/// <summary>
/// Add a new media line of the given kind.
///
/// This method creates a media line, which expresses an intent from the user to get a transceiver.
/// The actual <see xref="WebRTC.Transceiver"/> object creation is delayed until a session
/// negotiation is completed.
///
/// Once the media line is created, the user can then assign its <see cref="MediaLine.Source"/> and
/// <see cref="MediaLine.Receiver"/> properties to express their intent to send and/or receive some media
/// through the transceiver that will be associated with that media line once a session is negotiated.
/// This information is used in subsequent negotiations to derive a
/// <see xref="Microsoft.MixedReality.WebRTC.Transceiver.Direction"/> to negotiate. Therefore users
/// should avoid modifying the <see cref="Transceiver.DesiredDirection"/> property manually when using
/// the Unity library, and instead modify the <see cref="MediaLine.Source"/> and
/// <see cref="MediaLine.Receiver"/> properties.
/// </summary>
/// <param name="kind">The kind of media (audio or video) for the transceiver.</param>
/// <returns>A newly created media line, which will be associated with a transceiver once the next session
/// is negotiated.</returns>
public MediaLine AddMediaLine(MediaKind kind)
{
var ml = new MediaLine(kind);
_mediaLines.Add(ml);
return(ml);
}
/// <summary>
/// Log an error when receiving an exception related to a media line and transceiver pairing.
/// </summary>
/// <param name="ex">The exception to log.</param>
/// <param name="mediaLine">The media line associated with the exception.</param>
/// <param name="transceiver">The transceiver associated with the exception.</param>
private void LogErrorOnMediaLineException(Exception ex, MediaLine mediaLine, Transceiver transceiver)
{
// Dispatch to main thread to access Unity objects to get their names
InvokeOnAppThread(() =>
{
string msg;
if (ex is InvalidTransceiverMediaKindException)
{
msg = $"Peer connection \"{name}\" received {transceiver.MediaKind} transceiver #{transceiver.MlineIndex} \"{transceiver.Name}\", but local peer expected some {mediaLine.MediaKind} transceiver instead.";
if (mediaLine.Source != null)
{
msg += $" Sender \"{(mediaLine.Source as MonoBehaviour).name}\" will be ignored.";
}
if (mediaLine.Receiver != null)
{
msg += $" Receiver \"{(mediaLine.Receiver as MonoBehaviour).name}\" will be ignored.";
}
}
else
{
// Generic exception, log its message
msg = ex.Message;
}
Debug.LogError(msg);
});
}
private void Peer_VideoTrackRemoved(Transceiver transceiver, RemoteVideoTrack track)
{
Debug.Assert(track.Transceiver == null); // already removed
// Note: if the transceiver was created by SetRemoteDescription() internally, but the user
// did not add any MediaLine in the component, then the transceiver is ignored.
// SetRemoteDescriptionAsync() already triggered a warning in this case, so be silent here.
MediaLine mediaLine = _mediaLines.Find((MediaLine ml) => ml.Transceiver == transceiver);
if (mediaLine != null)
{
Debug.Assert(mediaLine != null);
Debug.Assert(mediaLine.MediaKind == MediaKind.Video);
mediaLine.OnUnpaired(track);
}
}
void IMediaTrackSourceInternal.OnRemoveFromMediaLine(MediaLine mediaLine)
{
bool removed = _mediaLines.Remove(mediaLine);
Debug.Assert(removed);
}
void IMediaTrackSourceInternal.OnAddedToMediaLine(MediaLine mediaLine)
{
Debug.Assert(!_mediaLines.Contains(mediaLine));
_mediaLines.Add(mediaLine);
}
/// <inheritdoc/>
void IMediaReceiverInternal.OnRemoveFromMediaLine(MediaLine mediaLine)
{
bool removed = _mediaLines.Remove(mediaLine);
Debug.Assert(removed);
}
/// <inheritdoc/>
void IMediaReceiverInternal.OnAddedToMediaLine(MediaLine mediaLine)
{
Debug.Assert(!_mediaLines.Contains(mediaLine));
_mediaLines.Add(mediaLine);
}
/// <summary>
/// Internal callback invoked when the media receiver is de-assigned from a media line.
/// </summary>
/// <param name="mediaLine">The old media line this receiver was assigned to.</param>
protected internal virtual void OnRemovedFromMediaLine(MediaLine mediaLine)
{
Debug.Assert(MediaLine == mediaLine);
MediaLine = null;
}
/// <summary>
/// Internal callback invoked when the media receiver is assigned to a media line.
/// </summary>
/// <param name="mediaLine">The new media line this receiver is assigned to.</param>
protected internal virtual void OnAddedToMediaLine(MediaLine mediaLine)
{
Debug.Assert(MediaLine == null);
MediaLine = mediaLine;
}
internal void OnRemovedFromMediaLine(MediaLine mediaLine)
{
bool removed = _mediaLines.Remove(mediaLine);
Debug.Assert(removed);
}
internal void OnAddedToMediaLine(MediaLine mediaLine)
{
Debug.Assert(!_mediaLines.Contains(mediaLine));
_mediaLines.Add(mediaLine);
}