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webrtcbin: reverse direction from remote media

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This had been overlooked from the spec. We need to reverse
the remote media direction when setting the transceiver direction.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7294>
This commit is contained in:
Carlos Bentzen 2024-08-02 11:19:56 +02:00
parent f3d14d33a8
commit cad3e63546
1 changed files with 26 additions and 3 deletions
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29
subprojects/gst-plugins-bad/ext/webrtc/gstwebrtcbin.c
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@ -6280,6 +6280,22 @@ get_last_generated_description (GstWebRTCBin * webrtc, SDPSource source,
return NULL;
}
static GstWebRTCRTPTransceiverDirection
_reverse_direction (GstWebRTCRTPTransceiverDirection direction)
{
switch (direction) {
case GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE:
case GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE:
case GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV:
return direction;
case GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY:
return GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY;
case GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY:
return GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY;
}
return GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE;
}
/* https://w3c.github.io/webrtc-pc/#set-description (steps in 4.6.10.) */
static gboolean
_create_and_associate_transceivers_from_sdp (GstWebRTCBin * webrtc,
@ -6328,12 +6344,14 @@ _create_and_associate_transceivers_from_sdp (GstWebRTCBin * webrtc,
const gchar *mid;
guint transport_idx;
TransportStream *stream;
GstWebRTCRTPTransceiverDirection direction;
if (_message_media_is_datachannel (sd->sdp->sdp, i))
continue;
media = gst_sdp_message_get_media (sd->sdp->sdp, i);
mid = gst_sdp_media_get_attribute_val (media, "mid");
direction = _get_direction_from_media (media);
/* XXX: not strictly required but a lot of functionality requires a mid */
if (!mid) {
@ -6390,8 +6408,6 @@ _create_and_associate_transceivers_from_sdp (GstWebRTCBin * webrtc,
* that were added to the PeerConnection by addTrack and are not associated with any "m=" section
* and are not stopped, find the first (according to the canonical order described in Section 5.2.1)
* such RtpTransceiver. */
GstWebRTCRTPTransceiverDirection direction =
_get_direction_from_media (media);
if (direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV
|| direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY) {
int j;
@ -6464,11 +6480,18 @@ _create_and_associate_transceivers_from_sdp (GstWebRTCBin * webrtc,
trans->mid = g_strdup (mid);
g_object_notify (G_OBJECT (trans), "mid");
/* Let direction be an RTCRtpTransceiverDirection value representing the direction from the media
description, but with the send and receive directions reversed to represent this peer's point of view. */
direction = _reverse_direction (direction);
/* If the media description is rejected, set direction to "inactive". */
if (gst_sdp_media_get_port (media) == 0)
direction = GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE;
/* If description is of type "answer" or "pranswer", then run the following steps: */
if (sd->sdp->type == GST_WEBRTC_SDP_TYPE_ANSWER
|| sd->sdp->type == GST_WEBRTC_SDP_TYPE_PRANSWER) {
/* Set transceiver.[[CurrentDirection]] to direction. */
trans->current_direction = _get_direction_from_media (media);
trans->current_direction = direction;
}
/* Let transport be the RTCDtlsTransport object representing the RTP/RTCP component of the media transport
* used by transceiver's associated media description, according to [RFC8843]. */