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webrtc: Fix Python custom signaller receiving SDP offer

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The GstWebRTC API web interface defaults to receiving an SDP offer and
generating an answer, but this can be overridden by entering "offer
options" before clicking to open the remote stream. The Python
webrtcsink-custom-signaller.py example failed in this mode as it was
coded to only generate an offer and receive an answer. Fix this by
implementing support for receiving an offer and sending an answer.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1883>
This commit is contained in:
Chris Bainbridge 2024-10-24 23:29:30 +01:00 committed by GStreamer Marge Bot
parent e30d80c71e
commit 5010ee872d
1 changed files with 10 additions and 3 deletions
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13
net/webrtc/examples/webrtcsink-custom-signaller.py
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@ -104,7 +104,12 @@ class WebRTCClient:
elif msg['type'] == 'sessionStarted':
pass
elif msg['type'] == 'startSession':
self.signaller_emit_session_requested(msg['sessionId'], msg['peerId'], None)
offer = None
if msg['offer']:
_, sdpmsg = GstSdp.SDPMessage.new()
GstSdp.sdp_message_parse_buffer(bytes(msg['offer'].encode()), sdpmsg)
offer = GstWebRTC.WebRTCSessionDescription.new(GstWebRTC.WebRTCSDPType.OFFER, sdpmsg)
self.signaller_emit_session_requested(msg['sessionId'], msg['peerId'], offer)
elif msg['type'] == 'endSession':
self.signaller_emit_session_ended(msg['sessionId'])
elif msg['type'] == 'peer':
@ -147,9 +152,11 @@ class WebRTCClient:
return True
def signaller_on_send_session_description(self, _, session_id, offer):
typ = 'offer'
if offer.type == GstWebRTC.WebRTCSDPType.ANSWER:
typ = 'answer'
sdp = offer.sdp.as_text()
assert offer.type == GstWebRTC.WebRTCSDPType.OFFER
self.send_soon({'type': 'peer', 'sessionId': session_id, 'sdp': { 'type': 'offer', 'sdp': sdp }})
self.send_soon({'type': 'peer', 'sessionId': session_id, 'sdp': { 'type': typ, 'sdp': sdp }})
return True
def signaller_on_send_ice(self, _, session_id, candidate, sdp_m_line_index, sdp_mid):