avfilter/vf_signalstats: add >8 bit depth support

1 files changed, 420 insertions, 16 deletions

diff --git a/libavfilter/vf_signalstats.c b/libavfilter/vf_signalstats.c
index c340d6b48d..259b0a180c 100644
--- a/libavfilter/vf_signalstats.c
+++ b/libavfilter/vf_signalstats.c
@@ -20,6 +20,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/intreadwrite.h"
 #include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "internal.h"
@@ -38,6 +39,7 @@ typedef struct {
     int chromaw;    // width of chroma plane
     int hsub;       // horizontal subsampling
     int vsub;       // vertical subsampling
+    int depth;      // pixel depth
     int fs;         // pixel count per frame
     int cfs;        // pixel count per frame of chroma planes
     int outfilter;  // FilterMode
@@ -48,6 +50,8 @@ typedef struct {
     int nb_jobs;
     int *jobs_rets;
 
+    int *histy, *histu, *histv, *histsat;
+
     AVFrame *frame_sat;
     AVFrame *frame_hue;
 } SignalstatsContext;
@@ -105,6 +109,10 @@ static av_cold void uninit(AVFilterContext *ctx)
     av_frame_free(&s->frame_sat);
     av_frame_free(&s->frame_hue);
     av_freep(&s->jobs_rets);
+    av_freep(&s->histy);
+    av_freep(&s->histu);
+    av_freep(&s->histv);
+    av_freep(&s->histsat);
 }
 
 static int query_formats(AVFilterContext *ctx)
@@ -115,6 +123,13 @@ static int query_formats(AVFilterContext *ctx)
         AV_PIX_FMT_YUV440P,
         AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
         AV_PIX_FMT_YUVJ440P,
+        AV_PIX_FMT_YUV444P9, AV_PIX_FMT_YUV422P9, AV_PIX_FMT_YUV420P9,
+        AV_PIX_FMT_YUV444P10, AV_PIX_FMT_YUV422P10, AV_PIX_FMT_YUV420P10,
+        AV_PIX_FMT_YUV440P10,
+        AV_PIX_FMT_YUV444P12, AV_PIX_FMT_YUV422P12, AV_PIX_FMT_YUV420P12,
+        AV_PIX_FMT_YUV440P12,
+        AV_PIX_FMT_YUV444P14, AV_PIX_FMT_YUV422P14, AV_PIX_FMT_YUV420P14,
+        AV_PIX_FMT_YUV444P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV420P16,
         AV_PIX_FMT_NONE
     };
 
@@ -150,6 +165,16 @@ static int config_props(AVFilterLink *outlink)
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
     s->hsub = desc->log2_chroma_w;
     s->vsub = desc->log2_chroma_h;
+    s->depth = desc->comp[0].depth;
+    if (s->depth > 8) {
+        s->histy = av_malloc_array(1 << s->depth, sizeof(*s->histy));
+        s->histu = av_malloc_array(1 << s->depth, sizeof(*s->histu));
+        s->histv = av_malloc_array(1 << s->depth, sizeof(*s->histv));
+        s->histsat = av_malloc_array(1 << s->depth, sizeof(*s->histsat));
+
+        if (!s->histy || !s->histu || !s->histv || !s->histsat)
+            return AVERROR(ENOMEM);
+    }
 
     outlink->w = inlink->w;
     outlink->h = inlink->h;
@@ -173,7 +198,7 @@ static int config_props(AVFilterLink *outlink)
     return 0;
 }
 
-static void burn_frame(const SignalstatsContext *s, AVFrame *f, int x, int y)
+static void burn_frame8(const SignalstatsContext *s, AVFrame *f, int x, int y)
 {
     const int chromax = x >> s->hsub;
     const int chromay = y >> s->vsub;
@@ -182,7 +207,17 @@ static void burn_frame(const SignalstatsContext *s, AVFrame *f, int x, int y)
     f->data[2][chromay * f->linesize[2] + chromax] = s->yuv_color[2];
 }
 
-static int filter_brng(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+static void burn_frame16(const SignalstatsContext *s, AVFrame *f, int x, int y)
+{
+    const int chromax = x >> s->hsub;
+    const int chromay = y >> s->vsub;
+    const int mult = 1 << (s->depth - 8);
+    AV_WN16(f->data[0] + y       * f->linesize[0] +       x * 2, s->yuv_color[0] * mult);
+    AV_WN16(f->data[1] + chromay * f->linesize[1] + chromax * 2, s->yuv_color[1] * mult);
+    AV_WN16(f->data[2] + chromay * f->linesize[2] + chromax * 2, s->yuv_color[2] * mult);
+}
+
+static int filter8_brng(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 {
     ThreadData *td = arg;
     const SignalstatsContext *s = ctx->priv;
@@ -210,7 +245,42 @@ static int filter_brng(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
                 chromav < 16 || chromav > 240;
             score += filt;
             if (out && filt)
-                burn_frame(s, out, x, y);
+                burn_frame8(s, out, x, y);
+        }
+    }
+    return score;
+}
+
+static int filter16_brng(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+    ThreadData *td = arg;
+    const SignalstatsContext *s = ctx->priv;
+    const AVFrame *in = td->in;
+    AVFrame *out = td->out;
+    const int mult = 1 << (s->depth - 8);
+    const int w = in->width;
+    const int h = in->height;
+    const int slice_start = (h *  jobnr   ) / nb_jobs;
+    const int slice_end   = (h * (jobnr+1)) / nb_jobs;
+    int x, y, score = 0;
+
+    for (y = slice_start; y < slice_end; y++) {
+        const int yc = y >> s->vsub;
+        const uint16_t *pluma    = (uint16_t *)&in->data[0][y  * in->linesize[0]];
+        const uint16_t *pchromau = (uint16_t *)&in->data[1][yc * in->linesize[1]];
+        const uint16_t *pchromav = (uint16_t *)&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 * mult || luma    > 235 * mult ||
+                chromau < 16 * mult || chromau > 240 * mult ||
+                chromav < 16 * mult || chromav > 240 * mult;
+            score += filt;
+            if (out && filt)
+                burn_frame16(s, out, x, y);
         }
     }
     return score;
@@ -221,7 +291,7 @@ 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(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+static int filter8_tout(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 {
     ThreadData *td = arg;
     const SignalstatsContext *s = ctx->priv;
@@ -255,14 +325,55 @@ static int filter_tout(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
                 filt = FILTER3(2) && FILTER3(1);
                 score += filt;
                 if (filt && out)
-                    burn_frame(s, out, x, y);
+                    burn_frame8(s, out, x, y);
+            }
+        } else {
+            for (x = 1; x < w - 1; x++) {
+                filt = FILTER3(1);
+                score += filt;
+                if (filt && out)
+                    burn_frame8(s, out, x, y);
+            }
+        }
+    }
+    return score;
+}
+
+static int filter16_tout(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+    ThreadData *td = arg;
+    const SignalstatsContext *s = ctx->priv;
+    const AVFrame *in = td->in;
+    AVFrame *out = td->out;
+    const int w = in->width;
+    const int h = in->height;
+    const int slice_start = (h *  jobnr   ) / nb_jobs;
+    const int slice_end   = (h * (jobnr+1)) / nb_jobs;
+    const uint16_t *p = (uint16_t *)in->data[0];
+    int lw = in->linesize[0] / 2;
+    int x, y, score = 0, filt;
+
+    for (y = slice_start; y < slice_end; y++) {
+
+        if (y - 1 < 0 || y + 1 >= h)
+            continue;
+
+        // detect two pixels above and below (to eliminate interlace artefacts)
+        // should check that video format is infact interlaced.
+
+        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_frame16(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);
+                    burn_frame16(s, out, x, y);
             }
         }
     }
@@ -271,7 +382,7 @@ static int filter_tout(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 
 #define VREP_START 4
 
-static int filter_vrep(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+static int filter8_vrep(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 {
     ThreadData *td = arg;
     const SignalstatsContext *s = ctx->priv;
@@ -300,24 +411,60 @@ static int filter_vrep(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
         score += filt;
         if (filt && out)
             for (x = 0; x < w; x++)
-                burn_frame(s, out, x, y);
+                burn_frame8(s, out, x, y);
+    }
+    return score * w;
+}
+
+static int filter16_vrep(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+    ThreadData *td = arg;
+    const SignalstatsContext *s = ctx->priv;
+    const AVFrame *in = td->in;
+    AVFrame *out = td->out;
+    const int w = in->width;
+    const int h = in->height;
+    const int slice_start = (h *  jobnr   ) / nb_jobs;
+    const int slice_end   = (h * (jobnr+1)) / nb_jobs;
+    const uint16_t *p = (uint16_t *)in->data[0];
+    const int lw = in->linesize[0] / 2;
+    int x, y, score = 0;
+
+    for (y = slice_start; y < slice_end; y++) {
+        const int y2lw = (y - VREP_START) * lw;
+        const int ylw  =  y               * lw;
+        int64_t totdiff = 0;
+        int filt;
+
+        if (y < VREP_START)
+            continue;
+
+        for (x = 0; x < w; x++)
+            totdiff += abs(p[y2lw + x] - p[ylw + x]);
+        filt = totdiff < w;
+
+        score += filt;
+        if (filt && out)
+            for (x = 0; x < w; x++)
+                burn_frame16(s, out, x, y);
     }
     return score * w;
 }
 
 static const struct {
     const char *name;
-    int (*process)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
+    int (*process8)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
+    int (*process16)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
 } filters_def[] = {
-    {"TOUT", filter_tout},
-    {"VREP", filter_vrep},
-    {"BRNG", filter_brng},
+    {"TOUT", filter8_tout, filter16_tout},
+    {"VREP", filter8_vrep, filter16_vrep},
+    {"BRNG", filter8_brng, filter16_brng},
     {NULL}
 };
 
 #define DEPTH 256
 
-static int compute_sat_hue_metrics(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+static int compute_sat_hue_metrics8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
 {
     int i, j;
     ThreadDataHueSatMetrics *td = arg;
@@ -355,7 +502,46 @@ static int compute_sat_hue_metrics(AVFilterContext *ctx, void *arg, int jobnr, i
     return 0;
 }
 
-static int filter_frame(AVFilterLink *link, AVFrame *in)
+static int compute_sat_hue_metrics16(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+    int i, j;
+    ThreadDataHueSatMetrics *td = arg;
+    const SignalstatsContext *s = ctx->priv;
+    const AVFrame *src = td->src;
+    AVFrame *dst_sat = td->dst_sat;
+    AVFrame *dst_hue = td->dst_hue;
+    const int mid = 1 << (s->depth - 1);
+
+    const int slice_start = (s->chromah *  jobnr   ) / nb_jobs;
+    const int slice_end   = (s->chromah * (jobnr+1)) / nb_jobs;
+
+    const int lsz_u = src->linesize[1] / 2;
+    const int lsz_v = src->linesize[2] / 2;
+    const uint16_t *p_u = (uint16_t*)src->data[1] + slice_start * lsz_u;
+    const uint16_t *p_v = (uint16_t*)src->data[2] + slice_start * lsz_v;
+
+    const int lsz_sat = dst_sat->linesize[0] / 2;
+    const int lsz_hue = dst_hue->linesize[0] / 2;
+    uint16_t *p_sat = (uint16_t*)dst_sat->data[0] + slice_start * lsz_sat;
+    uint16_t *p_hue = (uint16_t*)dst_hue->data[0] + slice_start * lsz_hue;
+
+    for (j = slice_start; j < slice_end; j++) {
+        for (i = 0; i < s->chromaw; i++) {
+            const int yuvu = p_u[i];
+            const int yuvv = p_v[i];
+            p_sat[i] = hypot(yuvu - mid, yuvv - mid); // int or round?
+            ((int16_t*)p_hue)[i] = floor((180 / M_PI) * atan2f(yuvu-mid, yuvv-mid) + 180);
+        }
+        p_u   += lsz_u;
+        p_v   += lsz_v;
+        p_sat += lsz_sat;
+        p_hue += lsz_hue;
+    }
+
+    return 0;
+}
+
+static int filter_frame8(AVFilterLink *link, AVFrame *in)
 {
     AVFilterContext *ctx = link->dst;
     SignalstatsContext *s = ctx->priv;
@@ -409,7 +595,7 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
         av_frame_make_writable(out);
     }
 
-    ctx->internal->execute(ctx, compute_sat_hue_metrics, &td_huesat,
+    ctx->internal->execute(ctx, compute_sat_hue_metrics8, &td_huesat,
                            NULL, FFMIN(s->chromah, ctx->graph->nb_threads));
 
     // Calculate luma histogram and difference with previous frame or field.
@@ -449,7 +635,7 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
                 .out = out != in && s->outfilter == fil ? out : NULL,
             };
             memset(s->jobs_rets, 0, s->nb_jobs * sizeof(*s->jobs_rets));
-            ctx->internal->execute(ctx, filters_def[fil].process,
+            ctx->internal->execute(ctx, filters_def[fil].process8,
                                    &td, s->jobs_rets, s->nb_jobs);
             for (i = 0; i < s->nb_jobs; i++)
                 filtot[fil] += s->jobs_rets[i];
@@ -563,6 +749,224 @@ static int filter_frame(AVFilterLink *link, AVFrame *in)
     return ff_filter_frame(outlink, out);
 }
 
+static int filter_frame16(AVFilterLink *link, AVFrame *in)
+{
+    AVFilterContext *ctx = link->dst;
+    SignalstatsContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    AVFrame *out = in;
+    int i, j;
+    int  w = 0,  cw = 0, // in
+        pw = 0, cpw = 0; // prev
+    int fil;
+    char metabuf[128];
+    unsigned int *histy = s->histy,
+                 *histu = s->histu,
+                 *histv = s->histv,
+                 histhue[360] = {0},
+                 *histsat = s->histsat;
+    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;
+    int64_t toty = 0, totu = 0, totv = 0, totsat=0;
+    int64_t tothue = 0;
+    int64_t dify = 0, difu = 0, difv = 0;
+
+    int filtot[FILT_NUMB] = {0};
+    AVFrame *prev;
+
+    AVFrame *sat = s->frame_sat;
+    AVFrame *hue = s->frame_hue;
+    const uint8_t *p_sat = sat->data[0];
+    const uint8_t *p_hue = hue->data[0];
+    const int lsz_sat = sat->linesize[0];
+    const int lsz_hue = hue->linesize[0];
+    ThreadDataHueSatMetrics td_huesat = {
+        .src     = in,
+        .dst_sat = sat,
+        .dst_hue = hue,
+    };
+
+    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);
+        av_frame_make_writable(out);
+    }
+
+    ctx->internal->execute(ctx, compute_sat_hue_metrics16, &td_huesat,
+                           NULL, FFMIN(s->chromah, ctx->graph->nb_threads));
+
+    // Calculate luma histogram and difference with previous frame or field.
+    memset(s->histy, 0, (1 << s->depth) * sizeof(*s->histy));
+    for (j = 0; j < link->h; j++) {
+        for (i = 0; i < link->w; i++) {
+            const int yuv = AV_RN16(in->data[0] + w + i * 2);
+            histy[yuv]++;
+            dify += abs(yuv - AV_RN16(prev->data[0] + pw + i * 2));
+        }
+        w  += in->linesize[0];
+        pw += prev->linesize[0];
+    }
+
+    // Calculate chroma histogram and difference with previous frame or field.
+    memset(s->histu, 0, (1 << s->depth) * sizeof(*s->histu));
+    memset(s->histv, 0, (1 << s->depth) * sizeof(*s->histv));
+    memset(s->histsat, 0, (1 << s->depth) * sizeof(*s->histsat));
+    for (j = 0; j < s->chromah; j++) {
+        for (i = 0; i < s->chromaw; i++) {
+            const int yuvu = AV_RN16(in->data[1] + cw + i * 2);
+            const int yuvv = AV_RN16(in->data[2] + cw + i * 2);
+            histu[yuvu]++;
+            difu += abs(yuvu - AV_RN16(prev->data[1] + cpw + i * 2));
+            histv[yuvv]++;
+            difv += abs(yuvv - AV_RN16(prev->data[2] + cpw + i * 2));
+
+            histsat[p_sat[i]]++;
+            histhue[((int16_t*)p_hue)[i]]++;
+        }
+        cw  += in->linesize[1];
+        cpw += prev->linesize[1];
+        p_sat += lsz_sat;
+        p_hue += lsz_hue;
+    }
+
+    for (fil = 0; fil < FILT_NUMB; fil ++) {
+        if (s->filters & 1<<fil) {
+            ThreadData td = {
+                .in = in,
+                .out = out != in && s->outfilter == fil ? out : NULL,
+            };
+            memset(s->jobs_rets, 0, s->nb_jobs * sizeof(*s->jobs_rets));
+            ctx->internal->execute(ctx, filters_def[fil].process16,
+                                   &td, s->jobs_rets, s->nb_jobs);
+            for (i = 0; i < s->nb_jobs; i++)
+                filtot[fil] += s->jobs_rets[i];
+        }
+    }
+
+    // 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 < 1 << s->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);
+
+    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 int filter_frame(AVFilterLink *link, AVFrame *in)
+{
+    AVFilterContext *ctx = link->dst;
+    SignalstatsContext *s = ctx->priv;
+
+    if (s->depth > 8)
+        return filter_frame16(link, in);
+    else
+        return filter_frame8(link, in);
+}
+
 static const AVFilterPad signalstats_inputs[] = {
     {
         .name           = "default",