Aiortc

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DTLS
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* Log OpenSSL errors if the DTLS handshake fails.
* Fix DTLS handshake in server mode with OpenSSL < 1.1.0.

Media
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* Add :meth:`RTCRtpReceiver.getCapabilities` and :meth:`RTCRtpSender.getCapabilities`.
* Add :meth:`RTCRtpReceiver.getSynchronizationSources`.
* Add :meth:`RTCRtpTransceiver.setCodecPreferences`.

Examples
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* `server` : make it possible to force audio codec.
* `server` : shutdown cleanly on Chrome which lacks :meth:`RTCRtpTransceiver.stop`.

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Data channels
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* Emit a warning if the crcmod C extension is not present.

Media
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* Support subsequent offer / answer exchanges.
* Route RTCP parameters to RTP receiver and sender independently.
* Fix a regression when the remote SSRC are not known.
* Fix VP8 descriptor parsing errors detected by fuzzing.
* Fix H264 descriptor parsing errors detected by fuzzing.

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Media
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* Add support for RTX retransmission packets.
* Fix RTP and RTCP parsing errors detected by fuzzing.
* Use case-insensitive comparison for hash algorithm in SDP, fixes interoperability with Asterisk.
* Offer NACK PLI and REMB feedback mechanisms for H.264.

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Data channels
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* Raise an exception if :meth:`RTCDataChannel.send` is called when readyState is not `'open'`.
* Do not use stream sequence number for unordered data channels.

Media
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* Set VP8 target bitrate according to Receiver Estimated Maximum Bandwidth.

Examples
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* Correctly handle encoding in copy-and-paste signaling.
* `server` : add command line options to use HTTPS.
* `webcam` : add command line options to use HTTPS.
* `webcam` : add code to open webcam on OS X.

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* Rework code in order to facilitate garbage collection and avoid memory leaks.

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Media
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* Make AudioStreamTrack and VideoStreamTrack produce empty frames more regularly.

Examples
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* Fix a regession in copy-and-paste signaling which blocked the event loop.