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mpeg2decoder: fail early if no input caps have been provided

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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/4066>
This commit is contained in:
He Junyan 2023-02-24 21:12:40 +08:00 committed by GStreamer Marge Bot
parent a0c392fc19
commit 5d4257a4c4
1 changed files with 1 additions and 0 deletions
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subprojects/gst-plugins-bad/gst-libs/gst/codecs/gstmpeg2decoder.c
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@ -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);