Why is this not generic filter like already existing opencv filter?
On 10/26/19, ckenn...@ellation.com <ckenn...@ellation.com> wrote:
> From: Christopher Kennedy <ckenn...@ellation.com>
>
> this adds a phqm filter and OpenCV img_hash based resource usable
> by the phqm and future filters using image hash functionality
> from OpenCV.
>
> C++ to C handling so that full OpenCV functionality and API can
> be used instead of the C versions (which are incomplete and
> don't always exist).
>
> Example command line:
>
> ffmpeg -i encode.mp4 -i reference.mp4 \
> -filter_complex "[0:v][1:v]phqm=stats_file=out.log" \
> -y -f null /dev/null
>
> Signed-off-by: Christopher Kennedy <ckenn...@ellation.com>
> ---
> Changelog | 1 +
> configure | 2 +
> libavfilter/Makefile | 2 +
> libavfilter/allfilters.c | 1 +
> libavfilter/img_hash.cpp | 98 ++++++++++++
> libavfilter/img_hash.h | 46 ++++++
> libavfilter/vf_phqm.c | 334 +++++++++++++++++++++++++++++++++++++++
> 7 files changed, 484 insertions(+)
> create mode 100644 libavfilter/img_hash.cpp
> create mode 100644 libavfilter/img_hash.h
> create mode 100644 libavfilter/vf_phqm.c
>
> diff --git a/Changelog b/Changelog
> index 316589e336..4a22f77d37 100644
> --- a/Changelog
> +++ b/Changelog
> @@ -17,6 +17,7 @@ version <next>:
> - anlms filter
> - arnndn filter
> - bilateral filter
> +- phqm perceptual hash filter using OpenCV img_lib
>
>
> version 4.2:
> diff --git a/configure b/configure
> index 8413826f9e..e231d359bb 100755
> --- a/configure
> +++ b/configure
> @@ -3497,6 +3497,8 @@ nlmeans_opencl_filter_deps="opencl"
> nnedi_filter_deps="gpl"
> ocr_filter_deps="libtesseract"
> ocv_filter_deps="libopencv"
> +phqm_filter_deps="libopencv"
> +phqm_filter_extralibs="-lstdc++ -lopencv_img_hash"
> openclsrc_filter_deps="opencl"
> overlay_opencl_filter_deps="opencl"
> overlay_qsv_filter_deps="libmfx"
> diff --git a/libavfilter/Makefile b/libavfilter/Makefile
> index 63d2fba861..645e232b3e 100644
> --- a/libavfilter/Makefile
> +++ b/libavfilter/Makefile
> @@ -325,6 +325,7 @@ OBJS-$(CONFIG_PERMS_FILTER) +=
> f_perms.o
> OBJS-$(CONFIG_PERSPECTIVE_FILTER) += vf_perspective.o
> OBJS-$(CONFIG_PHASE_FILTER) += vf_phase.o
> OBJS-$(CONFIG_PHOTOSENSITIVITY_FILTER) += vf_photosensitivity.o
> +OBJS-$(CONFIG_PHQM_FILTER) += vf_phqm.o img_hash.o
> OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
> OBJS-$(CONFIG_PIXSCOPE_FILTER) += vf_datascope.o
> OBJS-$(CONFIG_PP_FILTER) += vf_pp.o
> @@ -498,6 +499,7 @@ OBJS-$(CONFIG_SHARED) +=
> log2_tab.o
> SKIPHEADERS-$(CONFIG_QSVVPP) += qsvvpp.h
> SKIPHEADERS-$(CONFIG_OPENCL) += opencl.h
> SKIPHEADERS-$(CONFIG_VAAPI) += vaapi_vpp.h
> +SKIPHEADERS-$(CONFIG_LIBOPENCV) += img_hash.h
>
> TOOLS = graph2dot
> TESTPROGS = drawutils filtfmts formats integral
> diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
> index e4186f93db..f0fcaad235 100644
> --- a/libavfilter/allfilters.c
> +++ b/libavfilter/allfilters.c
> @@ -309,6 +309,7 @@ extern AVFilter ff_vf_perms;
> extern AVFilter ff_vf_perspective;
> extern AVFilter ff_vf_phase;
> extern AVFilter ff_vf_photosensitivity;
> +extern AVFilter ff_vf_phqm;
> extern AVFilter ff_vf_pixdesctest;
> extern AVFilter ff_vf_pixscope;
> extern AVFilter ff_vf_pp;
> diff --git a/libavfilter/img_hash.cpp b/libavfilter/img_hash.cpp
> new file mode 100644
> index 0000000000..4d5843da22
> --- /dev/null
> +++ b/libavfilter/img_hash.cpp
> @@ -0,0 +1,98 @@
> +/*
> + * Copyright (c) 2019 Christopher Kennedy
> + *
> + * OpenCV img_hash
> + *
> + * 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
> + */
> +
> +#include <opencv2/core.hpp>
> +#include <opencv2/core/ocl.hpp>
> +#include <opencv2/highgui.hpp>
> +#include <opencv2/img_hash.hpp>
> +#include <opencv2/imgproc.hpp>
> +
> +#include <iostream>
> +
> +#include "img_hash.h"
> +#include "libavutil/pixdesc.h"
> +extern "C" {
> +#include "avfilter.h"
> +}
> +
> +// convert from avframe to iplimage format
> +static int fill_iplimage_from_frame(IplImage *img, const AVFrame *frame,
> enum AVPixelFormat pixfmt)
> +{
> + IplImage *tmpimg;
> + int depth = IPL_DEPTH_8U, channels_nb;
> +
> + switch (pixfmt) {
> + case AV_PIX_FMT_GRAY8: channels_nb = 1; break;
> + case AV_PIX_FMT_BGRA: channels_nb = 4; break;
> + case AV_PIX_FMT_BGR24: channels_nb = 3; break;
> + default: return -1;
> + }
> +
> + tmpimg = cvCreateImageHeader((CvSize){frame->width, frame->height},
> depth, channels_nb);
> + *img = *tmpimg;
> + img->imageData = img->imageDataOrigin = (char *) frame->data[0];
> + img->dataOrder = IPL_DATA_ORDER_PIXEL;
> + img->origin = IPL_ORIGIN_TL;
> + img->widthStep = frame->linesize[0];
> +
> + return 0;
> +}
> +
> +// Get the score of two Video Frames by comparing the perceptual hashes and
> deriving a hamming distance
> +// showing how similar they are or different. lower score is better for
> most algorithms
> +extern "C" double getScore(const AVFrame *frame1, const AVFrame *frame2,
> enum AVPixelFormat pixfmt, int hash_type) {
> + cv::Ptr<cv::img_hash::ImgHashBase> algo;
> + IplImage ipl1, ipl2;
> + cv::Mat h1;
> + cv::Mat h2;
> + cv::Mat m1;
> + cv::Mat m2;
> +
> + // Take FFmpeg video frame and convert into an IplImage for OpenCV
> + if (fill_iplimage_from_frame(&ipl1, frame1, pixfmt) != 0 ||
> + fill_iplimage_from_frame(&ipl2, frame2, pixfmt) != 0)
> + return DBL_MAX; // Return an invalid value if either fails
> +
> + // Convert an IplImage to an Mat Image for OpenCV (newer format)
> + m1 = cv::cvarrToMat(&ipl1);
> + m2 = cv::cvarrToMat(&ipl2);
> +
> + // substantiate the hash type algorithm
> + switch (hash_type) {
> + case PHASH: algo = cv::img_hash::PHash::create();
> break;
> + case AVERAGE: algo = cv::img_hash::AverageHash::create();
> break;
> + case MARRHILDRETH: algo =
> cv::img_hash::MarrHildrethHash::create(); break;
> + case RADIALVARIANCE: algo =
> cv::img_hash::RadialVarianceHash::create(); break;
> + // BlockMeanHash support mode 0 and mode 1, they associate to
> + // mode 1 and mode 2 of PHash library
> + case BLOCKMEAN1: algo =
> cv::img_hash::BlockMeanHash::create(0); break;
> + case BLOCKMEAN2: algo =
> cv::img_hash::BlockMeanHash::create(1); break;
> + case COLORMOMENT: algo =
> cv::img_hash::ColorMomentHash::create(); break;
> + }
> +
> + // Compute the hash
> + algo->compute(m1, h1);
> + algo->compute(m2, h2);
> +
> + // Compare the hashes and return the hamming distance
> + return algo->compare(h1, h2);
> +}
> diff --git a/libavfilter/img_hash.h b/libavfilter/img_hash.h
> new file mode 100644
> index 0000000000..76f55c3013
> --- /dev/null
> +++ b/libavfilter/img_hash.h
> @@ -0,0 +1,46 @@
> +/*
> + * Copyright (c) 2019 Christopher Kennedy
> + *
> + * PHQM Perceptual Hash Quality Metric
> + *
> + * 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_IMG_HASH_H
> +#define AVFILTER_IMG_HASH_H
> +
> +#include "avfilter.h"
> +
> +#if defined(__cplusplus)
> +extern "C"
> +{
> +#endif
> +
> +#define AVERAGE 0
> +#define BLOCKMEAN1 1
> +#define BLOCKMEAN2 2
> +#define COLORMOMENT 3
> +#define MARRHILDRETH 4
> +#define PHASH 5
> +#define RADIALVARIANCE 6
> +
> +double getScore(const AVFrame *frame1, const AVFrame *frame2, enum
> AVPixelFormat pixfmt, int hash_type);
> +#if defined(__cplusplus)
> +}
> +#endif
> +
> +#endif
> diff --git a/libavfilter/vf_phqm.c b/libavfilter/vf_phqm.c
> new file mode 100644
> index 0000000000..0930386b10
> --- /dev/null
> +++ b/libavfilter/vf_phqm.c
> @@ -0,0 +1,334 @@
> +/*
> + * Copyright (c) 2019 Christopher Kennedy
> + *
> + * PHQM Perceptual Hash Quality Metric
> + *
> + * 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
> + * PHQM: Calculate the Image Hash Hamming Difference between two input
> videos.
> + */
> +
> +#include <float.h>
> +#include "libavutil/avstring.h"
> +#include "libavutil/opt.h"
> +#include "libavutil/pixdesc.h"
> +#include "avfilter.h"
> +#include "drawutils.h"
> +#include "formats.h"
> +#include "framesync.h"
> +#include "internal.h"
> +#include "video.h"
> +
> +#include "img_hash.h"
> +#include "scene_sad.h"
> +
> +typedef struct PHQMContext {
> + const AVClass *class;
> + FFFrameSync fs;
> + double shd, hd, min_hd, max_hd, smin_hd, smax_hd;
> + uint64_t nb_shd;
> + uint64_t nb_frames;
> + FILE *stats_file;
> + char *stats_file_str;
> + int hash_type;
> + ff_scene_sad_fn sad; ///< Sum of the absolute difference
> function (scene detect only)
> + double prev_mafd; ///< previous MAFD
> (scene detect only)
> + AVFrame *prev_picref; ///< previous frame
> (scene detect only)
> + double scd_thresh;
> + double scene_score;
> +} PHQMContext;
> +
> +#define OFFSET(x) offsetof(PHQMContext, x)
> +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
> +
> +static const AVOption phqm_options[] = {
> + { "stats_file", "Set file where to store per-frame difference
> information.", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0,
> 0, FLAGS },
> + { "f", "Set file where to store per-frame difference
> information.", OFFSET(stats_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0,
> 0, FLAGS },
> + { "scd_thresh", "Scene Change Detection Threshold.",
> OFFSET(scd_thresh), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 1, FLAGS },
> + { "hash_type", "Type of Image Hash to use from OpenCV.",
> OFFSET(hash_type), AV_OPT_TYPE_INT, {.i64 = PHASH}, 0, 6,
> FLAGS, "hash_type" },
> + { "average", "Average Hash", 0,
> AV_OPT_TYPE_CONST, {.i64 = AVERAGE}, 0, 0, FLAGS, "hash_type" },
> + { "blockmean1", "Block Mean Hash 1", 0,
> AV_OPT_TYPE_CONST, {.i64 = BLOCKMEAN1}, 0, 0, FLAGS, "hash_type" },
> + { "blockmean2", "Block Mean Hash 2", 0,
> AV_OPT_TYPE_CONST, {.i64 = BLOCKMEAN2}, 0, 0, FLAGS, "hash_type" },
> + { "colormoment", "Color Moment Hash", 0,
> AV_OPT_TYPE_CONST, {.i64 = COLORMOMENT}, 0, 0, FLAGS, "hash_type" },
> + { "marrhildreth", "Marr Hildreth Hash", 0,
> AV_OPT_TYPE_CONST, {.i64 = MARRHILDRETH}, 0, 0, FLAGS, "hash_type" },
> + { "phash", "Perceptual Hash (PHash)", 0,
> AV_OPT_TYPE_CONST, {.i64 = PHASH}, 0, 0, FLAGS, "hash_type" },
> + { "radialvariance", "Radial Variance Hash", 0,
> AV_OPT_TYPE_CONST, {.i64 = RADIALVARIANCE}, 0, 0, FLAGS, "hash_type" },
> + { NULL }
> +};
> +
> +FRAMESYNC_DEFINE_CLASS(phqm, PHQMContext, fs);
> +
> +static void set_meta(AVDictionary **metadata, const char *key, char comp,
> float d)
> +{
> + char value[128];
> + snprintf(value, sizeof(value), "%0.2f", d);
> + if (comp) {
> + char key2[128];
> + snprintf(key2, sizeof(key2), "%s%c", key, comp);
> + av_dict_set(metadata, key2, value, 0);
> + } else {
> + av_dict_set(metadata, key, value, 0);
> + }
> +}
> +
> +static double get_scene_score(AVFilterContext *ctx, AVFrame *frame)
> +{
> + double ret = 0.;
> + PHQMContext *s = ctx->priv;
> + AVFrame *prev_picref = s->prev_picref;
> +
> + if (prev_picref &&
> + frame->height == prev_picref->height &&
> + frame->width == prev_picref->width) {
> + uint64_t sad;
> + double mafd, diff;
> +
> + s->sad(prev_picref->data[0], prev_picref->linesize[0],
> frame->data[0], frame->linesize[0], frame->width * 3, frame->height, &sad);
> + emms_c();
> + mafd = (double)sad / (frame->width * 3 * frame->height);
> + diff = fabs(mafd - s->prev_mafd);
> + ret = av_clipf(FFMIN(mafd, diff) / 100., 0, 1);
> + s->prev_mafd = mafd;
> + av_frame_free(&prev_picref);
> + }
> + s->prev_picref = av_frame_clone(frame);
> + return ret;
> +}
> +
> +static int do_phqm(FFFrameSync *fs)
> +{
> + AVFilterContext *ctx = fs->parent;
> + PHQMContext *s = ctx->priv;
> + AVFrame *master, *ref;
> + double hd = 0.;
> + int ret;
> + double hd_limit = 1000000.;
> + AVDictionary **metadata;
> +
> + ret = ff_framesync_dualinput_get(fs, &master, &ref);
> + if (ret < 0)
> + return ret;
> + if (!ref)
> + return ff_filter_frame(ctx->outputs[0], master);
> + metadata = &master->metadata;
> +
> +
> + s->nb_frames++;
> +
> + /* scene change detection score */
> + s->scene_score = get_scene_score(ctx, ref);
> + if (s->scene_score >= s->scd_thresh && s->nb_shd >= 48) {
> + av_log(s, AV_LOG_INFO, "ImgHashScene: n:%"PRId64"-%"PRId64"
> hd_avg:%0.3lf hd_min:%0.3lf hd_max:%0.3lf scd:%0.2lf\n",
> + (s->nb_frames - s->nb_shd), s->nb_frames - 1, (s->shd /
> s->nb_shd), s->smin_hd, s->smax_hd, s->scene_score);
> + s->shd = 0.;
> + s->nb_shd = 0;
> + s->smin_hd = 0.;
> + s->smax_hd = 0.;
> + }
> +
> + /* limit the highest value so we cut off at perceptual difference match
> */
> + switch (s->hash_type) {
> + case PHASH:
> + case AVERAGE: hd_limit = 5; break;
> + case MARRHILDRETH: hd_limit = 30; break;
> + case RADIALVARIANCE: hd_limit = 0.9; break;
> + case BLOCKMEAN1: hd_limit = 12; break;
> + case BLOCKMEAN2: hd_limit = 48; break;
> + case COLORMOMENT: hd_limit = 8; break;
> + }
> +
> + /* get ref / enc perceptual hashes and calc hamming distance difference
> value */
> + hd = getScore(ref, master, ref->format, s->hash_type);
> + if (hd == DBL_MAX) {
> + av_log(s, AV_LOG_ERROR, "Failure with handling pix_fmt of AVFrame
> for conversion to IPLimage.\n");
> + return AVERROR(EINVAL);
> + }
> + s->hd += FFMIN(hd, hd_limit);
> + set_meta(metadata, "lavfi.phqm.phqm", 0, hd);
> +
> + /* scene hamming distance avg */
> + s->shd += FFMIN(hd, hd_limit);
> + s->nb_shd++;
> + av_log(s, AV_LOG_DEBUG, "ImgHashFrame: hd:%0.3lf scd:%0.2lf\n", hd,
> s->scene_score);
> +
> + s->min_hd = FFMIN(s->min_hd, hd);
> + s->max_hd = FFMAX(s->max_hd, hd);
> + s->smin_hd = FFMIN(s->smin_hd, hd);
> + s->smax_hd = FFMAX(s->smax_hd, hd);
> +
> + if (s->stats_file) {
> + fprintf(s->stats_file,
> + "n:%"PRId64" phqm:%0.3f phqm_min:%0.3f phqm_max:%0.3f
> sad:%0.2f",
> + s->nb_frames, hd, s->min_hd, s->max_hd, s->scene_score);
> + fprintf(s->stats_file, "\n");
> + }
> +
> + return ff_filter_frame(ctx->outputs[0], master);
> +}
> +
> +static av_cold int init(AVFilterContext *ctx)
> +{
> + PHQMContext *s = ctx->priv;
> +
> + if (s->stats_file_str) {
> + if (!strcmp(s->stats_file_str, "-")) {
> + s->stats_file = stdout;
> + } else {
> + s->stats_file = fopen(s->stats_file_str, "w");
> + if (!s->stats_file) {
> + int err = AVERROR(errno);
> + char buf[128];
> + av_strerror(err, buf, sizeof(buf));
> + av_log(ctx, AV_LOG_ERROR, "Could not open stats file %s:
> %s\n",
> + s->stats_file_str, buf);
> + return err;
> + }
> + }
> + }
> +
> + s->sad = ff_scene_sad_get_fn(8);
> + if (!s->sad)
> + return AVERROR(EINVAL);
> +
> + s->fs.on_event = do_phqm;
> + return 0;
> +}
> +
> +static int query_formats(AVFilterContext *ctx)
> +{
> + PHQMContext *s = ctx->priv;
> + AVFilterFormats *fmts_list = NULL;
> + static const enum AVPixelFormat gray8_pix_fmts[] = {
> + AV_PIX_FMT_GRAY8,
> + AV_PIX_FMT_NONE
> + };
> + static const enum AVPixelFormat bgr24_pix_fmts[] = {
> + AV_PIX_FMT_BGR24,
> + AV_PIX_FMT_NONE
> + };
> + static const enum AVPixelFormat bgra_pix_fmts[] = {
> + AV_PIX_FMT_BGRA,
> + AV_PIX_FMT_NONE
> + };
> +
> + switch (s->hash_type) {
> + case COLORMOMENT: fmts_list = ff_make_format_list(bgr24_pix_fmts);
> break;
> + case MARRHILDRETH: fmts_list = ff_make_format_list(bgra_pix_fmts);
> break;
> + /* all other hashes take the gray8 format */
> + default: fmts_list = ff_make_format_list(gray8_pix_fmts); break;
> + }
> + 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;
> +
> + 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);
> + }
> +
> + return 0;
> +}
> +
> +static int config_output(AVFilterLink *outlink)
> +{
> + AVFilterContext *ctx = outlink->src;
> + PHQMContext *s = ctx->priv;
> + AVFilterLink *mainlink = ctx->inputs[0];
> + int ret;
> +
> + ret = ff_framesync_init_dualinput(&s->fs, ctx);
> + if (ret < 0)
> + return 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_configure(&s->fs)) < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static int activate(AVFilterContext *ctx)
> +{
> + PHQMContext *s = ctx->priv;
> + return ff_framesync_activate(&s->fs);
> +}
> +
> +static av_cold void uninit(AVFilterContext *ctx)
> +{
> + PHQMContext *s = ctx->priv;
> +
> + if (s->nb_frames > 0)
> + av_log(ctx, AV_LOG_WARNING, "PHQM average:%f min:%f max:%f\n",
> + s->hd / s->nb_frames, s->min_hd, s->max_hd);
> +
> + ff_framesync_uninit(&s->fs);
> +
> + if (s->stats_file && s->stats_file != stdout)
> + fclose(s->stats_file);
> + av_frame_free(&s->prev_picref);
> +}
> +
> +static const AVFilterPad phqm_inputs[] = {
> + {
> + .name = "main",
> + .type = AVMEDIA_TYPE_VIDEO,
> + },{
> + .name = "reference",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = config_input_ref,
> + },
> + { NULL }
> +};
> +
> +static const AVFilterPad phqm_outputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .config_props = config_output,
> + },
> + { NULL }
> +};
> +
> +AVFilter ff_vf_phqm= {
> + .name = "phqm",
> + .description = NULL_IF_CONFIG_SMALL("PHQM: Calculate the Perceptual
> Hash Hamming Difference between two video streams."),
> + .preinit = phqm_framesync_preinit,
> + .init = init,
> + .uninit = uninit,
> + .query_formats = query_formats,
> + .activate = activate,
> + .priv_size = sizeof(PHQMContext),
> + .priv_class = &phqm_class,
> + .inputs = phqm_inputs,
> + .outputs = phqm_outputs,
> +};
> --
> 2.20.1
>
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