Re: ESI Juli@ - 24/96 - SPDIF

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Hi,

On Tuesday 15 December 2009 03:42:20 pm Jaroslav Kysela wrote:
> On Fri, 11 Dec 2009, Peter Vrabec wrote:
> > Hi all,
> >
> > please can you help me.  I can't play 24bit samples on ESI Juli@ thru
> > optical out.
> >
> > driver: snd_ice1724
> > alsa version: I need to find out when I get home. But something in
> > Fedora11. I guess 1.0.21.
> >
> > $ aplay -D plughw:1,1  01.Desafinado.wav
> > Playing WAVE '01.Desafinado.wav' : Signed 24 bit Little Endian in 3bytes,
> > Rate 96000 Hz, Stereo
> >
> > $cat /proc/asound/card1/pcm1p/sub0/hw_params
> > access: MMAP_INTERLEAVED
> > format: S32_LE
> > subformat: STD
> > channels: 2
> > rate: 96000 (96000/1)
> > period_size: 2048
> > buffer_size: 8192
> >
> > result: no sound
> > Note I didn't get any error/warning.
> >
> > same results with
> > speaker-test -c2 --device  plughw:1,1 --rate 96000 --format S24_LE
> >
> > but I can hear some noise with:
> > speaker-test -c2 --device  plughw:1,1 --rate 44100 --format S16_LE
> > speaker-test -c2 --device  plughw:1,1 --rate 96000 --format S32_LE
> > I guess noise is expected (OK), isn't?
> >
> > My goal is to play bit perfect 16/44.1 and 24/96 via optical out into my
> > DAC Styleaudio Topaz.
> 
> You hit probably two bugs. I was able to reproduce the speaker-test
> problem - the S24_LE format is not supported in this tool (so you got
> silence). This tool didn't check the supported formats. I added
> appropriate checks to the ALSA GIT repository:
> 
> http://git.alsa-project.org/?p=alsa-utils.git;a=commitdiff;h=075becdb1ace74
> 3149eae9a32bc48f22d027092f
> 
> Unfortunately, I don't know the reason, why aplay does not play
> your wav file. I have one S24_LE file here and it is played on
> 96kHz/24-bit hardware without problems. Could I download your .wav file
> somewhere for tests? Or you may try to test another player.
Jaroslav, my problem is already solved. It sounds silly  but problem was NOT 
in ALSA. I have played with different  sample rates and discovered that when I 
get to lower rates I can actually hear the sound (not just noise). Lower 
sample rates -> more sound and less noise. To make story short - problem was 
my optical switch. 

So the message for all would be: be cautious about optical switch devices, my 
was pretty cheap and it could not handle 24/96. I have no problems with 
16/44.1-96. I'm not sure if this make sense it's just experience.

Peter.

>  						Jaroslav
> 
> -----
> Jaroslav Kysela <perex@xxxxxxxx>
> Linux Kernel Sound Maintainer
> ALSA Project, Red Hat, Inc.
> 

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