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