bytedeco/javacv

Raspberry Pi 4B USB Camera(with Onboard microphone) can not get audio

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#1,748 opened on Feb 10, 2022

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Description

Hi! I try to capture audio in the following two ways, but all failed:

AudioFormat audioFormat = new AudioFormat(44100.0F, 16, 2, true, false);
DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
TargetDataLine line = (TargetDataLine) AudioSystem.getLine(dataLineInfo);

or

AudioFormat audioFormat = new AudioFormat(44100.0F, 16, 2, true, false);
Mixer.Info[] minfoSet = AudioSystem.getMixerInfo();
Mixer mixer = AudioSystem.getMixer(minfoSet[0]);
DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
TargetDataLine line = (TargetDataLine)mixer.getLine(dataLineInfo);

but, i found this:

root@raspberrypi:~ # cat /proc/asound/cards
 0 [Headphones     ]: bcm2835_headphonbcm2835 Headphones - bcm2835 Headphones
                      bcm2835 Headphones
 1 [Camera         ]: USB-Audio - USB Camera
                      USB Camera USB Camera at usb-0000:01:00.0-1.4, high speed
root@raspberrypi:~ #

how can i use this USB Camera Audio?

Contributor guide

Research direction
Investigate why JavaSound cannot access the USB Camera audio device on Raspberry Pi 4B. Check ALSA configuration, ensure the USB audio device is default or accessible via Mixer API. Verify if javacv or FFmpeg can capture audio from the device directly.
Tech stack
java
Domain
api
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
JavaLinux audio basicsRaspberry Pi setup
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50