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Well tested WASM (WebAssembly) in-memory encoder/decoder mp3/ogg/opus/vorbis from/to Float32Array based on @flemist/ffmpeg.wasm-st

I think this should work in the browser, but I haven't tested.

``ts
import {
ffmpegDecode,
ffmpegEncode,
AudioSamples,
ffmpegEncodeVorbisParams,
ffmpegEncodeMp3Params,
ffmpegEncodeOpusParams,
getFFmpeg,
} from '@flemist/ffmpeg-encode-decode'

// Optional: preload ffmpeg library and enable logger
getFFmpeg({
log : true,
logger: ({message}) => console.log(message),
})

export async function example() {
const samples: AudioSamples = {
data : new Float32Array(16000 2 7), // 7 seconds of silence
sampleRate: 16000,
channels : 2,
}

// encode mp3
const mp3Data: Uint8Array = await ffmpegEncode(samples, {
outputFormat: 'mp3', // same as file extension
channels : 1, // auto convert to mono
// docs: http://ffmpeg.org/ffmpeg-codecs.html#libmp3lame
params : ffmpegEncodeMp3Params({
bitrate : 64,
mode : 'abr',
jointStereo: true,
}),
})

// encode ogg vorbis
const oggVorbisData: Uint8Array = await ffmpegEncode(samples, {
outputFormat: 'ogg', // same as file extension
channels : 1, // auto convert to mono
// docs: http://ffmpeg.org/ffmpeg-codecs.html#libvorbis
params : ffmpegEncodeVorbisParams({
vbr : true,
vbrQuality: 3,
}),
})

// encode ogg opus
// !! Attention opus encoder heavily distorts samples data
const oggOpusData: Uint8Array = await ffmpegEncode(samples, {
outputFormat: 'opus', // same as file extension
channels : 1, // auto convert to mono
// docs: http://ffmpeg.org/ffmpeg-codecs.html#libopus-1
params : ffmpegEncodeOpusParams({
bitrate : 32,
vbr : 'on',
frameDuration: 40,
}),
})

// Auto recognize/detect/determine and decode any audio formats that supports in @flemist/ffmpeg.wasm-st library:

const mp3Samples: AudioSamples = await ffmpegDecode(mp3Data, {
channels : 2, // auto convert mono to stereo (notice - this will turn the volume down to 60%)
sampleRate: 32000, // auto convert sampleRate
})

const oggVorbisSamples: AudioSamples = await ffmpegDecode(oggVorbisData, {
channels : 2, // auto convert mono to stereo (notice - this will turn the volume down to 60%)
sampleRate: 32000, // auto convert sampleRate
})

const oggOpusSamples: AudioSamples = await ffmpegDecode(oggOpusData, {
channels : 2, // auto convert mono to stereo (notice - this will turn the volume down to 60%)
sampleRate: 32000, // auto convert sampleRate
})
}
``

License

Unlimited Free

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