h265decoder: fail early if no input caps have been provided

The h265decoder class does not implement the ->parse() virtual function,
and we always need to add the h265parse element before it. So we should
set_needs_format of the decoder to TRUE, then if no parse before it, it
can fail with a "not-negotiated" error early, rather than go on and
generate unexpected error.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4066>

diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/codecs/gsth265decoder.c b/subprojects/gst-plugins-bad/gst-libs/gst/codecs/gsth265decoder.c
index 4731300..201cc6b 100644 (file)
--- a/subprojects/gst-plugins-bad/gst-libs/gst/codecs/gsth265decoder.c
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/codecs/gsth265decoder.c
@@ -218,6 +218,7 @@ gst_h265_decoder_init (GstH265Decoder * self)
   GstH265DecoderPrivate *priv;
 
   gst_video_decoder_set_packetized (GST_VIDEO_DECODER (self), TRUE);
+  gst_video_decoder_set_needs_format (GST_VIDEO_DECODER (self), TRUE);
 
   self->priv = priv = gst_h265_decoder_get_instance_private (self);