feat: add audio extraction tool to convert video files to audio formats (AAC, MP3, WAV)

src/pages/tools/audio/extract-audio/service.ts

@@ -0,0 +1,70 @@
+import { FFmpeg } from '@ffmpeg/ffmpeg';
+import { fetchFile } from '@ffmpeg/util';
+import { InitialValuesType } from './types';
+
+const ffmpeg = new FFmpeg();
+
+export async function extractAudioFromVideo(
+  input: File,
+  options: InitialValuesType
+): Promise<File> {
+  if (!ffmpeg.loaded) {
+    await ffmpeg.load({
+      wasmURL:
+        'https://cdn.jsdelivr.net/npm/@ffmpeg/core@0.12.9/dist/esm/ffmpeg-core.wasm'
+    });
+  }
+
+  const inputName = 'input.mp4';
+  await ffmpeg.writeFile(inputName, await fetchFile(input));
+
+  const configuredOutputAudioFormat = options.outputFormat;
+  const outputName = `output.${configuredOutputAudioFormat}`;
+  let args: string[] = ['-i', inputName, '-vn'];
+
+  if (configuredOutputAudioFormat === 'mp3') {
+    args.push(
+      '-ar',
+      '44100',
+      '-ac',
+      '2',
+      '-b:a',
+      '192k',
+      '-f',
+      'mp3',
+      outputName
+    );
+  } else if (configuredOutputAudioFormat === 'wav') {
+    args.push(
+      '-acodec',
+      'pcm_s16le',
+      '-ar',
+      '44100',
+      '-ac',
+      '2',
+      '-f',
+      'wav',
+      outputName
+    );
+  } else {
+    // Default to AAC or copy
+    args.push('-acodec', 'copy', outputName);
+  }
+
+  await ffmpeg.exec(args);
+
+  const extractedAudio = await ffmpeg.readFile(outputName);
+
+  return new File(
+    [
+      new Blob([extractedAudio], {
+        type: `audio/${configuredOutputAudioFormat}`
+      })
+    ],
+    `${input.name.replace(
+      /\.[^/.]+$/,
+      ''
+    )}_audio.${configuredOutputAudioFormat}`,
+    { type: `audio/${configuredOutputAudioFormat}` }
+  );
+}