# Screen capture to MP4 file

using System;
using System.IO;
using System.Windows.Forms;
using VisioForge.Core.VideoCapture;
using VisioForge.Core.Types;
using VisioForge.Core.Types.Output;
using VisioForge.Core.Types.VideoCapture;

namespace screen_capture_mp4
{
    public partial class Form1 : Form
    {
        // Main VideoCapture component that handles all recording operations
        private VideoCaptureCore videoCapture1;

        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Starts screen recording with audio from the default device
        /// </summary>
        private async void btStartWithAudio_Click(object sender, EventArgs e)
        {
            // Configure screen capture to record the entire screen
            // ScreenCaptureSourceSettings allows fine control of capture region and parameters
            videoCapture1.Screen_Capture_Source = new ScreenCaptureSourceSettings() { 
                FullScreen = true  // Capture the entire screen rather than a specific region
            };

            // Configure audio capture by selecting the first available audio input device
            // Audio_CaptureDevices() returns all connected microphones and audio inputs
            // We select the first device (index 0) in the collection
            videoCapture1.Audio_CaptureDevice = new AudioCaptureSource(
                videoCapture1.Audio_CaptureDevices()[0].Name);

            // Disable audio monitoring/playback during recording to prevent feedback
            // This means we won't hear the captured audio while recording
            videoCapture1.Audio_PlayAudio = false;

            // Enable audio recording to include sound in the output file
            videoCapture1.Audio_RecordAudio = true;

            // Set the output file location to the user's Videos folder
            // Environment.GetFolderPath ensures the path works across different Windows systems
            videoCapture1.Output_Filename = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.MyVideos), 
                "output.mp4");
            
            // Use MP4 container format with H.264 video and AAC audio codecs (standard format)
            // MP4Output can be further configured with custom encoding parameters if needed
            videoCapture1.Output_Format = new MP4Output();
            
            // Set the capture mode to screen recording
            // Other modes include camera capture, video file processing, etc.
            videoCapture1.Mode = VideoCaptureMode.ScreenCapture;

            // Begin the capture process asynchronously
            // Using async/await pattern to prevent UI freezing during operation
            await videoCapture1.StartAsync();
        }

        /// <summary>
        /// Starts screen recording without audio (video only)
        /// </summary>
        private async void btStartWithoutAudio_Click(object sender, EventArgs e)
        {
            // Configure screen capture for full screen recording
            // Same ScreenCaptureSourceSettings as in audio recording
            videoCapture1.Screen_Capture_Source = new ScreenCaptureSourceSettings() { 
                FullScreen = true 
            };

            // Disable both audio playback and recording in a single line
            // This creates a video-only MP4 file with no audio track
            videoCapture1.Audio_PlayAudio = videoCapture1.Audio_RecordAudio = false;

            // Set output file path to user's Videos directory with MP4 extension
            videoCapture1.Output_Filename = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.MyVideos), 
                "output.mp4");
            
            // Configure output as MP4 (H.264 video codec)
            videoCapture1.Output_Format = new MP4Output();
            
            // Set mode to screen capture
            videoCapture1.Mode = VideoCaptureMode.ScreenCapture;

            // Start screen recording asynchronously
            await videoCapture1.StartAsync();
        }

        /// <summary>
        /// Stops the current recording process safely
        /// </summary>
        private async void btStop_Click(object sender, EventArgs e)
        {
            // Stop the recording asynchronously
            // This properly finalizes the MP4 file and releases resources
            // Using async ensures UI remains responsive during file finalization
            await videoCapture1.StopAsync();
        }

        /// <summary>
        /// Initializes the VideoCapture component when the form loads
        /// </summary>
        private void Form1_Load(object sender, EventArgs e)
        {
            // Initialize the video capture component and connect it to a video preview control
            // VideoView1 should be a control on your form that implements IVideoView interface
            // This allows for live preview of the capture when desired
            videoCapture1 = new VideoCaptureCore(VideoView1 as IVideoView);
        }
    }
}