31 lines
1 KiB
TypeScript
31 lines
1 KiB
TypeScript
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import { Bytes, write } from '@fuman/io'
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import { $ } from 'zx'
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export async function generateOpusImageBlob(image: Uint8Array) {
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// todo we should probably not use ffprobe here but whatever lol
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const proc = $`ffprobe -of json -v error -show_entries stream=codec_name,width,height pipe:0`
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proc.stdin.write(image)
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proc.stdin.end()
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const json = await proc.json()
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const img = json.streams[0]
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// https://www.rfc-editor.org/rfc/rfc9639.html#section-8.8
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const mime = img.codec_name === 'mjpeg' ? 'image/jpeg' : 'image/png'
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const description = 'Cover Artwork'
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const res = Bytes.alloc(image.length + 128)
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write.uint32be(res, 3) // picture type = album cover
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write.uint32be(res, mime.length)
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write.rawString(res, mime)
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write.uint32be(res, description.length)
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write.rawString(res, description)
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write.uint32be(res, img.width)
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write.uint32be(res, img.height)
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write.uint32be(res, 0) // color depth
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write.uint32be(res, 0) // color index (unused, for gifs)
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write.uint32be(res, image.length)
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write.bytes(res, image)
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return res.result()
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}
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