From f74524b58d99fd85ab7a5ec33093f963cc59cad5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian@centricular.com>
Date: Fri, 8 May 2015 15:02:48 +0200
Subject: [PATCH] videodecoder: Also negotiate with downstream if needed before
 handling a GAP event

---
 gst-libs/gst/video/gstvideodecoder.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/gst-libs/gst/video/gstvideodecoder.c b/gst-libs/gst/video/gstvideodecoder.c
index 8465f803f9..3420b1c7d0 100644
--- a/gst-libs/gst/video/gstvideodecoder.c
+++ b/gst-libs/gst/video/gstvideodecoder.c
@@ -1105,13 +1105,6 @@ gst_video_decoder_negotiate_default_caps (GstVideoDecoder * decoder)
   gst_video_codec_state_unref (state);
   gst_caps_unref (caps);
 
-  if (!gst_video_decoder_negotiate (decoder)) {
-    GST_INFO_OBJECT (decoder,
-        "Failed to negotiate default caps for initial gap");
-    gst_pad_mark_reconfigure (decoder->srcpad);
-    return FALSE;
-  }
-
   return TRUE;
 
 caps_error:
@@ -1213,6 +1206,7 @@ gst_video_decoder_sink_event_default (GstVideoDecoder * decoder,
     case GST_EVENT_GAP:
     {
       GstFlowReturn flow_ret = GST_FLOW_OK;
+      gboolean needs_reconfigure = FALSE;
 
       flow_ret = gst_video_decoder_drain_out (decoder, FALSE);
       ret = (flow_ret == GST_FLOW_OK);
@@ -1227,6 +1221,16 @@ gst_video_decoder_sink_event_default (GstVideoDecoder * decoder,
           forward_immediate = TRUE;
           break;
         }
+        needs_reconfigure = TRUE;
+      }
+
+      needs_reconfigure = gst_pad_check_reconfigure (decoder->srcpad)
+          || needs_reconfigure;
+      if (decoder->priv->output_state_changed || needs_reconfigure) {
+        if (!gst_video_decoder_negotiate_unlocked (decoder)) {
+          GST_WARNING_OBJECT (decoder, "Failed to negotiate with downstream");
+          gst_pad_mark_reconfigure (decoder->srcpad);
+        }
       }
       GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);