[Alsa-user] Route input channels

Hi, If I have a USB soundcard with say 8 channels, how do I route channels 7+8 to a stereo capture device? Regards /R The information in this email (including any attachments) may contain confidential and/or proprietary material. Any review, retransmission or use of this information by

Re: [Alsa-user] USB ALSA card number

Setting options snd-usb-audio index=5 in alsa-base.conf seems to do the trick, thanks! Regards /R -Original Message- From: Ralf Mardorf Sent: Sunday, 22 November 2020 16:10 To: alsa-user@lists.sourceforge.net Subject: Re: [Alsa-user] USB ALSA card number Hi, I'm using the below

[Alsa-user] USB ALSA card number

I have a system where I need USB attached audio devices to start numbering from ALSA card5 and upwards (i.e. card0 to card4 are reserved). Is this possible? Regards /Robert The information in this email (including any attachments) may contain confidential and/or proprietary material. Any

Re: [Alsa-user] PCM plugin last

Hi Clemens, > The dmix plugin plays shared-memory tricks with the ring buffer and therefore > requires to run on top of a hw device. > It might be possible to run dmix on a virtual loopback sound card and route > that one to the LADSPA plugin, but I guess using PulseAudio would be a better >

[Alsa-user] PCM plugin last

I’d like to know if there is any way to get the following sound chain through ALSA: Mediaplayer -> dmix -> LADSPA -> plughw:0,0 For my application it is crucial that the LADSPA plugin be applied AFTER dmix. Regards /Robert The information in this email (including any attachments) may contain

Re: [Alsa-user] ALSA PCM plugin lifetime

On a similar note, the sample rate seems to be specified when instantiating the PCM plugin, but I’m not aware if frames per buffer is ? From: Robert Bielik Sent: Monday, 18 May 2020 10:39 To: alsa-user@lists.sourceforge.net Subject: ALSA PCM plugin lifetime Hi all, I have a system setup where

[Alsa-user] ALSA PCM plugin lifetime

Hi all, I have a system setup where I need a post-processing ALSA PCM plugin. But how is the lifetime managed by the ALSA server? Will the plugin only be instantiated whilst there is an audio stream running? Is it possible to setup an ALSA configuration that keeps the PCM plugin instantiated,

Re: [Alsa-user] List devices

> So I guess its a ALSA version issue ☹ ALSA version where hints work is 1.1.3 and where they don't version is 1.0.29. /R -- Check out the vibrant tech community on one of the world's most engaging tech sites,

Re: [Alsa-user] List devices

Whereas on the target platform: Advanced Linux Sound Architecture Driver Version k4.1.25. So I guess its a ALSA version issue ☹ Regards /R > > Regards > /Robert > > > -Original Message----- > > From: Robert Bielik > > Sent: den 6 september 2018 14:46 > &g

Re: [Alsa-user] List devices

orge.net > Subject: Re: [Alsa-user] List devices > > Robert Bielik wrote: > > I cannot get it listed with ALSA API function snd_device_name_hint. > > This is undocumented; see the "hint" entries in

[Alsa-user] List devices

Hi, I have a dmix plug that's connected to hw dev 1 (/etc/asound.conf): pcm.i2s_play { type dmix ipc_key 1024 ipc_key_add_uid 0 slave { pcm { type hw card 1 }

Re: [Alsa-user] Help to set up a simple sound card

Hmm... I was a bit too fast there... > aplay -L > null > Discard all samples (playback) or generate zero samples (capture) > pulse > PulseAudio Sound Server Can you try playing through pulseaudio with: aplay -D pulse test.wav ? Regards /R

Re: [Alsa-user] Help to set up a simple sound card

Yó napot kivánok!  Take a look at https://alsa.opensrc.org/Dmix , dmix is the ALSA plugin you should use for this. Regards /Robert > -Original Message- > From: Csányi Pál [mailto:csanyi...@gmail.com] > Sent: den 10 februari 2018 12:02 > To: Alsa User

Re: [Alsa-user] Redorder cards

> I'm trying to reorder my soundcards on a RPi so that the I2S based cards > always is index zero. I looked at the docs > (https://alsa.opensrc.org/MultipleCards), which just says, "easy peasy, just > use options snd slots=this, that". Problem is that nowhere is it documented > WHAT "this, that"

[Alsa-user] Redorder cards

Hi, I'm trying to reorder my soundcards on a RPi so that the I2S based cards always is index zero. I looked at the docs (https://alsa.opensrc.org/MultipleCards), which just says, "easy peasy, just use options snd slots=this, that". Problem is that nowhere is it documented WHAT "this, that" is!

Re: [Alsa-user] splitting a 4 channel usb sound card into master and headphone

Would the dshare plugin do this for you ? http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html Regards /Robert > -Original Message- > From: Samuel Nicholas [mailto:nicholas.sam...@gmail.com] > Sent: den 1 februari 2018 22:09 > To: alsa-user@lists.sourceforge.net > Subject:

[Alsa-user] dmix with non-hw slave ?

I want to setup a system where JACK manages a low latency path for audio in/out, and where ALSA apps use the ALSA JACK PCM plugin (http://jackaudio.org/faq/routing_alsa.html) Is it possible on the ALSA side to setup dmix to use the "jack" type plugin as backend ? Or will the jack plugin do the

Re: [Alsa-user] Dmix problem

> > is there some ALSA plugin that can coalesce buffering ? Meaning that > > the plugin can take f.i. larger period_size than what the dmix device > > is working with ? > > What problem would that solve? Not sure. It would allow clients connecting to that device to have a more relaxed callback

Re: [Alsa-user] Dmix problem

Hi Clemens, > >> Is there any other plugin doing the same thing as dmix... but working ? > > Yes, dmix with a larger buffer size (i.e., more periods). Hmm. Yes. I've tried running aplay with "chrt --rr 99" and it got way more stable, even at as low a settings as 64 frames (period_size) + 2

Re: [Alsa-user] Dmix problem

> The reason is that for my project I need to have as low a latency as possible > in > the dmix chain. Is there any other plugin doing the same thing as dmix... but > working ?  More specifically, I'd need a mixing plugin that does not do sample rate conversion, i.e. each client connecting to

[Alsa-user] Dmix problem

Hi, I'm using the audioinjector octocard on a R Pi 3, and I have a problem where the system default dmix (dmix:0,0) plays just fine (via aplay), but my own defined dmix device occasionally stops streaming with a xrun condition: Status(R/W): state : RUNNING trigger_time: 13953.124684

Re: [Alsa-user] Strange i/o problem

); playback.putBuffer(out_buffer); } } Regards /R > -Original Message- > From: Robert Bielik > Sent: den 15 januari 2018 17:59 > To: alsa-user@lists.sourceforge.net > Subject: RE: Strange i/o problem > > Yet more info, the output of snd_pcm_hw_params_dump and >

Re: [Alsa-user] Strange i/o problem

age- > From: Robert Bielik > Sent: den 15 januari 2018 17:47 > To: Robert Bielik <robert.bie...@dirac.com>; alsa-user@lists.sourceforge.net > Subject: RE: Strange i/o problem > > Ah, forgot to mention a couple of things, this is on a Raspberry Pi 3 with > Raspbian Stretc

Re: [Alsa-user] Strange i/o problem

, 666, 722, 2.2253 min, mean, max, stddev: 656, 666, 680, 1.57805 min, mean, max, stddev: 643, 666, 683, 1.54424 (which to me looks more than OK) > -Original Message- > From: Robert Bielik [mailto:robert.bie...@dirac.com] > Sent: den 15 januari 2018 17:41 > To: alsa-user@lists.sou

[Alsa-user] Strange i/o problem

I have a strange problem: I'm trying to pipe audio input -> output using a I2S device @48000 Hz and 32 frames buffer size and 2 periods, to get as low a latency as possible. It works nicely if I either: 1. Use capture + playback and record capture to a wav file (sounds fine). 2. Use playback

Re: [Alsa-user] List pcms

Ok, hehe... found the problem, I was running gdbserver as root so it was the wrong .asoundrc I changed... > -Original Message- > From: Robert Bielik [mailto:robert.bie...@dirac.com] > Sent: den 8 januari 2018 10:30 > To: alsa-user@lists.sourceforge.net > Subject: [Alsa-

[Alsa-user] List pcms

I've come across an odd behavior: If I add a dummy pcm in .asoundrc : pcm.dummy { type plug slave.pcm "plughw:0,0" } I can see it listed with aplay -L. However, my own code, which uses the same exact mechanism as aplay does (snd_device_name_hint) does NOT list the dummy device.

Re: [Alsa-user] Problems opening devices

age- > From: Clemens Ladisch via Alsa-user [mailto:alsa-user@lists.sourceforge.net] > Sent: den 7 januari 2018 12:25 > To: alsa-user@lists.sourceforge.net > Subject: Re: [Alsa-user] Problems opening devices > > Robert Bielik wrote: > > After this I try snd_pcm_open on t

Re: [Alsa-user] Problems opening devices

Mind you, this works nicely: > aplay -D default:CARD=MOXF6MOXF8 test.wav So I guess I must be doing something wrong ☹ /R > -Original Message- > From: Robert Bielik [mailto:robert.bie...@dirac.com] > Sent: den 7 januari 2018 10:16 > To: alsa-user@lists.sourceforge.net &

[Alsa-user] Problems opening devices

Hi all, I am implementing an ALSA backend for an in-house cross-platform C++ audio framework, but I have serious problems doing ALSA. My hardware is a Raspberry Pi 3 running Raspbian Stretch, having an I2S soundcard as the main card. I enumerate the PCM devices with the snd_device_name_hint

[Alsa-user] LV2 wrapper

I've used the ALSA LADSPA PCM plugin, and it works nicely. However, I'd like to use LV2 plugins aswell. Is there such a project active somewhere ? Rgrds /R -- Check out the vibrant tech community on one of the world's

Re: [Alsa-user] Route input to output with minimal latency

Dear Clemens, Thank you so much for the alsaloop tip, I just ran it with: > chrt -rr 70 alsaloop -f S32_LE -C plughw:0 -P plug:ladspa -l 48 And it works perfectly, exactly what I needed!  Regards /Robert > -Original Message- > From: Robert Bielik [mailto:robert.bie...@

Re: [Alsa-user] Route input to output with minimal latency

Hello Clemens, > Otherwise, you have to do the capture and playback in software. See the > alsaloop tool. What latency you can reach depends on how much other > applications and drivers interfere with the scheduling; on the Pi, typical > culprits are WiFi, ethernet, or USB. > Also see

[Alsa-user] Route input to output with minimal latency

Hi all, I want to route input to output with minimal possible latency, this will run on a Raspberry Pi, and the latency should be < 1 ms. I was thinking... if the ALSA capture and playback device is mmapped to the same buffer area, this should be dealt with automatically. Is this possible ?

[Alsa-user] LADSPA ALSA plugin

Hi all, Started experimenting using LADSPA plugins with the ALSA LADSPA PCM plugin, and it works nicely. However, it seems only the PCM interface is exposed from the plugin. Question is if there is a way to expose the LADSPA plugin parameters directly to alsamixer ? Regards /Rob