node-arecord
ALSA arecord wrapper for Node.js
This module was initially intended to provide basic audio capabilities in the Raspbian distribution of Debian on a Raspberry Pi platform. Node-arecord should however work on any Debian/Ubuntu system providing ALSA support has been installed.
ALSA stands for Advanced Linux Sound Architecture. It is a suite of hardware drivers, libraries and utilities which provide audio and MIDI functionality for the Linux operating system.
arecord is a simple native ALSA wav recorder.
Installation
Debian/Ubuntu/Raspbian
Get ready
Before we start the real work, please update the system.
sudo apt-get update
sudo apt-get upgrade
If you are running on Raspberry Pi, please update Raspbian
sudo rpi-update
Install ALSA for audio playback
sudo apt-get install alsa-base alsa-utils
USB Audio on Raspberry Pi
If you are planning on using a USB audio on Raspberry Pi you will need to set your USB audio device as the default device.
Edit /etc/modprobe.d/alsa-base.conf and replaced the line:
options snd-usb-audio index=-2
With the following lines:
options snd-usb-audio index=0 nrpacks=1
options snd-bcm2835 index=-2
After a reboot of your Raspberry Pi
aplay -l
Should output the following:
**** List of PLAYBACK Hardware Devices ****
card 0: XXXX [XXXX], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
Your device volume will be set to 0 by default. Use the ALSA mixer to adjust the volume using your arrow keys:
alsamixer
API
new Sound(options)
Start the process and save the stdout of ALSA arecord
tool to file
(Example : new Sound({destination_folder: '/tmp', 'filename:'filename.wav'}).record();
)
Example Usage
var Sound = ; var sound = debug: true // Show stdout destination_folder: '/tmp' filename: '/path/to/the/file/filename.wav' alsa_format: 'dat' alsa_device: 'plughw:1,0'; sound; ; ; ; // you can also listen for various callbacks:sound;