const child_process = require('child_process');

// Requirements:
// gstreamer: gst-launch-1.0
// ffmpeg: ffmpeg

// gstreamer = audio recording
// see `pacmd list` for audio sources
// -v for verbose output
// $ gst-launch-1.0 -v pulsesrc device = "alsa_output.pci-0000_00_1f.3.analog-stereo.monitor" ! wavenc ! filesink location="output.wav"
function start_recording() {
    let device = 'alsa_output.pci-0000_00_1f.3.analog-stereo.monitor';
    let output = 'output.wav';
    let recording_process = child_process.spawn(
        'gst-launch-1.0', [ '-v', 'pulsesrc', 'device', '=', device, '!', 'wavenc', '!', 'filesink', 'location', '=', output ]
    );
    return recording_process;
}

async function stop_recording() {
    
}

// ffmpeg = file conversion (wav -> mp3)
// $ ffmpeg -i output.wav -b:a 192k output.mp3
// metadata can be added as follows
// $ ffmpeg -i output.wav \
//       -metadata title="Song Name" \
//       -metadata author="Song Artist" \
//       -metadata album="Song Album" \
//       -b:a 192k output.mp3