feat: introduce audio merging and trimming tools with support for multiple formats

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

@@ -0,0 +1,94 @@
+import { FFmpeg } from '@ffmpeg/ffmpeg';
+import { fetchFile } from '@ffmpeg/util';
+import { InitialValuesType } from './types';
+
+const ffmpeg = new FFmpeg();
+
+export async function mergeAudioFiles(
+  inputs: 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'
+    });
+  }
+
+  if (inputs.length === 0) {
+    throw new Error('No input files provided');
+  }
+
+  const { outputFormat } = options;
+  const outputName = `output.${outputFormat}`;
+
+  // Write all input files to FFmpeg
+  const inputNames: string[] = [];
+  for (let i = 0; i < inputs.length; i++) {
+    const inputName = `input${i}.mp3`;
+    await ffmpeg.writeFile(inputName, await fetchFile(inputs[i]));
+    inputNames.push(inputName);
+  }
+
+  // Create a file list for concatenation
+  const fileListName = 'filelist.txt';
+  const fileListContent = inputNames.map((name) => `file '${name}'`).join('\n');
+  await ffmpeg.writeFile(fileListName, fileListContent);
+
+  // Build FFmpeg arguments for merging
+  let args: string[] = ['-f', 'concat', '-safe', '0', '-i', fileListName];
+
+  // Add format-specific arguments
+  if (outputFormat === 'mp3') {
+    args.push(
+      '-ar',
+      '44100',
+      '-ac',
+      '2',
+      '-b:a',
+      '192k',
+      '-f',
+      'mp3',
+      outputName
+    );
+  } else if (outputFormat === 'aac') {
+    args.push('-c:a', 'aac', '-b:a', '192k', '-f', 'adts', outputName);
+  } else if (outputFormat === 'wav') {
+    args.push(
+      '-acodec',
+      'pcm_s16le',
+      '-ar',
+      '44100',
+      '-ac',
+      '2',
+      '-f',
+      'wav',
+      outputName
+    );
+  }
+
+  await ffmpeg.exec(args);
+
+  const mergedAudio = await ffmpeg.readFile(outputName);
+
+  let mimeType = 'audio/mp3';
+  if (outputFormat === 'aac') mimeType = 'audio/aac';
+  if (outputFormat === 'wav') mimeType = 'audio/wav';
+
+  // Clean up files
+  for (const inputName of inputNames) {
+    await ffmpeg.deleteFile(inputName);
+  }
+  await ffmpeg.deleteFile(fileListName);
+  await ffmpeg.deleteFile(outputName);
+
+  return new File(
+    [
+      new Blob([mergedAudio], {
+        type: mimeType
+      })
+    ],
+    `merged_audio.${outputFormat}`,
+    { type: mimeType }
+  );
+}