On 23/01/2020 19:38, Ben Dooks wrote:
On 07/01/2020 01:39, Dmitry Osipenko wrote:
06.01.2020 22:00, Ben Dooks пишет:
On 05/01/2020 10:53, Ben Dooks wrote:
On 2020-01-05 01:48, Dmitry Osipenko wrote:
05.01.2020 03:04, Ben Dooks пишет:
[snip]
I've just gone through testing.
Some simple data tests show 16 and 32-bits work.
The 24 bit case seems to be weird, it looks like the 24-bit expects
24 bit samples in 32 bit words. I can't see any packing options to
do 24 bit in 24 bit, so we may have to remove 24 bit sample support
(which is a shame)
My preference is to remove the 24-bit support and keep the 32 bit in.
Interesting.. Jon, could you please confirm that 24bit format isn't
usable on T30?
If there is an option of 24 packed into 32, then I think that would
work.
I can try testing that with raw data on Monday.
I need to check some things, I assumed 24 was 24 packed bits, it looks
like the default is 24 in 32 bits so we may be ok. However I need to
re-write my test case which assumed it was 24bits in 3 bytes (S24_3LE).
I'll follow up later,
Okay, the S24_3LE isn't supported by RT5640 codec in my case. I briefly
looked through the TRM doc and got impression that AHUB could re-pack
data stream into something that codec supports, but maybe it's a wrong
impression.
_________________________________
I did a quick test with the following:
sox -n -b 16 -c 2 -r 44100 /tmp/tmp.wav synth sine 500 vol 0.5
sox -n -b 24 -c 2 -r 44100 /tmp/tmp.wav synth sine 500 vol 0.5
sox -n -b 32 -c 2 -r 44100 /tmp/tmp.wav synth sine 500 vol 0.5
The 16 and 32 work fine, the 24 is showing a playback output freq
of 440Hz instead of 500Hz... this suggests the clock is off, or there
is something else weird going on...
I should have checked pll_a_out0 rate, for 24bit 2ch, I get
pll_a_out at which makes:
11289600/(24*2*44100) = 5.3333333333
For some reason the PLL can't get a decent divisor for this.
--
Ben Dooks http://www.codethink.co.uk/
Senior Engineer Codethink - Providing Genius
https://www.codethink.co.uk/privacy.html
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