[SOLVED] Audio output device - 192Khz to 384Khz sampling rates

SyntaXErroR · September 7, 2017 at 9:06 PM

Hi,

My audio output is set to HD-AMP1 SPDIF (My amp's DAC USB input).

Sample rate is set to Best match.

My amp's DAC USB is properly detected, as 384khz capable, see kodi log :

09:01:48.031 T:140599197644928 NOTICE: Device 5

09:01:48.031 T:140599197644928 NOTICE: m_deviceName : iec958:CARD=HDAMP1,DEV=0

09:01:48.031 T:140599197644928 NOTICE: m_displayName : HD-AMP1

09:01:48.031 T:140599197644928 NOTICE: m_displayNameExtra: S/PDIF

09:01:48.031 T:140599197644928 NOTICE: m_deviceType : AE_DEVTYPE_IEC958

09:01:48.031 T:140599197644928 NOTICE: m_channels : FL,FR

09:01:48.031 T:140599197644928 NOTICE: m_sampleRates : 44100,48000,88200,96000,176400,192000,384000

09:01:48.031 T:140599197644928 NOTICE: m_dataFormats : AE_FMT_RAW,AE_FMT_S32NE

09:01:48.031 T:140599197644928 NOTICE: m_streamTypes : STREAM_TYPE_AC3,STREAM_TYPE_DTSHD_CORE,STREAM_TYPE_DTS_1024,STREAM_TYPE_DTS_2048,STREAM_TYPE_DTS_512

Why is there no option above 192khz in "Limit sample rate" setting ? Is there a way I can overide this (useless) limit ?

thanks for help

notes :

every audio file is streamed properly to DAC/Amp according to its resoltution up to 192khz, higher resolutions files are downsampled because of the above reason.

**lrusak** · September 8, 2017 at 6:44 AM Official Post

I'm not sure what you are wanting to do. It seems like what you are trying to do is get everything sampled at 384khz, why?

If you limit the sample rate it will resample everything above, which isn't what you want. Typically the "limit sample rate" option is to set a maximum sample rate, not a minimum.

SyntaXErroR · September 8, 2017 at 7:19 AM

Hi,

Sorry if I was not clear.

I want no resampling at all. I have some 384khz audio file, I had like them to be played at their native resolution (384khz) but kodi downsample them to 192khz.

In Kodi's settings I can't get any higher sample rate limit than 192khz. Why isn't there a 384 option or even "no limit" option ?

See settings screenshots below (FR), highlighted in yellow is the "limit sample rate" settings I can't overide. As already said, output sample config is set to "best match"

Thanks

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**lrusak** · September 8, 2017 at 7:42 AM Official Post

How do you know that everything is being resampled to 192khz? Can you please post a debug log after playing a 384khz file?

SyntaXErroR · September 8, 2017 at 7:57 AM

Because my DAC/AMP displays the actual "received" sample rate from USB.

Here is a debug :

dTIQ

Hi believe this is what I want to overide :

Code

08:47:46.651 T:140214724192000    INFO: CActiveAE::ApplySettings - limit samplerate for SPDIF to 192000

**lrusak** · September 8, 2017 at 8:15 AM Official Post

As far as I understand the "Limit sampling rate (kHz)" option is only used when using the "Fixed" Output configuration mode. Try setting this option to "Best Match" or "Optimized" if it isn't already.

see, Settings/System v16 - Official Kodi Wiki

SyntaXErroR · September 8, 2017 at 1:28 PM

thanks but as said, above result is with Best match selected.

Moreover, I have already tried all 3 output options (Best match, Optimized and Fixed) and Kodi request a max sample rate value for all of them. See screenshot.

So no solution there.

**lrusak** · September 8, 2017 at 5:27 PM Official Post

Ok apparently 384khz is out of spec for spdif devices. So lets just test by taking kodi out of the equation.

Please try stopping kodi via ssh, then using speakertest

Warning that this may blow up your AVR! I take no responsibility.

Code

systemctl stop kodi
speaker-test -D iec958:CARD=HDAMP1,DEV=0 -c 2 -r 384000 -t sine

and see what alsa reports.

you can start kodi again by rebooting or

Code

systemctl start kodi

EDIT:

Is this your device? Marantz CA | HD-AMP1

If so you need to make sure that you are using the USB type B plug in the back of the receiver. Spdif or the front USB won't support 384khz.

SyntaXErroR · September 8, 2017 at 6:46 PM

Thanks Irusak,

seems there is something wrong with some command parameters, tried several other options (not pasted below) but no success :

NUCLibreELEC:~ # speaker-test -D iec958:CARD=HDAMP1,DEV=0 -c 2 -r 384000 -t sine

speaker-test 1.1.2

Playback device is iec958:CARD=HDAMP1,DEV=0

Stream parameters are 384000Hz, S16_LE, 2 channels

Sine wave rate is 440.0000Hz

Sample format not available for playback: Invalid argument

Setting of hwparams failed: Invalid argument

NUCLibreELEC:~ # speaker-test -D iec958:CARD=HDAMP1,DEV=0 -c 2 -r 48000 -t sine

speaker-test 1.1.2

Playback device is iec958:CARD=HDAMP1,DEV=0

Stream parameters are 48000Hz, S16_LE, 2 channels

Sine wave rate is 440.0000Hz

Sample format not available for playback: Invalid argument

Setting of hwparams failed: Invalid argument

**lrusak** · September 8, 2017 at 6:56 PM Official Post

can you post the output of

Code

aplay -L

You can try using the correct device listed there as an argument in speaker-test

SyntaXErroR · September 8, 2017 at 7:32 PM

got it working : "default:CARD=HDAMP1"

Below is the error message for 384Khz

but something else is wrong since I also tried successfully with -r 192000 but DAC/AMP is receiving 48Khz

384 :

NUCLibreELEC:~ # speaker-test -D default:CARD=HDAMP1 -c 2 -r 384000 -t sine

speaker-test 1.1.2

Playback device is default:CARD=HDAMP1

Stream parameters are 384000Hz, S16_LE, 2 channels

Sine wave rate is 440.0000Hz

Rate set to 384000Hz (requested 384000Hz)

Buffer size range from 16384 to 131072

Period size range from 8191 to 8193

Using max buffer size 131072

Periods = 4

Unable to set hw params for playback: Invalid argument

Setting of hwparams failed: Invalid argument

192 :

NUCLibreELEC:~ # speaker-test -D default:CARD=HDAMP1 -c 2 -r 192000 -t sine

speaker-test 1.1.2

Playback device is default:CARD=HDAMP1

Stream parameters are 192000Hz, S16_LE, 2 channels

Sine wave rate is 440.0000Hz

Rate set to 192000Hz (requested 192000Hz)

Buffer size range from 8192 to 65536

Period size range from 4095 to 4097

Using max buffer size 65536

Periods = 4

was set period_size = 4096

was set buffer_size = 65536

0 - Front Left

1 - Front Right

Time per period = 5.676804

0 - Front Left

1 - Front Right

Time per period = 5.973334

0 - Front Left

SyntaXErroR · September 8, 2017 at 7:36 PM

Sorry, I know why, "default:CARD=HDAMP1" is HDAMP1 analog. I will get the right output.

**lrusak** · September 8, 2017 at 9:28 PM Official Post

I'm not sure what you mean. Did you get it to work?

SyntaXErroR · September 8, 2017 at 9:53 PM

Well, no.

Result of aplay -L provides my with 2 relevant output :

default:CARD=HDAMP1

HD-AMP1, USB Audio

Default Audio Device

iec958:CARD=HDAMP1,DEV=0

HD-AMP1, USB Audio

IEC958 (S/PDIF) Digital Audio Output

speaker-test -D default:CARD=HDAMP1 plays everything at 48khz for -r <= 192000 and then fails to play for -r >192000 (error message above)

speaker-test -D iec958:CARD=HDAMP1 fails to play, whatever -r value

**lrusak** · September 8, 2017 at 10:31 PM Official Post

No idea then.

Are you infact using the rear USB type B port?

SyntaXErroR · September 8, 2017 at 10:46 PM

using NUC's usb 3.0 type A out to DAC/AMP's USB type B in

I tried a few settings with asound.conf but no joy.

**kszaq** · September 8, 2017 at 10:50 PM

SyntaXErroR It looks like you need to use -F S32_LE for SPDIF output with speaker-test.

SyntaXErroR · September 8, 2017 at 11:13 PM

Thanks but I just got it fully working now, from 44.1 up to 384Khz. (incl. 352.8 Khz)

And guess how ? by applying exact same solution I suggested 3 years ago on openelec when I had crackling sound issue with a previous DAC !

I just remebered and found my old post, here it is if it helps ("Ykar"'s post #9).

OpenELEC Mediacenter - OpenELEC Forum - USB DAC - OE 4.0 resamples everything to 48kHz? (1/1)

But in short, asound.conf with below content, and selecting the "new" available audio output in Kodi audio settings.

pcm.device{
type hw

card 2
device 0

}
pcm.!default{

type plug

slave.pcm "device"

}