[Csnd] routing to a specific soundcard
| Date | 2012-08-19 09:28 |
| From | Stefan Thomas |
| Subject | [Csnd] routing to a specific soundcard |
| Dear community, I would like to route the output to a specific card, via alsa. Off course I know that could be done with jack, but I have difficvulties with it. My output of cat /proc/asound/cards is: 0 [Intel ]: HDA-Intel - HDA IntelSo I tried it with csound -+rtaudio=alsa -o dac:S6USB20 -+rtmidi=alsa -Ma -b-1 -B 2048 -m0d myfile.csdand csound -+rtaudio=alsa -o dac:hw:1,0 -+rtmidi=alsa -Ma -b-1 -B 2048 -m0d myfile.csd but unfortunately without any success. In the first case I get Cannot open device 'S6USB20' (or for audio output: No such file or directoryin the second case the output gisves me some hope, but it also fails to make sound: *** Unable to set requested sample format on soundcardFailed to initialise real time audio output |
| Date | 2012-08-19 10:16 |
| From | Anders Genell |
| Subject | Re: [Csnd] routing to a specific soundcard |
Hi Stefan! In most cases alsa sets up a "plug" layer that handles automatic conversion, which might get rid of the "unable to set requested sample format". Try -o dac:plughw:1,0 and see if you get sound out. Mind you, this adds latency so if you're looking for extremely low such then other ways might be more suitable. Regards,
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| Date | 2012-08-19 10:53 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] routing to a specific soundcard |
In my experience, the plughw latency was not an issue. I used to get down to -b32 with it. On 19 Aug 2012, at 10:16, Anders Genell wrote:
Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie |
| Date | 2012-08-19 11:07 |
| From | Anders Genell |
| Subject | Re: [Csnd] routing to a specific soundcard |
Oh, good! I haven't tried it that low. If I understand it correctly it adds one extra buffer of same size as -b to perform the conversion on, so the latency will in general be doubled? I guess it won't be an issue at such small sizes though... Regards, /Anders
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| Date | 2012-08-19 11:15 |
| From | Anders Genell |
| Subject | Re: [Csnd] routing to a specific soundcard |
I think you are correct - the plug layer is transparent if no conversion is needed - but if the sample format needs to be changed, doesn't that also require conversion? Regards, Anders
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| Date | 2012-08-19 11:16 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] routing to a specific soundcard |
| Maybe it does. But I find the SR values that are returned by hw (as an error) to be very odd, so I was expecting that if you use the soundcard default SR that would not actually happen. Victor On 19 Aug 2012, at 11:07, Anders Genell wrote:
Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie |
| Date | 2012-08-19 11:23 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] routing to a specific soundcard |
| I guess so. Victor On 19 Aug 2012, at 11:15, Anders Genell wrote:
Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie |
| Date | 2012-08-19 11:25 |
| From | Victor Lazzarini |
| Subject | Re: [Csnd] routing to a specific soundcard |
| But if the comparison here is to jack, then all of these things could probably also be built in to the jack layer. It's hard to say without actually testing. Victor On 19 Aug 2012, at 11:23, Victor Lazzarini wrote:
Dr Victor Lazzarini Senior Lecturer Dept. of Music NUI Maynooth Ireland tel.: +353 1 708 3545 Victor dot Lazzarini AT nuim dot ie |