All Questions
24 questions
0
votes
0
answers
241
views
What causes 1 second of latency on a embedded linux with ALSA support and a simple c++ program?
I'm trying to develop a simple audio program that runs on a ADSL router. I found two GPL sources for other routers that have the same chips and I'm able to build kernel and rootfs. I already add ALSA ...
0
votes
1
answer
63
views
Making ticking sounds of different frequencies. Solves problem with alsa and jack by avoiding them
#!/usr/bin/env python3
import pygame
from array import (array)
from pygame.mixer import (Sound, get_init, pre_init)
class Electrode(Sound):
SEQUENCE = [
['A4', 440.00], ["A#", ...
- 1,173
0
votes
1
answer
94
views
Replacement for pa_alsa_linux.h and pa_jack.h with pipewire
I'm running Pop_OS 22.04 (which has pipewire audio) and audacity is hanging on launch (unless it is launch with sudo, which seems quite odd).
To try and debug the system, I'm trying to build audacity ...
- 126
0
votes
0
answers
72
views
portaudio ALSA Pulse Jack Raspian
I have a RPI 4 running in Raspian (Dec 2020) and they use Pulse audio on top of ALSA.
The ARM portaudio lib calls functions in the Jack audio lib so if I link that lib
with the portaudio lib in a C ...
0
votes
0
answers
123
views
How to use JavaSound Midi on Linux using FireWire AudioInterface?
I'm using QJackCtl and FireWire Audio Interface(Edirol FireWire AudioCapture FA-101).
I made program which connect JavaSound Synthesizer Gervill and External USB Midi Keyboard, it triggers Gervill ...
2
votes
0
answers
502
views
Detect if linux usb gadget (audio uac1) get accessed by the host
Problem: How can I detect when the audio UAC1 gadget is used from a host device?
Background: I created a USB audio gadget using USB Audio Class 1 (UAC1) to send/receive audio over USB from a Linux ...
- 45
1
vote
1
answer
582
views
Sound Not Recorded in GUVCView - Possible ALSA/JACK Issue
I can't seem to record sound on any integrated (Using Linux Manjaro) Video/Audio recorder. I have tried using GUVCView from the command line and I get the following error:
V4L2_CORE: (UVCIOC_CTRL_MAP) ...
3
votes
1
answer
1k
views
Static linking of linux audio libraries
I'm working on an audio library that's targeting both Windows and Linux. For the Windows backends I support DirectSound, WASAPI and ASIO, and for Linux it's ALSA, JACK and PulseAudio. Recently the ...
- 1,110
1
vote
2
answers
591
views
Raspberry Pi 3 A+ distorted/screeching audio when using ALSA + Jackd2 through on-board headphone jack
I am trying to set up Supercollider on my Raspberry Pi 3 A+ on Raspbian Lite using this guide. Jackd2 and Supercollider both compile fine, and there are no errors when I try to run Supercollider or ...
5
votes
2
answers
5k
views
Sharing a microphone audio stream on Linux
As much as it matters my scenario is developing an accessibility application not any kind of malicious eavesdropping, whereas also within this scenario there are various research and development ...
- 13.7k
18
votes
1
answer
10k
views
How to setup a virtual mic and pipe audio to it from node.js
Summary of what I am trying to achieve:
I'm currently doing some work on a Discord bot. I'm trying to join a voice channel, which is the easy part, and then use the combined audio of the speakers in ...
- 878
0
votes
2
answers
2k
views
jack_connect MIDI (Alsa) ports
I am having a hard time, figuring how can I instruct jack to connect 2 ALSA (MIDI) ports.
I can do it no problem, through qjackctl. And also use jack_connect to connect 2 audio ports using.
Now I ...
- 87
1
vote
1
answer
3k
views
Making Jack work with Alsa on Raspberry
I have a working Raspberry Pi 3B.
The OS is Raspbian Stretch.
Default on-board Broadcom audio disabled.
USB SoundBlasterG1 audio card plugged in and configured as hw:0
nano /etc/asound.conf
pcm....
- 164
1
vote
0
answers
2k
views
How to remove PyAudio errors?
I am trying out a solution to an accepted question that demonstrates how to create a beep with PyAudio. Strangely I see quite a lot of errors. Unfortunately I've never sent any audio data ...
- 3,426
0
votes
1
answer
1k
views
QJackCtl Scripting start alsa_in after launch
so I'm trying to get QJackCtl to launch an instance of alsa_in to control an extra audio device after I start the Jack server. I've put this code in the execute after startup section:
alsa_in -j ZOOM ...
- 161
0
votes
1
answer
190
views
Cadence not showing ALSA driver tab
I recently reinstalled Cadence and the ALSA tab no longer appears in the configuration. How can I get it back?
- 41
1
vote
1
answer
5k
views
modprobe: ERROR: could not insert 'snd_aloop': No such device
I'm trying to make a Jack-ALSA bridge on gentoo, but I cannot load the snd_aloop module.
Kernel:
$ uname -a
Linux MalfattiTux 4.6.7-rt-rt11 #1 SMP Thu Sep 22 14:54:42 BRT 2016 x86_64 Intel(R) Core(...
- 60
4
votes
2
answers
3k
views
PortAudio unreliable: Expression '...' failed
I'm currently experimenting with real-time signal processing, so I went and tried out PortAudio (from C).
I have two audio interfaces on my computer, onboard sound (Intel HD Audio) and a USB audio ...
- 375
8
votes
2
answers
4k
views
Linux how to record sound in RAM buffer and playback audio with custom delay
I need to send audio from a radio to a secondary system using an embedded linux system.
The secondary system needs to set up a communication channel which takes a few seconds.
So if I don't want to ...
- 5,317
4
votes
3
answers
6k
views
Capturing sound on Linux with low latency
I want to capture audio on Linux with low latency in a program I'm writing.
I've run some experiments using the ALSA API, using snd_pcm_readi() to
capture sound, then immediately using ...
- 627
4
votes
1
answer
1k
views
SuperCollider without jack server
One of the requirements in my project is to reduce runtime footprint on an embedded system. It looks like jackd is required on Linux and seem like it's currently a hard dependency and it cannot use ...
- 6,902
1
vote
1
answer
4k
views
jack audio and multiple audio devices with alsa_out
Does anybody knows why I can't use two instances of alsa_out with jack? I have 3 soundcards and I want to use them at the same time. I have one inside my computer and two usb devices. This is my setup:...
- 73
2
votes
0
answers
5k
views
jack audio to generate a virtual sound card and input in it
I receive 4 channel input via network in jack. and like to route this to a program which is not a jack client. in the program setting one can choose a sound card to read from.
so to route audio from ...
7
votes
1
answer
16k
views
PyAudio trying to use JACK
I'm running PyAudio under Python 2.6.6 and would like it to use ALSA and not JACK.
In [1]: import pyaudio
In [2]: pa = pyaudio.pa
In [3]: pa.initialize()
Cannot connect to server socket err = No ...
- 4,495