const { spawn } = require('child_process');
const fs = require('fs');

// Define your FFmpeg command and arguments
const ffmpegCommand = 'ffmpeg';
const args = [
    '-f', 'mulaw',
    '-ar', '8000',
    '-ac', '1',
    '-i', 'pipe:0',  // Use stdin as input
    '-ar', '8000',
    '-ac', '1',
    '-acodec', 'pcm_s16le',
    '-f', 'wav',
    'pipe:1'  // Use stdout as output
];

// Spawn the FFmpeg process
const ffmpeg = spawn(ffmpegCommand, args);

// Prepare the input stream (for example, reading from a file)
const inputStream = fs.createReadStream('input.raw');

// Pipe the input file into FFmpeg's stdin
inputStream.pipe(ffmpeg.stdin);

// Handle the output stream
ffmpeg.stdout.on('data', (data) => {
    // Handle the data from FFmpeg's stdout
    console.log('Data from FFmpeg:', data);
});

// Handle errors
ffmpeg.stderr.on('data', (data) => {
    console.error('Error from FFmpeg:', data.toString());
});

ffmpeg.on('close', (code) => {
    console.log(`FFmpeg process exited with code ${code}`);
});