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Old 23rd December 2009, 01:06 AM   #1441
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Quote:
Originally Posted by soundcheck View Post
Did I tell you guys that I am running a Squeezzebox (SBR -"without controller" @ 110) now?...
Do you know of any hacks that can get the Squeezebox receiver to up-sample the 16 bit data stream from the server to 24 bits and then output it on its optical or spdif connectors?
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Old 23rd December 2009, 01:08 AM   #1442
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What would that be good for?
Why, if you wish to use upsampling, not leave it to the D/A converter?
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Old 23rd December 2009, 05:07 AM   #1443
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Quote:
Originally Posted by boconnor View Post
Do you know of any hacks that can get the Squeezebox receiver to up-sample the 16 bit data stream from the server to 24 bits and then output it on its optical or spdif connectors?
As it seems 16bit are padded to 24bit on the SBR.
I've been told that the SBR (FPGA) works internally 24bit and also outputs
24bit.
Volume control is done in 24bit.

24bit thread at SB Forum
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Old 23rd December 2009, 06:06 AM   #1444
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Quote:
Originally Posted by soundcheck View Post
As it seems 16bit are padded to 24bit on the SBR.
I've been told that the SBR (FPGA) works internally 24bit and also outputs
24bit.
Volume control is done in 24bit.

24bit thread at SB Forum
Thanks for the info - useful.

Do you know any way to force the sample rate on the SBR's digital output to be 48kHz?
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Old 23rd December 2009, 07:21 AM   #1445
jleaman is offline jleaman  Belgium
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So how many people are using Ubuntu ? What are people using for their audio player ? I used to run xmms, but can't get it working on a older system.

Currently running ubuntu 9.10 on a 24" monitor with a P4 1.7 @ 1.5gigs ram on a 80gig :P runs ok for now.

J'
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Old 23rd December 2009, 07:35 AM   #1446
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Quote:
Originally Posted by boconnor View Post
Thanks for the info - useful.

Do you know any way to force the sample rate on the SBR's digital output to be 48kHz?
Yes. You need to do the resampling on the server by by changing the rules for wav or whatever format you're using in /etc/squeezeboxserver/
convert.conf respectively /etc/squeezeboxserver/custom-convert.conf.

Check this one out:

SB resampling

Seems that I am just three days ahead of you.
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Old 23rd December 2009, 08:26 AM   #1447
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Quote:
Originally Posted by jleaman View Post
So how many people are using Ubuntu ? What are people using for their audio player ? I used to run xmms, but can't get it working on a older system.

Currently running ubuntu 9.10 on a 24" monitor with a P4 1.7 @ 1.5gigs ram on a 80gig :P runs ok for now.

J'
Linux Mint + Audacious 2 would be my first choice. ( for people who are new to Linux)
Music Player Daemon if you're a bit more advanced. You need to be able to do some configs on the commandline. It is a great application for network audio streaming. Remote control via iPhone app and Firefox is possible.

I recently figured that VLC is doing a pretty good job in the audio world too.
It is an interesting player which comes with interesting tweaking options and tons of plugins. It is available on all OSes .
Beside that I am using it for video playback of course. ( Probably the best video player) The HTML interface is pretty basic - I wouldn't use it at this stage.

With the Squeezebox all above become obsolete. Non one of them is as comortable to use as my iPeng/SqueezboxCenter combination.
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Old 23rd December 2009, 09:02 AM   #1448
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Quote:
Originally Posted by soundcheck View Post
Yes. You need to do the resampling on the server by by changing the rules for wav or whatever format you're using in /etc/squeezeboxserver/
convert.conf respectively /etc/squeezeboxserver/custom-convert.conf.

Check this one out:

SB resampling

Seems that I am just three days ahead of you.
Excellent - you are a treasure of info! Cheers
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Old 7th January 2010, 03:52 PM   #1449
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Hi folks.

How does this look like?

Code:
E-MU Systems, Inc. E-MU 0404 | USB at usb-0000:00:06.1-1.4.4, high speed : USB Audio

Playback:
  Status: Running
    Interface = 1
    Altset = 10
    URBs = 6 [ 8 8 8 8 8 8 ]
    Packet Size = 586
    Momentary freq = 192000 Hz (0x18.0000)
   Interface 1
    Altset 10
    Format: S24_3LE
    Channels: 2
    Endpoint: 1 OUT (ASYNC)
    Rates: 192000
    Data packet interval: 500 us
To me it looks like 192khz in async USB mode. They finally managed.

It even works on the hw output now - before only plughw was possible.

If you own a EMU 0404USB run my Alsa Upgrade script >1.22.1-2 and install the driver snapshot on top. (Follow link in signature)


BTW: I tested the earlier discussed repo upgrade of Alsa. I'll stick with the manual upgrade using my script.


Cheers
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Old 7th January 2010, 04:30 PM   #1450
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BTW. If you don't have a 24/192 file at hand, below commands might help to create one easily:


Code:
SOX 14.3.0 ( parameters might differ from other revisions) 
sox -D -t wav -e signed-integer -b 24 -r 96000 your96k-file.wav  -t wavpcm -e signed-integer -b 24 your192k-file.wav rate -v -I -s 192000

Playback:

RT-KERNEL:      schedtool -F -p 75 -e ecasound -B:rt -b:32 -r:80 -f:s24_le,2,192000,i -i:your192k-file.wav -o:alsahw,1,0 
NORMAL-KERNEL:  ecasound -B:rt -b:32 -r:80 -f:s24_le,2,192000,i -i:your192k-file.wav -o:alsahw,1,0
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