avfilter/asrc_hilbert: switch to activate

Allow to set the EOF timestamp.

libavfilter/asrc_hilbert.c

@@ -23,6 +23,7 @@
 #include "audio.h"
 #include "avfilter.h"
 #include "internal.h"
+#include "filters.h"
 #include "window_func.h"
 
 typedef struct HilbertContext {
@@ -143,16 +144,21 @@ static av_cold int config_props(AVFilterLink *outlink)
     return 0;
 }
 
-static int request_frame(AVFilterLink *outlink)
+static int activate(AVFilterContext *ctx)
 {
-    AVFilterContext *ctx = outlink->src;
+    AVFilterLink *outlink = ctx->outputs[0];
     HilbertContext *s = ctx->priv;
     AVFrame *frame;
     int nb_samples;
 
+    if (!ff_outlink_frame_wanted(outlink))
+        return FFERROR_NOT_READY;
+
     nb_samples = FFMIN(s->nb_samples, s->nb_taps - s->pts);
-    if (!nb_samples)
-        return AVERROR_EOF;
+    if (nb_samples <= 0) {
+        ff_outlink_set_status(outlink, AVERROR_EOF, s->pts);
+        return 0;
+    }
 
     if (!(frame = ff_get_audio_buffer(outlink, nb_samples)))
         return AVERROR(ENOMEM);
@@ -168,7 +174,6 @@ static const AVFilterPad hilbert_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_AUDIO,
-        .request_frame = request_frame,
         .config_props  = config_props,
     },
 };
@@ -179,6 +184,7 @@ const AVFilter ff_asrc_hilbert = {
     .query_formats = query_formats,
     .init          = init,
     .uninit        = uninit,
+    .activate      = activate,
     .priv_size     = sizeof(HilbertContext),
     .inputs        = NULL,
     FILTER_OUTPUTS(hilbert_outputs),