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Old 9th July 2014, 04:14 AM   #31
twluke is offline twluke  Japan
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Quote:
Originally Posted by miero View Post
It seems that native support for DSD playback has been added just while before my release :-)
Oh well... ....
Anyway this is good information, thank you so much.
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Old 9th July 2014, 10:03 AM   #32
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Quote:
Originally Posted by miero View Post
> This went well and I couldn't find any difference between your DSD-native MPD and this DoP-only MPD in playing files. That is one of the reasons to raise a question about the patch.

https://github.com/lintweaker/mpd-ds...commits/master

It seems that native support for DSD playback has been added just while before my release :-)
Native DSD playback support is not finished yet. I have a BBB on order to be able to test.
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Old 9th July 2014, 10:17 AM   #33
miero is offline miero  Czech Republic
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lintweaker: OK, thanks :-) For now you'll need to compile it on BBB, there is patched ALSA with more support for DSD. I'll try to send related patches to upstream soon, but I'd like to test them before (e.g. DSD silence pattern).
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Old 9th July 2014, 02:52 PM   #34
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Quote:
Originally Posted by miero View Post
Questionable:
- MPD playback quality ... better to use command line tool play
Hi miero,
I see that you are using a "helper" audio playback application, instead of MPD's internal playback engine.
So you might be interested to investigate BruteFIR which a few years ago was alleged to be the best "audiophile" commandline audio player application -
BruteFIR
Setup is a bit messy; it requires a default configuration file; /root/.brutefir_config
as explained here -
BruteFIR
which includes the name and location of the audio file to be played, in this format -
device: "file" { path: "/mnt/sdb1/MUSIC/mymusic.wav"; };
Once configured, all that's required is to run the command "brutefir".
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Old 9th July 2014, 03:11 PM   #35
miero is offline miero  Czech Republic
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This might be caused by different issue - the size of HW buffers in the BBB audio interface which seems to be much more smaller (just a few samples) than most of common audio card (PCI and USB).

In the mpd.conf on demo image I've set "period_time" of ALSA output to the smallest value, but there might be more things to be tuned.

There was no problem with command line tools play and aplay, which are using default ALSA values. So I assume the MPD can be fixed too.

BruteFIR is not relevant in that case :-)
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Old 9th July 2014, 03:30 PM   #36
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Sorry, maybe I wasn't clear. I wasn't concerned so much with fixing playback problems, but rather with improving SQ.
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Old 9th July 2014, 08:05 PM   #37
miero is offline miero  Czech Republic
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BruteFIR is good if you need to apply some filter, but for regular playback it should work just as any other command line tool (play or aplay).
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Old 10th July 2014, 12:28 AM   #38
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In theory, yes, others claim not so in practice.
I was just checking whether you might be interested in such investigation. Apparently not, and that's fine.
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Old 10th July 2014, 09:41 AM   #39
twluke is offline twluke  Japan
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Out of curiosity, I retrieved the source file from the URL above and compiled it under the boticized 3.15.1 kernel running on BBB.

After installation, I compared the binary with the one by miero, playing several DSD128 sources and found that the sound quality was quite close each other, permitting only slightly better resolution with the lintweaker version.

Just my two cents.
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Old 10th July 2014, 08:43 PM   #40
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Join Date: Jul 2014
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Default unable to download driver

jsr@ettu:/media/backups/bone$ wget http://bbb.ieero.com/botic_driver_v3.tar.gz
--2014-07-10 16:25:11-- http://bbb.ieero.com/botic_driver_v3.tar.gz
Resolving bbb.ieero.com (bbb.ieero.com)... 74.220.219.62
Connecting to bbb.ieero.com (bbb.ieero.com)|74.220.219.62|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2014-07-10 16:25:11 ERROR 404: Not Found.
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