How can I disable the congestion control algorithm ?

[ftv dev]

I am doing some QoS tests and I would like to disable rate adaptation for congestion control mechanism within webrtc. Is that possible ?

[Justin Uberti]

This is not supported at this time, as disabling this would allow applications to send arbitrary amounts of data onto the network.

We might add a flag or webrtc-internals option in the future to allow doing this in test environments.

[ftv dev]

Thank you for your response. Do you have any idea about the difficulty and the needed time to disable it from the source code ?

[grgk...@gmail.com]

I was able to comment out all instances of  send_limiter_ from RtpDataMediaChannel class implementation.

talk_base::scoped_ptr<talk_base::RateLimiter> send_limiter_

This helped me overcome some of the issues I was facing in terms of bandwidth availability for data channel on the send side. 

Do you have any other rate control algorithms in mind ?

Thanks.

George

[ftv dev]

Yes, I have another rate algorithms in my mind. However, it is just an idea and I need more time to test it and see the results. For me, I tried to disable it by modifying the source code of several parts :  bitrate_controller, remote_bitrate_estimator,...
Then I discovered an easier method. I just disable nack and the receiver estimate maximum bit rate  (by deleting a=rtcp-fb:100 nack and a=rtcp-fb:100 goog-remb) and I fix the bandwidth using SDP by adding this line :b=AS:1024.

[ftv dev]

Apparently, a newer version of chrome. The SPD parameter b=AS:* doesn't fix the bandwidth but the value defined in this paramters will be set as the maximum bitrate (Which is the normal behaviour as defined in the SDP).

So here I am looking again for a way to disable the congestion control. It tried to comment instances of RateLimiter but I remarked that this only delete the upper bound. By that I mean that if the network parameter are degraded the congestion control algorithm will decrease the encoder bitrate.

So is there a better way ? where can I find the methods responsible about change the encoder bitrate ?

[Miniruwan]

Did anyone managed to do this?