USB DAC support on USB OTG enabled devices

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Re: USB DAC support on USB OTG enabled devices

Postby Nicholas Ku » Tue Jun 14, 2016 10:45 pm

Samsung Galaxy Note 4 (Android 6.0.1) pairing with Xduoo XD-05 DAC/Amp.
No problems with this setup when using Generic driver (DAC frequensy is always 192kHz).But it has clicks even on 16/44.1 files, while choosing Direct USB Driver. Hi-res and especially DSD files is playing with glitches and lot of clicks. There is a not hardware problem, cause "USB Audio Player" plays flawlessly same FLACs ans DSFs
Nicholas Ku
 
Posts: 2
Joined: Tue Jun 14, 2016 10:04 pm

Re: USB DAC support on USB OTG enabled devices

Postby ZERO » Fri Aug 05, 2016 11:21 am

Oppo wrote:Below please find some more information on which HW/SW configurations glitches/clicks appear too. Please tell if you will need more info.

For me this issue happens on multiple phones/Neutron settings, and details below describe settings where issue DOES occur, unless stated otherwise. I tried different settings, which in my opinion could eliminate glitching, but did not succeed. Below I provide only the settings, which are applicable IMO.

==================================

1. Phone: HTC 1 M8
Neutron versions: 1.87.1, 1.88.1
64-Bit Processing: on/off
VEC: NEON
DRV: OpenSl ES
Direct USB driver: on
32-bit Output: on/off
Frequency: 48000
Hardware latency: 2-192

**********************************
2. Phone: Alcatel 8008D: issue never occurs
Neutron versions: 1.87.1, 1.88.1
64-Bit Processing: on/off
VEC: NEON
DRV: OpenSl ES
Direct USB driver: on
32-bit Output: on/off
Frequency: 44100
Hardware latency: 2-192
**********************************

In below two configurations audio data is sent via USB to external DAC "Oppo HA-2", and this is where
severe glitching/clicking occurs.

3. Phone: HTC 1 M8
Neutron versions: 1.87.1, 1.88.1
64-Bit Processing: on/off
VEC: NEON
DRV: Oppo
Direct USB driver: on
32-bit Output: on/off
Frequency: 44100-352800
Hardware latency:
0-30: extreme glitching
300-400: less glitching

4. Phone: Alcatel 8008D
Neutron versions: 1.87.1, 1.88.1
64-Bit Processing: on/off
VEC: NEON
DRV: Oppo
Direct USB driver: on
32-bit Output: on/off
Frequency: 44100-352800
Hardware latency:
0-30: extreme glitching
300-398: less glitching

Audio source: MP3, FLAC, WAV, WV, with whole bunch of different frequencies, 16-bit; it seems that on some MP3s glitching/clicking is much worse, than on FLACs, surprisingly.

================================

It seems, that on HTC 1 with external DAC plugged in glitching disappears after long continuing listening. (I cannot tell exactly after which period of time, and I'm not sure here), but once another song is selected or forwarded to - glitching always reappears.

NOTE: the same issue with glitching occur in Onkyo HF player, when data is sent through USB to external DAC, hence I believe the problem exists not only in Neutron player.


Is this still an issue? I am considering getting an OPPO HA-2 for my Moto X Pure and want to make sure it is actually going to work before I buy it.
ZERO
 
Posts: 3
Joined: Thu Dec 10, 2015 12:43 pm

Re: USB DAC support on USB OTG enabled devices

Postby rabits » Wed Nov 02, 2016 1:29 am

This has been a fascinating string, and obviously USB DAC bolster gets my vote. I utilize both a Motorola XOOM tablet and a Motorola RAZR MAXX HD telephone.
I might want to see USB bolster as there are more models accessible, and permit cost issues don't exist.
rabits
 
Posts: 1
Joined: Wed Nov 02, 2016 1:16 am

Re: USB DAC support on USB OTG enabled devices

Postby Alexeyporubay » Thu Nov 16, 2017 3:54 pm

Hello to all members of the forum!
Information only for those who use android development, I prepared a useful list of frameworks for work: https://www.cleveroad.com/blog/android- ... works-have
Alexeyporubay
 
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Joined: Thu Nov 16, 2017 3:44 pm
Location: Kharkiv

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