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rtpmp4adepay: Should reject caps without codec configuration

Submitted by Peter Maersk-Moller

Link to original bug (#766267)

Description

Trying to RTP stream AAC audio fails. The modules aacparse, avdec_aac or decodebin all fails to output packets. Probable cause is something with rtpmp4apay/rtpmp4adepay.

Scripts documenting the problem:

Sender (one of the following):
$ AUDIO='audio/x-raw,rate=48000,channels=2'
$ gst-launch-1.0 -v audiotestsrc is-live=1 ! $AUDIO ! faac ! queue ! rtpmp4apay ! udpsink host=127.0.0.1 port=14002
$ gst-launch-1.0 -v audiotestsrc is-live=1 ! $AUDIO ! avenc_aac ! queue ! rtpmp4apay ! udpsink host=127.0.0.1 port=14002
$ gst-launch-1.0 -v audiotestsrc is-live=1 ! $AUDIO ! avenc_aac compliance=-2 ! queue ! rtpmp4apay ! udpsink host=127.0.0.1 port=14002

Receiver:
$ gst-launch-1.0 -v udpsrc port=14002 caps="application/x-rtp,media=audio,payload=96,clock-rate=48000,encoding-name=MP4A-LATM" do-timestamp=1 ! rtpmp4adepay ! aacparse ! identity silent=0 ! fakesink

At the receiver end you will see no packets coming from aacparse. You can replace aacparse with avdec_aac or decodebin and get same result.

Regards
Peter