/// <summary>
/// Method for opening AV file through "Open" button.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void openFileButton_Click(object sender, RoutedEventArgs e)
{
audioFile = new OpenFile(this);
}
/// <summary>
/// Constructor for initializing silence cutting algorithm
/// </summary>
/// <param name="mainWindow">Current instance of MainWindow class</param>
/// <param name="audio_open">Current instance of OpenFile class</param>
public CutSilence(MainWindow mainWindow, OpenFile audio_open)
{
audio_open_file = audio_open;
_numberOfChannels = audio_open_file.getNumberOfChannels();
//ensure the lists have adequate number of channels - right dimension
for (short i = 0; i < _numberOfChannels; i++)
{
_samples.Add(new List <short>());
_buffer.Add(new List <short>());
_temporarySamplesValues.Add(0);
}
double buffer_slider = mainWindow.A_r_time_slider.Value; //Value from slider Attack/Release time
double attack_buffer = Math.Round(audio_open_file.getSampleRate() * (0.05 + buffer_slider * (5 / 7.0))); //Determines the number of samples to be checked when a sample below the threshold is detected. Prevents low value samples from being cut from a non-silent signal
int release_buffer = (int)Math.Round(audio_open_file.getSampleRate() * (0.02 + buffer_slider * (2 / 7.0))); //Determines the number od samples to be saved before a sample above the treshold is detected during silence cutting. Protects against too aggressive starting of the sound
double treshold_slider = mainWindow.Threshold_slider.Value;
int threshold = 500 + (int)Math.Round(treshold_slider); //ZROBIĆ W ZALEŻNOŚCI OD OTRZYMANYCH WARTOŚCI
double attack_smooth_silencing = attack_buffer - Math.Round(audio_open_file.getSampleRate() * 0.01); //Determines the length of the signal where slow muting of samples will be performed. In this case 10ms.
double release_smooth_silencing = Math.Round(audio_open_file.getSampleRate() * 0.01); //Determines the length of the signal where slow unmuting of samples will be performed. In this case 10ms.
for (int i = 0; i < (int)audio_open_file.getTotalSamplesNumber(); i++)
{
if (i == progress_counter * (((int)audio_open_file.getTotalSamplesNumber()) / 200)) //part of the program responsible for progress bar loading.
{
//A workaround for working status bar; Call it AS RARELY AS POSSIBLE as this kind of dispatcher hurts application's performance.
//I suggest calling this part of code 50 times during whole convertion process; It will be enough to show the progress and it won't hurt the performance as well.
mainWindow.Dispatcher.Invoke((Action)(() => { mainWindow.progress_bar.Value += 1; }), System.Windows.Threading.DispatcherPriority.ApplicationIdle);
progress_counter++;
}
bool above_threshold = false;
for (short j = 0; j < _numberOfChannels; j++) //Saving one sample for each channel in a given iteration of the loop
{
_temporarySamplesValues[j] = audio_open_file.getSampleValue(i, j);
}
for (short j = 0; j < _temporarySamplesValues.Count(); j++)
{
if (_temporarySamplesValues[j] >= threshold) //Checking if at least one sample for any channel exceeds the set threshold. If found, look no further
{
above_threshold = true;
break;
}
}
if (!above_threshold && sound) //Status update if a sample below the specified threshold is detected in the sound
{
sound = false;
silence_verification = true;
}
if (sound) //First part - save samples if it's a sound
{
saving_samples(i);
}
if (silence_verification) //Second part - checking if silence is detected
{
if (buffer_counter > attack_smooth_silencing && buffer_counter < attack_buffer) //Part of the program responsible for smooth silencing of samples at the end of buffer. The silencing time is 10ms
{
buffer_counter++;
smooth_silencing_counter++;
for (short j = 0; j < _numberOfChannels; j++)
{
_samples[j].Add((short)(audio_open_file.getSampleValue(i, j) * ((attack_buffer - attack_smooth_silencing - smooth_silencing_counter) / (attack_buffer - attack_smooth_silencing))));
}
}
else
{
saving_samples(i);
buffer_counter++;
}
if (above_threshold) //If any sample with a value exceeding the threshold is found, go back to the first part
{
sound = true;
silence_verification = false;
smooth_silencing_counter = 0;
buffer_counter = 0;
}
if (buffer_counter == attack_buffer && silence_verification) //If all samples in the buffer were below the threshold go to third part. Silence verification is
{ //needed to rule out situations in which the last attempt in the buffer exceeds the threshold. Eliminate a situation where both ifs are true
silence_cutting = true;
silence_verification = false;
buffer_counter = 0;
smooth_silencing_counter = 0;
}
}
if (silence_cutting) //Third part - cutting silence from the signal.
{
for (short j = 0; j < _numberOfChannels; j++)
{
_buffer[j].Add(audio_open_file.getSampleValue(i, j)); //Adding sample values to the buffer that is responsible for release time
}
if (release_counter < release_buffer) //Defining size of buffer
{
release_counter++;
}
else
{
for (short j = 0; j < _numberOfChannels; j++)
{
_buffer[j].RemoveAt(0); //Removing the oldest samples
}
}
if (above_threshold) //The sample value has exceeded the threshold //uwazac bo czasami nie zdazy sie zapelnic cały bufor
{
if (release_counter == release_buffer) //checking if the buffer has been completely full
{
for (int k = 0; k < release_smooth_silencing; k++)
{
for (short j = 0; j < _numberOfChannels; j++)
{
_buffer[j][k] = (short)(_buffer[j][k] * (k / release_smooth_silencing)); //Adding samples with progressively larger values to achieve smooth transition
}
}
}
for (short j = 0; j < _numberOfChannels; j++)
{
_samples[j].AddRange(_buffer[j]); //Adding samples that are included in the release time
}
release_counter = 0; //Preparing the counter and buffers for re-operation
for (short j = 0; j < _numberOfChannels; j++)
{
_buffer[j].Clear();
}
silence_cutting = false;
sound = true;
}
}
}
//int[] array = samples_first_channel.ToArray();
//samples_first_channel.Clear();
//TRZEBA BEDZIE CZYŚCIĆ BUFORY (buffer_first_channel.Clear(); buffer_second_channel.Clear();) NA WSZELKI WYPADEK JAKBY DZIAŁANIE PROGRAMU ZAKOŃCZYŁA SIE W POŁOWIE ORAZ BY PRZYGOTOWAĆ PROGRAM DO CZYSZCZENIA KOLEJNEGO PLIKU!!!!!!!! PRAWDOPODOBNIE NA WYJSCIU FORA
//BĘDZIE TRZEBA DODAĆ PRZYPISYWANIE LISTY DO DANEJ TABLICY ORAZ WYKONAĆ CZYSZCZENIE LISTY TAK BY KOLEJNE 10000 PRÓBEK ZAPISYWAŁO SIE OD NOWA (OSZCZĘDNOŚC PAMIĘCI)
//ZASTANOWAIĆ SIĘ CZY NIE BĘDZIE KONIECZNE WRZUCENIE NA KONIEC BOOLEANÓW TAK BY STATUSY DZIAŁAŁY POPRAWNIE NAWET JAK UŻYTKOWNIK NIE WYJDZIE Z PROGRAMU
}
/// <summary>
/// Method used for opening file through drag-drop procedure.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OpenFileGrid_Drop(object sender, DragEventArgs e)
{
string[] file = (string[])e.Data.GetData(DataFormats.FileDrop);
audioFile = new OpenFile(this, file[0]);
}
