lavfi: add bench and abench filters

Changelog

@@ -8,6 +8,7 @@ version <next>:
 - Bob Weaver deinterlacing filter
 - firequalizer filter
 - datascope filter
+- bench and abench filters
 
 
 version 3.0:

doc/filters.texi

@@ -10874,6 +10874,7 @@ Scale a subtitle stream to match the main video in size before overlaying
 @end example
 @end itemize
 
+@anchor{selectivecolor}
 @section selectivecolor
 
 Adjust cyan, magenta, yellow and black (CMYK) to certain ranges of colors (such
@@ -14289,6 +14290,40 @@ ffplay -f lavfi 'amovie=input.mp3, asplit [a][out1];
 @end example
 @end itemize
 
+@section bench, abench
+
+Benchmark part of a filtergraph.
+
+The filter accepts the following options:
+
+@table @option
+@item action
+Start or stop a timer.
+
+Available values are:
+@table @samp
+@item start
+Get the current time, set it as frame metadata (using the key
+@code{lavfi.bench.start_time}), and forward the frame to the next filter.
+
+@item stop
+Get the current time and fetch the @code{lavfi.bench.start_time} metadata from
+the input frame metadata to get the time difference. Time difference, average,
+maximum and minimum time (respectively @code{t}, @code{avg}, @code{max} and
+@code{min}) are then printed. The timestamps are expressed in seconds.
+@end table
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Benchmark @ref{selectivecolor} filter:
+@example
+bench=start,selectivecolor=reds=-.2 .12 -.49,bench=stop
+@end example
+@end itemize
+
 @section concat
 
 Concatenate audio and video streams, joining them together one after the

libavfilter/Makefile

@@ -24,6 +24,7 @@ OBJS = allfilters.o                                                     \
        transform.o                                                      \
        video.o                                                          \
 
+OBJS-$(CONFIG_ABENCH_FILTER)                 += f_bench.o
 OBJS-$(CONFIG_ACOMPRESSOR_FILTER)            += af_sidechaincompress.o
 OBJS-$(CONFIG_ACROSSFADE_FILTER)             += af_afade.o
 OBJS-$(CONFIG_ADELAY_FILTER)                 += af_adelay.o
@@ -116,6 +117,7 @@ OBJS-$(CONFIG_ALPHAEXTRACT_FILTER)           += vf_extractplanes.o
 OBJS-$(CONFIG_ALPHAMERGE_FILTER)             += vf_alphamerge.o
 OBJS-$(CONFIG_ATADENOISE_FILTER)             += vf_atadenoise.o
 OBJS-$(CONFIG_BBOX_FILTER)                   += bbox.o vf_bbox.o
+OBJS-$(CONFIG_BENCH_FILTER)                  += f_bench.o
 OBJS-$(CONFIG_BLACKDETECT_FILTER)            += vf_blackdetect.o
 OBJS-$(CONFIG_BLACKFRAME_FILTER)             += vf_blackframe.o
 OBJS-$(CONFIG_BLEND_FILTER)                  += vf_blend.o dualinput.o framesync.o

libavfilter/allfilters.c

@@ -45,6 +45,7 @@ void avfilter_register_all(void)
         return;
     initialized = 1;
 
+    REGISTER_FILTER(ABENCH,         abench,         af);
     REGISTER_FILTER(ACOMPRESSOR,    acompressor,    af);
     REGISTER_FILTER(ACROSSFADE,     acrossfade,     af);
     REGISTER_FILTER(ADELAY,         adelay,         af);
@@ -136,6 +137,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(ALPHAMERGE,     alphamerge,     vf);
     REGISTER_FILTER(ATADENOISE,     atadenoise,     vf);
     REGISTER_FILTER(ASS,            ass,            vf);
+    REGISTER_FILTER(BENCH,          bench,          vf);
     REGISTER_FILTER(BBOX,           bbox,           vf);
     REGISTER_FILTER(BLACKDETECT,    blackdetect,    vf);
     REGISTER_FILTER(BLACKFRAME,     blackframe,     vf);

libavfilter/f_bench.c

@@ -0,0 +1,151 @@
+/*
+ * 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/time.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+
+enum BenchAction {
+    ACTION_START,
+    ACTION_STOP,
+    NB_ACTION
+};
+
+typedef struct {
+    const AVClass *class;
+    int action;
+    int64_t max, min;
+    int64_t sum;
+    int n;
+} BenchContext;
+
+#define OFFSET(x) offsetof(BenchContext, x)
+#define DEFINE_OPTIONS(filt_name, FLAGS)                                                                                \
+static const AVOption filt_name##_options[] = {                                                                         \
+    { "action", "set action", OFFSET(action), AV_OPT_TYPE_INT, {.i64=ACTION_START}, 0, NB_ACTION-1, FLAGS, "action" },  \
+        { "start", "start timer",  0, AV_OPT_TYPE_CONST, {.i64=ACTION_START}, INT_MIN, INT_MAX, FLAGS, "action" },      \
+        { "stop",  "stop timer",   0, AV_OPT_TYPE_CONST, {.i64=ACTION_STOP},  INT_MIN, INT_MAX, FLAGS, "action" },      \
+    { NULL }                                                                                                            \
+}
+
+#define START_TIME_KEY "lavfi.bench.start_time"
+#define T2F(v) ((v) / 1000000.)
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    BenchContext *s = ctx->priv;
+    s->min = INT64_MAX;
+    s->max = INT64_MIN;
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    BenchContext *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    const int64_t t = av_gettime();
+
+    if (t < 0)
+        return ff_filter_frame(outlink, in);
+
+    if (s->action == ACTION_START) {
+        av_dict_set_int(&in->metadata, START_TIME_KEY, t, 0);
+    } else if (s->action = ACTION_STOP) {
+        AVDictionaryEntry *e = av_dict_get(in->metadata, START_TIME_KEY, NULL, 0);
+        if (e) {
+            const int64_t start = strtoll(e->value, NULL, 0);
+            const int64_t diff = t - start;
+            s->sum += diff;
+            s->n++;
+            s->min = FFMIN(s->min, diff);
+            s->max = FFMAX(s->max, diff);
+            av_log(s, AV_LOG_INFO, "t:%f avg:%f max:%f min:%f\n",
+                   T2F(diff), T2F(s->sum / s->n), T2F(s->max), T2F(s->min));
+        }
+        av_dict_set(&in->metadata, START_TIME_KEY, NULL, 0);
+    }
+
+    return ff_filter_frame(outlink, in);
+}
+
+#if CONFIG_BENCH_FILTER
+DEFINE_OPTIONS(bench, AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM);
+AVFILTER_DEFINE_CLASS(bench);
+
+static const AVFilterPad bench_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad bench_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_bench = {
+    .name          = "bench",
+    .description   = NULL_IF_CONFIG_SMALL("Benchmark part of a filtergraph."),
+    .priv_size     = sizeof(BenchContext),
+    .init          = init,
+    .inputs        = bench_inputs,
+    .outputs       = bench_outputs,
+    .priv_class    = &bench_class,
+};
+#endif /* CONFIG_BENCH_FILTER */
+
+#if CONFIG_ABENCH_FILTER
+DEFINE_OPTIONS(abench, AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM);
+AVFILTER_DEFINE_CLASS(abench);
+
+static const AVFilterPad abench_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_AUDIO,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad abench_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_AUDIO,
+    },
+    { NULL }
+};
+
+AVFilter ff_af_abench = {
+    .name          = "abench",
+    .description   = NULL_IF_CONFIG_SMALL("Benchmark part of a filtergraph."),
+    .priv_size     = sizeof(BenchContext),
+    .init          = init,
+    .inputs        = abench_inputs,
+    .outputs       = abench_outputs,
+    .priv_class    = &abench_class,
+};
+#endif /* CONFIG_ABENCH_FILTER */

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR   6
-#define LIBAVFILTER_VERSION_MINOR  37
+#define LIBAVFILTER_VERSION_MINOR  38
 #define LIBAVFILTER_VERSION_MICRO 100
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \