Investigate opus build optimizations for ARM non-FP (Raspberry, Android, iOS)

[hoffie]

What is the current behaviour and why should it be changed?

There are hints that it might make sense to set specific opus build flags to improve performance on low-spec arm builds (Raspberry, Android, iPhone):

• openwebrtc issue
• https://github.com/jamulussoftware/jamulus/blob/master/distributions/raspijamulus.sh#L53

Describe possible approaches

• Find out if it's worth it (run benchmarks, do research, e.g. https://raspberrypi.stackexchange.com/questions/545/does-the-raspberry-pi-have-hardware-floating-point-support/546#546)
• Find out how to make qmake enable those flags (maybe some defines?): -D FIXED_POINT
• Implement
• Consider dropping manual opus installation in raspijamulus.sh?

Has this feature been discussed and generally agreed?

No.

[hoffie]

Looks like a -D FIXED_POINT might suffice based on opus' configure.ac. We could add that define in Jamulus.pro when building for armhf.

@ann0see We should probably investigate whether this might make sense for Android/iPhone as well. Might want an extra issue.

[ann0see]

@hoffie do you think this should go into 3.9.0 or rather in the next release?

[pljones]

Moved to 3.9.1

[pljones]

Moving to 3.10.0 as it's notabug.

[pljones]

Nothing happening on the Android front. Moving to Triage and dropping the milestone.