From 69d72140accb8f6e61f046fa5b91f0f9c2f52f22 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20B=C5=93sch?= <u@pkh.me>
Date: Sat, 3 May 2014 22:43:20 +0200
Subject: [PATCH] avfilter/phase: add timeline support.

---
 libavfilter/vf_phase.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libavfilter/vf_phase.c b/libavfilter/vf_phase.c
index dd3ecedd10..297ef70ec5 100644
--- a/libavfilter/vf_phase.c
+++ b/libavfilter/vf_phase.c
@@ -243,6 +243,15 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
     int plane, top, y;
     AVFrame *out;
 
+    if (ctx->is_disabled) {
+        av_frame_free(&s->frame);
+        /* we keep a reference to the previous frame so the filter can start
+         * being useful as soon as it's not disabled, avoiding the 1-frame
+         * delay. */
+        s->frame = av_frame_clone(in);
+        return ff_filter_frame(outlink, in);
+    }
+
     out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
     if (!out) {
         av_frame_free(&in);
@@ -311,4 +320,5 @@ AVFilter ff_vf_phase = {
     .query_formats = query_formats,
     .inputs        = phase_inputs,
     .outputs       = phase_outputs,
+    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
 };