First Commit

externals/soundtouch/source/csharp-example/MainWindow.xaml.cs

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+//////////////////////////////////////////////////////////////////////////////
+///
+/// C# example that manipulates mp3 audio files with SoundTouch library.
+/// 
+/// Author        : Copyright (c) Olli Parviainen
+/// Author e-mail : oparviai 'at' iki.fi
+/// SoundTouch WWW: http://www.surina.net/soundtouch
+///
+////////////////////////////////////////////////////////////////////////////////
+//
+// License for this source code file: Microsoft Public License(Ms-PL)
+//
+////////////////////////////////////////////////////////////////////////////////
+
+using soundtouch;
+using System;
+using System.IO;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+
+namespace csharp_example
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        protected SoundProcessor processor = new SoundProcessor();
+
+        public MainWindow()
+        {
+            InitializeComponent();
+
+            StatusMessage.statusEvent += StatusEventHandler;
+            processor.PlaybackStopped += EventHandler_playbackStopped;
+            DisplaySoundTouchVersion();
+        }
+
+
+        /// <summary>
+        /// Display SoundTouch library version string in status bar. This also indicates whether the DLL was loaded successfully or not ...
+        /// </summary>
+        private void DisplaySoundTouchVersion()
+        {
+            string status;
+            try
+            {
+                status = String.Format("SoundTouch version: {0}", SoundTouch.Version);
+            }
+            catch (Exception exp)
+            {
+                status = exp.Message;
+            }
+            text_status.Text = status;
+        }
+
+
+        private void StatusEventHandler(object sender, string msg)
+        {
+            text_status.Text = msg;
+        }
+
+
+        // Open mp3 file for playback
+        private void OpenFile(string fileName)
+        {
+            Stop();
+            if (processor.OpenMp3File(fileName) == true)
+            {
+                textBox_filename.Text = fileName;
+                button_play.IsEnabled = true;
+                button_stop.IsEnabled = true;
+
+                // Parse adjustment settings
+                ParseTempoTextBox();
+                ParsePitchTextBox();
+                ParseRateTextBox();
+            }
+            else
+            {
+                textBox_filename.Text = "";
+                button_play.IsEnabled = false;
+                button_stop.IsEnabled = false;
+                MessageBox.Show("Coudln't open audio file " + fileName);
+            }
+        }
+
+
+        private void button_browse_Click(object sender, RoutedEventArgs e)
+        {
+            // Show file selection dialog
+            Microsoft.Win32.OpenFileDialog openDialog = new Microsoft.Win32.OpenFileDialog();
+            if (string.IsNullOrEmpty(textBox_filename.Text) == false)
+            {
+                // if an audio file is open, set directory to same as with the file
+                openDialog.InitialDirectory = Path.GetDirectoryName(textBox_filename.Text);
+            }
+            openDialog.Filter = "MP3 files (*.mp3)|*.mp3";
+            if (openDialog.ShowDialog() == true)
+            {
+                OpenFile(openDialog.FileName);
+            }
+        }
+
+
+        private void setPlayButtonMode(bool play)
+        {
+            button_play.Content = play ? "_Play" : "_Pause";
+        }
+
+
+        private void EventHandler_playbackStopped(object sender, bool hasReachedEnd)
+        {
+            if (hasReachedEnd)
+            {
+                text_status.Text = "Stopped";
+            }   // otherwise paused
+
+            setPlayButtonMode(true);
+        }
+
+
+        private void button_play_Click(object sender, RoutedEventArgs e)
+        {
+            if ((string)button_play.Content == "_Pause")
+            {
+                // Pause
+                if (processor.Pause())
+                {
+                    text_status.Text = "Paused";
+                }
+                setPlayButtonMode(true);
+            }
+            else
+            {
+                // Play
+                if (processor.Play())
+                {
+                    text_status.Text = "Playing";
+                    setPlayButtonMode(false);
+                }
+            }
+        }
+
+
+        private void Stop()
+        {
+            if (processor.Stop())
+            {
+                text_status.Text = "Stopped";
+            }
+            setPlayButtonMode(true);
+        }
+
+
+        private void button_stop_Click(object sender, RoutedEventArgs e)
+        {
+            Stop();
+        }
+
+
+        private bool parse_percentValue(TextBox box, out double value)
+        {
+            if (double.TryParse(box.Text, out value) == false) return false;
+            if (value < -99.0) value = -99.0;   // don't allow more than -100% slowdown ... :)
+            box.Text = value.ToString();
+            return true;
+        }
+
+
+        private void ParsePitchTextBox()
+        {
+            double pitchValue;
+            if (double.TryParse(textBox_pitch.Text, out pitchValue))
+            {
+                if (processor.streamProcessor != null) processor.streamProcessor.st.PitchSemiTones = (float)pitchValue;
+            }
+        }
+
+
+        private void ParseTempoTextBox()
+        {
+            double tempoValue;
+            if (parse_percentValue(textBox_tempo, out tempoValue))
+            {
+                if (processor.streamProcessor != null) processor.streamProcessor.st.TempoChange = (float)tempoValue;
+            }
+        }
+
+
+        private void ParseRateTextBox()
+        {
+            double rateValue;
+            if (parse_percentValue(textBox_rate, out rateValue))
+            {
+                if (processor.streamProcessor != null) processor.streamProcessor.st.RateChange = (float)rateValue;
+            }
+        }
+
+
+        private void textBox_tempo_LostFocus(object sender, RoutedEventArgs e)
+        {
+            ParseTempoTextBox();
+        }
+
+
+        private void textBox_tempo_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Enter)
+            {
+                // enter pressed -- parse value
+                ParseTempoTextBox();
+            }
+        }
+
+
+        private void textBox_pitch_LostFocus(object sender, RoutedEventArgs e)
+        {
+            ParsePitchTextBox();
+        }
+
+
+        private void textBox_pitch_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Enter)
+            {
+                // enter pressed -- parse value
+                ParsePitchTextBox();
+            }
+        }
+
+
+        private void textBox_rate_LostFocus(object sender, RoutedEventArgs e)
+        {
+            ParseRateTextBox();
+        }
+
+
+        private void textBox_rate_KeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Enter)
+            {
+                // enter pressed -- parse value
+                ParseRateTextBox();
+            }
+        }
+
+
+        //  Handler for file drag & drop over the window
+        private void Window_Drop(object sender, DragEventArgs e)
+        {
+            string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
+            // open 1st of the chosen files
+            OpenFile(files[0]);
+        }
+    }
+}