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16 commits

Author SHA1 Message Date
Juliusz Chroboczek
3d2089f40f Merge GetRTP and Nack into GetPacket.
The two function were always called together.  This factors out
the NACKing logic into the track.
2021-07-14 14:22:22 +02:00
Juliusz Chroboczek
36d31f0db8 Maintain a reference to the connection associated to each track.
This avoids carrying an extra parameter in many places.
2021-07-14 14:05:23 +02:00
Juliusz Chroboczek
22585e9d10 Handle spatial scalability.
Maintain spatial layer information, and drop lower layers when
possible.  Yields a 20% saving with VP9.
2021-05-17 18:17:43 +02:00
Juliusz Chroboczek
6f9d7fc306 Scalable video coding (SVC). 2021-05-14 23:21:14 +02:00
Juliusz Chroboczek
c53cc20d26 Use Write instead of WriteRTP in the downTrack interface. 2021-05-11 23:48:17 +02:00
Juliusz Chroboczek
d3f53e6ada Move rate estimation into rtpDownTrack.WriteRTP. 2021-05-11 22:45:33 +02:00
Juliusz Chroboczek
c52e1f4ce0 Move keyframe handling to the sender side.
This is simpler and gets rid of ErrKeyframeNeeded.
2021-05-11 22:36:56 +02:00
Juliusz Chroboczek
795a40ceaf Simulcast. 2021-05-08 21:12:29 +02:00
Juliusz Chroboczek
be73380f9f Label streams, not tracks.
We used to label tracks individually, in a view to using the labelling
for simulcast.  Since then, the WebRTC community has converged on a
different strategy, where multiple tracks share a single mid and
are labelled with the rid extension.

We now label whole streams, which is simpler, and use the track's
kind (and, in the future, the rid) to disambiguate.  This changes the
protocol in two ways:

  * in offers, the "labels" dictionary is replaced by a single "label"
    field; and
  * the syntax of the "request" message has changed.
2021-04-29 18:28:16 +02:00
Juliusz Chroboczek
263258a0c1 Implement renegotiation of down streams.
We used to destroy and recreate down streams whenever something changed,
which turned out to be racy.  We now properly implement renegotiation,
as well as atomic replacement of a stream by another one.
2021-02-03 19:15:40 +01:00
Juliusz Chroboczek
f53276b89e Simplify the protocol and the protocol interface.
Split the id field into id and source, where source indicates the sender
of the message and id the entity being sent.  Remove the label request,
just use the offerer's username.  Maintain the username within the
ServerConnection, this removes a parameter from some methods.
2021-01-03 12:17:30 +01:00
Juliusz Chroboczek
5d38b0a231 Allow various codecs.
It is now possible to specify codecs other than VP8 and Opus.  This
turns out not to be very useful, since VP8 is the only codec supported
by all browsers (in violation of the WebRTC spec, which mandates support
for H.264), and there is no good reason to use anything other than Opus
for audio.
2020-12-26 19:46:37 +01:00
Juliusz Chroboczek
66fb73d01e Relicense under the MIT licence. 2020-12-19 17:26:33 +01:00
Juliusz Chroboczek
2d07c5d317 Move to Pion v3 API. 2020-12-06 11:15:59 +01:00
Juliusz Chroboczek
5e130122f5 Forward NACKs to sender in case of double loss.
We already send NACKs when a packet is missing.  Under high packet loss,
however, the recovery packet might get lost two.  Forward receiver NACKs
to the sender, but only after a delay and after checking that the packet
has not arrived in the meantime.
2020-10-12 13:00:59 +02:00
Juliusz Chroboczek
d9cf32eda7 Move connections to their own package. 2020-09-13 20:40:33 +02:00