Re: SPDIF/IEC958 sample rate on HDA/ALC882

[Erik Slagter <erik@slagter.name>]

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Takashi Iwai wrote:

>> Also I really don't get the relationship between the sample rate of the
>> wav file I'm using for testing (with aplay) and iecset. I'd expect that
>> aplay would set the sample (locking) rate of the spdif interface to the
>> sample frequency as the wav file, what is the use of iecset (rate) then?
>> I am using hw:0,0 to really avoid software resampling.

> Well, still I didn't write what you did and what you got...

Spotted well, it takes some time to recreate the complete test suite.

I will have a go once more with newer alsa libs/utils and then submit
the results. I wasn't too eager before because I didn't get any reply
for weeks...

>>>>>> Maybe I am using the wrong "hw", there is also a "hw:0,2" device, which
>>>>>> I cannot make work properly at all (only one channel is output, large
>>>>>> chunks are discarded, much much clipping).
>>>>> The first PCM device is for the multi-output PCM.  It's for both
>>>>> analog and digital.  The dedicated SPDIF is the secondary one.
>>>> But why does the second interface gives _some_ (although wrong) output
>>>> on my spdif output then?
>>> No idea, possibly wrong parameters are passed.
>> By whom or what? Actually I don't care that much, but it looks like a
>> bug to me.
> Possibly.  But too little information to analyze.

I think you're misunderstanding me here.

aplay -Dhw:0,0 sample.wav gives valid sound through spdif (though
limited), but aplay -Dhw:0,1 gives garbage on the same spdif output.
That doesn't look like an issue of aplay or the alsa lib, but a driver
issue.

>> [ rate bitfields in proc #codec# output ]
> Try HG version, and you'll see what they mean better.

The driver version in the kernel is kind of recent, so I really doubt
that. If you can give me a pointer to a file that has defines or enums,
that actually resolve to numbers, for this bitfield, I'd be obliged.


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