avfilter/vf_limiter: add slice threading

libavfilter/vf_limiter.c

@@ -28,6 +28,11 @@
 #include "limiter.h"
 #include "video.h"
 
+typedef struct ThreadData {
+    AVFrame *in;
+    AVFrame *out;
+} ThreadData;
+
 typedef struct LimiterContext {
     const AVClass *class;
     int min;
@@ -161,13 +166,46 @@ static int config_props(AVFilterLink *inlink)
     return 0;
 }
 
+static int filter_slice(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
+{
+    LimiterContext *s = ctx->priv;
+    ThreadData *td = arg;
+    AVFrame *in = td->in;
+    AVFrame *out = td->out;
+    int p;
+
+    for (p = 0; p < s->nb_planes; p++) {
+        const int h = s->height[p];
+        const int slice_start = (h * jobnr) / nb_jobs;
+        const int slice_end = (h * (jobnr+1)) / nb_jobs;
+
+        if (!((1 << p) & s->planes)) {
+            if (out != in)
+                av_image_copy_plane(out->data[p] + slice_start * out->linesize[p],
+                                    out->linesize[p],
+                                    in->data[p] + slice_start * in->linesize[p],
+                                    in->linesize[p],
+                                    s->linesize[p], slice_end - slice_start);
+            continue;
+        }
+
+        s->dsp.limiter(in->data[p] + slice_start * in->linesize[p],
+                       out->data[p] + slice_start * out->linesize[p],
+                       in->linesize[p], out->linesize[p],
+                       s->width[p], slice_end - slice_start,
+                       s->min, s->max);
+    }
+
+    return 0;
+}
+
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
     AVFilterContext *ctx = inlink->dst;
     LimiterContext *s = ctx->priv;
     AVFilterLink *outlink = ctx->outputs[0];
+    ThreadData td;
     AVFrame *out;
-    int p;
 
     if (av_frame_is_writable(in)) {
         out = in;
@@ -180,20 +218,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
         av_frame_copy_props(out, in);
     }
 
-    for (p = 0; p < s->nb_planes; p++) {
-        if (!((1 << p) & s->planes)) {
-            if (out != in)
-                av_image_copy_plane(out->data[p], out->linesize[p], in->data[p], in->linesize[p],
-                                    s->linesize[p], s->height[p]);
-            continue;
-        }
-
-        s->dsp.limiter(in->data[p], out->data[p],
-                       in->linesize[p], out->linesize[p],
-                       s->width[p], s->height[p],
-                       s->min, s->max);
-    }
-
+    td.out = out;
+    td.in = in;
+    ctx->internal->execute(ctx, filter_slice, &td, NULL,
+                           FFMIN(s->height[2], ff_filter_get_nb_threads(ctx)));
     if (out != in)
         av_frame_free(&in);
 
@@ -227,5 +255,5 @@ AVFilter ff_vf_limiter = {
     .query_formats = query_formats,
     .inputs        = inputs,
     .outputs       = outputs,
-    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
 };