audio-lena

audio-lena

The Lena test audio. Returns ArrayBuffer with mp3 or wav of the record.

Appropriate for testing size (1Mb), length (~12s), noisy background, visible spectral peaks with harmonics, pitch variation, mono (not default number of channels). Good for sound recovery, sfx, filtering, decoding, encoding etc.

Parameter	Value
samplesCount	541184
duration	12.27s
numberOfChannels	1
sampleRate	44100
wav size	1.03 Mb
mp3 size	192.8 Kb
bitRate	705kbps
artist	Lena Stolze
track title	Oh lad le
album title	Das schreckliche Mädchen
year	2014

Usage

// MP3 arrayBuffer
const lenaBuffer = require('audio-lena/mp3');
const context = require('audio-context')();

context.decodeAudioData(lenaBuffer, (buffer) => {
	source = context.createBufferSource();
	source.buffer = buffer;
	source.connect(context.destination);
	source.loop = true;

	source.start();
})

// Decoded arrayBuffer with float32 samples data
const buf = require('audio-lena/raw');

let lenaSamples = new Float32Array(lenaBuf)
let buffer = context.createBuffer(1, lenaSamples.length, 44100)
buffer.getChannelData(0).set(lenaSamples)

let source = context.createBufferSource();
source.buffer = buffer;
source.connect(context.destination);
source.loop = false;

source.start();

// Data-uri
const ogg = require('audio-lena/ogg-datauri')

let audio = new Audio()
audio.addEventListener('canplay', () => {
	audio.play()
})
audio.src = ogg

API

let lena = require('audio-lena')

Entry	Meaning
audio-lena	Lena record constructor below.
audio-lena/raw	ArrayBuffer with float32 samples.
audio-lena/mp3	ArrayBuffer with encoded mp3 data.
audio-lena/wav	ArrayBuffer with encoded wav data.
audio-lena/ogg	ArrayBuffer with encoded ogg data.
audio-lena/flac	ArrayBuffer with encoded flac data.
audio-lena/raw-base64	Base64 string with encoded float32 samples.
audio-lena/mp3-base64	Base64 string with encoded mp3 data.
audio-lena/wav-base64	Base64 string with encoded wav data.
audio-lena/ogg-base64	Base64 string with encoded ogg data.
audio-lena/flac-base64	Base64 string with encoded flac data.
audio-lena/raw-datauri	Data-URI string with encoded float32 samples.
audio-lena/mp3-datauri	Data-URI string with encoded mp3 data.
audio-lena/wav-datauri	Data-URI string with encoded wav data.
audio-lena/ogg-datauri	Data-URI string with encoded ogg data.
audio-lena/flac-datauri	Data-URI string with encoded flac data.

let result = lena({format: 'mp3', type: 'float'}?)

Get lena record with defined format and type.

Format	Meaning
'mp3'	MP3-encoded data.
'wav'	WAV-encoded data.
'raw'	Raw float32 samples.
'ogg'	OGG-encoded samples.
'flac'	FLAC-encoded samples.

Type	Meaning
'buffer'	ArrayBuffer with data.
'base64'	Base64-encoded string.
'data-uri'	Data-uri string.

Reference

• Lenna in wiki.
• Lena.mp3 original.
• Lena test image.

Related

• slient-mp3-datauri