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Old 7th April 2014, 11:22 AM   #501
PET240 is offline PET240  Australia
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Not to be rude, but what question? That reads as a statement to me is all.

Chuz,


Drew.
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Old 7th April 2014, 11:25 AM   #502
miero is offline miero  Czech Republic
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(technical details)

From the Linux sound interface ALSA side there are two DSD formats:
- SND_PCM_FORMAT_DSD_U8
- SND_PCM_FORMAT_DSD_U16_LE

With ability to play up to 352.8/384kHz it would be possible to play:
- DSD64 in U8 and U16_LE format (stereo)
- DSD128 in U16_LE format (stereo)

The DSD128 in U8 format will need to be transcoded to U16_LE format (automatically using ALSA plugin), because 705.6kHz is too much for BBB.

The .dsf or .dff should be handle by player, not the driver.
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Old 7th April 2014, 11:35 AM   #503
linuxfan is offline linuxfan  Australia
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Sorry PET-240. I thought you were asking for confirmation.
Actually both .dff and .dsf support metadata, in a limited fashion.
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Old 7th April 2014, 11:44 AM   #504
PET240 is offline PET240  Australia
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Heya linuxfan,

My understanding of dsd is still limited and am on a learning curve as I am looking to record vinyl in dsd128 on a korg unit, be nice to play it back as a native without resampling etc, can you please provide details on what you know?

Miero,

That code is gobblygook to me, Im just gonna believe you know what you are doing.......waaaay outta my league!!!!
To learn something, can you please explain the U8 and U16 differences? and what the LE is ?

Regards the player, hence asking Russ if the Buff III will handle both the .dsf snd .dff file formats.

Really appreciate the major efforts with this!!!

Chuz,

Drew.
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Old 7th April 2014, 11:51 AM   #505
miero is offline miero  Czech Republic
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PET-240: you should ask that question to developer of player ... not here :-)

(more offtopic)
U8 vs U16 ... how many bytes is pushed to DSD channel ... U8 pushes 1 byte, U16 puses 2 bytes at once
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Old 7th April 2014, 11:59 AM   #506
miero is offline miero  Czech Republic
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Regarding LCD capes. I've checked datasheets of 4 available LCD capes and none of them is without conflict with the audio cape:

LCD3: P9_27 (D4 vs USER_LED1), P9_30 (D1 vs GPIO3_16)
LCD4: P9_27 (D4 vs LCD_DISEN), P9_24 (MCLKSEL vs GPIO0_15), P9_26(D3 vs TSC_INT), P9_30 (D1 vs GPIO3_16)
LCD7: P9_30 is not routed (D1)
4D 4.3: P9_27 (D4 vs GPIO3_19), P9_24 (MCLKSEL vs GPIO0_15), P9_30 (D1 vs GPIO3_16)

The LCD7 seems to be the best possibility of these:
- it does not require to be connected at the top
- shares only one data pin with audio cape

This data pin is the first McASP data pin and. Pins are after recent change routed in the increasing order 1-2-3-4 which means that if driver would use only 2-3-4 then the I2S/DSD switching feature will not work.

So ... LCD7 might be usable after reconfiguring the driver, but the audio cape automatic I2S/DSD pin remapping would not be usable.

In other words, the one will need to switch cables manually.
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Old 7th April 2014, 12:03 PM   #507
miero is offline miero  Czech Republic
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Another thing, I've not tested the audio with the HDMI output. But I'm sure it will be at least a bit slower. Which means, that DSD might not work either way.
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Old 7th April 2014, 12:27 PM   #508
Russ White is offline Russ White  United States
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System overhead incurred by using the LCD cape seems a bit undesirable.

I would prefer remote UIs even a separate BBB
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Old 7th April 2014, 04:22 PM   #509
clsidxxl is offline clsidxxl  France
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Quote:
Originally Posted by clsidxxl View Post
Russ, Have you an idea of the clocks you want to put on the cape.
Hi Russ,it is still secret
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Old 7th April 2014, 04:37 PM   #510
Russ White is offline Russ White  United States
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Sorry I simply forgot to answer

The plan is to use the CCHD-957

http://www.crystek.com/crystal/spec-...k/CCHD-957.pdf
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