audio-lena [](http://github.com/badges/stability-badges)
March 19, 2026 · View on GitHub
Lena test audio fixture for audio decoders/encoders. The audio equivalent of the Lena test image.
Mono, 44100 Hz, ~12s. Noisy background, visible spectral peaks with harmonics, pitch variation. Good for codec testing, decoding, encoding, DSP, filtering.
| Parameter | Value |
|---|---|
samplesCount | 541184 |
duration | 12.27s |
numberOfChannels | 1 |
sampleRate | 44100 |
artist | Lena Stolze |
track | Oh lad le |
album | Das schreckliche Mädchen |
year | 2014 |
Formats
| Format | Size | MIME |
|---|---|---|
| wav | 1057 KB | audio/wav |
| mp3 | 193 KB | audio/mpeg |
| ogg | 109 KB | audio/ogg |
| flac | 473 KB | audio/flac |
| opus | 111 KB | audio/opus |
| aac | 108 KB | audio/aac |
| m4a | 243 KB | audio/mp4 |
| aiff | 1059 KB | audio/aiff |
| webm | 161 KB | audio/webm |
| caf | 1058 KB | audio/x-caf |
| raw | 2114 KB | float32 samples |
Usage
npm i audio-lena
// ArrayBuffer with encoded audio
import wav from 'audio-lena/wav'
import mp3 from 'audio-lena/mp3'
import flac from 'audio-lena/flac'
// Base64 string
import mp3Base64 from 'audio-lena/mp3-base64'
// Data URI
import oggDatauri from 'audio-lena/ogg-datauri'
let audio = new Audio(oggDatauri)
// Raw float32 samples
import raw from 'audio-lena/raw'
let samples = new Float32Array(raw)
// File URL (works in Node and browser)
import lena from 'audio-lena'
let url = lena.url('flac')
// Node: file path
import { fileURLToPath } from 'node:url'
let path = fileURLToPath(lena.url('flac'))
API
import lena from 'audio-lena'
Metadata and helpers.
| Property | Value |
|---|---|
lena.duration | 12.27 |
lena.samplesCount | 541184 |
lena.channels | 1 |
lena.numberOfChannels | 1 |
lena.sampleRate | 44100 |
lena.formats | ['wav', 'mp3', 'ogg', ...] |
lena.url(format) | URL to fixture file |
import buf from 'audio-lena/<format>'
Returns ArrayBuffer with encoded audio data.
Formats: wav, mp3, ogg, flac, opus, aac, m4a, aiff, webm, caf, raw.
import b64 from 'audio-lena/<format>-base64'
Returns base64-encoded string.
import uri from 'audio-lena/<format>-datauri'
Returns data-URI string (data:<mime>;base64,...).
Extra fixtures
Additional encoding variants are included for decoder compatibility testing. No JS modules — access via file path.
Root variants (encoded with ffmpeg/sox):
| File | Encoding |
|---|---|
lena-24.aiff | AIFF 24-bit PCM |
lena-32.aiff | AIFF 32-bit PCM |
lena-ulaw.aiff | AIFF µ-law |
lena-alaw.aiff | AIFF A-law |
lena-alaw.caf | CAF A-law |
lena-f32.caf | CAF 32-bit float |
lena-vorbis.webm | WebM Vorbis |
audacity/ (exported from Audacity):
| File | Encoding |
|---|---|
lena-24.aiff | AIFF 24-bit PCM |
lena-24-dwvw.aiff | AIFF 24-bit DWVW compressed |
lena-32.wav | WAV 32-bit float |
lena-64.aiff | AIFF 64-bit float |
lena-u.aiff | AIFF µ-law |
lena-a.aiff | AIFF A-law |
lena-gsm.aiff | AIFF GSM 6.10 compressed |
lena-ima-adpcm.aiff | AIFF IMA-ADPCM |
logic/ (exported from Logic Pro):
| File | Encoding |
|---|---|
lena-24.aif | AIFF 24-bit PCM |
lena-24.wav | WAV 24-bit PCM |
lena-32.aif | AIFF 32-bit float |
Same audio encoded by different tools — useful for testing decoder tolerance across encoder implementations.
Generating
To regenerate modules from binary fixtures:
node generate.js
To add a format, drop lena.<ext> into the root, add an entry to generate.js, and run it.