gnome-record-screen / GNOME-Record-Screen / src / ScreenRecorder.cs

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/**
 * ScreenRecorder.cs
 *
 * :copyright: 2008 mitsuhiko.
 * :license: BSD
 */

using System;
using System.IO;
using System.Text;
using System.Collections.Generic;
using System.Runtime.InteropServices;

using Gnome.RecordScreen;


namespace Gnome.RecordScreen {
	
	public class RecorderException : ApplicationException {
		
		public RecorderException (string message)
			: base (message)
		{}
	}
	
	public class RecordErrorEventArgs : EventArgs {
		private string error;
		
		public RecordErrorEventArgs (string error)
			: base ()
		{
			this.error = error;
		}
		
		public string Error {
			get { return error; }
		}
	}
	
	class GStreamerInterface : IDisposable {
		private IntPtr element = IntPtr.Zero;
		public delegate void MessageCallbackDelegate (IntPtr bus, IntPtr message);
		public delegate void FinishRecordDelegate ();
		public delegate void OnErrorDelegate (string error);
		private FinishRecordDelegate onFinish;
		private OnErrorDelegate onError;
		
		static GStreamerInterface ()
		{
			grc_initialize ();
		}
		
		public GStreamerInterface (ScreenRecorder recorder, FinishRecordDelegate onFinish,
		                           OnErrorDelegate onError)
		{
			element = grc_new_interface (recorder.Pipeline, OnMessageReceived);
			if (element == IntPtr.Zero)
				throw new RecorderException ("GStreamer was unable to initialize interface.");			
			this.onFinish = onFinish;
			this.onError = onError;
		}
		
		~GStreamerInterface ()
		{
			Dispose ();
		}
		
		public static bool SupportsObject (IGstObject obj)
		{
			return grc_test_pipeline (obj.GstKey);
		}
		
		public void Dispose ()
		{
			if (element != IntPtr.Zero) {
				grc_free_interface (element);
				element = IntPtr.Zero;
			}
		}
		
		public void Start ()
		{
			grc_interface_set_status (element, 1);
		}
		
		public void Stop ()
		{
			grc_interface_set_status (element, 0);
			FinishRecord ();
		}
		
		public void Kill ()
		{
			grc_interface_set_status (element, 0);
		}
		
		protected void OnMessageReceived (IntPtr bus, IntPtr message)
		{
			IntPtr error = IntPtr.Zero;
			bool finished = grc_message_is_eof (bus, message, out error);
			if (error != IntPtr.Zero) {
				string error_message = Marshal.PtrToStringAnsi (error);
				grc_free_message_error (error);
				onError (error_message);
			}
			if (finished)
				FinishRecord ();
		}
		
		protected void FinishRecord ()
		{
			if (onFinish != null) {
				FinishRecordDelegate func = onFinish;
				onFinish = null;
				func ();
			}
		}
		
#region Low-Level Interface to librecordscreen
		
		[DllImport ("librecordscreen")]
		private static extern void grc_initialize ();
		
		[DllImport ("librecordscreen")]
		private static extern IntPtr grc_new_interface (string pipeline, MessageCallbackDelegate cb);
		
		[DllImport ("librecordscreen")]
		private static extern IntPtr grc_free_interface (IntPtr element);
		
		[DllImport ("librecordscreen")]
		private static extern bool grc_test_pipeline (string pipeline);
		
		[DllImport ("librecordscreen")]
		private static extern bool grc_message_is_eof (IntPtr bus, IntPtr msg, out IntPtr error);
		
		[DllImport ("librecordscreen")]
		private static extern void grc_free_message_error (IntPtr error);
		
		[DllImport ("librecordscreen")]
		private static extern IntPtr grc_interface_set_status (IntPtr element, int status);
		
#endregion
	}
	
	/**
	 * This class provides a simple interface to the screen recorder
	 * via gstreamer.
	 */
	public class ScreenRecorder {		
		public delegate void RecordFinishedDelegate (object sender, EventArgs args);
		public event RecordFinishedDelegate RecordFinished;
		
		public delegate void ErrorOccurredDelegate (object sender, RecordErrorEventArgs args);
		public event ErrorOccurredDelegate ErrorOccurred;
		
		private GStreamerInterface gst;
		private bool recording;
		private bool exhausted;
		private bool recordAudio;
		private bool hideMousePointer;
		private string videoEncoderArguments;
		private string audioEncoderArguments;
		public int outputWidth = -1;
		public int outputHeight = -1;
		
		private VideoEncoder videoEncoder;
		private Gdk.Rectangle rectangle;
		private double framerate = 15.0;
		private string[] createdTemporaryFiles;
		
		private string temporaryFilename;
		
		public ScreenRecorder (VideoEncoder videoEncoder) :
			this (videoEncoder, Gdk.Rectangle.Zero)
		{
		}
		
		public ScreenRecorder (VideoEncoder videoEncoder, Gdk.Rectangle rectangle)
		{
			this.videoEncoder = videoEncoder;
			this.rectangle = Rectangle;
		}
		
		/**
		 * Returns the active gst interface.
		 */
		private GStreamerInterface Gst {
			get {
				if (gst == null)
					gst = new GStreamerInterface (this, delegate () {
						RecordFinished (this, new EventArgs ());
					}, delegate (string error) {
						ErrorOccurred (this, new RecordErrorEventArgs (error));
					});
				return gst;
			}
		}
		
		/**
		 * Method that checks that the interface is not yet initialized.
		 */
		private void AssertUninitialized ()
		{
			if (IsInitialized)
				throw new MemberAccessException ("Can't set attribute if interface " +
				                                 "is initialized");
		}
		
		/**
		 * Starts the record process.
		 */
		public void Record ()
		{
			if (IsExhausted)
				throw new Exception ("Recorder is exhausted.");
			recording = true;
			Gst.Start ();
		}
		
		/**
		 * Stops the record process.
		 */
		public void Stop ()
		{
			if (!recording)
				return;
			exhausted = true;
			recording = false;
			Gst.Stop ();
		}
		
		/**
		 * Kills the recorder and cleans up.
		 */
		public void Kill ()
		{
			exhausted = true;
			recording = false;
			Gst.Kill ();
			DeleteTemporaryFiles ();
		}
		
		/**
		 * Delete all created temporary files.
		 */
		public void DeleteTemporaryFiles ()
		{
			foreach (string filename in CreatedTemporaryFiles)
				if (File.Exists (filename))
					File.Delete (filename);
		}
		
		/**
		 * true if the recorder is currently recording.
		 */
		public bool IsRecording {
			get { return recording; }
		}
		
		/**
		 * true if the recorder is exhausted.
		 */
		public bool IsExhausted {
			get { return exhausted; }
		}
		
		/**
		 * true if the recorder is already initialized.  If that's the
		 * case no modifications on the record affecting properties are
		 * allowed.
		 * 
		 * This is usually the case after recording started.
		 */
		public bool IsInitialized {
			get { return gst != null; }
		}
		
		/**
		 * true if the full screen is captured.
		 */
		public bool FullscreenCapture {
			get { return rectangle == Gdk.Rectangle.Zero; }
			set {
				AssertUninitialized ();
				if (!value)
					throw new ArgumentException ("To disable fullscreen " +
					                             "capture assign a rectangle.");
				rectangle = Gdk.Rectangle.Zero;
			}
		}
		
		/**
		 * true if the mouse pointer should be hidden.
		 */
		public bool HideMousePointer {
			get { return hideMousePointer; }
			set {
				AssertUninitialized ();
				hideMousePointer = value;
			}
		}
		
		public Gdk.Rectangle Rectangle {
			get { return rectangle; }
			set {
				AssertUninitialized ();
				rectangle = value;
			}
		}
		
		public double Framerate {
			get { return framerate; }
			set {
				AssertUninitialized ();
				framerate = value;
			}
		}
		
		public int OutputWidth {
			get { return outputWidth; }
			set {
				AssertUninitialized ();
				outputWidth = value;
			}
		}
		
		public int OutputHeight {
			get { return outputHeight; }
			set {
				AssertUninitialized ();
				outputHeight = value;
			}
		}
		
		public bool ResizeOutput {
			get { return OutputWidth >= 0 && OutputHeight >= 0; }
		}
		
		public string VideoEncoderArguments {
			get { return videoEncoderArguments; }
			set {
				AssertUninitialized ();
				videoEncoderArguments = (value == "") ? null : value;
			}
		}
		
		public string AudioEncoderArguments {
			get { return audioEncoderArguments; }
			set {
				AssertUninitialized ();
				audioEncoderArguments = (value == "") ? null : value;
			}
		}
		
		public bool RecordAudio {
			get { return recordAudio; }
			set {
				AssertUninitialized ();
				recordAudio = value;
			}
		}
		
		public AudioEncoder AudioEncoder {
			get { return VideoEncoder.Container.AudioCodec; }
		}
		
		public string Pipeline {
			get {
				if (RecordAudio)
					return String.Format ("{0} ! {1} ! {2} ! queue ! mux. {3} ! queue ! mux.",
					                      ContainerPipeline, VideoCapturePipeline,
					                      VideoEncodePipeline, AudioPipeline);
				return String.Format ("{0} ! queue ! {1} ! {2}", VideoCapturePipeline,
				                      VideoEncodePipeline, ContainerPipeline);
			}
		}
		
		public string VideoEncodePipeline {
			get {
				string result = VideoEncoder.GstKey;
				if (VideoEncoderArguments != null)
					result += " " + VideoEncoderArguments;
				
				if (ResizeOutput)
					result = String.Format ("video/x-raw-rgb,width={0},height={1} ! {2}",
					                        OutputWidth, OutputHeight, result);
				
				return result;
			}
		}
		
		public string ContainerPipeline {
			get {
				string result = "";
				if (VideoEncoder.Container.GstKey != null)
					result += VideoEncoder.Container.GstKey + " name=mux ! ";
				if (VideoEncoder.Container.RequiresMultiFileSink)
					result += "multifilesink location=\"" + TemporaryFilename + "-%06d\"";
				else
					result += "filesink location=\"" + TemporaryFilename + "\"";
				return result;
			}
		}
		
		public string VideoCapturePipeline {
			get {
				StringBuilder b = new StringBuilder ("ximagesrc");
				
				// offsets and dimensions if given
				if (!FullscreenCapture) {
					b.Append (" startx=" + Rectangle.X + " starty=" + Rectangle.Y);
					b.Append (" endx=" + (Rectangle.X + Rectangle.Width));
					b.Append (" endy=" + (Rectangle.Y + Rectangle.Height));
				}
				
				// disable mouse pointer if wanted
				if (HideMousePointer)
					b.Append(" show-pointer=false");				
				
				// Video Format
				b.Append (" ! video/x-raw-rgb,framerate=" + Framerate + "/1");
				
				// Regular processing
				b.Append (" ! videorate ! ffmpegcolorspace");
				
				return b.ToString ();
			}
		}
		
		public string AudioPipeline {
			get {
				// XXX: switch from gconfaudiosrc to the selection from
				// the configuration panel.
				string result = "gconfaudiosrc ! audioconvert ! " +
					AudioEncoder.GstKey;
				if (AudioEncoderArguments != null)
					result += " " + AudioEncoderArguments;
				return result;
			}
		}
		
		public string TemporaryFilename {
			get {
				if (temporaryFilename == null)
					temporaryFilename = System.IO.Path.GetTempFileName ();
				return temporaryFilename;
			}
		}
		
		public string[] CreatedTemporaryFiles {
			get {
				if (createdTemporaryFiles == null) {
					if (!VideoEncoder.Container.RequiresMultiFileSink)
						createdTemporaryFiles = new string[] { TemporaryFilename };
					else {
						createdTemporaryFiles =
							Utils.FindPrefixedFiles (TemporaryFilename + "-");
						Array.Sort (createdTemporaryFiles);
					}
				}
				return createdTemporaryFiles;
			}
		}
		
		public VideoEncoder VideoEncoder {
			get { return videoEncoder; }
			set {
				AssertUninitialized ();
				videoEncoder = value;
			}
		}
	}
}
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