avfilter/vf_lagfun: add timeline support

libavfilter/vf_lagfun.c

@@ -104,8 +104,12 @@ static int lagfun_frame8(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
                 float v = FFMAX(src[x], osrc[x] * decay);
 
                 osrc[x] = v;
+                if (ctx->is_disabled) {
+                    dst[x] = src[x];
+                } else {
                     dst[x] = lrintf(v);
                 }
+            }
 
             src += in->linesize[p];
             osrc += s->planewidth[p];
@@ -143,8 +147,12 @@ static int lagfun_frame16(AVFilterContext *ctx, void *arg, int jobnr, int nb_job
                 float v = FFMAX(src[x], osrc[x] * decay);
 
                 osrc[x] = v;
+                if (ctx->is_disabled) {
+                    dst[x] = src[x];
+                } else {
                     dst[x] = lrintf(v);
                 }
+            }
 
             src += in->linesize[p] / 2;
             osrc += s->planewidth[p];
@@ -256,6 +264,6 @@ AVFilter ff_vf_lagfun = {
     .uninit        = uninit,
     .outputs       = outputs,
     .inputs        = inputs,
-    .flags         = AVFILTER_FLAG_SLICE_THREADS,
+    .flags         = AVFILTER_FLAG_SLICE_THREADS | AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
     .process_command = ff_filter_process_command,
 };