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ErosQ - Stereo channels swapping around

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Oktan:

--- Quote from: dconrad on March 18, 2023, 01:05:53 PM ---Also tried it on m3k, and couldn't seem to reproduce it there. So whatever it is, it's unique to the eros q.

--- End quote ---
I should also state that I'm using the native port, and that I have an Eros Q that is actually an Eros, and it has a microUSB port.

dconrad:
Good to know that it's not dependent on the particular hardware revision, because I'm using the newer revision with USB C.

I think I might have stumbled across it being related to the sample frequency - I've got a couple tests if you wouldn't mind seeing if you can still reproduce the issue in a couple circumstances.

Maybe find a pair of files where you can go back and forth and sometimes the channels swap sides, and a pair of files where it doesn't seem to ever occur? (if I'm on to something, I believe you should be able to find a set of such files).

  - What are the frequencies of all 4 relevant files (^^) under Track Info?
  - Under Playback Settings, what do you have Frequency set to?
  - Try repeatedly changing the frequency setting while playing back the test file. Any effect?
  - Try setting the frequency setting to something other than Automatic (anything 96khz and under - I was able to reproduce this with this setting set to 176.4khz and 192khz, but have been unsuccessful with the lower values). Can you still reproduce the issue?

dconrad:
So depending on how much you value higher sample rates, I did make a build which only supports 44.1k. If you want to give it a spin and see if you can get the issue to occur at all, feel free: https://www.dropbox.com/s/w640z6o1sfcg17x/rockbox-erosqnative-44.1k-c0a99b88e4d-03-18-2023.zip?dl=0

dconrad:
Another day, another build - after floundering around a while, I managed to, I think, find the culprit. Give this build a try and see if you can get the issue to occur, because I can't seem to, so this may fix it: https://www.dropbox.com/s/vkerk3zqm100zv4/rockbox-erosqnative-swapfix-e97155c44-03-19-2023.zip?dl=0

It corresponds to this patchset: https://gerrit.rockbox.org/r/c/rockbox/+/5166

KarlLeach:
I will try it :)

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