avfilter/af_afwtdn: add internal timeline support

libavfilter/af_afwtdn.c

@@ -998,6 +998,7 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
     is_noise *= in->sample_rate;
     is_noise /= s->nb_samples;
     for (int level = 0; level <= s->levels; level++) {
+        const double percent = ctx->is_disabled ? 0. : s->percent;
         const int length = cp->output_length[level];
         const double scale = sqrt(2.0 * log(length));
 
@@ -1008,7 +1009,7 @@ static int filter_channel(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
 
         noise_filter(stddev[level], cp->output_coefs[level], filter, absmean[level],
                      s->softness, new_stddev[level], length);
-        denoise_level(cp->filter_coefs[level], cp->output_coefs[level], filter, s->percent, length);
+        denoise_level(cp->filter_coefs[level], cp->output_coefs[level], filter, percent, length);
     }
 
     ret = inverse(s, cp->filter_coefs, cp->filter_length, dst, out->nb_samples, ch, s->sn);
@@ -1332,5 +1333,6 @@ const AVFilter ff_af_afwtdn = {
     FILTER_INPUTS(inputs),
     FILTER_OUTPUTS(outputs),
     .process_command = process_command,
-    .flags           = AVFILTER_FLAG_SLICE_THREADS,
+    .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
+                       AVFILTER_FLAG_SLICE_THREADS,
 };