Best workaround for 24 Bit playback on Cubietruck

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Best workaround for 24 Bit playback on Cubietruck

Postby floyd » 06 Feb 2016, 06:54

Hi Guys,

whats the best work around, do you think, for being able to play all my 24bit files that are in my library through cubietrucks optical out?

I can play them via the 3.5mm output and the quality sounds better than I was expecting, but I do prefer the DAC in my Sony amp.

Is there a downsampling option in Rune?
floyd
 
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Re: Best workaround for 24 Bit playback on Cubietruck

Postby hondagx35 » 06 Feb 2016, 11:05

Hi floyd,

what is your problem with 24bit files?

Cubietruck should be able to play up to 24 bits/192 KHz through SPDIF.

It would be great to have more debug information.
Please post the output from:
Code: Select all
cat /proc/asound/card1/pcm0p/sub0/hw_params

while playing some highres files.

Frank
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hondagx35
 
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Re: Best workaround for 24 Bit playback on Cubietruck

Postby floyd » 06 Feb 2016, 22:45

Gday Frank,

Thanks for the reply mate.

Sorry, Ive made a boo-boo....

This amp/receiver (Sony STR-DB940) is new to me, as my (not-so) trusty Onkyo decided to stop outputting audio.

Anyways, Ive just done some more reading and the issue is my amp, not the cubietruck (although I am surprised to learn that is has no drama outputting 24/192 via spdif, as most sources say it is limited due to hardware, although technically possible)

Turns out my amps DAC can not handle 192 sample rates. Maxes out at 96. But 24 bit is no problem....so Ill have to downsample my 192 files. Bummer. But at least I can play all my other 24 bitters.
floyd
 
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Joined: 31 May 2015, 06:54

Re: Best workaround for 24 Bit playback on Cubietruck

Postby rune11 » 15 Dec 2017, 19:22

Hi All,

I have just installed RuneAudio on my CubieTruck.
I tried to play 24bit/96kHZ over SPDIF, which fails:

Code: Select all
aplay  -D hw:1,0 LessLoss-Drums_duet_5-16_bit-44.1_kHz-LL.wav
Playing WAVE 'LessLoss-Drums_duet_5-16_bit-44.1_kHz-LL.wav' : Signed 16 bit Little Endian, Rate 44100 Hz,

Stereo

[root@runeaudio ~]# cat /proc/asound/card1/pcm0p/sub0/hw_params
access: RW_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 5513
buffer_size: 22052


Now 24bit/96kHz:

Code: Select all
[root@runeaudio LessLoss]# aplay  -D hw:1,0 LessLoss-Drums_duet_5-24_bit-96_kHz-LL.wav
Playing WAVE 'LessLoss-Drums_duet_5-24_bit-96_kHz-LL.wav' : Signed 24 bit Little Endian in 3bytes, Rate

96000 Hz, Stereo
aplay: set_params:1233: Sample format non available
Available formats:
- S16_LE



When I play this 24bit/96kHz file via RuneAudio GUI I also get hw_params=S16_LE

It looks like, I face issue described under:
http://www.cubieforums.com/index.php?topic=1081.0

At page 6 we have : >>>>Reply #77 on: April 16, 2015, 11:23:37 pm
which refers to their SPDIF driver for 24bit support over SPDIF,
but this RuneAudio image comes from "v0.3-beta (14/04/2015)".
I have executed update as described under manual pages. It does not help.

Could you please double check hw_params at your side
when you play 24bit/96kHz files ?

Thanks, Chris.
rune11
 
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