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web/libav: add ffprobe wrapper

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This commit is contained in:
dumbmoron
2024-08-13 15:33:30 +00:00
parent 4636f7b0d4
commit f93d84c457
3 changed files with 51 additions and 0 deletions
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1
web/package.json
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@ -30,6 +30,7 @@
"@sveltejs/kit": "^2.0.0",
"@sveltejs/vite-plugin-svelte": "^3.0.0",
"@types/eslint__js": "^8.42.3",
"@types/fluent-ffmpeg": "^2.1.25",
"@types/node": "^20.14.10",
"compare-versions": "^6.1.0",
"eslint": "^8.57.0",

40
web/src/lib/libav.ts
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@ -1,6 +1,7 @@
import mime from "mime";
import LibAV, { type LibAV as LibAVInstance } from "@imput/libav.js-remux-cli";
import type { FFmpegProgressCallback, FFmpegProgressEvent, FFmpegProgressStatus, FileInfo, RenderParams } from "./types/libav";
import type { FfprobeData } from "fluent-ffmpeg";
export default class LibAVWrapper {
libav: Promise<LibAVInstance> | null;
@ -22,6 +23,45 @@ export default class LibAVWrapper {
}
}
async probe(blob: Blob) {
if (!this.libav) throw new Error("LibAV wasn't initialized");
const libav = await this.libav;
const OUT_FILE = 'output.json';
await libav.mkreadaheadfile('input', blob);
await libav.mkwriterdev(OUT_FILE);
let writtenData = new Uint8Array(0);
libav.onwrite = (name, pos, data) => {
if (name !== OUT_FILE) return;
const newLen = Math.max(pos + data.length, writtenData.length);
if (newLen > writtenData.length) {
const newData = new Uint8Array(newLen);
newData.set(writtenData);
writtenData = newData;
}
writtenData.set(data, pos);
};
await libav.ffprobe([
'-v', 'quiet',
'-print_format', 'json',
'-show_format',
'-show_streams',
'input',
'-o', OUT_FILE
]);
await libav.unlink(OUT_FILE);
await libav.unlinkreadaheadfile('input');
const copy = new Uint8Array(writtenData);
const text = new TextDecoder().decode(copy);
return JSON.parse(text) as FfprobeData;
}
async render({ blob, output, args }: RenderParams) {
if (!this.libav) throw new Error("LibAV wasn't initialized");
const libav = await this.libav;