mpeg2decoder: fail early if no input caps have been provided

The mpeg2decoder class does not implement the ->parse() virtual function,
and we always need to add the mpegvideoparse 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/4064>
This commit is contained in:
He Junyan 2023-02-24 21:12:40 +08:00
parent 13b36cd4e3
commit a965be8d96

View file

@ -329,6 +329,7 @@ static void
gst_mpeg2_decoder_init (GstMpeg2Decoder * self)
{
gst_video_decoder_set_packetized (GST_VIDEO_DECODER (self), TRUE);
gst_video_decoder_set_needs_format (GST_VIDEO_DECODER (self), TRUE);
self->priv = gst_mpeg2_decoder_get_instance_private (self);