// event. click on 'Cacher' boutton
private void cacherBtn_Click(object sender, EventArgs e)
{
// Désactivation du boutton 'Lire' du fichier audio de sortie + 'Extraction Rapide..'
playOutputBtn.Enabled = ExtractionRapideBtn.Enabled = false;
// remise à zéro de la barre de chargement
progressBar1.Value = 0;
// 1 - vérification du fichier audio d'entrée + la clé + le texte à cacher
if (audioFileTxtBox.Text == "")
{
MessageBox.Show("Aucun fichier audio choisi !", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
else if (cleTxtBox.Text == "")
{
MessageBox.Show("Aucune clé choisie !", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
else if (txtAcacherTab1.Text == "")
{
MessageBox.Show("Aucun texte à cacher !", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
// 2 - demande d'emplacement d'enregistrement du fichier audio de sortie
SaveFileDialog saveFileDialog1 = new SaveFileDialog();
saveFileDialog1.Title = "Enregistrer le fichier audio de sortie dans";
saveFileDialog1.DefaultExt = "wav";
saveFileDialog1.Filter = "audio files (*.wav)|*.wav";
if (saveFileDialog1.ShowDialog() == DialogResult.OK) // si emplacement choisi
{
// Let's hide the message/text !
// on commence le calcul du temp d'éxecution
Stopwatch sw = new Stopwatch();
sw.Start();
// create streams
Stream sourceStream = null;
FileStream destinationStream = null;
WaveStream audioStream = null;
// create a stream that contains the message, preceeded by its length
Stream messageStream = ToolsAndFunctions.stringToStream(txtAcacherTab1.Text);
// create a stream that contains the key
Stream keyStream = ToolsAndFunctions.stringToStream(cleTxtBox.Text);
long countSamplesRequired = 0; // var to count samples required (we use it in catch() so this is the best place)
try
{
//how man samples do we need?
countSamplesRequired = WaveUtility.CheckKeyForMessage(keyStream, messageStream.Length);
if (countSamplesRequired > Int32.MaxValue)
{
throw new Exception("Message too long, or bad key! This message/key combination requires " + countSamplesRequired + " samples, only " + Int32.MaxValue + " samples are allowed.");
}
// open source stream
sourceStream = new FileStream(audioFileTxtBox.Text, FileMode.Open);
// create destination stream
destinationStream = new FileStream(saveFileDialog1.FileName, FileMode.Create, FileAccess.Write);
//copy the carrier file's header
audioStream = new WaveStream(sourceStream, destinationStream);
if (audioStream.Length <= 0)
{
throw new Exception("Invalid WAV file");
}
//are there enough samples in the carrier wave?
if (countSamplesRequired > audioStream.CountSamples)
{
String errorReport = "The carrier file is too small for this message and key!\r\n"
+ "Samples available: " + audioStream.CountSamples + "\r\n"
+ "Samples needed: " + countSamplesRequired + "\r\n\r\n"
+ "\tOuvrir la fenêtre d'enregistrement audio ?";
throw new Exception(errorReport);
}
//hide the message
this.Cursor = Cursors.WaitCursor;
WaveUtility utility = new WaveUtility(audioStream, destinationStream);
utility.Hide(messageStream, keyStream);
// set output audio file path
outputAudioTxtBox.Text = saveFileDialog1.FileName;
// on arrête le calcul du temp d'éxecution + on l'affiche
sw.Stop();
execTime.Text = sw.ElapsedMilliseconds.ToString() + " ms";
// activate 'Lire' boutton + 'Extraction Rapide..'
playOutputBtn.Enabled = ExtractionRapideBtn.Enabled = true;
// chargement complet de la barre de chargement
progressBar1.Value = 100;
}
catch (Exception ex)
{
//this.Cursor = Cursors.Default;
// if Message contains "Samples needed" , mean that wav file is not enought
if (ex.Message.Contains("Samples needed"))
{
if (MessageBox.Show(ex.Message, "Erreur", MessageBoxButtons.YesNo, MessageBoxIcon.Stop) == System.Windows.Forms.DialogResult.Yes)
{
Form fen = new RecordSound(countSamplesRequired);
fen.ShowDialog();
}
}
else
{
MessageBox.Show(ex.Message, "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
}
finally
{
if (keyStream != null)
{
keyStream.Close();
}
if (messageStream != null)
{
messageStream.Close();
}
if (audioStream != null)
{
audioStream.Close();
}
if (sourceStream != null)
{
sourceStream.Close();
}
if (destinationStream != null)
{
destinationStream.Close();
}
this.Cursor = Cursors.Default;
if (sw.IsRunning)
{
sw.Stop();
}
} // fin try
} // fin if
}
// event. click on 'Extraire' boutton
private void extraireBtn_Click(object sender, EventArgs e)
{
// vidage de la zone qui contiendra le message caché
txtCacherTab2.Text = "";
// remise à zéro de la barre de chargement
progressBar1.Value = 0;
// 1 - vérification du fichier audio d'entrée + la clé
if (audioFileTxtBox.Text == "")
{
MessageBox.Show("Aucun fichier audio choisi !", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
else if (cleTxtBox.Text == "")
{
MessageBox.Show("Aucune clé choisie !", "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
// Let's Extract the message !
// on commence le calcul du temp d'éxecution
Stopwatch sw = new Stopwatch();
sw.Start();
// create streams
FileStream sourceStream = null;
WaveStream audioStream = null;
//create an empty stream to receive the extracted message
MemoryStream messageStream = new MemoryStream();
// create a stream that contains the key
Stream keyStream = ToolsAndFunctions.stringToStream(cleTxtBox.Text);
try
{
//open the carrier file
sourceStream = new FileStream(audioFileTxtBox.Text, FileMode.Open);
audioStream = new WaveStream(sourceStream);
WaveUtility utility = new WaveUtility(audioStream);
//exctract the message from the carrier wave
this.Cursor = Cursors.WaitCursor;
Thread thread = new Thread(() => { utility.Extract(messageStream, keyStream); });
thread.Start();
int timeout = (int)TimeoutNumericUpDown.Value * 1000; // conversion en milliseconde
if (!thread.Join(timeout)) // if timeout
{
thread.Abort();
throw new Exception("[Timeout !]\r\nIl est probable que le fichier audio ou que la clé soit erronée !");
}
// show message
if (messageStream.Length > 0)
{
messageStream.Seek(0, SeekOrigin.Begin);
txtCacherTab2.Text = new StreamReader(messageStream).ReadToEnd();
}
// on arrête le calcul du temp d'éxecution + on l'affiche
sw.Stop();
execTime.Text = sw.ElapsedMilliseconds.ToString() + " ms";
// chargement complet de la barre de chargement
progressBar1.Value = 100;
}
catch (Exception ex)
{
//this.Cursor = Cursors.Default;
MessageBox.Show(ex.Message, "Erreur", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
finally
{
if (keyStream != null)
{
keyStream.Close();
}
if (messageStream != null)
{
messageStream.Close();
}
if (audioStream != null)
{
audioStream.Close();
}
if (sourceStream != null)
{
sourceStream.Close();
}
this.Cursor = Cursors.Default;
if (sw.IsRunning)
{
sw.Stop();
}
}
}