Rockbox Development > Feature Ideas

Is it possible to disable downsampling?

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andrew_a:
Hello guys,

another thing I decided to do - add a MAX 9722 OPA to improve the headphone output.

Still wondering if you could help me to raise sample rates?

Thanks!

saratoga:
Looking at that DAC, I think it detects the oversampling ratio automatically from the clock you provide it and the I2S signal.  So I guess get the I2S signal working at 44.1khz with 512x oversampling.  Then build with test_plugins enabled, load test_sampr, and set the sample rate to 88.2KHz.  If everything is working, you should hear the test tone at the right frequency played back at 256x oversampling instead of 512.  You should be able to get this far hopefully without changing anything in the code. 

cataclem:
hello!

sorry if i ask a question?
i have an ipod video(classic, 5.5) which i rockboxed and i tested it with 24/96 files which it reads very well (actually this files sound better even downsampled then 16/44, same tune); 24/192 have gaps in playing (i need probably to maximize the buffer?)
but my question is if you really can play files at default quality...

thank you!

saratoga:
Your CPU might not be fast enough to decode them.  If they are 5.1, make sure you downsample to stereo first.

It'd be more efficient to downsample to 44.1k/48k first though, since that is what rockbox is resampling to. 

cataclem:
i don't use 5.1 files, just stereo wav or flac.
i'm not a developer, so i don't know how to modify rockbox source.
my ask was about it is possible to disable downsample or to make an audiophile edition without downsample...

thank you!

anyway, rockbox is an incredible ipod firmware :)

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