif.h
diff --git a/doc/filters.texi b/doc/filters.texi
index b3b34bb2e8..4d5f9b5b51 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -21262,6 +21262,27 @@ otherwise colors will be less saturated, more towards gray.
This filter supports the all above options as @ref{commands}.
+ at section vif
+
+Obtain the average VIF (Visual Information Fidelity) between two input videos.
+
+This filter takes two input videos.
+
+Both input videos must have the same resolution and pixel format for
+this filter to work correctly. Also it assumes that both inputs
+have the same number of frames, which are compared one by one.
+
+The obtained average VIF score is printed through the logging system.
+
+The filter stores the calculated VIF score of each frame.
+
+In the below example the input file @file{main.mpg} being processed is compared
+with the reference file @file{ref.mpg}.
+
+ at example
+ffmpeg -i main.mpg -i ref.mpg -lavfi vif -f null -
+ at end example
+
@anchor{vignette}
@section vignette
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 3333ad16ef..9a1e3ef489 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -470,6 +470,7 @@ OBJS-$(CONFIG_VFRDET_FILTER) += vf_vfrdet.o
OBJS-$(CONFIG_VIBRANCE_FILTER) += vf_vibrance.o
OBJS-$(CONFIG_VIDSTABDETECT_FILTER) += vidstabutils.o vf_vidstabdetect.o
OBJS-$(CONFIG_VIDSTABTRANSFORM_FILTER) += vidstabutils.o vf_vidstabtransform.o
+OBJS-$(CONFIG_VIF_FILTER) += vf_vif.o framesync.o
OBJS-$(CONFIG_VIGNETTE_FILTER) += vf_vignette.o
OBJS-$(CONFIG_VMAFMOTION_FILTER) += vf_vmafmotion.o framesync.o
OBJS-$(CONFIG_VPP_QSV_FILTER) += vf_vpp_qsv.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 7fa01ff139..d2d543f917 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -448,6 +448,7 @@ extern AVFilter ff_vf_vfrdet;
extern AVFilter ff_vf_vibrance;
extern AVFilter ff_vf_vidstabdetect;
extern AVFilter ff_vf_vidstabtransform;
+extern AVFilter ff_vf_vif;
extern AVFilter ff_vf_vignette;
extern AVFilter ff_vf_vmafmotion;
extern AVFilter ff_vf_vpp_qsv;
diff --git a/libavfilter/vf_vif.c b/libavfilter/vf_vif.c
new file mode 100644
index 0000000000..c1ef311500
--- /dev/null
+++ b/libavfilter/vf_vif.c
@@ -0,0 +1,654 @@
+/*
+ * Copyright (c) 2017 Ronald S. Bultje <rsbultje at gmail.com>
+ * Copyright (c) 2017 Ashish Pratap Singh <ashk43712 at gmail.com>
+ * Copyright (c) 2021 Paul B Mahol
+ *
+ * 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
+ * Calculate VIF between two input videos.
+ */
+
+#include <float.h>
+
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "framesync.h"
+#include "drawutils.h"
+#include "formats.h"
+#include "internal.h"
+#include "vif.h"
+#include "video.h"
+
+typedef struct VIFContext {
+ const AVClass *class;
+ FFFrameSync fs;
+ const AVPixFmtDescriptor *desc;
+ int width;
+ int height;
+ int nb_threads;
+ float *data_buf[13];
+ float **temp;
+ float *ref_data;
+ float *main_data;
+ double vif_sum[4];
+ double vif_min[4];
+ double vif_max[4];
+ uint64_t nb_frames;
+} VIFContext;
+
+#define OFFSET(x) offsetof(VIFContext, x)
+
+static const AVOption vif_options[] = {
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(vif);
+
+static const uint8_t vif_filter1d_width1[4] = { 17, 9, 5, 3 };
+
+static const float vif_filter1d_table[4][17] =
+{
+ {
+ 0.00745626912, 0.0142655009, 0.0250313189, 0.0402820669, 0.0594526194,
+ 0.0804751068, 0.0999041125, 0.113746084, 0.118773937, 0.113746084,
+ 0.0999041125, 0.0804751068, 0.0594526194, 0.0402820669, 0.0250313189,
+ 0.0142655009, 0.00745626912
+ },
+ {
+ 0.0189780835, 0.0558981746, 0.120920904, 0.192116052, 0.224173605,
+ 0.192116052, 0.120920904, 0.0558981746, 0.0189780835
+ },
+ {
+ 0.054488685, 0.244201347, 0.402619958, 0.244201347, 0.054488685
+ },
+ {
+ 0.166378498, 0.667243004, 0.166378498
+ }
+};
+
+typedef struct ThreadData {
+ const float *filter;
+ const float *src;
+ float *dst;
+ int w, h;
+ int src_stride;
+ int dst_stride;
+ int filter_width;
+ float **temp;
+} ThreadData;
+
+static void vif_dec2(const float *src, float *dst, int w, int h,
+ int src_stride, int dst_stride)
+{
+ const int dst_px_stride = dst_stride / 2;
+
+ for (int i = 0; i < h / 2; i++) {
+ for (int j = 0; j < w / 2; j++)
+ dst[i * dst_px_stride + j] = src[(i * 2) * src_stride + (j * 2)];
+ }
+}
+
+static void vif_statistic(const float *mu1_sq, const float *mu2_sq,
+ const float *mu1_mu2, const float *xx_filt,
+ const float *yy_filt, const float *xy_filt,
+ float *num, float *den, int w, int h)
+{
+ static const float sigma_nsq = 2;
+ static const float sigma_max_inv = 4.0/(255.0*255.0);
+
+ float mu1_sq_val, mu2_sq_val, mu1_mu2_val, xx_filt_val, yy_filt_val, xy_filt_val;
+ float sigma1_sq, sigma2_sq, sigma12, g, sv_sq, eps = 1.0e-10f;
+ float gain_limit = 100.f;
+ float num_val, den_val;
+ float accum_num = 0.0f;
+ float accum_den = 0.0f;
+
+ for (int i = 0; i < h; i++) {
+ float accum_inner_num = 0.f;
+ float accum_inner_den = 0.f;
+
+ for (int j = 0; j < w; j++) {
+ mu1_sq_val = mu1_sq[i * w + j];
+ mu2_sq_val = mu2_sq[i * w + j];
+ mu1_mu2_val = mu1_mu2[i * w + j];
+ xx_filt_val = xx_filt[i * w + j];
+ yy_filt_val = yy_filt[i * w + j];
+ xy_filt_val = xy_filt[i * w + j];
+
+ sigma1_sq = xx_filt_val - mu1_sq_val;
+ sigma2_sq = yy_filt_val - mu2_sq_val;
+ sigma12 = xy_filt_val - mu1_mu2_val;
+
+ sigma1_sq = FFMAX(sigma1_sq, 0.0f);
+ sigma2_sq = FFMAX(sigma2_sq, 0.0f);
+ sigma12 = FFMAX(sigma12, 0.0f);
+
+ g = sigma12 / (sigma1_sq + eps);
+ sv_sq = sigma2_sq - g * sigma12;
+
+ if (sigma1_sq < eps) {
+ g = 0.0f;
+ sv_sq = sigma2_sq;
+ sigma1_sq = 0.0f;
+ }
+
+ if (sigma2_sq < eps) {
+ g = 0.0f;
+ sv_sq = 0.0f;
+ }
+
+ if (g < 0.0f) {
+ sv_sq = sigma2_sq;
+ g = 0.0f;
+ }
+ sv_sq = FFMAX(sv_sq, eps);
+
+ g = FFMIN(g, gain_limit);
+
+ num_val = log2f(1.0f + g * g * sigma1_sq / (sv_sq + sigma_nsq));
+ den_val = log2f(1.0f + sigma1_sq / sigma_nsq);
+
+ if (sigma12 < 0.0f)
+ num_val = 0.0f;
+
+ if (sigma1_sq < sigma_nsq) {
+ num_val = 1.0f - sigma2_sq * sigma_max_inv;
+ den_val = 1.0f;
+ }
+
+ accum_inner_num += num_val;
+ accum_inner_den += den_val;
+ }
+
+ accum_num += accum_inner_num;
+ accum_den += accum_inner_den;
+ }
+
+ num[0] = accum_num;
+ den[0] = accum_den;
+}
+
+static void vif_xx_yy_xy(const float *x, const float *y, float *xx, float *yy,
+ float *xy, int w, int h)
+{
+ for (int i = 0; i < h; i++) {
+ for (int j = 0; j < w; j++) {
+ float xval = x[j];
+ float yval = y[j];
+ float xxval = xval * xval;
+ float yyval = yval * yval;
+ float xyval = xval * yval;
+
+ xx[j] = xxval;
+ yy[j] = yyval;
+ xy[j] = xyval;
+ }
+
+ xx += w;
+ yy += w;
+ xy += w;
+ x += w;
+ y += w;
+ }
+}
+
+static int vif_filter1d(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+ ThreadData *td = arg;
+ const float *filter = td->filter;
+ const float *src = td->src;
+ float *dst = td->dst;
+ int w = td->w;
+ int h = td->h;
+ int src_stride = td->src_stride;
+ int dst_stride = td->dst_stride;
+ int filt_w = td->filter_width;
+ float *temp = td->temp[jobnr];
+ const int slice_start = (h * jobnr) / nb_jobs;
+ const int slice_end = (h * (jobnr+1)) / nb_jobs;
+
+ for (int i = slice_start; i < slice_end; i++) {
+ /** Vertical pass. */
+ for (int j = 0; j < w; j++) {
+ float sum = 0.f;
+
+ if (i >= filt_w / 2 && i < h - filt_w) {
+ for (int filt_i = 0; filt_i < filt_w; filt_i++) {
+ const float filt_coeff = filter[filt_i];
+ float img_coeff;
+ int ii = i - filt_w / 2 + filt_i;
+
+ img_coeff = src[ii * src_stride + j];
+ sum += filt_coeff * img_coeff;
+ }
+ } else {
+ for (int filt_i = 0; filt_i < filt_w; filt_i++) {
+ const float filt_coeff = filter[filt_i];
+ int ii = i - filt_w / 2 + filt_i;
+ float img_coeff;
+
+ ii = ii < 0 ? -ii : (ii >= h ? 2 * h - ii - 1 : ii);
+
+ img_coeff = src[ii * src_stride + j];
+ sum += filt_coeff * img_coeff;
+ }
+ }
+
+ temp[j] = sum;
+ }
+
+ /** Horizontal pass. */
+ for (int j = 0; j < w; j++) {
+ float sum = 0.f;
+
+ if (j >= filt_w / 2 && j < w - filt_w) {
+ for (int filt_j = 0; filt_j < filt_w; filt_j++) {
+ const float filt_coeff = filter[filt_j];
+ int jj = j - filt_w / 2 + filt_j;
+ float img_coeff;
+
+ img_coeff = temp[jj];
+ sum += filt_coeff * img_coeff;
+ }
+ } else {
+ for (int filt_j = 0; filt_j < filt_w; filt_j++) {
+ const float filt_coeff = filter[filt_j];
+ int jj = j - filt_w / 2 + filt_j;
+ float img_coeff;
+
+ jj = jj < 0 ? -jj : (jj >= w ? 2 * w - jj - 1 : jj);
+
+ img_coeff = temp[jj];
+ sum += filt_coeff * img_coeff;
+ }
+ }
+
+ dst[i * dst_stride + j] = sum;
+ }
+ }
+
+ return 0;
+}
+
+int ff_compute_vif2(AVFilterContext *ctx,
+ const float *ref, const float *main, int w, int h,
+ int ref_stride, int main_stride, float *score,
+ float *data_buf[14], float **temp,
+ int gnb_threads)
+{
+ ThreadData td;
+ float *ref_scale = data_buf[0];
+ float *main_scale = data_buf[1];
+ float *ref_sq = data_buf[2];
+ float *main_sq = data_buf[3];
+ float *ref_main = data_buf[4];
+ float *mu1 = data_buf[5];
+ float *mu2 = data_buf[6];
+ float *mu1_sq = data_buf[7];
+ float *mu2_sq = data_buf[8];
+ float *mu1_mu2 = data_buf[9];
+ float *ref_sq_filt = data_buf[10];
+ float *main_sq_filt = data_buf[11];
+ float *ref_main_filt = data_buf[12];
+
+ float *curr_ref_scale = (float *)ref;
+ float *curr_main_scale = (float *)main;
+ int curr_ref_stride = ref_stride;
+ int curr_main_stride = main_stride;
+
+ float num = 0.f;
+ float den = 0.f;
+
+ for (int scale = 0; scale < 4; scale++) {
+ const float *filter = vif_filter1d_table[scale];
+ int filter_width = vif_filter1d_width1[scale];
+ const int nb_threads = FFMIN(h, gnb_threads);
+ int buf_valid_w = w;
+ int buf_valid_h = h;
+
+ td.filter = filter;
+ td.filter_width = filter_width;
+
+ if (scale > 0) {
+ td.src = curr_ref_scale;
+ td.dst = mu1;
+ td.w = w;
+ td.h = h;
+ td.src_stride = curr_ref_stride;
+ td.dst_stride = w;
+ td.temp = temp;
+ ctx->internal->execute(ctx, vif_filter1d, &td, NULL, nb_threads);
+
+ td.src = curr_main_scale;
+ td.dst = mu2;
+ td.src_stride = curr_main_stride;
+ ctx->internal->execute(ctx, vif_filter1d, &td, NULL, nb_threads);
+
+ vif_dec2(mu1, ref_scale, buf_valid_w, buf_valid_h, w, w);
+ vif_dec2(mu2, main_scale, buf_valid_w, buf_valid_h, w, w);
+
+ w = buf_valid_w / 2;
+ h = buf_valid_h / 2;
+
+ buf_valid_w = w;
+ buf_valid_h = h;
+
+ curr_ref_scale = ref_scale;
+ curr_main_scale = main_scale;
+
+ curr_ref_stride = w;
+ curr_main_stride = w;
+ }
+
+ td.src = curr_ref_scale;
+ td.dst = mu1;
+ td.w = w;
+ td.h = h;
+ td.src_stride = curr_ref_stride;
+ td.dst_stride = w;
+ td.temp = temp;
+ ctx->internal->execute(ctx, vif_filter1d, &td, NULL, nb_threads);
+
+ td.src = curr_main_scale;
+ td.dst = mu2;
+ td.src_stride = curr_main_stride;
+ ctx->internal->execute(ctx, vif_filter1d, &td, NULL, nb_threads);
+
+ vif_xx_yy_xy(mu1, mu2, mu1_sq, mu2_sq, mu1_mu2, w, h);
+
+ vif_xx_yy_xy(curr_ref_scale, curr_main_scale, ref_sq, main_sq, ref_main, w, h);
+
+ td.src = ref_sq;
+ td.dst = ref_sq_filt;
+ td.src_stride = w;
+ ctx->internal->execute(ctx, vif_filter1d, &td, NULL, nb_threads);
+
+ td.src = main_sq;
+ td.dst = main_sq_filt;
+ td.src_stride = w;
+ ctx->internal->execute(ctx, vif_filter1d, &td, NULL, nb_threads);
+
+ td.src = ref_main;
+ td.dst = ref_main_filt;
+ ctx->internal->execute(ctx, vif_filter1d, &td, NULL, nb_threads);
+
+ vif_statistic(mu1_sq, mu2_sq, mu1_mu2, ref_sq_filt, main_sq_filt,
+ ref_main_filt, &num, &den, w, h);
+
+ score[scale] = den <= FLT_EPSILON ? 1.f : num / den;
+ }
+
+ return 0;
+}
+
+#define offset_fn(type, bits) \
+static void offset_##bits##bit(VIFContext *s, \
+ const AVFrame *ref, \
+ AVFrame *main, int stride)\
+{ \
+ int w = s->width; \
+ int h = s->height; \
+ \
+ int ref_stride = ref->linesize[0]; \
+ int main_stride = main->linesize[0]; \
+ \
+ const type *ref_ptr = (const type *) ref->data[0]; \
+ const type *main_ptr = (const type *) main->data[0]; \
+ \
+ float *ref_ptr_data = s->ref_data; \
+ float *main_ptr_data = s->main_data; \
+ \
+ for (int i = 0; i < h; i++) { \
+ for (int j = 0; j < w; j++) { \
+ ref_ptr_data[j] = ref_ptr[j] - 128.f; \
+ main_ptr_data[j] = main_ptr[j] - 128.f; \
+ } \
+ ref_ptr += ref_stride / sizeof(type); \
+ ref_ptr_data += w; \
+ main_ptr += main_stride / sizeof(type); \
+ main_ptr_data += w; \
+ } \
+}
+
+offset_fn(uint8_t, 8);
+offset_fn(uint16_t, 10);
+
+static void set_meta(AVDictionary **metadata, const char *key, float d)
+{
+ char value[257];
+ snprintf(value, sizeof(value), "%f", d);
+ av_dict_set(metadata, key, value, 0);
+}
+
+static AVFrame *do_vif(AVFilterContext *ctx, AVFrame *main, const AVFrame *ref)
+{
+ VIFContext *s = ctx->priv;
+ AVDictionary **metadata = &main->metadata;
+ float score[4];
+
+ if (s->desc->comp[0].depth <= 8) {
+ offset_8bit(s, ref, main, s->width);
+ } else {
+ offset_10bit(s, ref, main, s->width);
+ }
+
+ ff_compute_vif2(ctx,
+ s->ref_data, s->main_data, s->width,
+ s->height, s->width, s->width,
+ score, s->data_buf, s->temp,
+ s->nb_threads);
+
+ set_meta(metadata, "lavfi.vif.scale.0", score[0]);
+ set_meta(metadata, "lavfi.vif.scale.1", score[1]);
+ set_meta(metadata, "lavfi.vif.scale.2", score[2]);
+ set_meta(metadata, "lavfi.vif.scale.3", score[3]);
+
+ for (int i = 0; i < 4; i++) {
+ s->vif_min[i] = FFMIN(s->vif_min[i], score[i]);
+ s->vif_max[i] = FFMAX(s->vif_max[i], score[i]);
+ s->vif_sum[i] += score[i];
+ }
+
+ s->nb_frames++;
+
+ return main;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ static const enum AVPixelFormat pix_fmts[] = {
+ AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P,
+ AV_PIX_FMT_YUV444P10LE, AV_PIX_FMT_YUV422P10LE, AV_PIX_FMT_YUV420P10LE,
+ AV_PIX_FMT_NONE
+ };
+
+ AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts);
+ if (!fmts_list)
+ return AVERROR(ENOMEM);
+ return ff_set_common_formats(ctx, fmts_list);
+}
+
+static int config_input_ref(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ VIFContext *s = ctx->priv;
+
+ if (ctx->inputs[0]->w != ctx->inputs[1]->w ||
+ ctx->inputs[0]->h != ctx->inputs[1]->h) {
+ av_log(ctx, AV_LOG_ERROR, "Width and height of input videos must be same.\n");
+ return AVERROR(EINVAL);
+ }
+ if (ctx->inputs[0]->format != ctx->inputs[1]->format) {
+ av_log(ctx, AV_LOG_ERROR, "Inputs must be of same pixel format.\n");
+ return AVERROR(EINVAL);
+ }
+
+ s->desc = av_pix_fmt_desc_get(inlink->format);
+ s->width = ctx->inputs[0]->w;
+ s->height = ctx->inputs[0]->h;
+ s->nb_threads = ff_filter_get_nb_threads(ctx);
+
+ for (int i = 0; i < 4; i++) {
+ s->vif_min[i] = DBL_MAX;
+ s->vif_max[i] = -DBL_MAX;
+ }
+
+ for (int i = 0; i < 13; i++) {
+ if (!(s->data_buf[i] = av_calloc(s->width, s->height * sizeof(float))))
+ return AVERROR(ENOMEM);
+ }
+
+ if (!(s->ref_data = av_calloc(s->width, s->height * sizeof(float))))
+ return AVERROR(ENOMEM);
+
+ if (!(s->main_data = av_calloc(s->width, s->height * sizeof(float))))
+ return AVERROR(ENOMEM);
+
+ if (!(s->temp = av_calloc(s->nb_threads, sizeof(s->temp[0]))))
+ return AVERROR(ENOMEM);
+
+ for (int i = 0; i < s->nb_threads; i++) {
+ if (!(s->temp[i] = av_calloc(s->width, sizeof(float))))
+ return AVERROR(ENOMEM);
+ }
+
+ return 0;
+}
+
+static int process_frame(FFFrameSync *fs)
+{
+ AVFilterContext *ctx = fs->parent;
+ VIFContext *s = fs->opaque;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVFrame *out, *main = NULL, *ref = NULL;
+ int ret;
+
+ ret = ff_framesync_dualinput_get(fs, &main, &ref);
+ if (ret < 0)
+ return ret;
+
+ if (ctx->is_disabled || !ref) {
+ out = main;
+ } else {
+ out = do_vif(ctx, main, ref);
+ }
+
+ 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;
+ VIFContext *s = ctx->priv;
+ AVFilterLink *mainlink = ctx->inputs[0];
+ FFFrameSyncIn *in;
+ int ret;
+
+ outlink->w = mainlink->w;
+ outlink->h = mainlink->h;
+ outlink->time_base = mainlink->time_base;
+ outlink->sample_aspect_ratio = mainlink->sample_aspect_ratio;
+ outlink->frame_rate = mainlink->frame_rate;
+ if ((ret = ff_framesync_init(&s->fs, ctx, 2)) < 0)
+ return ret;
+
+ in = s->fs.in;
+ in[0].time_base = mainlink->time_base;
+ in[1].time_base = ctx->inputs[1]->time_base;
+ in[0].sync = 2;
+ in[0].before = EXT_STOP;
+ in[0].after = EXT_STOP;
+ in[1].sync = 1;
+ in[1].before = EXT_STOP;
+ in[1].after = EXT_STOP;
+ s->fs.opaque = s;
+ s->fs.on_event = process_frame;
+
+ return ff_framesync_configure(&s->fs);
+}
+
+static int activate(AVFilterContext *ctx)
+{
+ VIFContext *s = ctx->priv;
+ return ff_framesync_activate(&s->fs);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ VIFContext *s = ctx->priv;
+
+ if (s->nb_frames > 0) {
+ for (int i = 0; i < 4; i++)
+ av_log(ctx, AV_LOG_INFO, "VIF scale=%d average:%f min:%f: max:%f\n",
+ i, s->vif_sum[i] / s->nb_frames, s->vif_min[i], s->vif_max[i]);
+ }
+
+ for (int i = 0; i < 13; i++)
+ av_freep(&s->data_buf[i]);
+
+ av_freep(&s->ref_data);
+ av_freep(&s->main_data);
+
+ for (int i = 0; i < s->nb_threads && s->temp; i++)
+ av_freep(&s->temp[i]);
+
+ av_freep(&s->temp);
+
+ ff_framesync_uninit(&s->fs);
+}
+
+static const AVFilterPad vif_inputs[] = {
+ {
+ .name = "main",
+ .type = AVMEDIA_TYPE_VIDEO,
+ },{
+ .name = "reference",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input_ref,
+ },
+ { NULL }
+};
+
+static const AVFilterPad vif_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_vif = {
+ .name = "vif",
+ .description = NULL_IF_CONFIG_SMALL("Calculate the VIF between two video streams."),
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .priv_size = sizeof(VIFContext),
+ .priv_class = &vif_class,
+ .activate = activate,
+ .inputs = vif_inputs,
+ .outputs = vif_outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL | AVFILTER_FLAG_SLICE_THREADS,
+};
diff --git a/libavfilter/vif.h b/libavfilter/vif.h
new file mode 100644
index 0000000000..040c709c6a
--- /dev/null
+++ b/libavfilter/vif.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2017 Ronald S. Bultje <rsbultje at gmail.com>
+ * Copyright (c) 2017 Ashish Pratap Singh <ashk43712 at gmail.com>
+ *
+ * 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
+ */
+
+#ifndef AVFILTER_VIF_H
+#define AVFILTER_VIF_H
+
+int ff_compute_vif2(AVFilterContext *ctx,
+ const float *ref, const float *main, int w, int h,
+ int ref_stride, int main_stride, float *score,
+ float *data_buf[13], float **temp, int nb_threads);
+
+#endif /* AVFILTER_VIF_H */
--
2.17.1
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