@@ -28,6 +28,7 @@ version <next>:

 - WebVTT encoder

 - showcqt multimedia filter

 - zoompan filter

+- signalstats filter

 version 2.2:

@@ -7532,6 +7532,172 @@ Swap the second and third planes of the input:

 ffmpeg -i INPUT -vf shuffleplanes=0:2:1:3 OUTPUT

 @end example

+@section signalstats

+Evaluate various visual metrics that assist in determining issues associated

+with the digitization of analog video media.

+

+By default the filter will log these metadata values:

+

+@table @option

+@item YMIN

+Display the minimal Y value contained within the input frame. Expressed in

+range of [0-255].

+

+@item YLOW

+Display the Y value at the 10% percentile within the input frame. Expressed in

+range of [0-255].

+

+@item YAVG

+Display the average Y value within the input frame. Expressed in range of

+[0-255].

+

+@item YHIGH

+Display the Y value at the 90% percentile within the input frame. Expressed in

+range of [0-255].

+

+@item YMAX

+Display the maximum Y value contained within the input frame. Expressed in

+range of [0-255].

+

+@item UMIN

+Display the minimal U value contained within the input frame. Expressed in

+range of [0-255].

+

+@item ULOW

+Display the U value at the 10% percentile within the input frame. Expressed in

+range of [0-255].

+

+@item UAVG

+Display the average U value within the input frame. Expressed in range of

+[0-255].

+

+@item UHIGH

+Display the U value at the 90% percentile within the input frame. Expressed in

+range of [0-255].

+

+@item UMAX

+Display the maximum U value contained within the input frame. Expressed in

+range of [0-255].

+

+@item VMIN

+Display the minimal V value contained within the input frame. Expressed in

+range of [0-255].

+

+@item VLOW

+Display the V value at the 10% percentile within the input frame. Expressed in

+range of [0-255].

+

+@item VAVG

+Display the average V value within the input frame. Expressed in range of

+[0-255].

+

+@item VHIGH

+Display the V value at the 90% percentile within the input frame. Expressed in

+range of [0-255].

+

+@item VMAX

+Display the maximum V value contained within the input frame. Expressed in

+range of [0-255].

+

+@item SATMIN

+Display the minimal saturation value contained within the input frame.

+Expressed in range of [0-~181.02].

+

+@item SATLOW

+Display the saturation value at the 10% percentile within the input frame.

+Expressed in range of [0-~181.02].

+

+@item SATAVG

+Display the average saturation value within the input frame. Expressed in range

+of [0-~181.02].

+

+@item SATHIGH

+Display the saturation value at the 90% percentile within the input frame.

+Expressed in range of [0-~181.02].

+

+@item SATMAX

+Display the maximum saturation value contained within the input frame.

+Expressed in range of [0-~181.02].

+

+@item HUEMED

+Display the median value for hue within the input frame. Expressed in range of

+[0-360].

+

+@item HUEAVG

+Display the average value for hue within the input frame. Expressed in range of

+[0-360].

+

+@item YDIF

+Display the average of sample value difference between all values of the Y

+plane in the current frame and corresponding values of the previous input frame.

+Expressed in range of [0-255].

+

+@item UDIF

+Display the average of sample value difference between all values of the U

+plane in the current frame and corresponding values of the previous input frame.

+Expressed in range of [0-255].

+

+@item VDIF

+Display the average of sample value difference between all values of the V

+plane in the current frame and corresponding values of the previous input frame.

+Expressed in range of [0-255].

+@end table

+

+The filter accepts the following options:

+

+@table @option

+@item stat

+@item out

+

+@option{stat} specify an additional form of image analysis.

+@option{out} output video with the specified type of pixel highlighted.

+

+Both options accept the following values:

+

+@table @samp

+@item tout

+Identify @var{temporal outliers} pixels. A @var{temporal outlier} is a pixel

+unlike the neighboring pixels of the same field. Examples of temporal outliers

+include the results of video dropouts, head clogs, or tape tracking issues.

+

+@item vrep

+Identify @var{vertical line repetition}. Vertical line repetition includes

+similar rows of pixels within a frame. In born-digital video vertical line

+repetition is common, but this pattern is uncommon in video digitized from an

+analog source. When it occurs in video that results from the digitization of an

+analog source it can indicate concealment from a dropout compensator.

+

+@item brng

+Identify pixels that fall outside of legal broadcast range.

+@end table

+

+@item color, c

+Set the highlight color for the @option{out} option. The default color is

+yellow.

+@end table

+

+@subsection Examples

+

+@itemize

+@item

+Output data of various video metrics:

+@example

+ffprobe -f lavfi movie=example.mov,signalstats="stat=tout+vrep+brng" -show_frames

+@end example

+

+@item

+Output specific data about the minimum and maximum values of the Y plane per frame:

+@example

+ffprobe -f lavfi movie=example.mov,signalstats -show_entries frame_tags=lavfi.signalstats.YMAX,lavfi.signalstats.YMIN

+@end example

+

+@item

+Playback video while highlighting pixels that are outside of broadcast range in red.

+@example

+ffplay example.mov -vf values="out=brng:color=red"

+@end example

+@end itemize

+

 @anchor{smartblur}

 @section smartblur

@@ -174,6 +174,7 @@ OBJS-$(CONFIG_SETSAR_FILTER)                 += vf_aspect.o

 OBJS-$(CONFIG_SETTB_FILTER)                  += settb.o

 OBJS-$(CONFIG_SHOWINFO_FILTER)               += vf_showinfo.o

 OBJS-$(CONFIG_SHUFFLEPLANES_FILTER)          += vf_shuffleplanes.o

+OBJS-$(CONFIG_SIGNALSTATS_FILTER)            += vf_signalstats.o

 OBJS-$(CONFIG_SMARTBLUR_FILTER)              += vf_smartblur.o

 OBJS-$(CONFIG_SPLIT_FILTER)                  += split.o

 OBJS-$(CONFIG_SPP_FILTER)                    += vf_spp.o

@@ -191,6 +191,7 @@ void avfilter_register_all(void)

     REGISTER_FILTER(SETTB,          settb,          vf);

     REGISTER_FILTER(SHOWINFO,       showinfo,       vf);

     REGISTER_FILTER(SHUFFLEPLANES,  shuffleplanes,  vf);

+    REGISTER_FILTER(SIGNALSTATS,    signalstats,    vf);

     REGISTER_FILTER(SMARTBLUR,      smartblur,      vf);

     REGISTER_FILTER(SPLIT,          split,          vf);

     REGISTER_FILTER(SPP,            spp,            vf);

@@ -30,7 +30,7 @@

 #include "libavutil/version.h"

 #define LIBAVFILTER_VERSION_MAJOR   4

-#define LIBAVFILTER_VERSION_MINOR   7

+#define LIBAVFILTER_VERSION_MINOR   8

 #define LIBAVFILTER_VERSION_MICRO 100

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

new file mode 100644

@@ -0,0 +1,478 @@

+/*

+ * Copyright (c) 2010 Mark Heath mjpeg0 @ silicontrip dot org

+ * Copyright (c) 2014 Clément Bœsch

+ * Copyright (c) 2014 Dave Rice @dericed

+ *

+ * 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 "libavutil/opt.h"

+#include "libavutil/pixdesc.h"

+#include "internal.h"

+

+enum FilterMode {

+    FILTER_NONE = -1,

+    FILTER_TOUT,

+    FILTER_VREP,

+    FILTER_BRNG,

+    FILT_NUMB

+};

+

+typedef struct {

+    const AVClass *class;

+    int chromah;    // height of chroma plane

+    int chromaw;    // width of chroma plane

+    int hsub;       // horizontal subsampling

+    int vsub;       // vertical subsampling

+    int fs;         // pixel count per frame

+    int cfs;        // pixel count per frame of chroma planes

+    enum FilterMode outfilter;

+    int filters;

+    AVFrame *frame_prev;

+    char *vrep_line;

+    uint8_t rgba_color[4];

+    int yuv_color[3];

+} SignalstatsContext;

+

+#define OFFSET(x) offsetof(SignalstatsContext, x)

+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

+

+static const AVOption signalstats_options[] = {

+    {"stat", "set statistics filters", OFFSET(filters), AV_OPT_TYPE_FLAGS, {.i64=0}, 0, INT_MAX, FLAGS, "filters"},

+        {"tout", "analyze pixels for temporal outliers",                0, AV_OPT_TYPE_CONST, {.i64=1<<FILTER_TOUT}, 0, 0, FLAGS, "filters"},

+        {"vrep", "analyze video lines for vertical line repitition",    0, AV_OPT_TYPE_CONST, {.i64=1<<FILTER_VREP}, 0, 0, FLAGS, "filters"},

+        {"brng", "analyze for pixels outside of broadcast range",       0, AV_OPT_TYPE_CONST, {.i64=1<<FILTER_BRNG}, 0, 0, FLAGS, "filters"},

+    {"out", "set video filter", OFFSET(outfilter), AV_OPT_TYPE_INT, {.i64=FILTER_NONE}, -1, FILT_NUMB-1, FLAGS, "out"},

+        {"tout", "highlight pixels that depict temporal outliers",              0, AV_OPT_TYPE_CONST, {.i64=FILTER_TOUT}, 0, 0, FLAGS, "out"},

+        {"vrep", "highlight video lines that depict vertical line repitition",  0, AV_OPT_TYPE_CONST, {.i64=FILTER_VREP}, 0, 0, FLAGS, "out"},

+        {"brng", "highlight pixels that are outside of broadcast range",        0, AV_OPT_TYPE_CONST, {.i64=FILTER_BRNG}, 0, 0, FLAGS, "out"},

+    {"c",     "set highlight color", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str="yellow"}, .flags=FLAGS},

+    {"color", "set highlight color", OFFSET(rgba_color), AV_OPT_TYPE_COLOR, {.str="yellow"}, .flags=FLAGS},

+    {NULL}

+};

+

+AVFILTER_DEFINE_CLASS(signalstats);

+

+static av_cold int init(AVFilterContext *ctx)

+{

+    uint8_t r, g, b;

+    SignalstatsContext *s = ctx->priv;

+

+    if (s->outfilter != FILTER_NONE)

+        s->filters |= 1 << s->outfilter;

+

+    r = s->rgba_color[0];

+    g = s->rgba_color[1];

+    b = s->rgba_color[2];

+    s->yuv_color[0] = (( 66*r + 129*g +  25*b + (1<<7)) >> 8) +  16;

+    s->yuv_color[1] = ((-38*r + -74*g + 112*b + (1<<7)) >> 8) + 128;

+    s->yuv_color[2] = ((112*r + -94*g + -18*b + (1<<7)) >> 8) + 128;

+    return 0;

+}

+

+static av_cold void uninit(AVFilterContext *ctx)

+{

+    SignalstatsContext *s = ctx->priv;

+    av_frame_free(&s->frame_prev);

+    av_freep(&s->vrep_line);

+}

+

+static int query_formats(AVFilterContext *ctx)

+{

+    // TODO: add more

+    enum AVPixelFormat pix_fmts[] = {

+        AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P,

+        AV_PIX_FMT_NONE

+    };

+

+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));

+    return 0;

+}

+

+static int config_props(AVFilterLink *outlink)

+{

+    AVFilterContext *ctx = outlink->src;

+    SignalstatsContext *s = ctx->priv;

+    AVFilterLink *inlink = outlink->src->inputs[0];

+    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);

+    s->hsub = desc->log2_chroma_w;

+    s->vsub = desc->log2_chroma_h;

+

+    outlink->w = inlink->w;

+    outlink->h = inlink->h;

+

+    s->chromaw = FF_CEIL_RSHIFT(inlink->w, s->hsub);

+    s->chromah = FF_CEIL_RSHIFT(inlink->h, s->vsub);

+

+    s->fs = inlink->w * inlink->h;

+    s->cfs = s->chromaw * s->chromah;

+

+    if (s->filters & 1<<FILTER_VREP) {

+        s->vrep_line = av_malloc(inlink->h * sizeof(*s->vrep_line));

+        if (!s->vrep_line)

+            return AVERROR(ENOMEM);

+    }

+

+    return 0;

+}

+

+static void burn_frame(SignalstatsContext *s, AVFrame *f, int x, int y)

+{

+    const int chromax = x >> s->hsub;

+    const int chromay = y >> s->vsub;

+    f->data[0][y       * f->linesize[0] +       x] = s->yuv_color[0];

+    f->data[1][chromay * f->linesize[1] + chromax] = s->yuv_color[1];

+    f->data[2][chromay * f->linesize[2] + chromax] = s->yuv_color[2];

+}

+

+static int filter_brng(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h)

+{

+    int x, score = 0;

+    const int yc = y >> s->vsub;

+    const uint8_t *pluma    = &in->data[0][y  * in->linesize[0]];

+    const uint8_t *pchromau = &in->data[1][yc * in->linesize[1]];

+    const uint8_t *pchromav = &in->data[2][yc * in->linesize[2]];

+

+    for (x = 0; x < w; x++) {

+        const int xc = x >> s->hsub;

+        const int luma    = pluma[x];

+        const int chromau = pchromau[xc];

+        const int chromav = pchromav[xc];

+        const int filt = luma    < 16 || luma    > 235 ||

+                         chromau < 16 || chromau > 240 ||

+                         chromav < 16 || chromav > 240;

+        score += filt;

+        if (out && filt)

+            burn_frame(s, out, x, y);

+    }

+    return score;

+}

+

+static int filter_tout_outlier(uint8_t x, uint8_t y, uint8_t z)

+{

+    return ((abs(x - y) + abs (z - y)) / 2) - abs(z - x) > 4; // make 4 configurable?

+}

+

+static int filter_tout(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h)

+{

+    const uint8_t *p = in->data[0];

+    int lw = in->linesize[0];

+    int x, score = 0, filt;

+

+    if (y - 1 < 0 || y + 1 >= h)

+        return 0;

+

+    // detect two pixels above and below (to eliminate interlace artefacts)

+    // should check that video format is infact interlaced.

+

+#define FILTER(i, j) \

+filter_tout_outlier(p[(y-j) * lw + x + i], \

+                    p[    y * lw + x + i], \

+                    p[(y+j) * lw + x + i])

+

+#define FILTER3(j) (FILTER(-1, j) && FILTER(0, j) && FILTER(1, j))

+

+    if (y - 2 >= 0 && y + 2 < h) {

+        for (x = 1; x < w - 1; x++) {

+            filt = FILTER3(2) && FILTER3(1);

+            score += filt;

+            if (filt && out)

+                burn_frame(s, out, x, y);

+        }

+    } else {

+        for (x = 1; x < w - 1; x++) {

+            filt = FILTER3(1);

+            score += filt;

+            if (filt && out)

+                burn_frame(s, out, x, y);

+        }

+    }

+    return score;

+}

+

+#define VREP_START 4

+

+static void filter_init_vrep(SignalstatsContext *s, const AVFrame *p, int w, int h)

+{

+    int i, y;

+    int lw = p->linesize[0];

+

+    for (y = VREP_START; y < h; y++) {

+        int totdiff = 0;

+        int y2lw = (y - VREP_START) * lw;

+        int ylw = y * lw;

+

+        for (i = 0; i < w; i++)

+            totdiff += abs(p->data[0][y2lw + i] - p->data[0][ylw + i]);

+

+        /* this value should be definable */

+        s->vrep_line[y] = totdiff < w;

+    }

+}

+

+static int filter_vrep(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h)

+{

+    int x, score = 0;

+

+    if (y < VREP_START)

+        return 0;

+

+    for (x = 0; x < w; x++) {

+        if (s->vrep_line[y]) {

+            score++;

+            if (out)

+                burn_frame(s, out, x, y);

+        }

+    }

+    return score;

+}

+

+static const struct {

+    const char *name;

+    void (*init)(SignalstatsContext *s, const AVFrame *p, int w, int h);

+    int (*process)(SignalstatsContext *s, const AVFrame *in, AVFrame *out, int y, int w, int h);

+} filters_def[] = {

+    {"TOUT", NULL,              filter_tout},

+    {"VREP", filter_init_vrep,  filter_vrep},

+    {"BRNG", NULL,              filter_brng},

+    {NULL}

+};

+

+#define DEPTH 256

+

+static int filter_frame(AVFilterLink *link, AVFrame *in)

+{

+    SignalstatsContext *s = link->dst->priv;

+    AVFilterLink *outlink = link->dst->outputs[0];

+    AVFrame *out = in;

+    int i, j;

+    int  w = 0,  cw = 0, // in

+        pw = 0, cpw = 0; // prev

+    int yuv, yuvu, yuvv;

+    int fil;

+    char metabuf[128];

+    unsigned int histy[DEPTH] = {0},

+                 histu[DEPTH] = {0},

+                 histv[DEPTH] = {0},

+                 histhue[360] = {0},

+                 histsat[DEPTH] = {0}; // limited to 8 bit data.

+    int miny  = -1, minu  = -1, minv  = -1;

+    int maxy  = -1, maxu  = -1, maxv  = -1;

+    int lowy  = -1, lowu  = -1, lowv  = -1;

+    int highy = -1, highu = -1, highv = -1;

+    int minsat = -1, maxsat = -1, lowsat = -1, highsat = -1;

+    int lowp, highp, clowp, chighp;

+    int accy, accu, accv;

+    int accsat, acchue = 0;

+    int medhue, maxhue;

+    int toty = 0, totu = 0, totv = 0, totsat=0;

+    int tothue = 0;

+    int dify = 0, difu = 0, difv = 0;

+

+    int filtot[FILT_NUMB] = {0};

+    AVFrame *prev;

+

+    if (!s->frame_prev)

+        s->frame_prev = av_frame_clone(in);

+

+    prev = s->frame_prev;

+

+    if (s->outfilter != FILTER_NONE)

+        out = av_frame_clone(in);

+

+    for (fil = 0; fil < FILT_NUMB; fil ++)

+        if ((s->filters & 1<<fil) && filters_def[fil].init)

+            filters_def[fil].init(s, in, link->w, link->h);

+

+    // Calculate luma histogram and difference with previous frame or field.

+    for (j = 0; j < link->h; j++) {

+        for (i = 0; i < link->w; i++) {

+            yuv = in->data[0][w + i];

+            histy[yuv]++;

+            dify += abs(in->data[0][w + i] - prev->data[0][pw + i]);

+        }

+        w  += in->linesize[0];

+        pw += prev->linesize[0];

+    }

+

+    // Calculate chroma histogram and difference with previous frame or field.

+    for (j = 0; j < s->chromah; j++) {

+        for (i = 0; i < s->chromaw; i++) {

+            int sat, hue;

+

+            yuvu = in->data[1][cw+i];

+            yuvv = in->data[2][cw+i];

+            histu[yuvu]++;

+            difu += abs(in->data[1][cw+i] - prev->data[1][cpw+i]);

+            histv[yuvv]++;

+            difv += abs(in->data[2][cw+i] - prev->data[2][cpw+i]);

+

+            // int or round?

+            sat = hypot(yuvu - 128, yuvv - 128);

+            histsat[sat]++;

+            hue = floor((180 / M_PI) * atan2f(yuvu-128, yuvv-128) + 180);

+            histhue[hue]++;

+        }

+        cw  += in->linesize[1];

+        cpw += prev->linesize[1];

+    }

+

+    for (j = 0; j < link->h; j++) {

+        for (fil = 0; fil < FILT_NUMB; fil ++) {

+            if (s->filters & 1<<fil) {

+                AVFrame *dbg = out != in && s->outfilter == fil ? out : NULL;

+                filtot[fil] += filters_def[fil].process(s, in, dbg, j, link->w, link->h);

+            }

+        }

+    }

+

+    // find low / high based on histogram percentile

+    // these only need to be calculated once.

+

+    lowp   = lrint(s->fs  * 10 / 100.);

+    highp  = lrint(s->fs  * 90 / 100.);

+    clowp  = lrint(s->cfs * 10 / 100.);

+    chighp = lrint(s->cfs * 90 / 100.);

+

+    accy = accu = accv = accsat = 0;

+    for (fil = 0; fil < DEPTH; fil++) {

+        if (miny   < 0 && histy[fil])   miny = fil;

+        if (minu   < 0 && histu[fil])   minu = fil;

+        if (minv   < 0 && histv[fil])   minv = fil;

+        if (minsat < 0 && histsat[fil]) minsat = fil;

+

+        if (histy[fil])   maxy   = fil;

+        if (histu[fil])   maxu   = fil;

+        if (histv[fil])   maxv   = fil;

+        if (histsat[fil]) maxsat = fil;

+

+        toty   += histy[fil]   * fil;

+        totu   += histu[fil]   * fil;

+        totv   += histv[fil]   * fil;

+        totsat += histsat[fil] * fil;

+

+        accy   += histy[fil];

+        accu   += histu[fil];

+        accv   += histv[fil];

+        accsat += histsat[fil];

+

+        if (lowy   == -1 && accy   >=  lowp) lowy   = fil;

+        if (lowu   == -1 && accu   >= clowp) lowu   = fil;

+        if (lowv   == -1 && accv   >= clowp) lowv   = fil;

+        if (lowsat == -1 && accsat >= clowp) lowsat = fil;

+

+        if (highy   == -1 && accy   >=  highp) highy   = fil;

+        if (highu   == -1 && accu   >= chighp) highu   = fil;

+        if (highv   == -1 && accv   >= chighp) highv   = fil;

+        if (highsat == -1 && accsat >= chighp) highsat = fil;

+    }

+

+    maxhue = histhue[0];

+    medhue = -1;

+    for (fil = 0; fil < 360; fil++) {

+        tothue += histhue[fil] * fil;

+        acchue += histhue[fil];

+

+        if (medhue == -1 && acchue > s->cfs / 2)

+            medhue = fil;

+        if (histhue[fil] > maxhue) {

+            maxhue = histhue[fil];

+        }

+    }

+

+    av_frame_free(&s->frame_prev);

+    s->frame_prev = av_frame_clone(in);

+

+#define SET_META(key, fmt, val) do {                                \

+    snprintf(metabuf, sizeof(metabuf), fmt, val);                   \

+    av_dict_set(&out->metadata, "lavfi.signalstats." key, metabuf, 0);   \

+} while (0)

+

+    SET_META("YMIN",    "%d", miny);

+    SET_META("YLOW",    "%d", lowy);

+    SET_META("YAVG",    "%g", 1.0 * toty / s->fs);

+    SET_META("YHIGH",   "%d", highy);

+    SET_META("YMAX",    "%d", maxy);

+

+    SET_META("UMIN",    "%d", minu);

+    SET_META("ULOW",    "%d", lowu);

+    SET_META("UAVG",    "%g", 1.0 * totu / s->cfs);

+    SET_META("UHIGH",   "%d", highu);

+    SET_META("UMAX",    "%d", maxu);

+

+    SET_META("VMIN",    "%d", minv);

+    SET_META("VLOW",    "%d", lowv);

+    SET_META("VAVG",    "%g", 1.0 * totv / s->cfs);

+    SET_META("VHIGH",   "%d", highv);

+    SET_META("VMAX",    "%d", maxv);

+

+    SET_META("SATMIN",  "%d", minsat);

+    SET_META("SATLOW",  "%d", lowsat);

+    SET_META("SATAVG",  "%g", 1.0 * totsat / s->cfs);

+    SET_META("SATHIGH", "%d", highsat);

+    SET_META("SATMAX",  "%d", maxsat);

+

+    SET_META("HUEMED",  "%d", medhue);

+    SET_META("HUEAVG",  "%g", 1.0 * tothue / s->cfs);

+

+    SET_META("YDIF",    "%g", 1.0 * dify / s->fs);

+    SET_META("UDIF",    "%g", 1.0 * difu / s->cfs);

+    SET_META("VDIF",    "%g", 1.0 * difv / s->cfs);

+

+    for (fil = 0; fil < FILT_NUMB; fil ++) {

+        if (s->filters & 1<<fil) {

+            char metaname[128];

+            snprintf(metabuf,  sizeof(metabuf),  "%g", 1.0 * filtot[fil] / s->fs);

+            snprintf(metaname, sizeof(metaname), "lavfi.signalstats.%s", filters_def[fil].name);

+            av_dict_set(&out->metadata, metaname, metabuf, 0);

+        }

+    }

+

+    if (in != out)

+        av_frame_free(&in);

+    return ff_filter_frame(outlink, out);

+}

+

+static const AVFilterPad signalstats_inputs[] = {

+    {

+        .name           = "default",

+        .type           = AVMEDIA_TYPE_VIDEO,

+        .filter_frame   = filter_frame,

+    },

+    { NULL }

+};

+

+static const AVFilterPad signalstats_outputs[] = {

+    {

+        .name           = "default",

+        .config_props   = config_props,

+        .type           = AVMEDIA_TYPE_VIDEO,

+    },

+    { NULL }

+};

+

+AVFilter ff_vf_signalstats = {

+    .name          = "signalstats",

+    .description   = "Generate statistics from video analysis.",

+    .init          = init,

+    .uninit        = uninit,

+    .query_formats = query_formats,

+    .priv_size     = sizeof(SignalstatsContext),

+    .inputs        = signalstats_inputs,

+    .outputs       = signalstats_outputs,

+    .priv_class    = &signalstats_class,

+};