[PD] RPI stereo USB audio was: audio interface with multiple ins on raspberry pi

[Antoine Rousseau]

I've never had much trouble (rpi2/3/3b/3b+/4...)  with this kind of thing:
https://www.gotronic.fr/art-adaptateur-audio-usb-21834.htm (warning:
unfortunately mono input only)
I could run full-duplex Pd at less than 10ms latency (of course it depends
on your actual patch).

However older (while more expensive) boards (like Alesis io4) have
sometimes been a lot trickier!

So it seems to me that it depends more on the audio device than on the
computer model.


Le mer. 7 oct. 2020 à 15:58, Dan Wilcox <danomatika at gmail.com> a écrit :

> Thanks Josh, good to know. Now that the RPI 4 has a controller chip, I
> should probably try one again.
>
> I had some success for a project using a quad-core Udoo board circa 2013
> but it was also more expensive than the Pis at that time and a bit
> overkill. It *did* however have a USB controller chip.
>
> On Oct 7, 2020, at 3:42 PM, Josh Moore <kh405.7h30ry at gmail.com> wrote:
>
> The Pi 2 and 3's usb were very much hacks due to the limitations of the
> Broadcom chip. It's fixed in the Pi4. See here for info:
> https://www.raspberrypi.org/documentation/hardware/raspberrypi/usb/README.md
>
>
>
>
>
> On Wed, Oct 7, 2020 at 5:18 AM Dan Wilcox <danomatika at gmail.com> wrote:
>
>> To add on to Chris's question with a tangent, have any of you had good
>> experience with bog-standard stereo USB Audio interfaces and RPI 3 or 4?
>>
>> Some years ago now, I tried to use an RPI 2 with my trusty USB 1.1
>> standard audio interface (Roland Edirol UA-25) which is full-duplex stereo,
>> 2 in / 2 out. I could never get it to work well in full-duplex mode without
>> dropouts, even with a low-latency kernel and other real-time tweaks. In the
>> end, it seemed the USB driver on the RPI was simply not designed for the
>> "isynchronous audio" this requires.
>>
>> The same device worked well on my original wearable, a Pentium 3 500 MHz
>> machine but with a dedicated USB controller chip.
>>
>> In the end, I decided to move toward iOS for embedded/wearable (hence
>> PdParty) and the same device works very well at low-latencies on iPads and
>> my (now old) iPhone 5S.
>>
>> I'd like to still be able to run the setup with alternate systems, so
>> does anyone have experience that the USB drivers have been improved? Thanks
>> in advance
>>
>> On Oct 6, 2020, at 12:00 PM, pd-list-request at lists.iem.at wrote:
>>
>> Date: Tue, 6 Oct 2020 10:48:48 +0800
>> From: Chris McCormick <chris at mccormick.cx>
>> To: PD List <pd-list at iem.at>
>> Subject: [PD] audio interface with multiple ins on raspberry pi
>> Message-ID: <5f3198d4-6210-4b41-d3a6-2cccbd3aae0a at mccormick.cx>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> Hey all,
>>
>> Same question as the previous poster but I was wondering about inputs
>> rather than outputs. Ideal solution:
>>
>>  * USB.
>>  * Low cost.
>>  * More than 2 channels in.
>>  * Headphone sized jacks.
>>  * Works with Raspberry Pi.
>>
>> I've searched but could not find such a beast. Any hints?
>>
>> Cheers,
>>
>> Chris.
>>
>>
>> --------
>> Dan Wilcox
>> @danomatika <http://twitter.com/danomatika>
>> danomatika.com
>> robotcowboy.com
>>
>>
>>
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>
> --------
> Dan Wilcox
> @danomatika <http://twitter.com/danomatika>
> danomatika.com
> robotcowboy.com
>
>
>
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