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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| import { fileTypeFromBuffer } from "file-type" | ||
| import { PassThrough } from "stream" | ||
| import { logVerbose } from "./util" | ||
| import { writeFile } from "fs/promises" | ||
| import { Readable } from "stream" | ||
|
|
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| async function importFfmpeg() { | ||
| const ffmpeg = await import("fluent-ffmpeg") | ||
| return ffmpeg.default | ||
| } | ||
|
|
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| export async function convertToAudioBlob(data: Buffer): Promise<Blob> { | ||
| const mime = await fileTypeFromBuffer(data) | ||
| if (/^audio\//.test(mime?.mime)) | ||
| return new Blob([data], { type: mime.mime }) | ||
|
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| logVerbose(`ffmpeg: extracting audio from video...`) | ||
| return new Promise<Blob>(async (resolve, reject) => { | ||
| const inputStream = new PassThrough() | ||
| inputStream.end(data) | ||
| await writeFile("input.mp4", data) | ||
|
|
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| console.log(await fileTypeFromBuffer(data)) | ||
| const outputStream = new PassThrough() | ||
| const chunks: Buffer[] = [] | ||
|
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| outputStream.on("data", (chunk) => chunks.push(chunk)) | ||
| outputStream.on("end", async () => { | ||
| const buffer = Buffer.concat(chunks) | ||
| const mime = await fileTypeFromBuffer(buffer) | ||
| await writeFile("audio.wav", buffer) | ||
| resolve(new Blob([buffer], { type: mime.mime })) | ||
| }) | ||
| outputStream.on("error", reject) | ||
|
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||
| const ffmpeg = await importFfmpeg() | ||
| ffmpeg(inputStream) | ||
| .toFormat("wav") | ||
| .audioBitrate("16k") | ||
| .on("error", reject) | ||
| .pipe(outputStream) | ||
| }) | ||
| } |
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