lavfi/trim: remove request frame hack

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/trim.c

@@ -69,7 +69,6 @@ typedef struct TrimContext {
     int64_t next_pts;
 
     int eof;
-    int got_output;
 } TrimContext;
 
 static int init(AVFilterContext *ctx)
@@ -104,22 +103,9 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 }
 
-static int request_frame(AVFilterLink *outlink)
+static int config_output(AVFilterLink *outlink)
 {
-    AVFilterContext *ctx = outlink->src;
-    TrimContext       *s = ctx->priv;
-    int ret;
-
-    s->got_output = 0;
-    while (!s->got_output) {
-        if (s->eof)
-            return AVERROR_EOF;
-
-        ret = ff_request_frame(ctx->inputs[0]);
-        if (ret < 0)
-            return ret;
-    }
-
+    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
     return 0;
 }
 
@@ -182,7 +168,6 @@ static int trim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
     }
 
     s->nb_frames++;
-    s->got_output = 1;
 
     return ff_filter_frame(ctx->outputs[0], frame);
 
@@ -224,7 +209,7 @@ static const AVFilterPad trim_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_VIDEO,
-        .request_frame = request_frame,
+        .config_props  = config_output,
     },
     { NULL }
 };
@@ -346,7 +331,6 @@ static int atrim_filter_frame(AVFilterLink *inlink, AVFrame *frame)
     } else
         frame->nb_samples = end_sample;
 
-    s->got_output = 1;
     return ff_filter_frame(ctx->outputs[0], frame);
 
 drop:
@@ -387,7 +371,7 @@ static const AVFilterPad atrim_outputs[] = {
     {
         .name          = "default",
         .type          = AVMEDIA_TYPE_AUDIO,
-        .request_frame = request_frame,
+        .config_props  = config_output,
     },
     { NULL }
 };