Automatically adjust video bitrate/resolution when network quality degrades

[Chuongv]

When network quality goes bad, objcTox should be either lower the resolution or ask toxav to lower the video bitrate.

[Chuongv]

With the new toxAV, we receive a call back that actually suggests the bitrate we should move to. However the call back will never suggest a higher bit rate. So we will need to set a timer that will set the bit rate higher after it has been lowered. If we move it to high, toxAV will suggest a more appropriate bit rate.

So for example, we start a call with 48kb/s bit rate audio.
ToxAV callback with 24kb/s for audio.
ObjcTox sets bitrate to 24kb/s for audio.
ObjcTox sets timer to attempt to move bitrate back to 48 after 3 minutes.
3 minutes pass.. ObjcTox sets bitrate to 48.
ToxAV callback with 36 kb/s.
ObjcTox sets bitrate to 36 kb/s

[DanTheBritish]

3 minutes is a long time, could it not be 1 minute (or even 30 seconds)?

[dvor]

@Chuongv what will happen when we'll set bit rate to too high value? Would toxav immediately lower it? In this case we can try to increase it really often (like 10 seconds maybe?).

[Chuongv]

According to mannol, if we set it too high, it will suggest a new bit rate after 2 seconds. So yea we could make it increase often every 10 seconds.

[Chuongv]

Depends on irungentoo/toxcore#1469