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Alsa Opensrc Org - Independent ALSA and linux audio ...
https://alsa.opensrc.org/Device
card is a number ("0", "1", "2", etc.) which specifies to which kernel audio device the ALSA device belongs. The kernel device might be a physical card (such as a SoundBlaster or Ensoniq) or a virtual device (such as the "virmidi" virtual MIDI device). device is the number of the ALSA device on the specified card .
Alsa virtual device as sink for Pulseaudio / Multimedia ...
https://bbs.archlinux.org/viewtopic.php?id=202316
$ cat /etc/asound.conf # this upmix front channels to rear ones (which are mixed to subwoofer probably on driver level) pcm.upmix4021 { type plug slave.pcm lowpass2121 slave.channels 4 ttable { 0.0 1 1.1 1 2.2 1 3.3 1 0.2 1 1.3 1 } } # this should apply low pass filter for rear channels (played by subwoofer) pcm.lowpass2121 { type …
Asoundrc - AlsaProject
https://www.alsa-project.org/main/index.php/Asoundrc
Now you can call this newly created virtual device by: aplay -D rate_convert test.wav Which automatically converts your samples to a 44.1 kHz sample rate while playing.
Playing with ALSA loopback devices | Playing with Systems
https://sysplay.in/blog/linux/2019/06/playing-with-alsa-loopback-devices/
snd-aloop is the kernel module for setting up virtual audio loopback devices. $ sudo modprobe snd-aloop creates two devices 0 & 1 under a new “Loopback” card for both playback & capturing, as shown below, respectively: Playback Devices Capture Devices In the above images, the card 2 is the loopback card.
linux - Create virtual device in .asoundrc file - Unix ...
https://unix.stackexchange.com/questions/310164/create-virtual-device-in-asoundrc-file
I have been trying to create a virtual device to record the internal audio of my sound card using pure ALSA. After googling a lot, I found a .asoundrc file¹ that is very near of what I am looking for:. pcm.mycard { type hw card 0 } ctl.mycard { type hw card 0 } pcm.myconvert { type plug slave { pcm "myrecord" format S16_LE } } pcm.myrecord { type file format "raw" slave.pcm "mycard" file ...
pulseaudio - How to route pulse audio device into alsa ...
https://askubuntu.com/questions/895216/how-to-route-pulse-audio-device-into-alsa-loopback-virtual-microphone
So this means the capturing of this audio stream has to be done via /dev/snd/pcmC2D1c; if you select loopback as the input device for flash, it will use /dev/snd/pcmC2D0c instead ( plugin-co means the plugin container flash is running in): user@desk:~$ lsof | grep /dev/snd/pcmC2 pulseaudi 3314 user mem CHR 116,13 556 /dev/snd/pcmC2D0p pulseaudi ...
How To: Patch Qemu and Fix VM Audio - The …
https://passthroughpo.st/how-to-patch-qemu-and-fix-vm-audio/
On Arch, Uninstall the pulseaudio-alsa package and remove /etc/asound.conf as well as ~/.asoundrc. Now PulseAudio needs to be configured to use ALSA‘s dmix device which prevents it from claiming your hardware exclusively.
linux - How to register a virtual card to alsa from user ...
https://stackoverflow.com/questions/15134751/how-to-register-a-virtual-card-to-alsa-from-user-space
Alsa user-space lib simply open every /dev/snd/controlC# from 0 to 32 and launch ioctl (SNDRV_CTL_IOCTL_CARD_INFO, ...); in order to build a list with the installed sound-cards if we mount our UmView module on /dev/snd/control# and we hijack the ioctl and answer to it, our module will be identified as a sound-card by ALSA
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