Vocal & Instrument Stem Separation

// Next.js App Router Webhook Receiver (/api/webhook/suno/route.ts)
import { NextRequest, NextResponse } from 'next/server';

export async function POST(req: NextRequest) {
  const payload = await req.json();
  const { code, msg, data } = payload;

  if (code === 200 && data?.vocal_removal_info) {
    const info = data.vocal_removal_info;
    console.log(`Stem separation task ${data.task_id} completed successfully!`);
    console.log(`Isolated Vocals URL: ${info.vocal_url}`);
    console.log(`Instrumental Track URL: ${info.instrumental_url}`);

    // If multi-stem mode (split_stem) was used:
    if (Array.isArray(info.origin_data)) {
      info.origin_data.forEach((stem: any) => {
        console.log(`Stem ${stem.stem_type_group_name}: ${stem.audio_url} (${stem.duration}s)`);
      });
    }

    // Persist stem URLs to database, notify client, or trigger downstream audio rendering
  } else {
    console.error(`Stem separation failed (${code}): ${msg}`);
  }

  return NextResponse.json({ received: true });
}