[AudioI] Toslink input

[Matt]

There are a few different approaches to multichannel output.

One approach is the Octo sound card with 8 outputs and 6 inputs. The 
inputs can be time aligned in software to ensure that no channel 
swapping occurs. It is assume this approach can also then be used to 
ensure the outputs don't have channel swapping either. Some people have 
reported methods to ensure there is no output channel swapping based on 
using a jackd subsystem at startup and never stopping it.

Another approach is to use one Pi as the I2S bus owner - doing all of 
the clocking. Then you can have one Pi per TDM slot. For example, the 
one sound card can dump I2S input which all Pi can read. Each Pi can 
then do the processing and do stereo output.

Matt

On 24/7/20 10:49 am, Peter Heydenrych via People wrote:
> Not really...I am trying to build a more flexible version of the 
> obsolete MiniDSP OpenDRC-DA8, but with optical input, balanced output 
> and more flexible processor. With a Pi 4 and Ultra 2 I am almost there...
>
> Peter Heydenrych
> peter at heydenrych.net
>
>
>
> On Fri, 24 Jul 2020, at 08:13, Matt via People wrote:
>>
>> Perhaps we should do a digital input + analogue output board.
>>
>> To do digital input properly it needs a software interface. The board 
>> is meant to tell the software what the incoming sample rate is.
>>
>> Do you have any ideas around that ?
>>
>> Matt
>>
>> On 24/7/20 9:20 am, Peter Heydenrych via People wrote:
>>> I'd love to use the 8 balanced outputs of the Ultra 2 - just need an 
>>> optical input instead of the analogs...
>>>
>>> Peter
>>>
>>> On Fri, 24 Jul 2020, at 07:18, Matt via People wrote:
>>>>
>>>> To add a toslink input, it would need to operate the I2S clocks - 
>>>> that would require a different hardware topology to the current 
>>>> devices.
>>>>
>>>> I think we should do a new product based on this concept. Would you 
>>>> be using outputs ? If so what type of output would you want ?
>>>>
>>>> Matt
>>>>
>>>> On 24/7/20 8:40 am, Peter Heydenrych via People wrote:
>>>>> Thanks for the quick reply, Matt. Would it be possible to add 
>>>>> another device to bring in a Toslink signal? Do you know of 
>>>>> anything that would be compatible?
>>>>>
>>>>> Peter
>>>>>
>>>>>
>>>>> On Fri, 24 Jul 2020, at 06:37, Matt via People wrote:
>>>>>>
>>>>>> Hey Peter,
>>>>>>
>>>>>> I would love to be able to do this, however that tollink 
>>>>>> connector is driven by the codec. They do the I2S to S/PDIF 
>>>>>> conversion on chip. S/PDIF receiving is more complex then sending 
>>>>>> because we also need to interrupt the operating system to notify 
>>>>>> it of a sample rate change.
>>>>>>
>>>>>> Perhaps it is a good idea to do a future project with the S/PDIF 
>>>>>> injection capability.
>>>>>>
>>>>>> Matt
>>>>>>
>>>>>> On 24/7/20 8:27 am, Peter Heydenrych via People wrote:
>>>>>>> Hi all,
>>>>>>>
>>>>>>> I have just ordered an Ultra 2 but now see the Toslink option is 
>>>>>>> an output.
>>>>>>> Is there any possible way to add a Toslink input to a Pi + Ultra 
>>>>>>> 2 system?
>>>>>>> I'd prefer it if the Toslink output could be converted to an 
>>>>>>> input, but adding another module to the system would be acceptable.
>>>>>>>
>>>>>>> Thanks,
>>>>>>>
>>>>>>> Peter
>>>>>>>
>>>>>>>
>>>>>>>
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