Audio Separation Callbacks

const express = require('express');
const app = express();

app.use(express.json());

app.post('/suno-vocal-separation-callback', (req, res) => {
  const { code, msg, data } = req.body;
  
  console.log('Received vocal separation callback:', {
    taskId: data.task_id,
    status: code,
    message: msg
  });
  
  if (code === 200) {
    // Task completed successfully
    console.log('Vocal separation completed');
    const vocalInfo = data.vocal_separation_info;
    
    if (vocalInfo) {
      console.log('Separation results:');
      console.log(`Original audio: ${vocalInfo.origin_url}`);
      console.log(`Vocal part: ${vocalInfo.vocal_url}`);
      
      // separate_vocal type specific fields
      if (vocalInfo.instrumental_url) {
        console.log(`Instrumental part: ${vocalInfo.instrumental_url}`);
      }
      
      // split_stem type specific fields
      if (vocalInfo.backing_vocals_url) {
        console.log(`Backing vocals: ${vocalInfo.backing_vocals_url}`);
        console.log(`Drums part: ${vocalInfo.drums_url}`);
        console.log(`Bass part: ${vocalInfo.bass_url}`);
        console.log(`Guitar part: ${vocalInfo.guitar_url}`);
        console.log(`Keyboard part: ${vocalInfo.keyboard_url}`);
        console.log(`Percussion part: ${vocalInfo.percussion_url}`);
        console.log(`Strings part: ${vocalInfo.strings_url}`);
        console.log(`Synthesizer part: ${vocalInfo.synth_url}`);
        console.log(`Effects part: ${vocalInfo.fx_url}`);
        console.log(`Brass part: ${vocalInfo.brass_url}`);
        console.log(`Woodwinds part: ${vocalInfo.woodwinds_url}`);
      }
      
      // Process separated audio files
      // Can download files, save locally, etc.
    }
    
  } else {
    // Task failed
    console.log('Vocal separation failed:', msg);
    
    // Handle failure scenarios...
  }
  
  // Return 200 status code to confirm callback received
  res.status(200).json({ status: 'received' });
});

app.listen(3000, () => {
  console.log('Callback server running on port 3000');
});